Adding upstream version 2:9.0.1378.upstream/2%9.0.1378upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 8637 insertions, 0 deletions

diff --git a/src/quickfix.c b/src/quickfix.c
new file mode 100644
index 0000000..63dd541
--- /dev/null
+++ b/src/quickfix.c
@@ -0,0 +1,8637 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * quickfix.c: functions for quickfix mode, using a file with error messages
+ */
+
+#include "vim.h"
+
+#if defined(FEAT_QUICKFIX) || defined(PROTO)
+
+struct dir_stack_T
+{
+    struct dir_stack_T	*next;
+    char_u		*dirname;
+};
+
+/*
+ * For each error the next struct is allocated and linked in a list.
+ */
+typedef struct qfline_S qfline_T;
+struct qfline_S
+{
+    qfline_T	*qf_next;	// pointer to next error in the list
+    qfline_T	*qf_prev;	// pointer to previous error in the list
+    linenr_T	qf_lnum;	// line number where the error occurred
+    linenr_T	qf_end_lnum;	// line number when the error has range or zero
+    int		qf_fnum;	// file number for the line
+    int		qf_col;		// column where the error occurred
+    int		qf_end_col;	// column when the error has range or zero
+    int		qf_nr;		// error number
+    char_u	*qf_module;	// module name for this error
+    char_u	*qf_pattern;	// search pattern for the error
+    char_u	*qf_text;	// description of the error
+    char_u	qf_viscol;	// set to TRUE if qf_col and qf_end_col is
+				// screen column
+    char_u	qf_cleared;	// set to TRUE if line has been deleted
+    char_u	qf_type;	// type of the error (mostly 'E'); 1 for
+				// :helpgrep
+    char_u	qf_valid;	// valid error message detected
+};
+
+/*
+ * There is a stack of error lists.
+ */
+#define LISTCOUNT   10
+#define INVALID_QFIDX (-1)
+#define INVALID_QFBUFNR (0)
+
+/*
+ * Quickfix list type.
+ */
+typedef enum
+{
+    QFLT_QUICKFIX, // Quickfix list - global list
+    QFLT_LOCATION, // Location list - per window list
+    QFLT_INTERNAL  // Internal - Temporary list used by getqflist()/getloclist()
+} qfltype_T;
+
+/*
+ * Quickfix/Location list definition
+ * Contains a list of entries (qfline_T). qf_start points to the first entry
+ * and qf_last points to the last entry. qf_count contains the list size.
+ *
+ * Usually the list contains one or more entries. But an empty list can be
+ * created using setqflist()/setloclist() with a title and/or user context
+ * information and entries can be added later using setqflist()/setloclist().
+ */
+typedef struct qf_list_S
+{
+    int_u	qf_id;		// Unique identifier for this list
+    qfltype_T	qfl_type;
+    qfline_T	*qf_start;	// pointer to the first error
+    qfline_T	*qf_last;	// pointer to the last error
+    qfline_T	*qf_ptr;	// pointer to the current error
+    int		qf_count;	// number of errors (0 means empty list)
+    int		qf_index;	// current index in the error list
+    int		qf_nonevalid;	// TRUE if not a single valid entry found
+    char_u	*qf_title;	// title derived from the command that created
+				// the error list or set by setqflist
+    typval_T	*qf_ctx;	// context set by setqflist/setloclist
+    callback_T  qf_qftf_cb;	// 'quickfixtextfunc' callback function
+
+    struct dir_stack_T	*qf_dir_stack;
+    char_u		*qf_directory;
+    struct dir_stack_T	*qf_file_stack;
+    char_u		*qf_currfile;
+    int			qf_multiline;
+    int			qf_multiignore;
+    int			qf_multiscan;
+    long		qf_changedtick;
+} qf_list_T;
+
+/*
+ * Quickfix/Location list stack definition
+ * Contains a list of quickfix/location lists (qf_list_T)
+ */
+struct qf_info_S
+{
+    // Count of references to this list. Used only for location lists.
+    // When a location list window reference this list, qf_refcount
+    // will be 2. Otherwise, qf_refcount will be 1. When qf_refcount
+    // reaches 0, the list is freed.
+    int		qf_refcount;
+    int		qf_listcount;	    // current number of lists
+    int		qf_curlist;	    // current error list
+    qf_list_T	qf_lists[LISTCOUNT];
+    qfltype_T	qfl_type;	    // type of list
+    int		qf_bufnr;	    // quickfix window buffer number
+};
+
+static qf_info_T ql_info;	// global quickfix list
+static int_u last_qf_id = 0;	// Last used quickfix list id
+
+#define FMT_PATTERNS 13		// maximum number of % recognized
+
+/*
+ * Structure used to hold the info of one part of 'errorformat'
+ */
+typedef struct efm_S efm_T;
+struct efm_S
+{
+    regprog_T	    *prog;	// pre-formatted part of 'errorformat'
+    efm_T	    *next;	// pointer to next (NULL if last)
+    char_u	    addr[FMT_PATTERNS]; // indices of used % patterns
+    char_u	    prefix;	// prefix of this format line:
+				//   'D' enter directory
+				//   'X' leave directory
+				//   'A' start of multi-line message
+				//   'E' error message
+				//   'W' warning message
+				//   'I' informational message
+				//   'N' note message
+				//   'C' continuation line
+				//   'Z' end of multi-line message
+				//   'G' general, unspecific message
+				//   'P' push file (partial) message
+				//   'Q' pop/quit file (partial) message
+				//   'O' overread (partial) message
+    char_u	    flags;	// additional flags given in prefix
+				//   '-' do not include this line
+				//   '+' include whole line in message
+    int		    conthere;	// %> used
+};
+
+// List of location lists to be deleted.
+// Used to delay the deletion of locations lists by autocmds.
+typedef struct qf_delq_S
+{
+    struct qf_delq_S	*next;
+    qf_info_T		*qi;
+} qf_delq_T;
+static qf_delq_T *qf_delq_head = NULL;
+
+// Counter to prevent autocmds from freeing up location lists when they are
+// still being used.
+static int	quickfix_busy = 0;
+
+static efm_T	*fmt_start = NULL; // cached across qf_parse_line() calls
+
+// callback function for 'quickfixtextfunc'
+static callback_T qftf_cb;
+
+static void	qf_new_list(qf_info_T *qi, char_u *qf_title);
+static int	qf_add_entry(qf_list_T *qfl, char_u *dir, char_u *fname, char_u *module, int bufnum, char_u *mesg, long lnum, long end_lnum, int col, int end_col, int vis_col, char_u *pattern, int nr, int type, int valid);
+static void	qf_free(qf_list_T *qfl);
+static char_u	*qf_types(int, int);
+static int	qf_get_fnum(qf_list_T *qfl, char_u *, char_u *);
+static char_u	*qf_push_dir(char_u *, struct dir_stack_T **, int is_file_stack);
+static char_u	*qf_pop_dir(struct dir_stack_T **);
+static char_u	*qf_guess_filepath(qf_list_T *qfl, char_u *);
+static void	qf_jump_newwin(qf_info_T *qi, int dir, int errornr, int forceit, int newwin);
+static void	qf_fmt_text(garray_T *gap, char_u *text);
+static void	qf_range_text(garray_T *gap, qfline_T *qfp);
+static int	qf_win_pos_update(qf_info_T *qi, int old_qf_index);
+static win_T	*qf_find_win(qf_info_T *qi);
+static buf_T	*qf_find_buf(qf_info_T *qi);
+static void	qf_update_buffer(qf_info_T *qi, qfline_T *old_last);
+static void	qf_fill_buffer(qf_list_T *qfl, buf_T *buf, qfline_T *old_last, int qf_winid);
+static buf_T	*load_dummy_buffer(char_u *fname, char_u *dirname_start, char_u *resulting_dir);
+static void	wipe_dummy_buffer(buf_T *buf, char_u *dirname_start);
+static void	unload_dummy_buffer(buf_T *buf, char_u *dirname_start);
+static qf_info_T *ll_get_or_alloc_list(win_T *);
+
+// Quickfix window check helper macro
+#define IS_QF_WINDOW(wp) (bt_quickfix((wp)->w_buffer) && (wp)->w_llist_ref == NULL)
+// Location list window check helper macro
+#define IS_LL_WINDOW(wp) (bt_quickfix((wp)->w_buffer) && (wp)->w_llist_ref != NULL)
+
+// Quickfix and location list stack check helper macros
+#define IS_QF_STACK(qi)		((qi)->qfl_type == QFLT_QUICKFIX)
+#define IS_LL_STACK(qi)		((qi)->qfl_type == QFLT_LOCATION)
+#define IS_QF_LIST(qfl)		((qfl)->qfl_type == QFLT_QUICKFIX)
+#define IS_LL_LIST(qfl)		((qfl)->qfl_type == QFLT_LOCATION)
+
+/*
+ * Return location list for window 'wp'
+ * For location list window, return the referenced location list
+ */
+#define GET_LOC_LIST(wp) (IS_LL_WINDOW(wp) ? (wp)->w_llist_ref : (wp)->w_llist)
+
+// Macro to loop through all the items in a quickfix list
+// Quickfix item index starts from 1, so i below starts at 1
+#define FOR_ALL_QFL_ITEMS(qfl, qfp, i) \
+		    for ((i) = 1, (qfp) = (qfl)->qf_start; \
+			    !got_int && (i) <= (qfl)->qf_count && (qfp) != NULL; \
+			    ++(i), (qfp) = (qfp)->qf_next)
+
+/*
+ * Looking up a buffer can be slow if there are many.  Remember the last one
+ * to make this a lot faster if there are multiple matches in the same file.
+ */
+static char_u   *qf_last_bufname = NULL;
+static bufref_T  qf_last_bufref = {NULL, 0, 0};
+
+static garray_T qfga;
+
+/*
+ * Get a growarray to buffer text in.  Shared between various commands to avoid
+ * many alloc/free calls.
+ */
+    static garray_T *
+qfga_get(void)
+{
+    static int initialized = FALSE;
+
+    if (!initialized)
+    {
+	initialized = TRUE;
+	ga_init2(&qfga, 1, 256);
+    }
+
+    // Reset the length to zero.  Retain ga_data from previous use to avoid
+    // many alloc/free calls.
+    qfga.ga_len = 0;
+
+    return &qfga;
+}
+
+/*
+ * The "qfga" grow array buffer is reused across multiple quickfix commands as
+ * a temporary buffer to reduce the number of alloc/free calls.  But if the
+ * buffer size is large, then to avoid holding on to that memory, clear the
+ * grow array.  Otherwise just reset the grow array length.
+ */
+    static void
+qfga_clear(void)
+{
+    if (qfga.ga_maxlen > 1000)
+	ga_clear(&qfga);
+    else
+	qfga.ga_len = 0;
+}
+
+/*
+ * Maximum number of bytes allowed per line while reading a errorfile.
+ */
+#define LINE_MAXLEN 4096
+
+/*
+ * Patterns used.  Keep in sync with qf_parse_fmt[].
+ */
+static struct fmtpattern
+{
+    char_u	convchar;
+    char	*pattern;
+} fmt_pat[FMT_PATTERNS] =
+    {
+	{'f', ".\\+"},	    // only used when at end
+	{'n', "\\d\\+"},	// 1
+	{'l', "\\d\\+"},	// 2
+	{'e', "\\d\\+"},	// 3
+	{'c', "\\d\\+"},	// 4
+	{'k', "\\d\\+"},	// 5
+	{'t', "."},		// 6
+#define FMT_PATTERN_M 7
+	{'m', ".\\+"},		// 7
+#define FMT_PATTERN_R 8
+	{'r', ".*"},		// 8
+	{'p', "[-	 .]*"},	// 9
+	{'v', "\\d\\+"},	// 10
+	{'s', ".\\+"},		// 11
+	{'o', ".\\+"}		// 12
+    };
+
+/*
+ * Convert an errorformat pattern to a regular expression pattern.
+ * See fmt_pat definition above for the list of supported patterns.  The
+ * pattern specifier is supplied in "efmpat".  The converted pattern is stored
+ * in "regpat".  Returns a pointer to the location after the pattern.
+ */
+    static char_u *
+efmpat_to_regpat(
+	char_u	*efmpat,
+	char_u	*regpat,
+	efm_T	*efminfo,
+	int	idx,
+	int	round)
+{
+    char_u	*srcptr;
+
+    if (efminfo->addr[idx])
+    {
+	// Each errorformat pattern can occur only once
+	semsg(_(e_too_many_chr_in_format_string), *efmpat);
+	return NULL;
+    }
+    if ((idx && idx < FMT_PATTERN_R
+		&& vim_strchr((char_u *)"DXOPQ", efminfo->prefix) != NULL)
+	    || (idx == FMT_PATTERN_R
+		&& vim_strchr((char_u *)"OPQ", efminfo->prefix) == NULL))
+    {
+	semsg(_(e_unexpected_chr_in_format_str), *efmpat);
+	return NULL;
+    }
+    efminfo->addr[idx] = (char_u)++round;
+    *regpat++ = '\\';
+    *regpat++ = '(';
+#ifdef BACKSLASH_IN_FILENAME
+    if (*efmpat == 'f')
+    {
+	// Also match "c:" in the file name, even when
+	// checking for a colon next: "%f:".
+	// "\%(\a:\)\="
+	STRCPY(regpat, "\\%(\\a:\\)\\=");
+	regpat += 10;
+    }
+#endif
+    if (*efmpat == 'f' && efmpat[1] != NUL)
+    {
+	if (efmpat[1] != '\\' && efmpat[1] != '%')
+	{
+	    // A file name may contain spaces, but this isn't
+	    // in "\f".  For "%f:%l:%m" there may be a ":" in
+	    // the file name.  Use ".\{-1,}x" instead (x is
+	    // the next character), the requirement that :999:
+	    // follows should work.
+	    STRCPY(regpat, ".\\{-1,}");
+	    regpat += 7;
+	}
+	else
+	{
+	    // File name followed by '\\' or '%': include as
+	    // many file name chars as possible.
+	    STRCPY(regpat, "\\f\\+");
+	    regpat += 4;
+	}
+    }
+    else
+    {
+	srcptr = (char_u *)fmt_pat[idx].pattern;
+	while ((*regpat = *srcptr++) != NUL)
+	    ++regpat;
+    }
+    *regpat++ = '\\';
+    *regpat++ = ')';
+
+    return regpat;
+}
+
+/*
+ * Convert a scanf like format in 'errorformat' to a regular expression.
+ * Returns a pointer to the location after the pattern.
+ */
+    static char_u *
+scanf_fmt_to_regpat(
+	char_u	**pefmp,
+	char_u	*efm,
+	int	len,
+	char_u	*regpat)
+{
+    char_u	*efmp = *pefmp;
+
+    if (*efmp == '[' || *efmp == '\\')
+    {
+	if ((*regpat++ = *efmp) == '[')	// %*[^a-z0-9] etc.
+	{
+	    if (efmp[1] == '^')
+		*regpat++ = *++efmp;
+	    if (efmp < efm + len)
+	    {
+		*regpat++ = *++efmp;	    // could be ']'
+		while (efmp < efm + len
+			&& (*regpat++ = *++efmp) != ']')
+		    // skip ;
+		if (efmp == efm + len)
+		{
+		    emsg(_(e_missing_rsb_in_format_string));
+		    return NULL;
+		}
+	    }
+	}
+	else if (efmp < efm + len)	// %*\D, %*\s etc.
+	    *regpat++ = *++efmp;
+	*regpat++ = '\\';
+	*regpat++ = '+';
+    }
+    else
+    {
+	// TODO: scanf()-like: %*ud, %*3c, %*f, ... ?
+	semsg(_(e_unsupported_chr_in_format_string), *efmp);
+	return NULL;
+    }
+
+    *pefmp = efmp;
+
+    return regpat;
+}
+
+/*
+ * Analyze/parse an errorformat prefix.
+ */
+    static char_u *
+efm_analyze_prefix(char_u *efmp, efm_T *efminfo)
+{
+    if (vim_strchr((char_u *)"+-", *efmp) != NULL)
+	efminfo->flags = *efmp++;
+    if (vim_strchr((char_u *)"DXAEWINCZGOPQ", *efmp) != NULL)
+	efminfo->prefix = *efmp;
+    else
+    {
+	semsg(_(e_invalid_chr_in_format_string_prefix), *efmp);
+	return NULL;
+    }
+
+    return efmp;
+}
+
+/*
+ * Converts a 'errorformat' string part in 'efm' to a regular expression
+ * pattern.  The resulting regex pattern is returned in "regpat". Additional
+ * information about the 'erroformat' pattern is returned in "fmt_ptr".
+ * Returns OK or FAIL.
+ */
+    static int
+efm_to_regpat(
+	char_u	*efm,
+	int	len,
+	efm_T	*fmt_ptr,
+	char_u	*regpat)
+{
+    char_u	*ptr;
+    char_u	*efmp;
+    int		round;
+    int		idx = 0;
+
+    // Build a regexp pattern for a 'errorformat' option part
+    ptr = regpat;
+    *ptr++ = '^';
+    round = 0;
+    for (efmp = efm; efmp < efm + len; ++efmp)
+    {
+	if (*efmp == '%')
+	{
+	    ++efmp;
+	    for (idx = 0; idx < FMT_PATTERNS; ++idx)
+		if (fmt_pat[idx].convchar == *efmp)
+		    break;
+	    if (idx < FMT_PATTERNS)
+	    {
+		ptr = efmpat_to_regpat(efmp, ptr, fmt_ptr, idx, round);
+		if (ptr == NULL)
+		    return FAIL;
+		round++;
+	    }
+	    else if (*efmp == '*')
+	    {
+		++efmp;
+		ptr = scanf_fmt_to_regpat(&efmp, efm, len, ptr);
+		if (ptr == NULL)
+		    return FAIL;
+	    }
+	    else if (vim_strchr((char_u *)"%\\.^$~[", *efmp) != NULL)
+		*ptr++ = *efmp;		// regexp magic characters
+	    else if (*efmp == '#')
+		*ptr++ = '*';
+	    else if (*efmp == '>')
+		fmt_ptr->conthere = TRUE;
+	    else if (efmp == efm + 1)		// analyse prefix
+	    {
+		// prefix is allowed only at the beginning of the errorformat
+		// option part
+		efmp = efm_analyze_prefix(efmp, fmt_ptr);
+		if (efmp == NULL)
+		    return FAIL;
+	    }
+	    else
+	    {
+		semsg(_(e_invalid_chr_in_format_string), *efmp);
+		return FAIL;
+	    }
+	}
+	else			// copy normal character
+	{
+	    if (*efmp == '\\' && efmp + 1 < efm + len)
+		++efmp;
+	    else if (vim_strchr((char_u *)".*^$~[", *efmp) != NULL)
+		*ptr++ = '\\';	// escape regexp atoms
+	    if (*efmp)
+		*ptr++ = *efmp;
+	}
+    }
+    *ptr++ = '$';
+    *ptr = NUL;
+
+    return OK;
+}
+
+/*
+ * Free the 'errorformat' information list
+ */
+    static void
+free_efm_list(efm_T **efm_first)
+{
+    efm_T *efm_ptr;
+
+    for (efm_ptr = *efm_first; efm_ptr != NULL; efm_ptr = *efm_first)
+    {
+	*efm_first = efm_ptr->next;
+	vim_regfree(efm_ptr->prog);
+	vim_free(efm_ptr);
+    }
+    fmt_start = NULL;
+}
+
+/*
+ * Compute the size of the buffer used to convert a 'errorformat' pattern into
+ * a regular expression pattern.
+ */
+    static int
+efm_regpat_bufsz(char_u *efm)
+{
+    int sz;
+    int i;
+
+    sz = (FMT_PATTERNS * 3) + ((int)STRLEN(efm) << 2);
+    for (i = FMT_PATTERNS; i > 0; )
+	sz += (int)STRLEN(fmt_pat[--i].pattern);
+#ifdef BACKSLASH_IN_FILENAME
+    sz += 12; // "%f" can become twelve chars longer (see efm_to_regpat)
+#else
+    sz += 2; // "%f" can become two chars longer
+#endif
+
+    return sz;
+}
+
+/*
+ * Return the length of a 'errorformat' option part (separated by ",").
+ */
+    static int
+efm_option_part_len(char_u *efm)
+{
+    int len;
+
+    for (len = 0; efm[len] != NUL && efm[len] != ','; ++len)
+	if (efm[len] == '\\' && efm[len + 1] != NUL)
+	    ++len;
+
+    return len;
+}
+
+/*
+ * Parse the 'errorformat' option. Multiple parts in the 'errorformat' option
+ * are parsed and converted to regular expressions. Returns information about
+ * the parsed 'errorformat' option.
+ */
+    static efm_T *
+parse_efm_option(char_u *efm)
+{
+    efm_T	*fmt_ptr = NULL;
+    efm_T	*fmt_first = NULL;
+    efm_T	*fmt_last = NULL;
+    char_u	*fmtstr = NULL;
+    int		len;
+    int		sz;
+
+    // Each part of the format string is copied and modified from errorformat
+    // to regex prog.  Only a few % characters are allowed.
+
+    // Get some space to modify the format string into.
+    sz = efm_regpat_bufsz(efm);
+    if ((fmtstr = alloc_id(sz, aid_qf_efm_fmtstr)) == NULL)
+	goto parse_efm_error;
+
+    while (efm[0] != NUL)
+    {
+	// Allocate a new eformat structure and put it at the end of the list
+	fmt_ptr = ALLOC_CLEAR_ONE_ID(efm_T, aid_qf_efm_fmtpart);
+	if (fmt_ptr == NULL)
+	    goto parse_efm_error;
+	if (fmt_first == NULL)	    // first one
+	    fmt_first = fmt_ptr;
+	else
+	    fmt_last->next = fmt_ptr;
+	fmt_last = fmt_ptr;
+
+	// Isolate one part in the 'errorformat' option
+	len = efm_option_part_len(efm);
+
+	if (efm_to_regpat(efm, len, fmt_ptr, fmtstr) == FAIL)
+	    goto parse_efm_error;
+	if ((fmt_ptr->prog = vim_regcomp(fmtstr, RE_MAGIC + RE_STRING)) == NULL)
+	    goto parse_efm_error;
+	// Advance to next part
+	efm = skip_to_option_part(efm + len);	// skip comma and spaces
+    }
+
+    if (fmt_first == NULL)	// nothing found
+	emsg(_(e_errorformat_contains_no_pattern));
+
+    goto parse_efm_end;
+
+parse_efm_error:
+    free_efm_list(&fmt_first);
+
+parse_efm_end:
+    vim_free(fmtstr);
+
+    return fmt_first;
+}
+
+enum {
+    QF_FAIL = 0,
+    QF_OK = 1,
+    QF_END_OF_INPUT = 2,
+    QF_NOMEM = 3,
+    QF_IGNORE_LINE = 4,
+    QF_MULTISCAN = 5,
+    QF_ABORT = 6
+};
+
+/*
+ * State information used to parse lines and add entries to a quickfix/location
+ * list.
+ */
+typedef struct {
+    char_u	*linebuf;
+    int		linelen;
+    char_u	*growbuf;
+    int		growbufsiz;
+    FILE	*fd;
+    typval_T	*tv;
+    char_u	*p_str;
+    listitem_T	*p_li;
+    buf_T	*buf;
+    linenr_T	buflnum;
+    linenr_T	lnumlast;
+    vimconv_T	vc;
+} qfstate_T;
+
+/*
+ * Allocate more memory for the line buffer used for parsing lines.
+ */
+    static char_u *
+qf_grow_linebuf(qfstate_T *state, int newsz)
+{
+    char_u	*p;
+
+    // If the line exceeds LINE_MAXLEN exclude the last
+    // byte since it's not a NL character.
+    state->linelen = newsz > LINE_MAXLEN ? LINE_MAXLEN - 1 : newsz;
+    if (state->growbuf == NULL)
+    {
+	state->growbuf = alloc_id(state->linelen + 1, aid_qf_linebuf);
+	if (state->growbuf == NULL)
+	    return NULL;
+	state->growbufsiz = state->linelen;
+    }
+    else if (state->linelen > state->growbufsiz)
+    {
+	if ((p = vim_realloc(state->growbuf, state->linelen + 1)) == NULL)
+	    return NULL;
+	state->growbuf = p;
+	state->growbufsiz = state->linelen;
+    }
+    return state->growbuf;
+}
+
+/*
+ * Get the next string (separated by newline) from state->p_str.
+ */
+    static int
+qf_get_next_str_line(qfstate_T *state)
+{
+    // Get the next line from the supplied string
+    char_u	*p_str = state->p_str;
+    char_u	*p;
+    int		len;
+
+    if (*p_str == NUL) // Reached the end of the string
+	return QF_END_OF_INPUT;
+
+    p = vim_strchr(p_str, '\n');
+    if (p != NULL)
+	len = (int)(p - p_str) + 1;
+    else
+	len = (int)STRLEN(p_str);
+
+    if (len > IOSIZE - 2)
+    {
+	state->linebuf = qf_grow_linebuf(state, len);
+	if (state->linebuf == NULL)
+	    return QF_NOMEM;
+    }
+    else
+    {
+	state->linebuf = IObuff;
+	state->linelen = len;
+    }
+    vim_strncpy(state->linebuf, p_str, state->linelen);
+
+    // Increment using len in order to discard the rest of the
+    // line if it exceeds LINE_MAXLEN.
+    p_str += len;
+    state->p_str = p_str;
+
+    return QF_OK;
+}
+
+/*
+ * Get the next string from the List item state->p_li.
+ */
+    static int
+qf_get_next_list_line(qfstate_T *state)
+{
+    listitem_T	*p_li = state->p_li;
+    int		len;
+
+    while (p_li != NULL
+	    && (p_li->li_tv.v_type != VAR_STRING
+		|| p_li->li_tv.vval.v_string == NULL))
+	p_li = p_li->li_next;	// Skip non-string items
+
+    if (p_li == NULL)		// End of the list
+    {
+	state->p_li = NULL;
+	return QF_END_OF_INPUT;
+    }
+
+    len = (int)STRLEN(p_li->li_tv.vval.v_string);
+    if (len > IOSIZE - 2)
+    {
+	state->linebuf = qf_grow_linebuf(state, len);
+	if (state->linebuf == NULL)
+	    return QF_NOMEM;
+    }
+    else
+    {
+	state->linebuf = IObuff;
+	state->linelen = len;
+    }
+
+    vim_strncpy(state->linebuf, p_li->li_tv.vval.v_string, state->linelen);
+
+    state->p_li = p_li->li_next;	// next item
+    return QF_OK;
+}
+
+/*
+ * Get the next string from state->buf.
+ */
+    static int
+qf_get_next_buf_line(qfstate_T *state)
+{
+    char_u	*p_buf = NULL;
+    int		len;
+
+    // Get the next line from the supplied buffer
+    if (state->buflnum > state->lnumlast)
+	return QF_END_OF_INPUT;
+
+    p_buf = ml_get_buf(state->buf, state->buflnum, FALSE);
+    state->buflnum += 1;
+
+    len = (int)STRLEN(p_buf);
+    if (len > IOSIZE - 2)
+    {
+	state->linebuf = qf_grow_linebuf(state, len);
+	if (state->linebuf == NULL)
+	    return QF_NOMEM;
+    }
+    else
+    {
+	state->linebuf = IObuff;
+	state->linelen = len;
+    }
+    vim_strncpy(state->linebuf, p_buf, state->linelen);
+
+    return QF_OK;
+}
+
+/*
+ * Get the next string from file state->fd.
+ */
+    static int
+qf_get_next_file_line(qfstate_T *state)
+{
+    int	    discard;
+    int	    growbuflen;
+
+    if (fgets((char *)IObuff, IOSIZE, state->fd) == NULL)
+	return QF_END_OF_INPUT;
+
+    discard = FALSE;
+    state->linelen = (int)STRLEN(IObuff);
+    if (state->linelen == IOSIZE - 1 && !(IObuff[state->linelen - 1] == '\n'))
+    {
+	// The current line exceeds IObuff, continue reading using
+	// growbuf until EOL or LINE_MAXLEN bytes is read.
+	if (state->growbuf == NULL)
+	{
+	    state->growbufsiz = 2 * (IOSIZE - 1);
+	    state->growbuf = alloc_id(state->growbufsiz, aid_qf_linebuf);
+	    if (state->growbuf == NULL)
+		return QF_NOMEM;
+	}
+
+	// Copy the read part of the line, excluding null-terminator
+	memcpy(state->growbuf, IObuff, IOSIZE - 1);
+	growbuflen = state->linelen;
+
+	for (;;)
+	{
+	    char_u	*p;
+
+	    if (fgets((char *)state->growbuf + growbuflen,
+			state->growbufsiz - growbuflen, state->fd) == NULL)
+		break;
+	    state->linelen = (int)STRLEN(state->growbuf + growbuflen);
+	    growbuflen += state->linelen;
+	    if ((state->growbuf)[growbuflen - 1] == '\n')
+		break;
+	    if (state->growbufsiz == LINE_MAXLEN)
+	    {
+		discard = TRUE;
+		break;
+	    }
+
+	    state->growbufsiz = 2 * state->growbufsiz < LINE_MAXLEN
+		? 2 * state->growbufsiz : LINE_MAXLEN;
+	    if ((p = vim_realloc(state->growbuf, state->growbufsiz)) == NULL)
+		return QF_NOMEM;
+	    state->growbuf = p;
+	}
+
+	while (discard)
+	{
+	    // The current line is longer than LINE_MAXLEN, continue
+	    // reading but discard everything until EOL or EOF is
+	    // reached.
+	    if (fgets((char *)IObuff, IOSIZE, state->fd) == NULL
+		    || (int)STRLEN(IObuff) < IOSIZE - 1
+		    || IObuff[IOSIZE - 2] == '\n')
+		break;
+	}
+
+	state->linebuf = state->growbuf;
+	state->linelen = growbuflen;
+    }
+    else
+	state->linebuf = IObuff;
+
+    // Convert a line if it contains a non-ASCII character.
+    if (state->vc.vc_type != CONV_NONE && has_non_ascii(state->linebuf))
+    {
+	char_u	*line;
+
+	line = string_convert(&state->vc, state->linebuf, &state->linelen);
+	if (line != NULL)
+	{
+	    if (state->linelen < IOSIZE)
+	    {
+		STRCPY(state->linebuf, line);
+		vim_free(line);
+	    }
+	    else
+	    {
+		vim_free(state->growbuf);
+		state->linebuf = state->growbuf = line;
+		state->growbufsiz = state->linelen < LINE_MAXLEN
+						? state->linelen : LINE_MAXLEN;
+	    }
+	}
+    }
+
+    return QF_OK;
+}
+
+/*
+ * Get the next string from a file/buffer/list/string.
+ */
+    static int
+qf_get_nextline(qfstate_T *state)
+{
+    int status = QF_FAIL;
+
+    if (state->fd == NULL)
+    {
+	if (state->tv != NULL)
+	{
+	    if (state->tv->v_type == VAR_STRING)
+		// Get the next line from the supplied string
+		status = qf_get_next_str_line(state);
+	    else if (state->tv->v_type == VAR_LIST)
+		// Get the next line from the supplied list
+		status = qf_get_next_list_line(state);
+	}
+	else
+	    // Get the next line from the supplied buffer
+	    status = qf_get_next_buf_line(state);
+    }
+    else
+	// Get the next line from the supplied file
+	status = qf_get_next_file_line(state);
+
+    if (status != QF_OK)
+	return status;
+
+    // remove newline/CR from the line
+    if (state->linelen > 0 && state->linebuf[state->linelen - 1] == '\n')
+    {
+	state->linebuf[state->linelen - 1] = NUL;
+#ifdef USE_CRNL
+	if (state->linelen > 1 && state->linebuf[state->linelen - 2] == '\r')
+	    state->linebuf[state->linelen - 2] = NUL;
+#endif
+    }
+
+    remove_bom(state->linebuf);
+
+    return QF_OK;
+}
+
+typedef struct {
+    char_u	*namebuf;
+    char_u	*module;
+    char_u	*errmsg;
+    int		errmsglen;
+    long	lnum;
+    long	end_lnum;
+    int		col;
+    int		end_col;
+    char_u	use_viscol;
+    char_u	*pattern;
+    int		enr;
+    int		type;
+    int		valid;
+} qffields_T;
+
+/*
+ * Parse the match for filename ('%f') pattern in regmatch.
+ * Return the matched value in "fields->namebuf".
+ */
+    static int
+qf_parse_fmt_f(regmatch_T *rmp, int midx, qffields_T *fields, int prefix)
+{
+    int c;
+
+    if (rmp->startp[midx] == NULL || rmp->endp[midx] == NULL)
+	return QF_FAIL;
+
+    // Expand ~/file and $HOME/file to full path.
+    c = *rmp->endp[midx];
+    *rmp->endp[midx] = NUL;
+    expand_env(rmp->startp[midx], fields->namebuf, CMDBUFFSIZE);
+    *rmp->endp[midx] = c;
+
+    // For separate filename patterns (%O, %P and %Q), the specified file
+    // should exist.
+    if (vim_strchr((char_u *)"OPQ", prefix) != NULL
+	    && mch_getperm(fields->namebuf) == -1)
+	return QF_FAIL;
+
+    return QF_OK;
+}
+
+/*
+ * Parse the match for error number ('%n') pattern in regmatch.
+ * Return the matched value in "fields->enr".
+ */
+    static int
+qf_parse_fmt_n(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    fields->enr = (int)atol((char *)rmp->startp[midx]);
+    return QF_OK;
+}
+
+/*
+ * Parse the match for line number ('%l') pattern in regmatch.
+ * Return the matched value in "fields->lnum".
+ */
+    static int
+qf_parse_fmt_l(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    fields->lnum = atol((char *)rmp->startp[midx]);
+    return QF_OK;
+}
+
+/*
+ * Parse the match for end line number ('%e') pattern in regmatch.
+ * Return the matched value in "fields->end_lnum".
+ */
+    static int
+qf_parse_fmt_e(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    fields->end_lnum = atol((char *)rmp->startp[midx]);
+    return QF_OK;
+}
+
+/*
+ * Parse the match for column number ('%c') pattern in regmatch.
+ * Return the matched value in "fields->col".
+ */
+    static int
+qf_parse_fmt_c(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    fields->col = (int)atol((char *)rmp->startp[midx]);
+    return QF_OK;
+}
+
+/*
+ * Parse the match for end column number ('%k') pattern in regmatch.
+ * Return the matched value in "fields->end_col".
+ */
+    static int
+qf_parse_fmt_k(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    fields->end_col = (int)atol((char *)rmp->startp[midx]);
+    return QF_OK;
+}
+
+/*
+ * Parse the match for error type ('%t') pattern in regmatch.
+ * Return the matched value in "fields->type".
+ */
+    static int
+qf_parse_fmt_t(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    fields->type = *rmp->startp[midx];
+    return QF_OK;
+}
+
+/*
+ * Copy a non-error line into the error string.  Return the matched line in
+ * "fields->errmsg".
+ */
+    static int
+copy_nonerror_line(char_u *linebuf, int linelen, qffields_T *fields)
+{
+    char_u	*p;
+
+    if (linelen >= fields->errmsglen)
+    {
+	// linelen + null terminator
+	if ((p = vim_realloc(fields->errmsg, linelen + 1)) == NULL)
+	    return QF_NOMEM;
+	fields->errmsg = p;
+	fields->errmsglen = linelen + 1;
+    }
+    // copy whole line to error message
+    vim_strncpy(fields->errmsg, linebuf, linelen);
+
+    return QF_OK;
+}
+
+/*
+ * Parse the match for error message ('%m') pattern in regmatch.
+ * Return the matched value in "fields->errmsg".
+ */
+    static int
+qf_parse_fmt_m(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    char_u	*p;
+    int		len;
+
+    if (rmp->startp[midx] == NULL || rmp->endp[midx] == NULL)
+	return QF_FAIL;
+    len = (int)(rmp->endp[midx] - rmp->startp[midx]);
+    if (len >= fields->errmsglen)
+    {
+	// len + null terminator
+	if ((p = vim_realloc(fields->errmsg, len + 1)) == NULL)
+	    return QF_NOMEM;
+	fields->errmsg = p;
+	fields->errmsglen = len + 1;
+    }
+    vim_strncpy(fields->errmsg, rmp->startp[midx], len);
+    return QF_OK;
+}
+
+/*
+ * Parse the match for rest of a single-line file message ('%r') pattern.
+ * Return the matched value in "tail".
+ */
+    static int
+qf_parse_fmt_r(regmatch_T *rmp, int midx, char_u **tail)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    *tail = rmp->startp[midx];
+    return QF_OK;
+}
+
+/*
+ * Parse the match for the pointer line ('%p') pattern in regmatch.
+ * Return the matched value in "fields->col".
+ */
+    static int
+qf_parse_fmt_p(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    char_u	*match_ptr;
+
+    if (rmp->startp[midx] == NULL || rmp->endp[midx] == NULL)
+	return QF_FAIL;
+    fields->col = 0;
+    for (match_ptr = rmp->startp[midx]; match_ptr != rmp->endp[midx];
+								++match_ptr)
+    {
+	++fields->col;
+	if (*match_ptr == TAB)
+	{
+	    fields->col += 7;
+	    fields->col -= fields->col % 8;
+	}
+    }
+    ++fields->col;
+    fields->use_viscol = TRUE;
+    return QF_OK;
+}
+
+/*
+ * Parse the match for the virtual column number ('%v') pattern in regmatch.
+ * Return the matched value in "fields->col".
+ */
+    static int
+qf_parse_fmt_v(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    if (rmp->startp[midx] == NULL)
+	return QF_FAIL;
+    fields->col = (int)atol((char *)rmp->startp[midx]);
+    fields->use_viscol = TRUE;
+    return QF_OK;
+}
+
+/*
+ * Parse the match for the search text ('%s') pattern in regmatch.
+ * Return the matched value in "fields->pattern".
+ */
+    static int
+qf_parse_fmt_s(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    int		len;
+
+    if (rmp->startp[midx] == NULL || rmp->endp[midx] == NULL)
+	return QF_FAIL;
+    len = (int)(rmp->endp[midx] - rmp->startp[midx]);
+    if (len > CMDBUFFSIZE - 5)
+	len = CMDBUFFSIZE - 5;
+    STRCPY(fields->pattern, "^\\V");
+    STRNCAT(fields->pattern, rmp->startp[midx], len);
+    fields->pattern[len + 3] = '\\';
+    fields->pattern[len + 4] = '$';
+    fields->pattern[len + 5] = NUL;
+    return QF_OK;
+}
+
+/*
+ * Parse the match for the module ('%o') pattern in regmatch.
+ * Return the matched value in "fields->module".
+ */
+    static int
+qf_parse_fmt_o(regmatch_T *rmp, int midx, qffields_T *fields)
+{
+    int		len;
+
+    if (rmp->startp[midx] == NULL || rmp->endp[midx] == NULL)
+	return QF_FAIL;
+    len = (int)(rmp->endp[midx] - rmp->startp[midx]);
+    if (len > CMDBUFFSIZE)
+	len = CMDBUFFSIZE;
+    STRNCAT(fields->module, rmp->startp[midx], len);
+    return QF_OK;
+}
+
+/*
+ * 'errorformat' format pattern parser functions.
+ * The '%f' and '%r' formats are parsed differently from other formats.
+ * See qf_parse_match() for details.
+ * Keep in sync with fmt_pat[].
+ */
+static int (*qf_parse_fmt[FMT_PATTERNS])(regmatch_T *, int, qffields_T *) =
+{
+    NULL, // %f
+    qf_parse_fmt_n,
+    qf_parse_fmt_l,
+    qf_parse_fmt_e,
+    qf_parse_fmt_c,
+    qf_parse_fmt_k,
+    qf_parse_fmt_t,
+    qf_parse_fmt_m,
+    NULL, // %r
+    qf_parse_fmt_p,
+    qf_parse_fmt_v,
+    qf_parse_fmt_s,
+    qf_parse_fmt_o
+};
+
+/*
+ * Parse the error format pattern matches in "regmatch" and set the values in
+ * "fields".  fmt_ptr contains the 'efm' format specifiers/prefixes that have a
+ * match.  Returns QF_OK if all the matches are successfully parsed. On
+ * failure, returns QF_FAIL or QF_NOMEM.
+ */
+    static int
+qf_parse_match(
+	char_u		*linebuf,
+	int		linelen,
+	efm_T		*fmt_ptr,
+	regmatch_T	*regmatch,
+	qffields_T	*fields,
+	int		qf_multiline,
+	int		qf_multiscan,
+	char_u		**tail)
+{
+    int		idx = fmt_ptr->prefix;
+    int		i;
+    int		midx;
+    int		status;
+
+    if ((idx == 'C' || idx == 'Z') && !qf_multiline)
+	return QF_FAIL;
+    if (vim_strchr((char_u *)"EWIN", idx) != NULL)
+	fields->type = idx;
+    else
+	fields->type = 0;
+
+    // Extract error message data from matched line.
+    // We check for an actual submatch, because "\[" and "\]" in
+    // the 'errorformat' may cause the wrong submatch to be used.
+    for (i = 0; i < FMT_PATTERNS; i++)
+    {
+	status = QF_OK;
+	midx = (int)fmt_ptr->addr[i];
+	if (i == 0 && midx > 0)				// %f
+	    status = qf_parse_fmt_f(regmatch, midx, fields, idx);
+	else if (i == FMT_PATTERN_M)
+	{
+	    if (fmt_ptr->flags == '+' && !qf_multiscan)	// %+
+		status = copy_nonerror_line(linebuf, linelen, fields);
+	    else if (midx > 0)				// %m
+		status = qf_parse_fmt_m(regmatch, midx, fields);
+	}
+	else if (i == FMT_PATTERN_R && midx > 0)	// %r
+	    status = qf_parse_fmt_r(regmatch, midx, tail);
+	else if (midx > 0)				// others
+	    status = (qf_parse_fmt[i])(regmatch, midx, fields);
+
+	if (status != QF_OK)
+	    return status;
+    }
+
+    return QF_OK;
+}
+
+/*
+ * Parse an error line in 'linebuf' using a single error format string in
+ * 'fmt_ptr->prog' and return the matching values in 'fields'.
+ * Returns QF_OK if the efm format matches completely and the fields are
+ * successfully copied. Otherwise returns QF_FAIL or QF_NOMEM.
+ */
+    static int
+qf_parse_get_fields(
+	char_u		*linebuf,
+	int		linelen,
+	efm_T		*fmt_ptr,
+	qffields_T	*fields,
+	int		qf_multiline,
+	int		qf_multiscan,
+	char_u		**tail)
+{
+    regmatch_T	regmatch;
+    int		status = QF_FAIL;
+    int		r;
+
+    if (qf_multiscan &&
+		vim_strchr((char_u *)"OPQ", fmt_ptr->prefix) == NULL)
+	return QF_FAIL;
+
+    fields->namebuf[0] = NUL;
+    fields->module[0] = NUL;
+    fields->pattern[0] = NUL;
+    if (!qf_multiscan)
+	fields->errmsg[0] = NUL;
+    fields->lnum = 0;
+    fields->end_lnum = 0;
+    fields->col = 0;
+    fields->end_col = 0;
+    fields->use_viscol = FALSE;
+    fields->enr = -1;
+    fields->type = 0;
+    *tail = NULL;
+
+    // Always ignore case when looking for a matching error.
+    regmatch.rm_ic = TRUE;
+    regmatch.regprog = fmt_ptr->prog;
+    r = vim_regexec(&regmatch, linebuf, (colnr_T)0);
+    fmt_ptr->prog = regmatch.regprog;
+    if (r)
+	status = qf_parse_match(linebuf, linelen, fmt_ptr, &regmatch,
+		fields, qf_multiline, qf_multiscan, tail);
+
+    return status;
+}
+
+/*
+ * Parse directory error format prefixes (%D and %X).
+ * Push and pop directories from the directory stack when scanning directory
+ * names.
+ */
+    static int
+qf_parse_dir_pfx(int idx, qffields_T *fields, qf_list_T *qfl)
+{
+    if (idx == 'D')				// enter directory
+    {
+	if (*fields->namebuf == NUL)
+	{
+	    emsg(_(e_missing_or_empty_directory_name));
+	    return QF_FAIL;
+	}
+	qfl->qf_directory =
+	    qf_push_dir(fields->namebuf, &qfl->qf_dir_stack, FALSE);
+	if (qfl->qf_directory == NULL)
+	    return QF_FAIL;
+    }
+    else if (idx == 'X')			// leave directory
+	qfl->qf_directory = qf_pop_dir(&qfl->qf_dir_stack);
+
+    return QF_OK;
+}
+
+/*
+ * Parse global file name error format prefixes (%O, %P and %Q).
+ */
+    static int
+qf_parse_file_pfx(
+	int idx,
+	qffields_T *fields,
+	qf_list_T *qfl,
+	char_u *tail)
+{
+    fields->valid = FALSE;
+    if (*fields->namebuf == NUL || mch_getperm(fields->namebuf) >= 0)
+    {
+	if (*fields->namebuf && idx == 'P')
+	    qfl->qf_currfile =
+		qf_push_dir(fields->namebuf, &qfl->qf_file_stack, TRUE);
+	else if (idx == 'Q')
+	    qfl->qf_currfile = qf_pop_dir(&qfl->qf_file_stack);
+	*fields->namebuf = NUL;
+	if (tail && *tail)
+	{
+	    STRMOVE(IObuff, skipwhite(tail));
+	    qfl->qf_multiscan = TRUE;
+	    return QF_MULTISCAN;
+	}
+    }
+
+    return QF_OK;
+}
+
+/*
+ * Parse a non-error line (a line which doesn't match any of the error
+ * format in 'efm').
+ */
+    static int
+qf_parse_line_nomatch(char_u *linebuf, int linelen, qffields_T *fields)
+{
+    fields->namebuf[0] = NUL;	// no match found, remove file name
+    fields->lnum = 0;		// don't jump to this line
+    fields->valid = FALSE;
+
+    return copy_nonerror_line(linebuf, linelen, fields);
+}
+
+/*
+ * Parse multi-line error format prefixes (%C and %Z)
+ */
+    static int
+qf_parse_multiline_pfx(
+	int idx,
+	qf_list_T *qfl,
+	qffields_T *fields)
+{
+    char_u		*ptr;
+    int			len;
+
+    if (!qfl->qf_multiignore)
+    {
+	qfline_T *qfprev = qfl->qf_last;
+
+	if (qfprev == NULL)
+	    return QF_FAIL;
+	if (*fields->errmsg && !qfl->qf_multiignore)
+	{
+	    len = (int)STRLEN(qfprev->qf_text);
+	    ptr = alloc_id(len + STRLEN(fields->errmsg) + 2,
+						aid_qf_multiline_pfx);
+	    if (ptr == NULL)
+		return QF_FAIL;
+	    STRCPY(ptr, qfprev->qf_text);
+	    vim_free(qfprev->qf_text);
+	    qfprev->qf_text = ptr;
+	    *(ptr += len) = '\n';
+	    STRCPY(++ptr, fields->errmsg);
+	}
+	if (qfprev->qf_nr == -1)
+	    qfprev->qf_nr = fields->enr;
+	if (vim_isprintc(fields->type) && !qfprev->qf_type)
+	    // only printable chars allowed
+	    qfprev->qf_type = fields->type;
+
+	if (!qfprev->qf_lnum)
+	    qfprev->qf_lnum = fields->lnum;
+	if (!qfprev->qf_end_lnum)
+	    qfprev->qf_end_lnum = fields->end_lnum;
+	if (!qfprev->qf_col)
+	{
+	    qfprev->qf_col = fields->col;
+	    qfprev->qf_viscol = fields->use_viscol;
+	}
+	if (!qfprev->qf_end_col)
+	    qfprev->qf_end_col = fields->end_col;
+	if (!qfprev->qf_fnum)
+	    qfprev->qf_fnum = qf_get_fnum(qfl,
+		    qfl->qf_directory,
+		    *fields->namebuf || qfl->qf_directory != NULL
+		    ? fields->namebuf
+		    : qfl->qf_currfile != NULL && fields->valid
+		    ? qfl->qf_currfile : 0);
+    }
+    if (idx == 'Z')
+	qfl->qf_multiline = qfl->qf_multiignore = FALSE;
+    line_breakcheck();
+
+    return QF_IGNORE_LINE;
+}
+
+/*
+ * Parse a line and get the quickfix fields.
+ * Return the QF_ status.
+ */
+    static int
+qf_parse_line(
+	qf_list_T	*qfl,
+	char_u		*linebuf,
+	int		linelen,
+	efm_T		*fmt_first,
+	qffields_T	*fields)
+{
+    efm_T		*fmt_ptr;
+    int			idx = 0;
+    char_u		*tail = NULL;
+    int			status;
+
+restofline:
+    // If there was no %> item start at the first pattern
+    if (fmt_start == NULL)
+	fmt_ptr = fmt_first;
+    else
+    {
+	// Otherwise start from the last used pattern
+	fmt_ptr = fmt_start;
+	fmt_start = NULL;
+    }
+
+    // Try to match each part of 'errorformat' until we find a complete
+    // match or no match.
+    fields->valid = TRUE;
+    for ( ; fmt_ptr != NULL; fmt_ptr = fmt_ptr->next)
+    {
+	idx = fmt_ptr->prefix;
+	status = qf_parse_get_fields(linebuf, linelen, fmt_ptr, fields,
+				qfl->qf_multiline, qfl->qf_multiscan, &tail);
+	if (status == QF_NOMEM)
+	    return status;
+	if (status == QF_OK)
+	    break;
+    }
+    qfl->qf_multiscan = FALSE;
+
+    if (fmt_ptr == NULL || idx == 'D' || idx == 'X')
+    {
+	if (fmt_ptr != NULL)
+	{
+	    // 'D' and 'X' directory specifiers
+	    status = qf_parse_dir_pfx(idx, fields, qfl);
+	    if (status != QF_OK)
+		return status;
+	}
+
+	status = qf_parse_line_nomatch(linebuf, linelen, fields);
+	if (status != QF_OK)
+	    return status;
+
+	if (fmt_ptr == NULL)
+	    qfl->qf_multiline = qfl->qf_multiignore = FALSE;
+    }
+    else if (fmt_ptr != NULL)
+    {
+	// honor %> item
+	if (fmt_ptr->conthere)
+	    fmt_start = fmt_ptr;
+
+	if (vim_strchr((char_u *)"AEWIN", idx) != NULL)
+	{
+	    qfl->qf_multiline = TRUE;	// start of a multi-line message
+	    qfl->qf_multiignore = FALSE;// reset continuation
+	}
+	else if (vim_strchr((char_u *)"CZ", idx) != NULL)
+	{				// continuation of multi-line msg
+	    status = qf_parse_multiline_pfx(idx, qfl, fields);
+	    if (status != QF_OK)
+		return status;
+	}
+	else if (vim_strchr((char_u *)"OPQ", idx) != NULL)
+	{				// global file names
+	    status = qf_parse_file_pfx(idx, fields, qfl, tail);
+	    if (status == QF_MULTISCAN)
+		goto restofline;
+	}
+	if (fmt_ptr->flags == '-')	// generally exclude this line
+	{
+	    if (qfl->qf_multiline)
+		// also exclude continuation lines
+		qfl->qf_multiignore = TRUE;
+	    return QF_IGNORE_LINE;
+	}
+    }
+
+    return QF_OK;
+}
+
+/*
+ * Returns TRUE if the specified quickfix/location stack is empty
+ */
+    static int
+qf_stack_empty(qf_info_T *qi)
+{
+    return qi == NULL || qi->qf_listcount <= 0;
+}
+
+/*
+ * Returns TRUE if the specified quickfix/location list is empty.
+ */
+    static int
+qf_list_empty(qf_list_T *qfl)
+{
+    return qfl == NULL || qfl->qf_count <= 0;
+}
+
+/*
+ * Returns TRUE if the specified quickfix/location list is not empty and
+ * has valid entries.
+ */
+    static int
+qf_list_has_valid_entries(qf_list_T *qfl)
+{
+    return !qf_list_empty(qfl) && !qfl->qf_nonevalid;
+}
+
+/*
+ * Return a pointer to a list in the specified quickfix stack
+ */
+    static qf_list_T *
+qf_get_list(qf_info_T *qi, int idx)
+{
+    return &qi->qf_lists[idx];
+}
+
+/*
+ * Allocate the fields used for parsing lines and populating a quickfix list.
+ */
+    static int
+qf_alloc_fields(qffields_T *pfields)
+{
+    pfields->namebuf = alloc_id(CMDBUFFSIZE + 1, aid_qf_namebuf);
+    pfields->module = alloc_id(CMDBUFFSIZE + 1, aid_qf_module);
+    pfields->errmsglen = CMDBUFFSIZE + 1;
+    pfields->errmsg = alloc_id(pfields->errmsglen, aid_qf_errmsg);
+    pfields->pattern = alloc_id(CMDBUFFSIZE + 1, aid_qf_pattern);
+    if (pfields->namebuf == NULL || pfields->errmsg == NULL
+		|| pfields->pattern == NULL || pfields->module == NULL)
+	return FAIL;
+
+    return OK;
+}
+
+/*
+ * Free the fields used for parsing lines and populating a quickfix list.
+ */
+    static void
+qf_free_fields(qffields_T *pfields)
+{
+    vim_free(pfields->namebuf);
+    vim_free(pfields->module);
+    vim_free(pfields->errmsg);
+    vim_free(pfields->pattern);
+}
+
+/*
+ * Setup the state information used for parsing lines and populating a
+ * quickfix list.
+ */
+    static int
+qf_setup_state(
+	qfstate_T	*pstate,
+	char_u		*enc,
+	char_u		*efile,
+	typval_T	*tv,
+	buf_T		*buf,
+	linenr_T	lnumfirst,
+	linenr_T	lnumlast)
+{
+    pstate->vc.vc_type = CONV_NONE;
+    if (enc != NULL && *enc != NUL)
+	convert_setup(&pstate->vc, enc, p_enc);
+
+    if (efile != NULL && (pstate->fd = mch_fopen((char *)efile, "r")) == NULL)
+    {
+	semsg(_(e_cant_open_errorfile_str), efile);
+	return FAIL;
+    }
+
+    if (tv != NULL)
+    {
+	if (tv->v_type == VAR_STRING)
+	    pstate->p_str = tv->vval.v_string;
+	else if (tv->v_type == VAR_LIST)
+	    pstate->p_li = tv->vval.v_list->lv_first;
+	pstate->tv = tv;
+    }
+    pstate->buf = buf;
+    pstate->buflnum = lnumfirst;
+    pstate->lnumlast = lnumlast;
+
+    return OK;
+}
+
+/*
+ * Cleanup the state information used for parsing lines and populating a
+ * quickfix list.
+ */
+    static void
+qf_cleanup_state(qfstate_T *pstate)
+{
+    if (pstate->fd != NULL)
+	fclose(pstate->fd);
+
+    vim_free(pstate->growbuf);
+    if (pstate->vc.vc_type != CONV_NONE)
+	convert_setup(&pstate->vc, NULL, NULL);
+}
+
+/*
+ * Process the next line from a file/buffer/list/string and add it
+ * to the quickfix list 'qfl'.
+ */
+    static int
+qf_init_process_nextline(
+	qf_list_T	*qfl,
+	efm_T		*fmt_first,
+	qfstate_T	*state,
+	qffields_T	*fields)
+{
+    int		    status;
+
+    // Get the next line from a file/buffer/list/string
+    status = qf_get_nextline(state);
+    if (status != QF_OK)
+	return status;
+
+    status = qf_parse_line(qfl, state->linebuf, state->linelen,
+	    fmt_first, fields);
+    if (status != QF_OK)
+	return status;
+
+    return qf_add_entry(qfl,
+		qfl->qf_directory,
+		(*fields->namebuf || qfl->qf_directory != NULL)
+		? fields->namebuf
+		: ((qfl->qf_currfile != NULL && fields->valid)
+		    ? qfl->qf_currfile : (char_u *)NULL),
+		fields->module,
+		0,
+		fields->errmsg,
+		fields->lnum,
+		fields->end_lnum,
+		fields->col,
+		fields->end_col,
+		fields->use_viscol,
+		fields->pattern,
+		fields->enr,
+		fields->type,
+		fields->valid);
+}
+
+/*
+ * Read the errorfile "efile" into memory, line by line, building the error
+ * list.
+ * Alternative: when "efile" is NULL read errors from buffer "buf".
+ * Alternative: when "tv" is not NULL get errors from the string or list.
+ * Always use 'errorformat' from "buf" if there is a local value.
+ * Then "lnumfirst" and "lnumlast" specify the range of lines to use.
+ * Set the title of the list to "qf_title".
+ * Return -1 for error, number of errors for success.
+ */
+    static int
+qf_init_ext(
+    qf_info_T	    *qi,
+    int		    qf_idx,
+    char_u	    *efile,
+    buf_T	    *buf,
+    typval_T	    *tv,
+    char_u	    *errorformat,
+    int		    newlist,		// TRUE: start a new error list
+    linenr_T	    lnumfirst,		// first line number to use
+    linenr_T	    lnumlast,		// last line number to use
+    char_u	    *qf_title,
+    char_u	    *enc)
+{
+    qf_list_T	    *qfl;
+    qfstate_T	    state;
+    qffields_T	    fields;
+    qfline_T	    *old_last = NULL;
+    int		    adding = FALSE;
+    static efm_T    *fmt_first = NULL;
+    char_u	    *efm;
+    static char_u   *last_efm = NULL;
+    int		    retval = -1;	// default: return error flag
+    int		    status;
+
+    // Do not used the cached buffer, it may have been wiped out.
+    VIM_CLEAR(qf_last_bufname);
+
+    CLEAR_FIELD(state);
+    CLEAR_FIELD(fields);
+    if ((qf_alloc_fields(&fields) == FAIL) ||
+		(qf_setup_state(&state, enc, efile, tv, buf,
+					lnumfirst, lnumlast) == FAIL))
+	goto qf_init_end;
+
+    if (newlist || qf_idx == qi->qf_listcount)
+    {
+	// make place for a new list
+	qf_new_list(qi, qf_title);
+	qf_idx = qi->qf_curlist;
+	qfl = qf_get_list(qi, qf_idx);
+    }
+    else
+    {
+	// Adding to existing list, use last entry.
+	adding = TRUE;
+	qfl = qf_get_list(qi, qf_idx);
+	if (!qf_list_empty(qfl))
+	    old_last = qfl->qf_last;
+    }
+
+    // Use the local value of 'errorformat' if it's set.
+    if (errorformat == p_efm && tv == NULL && *buf->b_p_efm != NUL)
+	efm = buf->b_p_efm;
+    else
+	efm = errorformat;
+
+    // If the errorformat didn't change between calls, then reuse the
+    // previously parsed values.
+    if (last_efm == NULL || (STRCMP(last_efm, efm) != 0))
+    {
+	// free the previously parsed data
+	VIM_CLEAR(last_efm);
+	free_efm_list(&fmt_first);
+
+	// parse the current 'efm'
+	fmt_first = parse_efm_option(efm);
+	if (fmt_first != NULL)
+	    last_efm = vim_strsave(efm);
+    }
+
+    if (fmt_first == NULL)	// nothing found
+	goto error2;
+
+    // got_int is reset here, because it was probably set when killing the
+    // ":make" command, but we still want to read the errorfile then.
+    got_int = FALSE;
+
+    // Read the lines in the error file one by one.
+    // Try to recognize one of the error formats in each line.
+    while (!got_int)
+    {
+	status = qf_init_process_nextline(qfl, fmt_first, &state, &fields);
+	if (status == QF_NOMEM)		// memory alloc failure
+	    goto qf_init_end;
+	if (status == QF_END_OF_INPUT)	// end of input
+	    break;
+	if (status == QF_FAIL)
+	    goto error2;
+
+	line_breakcheck();
+    }
+    if (state.fd == NULL || !ferror(state.fd))
+    {
+	if (qfl->qf_index == 0)
+	{
+	    // no valid entry found
+	    qfl->qf_ptr = qfl->qf_start;
+	    qfl->qf_index = 1;
+	    qfl->qf_nonevalid = TRUE;
+	}
+	else
+	{
+	    qfl->qf_nonevalid = FALSE;
+	    if (qfl->qf_ptr == NULL)
+		qfl->qf_ptr = qfl->qf_start;
+	}
+	// return number of matches
+	retval = qfl->qf_count;
+	goto qf_init_end;
+    }
+    emsg(_(e_error_while_reading_errorfile));
+error2:
+    if (!adding)
+    {
+	// Error when creating a new list. Free the new list
+	qf_free(qfl);
+	qi->qf_listcount--;
+	if (qi->qf_curlist > 0)
+	    --qi->qf_curlist;
+    }
+qf_init_end:
+    if (qf_idx == qi->qf_curlist)
+	qf_update_buffer(qi, old_last);
+    qf_cleanup_state(&state);
+    qf_free_fields(&fields);
+
+    return retval;
+}
+
+/*
+ * Read the errorfile "efile" into memory, line by line, building the error
+ * list. Set the error list's title to qf_title.
+ * Return -1 for error, number of errors for success.
+ */
+    int
+qf_init(win_T	    *wp,
+	char_u	    *efile,
+	char_u	    *errorformat,
+	int	    newlist,		// TRUE: start a new error list
+	char_u	    *qf_title,
+	char_u	    *enc)
+{
+    qf_info_T	    *qi = &ql_info;
+
+    if (wp != NULL)
+    {
+	qi = ll_get_or_alloc_list(wp);
+	if (qi == NULL)
+	    return FAIL;
+    }
+
+    return qf_init_ext(qi, qi->qf_curlist, efile, curbuf, NULL, errorformat,
+	    newlist, (linenr_T)0, (linenr_T)0, qf_title, enc);
+}
+
+/*
+ * Set the title of the specified quickfix list. Frees the previous title.
+ * Prepends ':' to the title.
+ */
+    static void
+qf_store_title(qf_list_T *qfl, char_u *title)
+{
+    VIM_CLEAR(qfl->qf_title);
+
+    if (title == NULL)
+	return;
+
+    char_u *p = alloc_id(STRLEN(title) + 2, aid_qf_title);
+
+    qfl->qf_title = p;
+    if (p != NULL)
+	STRCPY(p, title);
+}
+
+/*
+ * The title of a quickfix/location list is set, by default, to the command
+ * that created the quickfix list with the ":" prefix.
+ * Create a quickfix list title string by prepending ":" to a user command.
+ * Returns a pointer to a static buffer with the title.
+ */
+    static char_u *
+qf_cmdtitle(char_u *cmd)
+{
+    static char_u qftitle_str[IOSIZE];
+
+    vim_snprintf((char *)qftitle_str, IOSIZE, ":%s", (char *)cmd);
+    return qftitle_str;
+}
+
+/*
+ * Return a pointer to the current list in the specified quickfix stack
+ */
+    static qf_list_T *
+qf_get_curlist(qf_info_T *qi)
+{
+    return qf_get_list(qi, qi->qf_curlist);
+}
+
+/*
+ * Prepare for adding a new quickfix list. If the current list is in the
+ * middle of the stack, then all the following lists are freed and then
+ * the new list is added.
+ */
+    static void
+qf_new_list(qf_info_T *qi, char_u *qf_title)
+{
+    int		i;
+    qf_list_T	*qfl;
+
+    // If the current entry is not the last entry, delete entries beyond
+    // the current entry.  This makes it possible to browse in a tree-like
+    // way with ":grep".
+    while (qi->qf_listcount > qi->qf_curlist + 1)
+	qf_free(&qi->qf_lists[--qi->qf_listcount]);
+
+    // When the stack is full, remove to oldest entry
+    // Otherwise, add a new entry.
+    if (qi->qf_listcount == LISTCOUNT)
+    {
+	qf_free(&qi->qf_lists[0]);
+	for (i = 1; i < LISTCOUNT; ++i)
+	    qi->qf_lists[i - 1] = qi->qf_lists[i];
+	qi->qf_curlist = LISTCOUNT - 1;
+    }
+    else
+	qi->qf_curlist = qi->qf_listcount++;
+    qfl = qf_get_curlist(qi);
+    CLEAR_POINTER(qfl);
+    qf_store_title(qfl, qf_title);
+    qfl->qfl_type = qi->qfl_type;
+    qfl->qf_id = ++last_qf_id;
+}
+
+/*
+ * Queue location list stack delete request.
+ */
+    static void
+locstack_queue_delreq(qf_info_T *qi)
+{
+    qf_delq_T	*q;
+
+    q = ALLOC_ONE(qf_delq_T);
+    if (q == NULL)
+	return;
+
+    q->qi = qi;
+    q->next = qf_delq_head;
+    qf_delq_head = q;
+}
+
+/*
+ * Return the global quickfix stack window buffer number.
+ */
+    int
+qf_stack_get_bufnr(void)
+{
+    return ql_info.qf_bufnr;
+}
+
+/*
+ * Wipe the quickfix window buffer (if present) for the specified
+ * quickfix/location list.
+ */
+    static void
+wipe_qf_buffer(qf_info_T *qi)
+{
+    buf_T	*qfbuf;
+
+    if (qi->qf_bufnr == INVALID_QFBUFNR)
+	return;
+
+    qfbuf = buflist_findnr(qi->qf_bufnr);
+    if (qfbuf != NULL && qfbuf->b_nwindows == 0)
+    {
+	// If the quickfix buffer is not loaded in any window, then
+	// wipe the buffer.
+	close_buffer(NULL, qfbuf, DOBUF_WIPE, FALSE, FALSE);
+	qi->qf_bufnr = INVALID_QFBUFNR;
+    }
+}
+
+/*
+ * Free a location list stack
+ */
+    static void
+ll_free_all(qf_info_T **pqi)
+{
+    int		i;
+    qf_info_T	*qi;
+
+    qi = *pqi;
+    if (qi == NULL)
+	return;
+    *pqi = NULL;	// Remove reference to this list
+
+    // If the location list is still in use, then queue the delete request
+    // to be processed later.
+    if (quickfix_busy > 0)
+    {
+	locstack_queue_delreq(qi);
+	return;
+    }
+
+    qi->qf_refcount--;
+    if (qi->qf_refcount < 1)
+    {
+	// No references to this location list.
+	// If the quickfix window buffer is loaded, then wipe it
+	wipe_qf_buffer(qi);
+
+	for (i = 0; i < qi->qf_listcount; ++i)
+	    qf_free(qf_get_list(qi, i));
+	vim_free(qi);
+    }
+}
+
+/*
+ * Free all the quickfix/location lists in the stack.
+ */
+    void
+qf_free_all(win_T *wp)
+{
+    int		i;
+    qf_info_T	*qi = &ql_info;
+
+    if (wp != NULL)
+    {
+	// location list
+	ll_free_all(&wp->w_llist);
+	ll_free_all(&wp->w_llist_ref);
+    }
+    else
+	// quickfix list
+	for (i = 0; i < qi->qf_listcount; ++i)
+	    qf_free(qf_get_list(qi, i));
+}
+
+/*
+ * Delay freeing of location list stacks when the quickfix code is running.
+ * Used to avoid problems with autocmds freeing location list stacks when the
+ * quickfix code is still referencing the stack.
+ * Must always call decr_quickfix_busy() exactly once after this.
+ */
+    static void
+incr_quickfix_busy(void)
+{
+    quickfix_busy++;
+}
+
+/*
+ * Safe to free location list stacks. Process any delayed delete requests.
+ */
+    static void
+decr_quickfix_busy(void)
+{
+    if (--quickfix_busy == 0)
+    {
+	// No longer referencing the location lists. Process all the pending
+	// delete requests.
+	while (qf_delq_head != NULL)
+	{
+	    qf_delq_T	*q = qf_delq_head;
+
+	    qf_delq_head = q->next;
+	    ll_free_all(&q->qi);
+	    vim_free(q);
+	}
+    }
+#ifdef ABORT_ON_INTERNAL_ERROR
+    if (quickfix_busy < 0)
+    {
+	emsg("quickfix_busy has become negative");
+	abort();
+    }
+#endif
+}
+
+#if defined(EXITFREE) || defined(PROTO)
+    void
+check_quickfix_busy(void)
+{
+    if (quickfix_busy != 0)
+    {
+	semsg("quickfix_busy not zero on exit: %ld", (long)quickfix_busy);
+# ifdef ABORT_ON_INTERNAL_ERROR
+	abort();
+# endif
+    }
+}
+#endif
+
+/*
+ * Add an entry to the end of the list of errors.
+ * Returns QF_OK on success or QF_FAIL on a memory allocation failure.
+ */
+    static int
+qf_add_entry(
+    qf_list_T	*qfl,		// quickfix list entry
+    char_u	*dir,		// optional directory name
+    char_u	*fname,		// file name or NULL
+    char_u	*module,	// module name or NULL
+    int		bufnum,		// buffer number or zero
+    char_u	*mesg,		// message
+    long	lnum,		// line number
+    long	end_lnum,	// line number for end
+    int		col,		// column
+    int		end_col,	// column for end
+    int		vis_col,	// using visual column
+    char_u	*pattern,	// search pattern
+    int		nr,		// error number
+    int		type,		// type character
+    int		valid)		// valid entry
+{
+    qfline_T	*qfp;
+    qfline_T	**lastp;	// pointer to qf_last or NULL
+
+    if ((qfp = ALLOC_ONE_ID(qfline_T, aid_qf_qfline)) == NULL)
+	return QF_FAIL;
+    if (bufnum != 0)
+    {
+	buf_T *buf = buflist_findnr(bufnum);
+
+	qfp->qf_fnum = bufnum;
+	if (buf != NULL)
+	    buf->b_has_qf_entry |=
+		IS_QF_LIST(qfl) ? BUF_HAS_QF_ENTRY : BUF_HAS_LL_ENTRY;
+    }
+    else
+	qfp->qf_fnum = qf_get_fnum(qfl, dir, fname);
+    if ((qfp->qf_text = vim_strsave(mesg)) == NULL)
+    {
+	vim_free(qfp);
+	return QF_FAIL;
+    }
+    qfp->qf_lnum = lnum;
+    qfp->qf_end_lnum = end_lnum;
+    qfp->qf_col = col;
+    qfp->qf_end_col = end_col;
+    qfp->qf_viscol = vis_col;
+    if (pattern == NULL || *pattern == NUL)
+	qfp->qf_pattern = NULL;
+    else if ((qfp->qf_pattern = vim_strsave(pattern)) == NULL)
+    {
+	vim_free(qfp->qf_text);
+	vim_free(qfp);
+	return QF_FAIL;
+    }
+    if (module == NULL || *module == NUL)
+	qfp->qf_module = NULL;
+    else if ((qfp->qf_module = vim_strsave(module)) == NULL)
+    {
+	vim_free(qfp->qf_text);
+	vim_free(qfp->qf_pattern);
+	vim_free(qfp);
+	return QF_FAIL;
+    }
+    qfp->qf_nr = nr;
+    if (type != 1 && !vim_isprintc(type)) // only printable chars allowed
+	type = 0;
+    qfp->qf_type = type;
+    qfp->qf_valid = valid;
+
+    lastp = &qfl->qf_last;
+    if (qf_list_empty(qfl))		// first element in the list
+    {
+	qfl->qf_start = qfp;
+	qfl->qf_ptr = qfp;
+	qfl->qf_index = 0;
+	qfp->qf_prev = NULL;
+    }
+    else
+    {
+	qfp->qf_prev = *lastp;
+	(*lastp)->qf_next = qfp;
+    }
+    qfp->qf_next = NULL;
+    qfp->qf_cleared = FALSE;
+    *lastp = qfp;
+    ++qfl->qf_count;
+    if (qfl->qf_index == 0 && qfp->qf_valid)	// first valid entry
+    {
+	qfl->qf_index = qfl->qf_count;
+	qfl->qf_ptr = qfp;
+    }
+
+    return QF_OK;
+}
+
+/*
+ * Allocate a new quickfix/location list stack
+ */
+    static qf_info_T *
+qf_alloc_stack(qfltype_T qfltype)
+{
+    qf_info_T *qi;
+
+    qi = ALLOC_CLEAR_ONE_ID(qf_info_T, aid_qf_qfinfo);
+    if (qi == NULL)
+	return NULL;
+
+    qi->qf_refcount++;
+    qi->qfl_type = qfltype;
+    qi->qf_bufnr = INVALID_QFBUFNR;
+    return qi;
+}
+
+/*
+ * Return the location list stack for window 'wp'.
+ * If not present, allocate a location list stack
+ */
+    static qf_info_T *
+ll_get_or_alloc_list(win_T *wp)
+{
+    if (IS_LL_WINDOW(wp))
+	// For a location list window, use the referenced location list
+	return wp->w_llist_ref;
+
+    // For a non-location list window, w_llist_ref should not point to a
+    // location list.
+    ll_free_all(&wp->w_llist_ref);
+
+    if (wp->w_llist == NULL)
+	wp->w_llist = qf_alloc_stack(QFLT_LOCATION);	// new location list
+    return wp->w_llist;
+}
+
+/*
+ * Get the quickfix/location list stack to use for the specified Ex command.
+ * For a location list command, returns the stack for the current window.  If
+ * the location list is not found, then returns NULL and prints an error
+ * message if 'print_emsg' is TRUE.
+ */
+    static qf_info_T *
+qf_cmd_get_stack(exarg_T *eap, int print_emsg)
+{
+    qf_info_T	*qi = &ql_info;
+
+    if (is_loclist_cmd(eap->cmdidx))
+    {
+	qi = GET_LOC_LIST(curwin);
+	if (qi == NULL)
+	{
+	    if (print_emsg)
+		emsg(_(e_no_location_list));
+	    return NULL;
+	}
+    }
+
+    return qi;
+}
+
+/*
+ * Get the quickfix/location list stack to use for the specified Ex command.
+ * For a location list command, returns the stack for the current window.
+ * If the location list is not present, then allocates a new one.
+ * Returns NULL if the allocation fails.  For a location list command, sets
+ * 'pwinp' to curwin.
+ */
+    static qf_info_T *
+qf_cmd_get_or_alloc_stack(exarg_T *eap, win_T **pwinp)
+{
+    qf_info_T	*qi = &ql_info;
+
+    if (is_loclist_cmd(eap->cmdidx))
+    {
+	qi = ll_get_or_alloc_list(curwin);
+	if (qi == NULL)
+	    return NULL;
+	*pwinp = curwin;
+    }
+
+    return qi;
+}
+
+/*
+ * Copy location list entries from 'from_qfl' to 'to_qfl'.
+ */
+    static int
+copy_loclist_entries(qf_list_T *from_qfl, qf_list_T *to_qfl)
+{
+    int		i;
+    qfline_T    *from_qfp;
+    qfline_T    *prevp;
+
+    // copy all the location entries in this list
+    FOR_ALL_QFL_ITEMS(from_qfl, from_qfp, i)
+    {
+	if (qf_add_entry(to_qfl,
+		    NULL,
+		    NULL,
+		    from_qfp->qf_module,
+		    0,
+		    from_qfp->qf_text,
+		    from_qfp->qf_lnum,
+		    from_qfp->qf_end_lnum,
+		    from_qfp->qf_col,
+		    from_qfp->qf_end_col,
+		    from_qfp->qf_viscol,
+		    from_qfp->qf_pattern,
+		    from_qfp->qf_nr,
+		    0,
+		    from_qfp->qf_valid) == QF_FAIL)
+	    return FAIL;
+
+	// qf_add_entry() will not set the qf_num field, as the
+	// directory and file names are not supplied. So the qf_fnum
+	// field is copied here.
+	prevp = to_qfl->qf_last;
+	prevp->qf_fnum = from_qfp->qf_fnum;	// file number
+	prevp->qf_type = from_qfp->qf_type;	// error type
+	if (from_qfl->qf_ptr == from_qfp)
+	    to_qfl->qf_ptr = prevp;		// current location
+    }
+
+    return OK;
+}
+
+/*
+ * Copy the specified location list 'from_qfl' to 'to_qfl'.
+ */
+    static int
+copy_loclist(qf_list_T *from_qfl, qf_list_T *to_qfl)
+{
+    // Some of the fields are populated by qf_add_entry()
+    to_qfl->qfl_type = from_qfl->qfl_type;
+    to_qfl->qf_nonevalid = from_qfl->qf_nonevalid;
+    to_qfl->qf_count = 0;
+    to_qfl->qf_index = 0;
+    to_qfl->qf_start = NULL;
+    to_qfl->qf_last = NULL;
+    to_qfl->qf_ptr = NULL;
+    if (from_qfl->qf_title != NULL)
+	to_qfl->qf_title = vim_strsave(from_qfl->qf_title);
+    else
+	to_qfl->qf_title = NULL;
+    if (from_qfl->qf_ctx != NULL)
+    {
+	to_qfl->qf_ctx = alloc_tv();
+	if (to_qfl->qf_ctx != NULL)
+	    copy_tv(from_qfl->qf_ctx, to_qfl->qf_ctx);
+    }
+    else
+	to_qfl->qf_ctx = NULL;
+    if (from_qfl->qf_qftf_cb.cb_name != NULL)
+	copy_callback(&to_qfl->qf_qftf_cb, &from_qfl->qf_qftf_cb);
+    else
+	to_qfl->qf_qftf_cb.cb_name = NULL;
+
+    if (from_qfl->qf_count)
+	if (copy_loclist_entries(from_qfl, to_qfl) == FAIL)
+	    return FAIL;
+
+    to_qfl->qf_index = from_qfl->qf_index;	// current index in the list
+
+    // Assign a new ID for the location list
+    to_qfl->qf_id = ++last_qf_id;
+    to_qfl->qf_changedtick = 0L;
+
+    // When no valid entries are present in the list, qf_ptr points to
+    // the first item in the list
+    if (to_qfl->qf_nonevalid)
+    {
+	to_qfl->qf_ptr = to_qfl->qf_start;
+	to_qfl->qf_index = 1;
+    }
+
+    return OK;
+}
+
+/*
+ * Copy the location list stack 'from' window to 'to' window.
+ */
+    void
+copy_loclist_stack(win_T *from, win_T *to)
+{
+    qf_info_T	*qi;
+    int		idx;
+
+    // When copying from a location list window, copy the referenced
+    // location list. For other windows, copy the location list for
+    // that window.
+    if (IS_LL_WINDOW(from))
+	qi = from->w_llist_ref;
+    else
+	qi = from->w_llist;
+
+    if (qi == NULL)		    // no location list to copy
+	return;
+
+    // allocate a new location list
+    if ((to->w_llist = qf_alloc_stack(QFLT_LOCATION)) == NULL)
+	return;
+
+    to->w_llist->qf_listcount = qi->qf_listcount;
+
+    // Copy the location lists one at a time
+    for (idx = 0; idx < qi->qf_listcount; ++idx)
+    {
+	to->w_llist->qf_curlist = idx;
+
+	if (copy_loclist(qf_get_list(qi, idx),
+			qf_get_list(to->w_llist, idx)) == FAIL)
+	{
+	    qf_free_all(to);
+	    return;
+	}
+    }
+
+    to->w_llist->qf_curlist = qi->qf_curlist;	// current list
+}
+
+/*
+ * Get buffer number for file "directory/fname".
+ * Also sets the b_has_qf_entry flag.
+ */
+    static int
+qf_get_fnum(qf_list_T *qfl, char_u *directory, char_u *fname)
+{
+    char_u	*ptr = NULL;
+    buf_T	*buf;
+    char_u	*bufname;
+
+    if (fname == NULL || *fname == NUL)		// no file name
+	return 0;
+
+#ifdef VMS
+    vms_remove_version(fname);
+#endif
+#ifdef BACKSLASH_IN_FILENAME
+    if (directory != NULL)
+	slash_adjust(directory);
+    slash_adjust(fname);
+#endif
+    if (directory != NULL && !vim_isAbsName(fname)
+	    && (ptr = concat_fnames(directory, fname, TRUE)) != NULL)
+    {
+	// Here we check if the file really exists.
+	// This should normally be true, but if make works without
+	// "leaving directory"-messages we might have missed a
+	// directory change.
+	if (mch_getperm(ptr) < 0)
+	{
+	    vim_free(ptr);
+	    directory = qf_guess_filepath(qfl, fname);
+	    if (directory)
+		ptr = concat_fnames(directory, fname, TRUE);
+	    else
+		ptr = vim_strsave(fname);
+	}
+	// Use concatenated directory name and file name
+	bufname = ptr;
+    }
+    else
+	bufname = fname;
+
+    if (qf_last_bufname != NULL && STRCMP(bufname, qf_last_bufname) == 0
+	    && bufref_valid(&qf_last_bufref))
+    {
+	buf = qf_last_bufref.br_buf;
+	vim_free(ptr);
+    }
+    else
+    {
+	vim_free(qf_last_bufname);
+	buf = buflist_new(bufname, NULL, (linenr_T)0, BLN_NOOPT);
+	if (bufname == ptr)
+	    qf_last_bufname = bufname;
+	else
+	    qf_last_bufname = vim_strsave(bufname);
+	set_bufref(&qf_last_bufref, buf);
+    }
+    if (buf == NULL)
+	return 0;
+
+    buf->b_has_qf_entry =
+			IS_QF_LIST(qfl) ? BUF_HAS_QF_ENTRY : BUF_HAS_LL_ENTRY;
+    return buf->b_fnum;
+}
+
+/*
+ * Push dirbuf onto the directory stack and return pointer to actual dir or
+ * NULL on error.
+ */
+    static char_u *
+qf_push_dir(char_u *dirbuf, struct dir_stack_T **stackptr, int is_file_stack)
+{
+    struct dir_stack_T  *ds_new;
+    struct dir_stack_T  *ds_ptr;
+
+    // allocate new stack element and hook it in
+    ds_new = ALLOC_ONE_ID(struct dir_stack_T, aid_qf_dirstack);
+    if (ds_new == NULL)
+	return NULL;
+
+    ds_new->next = *stackptr;
+    *stackptr = ds_new;
+
+    // store directory on the stack
+    if (vim_isAbsName(dirbuf)
+	    || (*stackptr)->next == NULL
+	    || is_file_stack)
+	(*stackptr)->dirname = vim_strsave(dirbuf);
+    else
+    {
+	// Okay we don't have an absolute path.
+	// dirbuf must be a subdir of one of the directories on the stack.
+	// Let's search...
+	ds_new = (*stackptr)->next;
+	(*stackptr)->dirname = NULL;
+	while (ds_new)
+	{
+	    vim_free((*stackptr)->dirname);
+	    (*stackptr)->dirname = concat_fnames(ds_new->dirname, dirbuf,
+		    TRUE);
+	    if (mch_isdir((*stackptr)->dirname) == TRUE)
+		break;
+
+	    ds_new = ds_new->next;
+	}
+
+	// clean up all dirs we already left
+	while ((*stackptr)->next != ds_new)
+	{
+	    ds_ptr = (*stackptr)->next;
+	    (*stackptr)->next = (*stackptr)->next->next;
+	    vim_free(ds_ptr->dirname);
+	    vim_free(ds_ptr);
+	}
+
+	// Nothing found -> it must be on top level
+	if (ds_new == NULL)
+	{
+	    vim_free((*stackptr)->dirname);
+	    (*stackptr)->dirname = vim_strsave(dirbuf);
+	}
+    }
+
+    if ((*stackptr)->dirname != NULL)
+	return (*stackptr)->dirname;
+    else
+    {
+	ds_ptr = *stackptr;
+	*stackptr = (*stackptr)->next;
+	vim_free(ds_ptr);
+	return NULL;
+    }
+}
+
+/*
+ * pop dirbuf from the directory stack and return previous directory or NULL if
+ * stack is empty
+ */
+    static char_u *
+qf_pop_dir(struct dir_stack_T **stackptr)
+{
+    struct dir_stack_T  *ds_ptr;
+
+    // TODO: Should we check if dirbuf is the directory on top of the stack?
+    // What to do if it isn't?
+
+    // pop top element and free it
+    if (*stackptr != NULL)
+    {
+	ds_ptr = *stackptr;
+	*stackptr = (*stackptr)->next;
+	vim_free(ds_ptr->dirname);
+	vim_free(ds_ptr);
+    }
+
+    // return NEW top element as current dir or NULL if stack is empty
+    return *stackptr ? (*stackptr)->dirname : NULL;
+}
+
+/*
+ * clean up directory stack
+ */
+    static void
+qf_clean_dir_stack(struct dir_stack_T **stackptr)
+{
+    struct dir_stack_T  *ds_ptr;
+
+    while ((ds_ptr = *stackptr) != NULL)
+    {
+	*stackptr = (*stackptr)->next;
+	vim_free(ds_ptr->dirname);
+	vim_free(ds_ptr);
+    }
+}
+
+/*
+ * Check in which directory of the directory stack the given file can be
+ * found.
+ * Returns a pointer to the directory name or NULL if not found.
+ * Cleans up intermediate directory entries.
+ *
+ * TODO: How to solve the following problem?
+ * If we have this directory tree:
+ *     ./
+ *     ./aa
+ *     ./aa/bb
+ *     ./bb
+ *     ./bb/x.c
+ * and make says:
+ *     making all in aa
+ *     making all in bb
+ *     x.c:9: Error
+ * Then qf_push_dir thinks we are in ./aa/bb, but we are in ./bb.
+ * qf_guess_filepath will return NULL.
+ */
+    static char_u *
+qf_guess_filepath(qf_list_T *qfl, char_u *filename)
+{
+    struct dir_stack_T     *ds_ptr;
+    struct dir_stack_T     *ds_tmp;
+    char_u		   *fullname;
+
+    // no dirs on the stack - there's nothing we can do
+    if (qfl->qf_dir_stack == NULL)
+	return NULL;
+
+    ds_ptr = qfl->qf_dir_stack->next;
+    fullname = NULL;
+    while (ds_ptr)
+    {
+	vim_free(fullname);
+	fullname = concat_fnames(ds_ptr->dirname, filename, TRUE);
+
+	// If concat_fnames failed, just go on. The worst thing that can happen
+	// is that we delete the entire stack.
+	if ((fullname != NULL) && (mch_getperm(fullname) >= 0))
+	    break;
+
+	ds_ptr = ds_ptr->next;
+    }
+
+    vim_free(fullname);
+
+    // clean up all dirs we already left
+    while (qfl->qf_dir_stack->next != ds_ptr)
+    {
+	ds_tmp = qfl->qf_dir_stack->next;
+	qfl->qf_dir_stack->next = qfl->qf_dir_stack->next->next;
+	vim_free(ds_tmp->dirname);
+	vim_free(ds_tmp);
+    }
+
+    return ds_ptr == NULL ? NULL : ds_ptr->dirname;
+}
+
+/*
+ * Returns TRUE if a quickfix/location list with the given identifier exists.
+ */
+    static int
+qflist_valid(win_T *wp, int_u qf_id)
+{
+    qf_info_T	*qi = &ql_info;
+    int		i;
+
+    if (wp != NULL)
+    {
+	if (!win_valid(wp))
+	    return FALSE;
+	qi = GET_LOC_LIST(wp);	    // Location list
+	if (qi == NULL)
+	    return FALSE;
+    }
+
+    for (i = 0; i < qi->qf_listcount; ++i)
+	if (qi->qf_lists[i].qf_id == qf_id)
+	    return TRUE;
+
+    return FALSE;
+}
+
+/*
+ * When loading a file from the quickfix, the autocommands may modify it.
+ * This may invalidate the current quickfix entry.  This function checks
+ * whether an entry is still present in the quickfix list.
+ * Similar to location list.
+ */
+    static int
+is_qf_entry_present(qf_list_T *qfl, qfline_T *qf_ptr)
+{
+    qfline_T	*qfp;
+    int		i;
+
+    // Search for the entry in the current list
+    FOR_ALL_QFL_ITEMS(qfl, qfp, i)
+	if (qfp == qf_ptr)
+	    break;
+
+    if (i > qfl->qf_count) // Entry is not found
+	return FALSE;
+
+    return TRUE;
+}
+
+/*
+ * Get the next valid entry in the current quickfix/location list. The search
+ * starts from the current entry.  Returns NULL on failure.
+ */
+    static qfline_T *
+get_next_valid_entry(
+	qf_list_T	*qfl,
+	qfline_T	*qf_ptr,
+	int		*qf_index,
+	int		dir)
+{
+    int			idx;
+    int			old_qf_fnum;
+
+    idx = *qf_index;
+    old_qf_fnum = qf_ptr->qf_fnum;
+
+    do
+    {
+	if (idx == qfl->qf_count || qf_ptr->qf_next == NULL)
+	    return NULL;
+	++idx;
+	qf_ptr = qf_ptr->qf_next;
+    } while ((!qfl->qf_nonevalid && !qf_ptr->qf_valid)
+	    || (dir == FORWARD_FILE && qf_ptr->qf_fnum == old_qf_fnum));
+
+    *qf_index = idx;
+    return qf_ptr;
+}
+
+/*
+ * Get the previous valid entry in the current quickfix/location list. The
+ * search starts from the current entry.  Returns NULL on failure.
+ */
+    static qfline_T *
+get_prev_valid_entry(
+	qf_list_T	*qfl,
+	qfline_T	*qf_ptr,
+	int		*qf_index,
+	int		dir)
+{
+    int			idx;
+    int			old_qf_fnum;
+
+    idx = *qf_index;
+    old_qf_fnum = qf_ptr->qf_fnum;
+
+    do
+    {
+	if (idx == 1 || qf_ptr->qf_prev == NULL)
+	    return NULL;
+	--idx;
+	qf_ptr = qf_ptr->qf_prev;
+    } while ((!qfl->qf_nonevalid && !qf_ptr->qf_valid)
+	    || (dir == BACKWARD_FILE && qf_ptr->qf_fnum == old_qf_fnum));
+
+    *qf_index = idx;
+    return qf_ptr;
+}
+
+/*
+ * Get the n'th (errornr) previous/next valid entry from the current entry in
+ * the quickfix list.
+ *   dir == FORWARD or FORWARD_FILE: next valid entry
+ *   dir == BACKWARD or BACKWARD_FILE: previous valid entry
+ */
+    static qfline_T *
+get_nth_valid_entry(
+	qf_list_T	*qfl,
+	int		errornr,
+	int		dir,
+	int		*new_qfidx)
+{
+    qfline_T		*qf_ptr = qfl->qf_ptr;
+    int			qf_idx = qfl->qf_index;
+    qfline_T		*prev_qf_ptr;
+    int			prev_index;
+    char		*err = e_no_more_items;
+
+    while (errornr--)
+    {
+	prev_qf_ptr = qf_ptr;
+	prev_index = qf_idx;
+
+	if (dir == FORWARD || dir == FORWARD_FILE)
+	    qf_ptr = get_next_valid_entry(qfl, qf_ptr, &qf_idx, dir);
+	else
+	    qf_ptr = get_prev_valid_entry(qfl, qf_ptr, &qf_idx, dir);
+	if (qf_ptr == NULL)
+	{
+	    qf_ptr = prev_qf_ptr;
+	    qf_idx = prev_index;
+	    if (err != NULL)
+	    {
+		emsg(_(err));
+		return NULL;
+	    }
+	    break;
+	}
+
+	err = NULL;
+    }
+
+    *new_qfidx = qf_idx;
+    return qf_ptr;
+}
+
+/*
+ * Get n'th (errornr) quickfix entry from the current entry in the quickfix
+ * list 'qfl'. Returns a pointer to the new entry and the index in 'new_qfidx'
+ */
+    static qfline_T *
+get_nth_entry(qf_list_T *qfl, int errornr, int *new_qfidx)
+{
+    qfline_T	*qf_ptr = qfl->qf_ptr;
+    int		qf_idx = qfl->qf_index;
+
+    // New error number is less than the current error number
+    while (errornr < qf_idx && qf_idx > 1 && qf_ptr->qf_prev != NULL)
+    {
+	--qf_idx;
+	qf_ptr = qf_ptr->qf_prev;
+    }
+    // New error number is greater than the current error number
+    while (errornr > qf_idx && qf_idx < qfl->qf_count &&
+						qf_ptr->qf_next != NULL)
+    {
+	++qf_idx;
+	qf_ptr = qf_ptr->qf_next;
+    }
+
+    *new_qfidx = qf_idx;
+    return qf_ptr;
+}
+
+/*
+ * Get a entry specified by 'errornr' and 'dir' from the current
+ * quickfix/location list. 'errornr' specifies the index of the entry and 'dir'
+ * specifies the direction (FORWARD/BACKWARD/FORWARD_FILE/BACKWARD_FILE).
+ * Returns a pointer to the entry and the index of the new entry is stored in
+ * 'new_qfidx'.
+ */
+    static qfline_T *
+qf_get_entry(
+	qf_list_T	*qfl,
+	int		errornr,
+	int		dir,
+	int		*new_qfidx)
+{
+    qfline_T	*qf_ptr = qfl->qf_ptr;
+    int		qfidx = qfl->qf_index;
+
+    if (dir != 0)    // next/prev valid entry
+	qf_ptr = get_nth_valid_entry(qfl, errornr, dir, &qfidx);
+    else if (errornr != 0)	// go to specified number
+	qf_ptr = get_nth_entry(qfl, errornr, &qfidx);
+
+    *new_qfidx = qfidx;
+    return qf_ptr;
+}
+
+/*
+ * Find a window displaying a Vim help file in the current tab page.
+ */
+    static win_T *
+qf_find_help_win(void)
+{
+    win_T *wp;
+
+    FOR_ALL_WINDOWS(wp)
+	if (bt_help(wp->w_buffer))
+	    return wp;
+
+    return NULL;
+}
+
+/*
+ * Set the location list for the specified window to 'qi'.
+ */
+    static void
+win_set_loclist(win_T *wp, qf_info_T *qi)
+{
+    wp->w_llist = qi;
+    qi->qf_refcount++;
+}
+
+/*
+ * Find a help window or open one. If 'newwin' is TRUE, then open a new help
+ * window.
+ */
+    static int
+jump_to_help_window(qf_info_T *qi, int newwin, int *opened_window)
+{
+    win_T	*wp;
+    int		flags;
+
+    if (cmdmod.cmod_tab != 0 || newwin)
+	wp = NULL;
+    else
+	wp = qf_find_help_win();
+    if (wp != NULL && wp->w_buffer->b_nwindows > 0)
+	win_enter(wp, TRUE);
+    else
+    {
+	// Split off help window; put it at far top if no position
+	// specified, the current window is vertically split and narrow.
+	flags = WSP_HELP;
+	if (cmdmod.cmod_split == 0 && curwin->w_width != Columns
+		&& curwin->w_width < 80)
+	    flags |= WSP_TOP;
+	// If the user asks to open a new window, then copy the location list.
+	// Otherwise, don't copy the location list.
+	if (IS_LL_STACK(qi) && !newwin)
+	    flags |= WSP_NEWLOC;
+
+	if (win_split(0, flags) == FAIL)
+	    return FAIL;
+
+	*opened_window = TRUE;
+
+	if (curwin->w_height < p_hh)
+	    win_setheight((int)p_hh);
+
+	// When using location list, the new window should use the supplied
+	// location list. If the user asks to open a new window, then the new
+	// window will get a copy of the location list.
+	if (IS_LL_STACK(qi) && !newwin)
+	    win_set_loclist(curwin, qi);
+    }
+
+    if (!p_im)
+	restart_edit = 0;	    // don't want insert mode in help file
+
+    return OK;
+}
+
+/*
+ * Find a non-quickfix window using the given location list stack in the
+ * current tabpage.
+ * Returns NULL if a matching window is not found.
+ */
+    static win_T *
+qf_find_win_with_loclist(qf_info_T *ll)
+{
+    win_T	*wp;
+
+    FOR_ALL_WINDOWS(wp)
+	if (wp->w_llist == ll && !bt_quickfix(wp->w_buffer))
+	    return wp;
+
+    return NULL;
+}
+
+/*
+ * Find a window containing a normal buffer in the current tab page.
+ */
+    static win_T *
+qf_find_win_with_normal_buf(void)
+{
+    win_T	*wp;
+
+    FOR_ALL_WINDOWS(wp)
+	if (bt_normal(wp->w_buffer))
+	    return wp;
+
+    return NULL;
+}
+
+/*
+ * Go to a window in any tabpage containing the specified file.  Returns TRUE
+ * if successfully jumped to the window. Otherwise returns FALSE.
+ */
+    static int
+qf_goto_tabwin_with_file(int fnum)
+{
+    tabpage_T	*tp;
+    win_T	*wp;
+
+    FOR_ALL_TAB_WINDOWS(tp, wp)
+	if (wp->w_buffer->b_fnum == fnum)
+	{
+	    goto_tabpage_win(tp, wp);
+	    return TRUE;
+	}
+
+    return FALSE;
+}
+
+/*
+ * Create a new window to show a file above the quickfix window. Called when
+ * only the quickfix window is present.
+ */
+    static int
+qf_open_new_file_win(qf_info_T *ll_ref)
+{
+    int		flags;
+
+    flags = WSP_ABOVE;
+    if (ll_ref != NULL)
+	flags |= WSP_NEWLOC;
+    if (win_split(0, flags) == FAIL)
+	return FAIL;		// not enough room for window
+    p_swb = empty_option;	// don't split again
+    swb_flags = 0;
+    RESET_BINDING(curwin);
+    if (ll_ref != NULL)
+	// The new window should use the location list from the
+	// location list window
+	win_set_loclist(curwin, ll_ref);
+    return OK;
+}
+
+/*
+ * Go to a window that shows the right buffer. If the window is not found, go
+ * to the window just above the location list window. This is used for opening
+ * a file from a location window and not from a quickfix window. If some usable
+ * window is previously found, then it is supplied in 'use_win'.
+ */
+    static void
+qf_goto_win_with_ll_file(win_T *use_win, int qf_fnum, qf_info_T *ll_ref)
+{
+    win_T	*win = use_win;
+
+    if (win == NULL)
+    {
+	// Find the window showing the selected file in the current tab page.
+	FOR_ALL_WINDOWS(win)
+	    if (win->w_buffer->b_fnum == qf_fnum)
+		break;
+	if (win == NULL)
+	{
+	    // Find a previous usable window
+	    win = curwin;
+	    do
+	    {
+		if (bt_normal(win->w_buffer))
+		    break;
+		if (win->w_prev == NULL)
+		    win = lastwin;	// wrap around the top
+		else
+		    win = win->w_prev; // go to previous window
+	    } while (win != curwin);
+	}
+    }
+    win_goto(win);
+
+    // If the location list for the window is not set, then set it
+    // to the location list from the location window
+    if (win->w_llist == NULL && ll_ref != NULL)
+	win_set_loclist(win, ll_ref);
+}
+
+/*
+ * Go to a window that contains the specified buffer 'qf_fnum'. If a window is
+ * not found, then go to the window just above the quickfix window. This is
+ * used for opening a file from a quickfix window and not from a location
+ * window.
+ */
+    static void
+qf_goto_win_with_qfl_file(int qf_fnum)
+{
+    win_T	*win;
+    win_T	*altwin;
+
+    win = curwin;
+    altwin = NULL;
+    for (;;)
+    {
+	if (win->w_buffer->b_fnum == qf_fnum)
+	    break;
+	if (win->w_prev == NULL)
+	    win = lastwin;	// wrap around the top
+	else
+	    win = win->w_prev;	// go to previous window
+
+	if (IS_QF_WINDOW(win))
+	{
+	    // Didn't find it, go to the window before the quickfix
+	    // window, unless 'switchbuf' contains 'uselast': in this case we
+	    // try to jump to the previously used window first.
+	    if ((swb_flags & SWB_USELAST) && win_valid(prevwin))
+		win = prevwin;
+	    else if (altwin != NULL)
+		win = altwin;
+	    else if (curwin->w_prev != NULL)
+		win = curwin->w_prev;
+	    else
+		win = curwin->w_next;
+	    break;
+	}
+
+	// Remember a usable window.
+	if (altwin == NULL && !win->w_p_pvw && bt_normal(win->w_buffer))
+	    altwin = win;
+    }
+
+    win_goto(win);
+}
+
+/*
+ * Find a suitable window for opening a file (qf_fnum) from the
+ * quickfix/location list and jump to it.  If the file is already opened in a
+ * window, jump to it. Otherwise open a new window to display the file. If
+ * 'newwin' is TRUE, then always open a new window. This is called from either
+ * a quickfix or a location list window.
+ */
+    static int
+qf_jump_to_usable_window(int qf_fnum, int newwin, int *opened_window)
+{
+    win_T	*usable_wp = NULL;
+    int		usable_win = FALSE;
+    qf_info_T	*ll_ref = NULL;
+
+    // If opening a new window, then don't use the location list referred by
+    // the current window.  Otherwise two windows will refer to the same
+    // location list.
+    if (!newwin)
+	ll_ref = curwin->w_llist_ref;
+
+    if (ll_ref != NULL)
+    {
+	// Find a non-quickfix window with this location list
+	usable_wp = qf_find_win_with_loclist(ll_ref);
+	if (usable_wp != NULL)
+	    usable_win = TRUE;
+    }
+
+    if (!usable_win)
+    {
+	// Locate a window showing a normal buffer
+	win_T	*win = qf_find_win_with_normal_buf();
+	if (win != NULL)
+	    usable_win = TRUE;
+    }
+
+    // If no usable window is found and 'switchbuf' contains "usetab"
+    // then search in other tabs.
+    if (!usable_win && (swb_flags & SWB_USETAB))
+	usable_win = qf_goto_tabwin_with_file(qf_fnum);
+
+    // If there is only one window and it is the quickfix window, create a
+    // new one above the quickfix window.
+    if ((ONE_WINDOW && bt_quickfix(curbuf)) || !usable_win || newwin)
+    {
+	if (qf_open_new_file_win(ll_ref) != OK)
+	    return FAIL;
+	*opened_window = TRUE;	// close it when fail
+    }
+    else
+    {
+	if (curwin->w_llist_ref != NULL)	// In a location window
+	    qf_goto_win_with_ll_file(usable_wp, qf_fnum, ll_ref);
+	else					// In a quickfix window
+	    qf_goto_win_with_qfl_file(qf_fnum);
+    }
+
+    return OK;
+}
+
+/*
+ * Edit the selected file or help file.
+ * Returns OK if successfully edited the file, FAIL on failing to open the
+ * buffer and QF_ABORT if the quickfix/location list was freed by an autocmd
+ * when opening the buffer.
+ */
+    static int
+qf_jump_edit_buffer(
+	qf_info_T	*qi,
+	qfline_T	*qf_ptr,
+	int		forceit,
+	int		prev_winid,
+	int		*opened_window)
+{
+    qf_list_T	*qfl = qf_get_curlist(qi);
+    int		old_changedtick = qfl->qf_changedtick;
+    qfltype_T	qfl_type = qfl->qfl_type;
+    int		retval = OK;
+    int		old_qf_curlist = qi->qf_curlist;
+    int		save_qfid = qfl->qf_id;
+
+    if (qf_ptr->qf_type == 1)
+    {
+	// Open help file (do_ecmd() will set b_help flag, readfile() will
+	// set b_p_ro flag).
+	if (!can_abandon(curbuf, forceit))
+	{
+	    no_write_message();
+	    return FAIL;
+	}
+
+	retval = do_ecmd(qf_ptr->qf_fnum, NULL, NULL, NULL, (linenr_T)1,
+		ECMD_HIDE + ECMD_SET_HELP,
+		prev_winid == curwin->w_id ? curwin : NULL);
+    }
+    else
+	retval = buflist_getfile(qf_ptr->qf_fnum,
+		(linenr_T)1, GETF_SETMARK | GETF_SWITCH, forceit);
+
+    // If a location list, check whether the associated window is still
+    // present.
+    if (qfl_type == QFLT_LOCATION)
+    {
+	win_T	*wp = win_id2wp(prev_winid);
+
+	if (wp == NULL && curwin->w_llist != qi)
+	{
+	    emsg(_(e_current_window_was_closed));
+	    *opened_window = FALSE;
+	    return QF_ABORT;
+	}
+    }
+
+    if (qfl_type == QFLT_QUICKFIX && !qflist_valid(NULL, save_qfid))
+    {
+	emsg(_(e_current_quickfix_list_was_changed));
+	return QF_ABORT;
+    }
+
+    // Check if the list was changed.  The pointers may happen to be identical,
+    // thus also check qf_changedtick.
+    if (old_qf_curlist != qi->qf_curlist
+	    || old_changedtick != qfl->qf_changedtick
+	    || !is_qf_entry_present(qfl, qf_ptr))
+    {
+	if (qfl_type == QFLT_QUICKFIX)
+	    emsg(_(e_current_quickfix_list_was_changed));
+	else
+	    emsg(_(e_current_location_list_was_changed));
+	return QF_ABORT;
+    }
+
+    return retval;
+}
+
+/*
+ * Go to the error line in the current file using either line/column number or
+ * a search pattern.
+ */
+    static void
+qf_jump_goto_line(
+	linenr_T	qf_lnum,
+	int		qf_col,
+	char_u		qf_viscol,
+	char_u		*qf_pattern)
+{
+    linenr_T		i;
+
+    if (qf_pattern == NULL)
+    {
+	// Go to line with error, unless qf_lnum is 0.
+	i = qf_lnum;
+	if (i > 0)
+	{
+	    if (i > curbuf->b_ml.ml_line_count)
+		i = curbuf->b_ml.ml_line_count;
+	    curwin->w_cursor.lnum = i;
+	}
+	if (qf_col > 0)
+	{
+	    curwin->w_cursor.coladd = 0;
+	    if (qf_viscol == TRUE)
+		coladvance(qf_col - 1);
+	    else
+		curwin->w_cursor.col = qf_col - 1;
+	    curwin->w_set_curswant = TRUE;
+	    check_cursor();
+	}
+	else
+	    beginline(BL_WHITE | BL_FIX);
+    }
+    else
+    {
+	pos_T save_cursor;
+
+	// Move the cursor to the first line in the buffer
+	save_cursor = curwin->w_cursor;
+	curwin->w_cursor.lnum = 0;
+	if (!do_search(NULL, '/', '/', qf_pattern, (long)1, SEARCH_KEEP, NULL))
+	    curwin->w_cursor = save_cursor;
+    }
+}
+
+/*
+ * Display quickfix list index and size message
+ */
+    static void
+qf_jump_print_msg(
+	qf_info_T	*qi,
+	int		qf_index,
+	qfline_T	*qf_ptr,
+	buf_T		*old_curbuf,
+	linenr_T	old_lnum)
+{
+    linenr_T		i;
+    garray_T		*gap;
+
+    gap = qfga_get();
+
+    // Update the screen before showing the message, unless the screen
+    // scrolled up.
+    if (!msg_scrolled)
+	update_topline_redraw();
+    vim_snprintf((char *)IObuff, IOSIZE, _("(%d of %d)%s%s: "), qf_index,
+	    qf_get_curlist(qi)->qf_count,
+	    qf_ptr->qf_cleared ? _(" (line deleted)") : "",
+	    (char *)qf_types(qf_ptr->qf_type, qf_ptr->qf_nr));
+    // Add the message, skipping leading whitespace and newlines.
+    ga_concat(gap, IObuff);
+    qf_fmt_text(gap, skipwhite(qf_ptr->qf_text));
+
+    // Output the message.  Overwrite to avoid scrolling when the 'O'
+    // flag is present in 'shortmess'; But when not jumping, print the
+    // whole message.
+    i = msg_scroll;
+    if (curbuf == old_curbuf && curwin->w_cursor.lnum == old_lnum)
+	msg_scroll = TRUE;
+    else if (!msg_scrolled && shortmess(SHM_OVERALL))
+	msg_scroll = FALSE;
+    msg_attr_keep((char *)gap->ga_data, 0, TRUE);
+    msg_scroll = i;
+
+    qfga_clear();
+}
+
+/*
+ * Find a usable window for opening a file from the quickfix/location list. If
+ * a window is not found then open a new window. If 'newwin' is TRUE, then open
+ * a new window.
+ * Returns OK if successfully jumped or opened a window. Returns FAIL if not
+ * able to jump/open a window.  Returns NOTDONE if a file is not associated
+ * with the entry.  Returns QF_ABORT if the quickfix/location list was modified
+ * by an autocmd.
+ */
+    static int
+qf_jump_open_window(
+	qf_info_T	*qi,
+	qfline_T	*qf_ptr,
+	int		newwin,
+	int		*opened_window)
+{
+    qf_list_T	*qfl = qf_get_curlist(qi);
+    int		old_changedtick = qfl->qf_changedtick;
+    int		old_qf_curlist = qi->qf_curlist;
+    qfltype_T	qfl_type = qfl->qfl_type;
+
+    // For ":helpgrep" find a help window or open one.
+    if (qf_ptr->qf_type == 1 && (!bt_help(curwin->w_buffer)
+						      || cmdmod.cmod_tab != 0))
+	if (jump_to_help_window(qi, newwin, opened_window) == FAIL)
+	    return FAIL;
+    if (old_qf_curlist != qi->qf_curlist
+	    || old_changedtick != qfl->qf_changedtick
+	    || !is_qf_entry_present(qfl, qf_ptr))
+    {
+	if (qfl_type == QFLT_QUICKFIX)
+	    emsg(_(e_current_quickfix_list_was_changed));
+	else
+	    emsg(_(e_current_location_list_was_changed));
+	return QF_ABORT;
+    }
+
+    // If currently in the quickfix window, find another window to show the
+    // file in.
+    if (bt_quickfix(curbuf) && !*opened_window)
+    {
+	// If there is no file specified, we don't know where to go.
+	// But do advance, otherwise ":cn" gets stuck.
+	if (qf_ptr->qf_fnum == 0)
+	    return NOTDONE;
+
+	if (qf_jump_to_usable_window(qf_ptr->qf_fnum, newwin,
+						opened_window) == FAIL)
+	    return FAIL;
+    }
+    if (old_qf_curlist != qi->qf_curlist
+	    || old_changedtick != qfl->qf_changedtick
+	    || !is_qf_entry_present(qfl, qf_ptr))
+    {
+	if (qfl_type == QFLT_QUICKFIX)
+	    emsg(_(e_current_quickfix_list_was_changed));
+	else
+	    emsg(_(e_current_location_list_was_changed));
+	return QF_ABORT;
+    }
+
+    return OK;
+}
+
+/*
+ * Edit a selected file from the quickfix/location list and jump to a
+ * particular line/column, adjust the folds and display a message about the
+ * jump.
+ * Returns OK on success and FAIL on failing to open the file/buffer.  Returns
+ * QF_ABORT if the quickfix/location list is freed by an autocmd when opening
+ * the file.
+ */
+    static int
+qf_jump_to_buffer(
+	qf_info_T	*qi,
+	int		qf_index,
+	qfline_T	*qf_ptr,
+	int		forceit,
+	int		prev_winid,
+	int		*opened_window,
+	int		openfold,
+	int		print_message)
+{
+    buf_T	*old_curbuf;
+    linenr_T	old_lnum;
+    int		retval = OK;
+
+    // If there is a file name, read the wanted file if needed, and check
+    // autowrite etc.
+    old_curbuf = curbuf;
+    old_lnum = curwin->w_cursor.lnum;
+
+    if (qf_ptr->qf_fnum != 0)
+    {
+	retval = qf_jump_edit_buffer(qi, qf_ptr, forceit, prev_winid,
+						opened_window);
+	if (retval != OK)
+	    return retval;
+    }
+
+    // When not switched to another buffer, still need to set pc mark
+    if (curbuf == old_curbuf)
+	setpcmark();
+
+    qf_jump_goto_line(qf_ptr->qf_lnum, qf_ptr->qf_col, qf_ptr->qf_viscol,
+	    qf_ptr->qf_pattern);
+
+#ifdef FEAT_FOLDING
+    if ((fdo_flags & FDO_QUICKFIX) && openfold)
+	foldOpenCursor();
+#endif
+    if (print_message)
+	qf_jump_print_msg(qi, qf_index, qf_ptr, old_curbuf, old_lnum);
+
+    return retval;
+}
+
+/*
+ * Jump to a quickfix line and try to use an existing window.
+ */
+    void
+qf_jump(qf_info_T	*qi,
+	int		dir,
+	int		errornr,
+	int		forceit)
+{
+    qf_jump_newwin(qi, dir, errornr, forceit, FALSE);
+}
+
+/*
+ * Jump to a quickfix line.
+ * If dir == 0 go to entry "errornr".
+ * If dir == FORWARD go "errornr" valid entries forward.
+ * If dir == BACKWARD go "errornr" valid entries backward.
+ * If dir == FORWARD_FILE go "errornr" valid entries files backward.
+ * If dir == BACKWARD_FILE go "errornr" valid entries files backward
+ * else if "errornr" is zero, redisplay the same line
+ * If 'forceit' is TRUE, then can discard changes to the current buffer.
+ * If 'newwin' is TRUE, then open the file in a new window.
+ */
+    static void
+qf_jump_newwin(qf_info_T	*qi,
+	int		dir,
+	int		errornr,
+	int		forceit,
+	int		newwin)
+{
+    qf_list_T		*qfl;
+    qfline_T		*qf_ptr;
+    qfline_T		*old_qf_ptr;
+    int			qf_index;
+    int			old_qf_index;
+    char_u		*old_swb = p_swb;
+    unsigned		old_swb_flags = swb_flags;
+    int			prev_winid;
+    int			opened_window = FALSE;
+    int			print_message = TRUE;
+    int			old_KeyTyped = KeyTyped; // getting file may reset it
+    int			retval = OK;
+
+    if (qi == NULL)
+	qi = &ql_info;
+
+    if (qf_stack_empty(qi) || qf_list_empty(qf_get_curlist(qi)))
+    {
+	emsg(_(e_no_errors));
+	return;
+    }
+
+    incr_quickfix_busy();
+
+    qfl = qf_get_curlist(qi);
+
+    qf_ptr = qfl->qf_ptr;
+    old_qf_ptr = qf_ptr;
+    qf_index = qfl->qf_index;
+    old_qf_index = qf_index;
+
+    qf_ptr = qf_get_entry(qfl, errornr, dir, &qf_index);
+    if (qf_ptr == NULL)
+    {
+	qf_ptr = old_qf_ptr;
+	qf_index = old_qf_index;
+	goto theend;
+    }
+
+    qfl->qf_index = qf_index;
+    qfl->qf_ptr = qf_ptr;
+    if (qf_win_pos_update(qi, old_qf_index))
+	// No need to print the error message if it's visible in the error
+	// window
+	print_message = FALSE;
+
+    prev_winid = curwin->w_id;
+
+    retval = qf_jump_open_window(qi, qf_ptr, newwin, &opened_window);
+    if (retval == FAIL)
+	goto failed;
+    if (retval == QF_ABORT)
+    {
+	qi = NULL;
+	qf_ptr = NULL;
+	goto theend;
+    }
+    if (retval == NOTDONE)
+	goto theend;
+
+    retval = qf_jump_to_buffer(qi, qf_index, qf_ptr, forceit, prev_winid,
+				  &opened_window, old_KeyTyped, print_message);
+    if (retval == QF_ABORT)
+    {
+	// Quickfix/location list was modified by an autocmd
+	qi = NULL;
+	qf_ptr = NULL;
+    }
+
+    if (retval != OK)
+    {
+	if (opened_window)
+	    win_close(curwin, TRUE);    // Close opened window
+	if (qf_ptr != NULL && qf_ptr->qf_fnum != 0)
+	{
+	    // Couldn't open file, so put index back where it was.  This could
+	    // happen if the file was readonly and we changed something.
+failed:
+	    qf_ptr = old_qf_ptr;
+	    qf_index = old_qf_index;
+	}
+    }
+theend:
+    if (qi != NULL)
+    {
+	qfl->qf_ptr = qf_ptr;
+	qfl->qf_index = qf_index;
+    }
+    if (p_swb != old_swb && p_swb == empty_option)
+    {
+	// Restore old 'switchbuf' value, but not when an autocommand or
+	// modeline has changed the value.
+	p_swb = old_swb;
+	swb_flags = old_swb_flags;
+    }
+    decr_quickfix_busy();
+}
+
+// Highlight attributes used for displaying entries from the quickfix list.
+static int	qfFileAttr;
+static int	qfSepAttr;
+static int	qfLineAttr;
+
+/*
+ * Display information about a single entry from the quickfix/location list.
+ * Used by ":clist/:llist" commands.
+ * 'cursel' will be set to TRUE for the currently selected entry in the
+ * quickfix list.
+ */
+    static void
+qf_list_entry(qfline_T *qfp, int qf_idx, int cursel)
+{
+    char_u	*fname;
+    buf_T	*buf;
+    int		filter_entry;
+    garray_T	*gap;
+
+    fname = NULL;
+    if (qfp->qf_module != NULL && *qfp->qf_module != NUL)
+	vim_snprintf((char *)IObuff, IOSIZE, "%2d %s", qf_idx,
+						(char *)qfp->qf_module);
+    else
+    {
+	if (qfp->qf_fnum != 0
+		&& (buf = buflist_findnr(qfp->qf_fnum)) != NULL)
+	{
+	    fname = buf->b_fname;
+	    if (qfp->qf_type == 1)	// :helpgrep
+		fname = gettail(fname);
+	}
+	if (fname == NULL)
+	    sprintf((char *)IObuff, "%2d", qf_idx);
+	else
+	    vim_snprintf((char *)IObuff, IOSIZE, "%2d %s",
+		    qf_idx, (char *)fname);
+    }
+
+    // Support for filtering entries using :filter /pat/ clist
+    // Match against the module name, file name, search pattern and
+    // text of the entry.
+    filter_entry = TRUE;
+    if (qfp->qf_module != NULL && *qfp->qf_module != NUL)
+	filter_entry &= message_filtered(qfp->qf_module);
+    if (filter_entry && fname != NULL)
+	filter_entry &= message_filtered(fname);
+    if (filter_entry && qfp->qf_pattern != NULL)
+	filter_entry &= message_filtered(qfp->qf_pattern);
+    if (filter_entry)
+	filter_entry &= message_filtered(qfp->qf_text);
+    if (filter_entry)
+	return;
+
+    msg_putchar('\n');
+    msg_outtrans_attr(IObuff, cursel ? HL_ATTR(HLF_QFL) : qfFileAttr);
+
+    if (qfp->qf_lnum != 0)
+	msg_puts_attr(":", qfSepAttr);
+    gap = qfga_get();
+    if (qfp->qf_lnum == 0)
+	ga_append(gap, NUL);
+    else
+	qf_range_text(gap, qfp);
+    ga_concat(gap, qf_types(qfp->qf_type, qfp->qf_nr));
+    ga_append(gap, NUL);
+    msg_puts_attr((char *)gap->ga_data, qfLineAttr);
+    msg_puts_attr(":", qfSepAttr);
+    if (qfp->qf_pattern != NULL)
+    {
+	gap = qfga_get();
+	qf_fmt_text(gap, qfp->qf_pattern);
+	msg_puts((char *)gap->ga_data);
+	msg_puts_attr(":", qfSepAttr);
+    }
+    msg_puts(" ");
+
+    // Remove newlines and leading whitespace from the text.  For an
+    // unrecognized line keep the indent, the compiler may mark a word
+    // with ^^^^.
+    gap = qfga_get();
+    qf_fmt_text(gap, (fname != NULL || qfp->qf_lnum != 0)
+	    ? skipwhite(qfp->qf_text) : qfp->qf_text);
+    msg_prt_line((char_u *)gap->ga_data, FALSE);
+    out_flush();		// show one line at a time
+}
+
+/*
+ * ":clist": list all errors
+ * ":llist": list all locations
+ */
+    void
+qf_list(exarg_T *eap)
+{
+    qf_list_T	*qfl;
+    qfline_T	*qfp;
+    int		i;
+    int		idx1 = 1;
+    int		idx2 = -1;
+    char_u	*arg = eap->arg;
+    int		plus = FALSE;
+    int		all = eap->forceit;	// if not :cl!, only show
+					// recognised errors
+    qf_info_T	*qi;
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    if (qf_stack_empty(qi) || qf_list_empty(qf_get_curlist(qi)))
+    {
+	emsg(_(e_no_errors));
+	return;
+    }
+    if (*arg == '+')
+    {
+	++arg;
+	plus = TRUE;
+    }
+    if (!get_list_range(&arg, &idx1, &idx2) || *arg != NUL)
+    {
+	semsg(_(e_trailing_characters_str), arg);
+	return;
+    }
+    qfl = qf_get_curlist(qi);
+    if (plus)
+    {
+	i = qfl->qf_index;
+	idx2 = i + idx1;
+	idx1 = i;
+    }
+    else
+    {
+	i = qfl->qf_count;
+	if (idx1 < 0)
+	    idx1 = (-idx1 > i) ? 0 : idx1 + i + 1;
+	if (idx2 < 0)
+	    idx2 = (-idx2 > i) ? 0 : idx2 + i + 1;
+    }
+
+    // Shorten all the file names, so that it is easy to read
+    shorten_fnames(FALSE);
+
+    // Get the attributes for the different quickfix highlight items.  Note
+    // that this depends on syntax items defined in the qf.vim syntax file
+    qfFileAttr = syn_name2attr((char_u *)"qfFileName");
+    if (qfFileAttr == 0)
+	qfFileAttr = HL_ATTR(HLF_D);
+    qfSepAttr = syn_name2attr((char_u *)"qfSeparator");
+    if (qfSepAttr == 0)
+	qfSepAttr = HL_ATTR(HLF_D);
+    qfLineAttr = syn_name2attr((char_u *)"qfLineNr");
+    if (qfLineAttr == 0)
+	qfLineAttr = HL_ATTR(HLF_N);
+
+    if (qfl->qf_nonevalid)
+	all = TRUE;
+    FOR_ALL_QFL_ITEMS(qfl, qfp, i)
+    {
+	if ((qfp->qf_valid || all) && idx1 <= i && i <= idx2)
+	    qf_list_entry(qfp, i, i == qfl->qf_index);
+
+	ui_breakcheck();
+    }
+    qfga_clear();
+}
+
+/*
+ * Remove newlines and leading whitespace from an error message.
+ * Add the result to the grow array "gap".
+ */
+    static void
+qf_fmt_text(garray_T *gap, char_u *text)
+{
+    char_u	*p = text;
+
+    while (*p != NUL)
+    {
+	if (*p == '\n')
+	{
+	    ga_append(gap, ' ');
+	    while (*++p != NUL)
+		if (!VIM_ISWHITE(*p) && *p != '\n')
+		    break;
+	}
+	else
+	    ga_append(gap, *p++);
+    }
+
+    ga_append(gap, NUL);
+}
+
+/*
+ * Add the range information from the lnum, col, end_lnum, and end_col values
+ * of a quickfix entry to the grow array "gap".
+ */
+    static void
+qf_range_text(garray_T *gap, qfline_T *qfp)
+{
+    char_u	*buf = IObuff;
+    int		bufsize = IOSIZE;
+    int len;
+
+    vim_snprintf((char *)buf, bufsize, "%ld", qfp->qf_lnum);
+    len = (int)STRLEN(buf);
+
+    if (qfp->qf_end_lnum > 0 && qfp->qf_lnum != qfp->qf_end_lnum)
+    {
+	vim_snprintf((char *)buf + len, bufsize - len,
+		"-%ld", qfp->qf_end_lnum);
+	len += (int)STRLEN(buf + len);
+    }
+    if (qfp->qf_col > 0)
+    {
+	vim_snprintf((char *)buf + len, bufsize - len, " col %d", qfp->qf_col);
+	len += (int)STRLEN(buf + len);
+	if (qfp->qf_end_col > 0 && qfp->qf_col != qfp->qf_end_col)
+	{
+	    vim_snprintf((char *)buf + len, bufsize - len,
+		    "-%d", qfp->qf_end_col);
+	    len += (int)STRLEN(buf + len);
+	}
+    }
+    buf[len] = NUL;
+
+    ga_concat_len(gap, buf, len);
+}
+
+/*
+ * Display information (list number, list size and the title) about a
+ * quickfix/location list.
+ */
+    static void
+qf_msg(qf_info_T *qi, int which, char *lead)
+{
+    char   *title = (char *)qi->qf_lists[which].qf_title;
+    int    count = qi->qf_lists[which].qf_count;
+    char_u buf[IOSIZE];
+
+    vim_snprintf((char *)buf, IOSIZE, _("%serror list %d of %d; %d errors "),
+	    lead,
+	    which + 1,
+	    qi->qf_listcount,
+	    count);
+
+    if (title != NULL)
+    {
+	size_t	len = STRLEN(buf);
+
+	if (len < 34)
+	{
+	    vim_memset(buf + len, ' ', 34 - len);
+	    buf[34] = NUL;
+	}
+	vim_strcat(buf, (char_u *)title, IOSIZE);
+    }
+    trunc_string(buf, buf, Columns - 1, IOSIZE);
+    msg((char *)buf);
+}
+
+/*
+ * ":colder [count]": Up in the quickfix stack.
+ * ":cnewer [count]": Down in the quickfix stack.
+ * ":lolder [count]": Up in the location list stack.
+ * ":lnewer [count]": Down in the location list stack.
+ */
+    void
+qf_age(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    int		count;
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    if (eap->addr_count != 0)
+	count = eap->line2;
+    else
+	count = 1;
+    while (count--)
+    {
+	if (eap->cmdidx == CMD_colder || eap->cmdidx == CMD_lolder)
+	{
+	    if (qi->qf_curlist == 0)
+	    {
+		emsg(_(e_at_bottom_of_quickfix_stack));
+		break;
+	    }
+	    --qi->qf_curlist;
+	}
+	else
+	{
+	    if (qi->qf_curlist >= qi->qf_listcount - 1)
+	    {
+		emsg(_(e_at_top_of_quickfix_stack));
+		break;
+	    }
+	    ++qi->qf_curlist;
+	}
+    }
+    qf_msg(qi, qi->qf_curlist, "");
+    qf_update_buffer(qi, NULL);
+}
+
+/*
+ * Display the information about all the quickfix/location lists in the stack
+ */
+    void
+qf_history(exarg_T *eap)
+{
+    qf_info_T	*qi = qf_cmd_get_stack(eap, FALSE);
+    int		i;
+
+    if (eap->addr_count > 0)
+    {
+	if (qi == NULL)
+	{
+	    emsg(_(e_no_location_list));
+	    return;
+	}
+
+	// Jump to the specified quickfix list
+	if (eap->line2 > 0 && eap->line2 <= qi->qf_listcount)
+	{
+	    qi->qf_curlist = eap->line2 - 1;
+	    qf_msg(qi, qi->qf_curlist, "");
+	    qf_update_buffer(qi, NULL);
+	}
+	else
+	    emsg(_(e_invalid_range));
+
+	return;
+    }
+
+    if (qf_stack_empty(qi))
+	msg(_("No entries"));
+    else
+	for (i = 0; i < qi->qf_listcount; ++i)
+	    qf_msg(qi, i, i == qi->qf_curlist ? "> " : "  ");
+}
+
+/*
+ * Free all the entries in the error list "idx". Note that other information
+ * associated with the list like context and title are not freed.
+ */
+    static void
+qf_free_items(qf_list_T *qfl)
+{
+    qfline_T	*qfp;
+    qfline_T	*qfpnext;
+    int		stop = FALSE;
+
+    while (qfl->qf_count && qfl->qf_start != NULL)
+    {
+	qfp = qfl->qf_start;
+	qfpnext = qfp->qf_next;
+	if (!stop)
+	{
+	    vim_free(qfp->qf_module);
+	    vim_free(qfp->qf_text);
+	    vim_free(qfp->qf_pattern);
+	    stop = (qfp == qfpnext);
+	    vim_free(qfp);
+	    if (stop)
+		// Somehow qf_count may have an incorrect value, set it to 1
+		// to avoid crashing when it's wrong.
+		// TODO: Avoid qf_count being incorrect.
+		qfl->qf_count = 1;
+	}
+	qfl->qf_start = qfpnext;
+	--qfl->qf_count;
+    }
+
+    qfl->qf_index = 0;
+    qfl->qf_start = NULL;
+    qfl->qf_last = NULL;
+    qfl->qf_ptr = NULL;
+    qfl->qf_nonevalid = TRUE;
+
+    qf_clean_dir_stack(&qfl->qf_dir_stack);
+    qfl->qf_directory = NULL;
+    qf_clean_dir_stack(&qfl->qf_file_stack);
+    qfl->qf_currfile = NULL;
+    qfl->qf_multiline = FALSE;
+    qfl->qf_multiignore = FALSE;
+    qfl->qf_multiscan = FALSE;
+}
+
+/*
+ * Free error list "idx". Frees all the entries in the quickfix list,
+ * associated context information and the title.
+ */
+    static void
+qf_free(qf_list_T *qfl)
+{
+    qf_free_items(qfl);
+
+    VIM_CLEAR(qfl->qf_title);
+    free_tv(qfl->qf_ctx);
+    qfl->qf_ctx = NULL;
+    free_callback(&qfl->qf_qftf_cb);
+    qfl->qf_id = 0;
+    qfl->qf_changedtick = 0L;
+}
+
+/*
+ * qf_mark_adjust: adjust marks
+ */
+   void
+qf_mark_adjust(
+	win_T	*wp,
+	linenr_T	line1,
+	linenr_T	line2,
+	long	amount,
+	long	amount_after)
+{
+    int		i;
+    qfline_T	*qfp;
+    int		idx;
+    qf_info_T	*qi = &ql_info;
+    int		found_one = FALSE;
+    int		buf_has_flag = wp == NULL ? BUF_HAS_QF_ENTRY : BUF_HAS_LL_ENTRY;
+
+    if (!(curbuf->b_has_qf_entry & buf_has_flag))
+	return;
+    if (wp != NULL)
+    {
+	if (wp->w_llist == NULL)
+	    return;
+	qi = wp->w_llist;
+    }
+
+    for (idx = 0; idx < qi->qf_listcount; ++idx)
+    {
+	qf_list_T	*qfl = qf_get_list(qi, idx);
+
+	if (!qf_list_empty(qfl))
+	    FOR_ALL_QFL_ITEMS(qfl, qfp, i)
+		if (qfp->qf_fnum == curbuf->b_fnum)
+		{
+		    found_one = TRUE;
+		    if (qfp->qf_lnum >= line1 && qfp->qf_lnum <= line2)
+		    {
+			if (amount == MAXLNUM)
+			    qfp->qf_cleared = TRUE;
+			else
+			    qfp->qf_lnum += amount;
+		    }
+		    else if (amount_after && qfp->qf_lnum > line2)
+			qfp->qf_lnum += amount_after;
+		}
+    }
+
+    if (!found_one)
+	curbuf->b_has_qf_entry &= ~buf_has_flag;
+}
+
+/*
+ * Make a nice message out of the error character and the error number:
+ *  char    number	message
+ *  e or E    0		" error"
+ *  w or W    0		" warning"
+ *  i or I    0		" info"
+ *  n or N    0		" note"
+ *  0	      0		""
+ *  other     0		" c"
+ *  e or E    n		" error n"
+ *  w or W    n		" warning n"
+ *  i or I    n		" info n"
+ *  n or N    n		" note n"
+ *  0	      n		" error n"
+ *  other     n		" c n"
+ *  1	      x		""	:helpgrep
+ */
+    static char_u *
+qf_types(int c, int nr)
+{
+    static char_u	buf[20];
+    static char_u	cc[3];
+    char_u		*p;
+
+    if (c == 'W' || c == 'w')
+	p = (char_u *)" warning";
+    else if (c == 'I' || c == 'i')
+	p = (char_u *)" info";
+    else if (c == 'N' || c == 'n')
+	p = (char_u *)" note";
+    else if (c == 'E' || c == 'e' || (c == 0 && nr > 0))
+	p = (char_u *)" error";
+    else if (c == 0 || c == 1)
+	p = (char_u *)"";
+    else
+    {
+	cc[0] = ' ';
+	cc[1] = c;
+	cc[2] = NUL;
+	p = cc;
+    }
+
+    if (nr <= 0)
+	return p;
+
+    sprintf((char *)buf, "%s %3d", (char *)p, nr);
+    return buf;
+}
+
+/*
+ * When "split" is FALSE: Open the entry/result under the cursor.
+ * When "split" is TRUE: Open the entry/result under the cursor in a new window.
+ */
+    void
+qf_view_result(int split)
+{
+    qf_info_T   *qi = &ql_info;
+
+    if (IS_LL_WINDOW(curwin))
+	qi = GET_LOC_LIST(curwin);
+
+    if (qf_list_empty(qf_get_curlist(qi)))
+    {
+	emsg(_(e_no_errors));
+	return;
+    }
+
+    if (split)
+    {
+	// Open the selected entry in a new window
+	qf_jump_newwin(qi, 0, (long)curwin->w_cursor.lnum, FALSE, TRUE);
+	do_cmdline_cmd((char_u *) "clearjumps");
+	return;
+    }
+
+    do_cmdline_cmd((char_u *)(IS_LL_WINDOW(curwin) ? ".ll" : ".cc"));
+}
+
+/*
+ * ":cwindow": open the quickfix window if we have errors to display,
+ *	       close it if not.
+ * ":lwindow": open the location list window if we have locations to display,
+ *	       close it if not.
+ */
+    void
+ex_cwindow(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    qf_list_T	*qfl;
+    win_T	*win;
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    qfl = qf_get_curlist(qi);
+
+    // Look for an existing quickfix window.
+    win = qf_find_win(qi);
+
+    // If a quickfix window is open but we have no errors to display,
+    // close the window.  If a quickfix window is not open, then open
+    // it if we have errors; otherwise, leave it closed.
+    if (qf_stack_empty(qi)
+	    || qfl->qf_nonevalid
+	    || qf_list_empty(qfl))
+    {
+	if (win != NULL)
+	    ex_cclose(eap);
+    }
+    else if (win == NULL)
+	ex_copen(eap);
+}
+
+/*
+ * ":cclose": close the window showing the list of errors.
+ * ":lclose": close the window showing the location list
+ */
+    void
+ex_cclose(exarg_T *eap)
+{
+    win_T	*win = NULL;
+    qf_info_T	*qi;
+
+    if ((qi = qf_cmd_get_stack(eap, FALSE)) == NULL)
+	return;
+
+    // Find existing quickfix window and close it.
+    win = qf_find_win(qi);
+    if (win != NULL)
+	win_close(win, FALSE);
+}
+
+/*
+ * Set "w:quickfix_title" if "qi" has a title.
+ */
+    static void
+qf_set_title_var(qf_list_T *qfl)
+{
+    if (qfl->qf_title != NULL)
+	set_internal_string_var((char_u *)"w:quickfix_title", qfl->qf_title);
+}
+
+/*
+ * Goto a quickfix or location list window (if present).
+ * Returns OK if the window is found, FAIL otherwise.
+ */
+    static int
+qf_goto_cwindow(qf_info_T *qi, int resize, int sz, int vertsplit)
+{
+    win_T	*win;
+
+    win = qf_find_win(qi);
+    if (win == NULL)
+	return FAIL;
+
+    win_goto(win);
+    if (resize)
+    {
+	if (vertsplit)
+	{
+	    if (sz != win->w_width)
+		win_setwidth(sz);
+	}
+	else if (sz != win->w_height && win->w_height
+		       + win->w_status_height + tabline_height() < cmdline_row)
+	    win_setheight(sz);
+    }
+
+    return OK;
+}
+
+/*
+ * Set options for the buffer in the quickfix or location list window.
+ */
+    static void
+qf_set_cwindow_options(void)
+{
+    // switch off 'swapfile'
+    set_option_value_give_err((char_u *)"swf", 0L, NULL, OPT_LOCAL);
+    set_option_value_give_err((char_u *)"bt",
+					  0L, (char_u *)"quickfix", OPT_LOCAL);
+    set_option_value_give_err((char_u *)"bh", 0L, (char_u *)"hide", OPT_LOCAL);
+    RESET_BINDING(curwin);
+#ifdef FEAT_DIFF
+    curwin->w_p_diff = FALSE;
+#endif
+#ifdef FEAT_FOLDING
+    set_option_value_give_err((char_u *)"fdm", 0L, (char_u *)"manual",
+	    OPT_LOCAL);
+#endif
+}
+
+/*
+ * Open a new quickfix or location list window, load the quickfix buffer and
+ * set the appropriate options for the window.
+ * Returns FAIL if the window could not be opened.
+ */
+    static int
+qf_open_new_cwindow(qf_info_T *qi, int height)
+{
+    buf_T	*qf_buf;
+    win_T	*oldwin = curwin;
+    tabpage_T	*prevtab = curtab;
+    int		flags = 0;
+    win_T	*win;
+
+    qf_buf = qf_find_buf(qi);
+
+    // The current window becomes the previous window afterwards.
+    win = curwin;
+
+    if (IS_QF_STACK(qi) && cmdmod.cmod_split == 0)
+	// Create the new quickfix window at the very bottom, except when
+	// :belowright or :aboveleft is used.
+	win_goto(lastwin);
+    // Default is to open the window below the current window
+    if (cmdmod.cmod_split == 0)
+	flags = WSP_BELOW;
+    flags |= WSP_NEWLOC;
+    if (win_split(height, flags) == FAIL)
+	return FAIL;		// not enough room for window
+    RESET_BINDING(curwin);
+
+    if (IS_LL_STACK(qi))
+    {
+	// For the location list window, create a reference to the
+	// location list stack from the window 'win'.
+	curwin->w_llist_ref = qi;
+	qi->qf_refcount++;
+    }
+
+    if (oldwin != curwin)
+	oldwin = NULL;  // don't store info when in another window
+    if (qf_buf != NULL)
+    {
+	// Use the existing quickfix buffer
+	if (do_ecmd(qf_buf->b_fnum, NULL, NULL, NULL, ECMD_ONE,
+		    ECMD_HIDE + ECMD_OLDBUF + ECMD_NOWINENTER, oldwin) == FAIL)
+	    return FAIL;
+    }
+    else
+    {
+	// Create a new quickfix buffer
+	if (do_ecmd(0, NULL, NULL, NULL, ECMD_ONE, ECMD_HIDE + ECMD_NOWINENTER,
+							       oldwin) == FAIL)
+	    return FAIL;
+
+	// save the number of the new buffer
+	qi->qf_bufnr = curbuf->b_fnum;
+    }
+
+    // Set the options for the quickfix buffer/window (if not already done)
+    // Do this even if the quickfix buffer was already present, as an autocmd
+    // might have previously deleted (:bdelete) the quickfix buffer.
+    if (!bt_quickfix(curbuf))
+	qf_set_cwindow_options();
+
+    // Only set the height when still in the same tab page and there is no
+    // window to the side.
+    if (curtab == prevtab && curwin->w_width == Columns)
+	win_setheight(height);
+    curwin->w_p_wfh = TRUE;	    // set 'winfixheight'
+    if (win_valid(win))
+	prevwin = win;
+
+    return OK;
+}
+
+/*
+ * ":copen": open a window that shows the list of errors.
+ * ":lopen": open a window that shows the location list.
+ */
+    void
+ex_copen(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    qf_list_T	*qfl;
+    int		height;
+    int		status = FAIL;
+    int		lnum;
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    incr_quickfix_busy();
+
+    if (eap->addr_count != 0)
+	height = eap->line2;
+    else
+	height = QF_WINHEIGHT;
+
+    reset_VIsual_and_resel();			// stop Visual mode
+#ifdef FEAT_GUI
+    need_mouse_correct = TRUE;
+#endif
+
+    // Find an existing quickfix window, or open a new one.
+    if (cmdmod.cmod_tab == 0)
+	status = qf_goto_cwindow(qi, eap->addr_count != 0, height,
+						cmdmod.cmod_split & WSP_VERT);
+    if (status == FAIL)
+	if (qf_open_new_cwindow(qi, height) == FAIL)
+	{
+	    decr_quickfix_busy();
+	    return;
+	}
+
+    qfl = qf_get_curlist(qi);
+    qf_set_title_var(qfl);
+    // Save the current index here, as updating the quickfix buffer may free
+    // the quickfix list
+    lnum = qfl->qf_index;
+
+    // Fill the buffer with the quickfix list.
+    qf_fill_buffer(qfl, curbuf, NULL, curwin->w_id);
+
+    decr_quickfix_busy();
+
+    curwin->w_cursor.lnum = lnum;
+    curwin->w_cursor.col = 0;
+    check_cursor();
+    update_topline();		// scroll to show the line
+}
+
+/*
+ * Move the cursor in the quickfix window to "lnum".
+ */
+    static void
+qf_win_goto(win_T *win, linenr_T lnum)
+{
+    win_T	*old_curwin = curwin;
+
+    curwin = win;
+    curbuf = win->w_buffer;
+    curwin->w_cursor.lnum = lnum;
+    curwin->w_cursor.col = 0;
+    curwin->w_cursor.coladd = 0;
+    curwin->w_curswant = 0;
+    update_topline();		// scroll to show the line
+    redraw_later(UPD_VALID);
+    curwin->w_redr_status = TRUE;	// update ruler
+    curwin = old_curwin;
+    curbuf = curwin->w_buffer;
+}
+
+/*
+ * :cbottom/:lbottom commands.
+ */
+    void
+ex_cbottom(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    win_T	*win;
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    win = qf_find_win(qi);
+    if (win != NULL && win->w_cursor.lnum != win->w_buffer->b_ml.ml_line_count)
+	qf_win_goto(win, win->w_buffer->b_ml.ml_line_count);
+}
+
+/*
+ * Return the number of the current entry (line number in the quickfix
+ * window).
+ */
+     linenr_T
+qf_current_entry(win_T *wp)
+{
+    qf_info_T	*qi = &ql_info;
+
+    if (IS_LL_WINDOW(wp))
+	// In the location list window, use the referenced location list
+	qi = wp->w_llist_ref;
+
+    return qf_get_curlist(qi)->qf_index;
+}
+
+/*
+ * Update the cursor position in the quickfix window to the current error.
+ * Return TRUE if there is a quickfix window.
+ */
+    static int
+qf_win_pos_update(
+    qf_info_T	*qi,
+    int		old_qf_index)	// previous qf_index or zero
+{
+    win_T	*win;
+    int		qf_index = qf_get_curlist(qi)->qf_index;
+
+    // Put the cursor on the current error in the quickfix window, so that
+    // it's viewable.
+    win = qf_find_win(qi);
+    if (win != NULL
+	    && qf_index <= win->w_buffer->b_ml.ml_line_count
+	    && old_qf_index != qf_index)
+    {
+	if (qf_index > old_qf_index)
+	{
+	    win->w_redraw_top = old_qf_index;
+	    win->w_redraw_bot = qf_index;
+	}
+	else
+	{
+	    win->w_redraw_top = qf_index;
+	    win->w_redraw_bot = old_qf_index;
+	}
+	qf_win_goto(win, qf_index);
+    }
+    return win != NULL;
+}
+
+/*
+ * Check whether the given window is displaying the specified quickfix/location
+ * stack.
+ */
+    static int
+is_qf_win(win_T *win, qf_info_T *qi)
+{
+    // A window displaying the quickfix buffer will have the w_llist_ref field
+    // set to NULL.
+    // A window displaying a location list buffer will have the w_llist_ref
+    // pointing to the location list.
+    if (bt_quickfix(win->w_buffer))
+	if ((IS_QF_STACK(qi) && win->w_llist_ref == NULL)
+		|| (IS_LL_STACK(qi) && win->w_llist_ref == qi))
+	    return TRUE;
+
+    return FALSE;
+}
+
+/*
+ * Find a window displaying the quickfix/location stack 'qi' in the current tab
+ * page.
+ */
+    static win_T *
+qf_find_win(qf_info_T *qi)
+{
+    win_T	*win;
+
+    FOR_ALL_WINDOWS(win)
+	if (is_qf_win(win, qi))
+	    return win;
+    return NULL;
+}
+
+/*
+ * Find a quickfix buffer.
+ * Searches in windows opened in all the tab pages.
+ */
+    static buf_T *
+qf_find_buf(qf_info_T *qi)
+{
+    tabpage_T	*tp;
+    win_T	*win;
+
+    if (qi->qf_bufnr != INVALID_QFBUFNR)
+    {
+	buf_T	*qfbuf;
+	qfbuf = buflist_findnr(qi->qf_bufnr);
+	if (qfbuf != NULL)
+	    return qfbuf;
+	// buffer is no longer present
+	qi->qf_bufnr = INVALID_QFBUFNR;
+    }
+
+    FOR_ALL_TAB_WINDOWS(tp, win)
+	if (is_qf_win(win, qi))
+	    return win->w_buffer;
+
+    return NULL;
+}
+
+/*
+ * Process the 'quickfixtextfunc' option value.
+ * Returns OK or FAIL.
+ */
+    char *
+did_set_quickfixtextfunc(optset_T *args UNUSED)
+{
+    if (option_set_callback_func(p_qftf, &qftf_cb) == FAIL)
+	return e_invalid_argument;
+
+    return NULL;
+}
+
+/*
+ * Update the w:quickfix_title variable in the quickfix/location list window in
+ * all the tab pages.
+ */
+    static void
+qf_update_win_titlevar(qf_info_T *qi)
+{
+    qf_list_T	*qfl = qf_get_curlist(qi);
+    tabpage_T	*tp;
+    win_T	*win;
+    win_T	*save_curwin = curwin;
+
+    FOR_ALL_TAB_WINDOWS(tp, win)
+    {
+	if (is_qf_win(win, qi))
+	{
+	    curwin = win;
+	    qf_set_title_var(qfl);
+	}
+    }
+    curwin = save_curwin;
+}
+
+/*
+ * Find the quickfix buffer.  If it exists, update the contents.
+ */
+    static void
+qf_update_buffer(qf_info_T *qi, qfline_T *old_last)
+{
+    buf_T	*buf;
+    win_T	*win;
+    aco_save_T	aco;
+
+    // Check if a buffer for the quickfix list exists.  Update it.
+    buf = qf_find_buf(qi);
+    if (buf == NULL)
+	return;
+
+    linenr_T	old_line_count = buf->b_ml.ml_line_count;
+    int		qf_winid = 0;
+
+    if (IS_LL_STACK(qi))
+    {
+	if (curwin->w_llist == qi)
+	    win = curwin;
+	else
+	{
+	    // Find the file window (non-quickfix) with this location list
+	    win = qf_find_win_with_loclist(qi);
+	    if (win == NULL)
+		// File window is not found. Find the location list window.
+		win = qf_find_win(qi);
+	    if (win == NULL)
+		return;
+	}
+	qf_winid = win->w_id;
+    }
+
+    // autocommands may cause trouble
+    incr_quickfix_busy();
+
+    int do_fill = TRUE;
+    if (old_last == NULL)
+    {
+	// set curwin/curbuf to buf and save a few things
+	aucmd_prepbuf(&aco, buf);
+	if (curbuf != buf)
+	    do_fill = FALSE;  // failed to find a window for "buf"
+    }
+
+    if (do_fill)
+    {
+	qf_update_win_titlevar(qi);
+
+	qf_fill_buffer(qf_get_curlist(qi), buf, old_last, qf_winid);
+	++CHANGEDTICK(buf);
+
+	if (old_last == NULL)
+	{
+	    (void)qf_win_pos_update(qi, 0);
+
+	    // restore curwin/curbuf and a few other things
+	    aucmd_restbuf(&aco);
+	}
+    }
+
+    // Only redraw when added lines are visible.  This avoids flickering
+    // when the added lines are not visible.
+    if ((win = qf_find_win(qi)) != NULL && old_line_count < win->w_botline)
+	redraw_buf_later(buf, UPD_NOT_VALID);
+
+    // always called after incr_quickfix_busy()
+    decr_quickfix_busy();
+}
+
+/*
+ * Add an error line to the quickfix buffer.
+ */
+    static int
+qf_buf_add_line(
+	buf_T		*buf,		// quickfix window buffer
+	linenr_T	lnum,
+	qfline_T	*qfp,
+	char_u		*dirname,
+	int		first_bufline,
+	char_u		*qftf_str)
+{
+    buf_T	*errbuf;
+    garray_T	*gap;
+
+    gap = qfga_get();
+
+    // If the 'quickfixtextfunc' function returned a non-empty custom string
+    // for this entry, then use it.
+    if (qftf_str != NULL && *qftf_str != NUL)
+    {
+	ga_concat(gap, qftf_str);
+	ga_append(gap, NUL);
+    }
+    else
+    {
+	if (qfp->qf_module != NULL)
+	    ga_concat(gap, qfp->qf_module);
+	else if (qfp->qf_fnum != 0
+		&& (errbuf = buflist_findnr(qfp->qf_fnum)) != NULL
+		&& errbuf->b_fname != NULL)
+	{
+	    if (qfp->qf_type == 1)	// :helpgrep
+		ga_concat(gap, gettail(errbuf->b_fname));
+	    else
+	    {
+		// Shorten the file name if not done already.
+		// For optimization, do this only for the first entry in a
+		// buffer.
+		if (first_bufline && (errbuf->b_sfname == NULL
+				|| mch_isFullName(errbuf->b_sfname)))
+		{
+		    if (*dirname == NUL)
+			mch_dirname(dirname, MAXPATHL);
+		    shorten_buf_fname(errbuf, dirname, FALSE);
+		}
+		ga_concat(gap, errbuf->b_fname);
+	    }
+	}
+
+	ga_append(gap, '|');
+
+	if (qfp->qf_lnum > 0)
+	{
+	    qf_range_text(gap, qfp);
+	    ga_concat(gap, qf_types(qfp->qf_type, qfp->qf_nr));
+	}
+	else if (qfp->qf_pattern != NULL)
+	    qf_fmt_text(gap, qfp->qf_pattern);
+	ga_append(gap, '|');
+	ga_append(gap, ' ');
+
+	// Remove newlines and leading whitespace from the text.
+	// For an unrecognized line keep the indent, the compiler may
+	// mark a word with ^^^^.
+	qf_fmt_text(gap, gap->ga_len > 3 ? skipwhite(qfp->qf_text)
+							       : qfp->qf_text);
+    }
+
+    if (ml_append_buf(buf, lnum, gap->ga_data, gap->ga_len, FALSE) == FAIL)
+	return FAIL;
+
+    return OK;
+}
+
+/*
+ * Call the 'quickfixtextfunc' function to get the list of lines to display in
+ * the quickfix window for the entries 'start_idx' to 'end_idx'.
+ */
+    static list_T *
+call_qftf_func(qf_list_T *qfl, int qf_winid, long start_idx, long end_idx)
+{
+    callback_T	*cb = &qftf_cb;
+    list_T	*qftf_list = NULL;
+    static int	recursive = FALSE;
+
+    if (recursive)
+	return NULL;  // this doesn't work properly recursively
+    recursive = TRUE;
+
+    // If 'quickfixtextfunc' is set, then use the user-supplied function to get
+    // the text to display. Use the local value of 'quickfixtextfunc' if it is
+    // set.
+    if (qfl->qf_qftf_cb.cb_name != NULL)
+	cb = &qfl->qf_qftf_cb;
+    if (cb->cb_name != NULL)
+    {
+	typval_T	args[1];
+	dict_T		*d;
+	typval_T	rettv;
+
+	// create the dict argument
+	if ((d = dict_alloc_lock(VAR_FIXED)) == NULL)
+	{
+	    recursive = FALSE;
+	    return NULL;
+	}
+	dict_add_number(d, "quickfix", (long)IS_QF_LIST(qfl));
+	dict_add_number(d, "winid", (long)qf_winid);
+	dict_add_number(d, "id", (long)qfl->qf_id);
+	dict_add_number(d, "start_idx", start_idx);
+	dict_add_number(d, "end_idx", end_idx);
+	++d->dv_refcount;
+	args[0].v_type = VAR_DICT;
+	args[0].vval.v_dict = d;
+
+	qftf_list = NULL;
+	if (call_callback(cb, 0, &rettv, 1, args) != FAIL)
+	{
+	    if (rettv.v_type == VAR_LIST)
+	    {
+		qftf_list = rettv.vval.v_list;
+		qftf_list->lv_refcount++;
+	    }
+	    clear_tv(&rettv);
+	}
+	dict_unref(d);
+    }
+
+    recursive = FALSE;
+    return qftf_list;
+}
+
+/*
+ * Fill current buffer with quickfix errors, replacing any previous contents.
+ * curbuf must be the quickfix buffer!
+ * If "old_last" is not NULL append the items after this one.
+ * When "old_last" is NULL then "buf" must equal "curbuf"!  Because
+ * ml_delete() is used and autocommands will be triggered.
+ */
+    static void
+qf_fill_buffer(qf_list_T *qfl, buf_T *buf, qfline_T *old_last, int qf_winid)
+{
+    linenr_T	lnum;
+    qfline_T	*qfp;
+    int		old_KeyTyped = KeyTyped;
+    list_T	*qftf_list = NULL;
+    listitem_T	*qftf_li = NULL;
+
+    if (old_last == NULL)
+    {
+	if (buf != curbuf)
+	{
+	    internal_error("qf_fill_buffer()");
+	    return;
+	}
+
+	// delete all existing lines
+	while ((curbuf->b_ml.ml_flags & ML_EMPTY) == 0)
+	    (void)ml_delete((linenr_T)1);
+    }
+
+    // Check if there is anything to display
+    if (qfl != NULL && qfl->qf_start != NULL)
+    {
+	char_u		dirname[MAXPATHL];
+	int		invalid_val = FALSE;
+	int		prev_bufnr = -1;
+
+	*dirname = NUL;
+
+	// Add one line for each error
+	if (old_last == NULL)
+	{
+	    qfp = qfl->qf_start;
+	    lnum = 0;
+	}
+	else
+	{
+	    if (old_last->qf_next != NULL)
+		qfp = old_last->qf_next;
+	    else
+		qfp = old_last;
+	    lnum = buf->b_ml.ml_line_count;
+	}
+
+	qftf_list = call_qftf_func(qfl, qf_winid, (long)(lnum + 1),
+							(long)qfl->qf_count);
+	if (qftf_list != NULL)
+	    qftf_li = qftf_list->lv_first;
+
+	while (lnum < qfl->qf_count)
+	{
+	    char_u	*qftf_str = NULL;
+
+	    // Use the text supplied by the user defined function (if any).
+	    // If the returned value is not string, then ignore the rest
+	    // of the returned values and use the default.
+	    if (qftf_li != NULL && !invalid_val)
+	    {
+		qftf_str = tv_get_string_chk(&qftf_li->li_tv);
+		if (qftf_str == NULL)
+		    invalid_val = TRUE;
+	    }
+
+	    if (qf_buf_add_line(buf, lnum, qfp, dirname,
+			prev_bufnr != qfp->qf_fnum, qftf_str) == FAIL)
+		break;
+
+	    prev_bufnr = qfp->qf_fnum;
+	    ++lnum;
+	    qfp = qfp->qf_next;
+	    if (qfp == NULL)
+		break;
+
+	    if (qftf_li != NULL)
+		qftf_li = qftf_li->li_next;
+	}
+
+	if (old_last == NULL)
+	    // Delete the empty line which is now at the end
+	    (void)ml_delete(lnum + 1);
+
+	qfga_clear();
+    }
+
+    // correct cursor position
+    check_lnums(TRUE);
+
+    if (old_last == NULL)
+    {
+	// Set the 'filetype' to "qf" each time after filling the buffer.
+	// This resembles reading a file into a buffer, it's more logical when
+	// using autocommands.
+	++curbuf_lock;
+	set_option_value_give_err((char_u *)"ft",
+						0L, (char_u *)"qf", OPT_LOCAL);
+	curbuf->b_p_ma = FALSE;
+
+	keep_filetype = TRUE;		// don't detect 'filetype'
+	apply_autocmds(EVENT_BUFREADPOST, (char_u *)"quickfix", NULL,
+							       FALSE, curbuf);
+	apply_autocmds(EVENT_BUFWINENTER, (char_u *)"quickfix", NULL,
+							       FALSE, curbuf);
+	keep_filetype = FALSE;
+	--curbuf_lock;
+
+	// make sure it will be redrawn
+	redraw_curbuf_later(UPD_NOT_VALID);
+    }
+
+    // Restore KeyTyped, setting 'filetype' may reset it.
+    KeyTyped = old_KeyTyped;
+}
+
+/*
+ * For every change made to the quickfix list, update the changed tick.
+ */
+    static void
+qf_list_changed(qf_list_T *qfl)
+{
+    qfl->qf_changedtick++;
+}
+
+/*
+ * Return the quickfix/location list number with the given identifier.
+ * Returns -1 if list is not found.
+ */
+    static int
+qf_id2nr(qf_info_T *qi, int_u qfid)
+{
+    int		qf_idx;
+
+    for (qf_idx = 0; qf_idx < qi->qf_listcount; qf_idx++)
+	if (qi->qf_lists[qf_idx].qf_id == qfid)
+	    return qf_idx;
+    return INVALID_QFIDX;
+}
+
+/*
+ * If the current list is not "save_qfid" and we can find the list with that ID
+ * then make it the current list.
+ * This is used when autocommands may have changed the current list.
+ * Returns OK if successfully restored the list. Returns FAIL if the list with
+ * the specified identifier (save_qfid) is not found in the stack.
+ */
+    static int
+qf_restore_list(qf_info_T *qi, int_u save_qfid)
+{
+    int curlist;
+
+    if (qf_get_curlist(qi)->qf_id == save_qfid)
+	return OK;
+
+    curlist = qf_id2nr(qi, save_qfid);
+    if (curlist < 0)
+	// list is not present
+	return FAIL;
+    qi->qf_curlist = curlist;
+    return OK;
+}
+
+/*
+ * Jump to the first entry if there is one.
+ */
+    static void
+qf_jump_first(qf_info_T *qi, int_u save_qfid, int forceit)
+{
+    if (qf_restore_list(qi, save_qfid) == FAIL)
+	return;
+
+    // Autocommands might have cleared the list, check for that.
+    if (!qf_list_empty(qf_get_curlist(qi)))
+	qf_jump(qi, 0, 0, forceit);
+}
+
+/*
+ * Return TRUE when using ":vimgrep" for ":grep".
+ */
+    int
+grep_internal(cmdidx_T cmdidx)
+{
+    return ((cmdidx == CMD_grep
+		|| cmdidx == CMD_lgrep
+		|| cmdidx == CMD_grepadd
+		|| cmdidx == CMD_lgrepadd)
+	    && STRCMP("internal",
+			*curbuf->b_p_gp == NUL ? p_gp : curbuf->b_p_gp) == 0);
+}
+
+/*
+ * Return the make/grep autocmd name.
+ */
+    static char_u *
+make_get_auname(cmdidx_T cmdidx)
+{
+    switch (cmdidx)
+    {
+	case CMD_make:	    return (char_u *)"make";
+	case CMD_lmake:	    return (char_u *)"lmake";
+	case CMD_grep:	    return (char_u *)"grep";
+	case CMD_lgrep:	    return (char_u *)"lgrep";
+	case CMD_grepadd:   return (char_u *)"grepadd";
+	case CMD_lgrepadd:  return (char_u *)"lgrepadd";
+	default: return NULL;
+    }
+}
+
+/*
+ * Return the name for the errorfile, in allocated memory.
+ * Find a new unique name when 'makeef' contains "##".
+ * Returns NULL for error.
+ */
+    static char_u *
+get_mef_name(void)
+{
+    char_u	*p;
+    char_u	*name;
+    static int	start = -1;
+    static int	off = 0;
+#ifdef HAVE_LSTAT
+    stat_T	sb;
+#endif
+
+    if (*p_mef == NUL)
+    {
+	name = vim_tempname('e', FALSE);
+	if (name == NULL)
+	    emsg(_(e_cant_get_temp_file_name));
+	return name;
+    }
+
+    for (p = p_mef; *p; ++p)
+	if (p[0] == '#' && p[1] == '#')
+	    break;
+
+    if (*p == NUL)
+	return vim_strsave(p_mef);
+
+    // Keep trying until the name doesn't exist yet.
+    for (;;)
+    {
+	if (start == -1)
+	    start = mch_get_pid();
+	else
+	    off += 19;
+
+	name = alloc_id(STRLEN(p_mef) + 30, aid_qf_mef_name);
+	if (name == NULL)
+	    break;
+	STRCPY(name, p_mef);
+	sprintf((char *)name + (p - p_mef), "%d%d", start, off);
+	STRCAT(name, p + 2);
+	if (mch_getperm(name) < 0
+#ifdef HAVE_LSTAT
+		    // Don't accept a symbolic link, it's a security risk.
+		    && mch_lstat((char *)name, &sb) < 0
+#endif
+		)
+	    break;
+	vim_free(name);
+    }
+    return name;
+}
+
+/*
+ * Form the complete command line to invoke 'make'/'grep'. Quote the command
+ * using 'shellquote' and append 'shellpipe'. Echo the fully formed command.
+ */
+    static char_u *
+make_get_fullcmd(char_u *makecmd, char_u *fname)
+{
+    char_u	*cmd;
+    unsigned	len;
+
+    len = (unsigned)STRLEN(p_shq) * 2 + (unsigned)STRLEN(makecmd) + 1;
+    if (*p_sp != NUL)
+	len += (unsigned)STRLEN(p_sp) + (unsigned)STRLEN(fname) + 3;
+    cmd = alloc_id(len, aid_qf_makecmd);
+    if (cmd == NULL)
+	return NULL;
+    sprintf((char *)cmd, "%s%s%s", (char *)p_shq, (char *)makecmd,
+							       (char *)p_shq);
+
+    // If 'shellpipe' empty: don't redirect to 'errorfile'.
+    if (*p_sp != NUL)
+	append_redir(cmd, len, p_sp, fname);
+
+    // Display the fully formed command.  Output a newline if there's something
+    // else than the :make command that was typed (in which case the cursor is
+    // in column 0).
+    if (msg_col == 0)
+	msg_didout = FALSE;
+    msg_start();
+    msg_puts(":!");
+    msg_outtrans(cmd);		// show what we are doing
+
+    return cmd;
+}
+
+/*
+ * Used for ":make", ":lmake", ":grep", ":lgrep", ":grepadd", and ":lgrepadd"
+ */
+    void
+ex_make(exarg_T *eap)
+{
+    char_u	*fname;
+    char_u	*cmd;
+    char_u	*enc = NULL;
+    win_T	*wp = NULL;
+    qf_info_T	*qi = &ql_info;
+    int		res;
+    char_u	*au_name = NULL;
+    int_u	save_qfid;
+    char_u	*errorformat = p_efm;
+    int		newlist = TRUE;
+
+    // Redirect ":grep" to ":vimgrep" if 'grepprg' is "internal".
+    if (grep_internal(eap->cmdidx))
+    {
+	ex_vimgrep(eap);
+	return;
+    }
+
+    au_name = make_get_auname(eap->cmdidx);
+    if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
+					       curbuf->b_fname, TRUE, curbuf))
+    {
+#ifdef FEAT_EVAL
+	if (aborting())
+	    return;
+#endif
+    }
+    enc = (*curbuf->b_p_menc != NUL) ? curbuf->b_p_menc : p_menc;
+
+    if (is_loclist_cmd(eap->cmdidx))
+	wp = curwin;
+
+    autowrite_all();
+    fname = get_mef_name();
+    if (fname == NULL)
+	return;
+    mch_remove(fname);	    // in case it's not unique
+
+    cmd = make_get_fullcmd(eap->arg, fname);
+    if (cmd == NULL)
+    {
+	vim_free(fname);
+	return;
+    }
+
+    // let the shell know if we are redirecting output or not
+    do_shell(cmd, *p_sp != NUL ? SHELL_DOOUT : 0);
+
+#ifdef AMIGA
+    out_flush();
+		// read window status report and redraw before message
+    (void)char_avail();
+#endif
+
+    incr_quickfix_busy();
+
+    if (eap->cmdidx != CMD_make && eap->cmdidx != CMD_lmake)
+	errorformat = p_gefm;
+    if (eap->cmdidx == CMD_grepadd || eap->cmdidx == CMD_lgrepadd)
+	newlist = FALSE;
+
+    res = qf_init(wp, fname, errorformat, newlist, qf_cmdtitle(*eap->cmdlinep),
+									enc);
+    if (wp != NULL)
+    {
+	qi = GET_LOC_LIST(wp);
+	if (qi == NULL)
+	    goto cleanup;
+    }
+    if (res >= 0)
+	qf_list_changed(qf_get_curlist(qi));
+
+    // Remember the current quickfix list identifier, so that we can
+    // check for autocommands changing the current quickfix list.
+    save_qfid = qf_get_curlist(qi)->qf_id;
+    if (au_name != NULL)
+	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
+					       curbuf->b_fname, TRUE, curbuf);
+    if (res > 0 && !eap->forceit && qflist_valid(wp, save_qfid))
+	// display the first error
+	qf_jump_first(qi, save_qfid, FALSE);
+
+cleanup:
+    decr_quickfix_busy();
+    mch_remove(fname);
+    vim_free(fname);
+    vim_free(cmd);
+}
+
+/*
+ * Returns the number of entries in the current quickfix/location list.
+ */
+    int
+qf_get_size(exarg_T *eap)
+{
+    qf_info_T	*qi;
+
+    if ((qi = qf_cmd_get_stack(eap, FALSE)) == NULL)
+	return 0;
+    return qf_get_curlist(qi)->qf_count;
+}
+
+/*
+ * Returns the number of valid entries in the current quickfix/location list.
+ */
+    int
+qf_get_valid_size(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    qf_list_T	*qfl;
+    qfline_T	*qfp;
+    int		i, sz = 0;
+    int		prev_fnum = 0;
+
+    if ((qi = qf_cmd_get_stack(eap, FALSE)) == NULL)
+	return 0;
+
+    qfl = qf_get_curlist(qi);
+    FOR_ALL_QFL_ITEMS(qfl, qfp, i)
+    {
+	if (qfp->qf_valid)
+	{
+	    if (eap->cmdidx == CMD_cdo || eap->cmdidx == CMD_ldo)
+		sz++;	// Count all valid entries
+	    else if (qfp->qf_fnum > 0 && qfp->qf_fnum != prev_fnum)
+	    {
+		// Count the number of files
+		sz++;
+		prev_fnum = qfp->qf_fnum;
+	    }
+	}
+    }
+
+    return sz;
+}
+
+/*
+ * Returns the current index of the quickfix/location list.
+ * Returns 0 if there is an error.
+ */
+    int
+qf_get_cur_idx(exarg_T *eap)
+{
+    qf_info_T	*qi;
+
+    if ((qi = qf_cmd_get_stack(eap, FALSE)) == NULL)
+	return 0;
+
+    return qf_get_curlist(qi)->qf_index;
+}
+
+/*
+ * Returns the current index in the quickfix/location list (counting only valid
+ * entries). If no valid entries are in the list, then returns 1.
+ */
+    int
+qf_get_cur_valid_idx(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    qf_list_T	*qfl;
+    qfline_T	*qfp;
+    int		i, eidx = 0;
+    int		prev_fnum = 0;
+
+    if ((qi = qf_cmd_get_stack(eap, FALSE)) == NULL)
+	return 1;
+
+    qfl = qf_get_curlist(qi);
+    qfp = qfl->qf_start;
+
+    // check if the list has valid errors
+    if (!qf_list_has_valid_entries(qfl))
+	return 1;
+
+    for (i = 1; i <= qfl->qf_index && qfp!= NULL; i++, qfp = qfp->qf_next)
+    {
+	if (qfp->qf_valid)
+	{
+	    if (eap->cmdidx == CMD_cfdo || eap->cmdidx == CMD_lfdo)
+	    {
+		if (qfp->qf_fnum > 0 && qfp->qf_fnum != prev_fnum)
+		{
+		    // Count the number of files
+		    eidx++;
+		    prev_fnum = qfp->qf_fnum;
+		}
+	    }
+	    else
+		eidx++;
+	}
+    }
+
+    return eidx ? eidx : 1;
+}
+
+/*
+ * Get the 'n'th valid error entry in the quickfix or location list.
+ * Used by :cdo, :ldo, :cfdo and :lfdo commands.
+ * For :cdo and :ldo returns the 'n'th valid error entry.
+ * For :cfdo and :lfdo returns the 'n'th valid file entry.
+ */
+    static int
+qf_get_nth_valid_entry(qf_list_T *qfl, int n, int fdo)
+{
+    qfline_T	*qfp;
+    int		i, eidx;
+    int		prev_fnum = 0;
+
+    // check if the list has valid errors
+    if (!qf_list_has_valid_entries(qfl))
+	return 1;
+
+    eidx = 0;
+    FOR_ALL_QFL_ITEMS(qfl, qfp, i)
+    {
+	if (qfp->qf_valid)
+	{
+	    if (fdo)
+	    {
+		if (qfp->qf_fnum > 0 && qfp->qf_fnum != prev_fnum)
+		{
+		    // Count the number of files
+		    eidx++;
+		    prev_fnum = qfp->qf_fnum;
+		}
+	    }
+	    else
+		eidx++;
+	}
+
+	if (eidx == n)
+	    break;
+    }
+
+    if (i <= qfl->qf_count)
+	return i;
+    else
+	return 1;
+}
+
+/*
+ * ":cc", ":crewind", ":cfirst" and ":clast".
+ * ":ll", ":lrewind", ":lfirst" and ":llast".
+ * ":cdo", ":ldo", ":cfdo" and ":lfdo"
+ */
+    void
+ex_cc(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    int		errornr;
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    if (eap->addr_count > 0)
+	errornr = (int)eap->line2;
+    else
+    {
+	switch (eap->cmdidx)
+	{
+	    case CMD_cc: case CMD_ll:
+		errornr = 0;
+		break;
+	    case CMD_crewind: case CMD_lrewind: case CMD_cfirst:
+	    case CMD_lfirst:
+		errornr = 1;
+		break;
+	    default:
+		errornr = 32767;
+	}
+    }
+
+    // For cdo and ldo commands, jump to the nth valid error.
+    // For cfdo and lfdo commands, jump to the nth valid file entry.
+    if (eap->cmdidx == CMD_cdo || eap->cmdidx == CMD_ldo
+	    || eap->cmdidx == CMD_cfdo || eap->cmdidx == CMD_lfdo)
+	errornr = qf_get_nth_valid_entry(qf_get_curlist(qi),
+		eap->addr_count > 0 ? (int)eap->line1 : 1,
+		eap->cmdidx == CMD_cfdo || eap->cmdidx == CMD_lfdo);
+
+    qf_jump(qi, 0, errornr, eap->forceit);
+}
+
+/*
+ * ":cnext", ":cnfile", ":cNext" and ":cprevious".
+ * ":lnext", ":lNext", ":lprevious", ":lnfile", ":lNfile" and ":lpfile".
+ * Also, used by ":cdo", ":ldo", ":cfdo" and ":lfdo" commands.
+ */
+    void
+ex_cnext(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    int		errornr;
+    int		dir;
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    if (eap->addr_count > 0
+	    && (eap->cmdidx != CMD_cdo && eap->cmdidx != CMD_ldo
+		&& eap->cmdidx != CMD_cfdo && eap->cmdidx != CMD_lfdo))
+	errornr = (int)eap->line2;
+    else
+	errornr = 1;
+
+    // Depending on the command jump to either next or previous entry/file.
+    switch (eap->cmdidx)
+    {
+	case CMD_cnext: case CMD_lnext: case CMD_cdo: case CMD_ldo:
+	    dir = FORWARD;
+	    break;
+	case CMD_cprevious: case CMD_lprevious: case CMD_cNext:
+	case CMD_lNext:
+	    dir = BACKWARD;
+	    break;
+	case CMD_cnfile: case CMD_lnfile: case CMD_cfdo: case CMD_lfdo:
+	    dir = FORWARD_FILE;
+	    break;
+	case CMD_cpfile: case CMD_lpfile: case CMD_cNfile: case CMD_lNfile:
+	    dir = BACKWARD_FILE;
+	    break;
+	default:
+	    dir = FORWARD;
+	    break;
+    }
+
+    qf_jump(qi, dir, errornr, eap->forceit);
+}
+
+/*
+ * Find the first entry in the quickfix list 'qfl' from buffer 'bnr'.
+ * The index of the entry is stored in 'errornr'.
+ * Returns NULL if an entry is not found.
+ */
+    static qfline_T *
+qf_find_first_entry_in_buf(qf_list_T *qfl, int bnr, int *errornr)
+{
+    qfline_T	*qfp = NULL;
+    int		idx = 0;
+
+    // Find the first entry in this file
+    FOR_ALL_QFL_ITEMS(qfl, qfp, idx)
+	if (qfp->qf_fnum == bnr)
+	    break;
+
+    *errornr = idx;
+    return qfp;
+}
+
+/*
+ * Find the first quickfix entry on the same line as 'entry'. Updates 'errornr'
+ * with the error number for the first entry. Assumes the entries are sorted in
+ * the quickfix list by line number.
+ */
+    static qfline_T *
+qf_find_first_entry_on_line(qfline_T *entry, int *errornr)
+{
+    while (!got_int
+	    && entry->qf_prev != NULL
+	    && entry->qf_fnum == entry->qf_prev->qf_fnum
+	    && entry->qf_lnum == entry->qf_prev->qf_lnum)
+    {
+	entry = entry->qf_prev;
+	--*errornr;
+    }
+
+    return entry;
+}
+
+/*
+ * Find the last quickfix entry on the same line as 'entry'. Updates 'errornr'
+ * with the error number for the last entry. Assumes the entries are sorted in
+ * the quickfix list by line number.
+ */
+    static qfline_T *
+qf_find_last_entry_on_line(qfline_T *entry, int *errornr)
+{
+    while (!got_int &&
+	    entry->qf_next != NULL
+	    && entry->qf_fnum == entry->qf_next->qf_fnum
+	    && entry->qf_lnum == entry->qf_next->qf_lnum)
+    {
+	entry = entry->qf_next;
+	++*errornr;
+    }
+
+    return entry;
+}
+
+/*
+ * Returns TRUE if the specified quickfix entry is
+ *   after the given line (linewise is TRUE)
+ *   or after the line and column.
+ */
+    static int
+qf_entry_after_pos(qfline_T *qfp, pos_T *pos, int linewise)
+{
+    if (linewise)
+	return qfp->qf_lnum > pos->lnum;
+    else
+	return (qfp->qf_lnum > pos->lnum ||
+		(qfp->qf_lnum == pos->lnum && qfp->qf_col > pos->col));
+}
+
+/*
+ * Returns TRUE if the specified quickfix entry is
+ *   before the given line (linewise is TRUE)
+ *   or before the line and column.
+ */
+    static int
+qf_entry_before_pos(qfline_T *qfp, pos_T *pos, int linewise)
+{
+    if (linewise)
+	return qfp->qf_lnum < pos->lnum;
+    else
+	return (qfp->qf_lnum < pos->lnum ||
+		(qfp->qf_lnum == pos->lnum && qfp->qf_col < pos->col));
+}
+
+/*
+ * Returns TRUE if the specified quickfix entry is
+ *   on or after the given line (linewise is TRUE)
+ *   or on or after the line and column.
+ */
+    static int
+qf_entry_on_or_after_pos(qfline_T *qfp, pos_T *pos, int linewise)
+{
+    if (linewise)
+	return qfp->qf_lnum >= pos->lnum;
+    else
+	return (qfp->qf_lnum > pos->lnum ||
+		(qfp->qf_lnum == pos->lnum && qfp->qf_col >= pos->col));
+}
+
+/*
+ * Returns TRUE if the specified quickfix entry is
+ *   on or before the given line (linewise is TRUE)
+ *   or on or before the line and column.
+ */
+    static int
+qf_entry_on_or_before_pos(qfline_T *qfp, pos_T *pos, int linewise)
+{
+    if (linewise)
+	return qfp->qf_lnum <= pos->lnum;
+    else
+	return (qfp->qf_lnum < pos->lnum ||
+		(qfp->qf_lnum == pos->lnum && qfp->qf_col <= pos->col));
+}
+
+/*
+ * Find the first quickfix entry after position 'pos' in buffer 'bnr'.
+ * If 'linewise' is TRUE, returns the entry after the specified line and treats
+ * multiple entries on a single line as one. Otherwise returns the entry after
+ * the specified line and column.
+ * 'qfp' points to the very first entry in the buffer and 'errornr' is the
+ * index of the very first entry in the quickfix list.
+ * Returns NULL if an entry is not found after 'pos'.
+ */
+    static qfline_T *
+qf_find_entry_after_pos(
+	int		bnr,
+	pos_T		*pos,
+	int		linewise,
+	qfline_T	*qfp,
+	int		*errornr)
+{
+    if (qf_entry_after_pos(qfp, pos, linewise))
+	// First entry is after position 'pos'
+	return qfp;
+
+    // Find the entry just before or at the position 'pos'
+    while (qfp->qf_next != NULL
+	    && qfp->qf_next->qf_fnum == bnr
+	    && qf_entry_on_or_before_pos(qfp->qf_next, pos, linewise))
+    {
+	qfp = qfp->qf_next;
+	++*errornr;
+    }
+
+    if (qfp->qf_next == NULL || qfp->qf_next->qf_fnum != bnr)
+	// No entries found after position 'pos'
+	return NULL;
+
+    // Use the entry just after position 'pos'
+    qfp = qfp->qf_next;
+    ++*errornr;
+
+    return qfp;
+}
+
+/*
+ * Find the first quickfix entry before position 'pos' in buffer 'bnr'.
+ * If 'linewise' is TRUE, returns the entry before the specified line and
+ * treats multiple entries on a single line as one. Otherwise returns the entry
+ * before the specified line and column.
+ * 'qfp' points to the very first entry in the buffer and 'errornr' is the
+ * index of the very first entry in the quickfix list.
+ * Returns NULL if an entry is not found before 'pos'.
+ */
+    static qfline_T *
+qf_find_entry_before_pos(
+	int		bnr,
+	pos_T		*pos,
+	int		linewise,
+	qfline_T	*qfp,
+	int		*errornr)
+{
+    // Find the entry just before the position 'pos'
+    while (qfp->qf_next != NULL
+	    && qfp->qf_next->qf_fnum == bnr
+	    && qf_entry_before_pos(qfp->qf_next, pos, linewise))
+    {
+	qfp = qfp->qf_next;
+	++*errornr;
+    }
+
+    if (qf_entry_on_or_after_pos(qfp, pos, linewise))
+	return NULL;
+
+    if (linewise)
+	// If multiple entries are on the same line, then use the first entry
+	qfp = qf_find_first_entry_on_line(qfp, errornr);
+
+    return qfp;
+}
+
+/*
+ * Find a quickfix entry in 'qfl' closest to position 'pos' in buffer 'bnr' in
+ * the direction 'dir'.
+ */
+    static qfline_T *
+qf_find_closest_entry(
+	qf_list_T	*qfl,
+	int		bnr,
+	pos_T		*pos,
+	int		dir,
+	int		linewise,
+	int		*errornr)
+{
+    qfline_T	*qfp;
+
+    *errornr = 0;
+
+    // Find the first entry in this file
+    qfp = qf_find_first_entry_in_buf(qfl, bnr, errornr);
+    if (qfp == NULL)
+	return NULL;		// no entry in this file
+
+    if (dir == FORWARD)
+	qfp = qf_find_entry_after_pos(bnr, pos, linewise, qfp, errornr);
+    else
+	qfp = qf_find_entry_before_pos(bnr, pos, linewise, qfp, errornr);
+
+    return qfp;
+}
+
+/*
+ * Get the nth quickfix entry below the specified entry.  Searches forward in
+ * the list. If linewise is TRUE, then treat multiple entries on a single line
+ * as one.
+ */
+    static void
+qf_get_nth_below_entry(qfline_T *entry_arg, int n, int linewise, int *errornr)
+{
+    qfline_T *entry = entry_arg;
+
+    while (n-- > 0 && !got_int)
+    {
+	int		first_errornr = *errornr;
+
+	if (linewise)
+	    // Treat all the entries on the same line in this file as one
+	    entry = qf_find_last_entry_on_line(entry, errornr);
+
+	if (entry->qf_next == NULL
+		|| entry->qf_next->qf_fnum != entry->qf_fnum)
+	{
+	    if (linewise)
+		*errornr = first_errornr;
+	    break;
+	}
+
+	entry = entry->qf_next;
+	++*errornr;
+    }
+}
+
+/*
+ * Get the nth quickfix entry above the specified entry.  Searches backwards in
+ * the list. If linewise is TRUE, then treat multiple entries on a single line
+ * as one.
+ */
+    static void
+qf_get_nth_above_entry(qfline_T *entry, int n, int linewise, int *errornr)
+{
+    while (n-- > 0 && !got_int)
+    {
+	if (entry->qf_prev == NULL
+		|| entry->qf_prev->qf_fnum != entry->qf_fnum)
+	    break;
+
+	entry = entry->qf_prev;
+	--*errornr;
+
+	// If multiple entries are on the same line, then use the first entry
+	if (linewise)
+	    entry = qf_find_first_entry_on_line(entry, errornr);
+    }
+}
+
+/*
+ * Find the n'th quickfix entry adjacent to position 'pos' in buffer 'bnr' in
+ * the specified direction.  Returns the error number in the quickfix list or 0
+ * if an entry is not found.
+ */
+    static int
+qf_find_nth_adj_entry(
+	qf_list_T	*qfl,
+	int		bnr,
+	pos_T		*pos,
+	int		n,
+	int		dir,
+	int		linewise)
+{
+    qfline_T	*adj_entry;
+    int		errornr;
+
+    // Find an entry closest to the specified position
+    adj_entry = qf_find_closest_entry(qfl, bnr, pos, dir, linewise, &errornr);
+    if (adj_entry == NULL)
+	return 0;
+
+    if (--n > 0)
+    {
+	// Go to the n'th entry in the current buffer
+	if (dir == FORWARD)
+	    qf_get_nth_below_entry(adj_entry, n, linewise, &errornr);
+	else
+	    qf_get_nth_above_entry(adj_entry, n, linewise, &errornr);
+    }
+
+    return errornr;
+}
+
+/*
+ * Jump to a quickfix entry in the current file nearest to the current line or
+ * current line/col.
+ * ":cabove", ":cbelow", ":labove", ":lbelow", ":cafter", ":cbefore",
+ * ":lafter" and ":lbefore" commands
+ */
+    void
+ex_cbelow(exarg_T *eap)
+{
+    qf_info_T	*qi;
+    qf_list_T	*qfl;
+    int		dir;
+    int		buf_has_flag;
+    int		errornr = 0;
+    pos_T	pos;
+
+    if (eap->addr_count > 0 && eap->line2 <= 0)
+    {
+	emsg(_(e_invalid_range));
+	return;
+    }
+
+    // Check whether the current buffer has any quickfix entries
+    if (eap->cmdidx == CMD_cabove || eap->cmdidx == CMD_cbelow
+	    || eap->cmdidx == CMD_cbefore || eap->cmdidx == CMD_cafter)
+	buf_has_flag = BUF_HAS_QF_ENTRY;
+    else
+	buf_has_flag = BUF_HAS_LL_ENTRY;
+    if (!(curbuf->b_has_qf_entry & buf_has_flag))
+    {
+	emsg(_(e_no_errors));
+	return;
+    }
+
+    if ((qi = qf_cmd_get_stack(eap, TRUE)) == NULL)
+	return;
+
+    qfl = qf_get_curlist(qi);
+    // check if the list has valid errors
+    if (!qf_list_has_valid_entries(qfl))
+    {
+	emsg(_(e_no_errors));
+	return;
+    }
+
+    if (eap->cmdidx == CMD_cbelow
+	    || eap->cmdidx == CMD_lbelow
+	    || eap->cmdidx == CMD_cafter
+	    || eap->cmdidx == CMD_lafter)
+	// Forward motion commands
+	dir = FORWARD;
+    else
+	dir = BACKWARD;
+
+    pos = curwin->w_cursor;
+    // A quickfix entry column number is 1 based whereas cursor column
+    // number is 0 based. Adjust the column number.
+    pos.col++;
+    errornr = qf_find_nth_adj_entry(qfl, curbuf->b_fnum, &pos,
+				eap->addr_count > 0 ? eap->line2 : 0, dir,
+				eap->cmdidx == CMD_cbelow
+					|| eap->cmdidx == CMD_lbelow
+					|| eap->cmdidx == CMD_cabove
+					|| eap->cmdidx == CMD_labove);
+
+    if (errornr > 0)
+	qf_jump(qi, 0, errornr, FALSE);
+    else
+	emsg(_(e_no_more_items));
+}
+
+/*
+ * Return the autocmd name for the :cfile Ex commands
+ */
+    static char_u *
+cfile_get_auname(cmdidx_T cmdidx)
+{
+    switch (cmdidx)
+    {
+	case CMD_cfile:	    return (char_u *)"cfile";
+	case CMD_cgetfile:  return (char_u *)"cgetfile";
+	case CMD_caddfile:  return (char_u *)"caddfile";
+	case CMD_lfile:	    return (char_u *)"lfile";
+	case CMD_lgetfile:  return (char_u *)"lgetfile";
+	case CMD_laddfile:  return (char_u *)"laddfile";
+	default:	    return NULL;
+    }
+}
+
+/*
+ * ":cfile"/":cgetfile"/":caddfile" commands.
+ * ":lfile"/":lgetfile"/":laddfile" commands.
+ */
+    void
+ex_cfile(exarg_T *eap)
+{
+    char_u	*enc = NULL;
+    win_T	*wp = NULL;
+    qf_info_T	*qi = &ql_info;
+    char_u	*au_name = NULL;
+    int_u	save_qfid = 0;		// init for gcc
+    int		res;
+
+    au_name = cfile_get_auname(eap->cmdidx);
+    if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
+							NULL, FALSE, curbuf))
+    {
+#ifdef FEAT_EVAL
+	if (aborting())
+	    return;
+#endif
+    }
+
+    enc = (*curbuf->b_p_menc != NUL) ? curbuf->b_p_menc : p_menc;
+#ifdef FEAT_BROWSE
+    if (cmdmod.cmod_flags & CMOD_BROWSE)
+    {
+	char_u *browse_file = do_browse(0, (char_u *)_("Error file"), eap->arg,
+				   NULL, NULL,
+				   (char_u *)_(BROWSE_FILTER_ALL_FILES), NULL);
+	if (browse_file == NULL)
+	    return;
+	set_string_option_direct((char_u *)"ef", -1, browse_file, OPT_FREE, 0);
+	vim_free(browse_file);
+    }
+    else
+#endif
+    if (*eap->arg != NUL)
+	set_string_option_direct((char_u *)"ef", -1, eap->arg, OPT_FREE, 0);
+
+    if (is_loclist_cmd(eap->cmdidx))
+	wp = curwin;
+
+    incr_quickfix_busy();
+
+    // This function is used by the :cfile, :cgetfile and :caddfile
+    // commands.
+    // :cfile always creates a new quickfix list and jumps to the
+    // first error.
+    // :cgetfile creates a new quickfix list but doesn't jump to the
+    // first error.
+    // :caddfile adds to an existing quickfix list. If there is no
+    // quickfix list then a new list is created.
+    res = qf_init(wp, p_ef, p_efm, (eap->cmdidx != CMD_caddfile
+			&& eap->cmdidx != CMD_laddfile),
+			qf_cmdtitle(*eap->cmdlinep), enc);
+    if (wp != NULL)
+    {
+	qi = GET_LOC_LIST(wp);
+	if (qi == NULL)
+	{
+	    decr_quickfix_busy();
+	    return;
+	}
+    }
+    if (res >= 0)
+	qf_list_changed(qf_get_curlist(qi));
+    save_qfid = qf_get_curlist(qi)->qf_id;
+    if (au_name != NULL)
+	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name, NULL, FALSE, curbuf);
+
+    // Jump to the first error for a new list and if autocmds didn't
+    // free the list.
+    if (res > 0 && (eap->cmdidx == CMD_cfile || eap->cmdidx == CMD_lfile)
+	    && qflist_valid(wp, save_qfid))
+	// display the first error
+	qf_jump_first(qi, save_qfid, eap->forceit);
+
+    decr_quickfix_busy();
+}
+
+/*
+ * Return the vimgrep autocmd name.
+ */
+    static char_u *
+vgr_get_auname(cmdidx_T cmdidx)
+{
+    switch (cmdidx)
+    {
+	case CMD_vimgrep:     return (char_u *)"vimgrep";
+	case CMD_lvimgrep:    return (char_u *)"lvimgrep";
+	case CMD_vimgrepadd:  return (char_u *)"vimgrepadd";
+	case CMD_lvimgrepadd: return (char_u *)"lvimgrepadd";
+	case CMD_grep:	      return (char_u *)"grep";
+	case CMD_lgrep:	      return (char_u *)"lgrep";
+	case CMD_grepadd:     return (char_u *)"grepadd";
+	case CMD_lgrepadd:    return (char_u *)"lgrepadd";
+	default: return NULL;
+    }
+}
+
+/*
+ * Initialize the regmatch used by vimgrep for pattern "s".
+ */
+    static void
+vgr_init_regmatch(regmmatch_T *regmatch, char_u *s)
+{
+    // Get the search pattern: either white-separated or enclosed in //
+    regmatch->regprog = NULL;
+
+    if (s == NULL || *s == NUL)
+    {
+	// Pattern is empty, use last search pattern.
+	if (last_search_pat() == NULL)
+	{
+	    emsg(_(e_no_previous_regular_expression));
+	    return;
+	}
+	regmatch->regprog = vim_regcomp(last_search_pat(), RE_MAGIC);
+    }
+    else
+	regmatch->regprog = vim_regcomp(s, RE_MAGIC);
+
+    regmatch->rmm_ic = p_ic;
+    regmatch->rmm_maxcol = 0;
+}
+
+/*
+ * Display a file name when vimgrep is running.
+ */
+    static void
+vgr_display_fname(char_u *fname)
+{
+    char_u	*p;
+
+    msg_start();
+    p = msg_strtrunc(fname, TRUE);
+    if (p == NULL)
+	msg_outtrans(fname);
+    else
+    {
+	msg_outtrans(p);
+	vim_free(p);
+    }
+    msg_clr_eos();
+    msg_didout = FALSE;	    // overwrite this message
+    msg_nowait = TRUE;	    // don't wait for this message
+    msg_col = 0;
+    out_flush();
+}
+
+/*
+ * Load a dummy buffer to search for a pattern using vimgrep.
+ */
+    static buf_T *
+vgr_load_dummy_buf(
+	char_u *fname,
+	char_u *dirname_start,
+	char_u *dirname_now)
+{
+    int		save_mls;
+#if defined(FEAT_SYN_HL)
+    char_u	*save_ei = NULL;
+#endif
+    buf_T	*buf;
+
+#if defined(FEAT_SYN_HL)
+    // Don't do Filetype autocommands to avoid loading syntax and
+    // indent scripts, a great speed improvement.
+    save_ei = au_event_disable(",Filetype");
+#endif
+    // Don't use modelines here, it's useless.
+    save_mls = p_mls;
+    p_mls = 0;
+
+    // Load file into a buffer, so that 'fileencoding' is detected,
+    // autocommands applied, etc.
+    buf = load_dummy_buffer(fname, dirname_start, dirname_now);
+
+    p_mls = save_mls;
+#if defined(FEAT_SYN_HL)
+    au_event_restore(save_ei);
+#endif
+
+    return buf;
+}
+
+/*
+ * Check whether a quickfix/location list is valid. Autocmds may remove or
+ * change a quickfix list when vimgrep is running. If the list is not found,
+ * create a new list.
+ */
+    static int
+vgr_qflist_valid(
+	win_T	    *wp,
+	qf_info_T   *qi,
+	int_u	    qfid,
+	char_u	    *title)
+{
+    // Verify that the quickfix/location list was not freed by an autocmd
+    if (!qflist_valid(wp, qfid))
+    {
+	if (wp != NULL)
+	{
+	    // An autocmd has freed the location list.
+	    emsg(_(e_current_location_list_was_changed));
+	    return FALSE;
+	}
+	else
+	{
+	    // Quickfix list is not found, create a new one.
+	    qf_new_list(qi, title);
+	    return TRUE;
+	}
+    }
+
+    if (qf_restore_list(qi, qfid) == FAIL)
+	return FALSE;
+
+    return TRUE;
+}
+
+/*
+ * Search for a pattern in all the lines in a buffer and add the matching lines
+ * to a quickfix list.
+ */
+    static int
+vgr_match_buflines(
+	qf_list_T   *qfl,
+	char_u	    *fname,
+	buf_T	    *buf,
+	char_u	    *spat,
+	regmmatch_T *regmatch,
+	long	    *tomatch,
+	int	    duplicate_name,
+	int	    flags)
+{
+    int		found_match = FALSE;
+    long	lnum;
+    colnr_T	col;
+    int		pat_len = (int)STRLEN(spat);
+
+    for (lnum = 1; lnum <= buf->b_ml.ml_line_count && *tomatch > 0; ++lnum)
+    {
+	col = 0;
+	if (!(flags & VGR_FUZZY))
+	{
+	    // Regular expression match
+	    while (vim_regexec_multi(regmatch, curwin, buf, lnum,
+			col, NULL) > 0)
+	    {
+		// Pass the buffer number so that it gets used even for a
+		// dummy buffer, unless duplicate_name is set, then the
+		// buffer will be wiped out below.
+		if (qf_add_entry(qfl,
+			    NULL,	// dir
+			    fname,
+			    NULL,
+			    duplicate_name ? 0 : buf->b_fnum,
+			    ml_get_buf(buf,
+				regmatch->startpos[0].lnum + lnum, FALSE),
+			    regmatch->startpos[0].lnum + lnum,
+			    regmatch->endpos[0].lnum + lnum,
+			    regmatch->startpos[0].col + 1,
+			    regmatch->endpos[0].col + 1,
+			    FALSE,	// vis_col
+			    NULL,	// search pattern
+			    0,		// nr
+			    0,		// type
+			    TRUE	// valid
+			    ) == QF_FAIL)
+		{
+		    got_int = TRUE;
+		    break;
+		}
+		found_match = TRUE;
+		if (--*tomatch == 0)
+		    break;
+		if ((flags & VGR_GLOBAL) == 0
+			|| regmatch->endpos[0].lnum > 0)
+		    break;
+		col = regmatch->endpos[0].col
+		    + (col == regmatch->endpos[0].col);
+		if (col > (colnr_T)STRLEN(ml_get_buf(buf, lnum, FALSE)))
+		    break;
+	    }
+	}
+	else
+	{
+	    char_u  *str = ml_get_buf(buf, lnum, FALSE);
+	    int	    score;
+	    int_u   matches[MAX_FUZZY_MATCHES];
+	    int_u   sz = ARRAY_LENGTH(matches);
+
+	    // Fuzzy string match
+	    while (fuzzy_match(str + col, spat, FALSE, &score, matches, sz) > 0)
+	    {
+		// Pass the buffer number so that it gets used even for a
+		// dummy buffer, unless duplicate_name is set, then the
+		// buffer will be wiped out below.
+		if (qf_add_entry(qfl,
+			    NULL,	// dir
+			    fname,
+			    NULL,
+			    duplicate_name ? 0 : buf->b_fnum,
+			    str,
+			    lnum,
+			    0,
+			    matches[0] + col + 1,
+			    0,
+			    FALSE,	// vis_col
+			    NULL,	// search pattern
+			    0,		// nr
+			    0,		// type
+			    TRUE	// valid
+			    ) == QF_FAIL)
+		{
+		    got_int = TRUE;
+		    break;
+		}
+		found_match = TRUE;
+		if (--*tomatch == 0)
+		    break;
+		if ((flags & VGR_GLOBAL) == 0)
+		    break;
+		col = matches[pat_len - 1] + col + 1;
+		if (col > (colnr_T)STRLEN(str))
+		    break;
+	    }
+	}
+	line_breakcheck();
+	if (got_int)
+	    break;
+    }
+
+    return found_match;
+}
+
+/*
+ * Jump to the first match and update the directory.
+ */
+    static void
+vgr_jump_to_match(
+	qf_info_T   *qi,
+	int	    forceit,
+	int	    *redraw_for_dummy,
+	buf_T	    *first_match_buf,
+	char_u	    *target_dir)
+{
+    buf_T	*buf;
+
+    buf = curbuf;
+    qf_jump(qi, 0, 0, forceit);
+    if (buf != curbuf)
+	// If we jumped to another buffer redrawing will already be
+	// taken care of.
+	*redraw_for_dummy = FALSE;
+
+    // Jump to the directory used after loading the buffer.
+    if (curbuf == first_match_buf && target_dir != NULL)
+    {
+	exarg_T ea;
+
+	CLEAR_FIELD(ea);
+	ea.arg = target_dir;
+	ea.cmdidx = CMD_lcd;
+	ex_cd(&ea);
+    }
+}
+
+/*
+ * :vimgrep command arguments
+ */
+typedef struct
+{
+    long	tomatch;	// maximum number of matches to find
+    char_u	*spat;		// search pattern
+    int		flags;		// search modifier
+    char_u	**fnames;	// list of files to search
+    int		fcount;		// number of files
+    regmmatch_T	regmatch;	// compiled search pattern
+    char_u	*qf_title;	// quickfix list title
+} vgr_args_T;
+
+/*
+ * Process :vimgrep command arguments. The command syntax is:
+ *
+ *	:{count}vimgrep /{pattern}/[g][j] {file} ...
+ */
+    static int
+vgr_process_args(
+	exarg_T		*eap,
+	vgr_args_T	*args)
+{
+    char_u	*p;
+
+    vim_memset(args, 0, sizeof(*args));
+
+    args->regmatch.regprog = NULL;
+    args->qf_title = vim_strsave(qf_cmdtitle(*eap->cmdlinep));
+
+    if (eap->addr_count > 0)
+	args->tomatch = eap->line2;
+    else
+	args->tomatch = MAXLNUM;
+
+    // Get the search pattern: either white-separated or enclosed in //
+    p = skip_vimgrep_pat(eap->arg, &args->spat, &args->flags);
+    if (p == NULL)
+    {
+	emsg(_(e_invalid_search_pattern_or_delimiter));
+	return FAIL;
+    }
+
+    vgr_init_regmatch(&args->regmatch, args->spat);
+    if (args->regmatch.regprog == NULL)
+	return FAIL;
+
+    p = skipwhite(p);
+    if (*p == NUL)
+    {
+	emsg(_(e_file_name_missing_or_invalid_pattern));
+	return FAIL;
+    }
+
+    // Parse the list of arguments, wildcards have already been expanded.
+    if ((get_arglist_exp(p, &args->fcount, &args->fnames, TRUE) == FAIL) ||
+	args->fcount == 0)
+    {
+	emsg(_(e_no_match));
+	return FAIL;
+    }
+
+    return OK;
+}
+
+/*
+ * Return TRUE if "buf" had an existing swap file, the current swap file does
+ * not end in ".swp".
+ */
+    static int
+existing_swapfile(buf_T *buf)
+{
+    if (buf->b_ml.ml_mfp != NULL && buf->b_ml.ml_mfp->mf_fname != NULL)
+    {
+	char_u *fname = buf->b_ml.ml_mfp->mf_fname;
+	size_t len = STRLEN(fname);
+
+	return fname[len - 1] != 'p' || fname[len - 2] != 'w';
+    }
+    return FALSE;
+}
+
+/*
+ * Search for a pattern in a list of files and populate the quickfix list with
+ * the matches.
+ */
+    static int
+vgr_process_files(
+	win_T		*wp,
+	qf_info_T	*qi,
+	vgr_args_T	*cmd_args,
+	int		*redraw_for_dummy,
+	buf_T		**first_match_buf,
+	char_u		**target_dir)
+{
+    int		status = FAIL;
+    int_u	save_qfid = qf_get_curlist(qi)->qf_id;
+    time_t	seconds = 0;
+    char_u	*fname;
+    int		fi;
+    buf_T	*buf;
+    int		duplicate_name = FALSE;
+    int		using_dummy;
+    char_u	*dirname_start = NULL;
+    char_u	*dirname_now = NULL;
+    int		found_match;
+    aco_save_T	aco;
+
+    dirname_start = alloc_id(MAXPATHL, aid_qf_dirname_start);
+    dirname_now = alloc_id(MAXPATHL, aid_qf_dirname_now);
+    if (dirname_start == NULL || dirname_now == NULL)
+	goto theend;
+
+    // Remember the current directory, because a BufRead autocommand that does
+    // ":lcd %:p:h" changes the meaning of short path names.
+    mch_dirname(dirname_start, MAXPATHL);
+
+    seconds = (time_t)0;
+    for (fi = 0; fi < cmd_args->fcount && !got_int && cmd_args->tomatch > 0;
+									++fi)
+    {
+	fname = shorten_fname1(cmd_args->fnames[fi]);
+	if (time(NULL) > seconds)
+	{
+	    // Display the file name every second or so, show the user we are
+	    // working on it.
+	    seconds = time(NULL);
+	    vgr_display_fname(fname);
+	}
+
+	buf = buflist_findname_exp(cmd_args->fnames[fi]);
+	if (buf == NULL || buf->b_ml.ml_mfp == NULL)
+	{
+	    // Remember that a buffer with this name already exists.
+	    duplicate_name = (buf != NULL);
+	    using_dummy = TRUE;
+	    *redraw_for_dummy = TRUE;
+
+	    buf = vgr_load_dummy_buf(fname, dirname_start, dirname_now);
+	}
+	else
+	    // Use existing, loaded buffer.
+	    using_dummy = FALSE;
+
+	// Check whether the quickfix list is still valid. When loading a
+	// buffer above, autocommands might have changed the quickfix list.
+	if (!vgr_qflist_valid(wp, qi, save_qfid, cmd_args->qf_title))
+	    goto theend;
+
+	save_qfid = qf_get_curlist(qi)->qf_id;
+
+	if (buf == NULL)
+	{
+	    if (!got_int)
+		smsg(_("Cannot open file \"%s\""), fname);
+	}
+	else
+	{
+	    // Try for a match in all lines of the buffer.
+	    // For ":1vimgrep" look for first match only.
+	    found_match = vgr_match_buflines(qf_get_curlist(qi),
+		    fname, buf, cmd_args->spat, &cmd_args->regmatch,
+		    &cmd_args->tomatch, duplicate_name, cmd_args->flags);
+
+	    if (using_dummy)
+	    {
+		if (found_match && *first_match_buf == NULL)
+		    *first_match_buf = buf;
+		if (duplicate_name)
+		{
+		    // Never keep a dummy buffer if there is another buffer
+		    // with the same name.
+		    wipe_dummy_buffer(buf, dirname_start);
+		    buf = NULL;
+		}
+		else if ((cmdmod.cmod_flags & CMOD_HIDE) == 0
+			    || buf->b_p_bh[0] == 'u'	// "unload"
+			    || buf->b_p_bh[0] == 'w'	// "wipe"
+			    || buf->b_p_bh[0] == 'd')	// "delete"
+		{
+		    // When no match was found we don't need to remember the
+		    // buffer, wipe it out.  If there was a match and it
+		    // wasn't the first one or we won't jump there: only
+		    // unload the buffer.
+		    // Ignore 'hidden' here, because it may lead to having too
+		    // many swap files.
+		    if (!found_match)
+		    {
+			wipe_dummy_buffer(buf, dirname_start);
+			buf = NULL;
+		    }
+		    else if (buf != *first_match_buf
+					|| (cmd_args->flags & VGR_NOJUMP)
+					|| existing_swapfile(buf))
+		    {
+			unload_dummy_buffer(buf, dirname_start);
+			// Keeping the buffer, remove the dummy flag.
+			buf->b_flags &= ~BF_DUMMY;
+			buf = NULL;
+		    }
+		}
+
+		if (buf != NULL)
+		{
+		    // Keeping the buffer, remove the dummy flag.
+		    buf->b_flags &= ~BF_DUMMY;
+
+		    // If the buffer is still loaded we need to use the
+		    // directory we jumped to below.
+		    if (buf == *first_match_buf
+			    && *target_dir == NULL
+			    && STRCMP(dirname_start, dirname_now) != 0)
+			*target_dir = vim_strsave(dirname_now);
+
+		    // The buffer is still loaded, the Filetype autocommands
+		    // need to be done now, in that buffer.  And the modelines
+		    // need to be done (again).  But not the window-local
+		    // options!
+		    aucmd_prepbuf(&aco, buf);
+		    if (curbuf == buf)
+		    {
+#if defined(FEAT_SYN_HL)
+			apply_autocmds(EVENT_FILETYPE, buf->b_p_ft,
+						     buf->b_fname, TRUE, buf);
+#endif
+			do_modelines(OPT_NOWIN);
+			aucmd_restbuf(&aco);
+		    }
+		}
+	    }
+	}
+    }
+
+    status = OK;
+
+theend:
+    vim_free(dirname_now);
+    vim_free(dirname_start);
+    return status;
+}
+
+/*
+ * ":vimgrep {pattern} file(s)"
+ * ":vimgrepadd {pattern} file(s)"
+ * ":lvimgrep {pattern} file(s)"
+ * ":lvimgrepadd {pattern} file(s)"
+ */
+    void
+ex_vimgrep(exarg_T *eap)
+{
+    vgr_args_T	args;
+    qf_info_T	*qi;
+    qf_list_T	*qfl;
+    int_u	save_qfid;
+    win_T	*wp = NULL;
+    int		redraw_for_dummy = FALSE;
+    buf_T	*first_match_buf = NULL;
+    char_u	*target_dir = NULL;
+    char_u	*au_name =  NULL;
+    int		status;
+
+    au_name = vgr_get_auname(eap->cmdidx);
+    if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
+					       curbuf->b_fname, TRUE, curbuf))
+    {
+#ifdef FEAT_EVAL
+	if (aborting())
+	    return;
+#endif
+    }
+
+    qi = qf_cmd_get_or_alloc_stack(eap, &wp);
+    if (qi == NULL)
+	return;
+
+    if (vgr_process_args(eap, &args) == FAIL)
+	goto theend;
+
+    if ((eap->cmdidx != CMD_grepadd && eap->cmdidx != CMD_lgrepadd
+		&& eap->cmdidx != CMD_vimgrepadd
+		&& eap->cmdidx != CMD_lvimgrepadd)
+					|| qf_stack_empty(qi))
+	// make place for a new list
+	qf_new_list(qi, args.qf_title);
+
+    incr_quickfix_busy();
+
+    status = vgr_process_files(wp, qi, &args, &redraw_for_dummy,
+						&first_match_buf, &target_dir);
+    if (status != OK)
+    {
+	FreeWild(args.fcount, args.fnames);
+	decr_quickfix_busy();
+	goto theend;
+    }
+
+    FreeWild(args.fcount, args.fnames);
+
+    qfl = qf_get_curlist(qi);
+    qfl->qf_nonevalid = FALSE;
+    qfl->qf_ptr = qfl->qf_start;
+    qfl->qf_index = 1;
+    qf_list_changed(qfl);
+
+    qf_update_buffer(qi, NULL);
+
+    // Remember the current quickfix list identifier, so that we can check for
+    // autocommands changing the current quickfix list.
+    save_qfid = qf_get_curlist(qi)->qf_id;
+
+    if (au_name != NULL)
+	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
+					       curbuf->b_fname, TRUE, curbuf);
+    // The QuickFixCmdPost autocmd may free the quickfix list. Check the list
+    // is still valid.
+    if (!qflist_valid(wp, save_qfid)
+	    || qf_restore_list(qi, save_qfid) == FAIL)
+    {
+	decr_quickfix_busy();
+	goto theend;
+    }
+
+    // Jump to first match.
+    if (!qf_list_empty(qf_get_curlist(qi)))
+    {
+	if ((args.flags & VGR_NOJUMP) == 0)
+	    vgr_jump_to_match(qi, eap->forceit, &redraw_for_dummy,
+		    first_match_buf, target_dir);
+    }
+    else
+	semsg(_(e_no_match_str_2), args.spat);
+
+    decr_quickfix_busy();
+
+    // If we loaded a dummy buffer into the current window, the autocommands
+    // may have messed up things, need to redraw and recompute folds.
+    if (redraw_for_dummy)
+    {
+#ifdef FEAT_FOLDING
+	foldUpdateAll(curwin);
+#else
+	redraw_later(UPD_NOT_VALID);
+#endif
+    }
+
+theend:
+    vim_free(args.qf_title);
+    vim_free(target_dir);
+    vim_regfree(args.regmatch.regprog);
+}
+
+/*
+ * Restore current working directory to "dirname_start" if they differ, taking
+ * into account whether it is set locally or globally.
+ */
+    static void
+restore_start_dir(char_u *dirname_start)
+{
+    char_u *dirname_now = alloc(MAXPATHL);
+
+    if (dirname_now == NULL)
+	return;
+
+    mch_dirname(dirname_now, MAXPATHL);
+    if (STRCMP(dirname_start, dirname_now) != 0)
+    {
+	// If the directory has changed, change it back by building up an
+	// appropriate ex command and executing it.
+	exarg_T ea;
+
+	CLEAR_FIELD(ea);
+	ea.arg = dirname_start;
+	ea.cmdidx = (curwin->w_localdir == NULL) ? CMD_cd : CMD_lcd;
+	ex_cd(&ea);
+    }
+    vim_free(dirname_now);
+}
+
+/*
+ * Load file "fname" into a dummy buffer and return the buffer pointer,
+ * placing the directory resulting from the buffer load into the
+ * "resulting_dir" pointer. "resulting_dir" must be allocated by the caller
+ * prior to calling this function. Restores directory to "dirname_start" prior
+ * to returning, if autocmds or the 'autochdir' option have changed it.
+ *
+ * If creating the dummy buffer does not fail, must call unload_dummy_buffer()
+ * or wipe_dummy_buffer() later!
+ *
+ * Returns NULL if it fails.
+ */
+    static buf_T *
+load_dummy_buffer(
+    char_u	*fname,
+    char_u	*dirname_start,  // in: old directory
+    char_u	*resulting_dir)  // out: new directory
+{
+    buf_T	*newbuf;
+    bufref_T	newbufref;
+    bufref_T	newbuf_to_wipe;
+    int		failed = TRUE;
+    aco_save_T	aco;
+    int		readfile_result;
+
+    // Allocate a buffer without putting it in the buffer list.
+    newbuf = buflist_new(NULL, NULL, (linenr_T)1, BLN_DUMMY);
+    if (newbuf == NULL)
+	return NULL;
+    set_bufref(&newbufref, newbuf);
+
+    // Init the options.
+    buf_copy_options(newbuf, BCO_ENTER | BCO_NOHELP);
+
+    // need to open the memfile before putting the buffer in a window
+    if (ml_open(newbuf) == OK)
+    {
+	// Make sure this buffer isn't wiped out by autocommands.
+	++newbuf->b_locked;
+
+	// set curwin/curbuf to buf and save a few things
+	aucmd_prepbuf(&aco, newbuf);
+	if (curbuf == newbuf)
+	{
+	    // Need to set the filename for autocommands.
+	    (void)setfname(curbuf, fname, NULL, FALSE);
+
+	    // Create swap file now to avoid the ATTENTION message.
+	    check_need_swap(TRUE);
+
+	    // Remove the "dummy" flag, otherwise autocommands may not
+	    // work.
+	    curbuf->b_flags &= ~BF_DUMMY;
+
+	    newbuf_to_wipe.br_buf = NULL;
+	    readfile_result = readfile(fname, NULL,
+			(linenr_T)0, (linenr_T)0, (linenr_T)MAXLNUM,
+			NULL, READ_NEW | READ_DUMMY);
+	    --newbuf->b_locked;
+	    if (readfile_result == OK
+		    && !got_int
+		    && !(curbuf->b_flags & BF_NEW))
+	    {
+		failed = FALSE;
+		if (curbuf != newbuf)
+		{
+		    // Bloody autocommands changed the buffer!  Can happen when
+		    // using netrw and editing a remote file.  Use the current
+		    // buffer instead, delete the dummy one after restoring the
+		    // window stuff.
+		    set_bufref(&newbuf_to_wipe, newbuf);
+		    newbuf = curbuf;
+		}
+	    }
+
+	    // restore curwin/curbuf and a few other things
+	    aucmd_restbuf(&aco);
+
+	    if (newbuf_to_wipe.br_buf != NULL && bufref_valid(&newbuf_to_wipe))
+		wipe_buffer(newbuf_to_wipe.br_buf, FALSE);
+	}
+
+	// Add back the "dummy" flag, otherwise buflist_findname_stat() won't
+	// skip it.
+	newbuf->b_flags |= BF_DUMMY;
+    }
+
+    // When autocommands/'autochdir' option changed directory: go back.
+    // Let the caller know what the resulting dir was first, in case it is
+    // important.
+    mch_dirname(resulting_dir, MAXPATHL);
+    restore_start_dir(dirname_start);
+
+    if (!bufref_valid(&newbufref))
+	return NULL;
+    if (failed)
+    {
+	wipe_dummy_buffer(newbuf, dirname_start);
+	return NULL;
+    }
+    return newbuf;
+}
+
+/*
+ * Wipe out the dummy buffer that load_dummy_buffer() created. Restores
+ * directory to "dirname_start" prior to returning, if autocmds or the
+ * 'autochdir' option have changed it.
+ */
+    static void
+wipe_dummy_buffer(buf_T *buf, char_u *dirname_start)
+{
+    // If any autocommand opened a window on the dummy buffer, close that
+    // window.  If we can't close them all then give up.
+    while (buf->b_nwindows > 0)
+    {
+	int	    did_one = FALSE;
+	win_T	    *wp;
+
+	if (firstwin->w_next != NULL)
+	    FOR_ALL_WINDOWS(wp)
+		if (wp->w_buffer == buf)
+		{
+		    if (win_close(wp, FALSE) == OK)
+			did_one = TRUE;
+		    break;
+		}
+	if (!did_one)
+	    return;
+    }
+
+    if (curbuf != buf && buf->b_nwindows == 0)	// safety check
+    {
+#if defined(FEAT_EVAL)
+	cleanup_T   cs;
+
+	// Reset the error/interrupt/exception state here so that aborting()
+	// returns FALSE when wiping out the buffer.  Otherwise it doesn't
+	// work when got_int is set.
+	enter_cleanup(&cs);
+#endif
+
+	wipe_buffer(buf, TRUE);
+
+#if defined(FEAT_EVAL)
+	// Restore the error/interrupt/exception state if not discarded by a
+	// new aborting error, interrupt, or uncaught exception.
+	leave_cleanup(&cs);
+#endif
+	// When autocommands/'autochdir' option changed directory: go back.
+	restore_start_dir(dirname_start);
+    }
+}
+
+/*
+ * Unload the dummy buffer that load_dummy_buffer() created. Restores
+ * directory to "dirname_start" prior to returning, if autocmds or the
+ * 'autochdir' option have changed it.
+ */
+    static void
+unload_dummy_buffer(buf_T *buf, char_u *dirname_start)
+{
+    if (curbuf == buf)		// safety check
+	return;
+
+    close_buffer(NULL, buf, DOBUF_UNLOAD, FALSE, TRUE);
+
+    // When autocommands/'autochdir' option changed directory: go back.
+    restore_start_dir(dirname_start);
+}
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * Copy the specified quickfix entry items into a new dict and append the dict
+ * to 'list'.  Returns OK on success.
+ */
+    static int
+get_qfline_items(qfline_T *qfp, list_T *list)
+{
+    int		bufnum;
+    dict_T	*dict;
+    char_u	buf[2];
+
+    // Handle entries with a non-existing buffer number.
+    bufnum = qfp->qf_fnum;
+    if (bufnum != 0 && (buflist_findnr(bufnum) == NULL))
+	bufnum = 0;
+
+    if ((dict = dict_alloc()) == NULL)
+	return FAIL;
+    if (list_append_dict(list, dict) == FAIL)
+	return FAIL;
+
+    buf[0] = qfp->qf_type;
+    buf[1] = NUL;
+    if (dict_add_number(dict, "bufnr", (long)bufnum) == FAIL
+	    || dict_add_number(dict, "lnum",     (long)qfp->qf_lnum) == FAIL
+	    || dict_add_number(dict, "end_lnum", (long)qfp->qf_end_lnum) == FAIL
+	    || dict_add_number(dict, "col",      (long)qfp->qf_col) == FAIL
+	    || dict_add_number(dict, "end_col",  (long)qfp->qf_end_col) == FAIL
+	    || dict_add_number(dict, "vcol",     (long)qfp->qf_viscol) == FAIL
+	    || dict_add_number(dict, "nr",       (long)qfp->qf_nr) == FAIL
+	    || dict_add_string(dict, "module", qfp->qf_module) == FAIL
+	    || dict_add_string(dict, "pattern", qfp->qf_pattern) == FAIL
+	    || dict_add_string(dict, "text", qfp->qf_text) == FAIL
+	    || dict_add_string(dict, "type", buf) == FAIL
+	    || dict_add_number(dict, "valid", (long)qfp->qf_valid) == FAIL)
+	return FAIL;
+
+    return OK;
+}
+
+/*
+ * Add each quickfix error to list "list" as a dictionary.
+ * If qf_idx is -1, use the current list. Otherwise, use the specified list.
+ * If eidx is not 0, then return only the specified entry. Otherwise return
+ * all the entries.
+ */
+    static int
+get_errorlist(
+	qf_info_T	*qi_arg,
+	win_T		*wp,
+	int		qf_idx,
+	int		eidx,
+	list_T		*list)
+{
+    qf_info_T	*qi = qi_arg;
+    qf_list_T	*qfl;
+    qfline_T	*qfp;
+    int		i;
+
+    if (qi == NULL)
+    {
+	qi = &ql_info;
+	if (wp != NULL)
+	{
+	    qi = GET_LOC_LIST(wp);
+	    if (qi == NULL)
+		return FAIL;
+	}
+    }
+
+    if (eidx < 0)
+	return OK;
+
+    if (qf_idx == INVALID_QFIDX)
+	qf_idx = qi->qf_curlist;
+
+    if (qf_idx >= qi->qf_listcount)
+	return FAIL;
+
+    qfl = qf_get_list(qi, qf_idx);
+    if (qf_list_empty(qfl))
+	return FAIL;
+
+    FOR_ALL_QFL_ITEMS(qfl, qfp, i)
+    {
+	if (eidx > 0)
+	{
+	    if (eidx == i)
+		return get_qfline_items(qfp, list);
+	}
+	else if (get_qfline_items(qfp, list) == FAIL)
+	    return FAIL;
+    }
+
+    return OK;
+}
+
+// Flags used by getqflist()/getloclist() to determine which fields to return.
+enum {
+    QF_GETLIST_NONE	= 0x0,
+    QF_GETLIST_TITLE	= 0x1,
+    QF_GETLIST_ITEMS	= 0x2,
+    QF_GETLIST_NR	= 0x4,
+    QF_GETLIST_WINID	= 0x8,
+    QF_GETLIST_CONTEXT	= 0x10,
+    QF_GETLIST_ID	= 0x20,
+    QF_GETLIST_IDX	= 0x40,
+    QF_GETLIST_SIZE	= 0x80,
+    QF_GETLIST_TICK	= 0x100,
+    QF_GETLIST_FILEWINID	= 0x200,
+    QF_GETLIST_QFBUFNR	= 0x400,
+    QF_GETLIST_QFTF	= 0x800,
+    QF_GETLIST_ALL	= 0xFFF,
+};
+
+/*
+ * Parse text from 'di' and return the quickfix list items.
+ * Existing quickfix lists are not modified.
+ */
+    static int
+qf_get_list_from_lines(dict_T *what, dictitem_T *di, dict_T *retdict)
+{
+    int		status = FAIL;
+    qf_info_T	*qi;
+    char_u	*errorformat = p_efm;
+    dictitem_T	*efm_di;
+    list_T	*l;
+
+    // Only a List value is supported
+    if (di->di_tv.v_type != VAR_LIST || di->di_tv.vval.v_list == NULL)
+	return FAIL;
+
+    // If errorformat is supplied then use it, otherwise use the 'efm'
+    // option setting
+    if ((efm_di = dict_find(what, (char_u *)"efm", -1)) != NULL)
+    {
+	if (efm_di->di_tv.v_type != VAR_STRING ||
+		efm_di->di_tv.vval.v_string == NULL)
+	    return FAIL;
+	errorformat = efm_di->di_tv.vval.v_string;
+    }
+
+    l = list_alloc();
+    if (l == NULL)
+	return FAIL;
+
+    qi = qf_alloc_stack(QFLT_INTERNAL);
+    if (qi != NULL)
+    {
+	if (qf_init_ext(qi, 0, NULL, NULL, &di->di_tv, errorformat,
+		    TRUE, (linenr_T)0, (linenr_T)0, NULL, NULL) > 0)
+	{
+	    (void)get_errorlist(qi, NULL, 0, 0, l);
+	    qf_free(&qi->qf_lists[0]);
+	}
+	free(qi);
+    }
+    dict_add_list(retdict, "items", l);
+    status = OK;
+
+    return status;
+}
+
+/*
+ * Return the quickfix/location list window identifier in the current tabpage.
+ */
+    static int
+qf_winid(qf_info_T *qi)
+{
+    win_T	*win;
+
+    // The quickfix window can be opened even if the quickfix list is not set
+    // using ":copen". This is not true for location lists.
+    if (qi == NULL)
+	return 0;
+    win = qf_find_win(qi);
+    if (win != NULL)
+	return win->w_id;
+    return 0;
+}
+
+/*
+ * Returns the number of the buffer displayed in the quickfix/location list
+ * window. If there is no buffer associated with the list or the buffer is
+ * wiped out, then returns 0.
+ */
+    static int
+qf_getprop_qfbufnr(qf_info_T *qi, dict_T *retdict)
+{
+    int	bufnum = 0;
+
+    if (qi != NULL && buflist_findnr(qi->qf_bufnr) != NULL)
+	bufnum = qi->qf_bufnr;
+
+    return dict_add_number(retdict, "qfbufnr", bufnum);
+}
+
+/*
+ * Convert the keys in 'what' to quickfix list property flags.
+ */
+    static int
+qf_getprop_keys2flags(dict_T *what, int loclist)
+{
+    int		flags = QF_GETLIST_NONE;
+
+    if (dict_has_key(what, "all"))
+    {
+	flags |= QF_GETLIST_ALL;
+	if (!loclist)
+	    // File window ID is applicable only to location list windows
+	    flags &= ~ QF_GETLIST_FILEWINID;
+    }
+
+    if (dict_has_key(what, "title"))
+	flags |= QF_GETLIST_TITLE;
+
+    if (dict_has_key(what, "nr"))
+	flags |= QF_GETLIST_NR;
+
+    if (dict_has_key(what, "winid"))
+	flags |= QF_GETLIST_WINID;
+
+    if (dict_has_key(what, "context"))
+	flags |= QF_GETLIST_CONTEXT;
+
+    if (dict_has_key(what, "id"))
+	flags |= QF_GETLIST_ID;
+
+    if (dict_has_key(what, "items"))
+	flags |= QF_GETLIST_ITEMS;
+
+    if (dict_has_key(what, "idx"))
+	flags |= QF_GETLIST_IDX;
+
+    if (dict_has_key(what, "size"))
+	flags |= QF_GETLIST_SIZE;
+
+    if (dict_has_key(what, "changedtick"))
+	flags |= QF_GETLIST_TICK;
+
+    if (loclist && dict_has_key(what, "filewinid"))
+	flags |= QF_GETLIST_FILEWINID;
+
+    if (dict_has_key(what, "qfbufnr"))
+	flags |= QF_GETLIST_QFBUFNR;
+
+    if (dict_has_key(what, "quickfixtextfunc"))
+	flags |= QF_GETLIST_QFTF;
+
+    return flags;
+}
+
+/*
+ * Return the quickfix list index based on 'nr' or 'id' in 'what'.
+ * If 'nr' and 'id' are not present in 'what' then return the current
+ * quickfix list index.
+ * If 'nr' is zero then return the current quickfix list index.
+ * If 'nr' is '$' then return the last quickfix list index.
+ * If 'id' is present then return the index of the quickfix list with that id.
+ * If 'id' is zero then return the quickfix list index specified by 'nr'.
+ * Return -1, if quickfix list is not present or if the stack is empty.
+ */
+    static int
+qf_getprop_qfidx(qf_info_T *qi, dict_T *what)
+{
+    int		qf_idx;
+    dictitem_T	*di;
+
+    qf_idx = qi->qf_curlist;	// default is the current list
+    if ((di = dict_find(what, (char_u *)"nr", -1)) != NULL)
+    {
+	// Use the specified quickfix/location list
+	if (di->di_tv.v_type == VAR_NUMBER)
+	{
+	    // for zero use the current list
+	    if (di->di_tv.vval.v_number != 0)
+	    {
+		qf_idx = di->di_tv.vval.v_number - 1;
+		if (qf_idx < 0 || qf_idx >= qi->qf_listcount)
+		    qf_idx = INVALID_QFIDX;
+	    }
+	}
+	else if (di->di_tv.v_type == VAR_STRING
+		&& di->di_tv.vval.v_string != NULL
+		&& STRCMP(di->di_tv.vval.v_string, "$") == 0)
+	    // Get the last quickfix list number
+	    qf_idx = qi->qf_listcount - 1;
+	else
+	    qf_idx = INVALID_QFIDX;
+    }
+
+    if ((di = dict_find(what, (char_u *)"id", -1)) != NULL)
+    {
+	// Look for a list with the specified id
+	if (di->di_tv.v_type == VAR_NUMBER)
+	{
+	    // For zero, use the current list or the list specified by 'nr'
+	    if (di->di_tv.vval.v_number != 0)
+		qf_idx = qf_id2nr(qi, di->di_tv.vval.v_number);
+	}
+	else
+	    qf_idx = INVALID_QFIDX;
+    }
+
+    return qf_idx;
+}
+
+/*
+ * Return default values for quickfix list properties in retdict.
+ */
+    static int
+qf_getprop_defaults(qf_info_T *qi, int flags, int locstack, dict_T *retdict)
+{
+    int		status = OK;
+
+    if (flags & QF_GETLIST_TITLE)
+	status = dict_add_string(retdict, "title", (char_u *)"");
+    if ((status == OK) && (flags & QF_GETLIST_ITEMS))
+    {
+	list_T	*l = list_alloc();
+	if (l != NULL)
+	    status = dict_add_list(retdict, "items", l);
+	else
+	    status = FAIL;
+    }
+    if ((status == OK) && (flags & QF_GETLIST_NR))
+	status = dict_add_number(retdict, "nr", 0);
+    if ((status == OK) && (flags & QF_GETLIST_WINID))
+	status = dict_add_number(retdict, "winid", qf_winid(qi));
+    if ((status == OK) && (flags & QF_GETLIST_CONTEXT))
+	status = dict_add_string(retdict, "context", (char_u *)"");
+    if ((status == OK) && (flags & QF_GETLIST_ID))
+	status = dict_add_number(retdict, "id", 0);
+    if ((status == OK) && (flags & QF_GETLIST_IDX))
+	status = dict_add_number(retdict, "idx", 0);
+    if ((status == OK) && (flags & QF_GETLIST_SIZE))
+	status = dict_add_number(retdict, "size", 0);
+    if ((status == OK) && (flags & QF_GETLIST_TICK))
+	status = dict_add_number(retdict, "changedtick", 0);
+    if ((status == OK) && locstack && (flags & QF_GETLIST_FILEWINID))
+	status = dict_add_number(retdict, "filewinid", 0);
+    if ((status == OK) && (flags & QF_GETLIST_QFBUFNR))
+	status = qf_getprop_qfbufnr(qi, retdict);
+    if ((status == OK) && (flags & QF_GETLIST_QFTF))
+	status = dict_add_string(retdict, "quickfixtextfunc", (char_u *)"");
+
+    return status;
+}
+
+/*
+ * Return the quickfix list title as 'title' in retdict
+ */
+    static int
+qf_getprop_title(qf_list_T *qfl, dict_T *retdict)
+{
+    return dict_add_string(retdict, "title", qfl->qf_title);
+}
+
+/*
+ * Returns the identifier of the window used to display files from a location
+ * list.  If there is no associated window, then returns 0. Useful only when
+ * called from a location list window.
+ */
+    static int
+qf_getprop_filewinid(win_T *wp, qf_info_T *qi, dict_T *retdict)
+{
+    int winid = 0;
+
+    if (wp != NULL && IS_LL_WINDOW(wp))
+    {
+	win_T	*ll_wp = qf_find_win_with_loclist(qi);
+	if (ll_wp != NULL)
+	    winid = ll_wp->w_id;
+    }
+
+    return dict_add_number(retdict, "filewinid", winid);
+}
+
+/*
+ * Return the quickfix list items/entries as 'items' in retdict.
+ * If eidx is not 0, then return the item at the specified index.
+ */
+    static int
+qf_getprop_items(qf_info_T *qi, int qf_idx, int eidx, dict_T *retdict)
+{
+    int		status = OK;
+    list_T	*l = list_alloc();
+    if (l != NULL)
+    {
+	(void)get_errorlist(qi, NULL, qf_idx, eidx, l);
+	dict_add_list(retdict, "items", l);
+    }
+    else
+	status = FAIL;
+
+    return status;
+}
+
+/*
+ * Return the quickfix list context (if any) as 'context' in retdict.
+ */
+    static int
+qf_getprop_ctx(qf_list_T *qfl, dict_T *retdict)
+{
+    int		status;
+    dictitem_T	*di;
+
+    if (qfl->qf_ctx != NULL)
+    {
+	di = dictitem_alloc((char_u *)"context");
+	if (di != NULL)
+	{
+	    copy_tv(qfl->qf_ctx, &di->di_tv);
+	    status = dict_add(retdict, di);
+	    if (status == FAIL)
+		dictitem_free(di);
+	}
+	else
+	    status = FAIL;
+    }
+    else
+	status = dict_add_string(retdict, "context", (char_u *)"");
+
+    return status;
+}
+
+/*
+ * Return the current quickfix list index as 'idx' in retdict.
+ * If a specific entry index (eidx) is supplied, then use that.
+ */
+    static int
+qf_getprop_idx(qf_list_T *qfl, int eidx, dict_T *retdict)
+{
+    if (eidx == 0)
+    {
+	eidx = qfl->qf_index;
+	if (qf_list_empty(qfl))
+	    // For empty lists, current index is set to 0
+	    eidx = 0;
+    }
+    return dict_add_number(retdict, "idx", eidx);
+}
+
+/*
+ * Return the 'quickfixtextfunc' function of a quickfix/location list
+ */
+    static int
+qf_getprop_qftf(qf_list_T *qfl, dict_T *retdict)
+{
+    int		status;
+
+    if (qfl->qf_qftf_cb.cb_name != NULL)
+    {
+	typval_T	tv;
+
+	put_callback(&qfl->qf_qftf_cb, &tv);
+	status = dict_add_tv(retdict, "quickfixtextfunc", &tv);
+	clear_tv(&tv);
+    }
+    else
+	status = dict_add_string(retdict, "quickfixtextfunc", (char_u *)"");
+
+    return status;
+}
+
+/*
+ * Return quickfix/location list details (title) as a
+ * dictionary. 'what' contains the details to return. If 'list_idx' is -1,
+ * then current list is used. Otherwise the specified list is used.
+ */
+    static int
+qf_get_properties(win_T *wp, dict_T *what, dict_T *retdict)
+{
+    qf_info_T	*qi = &ql_info;
+    qf_list_T	*qfl;
+    int		status = OK;
+    int		qf_idx = INVALID_QFIDX;
+    int		eidx = 0;
+    dictitem_T	*di;
+    int		flags = QF_GETLIST_NONE;
+
+    if ((di = dict_find(what, (char_u *)"lines", -1)) != NULL)
+	return qf_get_list_from_lines(what, di, retdict);
+
+    if (wp != NULL)
+	qi = GET_LOC_LIST(wp);
+
+    flags = qf_getprop_keys2flags(what, (wp != NULL));
+
+    if (!qf_stack_empty(qi))
+	qf_idx = qf_getprop_qfidx(qi, what);
+
+    // List is not present or is empty
+    if (qf_stack_empty(qi) || qf_idx == INVALID_QFIDX)
+	return qf_getprop_defaults(qi, flags, wp != NULL, retdict);
+
+    qfl = qf_get_list(qi, qf_idx);
+
+    // If an entry index is specified, use that
+    if ((di = dict_find(what, (char_u *)"idx", -1)) != NULL)
+    {
+	if (di->di_tv.v_type != VAR_NUMBER)
+	    return FAIL;
+	eidx = di->di_tv.vval.v_number;
+    }
+
+    if (flags & QF_GETLIST_TITLE)
+	status = qf_getprop_title(qfl, retdict);
+    if ((status == OK) && (flags & QF_GETLIST_NR))
+	status = dict_add_number(retdict, "nr", qf_idx + 1);
+    if ((status == OK) && (flags & QF_GETLIST_WINID))
+	status = dict_add_number(retdict, "winid", qf_winid(qi));
+    if ((status == OK) && (flags & QF_GETLIST_ITEMS))
+	status = qf_getprop_items(qi, qf_idx, eidx, retdict);
+    if ((status == OK) && (flags & QF_GETLIST_CONTEXT))
+	status = qf_getprop_ctx(qfl, retdict);
+    if ((status == OK) && (flags & QF_GETLIST_ID))
+	status = dict_add_number(retdict, "id", qfl->qf_id);
+    if ((status == OK) && (flags & QF_GETLIST_IDX))
+	status = qf_getprop_idx(qfl, eidx, retdict);
+    if ((status == OK) && (flags & QF_GETLIST_SIZE))
+	status = dict_add_number(retdict, "size", qfl->qf_count);
+    if ((status == OK) && (flags & QF_GETLIST_TICK))
+	status = dict_add_number(retdict, "changedtick", qfl->qf_changedtick);
+    if ((status == OK) && (wp != NULL) && (flags & QF_GETLIST_FILEWINID))
+	status = qf_getprop_filewinid(wp, qi, retdict);
+    if ((status == OK) && (flags & QF_GETLIST_QFBUFNR))
+	status = qf_getprop_qfbufnr(qi, retdict);
+    if ((status == OK) && (flags & QF_GETLIST_QFTF))
+	status = qf_getprop_qftf(qfl, retdict);
+
+    return status;
+}
+
+/*
+ * Add a new quickfix entry to list at 'qf_idx' in the stack 'qi' from the
+ * items in the dict 'd'. If it is a valid error entry, then set 'valid_entry'
+ * to TRUE.
+ */
+    static int
+qf_add_entry_from_dict(
+	qf_list_T	*qfl,
+	dict_T		*d,
+	int		first_entry,
+	int		*valid_entry)
+{
+    static int	did_bufnr_emsg;
+    char_u	*filename, *module, *pattern, *text, *type;
+    int		bufnum, valid, status, col, end_col, vcol, nr;
+    long	lnum, end_lnum;
+
+    if (first_entry)
+	did_bufnr_emsg = FALSE;
+
+    filename = dict_get_string(d, "filename", TRUE);
+    module = dict_get_string(d, "module", TRUE);
+    bufnum = (int)dict_get_number(d, "bufnr");
+    lnum = (int)dict_get_number(d, "lnum");
+    end_lnum = (int)dict_get_number(d, "end_lnum");
+    col = (int)dict_get_number(d, "col");
+    end_col = (int)dict_get_number(d, "end_col");
+    vcol = (int)dict_get_number(d, "vcol");
+    nr = (int)dict_get_number(d, "nr");
+    type = dict_get_string(d, "type", TRUE);
+    pattern = dict_get_string(d, "pattern", TRUE);
+    text = dict_get_string(d, "text", TRUE);
+    if (text == NULL)
+	text = vim_strsave((char_u *)"");
+
+    valid = TRUE;
+    if ((filename == NULL && bufnum == 0) || (lnum == 0 && pattern == NULL))
+	valid = FALSE;
+
+    // Mark entries with non-existing buffer number as not valid. Give the
+    // error message only once.
+    if (bufnum != 0 && (buflist_findnr(bufnum) == NULL))
+    {
+	if (!did_bufnr_emsg)
+	{
+	    did_bufnr_emsg = TRUE;
+	    semsg(_(e_buffer_nr_not_found), bufnum);
+	}
+	valid = FALSE;
+	bufnum = 0;
+    }
+
+    // If the 'valid' field is present it overrules the detected value.
+    if (dict_has_key(d, "valid"))
+	valid = (int)dict_get_bool(d, "valid", FALSE);
+
+    status =  qf_add_entry(qfl,
+			NULL,		// dir
+			filename,
+			module,
+			bufnum,
+			text,
+			lnum,
+			end_lnum,
+			col,
+			end_col,
+			vcol,		// vis_col
+			pattern,	// search pattern
+			nr,
+			type == NULL ? NUL : *type,
+			valid);
+
+    vim_free(filename);
+    vim_free(module);
+    vim_free(pattern);
+    vim_free(text);
+    vim_free(type);
+
+    if (valid)
+	*valid_entry = TRUE;
+
+    return status;
+}
+
+/*
+ * Add list of entries to quickfix/location list. Each list entry is
+ * a dictionary with item information.
+ */
+    static int
+qf_add_entries(
+	qf_info_T	*qi,
+	int		qf_idx,
+	list_T		*list,
+	char_u		*title,
+	int		action)
+{
+    qf_list_T	*qfl = qf_get_list(qi, qf_idx);
+    listitem_T	*li;
+    dict_T	*d;
+    qfline_T	*old_last = NULL;
+    int		retval = OK;
+    int		valid_entry = FALSE;
+
+    if (action == ' ' || qf_idx == qi->qf_listcount)
+    {
+	// make place for a new list
+	qf_new_list(qi, title);
+	qf_idx = qi->qf_curlist;
+	qfl = qf_get_list(qi, qf_idx);
+    }
+    else if (action == 'a' && !qf_list_empty(qfl))
+	// Adding to existing list, use last entry.
+	old_last = qfl->qf_last;
+    else if (action == 'r')
+    {
+	qf_free_items(qfl);
+	qf_store_title(qfl, title);
+    }
+
+    FOR_ALL_LIST_ITEMS(list, li)
+    {
+	if (li->li_tv.v_type != VAR_DICT)
+	    continue; // Skip non-dict items
+
+	d = li->li_tv.vval.v_dict;
+	if (d == NULL)
+	    continue;
+
+	retval = qf_add_entry_from_dict(qfl, d, li == list->lv_first,
+								&valid_entry);
+	if (retval == QF_FAIL)
+	    break;
+    }
+
+    // Check if any valid error entries are added to the list.
+    if (valid_entry)
+	qfl->qf_nonevalid = FALSE;
+    else if (qfl->qf_index == 0)
+	// no valid entry
+	qfl->qf_nonevalid = TRUE;
+
+    // If not appending to the list, set the current error to the first entry
+    if (action != 'a')
+	qfl->qf_ptr = qfl->qf_start;
+
+    // Update the current error index if not appending to the list or if the
+    // list was empty before and it is not empty now.
+    if ((action != 'a' || qfl->qf_index == 0) && !qf_list_empty(qfl))
+	qfl->qf_index = 1;
+
+    // Don't update the cursor in quickfix window when appending entries
+    qf_update_buffer(qi, old_last);
+
+    return retval;
+}
+
+/*
+ * Get the quickfix list index from 'nr' or 'id'
+ */
+    static int
+qf_setprop_get_qfidx(
+	qf_info_T	*qi,
+	dict_T		*what,
+	int		action,
+	int		*newlist)
+{
+    dictitem_T	*di;
+    int		qf_idx = qi->qf_curlist;    // default is the current list
+
+    if ((di = dict_find(what, (char_u *)"nr", -1)) != NULL)
+    {
+	// Use the specified quickfix/location list
+	if (di->di_tv.v_type == VAR_NUMBER)
+	{
+	    // for zero use the current list
+	    if (di->di_tv.vval.v_number != 0)
+		qf_idx = di->di_tv.vval.v_number - 1;
+
+	    if ((action == ' ' || action == 'a') && qf_idx == qi->qf_listcount)
+	    {
+		// When creating a new list, accept qf_idx pointing to the next
+		// non-available list and add the new list at the end of the
+		// stack.
+		*newlist = TRUE;
+		qf_idx = qf_stack_empty(qi) ? 0 : qi->qf_listcount - 1;
+	    }
+	    else if (qf_idx < 0 || qf_idx >= qi->qf_listcount)
+		return INVALID_QFIDX;
+	    else if (action != ' ')
+		*newlist = FALSE;	// use the specified list
+	}
+	else if (di->di_tv.v_type == VAR_STRING
+		&& di->di_tv.vval.v_string != NULL
+		&& STRCMP(di->di_tv.vval.v_string, "$") == 0)
+	{
+	    if (!qf_stack_empty(qi))
+		qf_idx = qi->qf_listcount - 1;
+	    else if (*newlist)
+		qf_idx = 0;
+	    else
+		return INVALID_QFIDX;
+	}
+	else
+	    return INVALID_QFIDX;
+    }
+
+    if (!*newlist && (di = dict_find(what, (char_u *)"id", -1)) != NULL)
+    {
+	// Use the quickfix/location list with the specified id
+	if (di->di_tv.v_type != VAR_NUMBER)
+	    return INVALID_QFIDX;
+
+	return qf_id2nr(qi, di->di_tv.vval.v_number);
+    }
+
+    return qf_idx;
+}
+
+/*
+ * Set the quickfix list title.
+ */
+    static int
+qf_setprop_title(qf_info_T *qi, int qf_idx, dict_T *what, dictitem_T *di)
+{
+    qf_list_T	*qfl = qf_get_list(qi, qf_idx);
+
+    if (di->di_tv.v_type != VAR_STRING)
+	return FAIL;
+
+    vim_free(qfl->qf_title);
+    qfl->qf_title = dict_get_string(what, "title", TRUE);
+    if (qf_idx == qi->qf_curlist)
+	qf_update_win_titlevar(qi);
+
+    return OK;
+}
+
+/*
+ * Set quickfix list items/entries.
+ */
+    static int
+qf_setprop_items(qf_info_T *qi, int qf_idx, dictitem_T *di, int action)
+{
+    int		retval = FAIL;
+    char_u	*title_save;
+
+    if (di->di_tv.v_type != VAR_LIST)
+	return FAIL;
+
+    title_save = vim_strsave(qi->qf_lists[qf_idx].qf_title);
+    retval = qf_add_entries(qi, qf_idx, di->di_tv.vval.v_list,
+	    title_save, action == ' ' ? 'a' : action);
+    vim_free(title_save);
+
+    return retval;
+}
+
+/*
+ * Set quickfix list items/entries from a list of lines.
+ */
+    static int
+qf_setprop_items_from_lines(
+	qf_info_T	*qi,
+	int		qf_idx,
+	dict_T		*what,
+	dictitem_T	*di,
+	int		action)
+{
+    char_u	*errorformat = p_efm;
+    dictitem_T	*efm_di;
+    int		retval = FAIL;
+
+    // Use the user supplied errorformat settings (if present)
+    if ((efm_di = dict_find(what, (char_u *)"efm", -1)) != NULL)
+    {
+	if (efm_di->di_tv.v_type != VAR_STRING ||
+		efm_di->di_tv.vval.v_string == NULL)
+	    return FAIL;
+	errorformat = efm_di->di_tv.vval.v_string;
+    }
+
+    // Only a List value is supported
+    if (di->di_tv.v_type != VAR_LIST || di->di_tv.vval.v_list == NULL)
+	return FAIL;
+
+    if (action == 'r')
+	qf_free_items(&qi->qf_lists[qf_idx]);
+    if (qf_init_ext(qi, qf_idx, NULL, NULL, &di->di_tv, errorformat,
+		FALSE, (linenr_T)0, (linenr_T)0, NULL, NULL) >= 0)
+	retval = OK;
+
+    return retval;
+}
+
+/*
+ * Set quickfix list context.
+ */
+    static int
+qf_setprop_context(qf_list_T *qfl, dictitem_T *di)
+{
+    typval_T	*ctx;
+
+    free_tv(qfl->qf_ctx);
+    ctx =  alloc_tv();
+    if (ctx != NULL)
+	copy_tv(&di->di_tv, ctx);
+    qfl->qf_ctx = ctx;
+
+    return OK;
+}
+
+/*
+ * Set the current index in the specified quickfix list
+ */
+    static int
+qf_setprop_curidx(qf_info_T *qi, qf_list_T *qfl, dictitem_T *di)
+{
+    int		denote = FALSE;
+    int		newidx;
+    int		old_qfidx;
+    qfline_T	*qf_ptr;
+
+    // If the specified index is '$', then use the last entry
+    if (di->di_tv.v_type == VAR_STRING
+	    && di->di_tv.vval.v_string != NULL
+	    && STRCMP(di->di_tv.vval.v_string, "$") == 0)
+	newidx = qfl->qf_count;
+    else
+    {
+	// Otherwise use the specified index
+	newidx = tv_get_number_chk(&di->di_tv, &denote);
+	if (denote)
+	    return FAIL;
+    }
+
+    if (newidx < 1)		// sanity check
+	return FAIL;
+    if (newidx > qfl->qf_count)
+	newidx = qfl->qf_count;
+
+    old_qfidx = qfl->qf_index;
+    qf_ptr = get_nth_entry(qfl, newidx, &newidx);
+    if (qf_ptr == NULL)
+	return FAIL;
+    qfl->qf_ptr = qf_ptr;
+    qfl->qf_index = newidx;
+
+    // If the current list is modified and it is displayed in the quickfix
+    // window, then Update it.
+    if (qf_get_curlist(qi)->qf_id == qfl->qf_id)
+	qf_win_pos_update(qi, old_qfidx);
+
+    return OK;
+}
+
+/*
+ * Set the current index in the specified quickfix list
+ */
+    static int
+qf_setprop_qftf(qf_info_T *qi UNUSED, qf_list_T *qfl, dictitem_T *di)
+{
+    callback_T	cb;
+
+    free_callback(&qfl->qf_qftf_cb);
+    cb = get_callback(&di->di_tv);
+    if (cb.cb_name == NULL || *cb.cb_name == NUL)
+	return OK;
+
+    set_callback(&qfl->qf_qftf_cb, &cb);
+    if (cb.cb_free_name)
+	vim_free(cb.cb_name);
+
+    return OK;
+}
+
+/*
+ * Set quickfix/location list properties (title, items, context).
+ * Also used to add items from parsing a list of lines.
+ * Used by the setqflist() and setloclist() Vim script functions.
+ */
+    static int
+qf_set_properties(qf_info_T *qi, dict_T *what, int action, char_u *title)
+{
+    dictitem_T	*di;
+    int		retval = FAIL;
+    int		qf_idx;
+    int		newlist = FALSE;
+    qf_list_T	*qfl;
+
+    if (action == ' ' || qf_stack_empty(qi))
+	newlist = TRUE;
+
+    qf_idx = qf_setprop_get_qfidx(qi, what, action, &newlist);
+    if (qf_idx == INVALID_QFIDX)	// List not found
+	return FAIL;
+
+    if (newlist)
+    {
+	qi->qf_curlist = qf_idx;
+	qf_new_list(qi, title);
+	qf_idx = qi->qf_curlist;
+    }
+
+    qfl = qf_get_list(qi, qf_idx);
+    if ((di = dict_find(what, (char_u *)"title", -1)) != NULL)
+	retval = qf_setprop_title(qi, qf_idx, what, di);
+    if ((di = dict_find(what, (char_u *)"items", -1)) != NULL)
+	retval = qf_setprop_items(qi, qf_idx, di, action);
+    if ((di = dict_find(what, (char_u *)"lines", -1)) != NULL)
+	retval = qf_setprop_items_from_lines(qi, qf_idx, what, di, action);
+    if ((di = dict_find(what, (char_u *)"context", -1)) != NULL)
+	retval = qf_setprop_context(qfl, di);
+    if ((di = dict_find(what, (char_u *)"idx", -1)) != NULL)
+	retval = qf_setprop_curidx(qi, qfl, di);
+    if ((di = dict_find(what, (char_u *)"quickfixtextfunc", -1)) != NULL)
+	retval = qf_setprop_qftf(qi, qfl, di);
+
+    if (newlist || retval == OK)
+	qf_list_changed(qfl);
+    if (newlist)
+	qf_update_buffer(qi, NULL);
+
+    return retval;
+}
+
+/*
+ * Free the entire quickfix/location list stack.
+ * If the quickfix/location list window is open, then clear it.
+ */
+    static void
+qf_free_stack(win_T *wp, qf_info_T *qi)
+{
+    win_T	*qfwin = qf_find_win(qi);
+    win_T	*llwin = NULL;
+
+    if (qfwin != NULL)
+    {
+	// If the quickfix/location list window is open, then clear it
+	if (qi->qf_curlist < qi->qf_listcount)
+	    qf_free(qf_get_curlist(qi));
+	qf_update_buffer(qi, NULL);
+    }
+
+    if (wp != NULL && IS_LL_WINDOW(wp))
+    {
+	// If in the location list window, then use the non-location list
+	// window with this location list (if present)
+	llwin = qf_find_win_with_loclist(qi);
+	if (llwin != NULL)
+	    wp = llwin;
+    }
+
+    qf_free_all(wp);
+    if (wp == NULL)
+    {
+	// quickfix list
+	qi->qf_curlist = 0;
+	qi->qf_listcount = 0;
+    }
+    else if (qfwin != NULL)
+    {
+	// If the location list window is open, then create a new empty
+	// location list
+	qf_info_T *new_ll = qf_alloc_stack(QFLT_LOCATION);
+
+	if (new_ll != NULL)
+	{
+	    new_ll->qf_bufnr = qfwin->w_buffer->b_fnum;
+
+	    // first free the list reference in the location list window
+	    ll_free_all(&qfwin->w_llist_ref);
+
+	    qfwin->w_llist_ref = new_ll;
+	    if (wp != qfwin)
+		win_set_loclist(wp, new_ll);
+	}
+    }
+}
+
+/*
+ * Populate the quickfix list with the items supplied in the list
+ * of dictionaries. "title" will be copied to w:quickfix_title.
+ * "action" is 'a' for add, 'r' for replace.  Otherwise create a new list.
+ * When "what" is not NULL then only set some properties.
+ */
+    int
+set_errorlist(
+	win_T	*wp,
+	list_T	*list,
+	int	action,
+	char_u	*title,
+	dict_T	*what)
+{
+    qf_info_T	*qi = &ql_info;
+    int		retval = OK;
+
+    if (wp != NULL)
+    {
+	qi = ll_get_or_alloc_list(wp);
+	if (qi == NULL)
+	    return FAIL;
+    }
+
+    if (action == 'f')
+    {
+	// Free the entire quickfix or location list stack
+	qf_free_stack(wp, qi);
+	return OK;
+    }
+
+    // A dict argument cannot be specified with a non-empty list argument
+    if (list->lv_len != 0 && what != NULL)
+    {
+	semsg(_(e_invalid_argument_str),
+			 _("cannot have both a list and a \"what\" argument"));
+	return FAIL;
+    }
+
+    incr_quickfix_busy();
+
+    if (what != NULL)
+	retval = qf_set_properties(qi, what, action, title);
+    else
+    {
+	retval = qf_add_entries(qi, qi->qf_curlist, list, title, action);
+	if (retval == OK)
+	    qf_list_changed(qf_get_curlist(qi));
+    }
+
+    decr_quickfix_busy();
+
+    return retval;
+}
+
+/*
+ * Mark the quickfix context and callback function as in use for all the lists
+ * in a quickfix stack.
+ */
+    static int
+mark_quickfix_ctx(qf_info_T *qi, int copyID)
+{
+    int		i;
+    int		abort = FALSE;
+    typval_T	*ctx;
+    callback_T	*cb;
+
+    for (i = 0; i < LISTCOUNT && !abort; ++i)
+    {
+	ctx = qi->qf_lists[i].qf_ctx;
+	if (ctx != NULL && ctx->v_type != VAR_NUMBER
+		&& ctx->v_type != VAR_STRING && ctx->v_type != VAR_FLOAT)
+	    abort = abort || set_ref_in_item(ctx, copyID, NULL, NULL);
+
+	cb = &qi->qf_lists[i].qf_qftf_cb;
+	abort = abort || set_ref_in_callback(cb, copyID);
+    }
+
+    return abort;
+}
+
+/*
+ * Mark the context of the quickfix list and the location lists (if present) as
+ * "in use". So that garbage collection doesn't free the context.
+ */
+    int
+set_ref_in_quickfix(int copyID)
+{
+    int		abort = FALSE;
+    tabpage_T	*tp;
+    win_T	*win;
+
+    abort = mark_quickfix_ctx(&ql_info, copyID);
+    if (abort)
+	return abort;
+
+    abort = set_ref_in_callback(&qftf_cb, copyID);
+    if (abort)
+	return abort;
+
+    FOR_ALL_TAB_WINDOWS(tp, win)
+    {
+	if (win->w_llist != NULL)
+	{
+	    abort = mark_quickfix_ctx(win->w_llist, copyID);
+	    if (abort)
+		return abort;
+	}
+	if (IS_LL_WINDOW(win) && (win->w_llist_ref->qf_refcount == 1))
+	{
+	    // In a location list window and none of the other windows is
+	    // referring to this location list. Mark the location list
+	    // context as still in use.
+	    abort = mark_quickfix_ctx(win->w_llist_ref, copyID);
+	    if (abort)
+		return abort;
+	}
+    }
+
+    return abort;
+}
+#endif
+
+/*
+ * Return the autocmd name for the :cbuffer Ex commands
+ */
+    static char_u *
+cbuffer_get_auname(cmdidx_T cmdidx)
+{
+    switch (cmdidx)
+    {
+	case CMD_cbuffer:	return (char_u *)"cbuffer";
+	case CMD_cgetbuffer:	return (char_u *)"cgetbuffer";
+	case CMD_caddbuffer:	return (char_u *)"caddbuffer";
+	case CMD_lbuffer:	return (char_u *)"lbuffer";
+	case CMD_lgetbuffer:	return (char_u *)"lgetbuffer";
+	case CMD_laddbuffer:	return (char_u *)"laddbuffer";
+	default:		return NULL;
+    }
+}
+
+/*
+ * Process and validate the arguments passed to the :cbuffer, :caddbuffer,
+ * :cgetbuffer, :lbuffer, :laddbuffer, :lgetbuffer Ex commands.
+ */
+    static int
+cbuffer_process_args(
+	exarg_T		*eap,
+	buf_T		**bufp,
+	linenr_T	*line1,
+	linenr_T	*line2)
+{
+    buf_T	*buf = NULL;
+
+    if (*eap->arg == NUL)
+	buf = curbuf;
+    else if (*skipwhite(skipdigits(eap->arg)) == NUL)
+	buf = buflist_findnr(atoi((char *)eap->arg));
+
+    if (buf == NULL)
+    {
+	emsg(_(e_invalid_argument));
+	return FAIL;
+    }
+
+    if (buf->b_ml.ml_mfp == NULL)
+    {
+	emsg(_(e_buffer_is_not_loaded));
+	return FAIL;
+    }
+
+    if (eap->addr_count == 0)
+    {
+	eap->line1 = 1;
+	eap->line2 = buf->b_ml.ml_line_count;
+    }
+
+    if (eap->line1 < 1 || eap->line1 > buf->b_ml.ml_line_count
+	    || eap->line2 < 1 || eap->line2 > buf->b_ml.ml_line_count)
+    {
+	emsg(_(e_invalid_range));
+	return FAIL;
+    }
+
+    *line1 = eap->line1;
+    *line2 = eap->line2;
+    *bufp = buf;
+
+    return OK;
+}
+
+/*
+ * ":[range]cbuffer [bufnr]" command.
+ * ":[range]caddbuffer [bufnr]" command.
+ * ":[range]cgetbuffer [bufnr]" command.
+ * ":[range]lbuffer [bufnr]" command.
+ * ":[range]laddbuffer [bufnr]" command.
+ * ":[range]lgetbuffer [bufnr]" command.
+ */
+    void
+ex_cbuffer(exarg_T *eap)
+{
+    buf_T	*buf = NULL;
+    qf_info_T	*qi;
+    char_u	*au_name = NULL;
+    int		res;
+    int_u	save_qfid;
+    win_T	*wp = NULL;
+    char_u	*qf_title;
+    linenr_T	line1;
+    linenr_T	line2;
+
+    au_name = cbuffer_get_auname(eap->cmdidx);
+    if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
+					curbuf->b_fname, TRUE, curbuf))
+    {
+#ifdef FEAT_EVAL
+	if (aborting())
+	    return;
+#endif
+    }
+
+    // Must come after autocommands.
+    qi = qf_cmd_get_or_alloc_stack(eap, &wp);
+    if (qi == NULL)
+	return;
+
+    if (cbuffer_process_args(eap, &buf, &line1, &line2) == FAIL)
+	return;
+
+    qf_title = qf_cmdtitle(*eap->cmdlinep);
+
+    if (buf->b_sfname)
+    {
+	vim_snprintf((char *)IObuff, IOSIZE, "%s (%s)",
+		(char *)qf_title, (char *)buf->b_sfname);
+	qf_title = IObuff;
+    }
+
+    incr_quickfix_busy();
+
+    res = qf_init_ext(qi, qi->qf_curlist, NULL, buf, NULL, p_efm,
+	    (eap->cmdidx != CMD_caddbuffer
+	     && eap->cmdidx != CMD_laddbuffer),
+	    line1, line2,
+	    qf_title, NULL);
+    if (qf_stack_empty(qi))
+    {
+	decr_quickfix_busy();
+	return;
+    }
+    if (res >= 0)
+	qf_list_changed(qf_get_curlist(qi));
+
+    // Remember the current quickfix list identifier, so that we can
+    // check for autocommands changing the current quickfix list.
+    save_qfid = qf_get_curlist(qi)->qf_id;
+    if (au_name != NULL)
+    {
+	buf_T *curbuf_old = curbuf;
+
+	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name, curbuf->b_fname,
+								TRUE, curbuf);
+	if (curbuf != curbuf_old)
+	    // Autocommands changed buffer, don't jump now, "qi" may
+	    // be invalid.
+	    res = 0;
+    }
+    // Jump to the first error for a new list and if autocmds didn't
+    // free the list.
+    if (res > 0 && (eap->cmdidx == CMD_cbuffer ||
+		eap->cmdidx == CMD_lbuffer)
+	    && qflist_valid(wp, save_qfid))
+	// display the first error
+	qf_jump_first(qi, save_qfid, eap->forceit);
+
+    decr_quickfix_busy();
+}
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * Return the autocmd name for the :cexpr Ex commands.
+ */
+    char_u *
+cexpr_get_auname(cmdidx_T cmdidx)
+{
+    switch (cmdidx)
+    {
+	case CMD_cexpr:	    return (char_u *)"cexpr";
+	case CMD_cgetexpr:  return (char_u *)"cgetexpr";
+	case CMD_caddexpr:  return (char_u *)"caddexpr";
+	case CMD_lexpr:	    return (char_u *)"lexpr";
+	case CMD_lgetexpr:  return (char_u *)"lgetexpr";
+	case CMD_laddexpr:  return (char_u *)"laddexpr";
+	default:	    return NULL;
+    }
+}
+
+    int
+trigger_cexpr_autocmd(int cmdidx)
+{
+    char_u	*au_name = cexpr_get_auname(cmdidx);
+
+    if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
+					       curbuf->b_fname, TRUE, curbuf))
+    {
+	if (aborting())
+	    return FAIL;
+    }
+    return OK;
+}
+
+    int
+cexpr_core(exarg_T *eap, typval_T *tv)
+{
+    qf_info_T	*qi;
+    win_T	*wp = NULL;
+
+    qi = qf_cmd_get_or_alloc_stack(eap, &wp);
+    if (qi == NULL)
+	return FAIL;
+
+    if ((tv->v_type == VAR_STRING && tv->vval.v_string != NULL)
+	    || (tv->v_type == VAR_LIST && tv->vval.v_list != NULL))
+    {
+	int	res;
+	int_u	save_qfid;
+	char_u	*au_name = cexpr_get_auname(eap->cmdidx);
+
+	incr_quickfix_busy();
+	res = qf_init_ext(qi, qi->qf_curlist, NULL, NULL, tv, p_efm,
+			(eap->cmdidx != CMD_caddexpr
+			 && eap->cmdidx != CMD_laddexpr),
+			     (linenr_T)0, (linenr_T)0,
+			     qf_cmdtitle(*eap->cmdlinep), NULL);
+	if (qf_stack_empty(qi))
+	{
+	    decr_quickfix_busy();
+	    return FAIL;
+	}
+	if (res >= 0)
+	    qf_list_changed(qf_get_curlist(qi));
+
+	// Remember the current quickfix list identifier, so that we can
+	// check for autocommands changing the current quickfix list.
+	save_qfid = qf_get_curlist(qi)->qf_id;
+	if (au_name != NULL)
+	    apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
+					    curbuf->b_fname, TRUE, curbuf);
+
+	// Jump to the first error for a new list and if autocmds didn't
+	// free the list.
+	if (res > 0 && (eap->cmdidx == CMD_cexpr || eap->cmdidx == CMD_lexpr)
+		&& qflist_valid(wp, save_qfid))
+	    // display the first error
+	    qf_jump_first(qi, save_qfid, eap->forceit);
+	decr_quickfix_busy();
+	return OK;
+    }
+
+    emsg(_(e_string_or_list_expected));
+    return FAIL;
+}
+
+/*
+ * ":cexpr {expr}", ":cgetexpr {expr}", ":caddexpr {expr}" command.
+ * ":lexpr {expr}", ":lgetexpr {expr}", ":laddexpr {expr}" command.
+ * Also: ":caddexpr", ":cgetexpr", "laddexpr" and "laddexpr".
+ */
+    void
+ex_cexpr(exarg_T *eap)
+{
+    typval_T	*tv;
+
+    if (trigger_cexpr_autocmd(eap->cmdidx) == FAIL)
+	return;
+
+    // Evaluate the expression.  When the result is a string or a list we can
+    // use it to fill the errorlist.
+    tv = eval_expr(eap->arg, eap);
+    if (tv == NULL)
+	return;
+
+    (void)cexpr_core(eap, tv);
+    free_tv(tv);
+}
+#endif
+
+/*
+ * Get the location list for ":lhelpgrep"
+ */
+    static qf_info_T *
+hgr_get_ll(int *new_ll)
+{
+    win_T	*wp;
+    qf_info_T	*qi;
+
+    // If the current window is a help window, then use it
+    if (bt_help(curwin->w_buffer))
+	wp = curwin;
+    else
+	// Find an existing help window
+	wp = qf_find_help_win();
+
+    if (wp == NULL)	    // Help window not found
+	qi = NULL;
+    else
+	qi = wp->w_llist;
+
+    if (qi == NULL)
+    {
+	// Allocate a new location list for help text matches
+	if ((qi = qf_alloc_stack(QFLT_LOCATION)) == NULL)
+	    return NULL;
+	*new_ll = TRUE;
+    }
+
+    return qi;
+}
+
+/*
+ * Search for a pattern in a help file.
+ */
+    static void
+hgr_search_file(
+	qf_list_T *qfl,
+	char_u *fname,
+	vimconv_T *p_vc,
+	regmatch_T *p_regmatch)
+{
+    FILE	*fd;
+    long	lnum;
+
+    fd = mch_fopen((char *)fname, "r");
+    if (fd == NULL)
+	return;
+
+    lnum = 1;
+    while (!vim_fgets(IObuff, IOSIZE, fd) && !got_int)
+    {
+	char_u    *line = IObuff;
+
+	// Convert a line if 'encoding' is not utf-8 and
+	// the line contains a non-ASCII character.
+	if (p_vc->vc_type != CONV_NONE && has_non_ascii(IObuff))
+	{
+	    line = string_convert(p_vc, IObuff, NULL);
+	    if (line == NULL)
+		line = IObuff;
+	}
+
+	if (vim_regexec(p_regmatch, line, (colnr_T)0))
+	{
+	    int	l = (int)STRLEN(line);
+
+	    // remove trailing CR, LF, spaces, etc.
+	    while (l > 0 && line[l - 1] <= ' ')
+		line[--l] = NUL;
+
+	    if (qf_add_entry(qfl,
+			NULL,	// dir
+			fname,
+			NULL,
+			0,
+			line,
+			lnum,
+			0,
+			(int)(p_regmatch->startp[0] - line)
+			+ 1,	// col
+			(int)(p_regmatch->endp[0] - line)
+			+ 1,	// end_col
+			FALSE,	// vis_col
+			NULL,	// search pattern
+			0,	// nr
+			1,	// type
+			TRUE	// valid
+			) == QF_FAIL)
+	    {
+		got_int = TRUE;
+		if (line != IObuff)
+		    vim_free(line);
+		break;
+	    }
+	}
+	if (line != IObuff)
+	    vim_free(line);
+	++lnum;
+	line_breakcheck();
+    }
+    fclose(fd);
+}
+
+/*
+ * Search for a pattern in all the help files in the doc directory under
+ * the given directory.
+ */
+    static void
+hgr_search_files_in_dir(
+	qf_list_T *qfl,
+	char_u *dirname,
+	regmatch_T *p_regmatch,
+	vimconv_T *p_vc
+#ifdef FEAT_MULTI_LANG
+	, char_u *lang
+#endif
+	)
+{
+    int		fcount;
+    char_u	**fnames;
+    int		fi;
+
+    // Find all "*.txt" and "*.??x" files in the "doc" directory.
+    add_pathsep(dirname);
+    STRCAT(dirname, "doc/*.\\(txt\\|??x\\)");
+    if (gen_expand_wildcards(1, &dirname, &fcount,
+		&fnames, EW_FILE|EW_SILENT) == OK
+	    && fcount > 0)
+    {
+	for (fi = 0; fi < fcount && !got_int; ++fi)
+	{
+#ifdef FEAT_MULTI_LANG
+	    // Skip files for a different language.
+	    if (lang != NULL
+		    && STRNICMP(lang, fnames[fi]
+				    + STRLEN(fnames[fi]) - 3, 2) != 0
+		    && !(STRNICMP(lang, "en", 2) == 0
+			&& STRNICMP("txt", fnames[fi]
+			    + STRLEN(fnames[fi]) - 3, 3) == 0))
+		continue;
+#endif
+
+	    hgr_search_file(qfl, fnames[fi], p_vc, p_regmatch);
+	}
+	FreeWild(fcount, fnames);
+    }
+}
+
+/*
+ * Search for a pattern in all the help files in the 'runtimepath'
+ * and add the matches to a quickfix list.
+ * 'lang' is the language specifier.  If supplied, then only matches in the
+ * specified language are found.
+ */
+    static void
+hgr_search_in_rtp(qf_list_T *qfl, regmatch_T *p_regmatch, char_u *lang)
+{
+    char_u	*p;
+
+    vimconv_T	vc;
+
+    // Help files are in utf-8 or latin1, convert lines when 'encoding'
+    // differs.
+    vc.vc_type = CONV_NONE;
+    if (!enc_utf8)
+	convert_setup(&vc, (char_u *)"utf-8", p_enc);
+
+    // Go through all the directories in 'runtimepath'
+    p = p_rtp;
+    while (*p != NUL && !got_int)
+    {
+	copy_option_part(&p, NameBuff, MAXPATHL, ",");
+
+	hgr_search_files_in_dir(qfl, NameBuff, p_regmatch, &vc
+#ifdef FEAT_MULTI_LANG
+		, lang
+#endif
+		);
+    }
+
+    if (vc.vc_type != CONV_NONE)
+	convert_setup(&vc, NULL, NULL);
+}
+
+/*
+ * ":helpgrep {pattern}"
+ */
+    void
+ex_helpgrep(exarg_T *eap)
+{
+    regmatch_T	regmatch;
+    char_u	*save_cpo;
+    int		save_cpo_allocated;
+    qf_info_T	*qi = &ql_info;
+    int		new_qi = FALSE;
+    char_u	*au_name =  NULL;
+    char_u	*lang = NULL;
+    int		updated = FALSE;
+
+    switch (eap->cmdidx)
+    {
+	case CMD_helpgrep:  au_name = (char_u *)"helpgrep"; break;
+	case CMD_lhelpgrep: au_name = (char_u *)"lhelpgrep"; break;
+	default: break;
+    }
+    if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
+					       curbuf->b_fname, TRUE, curbuf))
+    {
+#ifdef FEAT_EVAL
+	if (aborting())
+	    return;
+#endif
+    }
+
+    if (is_loclist_cmd(eap->cmdidx))
+    {
+	qi = hgr_get_ll(&new_qi);
+	if (qi == NULL)
+	    return;
+    }
+
+    // Make 'cpoptions' empty, the 'l' flag should not be used here.
+    save_cpo = p_cpo;
+    save_cpo_allocated = is_option_allocated("cpo");
+    p_cpo = empty_option;
+
+    incr_quickfix_busy();
+
+#ifdef FEAT_MULTI_LANG
+    // Check for a specified language
+    lang = check_help_lang(eap->arg);
+#endif
+    regmatch.regprog = vim_regcomp(eap->arg, RE_MAGIC + RE_STRING);
+    regmatch.rm_ic = FALSE;
+    if (regmatch.regprog != NULL)
+    {
+	qf_list_T	*qfl;
+
+	// create a new quickfix list
+	qf_new_list(qi, qf_cmdtitle(*eap->cmdlinep));
+	qfl = qf_get_curlist(qi);
+
+	hgr_search_in_rtp(qfl, &regmatch, lang);
+
+	vim_regfree(regmatch.regprog);
+
+	qfl->qf_nonevalid = FALSE;
+	qfl->qf_ptr = qfl->qf_start;
+	qfl->qf_index = 1;
+	qf_list_changed(qfl);
+	updated = TRUE;
+    }
+
+    if (p_cpo == empty_option)
+	p_cpo = save_cpo;
+    else
+    {
+	// Darn, some plugin changed the value.  If it's still empty it was
+	// changed and restored, need to restore in the complicated way.
+	if (*p_cpo == NUL)
+	    set_option_value_give_err((char_u *)"cpo", 0L, save_cpo, 0);
+	if (save_cpo_allocated)
+	    free_string_option(save_cpo);
+    }
+
+    if (updated)
+	// This may open a window and source scripts, do this after 'cpo' was
+	// restored.
+	qf_update_buffer(qi, NULL);
+
+    if (au_name != NULL)
+    {
+	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
+					       curbuf->b_fname, TRUE, curbuf);
+	// When adding a location list to an existing location list stack,
+	// if the autocmd made the stack invalid, then just return.
+	if (!new_qi && IS_LL_STACK(qi) && qf_find_win_with_loclist(qi) == NULL)
+	{
+	    decr_quickfix_busy();
+	    return;
+	}
+    }
+
+    // Jump to first match.
+    if (!qf_list_empty(qf_get_curlist(qi)))
+	qf_jump(qi, 0, 0, FALSE);
+    else
+	semsg(_(e_no_match_str_2), eap->arg);
+
+    decr_quickfix_busy();
+
+    if (eap->cmdidx == CMD_lhelpgrep)
+    {
+	// If the help window is not opened or if it already points to the
+	// correct location list, then free the new location list.
+	if (!bt_help(curwin->w_buffer) || curwin->w_llist == qi)
+	{
+	    if (new_qi)
+		ll_free_all(&qi);
+	}
+	else if (curwin->w_llist == NULL && new_qi)
+	    // current window didn't have a location list associated with it
+	    // before. Associate the new location list now.
+	    curwin->w_llist = qi;
+    }
+}
+
+# if defined(EXITFREE) || defined(PROTO)
+    void
+free_quickfix(void)
+{
+    win_T	*win;
+    tabpage_T	*tab;
+
+    qf_free_all(NULL);
+    // Free all location lists
+    FOR_ALL_TAB_WINDOWS(tab, win)
+	qf_free_all(win);
+
+    ga_clear(&qfga);
+}
+# endif
+
+#endif // FEAT_QUICKFIX
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+# ifdef FEAT_QUICKFIX
+    static void
+get_qf_loc_list(int is_qf, win_T *wp, typval_T *what_arg, typval_T *rettv)
+{
+    if (what_arg->v_type == VAR_UNKNOWN)
+    {
+	if (rettv_list_alloc(rettv) == OK)
+	    if (is_qf || wp != NULL)
+		(void)get_errorlist(NULL, wp, -1, 0, rettv->vval.v_list);
+    }
+    else
+    {
+	if (rettv_dict_alloc(rettv) == OK)
+	    if (is_qf || (wp != NULL))
+	    {
+		if (what_arg->v_type == VAR_DICT)
+		{
+		    dict_T	*d = what_arg->vval.v_dict;
+
+		    if (d != NULL)
+			qf_get_properties(wp, d, rettv->vval.v_dict);
+		}
+		else
+		    emsg(_(e_dictionary_required));
+	    }
+    }
+}
+# endif
+
+/*
+ * "getloclist()" function
+ */
+    void
+f_getloclist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
+{
+# ifdef FEAT_QUICKFIX
+    win_T	*wp;
+
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_opt_dict_arg(argvars, 1) == FAIL))
+	return;
+
+    wp = find_win_by_nr_or_id(&argvars[0]);
+    get_qf_loc_list(FALSE, wp, &argvars[1], rettv);
+# endif
+}
+
+/*
+ * "getqflist()" function
+ */
+    void
+f_getqflist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
+{
+# ifdef FEAT_QUICKFIX
+    if (in_vim9script() && check_for_opt_dict_arg(argvars, 0) == FAIL)
+	return;
+
+    get_qf_loc_list(TRUE, NULL, &argvars[0], rettv);
+# endif
+}
+
+/*
+ * Used by "setqflist()" and "setloclist()" functions
+ */
+    static void
+set_qf_ll_list(
+    win_T	*wp UNUSED,
+    typval_T	*list_arg UNUSED,
+    typval_T	*action_arg UNUSED,
+    typval_T	*what_arg UNUSED,
+    typval_T	*rettv)
+{
+# ifdef FEAT_QUICKFIX
+    char_u	*act;
+    int		action = 0;
+    static int	recursive = 0;
+# endif
+
+    rettv->vval.v_number = -1;
+
+# ifdef FEAT_QUICKFIX
+    if (list_arg->v_type != VAR_LIST)
+	emsg(_(e_list_required));
+    else if (recursive != 0)
+	emsg(_(e_autocommand_caused_recursive_behavior));
+    else
+    {
+	list_T  *l = list_arg->vval.v_list;
+	dict_T	*what = NULL;
+	int	valid_dict = TRUE;
+
+	if (action_arg->v_type == VAR_STRING)
+	{
+	    act = tv_get_string_chk(action_arg);
+	    if (act == NULL)
+		return;		// type error; errmsg already given
+	    if ((*act == 'a' || *act == 'r' || *act == ' ' || *act == 'f') &&
+		    act[1] == NUL)
+		action = *act;
+	    else
+		semsg(_(e_invalid_action_str_1), act);
+	}
+	else if (action_arg->v_type == VAR_UNKNOWN)
+	    action = ' ';
+	else
+	    emsg(_(e_string_required));
+
+	if (action_arg->v_type != VAR_UNKNOWN
+		&& what_arg->v_type != VAR_UNKNOWN)
+	{
+	    if (what_arg->v_type == VAR_DICT && what_arg->vval.v_dict != NULL)
+		what = what_arg->vval.v_dict;
+	    else
+	    {
+		emsg(_(e_dictionary_required));
+		valid_dict = FALSE;
+	    }
+	}
+
+	++recursive;
+	if (l != NULL && action && valid_dict
+		    && set_errorlist(wp, l, action,
+		     (char_u *)(wp == NULL ? ":setqflist()" : ":setloclist()"),
+		     what) == OK)
+	    rettv->vval.v_number = 0;
+	--recursive;
+    }
+# endif
+}
+
+/*
+ * "setloclist()" function
+ */
+    void
+f_setloclist(typval_T *argvars, typval_T *rettv)
+{
+    win_T	*win;
+
+    rettv->vval.v_number = -1;
+
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_list_arg(argvars, 1) == FAIL
+		|| check_for_opt_string_arg(argvars, 2) == FAIL
+		|| (argvars[2].v_type != VAR_UNKNOWN
+		    && check_for_opt_dict_arg(argvars, 3) == FAIL)))
+	return;
+
+    win = find_win_by_nr_or_id(&argvars[0]);
+    if (win != NULL)
+	set_qf_ll_list(win, &argvars[1], &argvars[2], &argvars[3], rettv);
+}
+
+/*
+ * "setqflist()" function
+ */
+    void
+f_setqflist(typval_T *argvars, typval_T *rettv)
+{
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_opt_string_arg(argvars, 1) == FAIL
+		|| (argvars[1].v_type != VAR_UNKNOWN
+		    && check_for_opt_dict_arg(argvars, 2) == FAIL)))
+	return;
+
+    set_qf_ll_list(NULL, &argvars[0], &argvars[1], &argvars[2], rettv);
+}
+#endif