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, 3052 insertions, 0 deletions

diff --git a/src/register.c b/src/register.c
new file mode 100644
index 0000000..f3df79c
--- /dev/null
+++ b/src/register.c
@@ -0,0 +1,3052 @@
+/* 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.
+ */
+
+/*
+ * register.c: functions for managing registers
+ */
+
+#include "vim.h"
+
+/*
+ * Registers:
+ *	0 = unnamed register, for normal yanks and puts
+ *   1..9 = registers '1' to '9', for deletes
+ * 10..35 = registers 'a' to 'z' ('A' to 'Z' for appending)
+ *     36 = delete register '-'
+ *     37 = Selection register '*'. Only if FEAT_CLIPBOARD defined
+ *     38 = Clipboard register '+'. Only if FEAT_CLIPBOARD and FEAT_X11 defined
+ */
+static yankreg_T	y_regs[NUM_REGISTERS];
+
+static yankreg_T	*y_current;	    // ptr to current yankreg
+static int		y_append;	    // TRUE when appending
+static yankreg_T	*y_previous = NULL; // ptr to last written yankreg
+
+static int	stuff_yank(int, char_u *);
+static void	put_reedit_in_typebuf(int silent);
+static int	put_in_typebuf(char_u *s, int esc, int colon,
+								 int silent);
+static int	yank_copy_line(struct block_def *bd, long y_idx, int exclude_trailing_space);
+#ifdef FEAT_CLIPBOARD
+static void	copy_yank_reg(yankreg_T *reg);
+#endif
+static void	dis_msg(char_u *p, int skip_esc);
+
+#if defined(FEAT_VIMINFO) || defined(PROTO)
+    yankreg_T *
+get_y_regs(void)
+{
+    return y_regs;
+}
+#endif
+
+#if defined(FEAT_CLIPBOARD) || defined(PROTO)
+    yankreg_T *
+get_y_register(int reg)
+{
+    return &y_regs[reg];
+}
+#endif
+
+    yankreg_T *
+get_y_current(void)
+{
+    return y_current;
+}
+
+    yankreg_T *
+get_y_previous(void)
+{
+    return y_previous;
+}
+
+    void
+set_y_current(yankreg_T *yreg)
+{
+    y_current = yreg;
+}
+
+    void
+set_y_previous(yankreg_T *yreg)
+{
+    y_previous = yreg;
+}
+
+    void
+reset_y_append(void)
+{
+    y_append = FALSE;
+}
+
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * Keep the last expression line here, for repeating.
+ */
+static char_u	*expr_line = NULL;
+static exarg_T	*expr_eap = NULL;
+
+/*
+ * Get an expression for the "\"=expr1" or "CTRL-R =expr1"
+ * Returns '=' when OK, NUL otherwise.
+ */
+    int
+get_expr_register(void)
+{
+    char_u	*new_line;
+
+    new_line = getcmdline('=', 0L, 0, 0);
+    if (new_line == NULL)
+	return NUL;
+    if (*new_line == NUL)	// use previous line
+	vim_free(new_line);
+    else
+	set_expr_line(new_line, NULL);
+    return '=';
+}
+
+/*
+ * Set the expression for the '=' register.
+ * Argument must be an allocated string.
+ * "eap" may be used if the next line needs to be checked when evaluating the
+ * expression.
+ */
+    void
+set_expr_line(char_u *new_line, exarg_T *eap)
+{
+    vim_free(expr_line);
+    expr_line = new_line;
+    expr_eap = eap;
+}
+
+/*
+ * Get the result of the '=' register expression.
+ * Returns a pointer to allocated memory, or NULL for failure.
+ */
+    char_u *
+get_expr_line(void)
+{
+    char_u	*expr_copy;
+    char_u	*rv;
+    static int	nested = 0;
+
+    if (expr_line == NULL)
+	return NULL;
+
+    // Make a copy of the expression, because evaluating it may cause it to be
+    // changed.
+    expr_copy = vim_strsave(expr_line);
+    if (expr_copy == NULL)
+	return NULL;
+
+    // When we are invoked recursively limit the evaluation to 10 levels.
+    // Then return the string as-is.
+    if (nested >= 10)
+	return expr_copy;
+
+    ++nested;
+    rv = eval_to_string_eap(expr_copy, TRUE, expr_eap, FALSE);
+    --nested;
+    vim_free(expr_copy);
+    return rv;
+}
+
+/*
+ * Get the '=' register expression itself, without evaluating it.
+ */
+    static char_u *
+get_expr_line_src(void)
+{
+    if (expr_line == NULL)
+	return NULL;
+    return vim_strsave(expr_line);
+}
+#endif // FEAT_EVAL
+
+/*
+ * Check if 'regname' is a valid name of a yank register.
+ * Note: There is no check for 0 (default register), caller should do this
+ */
+    int
+valid_yank_reg(
+    int	    regname,
+    int	    writing)	    // if TRUE check for writable registers
+{
+    if (       (regname > 0 && ASCII_ISALNUM(regname))
+	    || (!writing && vim_strchr((char_u *)
+#ifdef FEAT_EVAL
+				    "/.%:="
+#else
+				    "/.%:"
+#endif
+					, regname) != NULL)
+	    || regname == '#'
+	    || regname == '"'
+	    || regname == '-'
+	    || regname == '_'
+#ifdef FEAT_CLIPBOARD
+	    || regname == '*'
+	    || regname == '+'
+#endif
+#ifdef FEAT_DND
+	    || (!writing && regname == '~')
+#endif
+							)
+	return TRUE;
+    return FALSE;
+}
+
+/*
+ * Set y_current and y_append, according to the value of "regname".
+ * Cannot handle the '_' register.
+ * Must only be called with a valid register name!
+ *
+ * If regname is 0 and writing, use register 0
+ * If regname is 0 and reading, use previous register
+ *
+ * Return TRUE when the register should be inserted literally (selection or
+ * clipboard).
+ */
+    int
+get_yank_register(int regname, int writing)
+{
+    int	    i;
+    int	    ret = FALSE;
+
+    y_append = FALSE;
+    if ((regname == 0 || regname == '"') && !writing && y_previous != NULL)
+    {
+	y_current = y_previous;
+	return ret;
+    }
+    i = regname;
+    if (VIM_ISDIGIT(i))
+	i -= '0';
+    else if (ASCII_ISLOWER(i))
+	i = CharOrdLow(i) + 10;
+    else if (ASCII_ISUPPER(i))
+    {
+	i = CharOrdUp(i) + 10;
+	y_append = TRUE;
+    }
+    else if (regname == '-')
+	i = DELETION_REGISTER;
+#ifdef FEAT_CLIPBOARD
+    // When selection is not available, use register 0 instead of '*'
+    else if (clip_star.available && regname == '*')
+    {
+	i = STAR_REGISTER;
+	ret = TRUE;
+    }
+    // When clipboard is not available, use register 0 instead of '+'
+    else if (clip_plus.available && regname == '+')
+    {
+	i = PLUS_REGISTER;
+	ret = TRUE;
+    }
+#endif
+#ifdef FEAT_DND
+    else if (!writing && regname == '~')
+	i = TILDE_REGISTER;
+#endif
+    else		// not 0-9, a-z, A-Z or '-': use register 0
+	i = 0;
+    y_current = &(y_regs[i]);
+    if (writing)	// remember the register we write into for do_put()
+	y_previous = y_current;
+    return ret;
+}
+
+/*
+ * Obtain the contents of a "normal" register. The register is made empty.
+ * The returned pointer has allocated memory, use put_register() later.
+ */
+    void *
+get_register(
+    int		name,
+    int		copy)	// make a copy, if FALSE make register empty.
+{
+    yankreg_T	*reg;
+    int		i;
+
+#ifdef FEAT_CLIPBOARD
+    // When Visual area changed, may have to update selection.  Obtain the
+    // selection too.
+    if (name == '*' && clip_star.available)
+    {
+	if (clip_isautosel_star())
+	    clip_update_selection(&clip_star);
+	may_get_selection(name);
+    }
+    if (name == '+' && clip_plus.available)
+    {
+	if (clip_isautosel_plus())
+	    clip_update_selection(&clip_plus);
+	may_get_selection(name);
+    }
+#endif
+
+    get_yank_register(name, 0);
+    reg = ALLOC_ONE(yankreg_T);
+    if (reg == NULL)
+	return (void *)NULL;
+
+    *reg = *y_current;
+    if (copy)
+    {
+	// If we run out of memory some or all of the lines are empty.
+	if (reg->y_size == 0)
+	    reg->y_array = NULL;
+	else
+	    reg->y_array = ALLOC_MULT(char_u *, reg->y_size);
+	if (reg->y_array != NULL)
+	{
+	    for (i = 0; i < reg->y_size; ++i)
+		reg->y_array[i] = vim_strsave(y_current->y_array[i]);
+	}
+    }
+    else
+	y_current->y_array = NULL;
+    return (void *)reg;
+}
+
+/*
+ * Put "reg" into register "name".  Free any previous contents and "reg".
+ */
+    void
+put_register(int name, void *reg)
+{
+    get_yank_register(name, 0);
+    free_yank_all();
+    *y_current = *(yankreg_T *)reg;
+    vim_free(reg);
+
+#ifdef FEAT_CLIPBOARD
+    // Send text written to clipboard register to the clipboard.
+    may_set_selection();
+#endif
+}
+
+#if defined(FEAT_CLIPBOARD) || defined(PROTO)
+    void
+free_register(void *reg)
+{
+    yankreg_T tmp;
+
+    tmp = *y_current;
+    *y_current = *(yankreg_T *)reg;
+    free_yank_all();
+    vim_free(reg);
+    *y_current = tmp;
+}
+#endif
+
+/*
+ * return TRUE if the current yank register has type MLINE
+ */
+    int
+yank_register_mline(int regname)
+{
+    if (regname != 0 && !valid_yank_reg(regname, FALSE))
+	return FALSE;
+    if (regname == '_')		// black hole is always empty
+	return FALSE;
+    get_yank_register(regname, FALSE);
+    return (y_current->y_type == MLINE);
+}
+
+/*
+ * Start or stop recording into a yank register.
+ *
+ * Return FAIL for failure, OK otherwise.
+ */
+    int
+do_record(int c)
+{
+    char_u	    *p;
+    static int	    regname;
+    yankreg_T	    *old_y_previous, *old_y_current;
+    int		    retval;
+
+    if (reg_recording == 0)	    // start recording
+    {
+	// registers 0-9, a-z and " are allowed
+	if (c < 0 || (!ASCII_ISALNUM(c) && c != '"'))
+	    retval = FAIL;
+	else
+	{
+	    reg_recording = c;
+	    showmode();
+	    regname = c;
+	    retval = OK;
+	}
+    }
+    else			    // stop recording
+    {
+	// Get the recorded key hits.  K_SPECIAL and CSI will be escaped, this
+	// needs to be removed again to put it in a register.  exec_reg then
+	// adds the escaping back later.
+	reg_recording = 0;
+	msg("");
+	p = get_recorded();
+	if (p == NULL)
+	    retval = FAIL;
+	else
+	{
+	    // Remove escaping for CSI and K_SPECIAL in multi-byte chars.
+	    vim_unescape_csi(p);
+
+	    // We don't want to change the default register here, so save and
+	    // restore the current register name.
+	    old_y_previous = y_previous;
+	    old_y_current = y_current;
+
+	    retval = stuff_yank(regname, p);
+
+	    y_previous = old_y_previous;
+	    y_current = old_y_current;
+	}
+    }
+    return retval;
+}
+
+/*
+ * Stuff string "p" into yank register "regname" as a single line (append if
+ * uppercase).	"p" must have been alloced.
+ *
+ * return FAIL for failure, OK otherwise
+ */
+    static int
+stuff_yank(int regname, char_u *p)
+{
+    char_u	*lp;
+    char_u	**pp;
+
+    // check for read-only register
+    if (regname != 0 && !valid_yank_reg(regname, TRUE))
+    {
+	vim_free(p);
+	return FAIL;
+    }
+    if (regname == '_')		    // black hole: don't do anything
+    {
+	vim_free(p);
+	return OK;
+    }
+    get_yank_register(regname, TRUE);
+    if (y_append && y_current->y_array != NULL)
+    {
+	pp = &(y_current->y_array[y_current->y_size - 1]);
+	lp = alloc(STRLEN(*pp) + STRLEN(p) + 1);
+	if (lp == NULL)
+	{
+	    vim_free(p);
+	    return FAIL;
+	}
+	STRCPY(lp, *pp);
+	STRCAT(lp, p);
+	vim_free(p);
+	vim_free(*pp);
+	*pp = lp;
+    }
+    else
+    {
+	free_yank_all();
+	if ((y_current->y_array = ALLOC_ONE(char_u *)) == NULL)
+	{
+	    vim_free(p);
+	    return FAIL;
+	}
+	y_current->y_array[0] = p;
+	y_current->y_size = 1;
+	y_current->y_type = MCHAR;  // used to be MLINE, why?
+#ifdef FEAT_VIMINFO
+	y_current->y_time_set = vim_time();
+#endif
+    }
+    return OK;
+}
+
+/*
+ * Last executed register (@ command)
+ */
+static int execreg_lastc = NUL;
+
+#if defined(FEAT_VIMINFO) || defined(PROTO)
+    int
+get_execreg_lastc(void)
+{
+    return execreg_lastc;
+}
+
+    void
+set_execreg_lastc(int lastc)
+{
+    execreg_lastc = lastc;
+}
+#endif
+
+/*
+ * When executing a register as a series of ex-commands, if the
+ * line-continuation character is used for a line, then join it with one or
+ * more previous lines. Note that lines are processed backwards starting from
+ * the last line in the register.
+ *
+ * Arguments:
+ *   lines - list of lines in the register
+ *   idx - index of the line starting with \ or "\. Join this line with all the
+ *	   immediate predecessor lines that start with a \ and the first line
+ *	   that doesn't start with a \. Lines that start with a comment "\
+ *	   character are ignored.
+ *
+ * Returns the concatenated line. The index of the line that should be
+ * processed next is returned in idx.
+ */
+    static char_u *
+execreg_line_continuation(char_u **lines, long *idx)
+{
+    garray_T	ga;
+    long	i = *idx;
+    char_u	*p;
+    int		cmd_start;
+    int		cmd_end = i;
+    int		j;
+    char_u	*str;
+
+    ga_init2(&ga, sizeof(char_u), 400);
+
+    // search backwards to find the first line of this command.
+    // Any line not starting with \ or "\ is the start of the
+    // command.
+    while (--i > 0)
+    {
+	p = skipwhite(lines[i]);
+	if (*p != '\\' && (p[0] != '"' || p[1] != '\\' || p[2] != ' '))
+	    break;
+    }
+    cmd_start = i;
+
+    // join all the lines
+    ga_concat(&ga, lines[cmd_start]);
+    for (j = cmd_start + 1; j <= cmd_end; j++)
+    {
+	p = skipwhite(lines[j]);
+	if (*p == '\\')
+	{
+	    // Adjust the growsize to the current length to
+	    // speed up concatenating many lines.
+	    if (ga.ga_len > 400)
+	    {
+		if (ga.ga_len > 8000)
+		    ga.ga_growsize = 8000;
+		else
+		    ga.ga_growsize = ga.ga_len;
+	    }
+	    ga_concat(&ga, p + 1);
+	}
+    }
+    ga_append(&ga, NUL);
+    str = vim_strsave(ga.ga_data);
+    ga_clear(&ga);
+
+    *idx = i;
+    return str;
+}
+
+/*
+ * Execute a yank register: copy it into the stuff buffer.
+ *
+ * Return FAIL for failure, OK otherwise.
+ */
+    int
+do_execreg(
+    int	    regname,
+    int	    colon,		// insert ':' before each line
+    int	    addcr,		// always add '\n' to end of line
+    int	    silent)		// set "silent" flag in typeahead buffer
+{
+    long	i;
+    char_u	*p;
+    int		retval = OK;
+    int		remap;
+
+    // repeat previous one
+    if (regname == '@')
+    {
+	if (execreg_lastc == NUL)
+	{
+	    emsg(_(e_no_previously_used_register));
+	    return FAIL;
+	}
+	regname = execreg_lastc;
+    }
+    // check for valid regname
+    if (regname == '%' || regname == '#' || !valid_yank_reg(regname, FALSE))
+    {
+	emsg_invreg(regname);
+	return FAIL;
+    }
+    execreg_lastc = regname;
+
+#ifdef FEAT_CLIPBOARD
+    regname = may_get_selection(regname);
+#endif
+
+    // black hole: don't stuff anything
+    if (regname == '_')
+	return OK;
+
+    // use last command line
+    if (regname == ':')
+    {
+	if (last_cmdline == NULL)
+	{
+	    emsg(_(e_no_previous_command_line));
+	    return FAIL;
+	}
+	// don't keep the cmdline containing @:
+	VIM_CLEAR(new_last_cmdline);
+	// Escape all control characters with a CTRL-V
+	p = vim_strsave_escaped_ext(last_cmdline,
+		    (char_u *)"\001\002\003\004\005\006\007"
+			  "\010\011\012\013\014\015\016\017"
+			  "\020\021\022\023\024\025\026\027"
+			  "\030\031\032\033\034\035\036\037",
+		    Ctrl_V, FALSE);
+	if (p != NULL)
+	{
+	    // When in Visual mode "'<,'>" will be prepended to the command.
+	    // Remove it when it's already there.
+	    if (VIsual_active && STRNCMP(p, "'<,'>", 5) == 0)
+		retval = put_in_typebuf(p + 5, TRUE, TRUE, silent);
+	    else
+		retval = put_in_typebuf(p, TRUE, TRUE, silent);
+	}
+	vim_free(p);
+    }
+#ifdef FEAT_EVAL
+    else if (regname == '=')
+    {
+	p = get_expr_line();
+	if (p == NULL)
+	    return FAIL;
+	retval = put_in_typebuf(p, TRUE, colon, silent);
+	vim_free(p);
+    }
+#endif
+    else if (regname == '.')		// use last inserted text
+    {
+	p = get_last_insert_save();
+	if (p == NULL)
+	{
+	    emsg(_(e_no_inserted_text_yet));
+	    return FAIL;
+	}
+	retval = put_in_typebuf(p, FALSE, colon, silent);
+	vim_free(p);
+    }
+    else
+    {
+	get_yank_register(regname, FALSE);
+	if (y_current->y_array == NULL)
+	    return FAIL;
+
+	// Disallow remapping for ":@r".
+	remap = colon ? REMAP_NONE : REMAP_YES;
+
+	// Insert lines into typeahead buffer, from last one to first one.
+	put_reedit_in_typebuf(silent);
+	for (i = y_current->y_size; --i >= 0; )
+	{
+	    char_u *escaped;
+	    char_u *str;
+	    int	    free_str = FALSE;
+
+	    // insert NL between lines and after last line if type is MLINE
+	    if (y_current->y_type == MLINE || i < y_current->y_size - 1
+								     || addcr)
+	    {
+		if (ins_typebuf((char_u *)"\n", remap, 0, TRUE, silent) == FAIL)
+		    return FAIL;
+	    }
+
+	    // Handle line-continuation for :@<register>
+	    str = y_current->y_array[i];
+	    if (colon && i > 0)
+	    {
+		p = skipwhite(str);
+		if (*p == '\\' || (p[0] == '"' && p[1] == '\\' && p[2] == ' '))
+		{
+		    str = execreg_line_continuation(y_current->y_array, &i);
+		    if (str == NULL)
+			return FAIL;
+		    free_str = TRUE;
+		}
+	    }
+	    escaped = vim_strsave_escape_csi(str);
+	    if (free_str)
+		vim_free(str);
+	    if (escaped == NULL)
+		return FAIL;
+	    retval = ins_typebuf(escaped, remap, 0, TRUE, silent);
+	    vim_free(escaped);
+	    if (retval == FAIL)
+		return FAIL;
+	    if (colon && ins_typebuf((char_u *)":", remap, 0, TRUE, silent)
+								      == FAIL)
+		return FAIL;
+	}
+	reg_executing = regname == 0 ? '"' : regname; // disable "q" command
+    }
+    return retval;
+}
+
+/*
+ * If "restart_edit" is not zero, put it in the typeahead buffer, so that it's
+ * used only after other typeahead has been processed.
+ */
+    static void
+put_reedit_in_typebuf(int silent)
+{
+    char_u	buf[3];
+
+    if (restart_edit == NUL)
+	return;
+
+    if (restart_edit == 'V')
+    {
+	buf[0] = 'g';
+	buf[1] = 'R';
+	buf[2] = NUL;
+    }
+    else
+    {
+	buf[0] = restart_edit == 'I' ? 'i' : restart_edit;
+	buf[1] = NUL;
+    }
+    if (ins_typebuf(buf, REMAP_NONE, 0, TRUE, silent) == OK)
+	restart_edit = NUL;
+}
+
+/*
+ * Insert register contents "s" into the typeahead buffer, so that it will be
+ * executed again.
+ * When "esc" is TRUE it is to be taken literally: Escape CSI characters and
+ * no remapping.
+ */
+    static int
+put_in_typebuf(
+    char_u	*s,
+    int		esc,
+    int		colon,	    // add ':' before the line
+    int		silent)
+{
+    int		retval = OK;
+
+    put_reedit_in_typebuf(silent);
+    if (colon)
+	retval = ins_typebuf((char_u *)"\n", REMAP_NONE, 0, TRUE, silent);
+    if (retval == OK)
+    {
+	char_u	*p;
+
+	if (esc)
+	    p = vim_strsave_escape_csi(s);
+	else
+	    p = s;
+	if (p == NULL)
+	    retval = FAIL;
+	else
+	    retval = ins_typebuf(p, esc ? REMAP_NONE : REMAP_YES,
+							     0, TRUE, silent);
+	if (esc)
+	    vim_free(p);
+    }
+    if (colon && retval == OK)
+	retval = ins_typebuf((char_u *)":", REMAP_NONE, 0, TRUE, silent);
+    return retval;
+}
+
+/*
+ * Insert a yank register: copy it into the Read buffer.
+ * Used by CTRL-R command and middle mouse button in insert mode.
+ *
+ * return FAIL for failure, OK otherwise
+ */
+    int
+insert_reg(
+    int		regname,
+    int		literally_arg)	// insert literally, not as if typed
+{
+    long	i;
+    int		retval = OK;
+    char_u	*arg;
+    int		allocated;
+    int		literally = literally_arg;
+
+    // It is possible to get into an endless loop by having CTRL-R a in
+    // register a and then, in insert mode, doing CTRL-R a.
+    // If you hit CTRL-C, the loop will be broken here.
+    ui_breakcheck();
+    if (got_int)
+	return FAIL;
+
+    // check for valid regname
+    if (regname != NUL && !valid_yank_reg(regname, FALSE))
+	return FAIL;
+
+#ifdef FEAT_CLIPBOARD
+    regname = may_get_selection(regname);
+#endif
+
+    if (regname == '.')			// insert last inserted text
+	retval = stuff_inserted(NUL, 1L, TRUE);
+    else if (get_spec_reg(regname, &arg, &allocated, TRUE))
+    {
+	if (arg == NULL)
+	    return FAIL;
+	stuffescaped(arg, literally);
+	if (allocated)
+	    vim_free(arg);
+    }
+    else				// name or number register
+    {
+	if (get_yank_register(regname, FALSE))
+	    literally = TRUE;
+	if (y_current->y_array == NULL)
+	    retval = FAIL;
+	else
+	{
+	    for (i = 0; i < y_current->y_size; ++i)
+	    {
+		if (regname == '-')
+		{
+		    AppendCharToRedobuff(Ctrl_R);
+		    AppendCharToRedobuff(regname);
+		    do_put(regname, NULL, BACKWARD, 1L, PUT_CURSEND);
+		}
+		else
+		    stuffescaped(y_current->y_array[i], literally);
+		// Insert a newline between lines and after last line if
+		// y_type is MLINE.
+		if (y_current->y_type == MLINE || i < y_current->y_size - 1)
+		    stuffcharReadbuff('\n');
+	    }
+	}
+    }
+
+    return retval;
+}
+
+/*
+ * If "regname" is a special register, return TRUE and store a pointer to its
+ * value in "argp".
+ */
+    int
+get_spec_reg(
+    int		regname,
+    char_u	**argp,
+    int		*allocated,	// return: TRUE when value was allocated
+    int		errmsg)		// give error message when failing
+{
+    int		cnt;
+
+    *argp = NULL;
+    *allocated = FALSE;
+    switch (regname)
+    {
+	case '%':		// file name
+	    if (errmsg)
+		check_fname();	// will give emsg if not set
+	    *argp = curbuf->b_fname;
+	    return TRUE;
+
+	case '#':		// alternate file name
+	    *argp = getaltfname(errmsg);	// may give emsg if not set
+	    return TRUE;
+
+#ifdef FEAT_EVAL
+	case '=':		// result of expression
+	    *argp = get_expr_line();
+	    *allocated = TRUE;
+	    return TRUE;
+#endif
+
+	case ':':		// last command line
+	    if (last_cmdline == NULL && errmsg)
+		emsg(_(e_no_previous_command_line));
+	    *argp = last_cmdline;
+	    return TRUE;
+
+	case '/':		// last search-pattern
+	    if (last_search_pat() == NULL && errmsg)
+		emsg(_(e_no_previous_regular_expression));
+	    *argp = last_search_pat();
+	    return TRUE;
+
+	case '.':		// last inserted text
+	    *argp = get_last_insert_save();
+	    *allocated = TRUE;
+	    if (*argp == NULL && errmsg)
+		emsg(_(e_no_inserted_text_yet));
+	    return TRUE;
+
+	case Ctrl_F:		// Filename under cursor
+	case Ctrl_P:		// Path under cursor, expand via "path"
+	    if (!errmsg)
+		return FALSE;
+	    *argp = file_name_at_cursor(FNAME_MESS | FNAME_HYP
+			    | (regname == Ctrl_P ? FNAME_EXP : 0), 1L, NULL);
+	    *allocated = TRUE;
+	    return TRUE;
+
+	case Ctrl_W:		// word under cursor
+	case Ctrl_A:		// WORD (mnemonic All) under cursor
+	    if (!errmsg)
+		return FALSE;
+	    cnt = find_ident_under_cursor(argp, regname == Ctrl_W
+				   ?  (FIND_IDENT|FIND_STRING) : FIND_STRING);
+	    *argp = cnt ? vim_strnsave(*argp, cnt) : NULL;
+	    *allocated = TRUE;
+	    return TRUE;
+
+	case Ctrl_L:		// Line under cursor
+	    if (!errmsg)
+		return FALSE;
+
+	    *argp = ml_get_buf(curwin->w_buffer,
+			curwin->w_cursor.lnum, FALSE);
+	    return TRUE;
+
+	case '_':		// black hole: always empty
+	    *argp = (char_u *)"";
+	    return TRUE;
+    }
+
+    return FALSE;
+}
+
+/*
+ * Paste a yank register into the command line.
+ * Only for non-special registers.
+ * Used by CTRL-R command in command-line mode
+ * insert_reg() can't be used here, because special characters from the
+ * register contents will be interpreted as commands.
+ *
+ * return FAIL for failure, OK otherwise
+ */
+    int
+cmdline_paste_reg(
+    int regname,
+    int literally_arg,	// Insert text literally instead of "as typed"
+    int remcr)		// don't add CR characters
+{
+    long	i;
+    int		literally = literally_arg;
+
+    if (get_yank_register(regname, FALSE))
+	literally = TRUE;
+    if (y_current->y_array == NULL)
+	return FAIL;
+
+    for (i = 0; i < y_current->y_size; ++i)
+    {
+	cmdline_paste_str(y_current->y_array[i], literally);
+
+	// Insert ^M between lines and after last line if type is MLINE.
+	// Don't do this when "remcr" is TRUE.
+	if ((y_current->y_type == MLINE || i < y_current->y_size - 1) && !remcr)
+	    cmdline_paste_str((char_u *)"\r", literally);
+
+	// Check for CTRL-C, in case someone tries to paste a few thousand
+	// lines and gets bored.
+	ui_breakcheck();
+	if (got_int)
+	    return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Shift the delete registers: "9 is cleared, "8 becomes "9, etc.
+ */
+    void
+shift_delete_registers(void)
+{
+    int		n;
+
+    y_current = &y_regs[9];
+    free_yank_all();			// free register nine
+    for (n = 9; n > 1; --n)
+	y_regs[n] = y_regs[n - 1];
+    y_current = &y_regs[1];
+    if (!y_append)
+	y_previous = y_current;
+    y_regs[1].y_array = NULL;		// set register one to empty
+}
+
+#if defined(FEAT_EVAL)
+    void
+yank_do_autocmd(oparg_T *oap, yankreg_T *reg)
+{
+    static int	    recursive = FALSE;
+    dict_T	    *v_event;
+    list_T	    *list;
+    int		    n;
+    char_u	    buf[NUMBUFLEN + 2];
+    long	    reglen = 0;
+    save_v_event_T  save_v_event;
+
+    if (recursive)
+	return;
+
+    v_event = get_v_event(&save_v_event);
+
+    list = list_alloc();
+    if (list == NULL)
+	return;
+
+    // yanked text contents
+    for (n = 0; n < reg->y_size; n++)
+	list_append_string(list, reg->y_array[n], -1);
+    list->lv_lock = VAR_FIXED;
+    (void)dict_add_list(v_event, "regcontents", list);
+
+    // register name or empty string for unnamed operation
+    buf[0] = (char_u)oap->regname;
+    buf[1] = NUL;
+    (void)dict_add_string(v_event, "regname", buf);
+
+    // motion type: inclusive or exclusive
+    (void)dict_add_bool(v_event, "inclusive", oap->inclusive);
+
+    // kind of operation (yank, delete, change)
+    buf[0] = get_op_char(oap->op_type);
+    buf[1] = get_extra_op_char(oap->op_type);
+    buf[2] = NUL;
+    (void)dict_add_string(v_event, "operator", buf);
+
+    // register type
+    buf[0] = NUL;
+    buf[1] = NUL;
+    switch (get_reg_type(oap->regname, &reglen))
+    {
+	case MLINE: buf[0] = 'V'; break;
+	case MCHAR: buf[0] = 'v'; break;
+	case MBLOCK:
+		vim_snprintf((char *)buf, sizeof(buf), "%c%ld", Ctrl_V,
+			     reglen + 1);
+		break;
+    }
+    (void)dict_add_string(v_event, "regtype", buf);
+
+    // selection type - visual or not
+    (void)dict_add_bool(v_event, "visual", oap->is_VIsual);
+
+    // Lock the dictionary and its keys
+    dict_set_items_ro(v_event);
+
+    recursive = TRUE;
+    textlock++;
+    apply_autocmds(EVENT_TEXTYANKPOST, NULL, NULL, FALSE, curbuf);
+    textlock--;
+    recursive = FALSE;
+
+    // Empty the dictionary, v:event is still valid
+    restore_v_event(v_event, &save_v_event);
+}
+#endif
+
+/*
+ * set all the yank registers to empty (called from main())
+ */
+    void
+init_yank(void)
+{
+    int		i;
+
+    for (i = 0; i < NUM_REGISTERS; ++i)
+	y_regs[i].y_array = NULL;
+}
+
+#if defined(EXITFREE) || defined(PROTO)
+    void
+clear_registers(void)
+{
+    int		i;
+
+    for (i = 0; i < NUM_REGISTERS; ++i)
+    {
+	y_current = &y_regs[i];
+	if (y_current->y_array != NULL)
+	    free_yank_all();
+    }
+}
+#endif
+
+/*
+ * Free "n" lines from the current yank register.
+ * Called for normal freeing and in case of error.
+ */
+    static void
+free_yank(long n)
+{
+    if (y_current->y_array == NULL)
+	return;
+
+    long	    i;
+
+    for (i = n; --i >= 0; )
+	vim_free(y_current->y_array[i]);
+    VIM_CLEAR(y_current->y_array);
+}
+
+    void
+free_yank_all(void)
+{
+    free_yank(y_current->y_size);
+}
+
+/*
+ * Yank the text between "oap->start" and "oap->end" into a yank register.
+ * If we are to append (uppercase register), we first yank into a new yank
+ * register and then concatenate the old and the new one (so we keep the old
+ * one in case of out-of-memory).
+ *
+ * Return FAIL for failure, OK otherwise.
+ */
+    int
+op_yank(oparg_T *oap, int deleting, int mess)
+{
+    long		y_idx;		// index in y_array[]
+    yankreg_T		*curr;		// copy of y_current
+    yankreg_T		newreg;		// new yank register when appending
+    char_u		**new_ptr;
+    linenr_T		lnum;		// current line number
+    long		j;
+    int			yanktype = oap->motion_type;
+    long		yanklines = oap->line_count;
+    linenr_T		yankendlnum = oap->end.lnum;
+    char_u		*p;
+    char_u		*pnew;
+    struct block_def	bd;
+#if defined(FEAT_CLIPBOARD) && defined(FEAT_X11)
+    int			did_star = FALSE;
+#endif
+
+				    // check for read-only register
+    if (oap->regname != 0 && !valid_yank_reg(oap->regname, TRUE))
+    {
+	beep_flush();
+	return FAIL;
+    }
+    if (oap->regname == '_')	    // black hole: nothing to do
+	return OK;
+
+#ifdef FEAT_CLIPBOARD
+    if (!clip_star.available && oap->regname == '*')
+	oap->regname = 0;
+    else if (!clip_plus.available && oap->regname == '+')
+	oap->regname = 0;
+#endif
+
+    if (!deleting)		    // op_delete() already set y_current
+	get_yank_register(oap->regname, TRUE);
+
+    curr = y_current;
+				    // append to existing contents
+    if (y_append && y_current->y_array != NULL)
+	y_current = &newreg;
+    else
+	free_yank_all();	    // free previously yanked lines
+
+    // If the cursor was in column 1 before and after the movement, and the
+    // operator is not inclusive, the yank is always linewise.
+    if (       oap->motion_type == MCHAR
+	    && oap->start.col == 0
+	    && !oap->inclusive
+	    && (!oap->is_VIsual || *p_sel == 'o')
+	    && !oap->block_mode
+	    && oap->end.col == 0
+	    && yanklines > 1)
+    {
+	yanktype = MLINE;
+	--yankendlnum;
+	--yanklines;
+    }
+
+    y_current->y_size = yanklines;
+    y_current->y_type = yanktype;   // set the yank register type
+    y_current->y_width = 0;
+    y_current->y_array = lalloc_clear(sizeof(char_u *) * yanklines, TRUE);
+    if (y_current->y_array == NULL)
+    {
+	y_current = curr;
+	return FAIL;
+    }
+#ifdef FEAT_VIMINFO
+    y_current->y_time_set = vim_time();
+#endif
+
+    y_idx = 0;
+    lnum = oap->start.lnum;
+
+    if (oap->block_mode)
+    {
+	// Visual block mode
+	y_current->y_type = MBLOCK;	    // set the yank register type
+	y_current->y_width = oap->end_vcol - oap->start_vcol;
+
+	if (curwin->w_curswant == MAXCOL && y_current->y_width > 0)
+	    y_current->y_width--;
+    }
+
+    for ( ; lnum <= yankendlnum; lnum++, y_idx++)
+    {
+	switch (y_current->y_type)
+	{
+	    case MBLOCK:
+		block_prep(oap, &bd, lnum, FALSE);
+		if (yank_copy_line(&bd, y_idx, oap->excl_tr_ws) == FAIL)
+		    goto fail;
+		break;
+
+	    case MLINE:
+		if ((y_current->y_array[y_idx] =
+					    vim_strsave(ml_get(lnum))) == NULL)
+		    goto fail;
+		break;
+
+	    case MCHAR:
+		{
+		    colnr_T startcol = 0, endcol = MAXCOL;
+		    int	    is_oneChar = FALSE;
+		    colnr_T cs, ce;
+
+		    p = ml_get(lnum);
+		    bd.startspaces = 0;
+		    bd.endspaces = 0;
+
+		    if (lnum == oap->start.lnum)
+		    {
+			startcol = oap->start.col;
+			if (virtual_op)
+			{
+			    getvcol(curwin, &oap->start, &cs, NULL, &ce);
+			    if (ce != cs && oap->start.coladd > 0)
+			    {
+				// Part of a tab selected -- but don't
+				// double-count it.
+				bd.startspaces = (ce - cs + 1)
+							  - oap->start.coladd;
+				if (bd.startspaces < 0)
+				    bd.startspaces = 0;
+				startcol++;
+			    }
+			}
+		    }
+
+		    if (lnum == oap->end.lnum)
+		    {
+			endcol = oap->end.col;
+			if (virtual_op)
+			{
+			    getvcol(curwin, &oap->end, &cs, NULL, &ce);
+			    if (p[endcol] == NUL || (cs + oap->end.coladd < ce
+					// Don't add space for double-wide
+					// char; endcol will be on last byte
+					// of multi-byte char.
+					&& (*mb_head_off)(p, p + endcol) == 0))
+			    {
+				if (oap->start.lnum == oap->end.lnum
+					    && oap->start.col == oap->end.col)
+				{
+				    // Special case: inside a single char
+				    is_oneChar = TRUE;
+				    bd.startspaces = oap->end.coladd
+					 - oap->start.coladd + oap->inclusive;
+				    endcol = startcol;
+				}
+				else
+				{
+				    bd.endspaces = oap->end.coladd
+							     + oap->inclusive;
+				    endcol -= oap->inclusive;
+				}
+			    }
+			}
+		    }
+		    if (endcol == MAXCOL)
+			endcol = (colnr_T)STRLEN(p);
+		    if (startcol > endcol || is_oneChar)
+			bd.textlen = 0;
+		    else
+			bd.textlen = endcol - startcol + oap->inclusive;
+		    bd.textstart = p + startcol;
+		    if (yank_copy_line(&bd, y_idx, FALSE) == FAIL)
+			goto fail;
+		    break;
+		}
+		// NOTREACHED
+	}
+    }
+
+    if (curr != y_current)	// append the new block to the old block
+    {
+	new_ptr = ALLOC_MULT(char_u *, curr->y_size + y_current->y_size);
+	if (new_ptr == NULL)
+	    goto fail;
+	for (j = 0; j < curr->y_size; ++j)
+	    new_ptr[j] = curr->y_array[j];
+	vim_free(curr->y_array);
+	curr->y_array = new_ptr;
+#ifdef FEAT_VIMINFO
+	curr->y_time_set = vim_time();
+#endif
+
+	if (yanktype == MLINE)	// MLINE overrides MCHAR and MBLOCK
+	    curr->y_type = MLINE;
+
+	// Concatenate the last line of the old block with the first line of
+	// the new block, unless being Vi compatible.
+	if (curr->y_type == MCHAR && vim_strchr(p_cpo, CPO_REGAPPEND) == NULL)
+	{
+	    pnew = alloc(STRLEN(curr->y_array[curr->y_size - 1])
+					  + STRLEN(y_current->y_array[0]) + 1);
+	    if (pnew == NULL)
+	    {
+		y_idx = y_current->y_size - 1;
+		goto fail;
+	    }
+	    STRCPY(pnew, curr->y_array[--j]);
+	    STRCAT(pnew, y_current->y_array[0]);
+	    vim_free(curr->y_array[j]);
+	    vim_free(y_current->y_array[0]);
+	    curr->y_array[j++] = pnew;
+	    y_idx = 1;
+	}
+	else
+	    y_idx = 0;
+	while (y_idx < y_current->y_size)
+	    curr->y_array[j++] = y_current->y_array[y_idx++];
+	curr->y_size = j;
+	vim_free(y_current->y_array);
+	y_current = curr;
+    }
+
+    if (mess)			// Display message about yank?
+    {
+	if (yanktype == MCHAR
+		&& !oap->block_mode
+		&& yanklines == 1)
+	    yanklines = 0;
+	// Some versions of Vi use ">=" here, some don't...
+	if (yanklines > p_report)
+	{
+	    char namebuf[100];
+
+	    if (oap->regname == NUL)
+		*namebuf = NUL;
+	    else
+		vim_snprintf(namebuf, sizeof(namebuf),
+						_(" into \"%c"), oap->regname);
+
+	    // redisplay now, so message is not deleted
+	    update_topline_redraw();
+	    if (oap->block_mode)
+	    {
+		smsg(NGETTEXT("block of %ld line yanked%s",
+				     "block of %ld lines yanked%s", yanklines),
+			yanklines, namebuf);
+	    }
+	    else
+	    {
+		smsg(NGETTEXT("%ld line yanked%s",
+					      "%ld lines yanked%s", yanklines),
+			yanklines, namebuf);
+	    }
+	}
+    }
+
+    if ((cmdmod.cmod_flags & CMOD_LOCKMARKS) == 0)
+    {
+	// Set "'[" and "']" marks.
+	curbuf->b_op_start = oap->start;
+	curbuf->b_op_end = oap->end;
+	if (yanktype == MLINE && !oap->block_mode)
+	{
+	    curbuf->b_op_start.col = 0;
+	    curbuf->b_op_end.col = MAXCOL;
+	}
+    }
+
+#ifdef FEAT_CLIPBOARD
+    // If we were yanking to the '*' register, send result to clipboard.
+    // If no register was specified, and "unnamed" in 'clipboard', make a copy
+    // to the '*' register.
+    if (clip_star.available
+	    && (curr == &(y_regs[STAR_REGISTER])
+		|| (!deleting && oap->regname == 0
+		   && ((clip_unnamed | clip_unnamed_saved) & CLIP_UNNAMED))))
+    {
+	if (curr != &(y_regs[STAR_REGISTER]))
+	    // Copy the text from register 0 to the clipboard register.
+	    copy_yank_reg(&(y_regs[STAR_REGISTER]));
+
+	clip_own_selection(&clip_star);
+	clip_gen_set_selection(&clip_star);
+# ifdef FEAT_X11
+	did_star = TRUE;
+# endif
+    }
+
+# ifdef FEAT_X11
+    // If we were yanking to the '+' register, send result to selection.
+    // Also copy to the '*' register, in case auto-select is off.  But not when
+    // 'clipboard' has "unnamedplus" and not "unnamed"; and not when
+    // deleting and both "unnamedplus" and "unnamed".
+    if (clip_plus.available
+	    && (curr == &(y_regs[PLUS_REGISTER])
+		|| (!deleting && oap->regname == 0
+		  && ((clip_unnamed | clip_unnamed_saved) &
+							  CLIP_UNNAMED_PLUS))))
+    {
+	if (curr != &(y_regs[PLUS_REGISTER]))
+	    // Copy the text from register 0 to the clipboard register.
+	    copy_yank_reg(&(y_regs[PLUS_REGISTER]));
+
+	clip_own_selection(&clip_plus);
+	clip_gen_set_selection(&clip_plus);
+	if (!clip_isautosel_star()
+		&& !clip_isautosel_plus()
+		&& !((clip_unnamed | clip_unnamed_saved) == CLIP_UNNAMED_PLUS)
+		&& !(deleting && (clip_unnamed | clip_unnamed_saved)
+					 == (CLIP_UNNAMED | CLIP_UNNAMED_PLUS))
+		&& !did_star
+		&& curr == &(y_regs[PLUS_REGISTER]))
+	{
+	    copy_yank_reg(&(y_regs[STAR_REGISTER]));
+	    clip_own_selection(&clip_star);
+	    clip_gen_set_selection(&clip_star);
+	}
+    }
+# endif
+#endif
+
+#if defined(FEAT_EVAL)
+    if (!deleting && has_textyankpost())
+	yank_do_autocmd(oap, y_current);
+#endif
+
+    return OK;
+
+fail:		// free the allocated lines
+    free_yank(y_idx + 1);
+    y_current = curr;
+    return FAIL;
+}
+
+/*
+ * Copy a block range into a register.
+ * If "exclude_trailing_space" is set, do not copy trailing whitespaces.
+ */
+    static int
+yank_copy_line(struct block_def *bd, long y_idx, int exclude_trailing_space)
+{
+    char_u	*pnew;
+
+    if (exclude_trailing_space)
+	bd->endspaces = 0;
+    if ((pnew = alloc(bd->startspaces + bd->endspaces + bd->textlen + 1))
+								      == NULL)
+	return FAIL;
+    y_current->y_array[y_idx] = pnew;
+    vim_memset(pnew, ' ', (size_t)bd->startspaces);
+    pnew += bd->startspaces;
+    mch_memmove(pnew, bd->textstart, (size_t)bd->textlen);
+    pnew += bd->textlen;
+    vim_memset(pnew, ' ', (size_t)bd->endspaces);
+    pnew += bd->endspaces;
+    if (exclude_trailing_space)
+    {
+	int s = bd->textlen + bd->endspaces;
+
+	while (s > 0 && VIM_ISWHITE(*(bd->textstart + s - 1)))
+	{
+	    s = s - (*mb_head_off)(bd->textstart, bd->textstart + s - 1) - 1;
+	    pnew--;
+	}
+    }
+    *pnew = NUL;
+    return OK;
+}
+
+#ifdef FEAT_CLIPBOARD
+/*
+ * Make a copy of the y_current register to register "reg".
+ */
+    static void
+copy_yank_reg(yankreg_T *reg)
+{
+    yankreg_T	*curr = y_current;
+    long	j;
+
+    y_current = reg;
+    free_yank_all();
+    *y_current = *curr;
+    y_current->y_array = lalloc_clear(
+				    sizeof(char_u *) * y_current->y_size, TRUE);
+    if (y_current->y_array == NULL)
+	y_current->y_size = 0;
+    else
+	for (j = 0; j < y_current->y_size; ++j)
+	    if ((y_current->y_array[j] = vim_strsave(curr->y_array[j])) == NULL)
+	    {
+		free_yank(j);
+		y_current->y_size = 0;
+		break;
+	    }
+    y_current = curr;
+}
+#endif
+
+/*
+ * Put contents of register "regname" into the text.
+ * Caller must check "regname" to be valid!
+ * "flags": PUT_FIXINDENT	make indent look nice
+ *	    PUT_CURSEND		leave cursor after end of new text
+ *	    PUT_LINE		force linewise put (":put")
+ *	    PUT_BLOCK_INNER     in block mode, do not add trailing spaces
+ */
+    void
+do_put(
+    int		regname,
+    char_u	*expr_result,	// result for regname "=" when compiled
+    int		dir,		// BACKWARD for 'P', FORWARD for 'p'
+    long	count,
+    int		flags)
+{
+    char_u	*ptr;
+    char_u	*newp, *oldp;
+    int		yanklen;
+    int		totlen = 0;		// init for gcc
+    linenr_T	lnum;
+    colnr_T	col;
+    long	i;			// index in y_array[]
+    int		y_type;
+    long	y_size;
+    int		oldlen;
+    long	y_width = 0;
+    colnr_T	vcol;
+    int		delcount;
+    int		incr = 0;
+    long	j;
+    struct block_def bd;
+    char_u	**y_array = NULL;
+    yankreg_T	*y_current_used = NULL;
+    long	nr_lines = 0;
+    pos_T	new_cursor;
+    int		indent;
+    int		orig_indent = 0;	// init for gcc
+    int		indent_diff = 0;	// init for gcc
+    int		first_indent = TRUE;
+    int		lendiff = 0;
+    pos_T	old_pos;
+    char_u	*insert_string = NULL;
+    int		allocated = FALSE;
+    long	cnt;
+    pos_T	orig_start = curbuf->b_op_start;
+    pos_T	orig_end = curbuf->b_op_end;
+    unsigned int cur_ve_flags = get_ve_flags();
+
+#ifdef FEAT_CLIPBOARD
+    // Adjust register name for "unnamed" in 'clipboard'.
+    adjust_clip_reg(&regname);
+    (void)may_get_selection(regname);
+#endif
+
+    if (flags & PUT_FIXINDENT)
+	orig_indent = get_indent();
+
+    curbuf->b_op_start = curwin->w_cursor;	// default for '[ mark
+    curbuf->b_op_end = curwin->w_cursor;	// default for '] mark
+
+    // Using inserted text works differently, because the register includes
+    // special characters (newlines, etc.).
+    if (regname == '.')
+    {
+	if (VIsual_active)
+	    stuffcharReadbuff(VIsual_mode);
+	(void)stuff_inserted((dir == FORWARD ? (count == -1 ? 'o' : 'a') :
+				    (count == -1 ? 'O' : 'i')), count, FALSE);
+	// Putting the text is done later, so can't really move the cursor to
+	// the next character.  Use "l" to simulate it.
+	if ((flags & PUT_CURSEND) && gchar_cursor() != NUL)
+	    stuffcharReadbuff('l');
+	return;
+    }
+
+    // For special registers '%' (file name), '#' (alternate file name) and
+    // ':' (last command line), etc. we have to create a fake yank register.
+    // For compiled code "expr_result" holds the expression result.
+    if (regname == '=' && expr_result != NULL)
+	insert_string = expr_result;
+    else if (get_spec_reg(regname, &insert_string, &allocated, TRUE)
+		&& insert_string == NULL)
+	return;
+
+    // Autocommands may be executed when saving lines for undo.  This might
+    // make "y_array" invalid, so we start undo now to avoid that.
+    if (u_save(curwin->w_cursor.lnum, curwin->w_cursor.lnum + 1) == FAIL)
+	goto end;
+
+    if (insert_string != NULL)
+    {
+	y_type = MCHAR;
+#ifdef FEAT_EVAL
+	if (regname == '=')
+	{
+	    // For the = register we need to split the string at NL
+	    // characters.
+	    // Loop twice: count the number of lines and save them.
+	    for (;;)
+	    {
+		y_size = 0;
+		ptr = insert_string;
+		while (ptr != NULL)
+		{
+		    if (y_array != NULL)
+			y_array[y_size] = ptr;
+		    ++y_size;
+		    ptr = vim_strchr(ptr, '\n');
+		    if (ptr != NULL)
+		    {
+			if (y_array != NULL)
+			    *ptr = NUL;
+			++ptr;
+			// A trailing '\n' makes the register linewise.
+			if (*ptr == NUL)
+			{
+			    y_type = MLINE;
+			    break;
+			}
+		    }
+		}
+		if (y_array != NULL)
+		    break;
+		y_array = ALLOC_MULT(char_u *, y_size);
+		if (y_array == NULL)
+		    goto end;
+	    }
+	}
+	else
+#endif
+	{
+	    y_size = 1;		// use fake one-line yank register
+	    y_array = &insert_string;
+	}
+    }
+    else
+    {
+	get_yank_register(regname, FALSE);
+
+	y_type = y_current->y_type;
+	y_width = y_current->y_width;
+	y_size = y_current->y_size;
+	y_array = y_current->y_array;
+	y_current_used = y_current;
+    }
+
+    if (y_type == MLINE)
+    {
+	if (flags & PUT_LINE_SPLIT)
+	{
+	    char_u *p;
+
+	    // "p" or "P" in Visual mode: split the lines to put the text in
+	    // between.
+	    if (u_save_cursor() == FAIL)
+		goto end;
+	    p = ml_get_cursor();
+	    if (dir == FORWARD && *p != NUL)
+		MB_PTR_ADV(p);
+	    ptr = vim_strsave(p);
+	    if (ptr == NULL)
+		goto end;
+	    ml_append(curwin->w_cursor.lnum, ptr, (colnr_T)0, FALSE);
+	    vim_free(ptr);
+
+	    oldp = ml_get_curline();
+	    p = oldp + curwin->w_cursor.col;
+	    if (dir == FORWARD && *p != NUL)
+		MB_PTR_ADV(p);
+	    ptr = vim_strnsave(oldp, p - oldp);
+	    if (ptr == NULL)
+		goto end;
+	    ml_replace(curwin->w_cursor.lnum, ptr, FALSE);
+	    ++nr_lines;
+	    dir = FORWARD;
+	}
+	if (flags & PUT_LINE_FORWARD)
+	{
+	    // Must be "p" for a Visual block, put lines below the block.
+	    curwin->w_cursor = curbuf->b_visual.vi_end;
+	    dir = FORWARD;
+	}
+	curbuf->b_op_start = curwin->w_cursor;	// default for '[ mark
+	curbuf->b_op_end = curwin->w_cursor;	// default for '] mark
+    }
+
+    if (flags & PUT_LINE)	// :put command or "p" in Visual line mode.
+	y_type = MLINE;
+
+    if (y_size == 0 || y_array == NULL)
+    {
+	semsg(_(e_nothing_in_register_str),
+		  regname == 0 ? (char_u *)"\"" : transchar(regname));
+	goto end;
+    }
+
+    if (y_type == MBLOCK)
+    {
+	lnum = curwin->w_cursor.lnum + y_size + 1;
+	if (lnum > curbuf->b_ml.ml_line_count)
+	    lnum = curbuf->b_ml.ml_line_count + 1;
+	if (u_save(curwin->w_cursor.lnum - 1, lnum) == FAIL)
+	    goto end;
+    }
+    else if (y_type == MLINE)
+    {
+	lnum = curwin->w_cursor.lnum;
+#ifdef FEAT_FOLDING
+	// Correct line number for closed fold.  Don't move the cursor yet,
+	// u_save() uses it.
+	if (dir == BACKWARD)
+	    (void)hasFolding(lnum, &lnum, NULL);
+	else
+	    (void)hasFolding(lnum, NULL, &lnum);
+#endif
+	if (dir == FORWARD)
+	    ++lnum;
+	// In an empty buffer the empty line is going to be replaced, include
+	// it in the saved lines.
+	if ((BUFEMPTY() ? u_save(0, 2) : u_save(lnum - 1, lnum)) == FAIL)
+	    goto end;
+#ifdef FEAT_FOLDING
+	if (dir == FORWARD)
+	    curwin->w_cursor.lnum = lnum - 1;
+	else
+	    curwin->w_cursor.lnum = lnum;
+	curbuf->b_op_start = curwin->w_cursor;	// for mark_adjust()
+#endif
+    }
+    else if (u_save_cursor() == FAIL)
+	goto end;
+
+    yanklen = (int)STRLEN(y_array[0]);
+
+    if (cur_ve_flags == VE_ALL && y_type == MCHAR)
+    {
+	if (gchar_cursor() == TAB)
+	{
+	    int viscol = getviscol();
+	    int ts = curbuf->b_p_ts;
+
+	    // Don't need to insert spaces when "p" on the last position of a
+	    // tab or "P" on the first position.
+	    if (dir == FORWARD ?
+#ifdef FEAT_VARTABS
+		    tabstop_padding(viscol, ts, curbuf->b_p_vts_array) != 1
+#else
+		    ts - (viscol % ts) != 1
+#endif
+		    : curwin->w_cursor.coladd > 0)
+		coladvance_force(viscol);
+	    else
+		curwin->w_cursor.coladd = 0;
+	}
+	else if (curwin->w_cursor.coladd > 0 || gchar_cursor() == NUL)
+	    coladvance_force(getviscol() + (dir == FORWARD));
+    }
+
+    lnum = curwin->w_cursor.lnum;
+    col = curwin->w_cursor.col;
+
+    // Block mode
+    if (y_type == MBLOCK)
+    {
+	int	c = gchar_cursor();
+	colnr_T	endcol2 = 0;
+
+	if (dir == FORWARD && c != NUL)
+	{
+	    if (cur_ve_flags == VE_ALL)
+		getvcol(curwin, &curwin->w_cursor, &col, NULL, &endcol2);
+	    else
+		getvcol(curwin, &curwin->w_cursor, NULL, NULL, &col);
+
+	    if (has_mbyte)
+		// move to start of next multi-byte character
+		curwin->w_cursor.col += (*mb_ptr2len)(ml_get_cursor());
+	    else
+	    if (c != TAB || cur_ve_flags != VE_ALL)
+		++curwin->w_cursor.col;
+	    ++col;
+	}
+	else
+	    getvcol(curwin, &curwin->w_cursor, &col, NULL, &endcol2);
+
+	col += curwin->w_cursor.coladd;
+	if (cur_ve_flags == VE_ALL
+		&& (curwin->w_cursor.coladd > 0
+		    || endcol2 == curwin->w_cursor.col))
+	{
+	    if (dir == FORWARD && c == NUL)
+		++col;
+	    if (dir != FORWARD && c != NUL && curwin->w_cursor.coladd > 0)
+		++curwin->w_cursor.col;
+	    if (c == TAB)
+	    {
+		if (dir == BACKWARD && curwin->w_cursor.col)
+		    curwin->w_cursor.col--;
+		if (dir == FORWARD && col - 1 == endcol2)
+		    curwin->w_cursor.col++;
+	    }
+	}
+	curwin->w_cursor.coladd = 0;
+	bd.textcol = 0;
+	for (i = 0; i < y_size; ++i)
+	{
+	    int		    spaces = 0;
+	    char	    shortline;
+	    chartabsize_T   cts;
+
+	    bd.startspaces = 0;
+	    bd.endspaces = 0;
+	    vcol = 0;
+	    delcount = 0;
+
+	    // add a new line
+	    if (curwin->w_cursor.lnum > curbuf->b_ml.ml_line_count)
+	    {
+		if (ml_append(curbuf->b_ml.ml_line_count, (char_u *)"",
+						   (colnr_T)1, FALSE) == FAIL)
+		    break;
+		++nr_lines;
+	    }
+	    // get the old line and advance to the position to insert at
+	    oldp = ml_get_curline();
+	    oldlen = (int)STRLEN(oldp);
+	    init_chartabsize_arg(&cts, curwin, curwin->w_cursor.lnum, 0,
+								  oldp, oldp);
+
+	    while (cts.cts_vcol < col && *cts.cts_ptr != NUL)
+	    {
+		// Count a tab for what it's worth (if list mode not on)
+		incr = lbr_chartabsize_adv(&cts);
+		cts.cts_vcol += incr;
+	    }
+	    vcol = cts.cts_vcol;
+	    ptr = cts.cts_ptr;
+	    bd.textcol = (colnr_T)(ptr - oldp);
+	    clear_chartabsize_arg(&cts);
+
+	    shortline = (vcol < col) || (vcol == col && !*ptr) ;
+
+	    if (vcol < col) // line too short, pad with spaces
+		bd.startspaces = col - vcol;
+	    else if (vcol > col)
+	    {
+		bd.endspaces = vcol - col;
+		bd.startspaces = incr - bd.endspaces;
+		--bd.textcol;
+		delcount = 1;
+		if (has_mbyte)
+		    bd.textcol -= (*mb_head_off)(oldp, oldp + bd.textcol);
+		if (oldp[bd.textcol] != TAB)
+		{
+		    // Only a Tab can be split into spaces.  Other
+		    // characters will have to be moved to after the
+		    // block, causing misalignment.
+		    delcount = 0;
+		    bd.endspaces = 0;
+		}
+	    }
+
+	    yanklen = (int)STRLEN(y_array[i]);
+
+	    if ((flags & PUT_BLOCK_INNER) == 0)
+	    {
+		// calculate number of spaces required to fill right side of
+		// block
+		spaces = y_width + 1;
+		init_chartabsize_arg(&cts, curwin, 0, 0,
+						      y_array[i], y_array[i]);
+		for (j = 0; j < yanklen; j++)
+		{
+		    spaces -= lbr_chartabsize(&cts);
+		    ++cts.cts_ptr;
+		    cts.cts_vcol = 0;
+		}
+		clear_chartabsize_arg(&cts);
+		if (spaces < 0)
+		    spaces = 0;
+	    }
+
+	    // Insert the new text.
+	    // First check for multiplication overflow.
+	    if (yanklen + spaces != 0
+		     && count > ((INT_MAX - (bd.startspaces + bd.endspaces))
+							/ (yanklen + spaces)))
+	    {
+		emsg(_(e_resulting_text_too_long));
+		break;
+	    }
+
+	    totlen = count * (yanklen + spaces) + bd.startspaces + bd.endspaces;
+	    newp = alloc(totlen + oldlen + 1);
+	    if (newp == NULL)
+		break;
+
+	    // copy part up to cursor to new line
+	    ptr = newp;
+	    mch_memmove(ptr, oldp, (size_t)bd.textcol);
+	    ptr += bd.textcol;
+
+	    // may insert some spaces before the new text
+	    vim_memset(ptr, ' ', (size_t)bd.startspaces);
+	    ptr += bd.startspaces;
+
+	    // insert the new text
+	    for (j = 0; j < count; ++j)
+	    {
+		mch_memmove(ptr, y_array[i], (size_t)yanklen);
+		ptr += yanklen;
+
+		// insert block's trailing spaces only if there's text behind
+		if ((j < count - 1 || !shortline) && spaces > 0)
+		{
+		    vim_memset(ptr, ' ', (size_t)spaces);
+		    ptr += spaces;
+		}
+		else
+		    totlen -= spaces;  // didn't use these spaces
+	    }
+
+	    // may insert some spaces after the new text
+	    vim_memset(ptr, ' ', (size_t)bd.endspaces);
+	    ptr += bd.endspaces;
+
+	    // move the text after the cursor to the end of the line.
+	    mch_memmove(ptr, oldp + bd.textcol + delcount,
+				(size_t)(oldlen - bd.textcol - delcount + 1));
+	    ml_replace(curwin->w_cursor.lnum, newp, FALSE);
+
+	    ++curwin->w_cursor.lnum;
+	    if (i == 0)
+		curwin->w_cursor.col += bd.startspaces;
+	}
+
+	changed_lines(lnum, 0, curwin->w_cursor.lnum, nr_lines);
+
+	// Set '[ mark.
+	curbuf->b_op_start = curwin->w_cursor;
+	curbuf->b_op_start.lnum = lnum;
+
+	// adjust '] mark
+	curbuf->b_op_end.lnum = curwin->w_cursor.lnum - 1;
+	curbuf->b_op_end.col = bd.textcol + totlen - 1;
+	if (curbuf->b_op_end.col < 0)
+	    curbuf->b_op_end.col = 0;
+	curbuf->b_op_end.coladd = 0;
+	if (flags & PUT_CURSEND)
+	{
+	    colnr_T len;
+
+	    curwin->w_cursor = curbuf->b_op_end;
+	    curwin->w_cursor.col++;
+
+	    // in Insert mode we might be after the NUL, correct for that
+	    len = (colnr_T)STRLEN(ml_get_curline());
+	    if (curwin->w_cursor.col > len)
+		curwin->w_cursor.col = len;
+	}
+	else
+	    curwin->w_cursor.lnum = lnum;
+    }
+    else
+    {
+	// Character or Line mode
+	if (y_type == MCHAR)
+	{
+	    // if type is MCHAR, FORWARD is the same as BACKWARD on the next
+	    // char
+	    if (dir == FORWARD && gchar_cursor() != NUL)
+	    {
+		if (has_mbyte)
+		{
+		    int bytelen = (*mb_ptr2len)(ml_get_cursor());
+
+		    // put it on the next of the multi-byte character.
+		    col += bytelen;
+		    if (yanklen)
+		    {
+			curwin->w_cursor.col += bytelen;
+			curbuf->b_op_end.col += bytelen;
+		    }
+		}
+		else
+		{
+		    ++col;
+		    if (yanklen)
+		    {
+			++curwin->w_cursor.col;
+			++curbuf->b_op_end.col;
+		    }
+		}
+	    }
+	    curbuf->b_op_start = curwin->w_cursor;
+	}
+	// Line mode: BACKWARD is the same as FORWARD on the previous line
+	else if (dir == BACKWARD)
+	    --lnum;
+	new_cursor = curwin->w_cursor;
+
+	// simple case: insert into one line at a time
+	if (y_type == MCHAR && y_size == 1)
+	{
+	    linenr_T	end_lnum = 0; // init for gcc
+	    linenr_T	start_lnum = lnum;
+	    int		first_byte_off = 0;
+
+	    if (VIsual_active)
+	    {
+		end_lnum = curbuf->b_visual.vi_end.lnum;
+		if (end_lnum < curbuf->b_visual.vi_start.lnum)
+		    end_lnum = curbuf->b_visual.vi_start.lnum;
+		if (end_lnum > start_lnum)
+		{
+		    pos_T   pos;
+
+		    // "col" is valid for the first line, in following lines
+		    // the virtual column needs to be used.  Matters for
+		    // multi-byte characters.
+		    pos.lnum = lnum;
+		    pos.col = col;
+		    pos.coladd = 0;
+		    getvcol(curwin, &pos, NULL, &vcol, NULL);
+		}
+	    }
+
+	    if (count == 0 || yanklen == 0)
+	    {
+		if (VIsual_active)
+		    lnum = end_lnum;
+	    }
+	    else if (count > INT_MAX / yanklen)
+		// multiplication overflow
+		emsg(_(e_resulting_text_too_long));
+	    else
+	    {
+		totlen = count * yanklen;
+		do {
+		    oldp = ml_get(lnum);
+		    oldlen = (int)STRLEN(oldp);
+		    if (lnum > start_lnum)
+		    {
+			pos_T   pos;
+
+			pos.lnum = lnum;
+			if (getvpos(&pos, vcol) == OK)
+			    col = pos.col;
+			else
+			    col = MAXCOL;
+		    }
+		    if (VIsual_active && col > oldlen)
+		    {
+			lnum++;
+			continue;
+		    }
+		    newp = alloc(totlen + oldlen + 1);
+		    if (newp == NULL)
+			goto end;	// alloc() gave an error message
+		    mch_memmove(newp, oldp, (size_t)col);
+		    ptr = newp + col;
+		    for (i = 0; i < count; ++i)
+		    {
+			mch_memmove(ptr, y_array[0], (size_t)yanklen);
+			ptr += yanklen;
+		    }
+		    STRMOVE(ptr, oldp + col);
+
+		    // compute the byte offset for the last character
+		    first_byte_off = mb_head_off(newp, ptr - 1);
+
+		    // Note: this may free "newp"
+		    ml_replace(lnum, newp, FALSE);
+
+		    inserted_bytes(lnum, col, totlen);
+
+		    // Place cursor on last putted char.
+		    if (lnum == curwin->w_cursor.lnum)
+		    {
+			// make sure curwin->w_virtcol is updated
+			changed_cline_bef_curs();
+			curwin->w_cursor.col += (colnr_T)(totlen - 1);
+		    }
+		    if (VIsual_active)
+			lnum++;
+		} while (VIsual_active && lnum <= end_lnum);
+
+		if (VIsual_active) // reset lnum to the last visual line
+		    lnum--;
+	    }
+
+	    // put '] at the first byte of the last character
+	    curbuf->b_op_end = curwin->w_cursor;
+	    curbuf->b_op_end.col -= first_byte_off;
+
+	    // For "CTRL-O p" in Insert mode, put cursor after last char
+	    if (totlen && (restart_edit != 0 || (flags & PUT_CURSEND)))
+		++curwin->w_cursor.col;
+	    else
+		curwin->w_cursor.col -= first_byte_off;
+	}
+	else
+	{
+	    linenr_T	new_lnum = new_cursor.lnum;
+	    size_t	len;
+
+	    // Insert at least one line.  When y_type is MCHAR, break the first
+	    // line in two.
+	    for (cnt = 1; cnt <= count; ++cnt)
+	    {
+		i = 0;
+		if (y_type == MCHAR)
+		{
+		    // Split the current line in two at the insert position.
+		    // First insert y_array[size - 1] in front of second line.
+		    // Then append y_array[0] to first line.
+		    lnum = new_cursor.lnum;
+		    ptr = ml_get(lnum) + col;
+		    totlen = (int)STRLEN(y_array[y_size - 1]);
+		    newp = alloc(STRLEN(ptr) + totlen + 1);
+		    if (newp == NULL)
+			goto error;
+		    STRCPY(newp, y_array[y_size - 1]);
+		    STRCAT(newp, ptr);
+		    // insert second line
+		    ml_append(lnum, newp, (colnr_T)0, FALSE);
+		    ++new_lnum;
+		    vim_free(newp);
+
+		    oldp = ml_get(lnum);
+		    newp = alloc(col + yanklen + 1);
+		    if (newp == NULL)
+			goto error;
+					    // copy first part of line
+		    mch_memmove(newp, oldp, (size_t)col);
+					    // append to first line
+		    mch_memmove(newp + col, y_array[0], (size_t)(yanklen + 1));
+		    ml_replace(lnum, newp, FALSE);
+
+		    curwin->w_cursor.lnum = lnum;
+		    i = 1;
+		}
+
+		for (; i < y_size; ++i)
+		{
+		    if (y_type != MCHAR || i < y_size - 1)
+		    {
+			if (ml_append(lnum, y_array[i], (colnr_T)0, FALSE)
+								      == FAIL)
+			    goto error;
+			new_lnum++;
+		    }
+		    lnum++;
+		    ++nr_lines;
+		    if (flags & PUT_FIXINDENT)
+		    {
+			old_pos = curwin->w_cursor;
+			curwin->w_cursor.lnum = lnum;
+			ptr = ml_get(lnum);
+			if (cnt == count && i == y_size - 1)
+			    lendiff = (int)STRLEN(ptr);
+			if (*ptr == '#' && preprocs_left())
+			    indent = 0;     // Leave # lines at start
+			else
+			     if (*ptr == NUL)
+			    indent = 0;     // Ignore empty lines
+			else if (first_indent)
+			{
+			    indent_diff = orig_indent - get_indent();
+			    indent = orig_indent;
+			    first_indent = FALSE;
+			}
+			else if ((indent = get_indent() + indent_diff) < 0)
+			    indent = 0;
+			(void)set_indent(indent, 0);
+			curwin->w_cursor = old_pos;
+			// remember how many chars were removed
+			if (cnt == count && i == y_size - 1)
+			    lendiff -= (int)STRLEN(ml_get(lnum));
+		    }
+		}
+		if (cnt == 1)
+		    new_lnum = lnum;
+	    }
+
+error:
+	    // Adjust marks.
+	    if (y_type == MLINE)
+	    {
+		curbuf->b_op_start.col = 0;
+		if (dir == FORWARD)
+		    curbuf->b_op_start.lnum++;
+	    }
+	    mark_adjust(curbuf->b_op_start.lnum + (y_type == MCHAR),
+					     (linenr_T)MAXLNUM, nr_lines, 0L);
+
+	    // note changed text for displaying and folding
+	    if (y_type == MCHAR)
+		changed_lines(curwin->w_cursor.lnum, col,
+					 curwin->w_cursor.lnum + 1, nr_lines);
+	    else
+		changed_lines(curbuf->b_op_start.lnum, 0,
+					   curbuf->b_op_start.lnum, nr_lines);
+	    if (y_current_used != NULL && (y_current_used != y_current
+					     || y_current->y_array != y_array))
+	    {
+		// Something invoked through changed_lines() has changed the
+		// yank buffer, e.g. a GUI clipboard callback.
+		emsg(_(e_yank_register_changed_while_using_it));
+		goto end;
+	    }
+
+	    // Put the '] mark on the first byte of the last inserted character.
+	    // Correct the length for change in indent.
+	    curbuf->b_op_end.lnum = new_lnum;
+	    len = STRLEN(y_array[y_size - 1]);
+	    col = (colnr_T)len - lendiff;
+	    if (col > 1)
+	    {
+		curbuf->b_op_end.col = col - 1;
+		if (len > 0)
+		    curbuf->b_op_end.col -= mb_head_off(y_array[y_size - 1],
+						y_array[y_size - 1] + len - 1);
+	    }
+	    else
+		curbuf->b_op_end.col = 0;
+
+	    if (flags & PUT_CURSLINE)
+	    {
+		// ":put": put cursor on last inserted line
+		curwin->w_cursor.lnum = lnum;
+		beginline(BL_WHITE | BL_FIX);
+	    }
+	    else if (flags & PUT_CURSEND)
+	    {
+		// put cursor after inserted text
+		if (y_type == MLINE)
+		{
+		    if (lnum >= curbuf->b_ml.ml_line_count)
+			curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count;
+		    else
+			curwin->w_cursor.lnum = lnum + 1;
+		    curwin->w_cursor.col = 0;
+		}
+		else
+		{
+		    curwin->w_cursor.lnum = new_lnum;
+		    curwin->w_cursor.col = col;
+		    curbuf->b_op_end = curwin->w_cursor;
+		    if (col > 1)
+			curbuf->b_op_end.col = col - 1;
+		}
+	    }
+	    else if (y_type == MLINE)
+	    {
+		// put cursor on first non-blank in first inserted line
+		curwin->w_cursor.col = 0;
+		if (dir == FORWARD)
+		    ++curwin->w_cursor.lnum;
+		beginline(BL_WHITE | BL_FIX);
+	    }
+	    else	// put cursor on first inserted character
+		curwin->w_cursor = new_cursor;
+	}
+    }
+
+    msgmore(nr_lines);
+    curwin->w_set_curswant = TRUE;
+
+    // Make sure the cursor is not after the NUL.
+    int len = (int)STRLEN(ml_get_curline());
+    if (curwin->w_cursor.col > len)
+    {
+	if (cur_ve_flags == VE_ALL)
+	    curwin->w_cursor.coladd = curwin->w_cursor.col - len;
+	curwin->w_cursor.col = len;
+    }
+
+end:
+    if (cmdmod.cmod_flags & CMOD_LOCKMARKS)
+    {
+	curbuf->b_op_start = orig_start;
+	curbuf->b_op_end = orig_end;
+    }
+    if (allocated)
+	vim_free(insert_string);
+    if (regname == '=')
+	vim_free(y_array);
+
+    VIsual_active = FALSE;
+
+    // If the cursor is past the end of the line put it at the end.
+    adjust_cursor_eol();
+}
+
+/*
+ * Return the character name of the register with the given number.
+ */
+    int
+get_register_name(int num)
+{
+    if (num == -1)
+	return '"';
+    else if (num < 10)
+	return num + '0';
+    else if (num == DELETION_REGISTER)
+	return '-';
+#ifdef FEAT_CLIPBOARD
+    else if (num == STAR_REGISTER)
+	return '*';
+    else if (num == PLUS_REGISTER)
+	return '+';
+#endif
+    else
+	return num + 'a' - 10;
+}
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * Return the index of the register "" points to.
+ */
+    int
+get_unname_register(void)
+{
+    return y_previous == NULL ? -1 : y_previous - &y_regs[0];
+}
+#endif
+
+/*
+ * ":dis" and ":registers": Display the contents of the yank registers.
+ */
+    void
+ex_display(exarg_T *eap)
+{
+    int		i, n;
+    long	j;
+    char_u	*p;
+    yankreg_T	*yb;
+    int		name;
+    int		attr;
+    char_u	*arg = eap->arg;
+    int		clen;
+    int		type;
+
+    if (arg != NULL && *arg == NUL)
+	arg = NULL;
+    attr = HL_ATTR(HLF_8);
+
+    // Highlight title
+    msg_puts_title(_("\nType Name Content"));
+    for (i = -1; i < NUM_REGISTERS && !got_int; ++i)
+    {
+	name = get_register_name(i);
+	switch (get_reg_type(name, NULL))
+	{
+	    case MLINE: type = 'l'; break;
+	    case MCHAR: type = 'c'; break;
+	    default:	type = 'b'; break;
+	}
+	if (arg != NULL && vim_strchr(arg, name) == NULL
+#ifdef ONE_CLIPBOARD
+	    // Star register and plus register contain the same thing.
+		&& (name != '*' || vim_strchr(arg, '+') == NULL)
+#endif
+		)
+	    continue;	    // did not ask for this register
+
+#ifdef FEAT_CLIPBOARD
+	// Adjust register name for "unnamed" in 'clipboard'.
+	// When it's a clipboard register, fill it with the current contents
+	// of the clipboard.
+	adjust_clip_reg(&name);
+	(void)may_get_selection(name);
+#endif
+
+	if (i == -1)
+	{
+	    if (y_previous != NULL)
+		yb = y_previous;
+	    else
+		yb = &(y_regs[0]);
+	}
+	else
+	    yb = &(y_regs[i]);
+
+#ifdef FEAT_EVAL
+	if (name == MB_TOLOWER(redir_reg)
+		|| (redir_reg == '"' && yb == y_previous))
+	    continue;	    // do not list register being written to, the
+			    // pointer can be freed
+#endif
+
+	if (yb->y_array != NULL)
+	{
+	    int do_show = FALSE;
+
+	    for (j = 0; !do_show && j < yb->y_size; ++j)
+		do_show = !message_filtered(yb->y_array[j]);
+
+	    if (do_show || yb->y_size == 0)
+	    {
+		msg_putchar('\n');
+		msg_puts("  ");
+		msg_putchar(type);
+		msg_puts("  ");
+		msg_putchar('"');
+		msg_putchar(name);
+		msg_puts("   ");
+
+		n = (int)Columns - 11;
+		for (j = 0; j < yb->y_size && n > 1; ++j)
+		{
+		    if (j)
+		    {
+			msg_puts_attr("^J", attr);
+			n -= 2;
+		    }
+		    for (p = yb->y_array[j];
+				    *p != NUL && (n -= ptr2cells(p)) >= 0; ++p)
+		    {
+			clen = (*mb_ptr2len)(p);
+			msg_outtrans_len(p, clen);
+			p += clen - 1;
+		    }
+		}
+		if (n > 1 && yb->y_type == MLINE)
+		    msg_puts_attr("^J", attr);
+		out_flush();		    // show one line at a time
+	    }
+	    ui_breakcheck();
+	}
+    }
+
+    // display last inserted text
+    if ((p = get_last_insert()) != NULL
+		  && (arg == NULL || vim_strchr(arg, '.') != NULL) && !got_int
+						      && !message_filtered(p))
+    {
+	msg_puts("\n  c  \".   ");
+	dis_msg(p, TRUE);
+    }
+
+    // display last command line
+    if (last_cmdline != NULL && (arg == NULL || vim_strchr(arg, ':') != NULL)
+			       && !got_int && !message_filtered(last_cmdline))
+    {
+	msg_puts("\n  c  \":   ");
+	dis_msg(last_cmdline, FALSE);
+    }
+
+    // display current file name
+    if (curbuf->b_fname != NULL
+	    && (arg == NULL || vim_strchr(arg, '%') != NULL) && !got_int
+					&& !message_filtered(curbuf->b_fname))
+    {
+	msg_puts("\n  c  \"%   ");
+	dis_msg(curbuf->b_fname, FALSE);
+    }
+
+    // display alternate file name
+    if ((arg == NULL || vim_strchr(arg, '%') != NULL) && !got_int)
+    {
+	char_u	    *fname;
+	linenr_T    dummy;
+
+	if (buflist_name_nr(0, &fname, &dummy) != FAIL
+						  && !message_filtered(fname))
+	{
+	    msg_puts("\n  c  \"#   ");
+	    dis_msg(fname, FALSE);
+	}
+    }
+
+    // display last search pattern
+    if (last_search_pat() != NULL
+		 && (arg == NULL || vim_strchr(arg, '/') != NULL) && !got_int
+				      && !message_filtered(last_search_pat()))
+    {
+	msg_puts("\n  c  \"/   ");
+	dis_msg(last_search_pat(), FALSE);
+    }
+
+#ifdef FEAT_EVAL
+    // display last used expression
+    if (expr_line != NULL && (arg == NULL || vim_strchr(arg, '=') != NULL)
+				  && !got_int && !message_filtered(expr_line))
+    {
+	msg_puts("\n  c  \"=   ");
+	dis_msg(expr_line, FALSE);
+    }
+#endif
+}
+
+/*
+ * display a string for do_dis()
+ * truncate at end of screen line
+ */
+    static void
+dis_msg(
+    char_u	*p,
+    int		skip_esc)	    // if TRUE, ignore trailing ESC
+{
+    int		n;
+    int		l;
+
+    n = (int)Columns - 6;
+    while (*p != NUL
+	    && !(*p == ESC && skip_esc && *(p + 1) == NUL)
+	    && (n -= ptr2cells(p)) >= 0)
+    {
+	if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1)
+	{
+	    msg_outtrans_len(p, l);
+	    p += l;
+	}
+	else
+	    msg_outtrans_len(p++, 1);
+    }
+    ui_breakcheck();
+}
+
+#if defined(FEAT_DND) || defined(PROTO)
+/*
+ * Replace the contents of the '~' register with str.
+ */
+    void
+dnd_yank_drag_data(char_u *str, long len)
+{
+    yankreg_T *curr;
+
+    curr = y_current;
+    y_current = &y_regs[TILDE_REGISTER];
+    free_yank_all();
+    str_to_reg(y_current, MCHAR, str, len, 0L, FALSE);
+    y_current = curr;
+}
+#endif
+
+
+/*
+ * Return the type of a register.
+ * Used for getregtype()
+ * Returns MAUTO for error.
+ */
+    char_u
+get_reg_type(int regname, long *reglen)
+{
+    switch (regname)
+    {
+	case '%':		// file name
+	case '#':		// alternate file name
+	case '=':		// expression
+	case ':':		// last command line
+	case '/':		// last search-pattern
+	case '.':		// last inserted text
+	case Ctrl_F:		// Filename under cursor
+	case Ctrl_P:		// Path under cursor, expand via "path"
+	case Ctrl_W:		// word under cursor
+	case Ctrl_A:		// WORD (mnemonic All) under cursor
+	case '_':		// black hole: always empty
+	    return MCHAR;
+    }
+
+# ifdef FEAT_CLIPBOARD
+    regname = may_get_selection(regname);
+# endif
+
+    if (regname != NUL && !valid_yank_reg(regname, FALSE))
+	return MAUTO;
+
+    get_yank_register(regname, FALSE);
+
+    if (y_current->y_array != NULL)
+    {
+	if (reglen != NULL && y_current->y_type == MBLOCK)
+	    *reglen = y_current->y_width;
+	return y_current->y_type;
+    }
+    return MAUTO;
+}
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * When "flags" has GREG_LIST return a list with text "s".
+ * Otherwise just return "s".
+ */
+    static char_u *
+getreg_wrap_one_line(char_u *s, int flags)
+{
+    if (flags & GREG_LIST)
+    {
+	list_T *list = list_alloc();
+
+	if (list != NULL)
+	{
+	    if (list_append_string(list, NULL, -1) == FAIL)
+	    {
+		list_free(list);
+		return NULL;
+	    }
+	    list->lv_first->li_tv.vval.v_string = s;
+	}
+	return (char_u *)list;
+    }
+    return s;
+}
+
+/*
+ * Return the contents of a register as a single allocated string or as a list.
+ * Used for "@r" in expressions and for getreg().
+ * Returns NULL for error.
+ * Flags:
+ *	GREG_NO_EXPR	Do not allow expression register
+ *	GREG_EXPR_SRC	For the expression register: return expression itself,
+ *			not the result of its evaluation.
+ *	GREG_LIST	Return a list of lines instead of a single string.
+ */
+    char_u *
+get_reg_contents(int regname, int flags)
+{
+    long	i;
+    char_u	*retval;
+    int		allocated;
+    long	len;
+
+    // Don't allow using an expression register inside an expression
+    if (regname == '=')
+    {
+	if (flags & GREG_NO_EXPR)
+	    return NULL;
+	if (flags & GREG_EXPR_SRC)
+	    return getreg_wrap_one_line(get_expr_line_src(), flags);
+	return getreg_wrap_one_line(get_expr_line(), flags);
+    }
+
+    if (regname == '@')	    // "@@" is used for unnamed register
+	regname = '"';
+
+    // check for valid regname
+    if (regname != NUL && !valid_yank_reg(regname, FALSE))
+	return NULL;
+
+# ifdef FEAT_CLIPBOARD
+    regname = may_get_selection(regname);
+# endif
+
+    if (get_spec_reg(regname, &retval, &allocated, FALSE))
+    {
+	if (retval == NULL)
+	    return NULL;
+	if (allocated)
+	    return getreg_wrap_one_line(retval, flags);
+	return getreg_wrap_one_line(vim_strsave(retval), flags);
+    }
+
+    get_yank_register(regname, FALSE);
+    if (y_current->y_array == NULL)
+	return NULL;
+
+    if (flags & GREG_LIST)
+    {
+	list_T	*list = list_alloc();
+	int	error = FALSE;
+
+	if (list == NULL)
+	    return NULL;
+	for (i = 0; i < y_current->y_size; ++i)
+	    if (list_append_string(list, y_current->y_array[i], -1) == FAIL)
+		error = TRUE;
+	if (error)
+	{
+	    list_free(list);
+	    return NULL;
+	}
+	return (char_u *)list;
+    }
+
+    // Compute length of resulting string.
+    len = 0;
+    for (i = 0; i < y_current->y_size; ++i)
+    {
+	len += (long)STRLEN(y_current->y_array[i]);
+	// Insert a newline between lines and after last line if
+	// y_type is MLINE.
+	if (y_current->y_type == MLINE || i < y_current->y_size - 1)
+	    ++len;
+    }
+
+    retval = alloc(len + 1);
+    if (retval == NULL)
+	return NULL;
+
+    // Copy the lines of the yank register into the string.
+    len = 0;
+    for (i = 0; i < y_current->y_size; ++i)
+    {
+	STRCPY(retval + len, y_current->y_array[i]);
+	len += (long)STRLEN(retval + len);
+
+	// Insert a NL between lines and after the last line if y_type is
+	// MLINE.
+	if (y_current->y_type == MLINE || i < y_current->y_size - 1)
+	    retval[len++] = '\n';
+    }
+    retval[len] = NUL;
+
+    return retval;
+}
+
+    static int
+init_write_reg(
+    int		name,
+    yankreg_T	**old_y_previous,
+    yankreg_T	**old_y_current,
+    int		must_append,
+    int		*yank_type UNUSED)
+{
+    if (!valid_yank_reg(name, TRUE))	    // check for valid reg name
+    {
+	emsg_invreg(name);
+	return FAIL;
+    }
+
+    // Don't want to change the current (unnamed) register
+    *old_y_previous = y_previous;
+    *old_y_current = y_current;
+
+    get_yank_register(name, TRUE);
+    if (!y_append && !must_append)
+	free_yank_all();
+    return OK;
+}
+
+    static void
+finish_write_reg(
+    int		name,
+    yankreg_T	*old_y_previous,
+    yankreg_T	*old_y_current)
+{
+# ifdef FEAT_CLIPBOARD
+    // Send text of clipboard register to the clipboard.
+    may_set_selection();
+# endif
+
+    // ':let @" = "val"' should change the meaning of the "" register
+    if (name != '"')
+	y_previous = old_y_previous;
+    y_current = old_y_current;
+}
+
+/*
+ * Store string "str" in register "name".
+ * "maxlen" is the maximum number of bytes to use, -1 for all bytes.
+ * If "must_append" is TRUE, always append to the register.  Otherwise append
+ * if "name" is an uppercase letter.
+ * Note: "maxlen" and "must_append" don't work for the "/" register.
+ * Careful: 'str' is modified, you may have to use a copy!
+ * If "str" ends in '\n' or '\r', use linewise, otherwise use characterwise.
+ */
+    void
+write_reg_contents(
+    int		name,
+    char_u	*str,
+    int		maxlen,
+    int		must_append)
+{
+    write_reg_contents_ex(name, str, maxlen, must_append, MAUTO, 0L);
+}
+
+    void
+write_reg_contents_lst(
+    int		name,
+    char_u	**strings,
+    int		maxlen UNUSED,
+    int		must_append,
+    int		yank_type,
+    long	block_len)
+{
+    yankreg_T  *old_y_previous, *old_y_current;
+
+    if (name == '/' || name == '=')
+    {
+	char_u	*s;
+
+	if (strings[0] == NULL)
+	    s = (char_u *)"";
+	else if (strings[1] != NULL)
+	{
+	    emsg(_(e_search_pattern_and_expression_register_may_not_contain_two_or_more_lines));
+	    return;
+	}
+	else
+	    s = strings[0];
+	write_reg_contents_ex(name, s, -1, must_append, yank_type, block_len);
+	return;
+    }
+
+    if (name == '_')	    // black hole: nothing to do
+	return;
+
+    if (init_write_reg(name, &old_y_previous, &old_y_current, must_append,
+		&yank_type) == FAIL)
+	return;
+
+    str_to_reg(y_current, yank_type, (char_u *)strings, -1, block_len, TRUE);
+
+    finish_write_reg(name, old_y_previous, old_y_current);
+}
+
+    void
+write_reg_contents_ex(
+    int		name,
+    char_u	*str,
+    int		maxlen,
+    int		must_append,
+    int		yank_type,
+    long	block_len)
+{
+    yankreg_T	*old_y_previous, *old_y_current;
+    long	len;
+
+    if (maxlen >= 0)
+	len = maxlen;
+    else
+	len = (long)STRLEN(str);
+
+    // Special case: '/' search pattern
+    if (name == '/')
+    {
+	set_last_search_pat(str, RE_SEARCH, TRUE, TRUE);
+	return;
+    }
+
+    if (name == '#')
+    {
+	buf_T	*buf;
+
+	if (VIM_ISDIGIT(*str))
+	{
+	    int	num = atoi((char *)str);
+
+	    buf = buflist_findnr(num);
+	    if (buf == NULL)
+		semsg(_(e_buffer_nr_does_not_exist), (long)num);
+	}
+	else
+	    buf = buflist_findnr(buflist_findpat(str, str + STRLEN(str),
+							 TRUE, FALSE, FALSE));
+	if (buf == NULL)
+	    return;
+	curwin->w_alt_fnum = buf->b_fnum;
+	return;
+    }
+
+    if (name == '=')
+    {
+	char_u	    *p, *s;
+
+	p = vim_strnsave(str, len);
+	if (p == NULL)
+	    return;
+	if (must_append && expr_line != NULL)
+	{
+	    s = concat_str(expr_line, p);
+	    vim_free(p);
+	    p = s;
+	}
+	set_expr_line(p, NULL);
+	return;
+    }
+
+    if (name == '_')	    // black hole: nothing to do
+	return;
+
+    if (init_write_reg(name, &old_y_previous, &old_y_current, must_append,
+		&yank_type) == FAIL)
+	return;
+
+    str_to_reg(y_current, yank_type, str, len, block_len, FALSE);
+
+    finish_write_reg(name, old_y_previous, old_y_current);
+}
+#endif	// FEAT_EVAL
+
+#if defined(FEAT_CLIPBOARD) || defined(FEAT_EVAL)
+/*
+ * Put a string into a register.  When the register is not empty, the string
+ * is appended.
+ */
+    void
+str_to_reg(
+    yankreg_T	*y_ptr,		// pointer to yank register
+    int		yank_type,	// MCHAR, MLINE, MBLOCK, MAUTO
+    char_u	*str,		// string to put in register
+    long	len,		// length of string
+    long	blocklen,	// width of Visual block
+    int		str_list)	// TRUE if str is char_u **
+{
+    int		type;			// MCHAR, MLINE or MBLOCK
+    int		lnum;
+    long	start;
+    long	i;
+    int		extra;
+    int		newlines;		// number of lines added
+    int		extraline = 0;		// extra line at the end
+    int		append = FALSE;		// append to last line in register
+    char_u	*s;
+    char_u	**ss;
+    char_u	**pp;
+    long	maxlen;
+
+    if (y_ptr->y_array == NULL)		// NULL means empty register
+	y_ptr->y_size = 0;
+
+    if (yank_type == MAUTO)
+	type = ((str_list || (len > 0 && (str[len - 1] == NL
+					    || str[len - 1] == CAR)))
+							     ? MLINE : MCHAR);
+    else
+	type = yank_type;
+
+    // Count the number of lines within the string
+    newlines = 0;
+    if (str_list)
+    {
+	for (ss = (char_u **) str; *ss != NULL; ++ss)
+	    ++newlines;
+    }
+    else
+    {
+	for (i = 0; i < len; i++)
+	    if (str[i] == '\n')
+		++newlines;
+	if (type == MCHAR || len == 0 || str[len - 1] != '\n')
+	{
+	    extraline = 1;
+	    ++newlines;	// count extra newline at the end
+	}
+	if (y_ptr->y_size > 0 && y_ptr->y_type == MCHAR)
+	{
+	    append = TRUE;
+	    --newlines;	// uncount newline when appending first line
+	}
+    }
+
+    // Without any lines make the register empty.
+    if (y_ptr->y_size + newlines == 0)
+    {
+	VIM_CLEAR(y_ptr->y_array);
+	return;
+    }
+
+    // Allocate an array to hold the pointers to the new register lines.
+    // If the register was not empty, move the existing lines to the new array.
+    pp = lalloc_clear((y_ptr->y_size + newlines) * sizeof(char_u *), TRUE);
+    if (pp == NULL)	// out of memory
+	return;
+    for (lnum = 0; lnum < y_ptr->y_size; ++lnum)
+	pp[lnum] = y_ptr->y_array[lnum];
+    vim_free(y_ptr->y_array);
+    y_ptr->y_array = pp;
+    maxlen = 0;
+
+    // Find the end of each line and save it into the array.
+    if (str_list)
+    {
+	for (ss = (char_u **) str; *ss != NULL; ++ss, ++lnum)
+	{
+	    pp[lnum] = vim_strsave(*ss);
+	    if (type == MBLOCK)
+	    {
+		int charlen = mb_string2cells(*ss, -1);
+
+		if (charlen > maxlen)
+		    maxlen = charlen;
+	    }
+	}
+    }
+    else
+    {
+	for (start = 0; start < len + extraline; start += i + 1)
+	{
+	    int charlen = 0;
+
+	    for (i = start; i < len; ++i)	// find the end of the line
+	    {
+		if (str[i] == '\n')
+		    break;
+		if (type == MBLOCK)
+		    charlen += mb_ptr2cells_len(str + i, len - i);
+	    }
+	    i -= start;			// i is now length of line
+	    if (charlen > maxlen)
+		maxlen = charlen;
+	    if (append)
+	    {
+		--lnum;
+		extra = (int)STRLEN(y_ptr->y_array[lnum]);
+	    }
+	    else
+		extra = 0;
+	    s = alloc(i + extra + 1);
+	    if (s == NULL)
+		break;
+	    if (extra)
+		mch_memmove(s, y_ptr->y_array[lnum], (size_t)extra);
+	    if (append)
+		vim_free(y_ptr->y_array[lnum]);
+	    if (i > 0)
+		mch_memmove(s + extra, str + start, (size_t)i);
+	    extra += i;
+	    s[extra] = NUL;
+	    y_ptr->y_array[lnum++] = s;
+	    while (--extra >= 0)
+	    {
+		if (*s == NUL)
+		    *s = '\n';	    // replace NUL with newline
+		++s;
+	    }
+	    append = FALSE;		    // only first line is appended
+	}
+    }
+    y_ptr->y_type = type;
+    y_ptr->y_size = lnum;
+    if (type == MBLOCK)
+	y_ptr->y_width = (blocklen < 0 ? maxlen - 1 : blocklen);
+    else
+	y_ptr->y_width = 0;
+# ifdef FEAT_VIMINFO
+    y_ptr->y_time_set = vim_time();
+# endif
+}
+#endif // FEAT_CLIPBOARD || FEAT_EVAL || PROTO