Adding upstream version 2:8.1.0875.upstream/2%8.1.0875upstream

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

1 files changed, 2093 insertions, 0 deletions

diff --git a/src/charset.c b/src/charset.c
new file mode 100644
index 0000000..5b091ec
--- /dev/null
+++ b/src/charset.c
@@ -0,0 +1,2093 @@
+/* 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.
+ */
+
+#include "vim.h"
+
+#if defined(HAVE_WCHAR_H)
+# include <wchar.h>	    /* for towupper() and towlower() */
+#endif
+static int win_nolbr_chartabsize(win_T *wp, char_u *s, colnr_T col, int *headp);
+
+static unsigned nr2hex(unsigned c);
+
+static int    chartab_initialized = FALSE;
+
+/* b_chartab[] is an array of 32 bytes, each bit representing one of the
+ * characters 0-255. */
+#define SET_CHARTAB(buf, c) (buf)->b_chartab[(unsigned)(c) >> 3] |= (1 << ((c) & 0x7))
+#define RESET_CHARTAB(buf, c) (buf)->b_chartab[(unsigned)(c) >> 3] &= ~(1 << ((c) & 0x7))
+#define GET_CHARTAB(buf, c) ((buf)->b_chartab[(unsigned)(c) >> 3] & (1 << ((c) & 0x7)))
+
+/* table used below, see init_chartab() for an explanation */
+static char_u	g_chartab[256];
+
+/*
+ * Flags for g_chartab[].
+ */
+#define CT_CELL_MASK	0x07	/* mask: nr of display cells (1, 2 or 4) */
+#define CT_PRINT_CHAR	0x10	/* flag: set for printable chars */
+#define CT_ID_CHAR	0x20	/* flag: set for ID chars */
+#define CT_FNAME_CHAR	0x40	/* flag: set for file name chars */
+
+/*
+ * Fill g_chartab[].  Also fills curbuf->b_chartab[] with flags for keyword
+ * characters for current buffer.
+ *
+ * Depends on the option settings 'iskeyword', 'isident', 'isfname',
+ * 'isprint' and 'encoding'.
+ *
+ * The index in g_chartab[] depends on 'encoding':
+ * - For non-multi-byte index with the byte (same as the character).
+ * - For DBCS index with the first byte.
+ * - For UTF-8 index with the character (when first byte is up to 0x80 it is
+ *   the same as the character, if the first byte is 0x80 and above it depends
+ *   on further bytes).
+ *
+ * The contents of g_chartab[]:
+ * - The lower two bits, masked by CT_CELL_MASK, give the number of display
+ *   cells the character occupies (1 or 2).  Not valid for UTF-8 above 0x80.
+ * - CT_PRINT_CHAR bit is set when the character is printable (no need to
+ *   translate the character before displaying it).  Note that only DBCS
+ *   characters can have 2 display cells and still be printable.
+ * - CT_FNAME_CHAR bit is set when the character can be in a file name.
+ * - CT_ID_CHAR bit is set when the character can be in an identifier.
+ *
+ * Return FAIL if 'iskeyword', 'isident', 'isfname' or 'isprint' option has an
+ * error, OK otherwise.
+ */
+    int
+init_chartab(void)
+{
+    return buf_init_chartab(curbuf, TRUE);
+}
+
+    int
+buf_init_chartab(
+    buf_T	*buf,
+    int		global)		/* FALSE: only set buf->b_chartab[] */
+{
+    int		c;
+    int		c2;
+    char_u	*p;
+    int		i;
+    int		tilde;
+    int		do_isalpha;
+
+    if (global)
+    {
+	/*
+	 * Set the default size for printable characters:
+	 * From <Space> to '~' is 1 (printable), others are 2 (not printable).
+	 * This also inits all 'isident' and 'isfname' flags to FALSE.
+	 *
+	 * EBCDIC: all chars below ' ' are not printable, all others are
+	 * printable.
+	 */
+	c = 0;
+	while (c < ' ')
+	    g_chartab[c++] = (dy_flags & DY_UHEX) ? 4 : 2;
+#ifdef EBCDIC
+	while (c < 255)
+#else
+	while (c <= '~')
+#endif
+	    g_chartab[c++] = 1 + CT_PRINT_CHAR;
+#ifdef FEAT_FKMAP
+	if (p_altkeymap)
+	{
+	    while (c < YE)
+		g_chartab[c++] = 1 + CT_PRINT_CHAR;
+	}
+#endif
+	while (c < 256)
+	{
+	    /* UTF-8: bytes 0xa0 - 0xff are printable (latin1) */
+	    if (enc_utf8 && c >= 0xa0)
+		g_chartab[c++] = CT_PRINT_CHAR + 1;
+	    /* euc-jp characters starting with 0x8e are single width */
+	    else if (enc_dbcs == DBCS_JPNU && c == 0x8e)
+		g_chartab[c++] = CT_PRINT_CHAR + 1;
+	    /* other double-byte chars can be printable AND double-width */
+	    else if (enc_dbcs != 0 && MB_BYTE2LEN(c) == 2)
+		g_chartab[c++] = CT_PRINT_CHAR + 2;
+	    else
+		/* the rest is unprintable by default */
+		g_chartab[c++] = (dy_flags & DY_UHEX) ? 4 : 2;
+	}
+
+	/* Assume that every multi-byte char is a filename character. */
+	for (c = 1; c < 256; ++c)
+	    if ((enc_dbcs != 0 && MB_BYTE2LEN(c) > 1)
+		    || (enc_dbcs == DBCS_JPNU && c == 0x8e)
+		    || (enc_utf8 && c >= 0xa0))
+		g_chartab[c] |= CT_FNAME_CHAR;
+    }
+
+    /*
+     * Init word char flags all to FALSE
+     */
+    vim_memset(buf->b_chartab, 0, (size_t)32);
+    if (enc_dbcs != 0)
+	for (c = 0; c < 256; ++c)
+	{
+	    /* double-byte characters are probably word characters */
+	    if (MB_BYTE2LEN(c) == 2)
+		SET_CHARTAB(buf, c);
+	}
+
+#ifdef FEAT_LISP
+    /*
+     * In lisp mode the '-' character is included in keywords.
+     */
+    if (buf->b_p_lisp)
+	SET_CHARTAB(buf, '-');
+#endif
+
+    /* Walk through the 'isident', 'iskeyword', 'isfname' and 'isprint'
+     * options Each option is a list of characters, character numbers or
+     * ranges, separated by commas, e.g.: "200-210,x,#-178,-"
+     */
+    for (i = global ? 0 : 3; i <= 3; ++i)
+    {
+	if (i == 0)
+	    p = p_isi;		/* first round: 'isident' */
+	else if (i == 1)
+	    p = p_isp;		/* second round: 'isprint' */
+	else if (i == 2)
+	    p = p_isf;		/* third round: 'isfname' */
+	else	/* i == 3 */
+	    p = buf->b_p_isk;	/* fourth round: 'iskeyword' */
+
+	while (*p)
+	{
+	    tilde = FALSE;
+	    do_isalpha = FALSE;
+	    if (*p == '^' && p[1] != NUL)
+	    {
+		tilde = TRUE;
+		++p;
+	    }
+	    if (VIM_ISDIGIT(*p))
+		c = getdigits(&p);
+	    else
+		 if (has_mbyte)
+		c = mb_ptr2char_adv(&p);
+	    else
+		c = *p++;
+	    c2 = -1;
+	    if (*p == '-' && p[1] != NUL)
+	    {
+		++p;
+		if (VIM_ISDIGIT(*p))
+		    c2 = getdigits(&p);
+		else
+		     if (has_mbyte)
+		    c2 = mb_ptr2char_adv(&p);
+		else
+		    c2 = *p++;
+	    }
+	    if (c <= 0 || c >= 256 || (c2 < c && c2 != -1) || c2 >= 256
+						 || !(*p == NUL || *p == ','))
+		return FAIL;
+
+	    if (c2 == -1)	/* not a range */
+	    {
+		/*
+		 * A single '@' (not "@-@"):
+		 * Decide on letters being ID/printable/keyword chars with
+		 * standard function isalpha(). This takes care of locale for
+		 * single-byte characters).
+		 */
+		if (c == '@')
+		{
+		    do_isalpha = TRUE;
+		    c = 1;
+		    c2 = 255;
+		}
+		else
+		    c2 = c;
+	    }
+	    while (c <= c2)
+	    {
+		/* Use the MB_ functions here, because isalpha() doesn't
+		 * work properly when 'encoding' is "latin1" and the locale is
+		 * "C".  */
+		if (!do_isalpha || MB_ISLOWER(c) || MB_ISUPPER(c)
+#ifdef FEAT_FKMAP
+			|| (p_altkeymap && (F_isalpha(c) || F_isdigit(c)))
+#endif
+			    )
+		{
+		    if (i == 0)			/* (re)set ID flag */
+		    {
+			if (tilde)
+			    g_chartab[c] &= ~CT_ID_CHAR;
+			else
+			    g_chartab[c] |= CT_ID_CHAR;
+		    }
+		    else if (i == 1)		/* (re)set printable */
+		    {
+			if ((c < ' '
+#ifndef EBCDIC
+				    || c > '~'
+#endif
+#ifdef FEAT_FKMAP
+				    || (p_altkeymap
+					&& (F_isalpha(c) || F_isdigit(c)))
+#endif
+				// For double-byte we keep the cell width, so
+				// that we can detect it from the first byte.
+			    ) && !(enc_dbcs && MB_BYTE2LEN(c) == 2))
+			{
+			    if (tilde)
+			    {
+				g_chartab[c] = (g_chartab[c] & ~CT_CELL_MASK)
+					     + ((dy_flags & DY_UHEX) ? 4 : 2);
+				g_chartab[c] &= ~CT_PRINT_CHAR;
+			    }
+			    else
+			    {
+				g_chartab[c] = (g_chartab[c] & ~CT_CELL_MASK) + 1;
+				g_chartab[c] |= CT_PRINT_CHAR;
+			    }
+			}
+		    }
+		    else if (i == 2)		/* (re)set fname flag */
+		    {
+			if (tilde)
+			    g_chartab[c] &= ~CT_FNAME_CHAR;
+			else
+			    g_chartab[c] |= CT_FNAME_CHAR;
+		    }
+		    else /* i == 3 */		/* (re)set keyword flag */
+		    {
+			if (tilde)
+			    RESET_CHARTAB(buf, c);
+			else
+			    SET_CHARTAB(buf, c);
+		    }
+		}
+		++c;
+	    }
+
+	    c = *p;
+	    p = skip_to_option_part(p);
+	    if (c == ',' && *p == NUL)
+		/* Trailing comma is not allowed. */
+		return FAIL;
+	}
+    }
+    chartab_initialized = TRUE;
+    return OK;
+}
+
+/*
+ * Translate any special characters in buf[bufsize] in-place.
+ * The result is a string with only printable characters, but if there is not
+ * enough room, not all characters will be translated.
+ */
+    void
+trans_characters(
+    char_u	*buf,
+    int		bufsize)
+{
+    int		len;		/* length of string needing translation */
+    int		room;		/* room in buffer after string */
+    char_u	*trs;		/* translated character */
+    int		trs_len;	/* length of trs[] */
+
+    len = (int)STRLEN(buf);
+    room = bufsize - len;
+    while (*buf != 0)
+    {
+	/* Assume a multi-byte character doesn't need translation. */
+	if (has_mbyte && (trs_len = (*mb_ptr2len)(buf)) > 1)
+	    len -= trs_len;
+	else
+	{
+	    trs = transchar_byte(*buf);
+	    trs_len = (int)STRLEN(trs);
+	    if (trs_len > 1)
+	    {
+		room -= trs_len - 1;
+		if (room <= 0)
+		    return;
+		mch_memmove(buf + trs_len, buf + 1, (size_t)len);
+	    }
+	    mch_memmove(buf, trs, (size_t)trs_len);
+	    --len;
+	}
+	buf += trs_len;
+    }
+}
+
+#if defined(FEAT_EVAL) || defined(FEAT_TITLE) || defined(FEAT_INS_EXPAND) \
+	|| defined(PROTO)
+/*
+ * Translate a string into allocated memory, replacing special chars with
+ * printable chars.  Returns NULL when out of memory.
+ */
+    char_u *
+transstr(char_u *s)
+{
+    char_u	*res;
+    char_u	*p;
+    int		l, len, c;
+    char_u	hexbuf[11];
+
+    if (has_mbyte)
+    {
+	/* Compute the length of the result, taking account of unprintable
+	 * multi-byte characters. */
+	len = 0;
+	p = s;
+	while (*p != NUL)
+	{
+	    if ((l = (*mb_ptr2len)(p)) > 1)
+	    {
+		c = (*mb_ptr2char)(p);
+		p += l;
+		if (vim_isprintc(c))
+		    len += l;
+		else
+		{
+		    transchar_hex(hexbuf, c);
+		    len += (int)STRLEN(hexbuf);
+		}
+	    }
+	    else
+	    {
+		l = byte2cells(*p++);
+		if (l > 0)
+		    len += l;
+		else
+		    len += 4;	/* illegal byte sequence */
+	    }
+	}
+	res = alloc((unsigned)(len + 1));
+    }
+    else
+	res = alloc((unsigned)(vim_strsize(s) + 1));
+    if (res != NULL)
+    {
+	*res = NUL;
+	p = s;
+	while (*p != NUL)
+	{
+	    if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1)
+	    {
+		c = (*mb_ptr2char)(p);
+		if (vim_isprintc(c))
+		    STRNCAT(res, p, l);	/* append printable multi-byte char */
+		else
+		    transchar_hex(res + STRLEN(res), c);
+		p += l;
+	    }
+	    else
+		STRCAT(res, transchar_byte(*p++));
+	}
+    }
+    return res;
+}
+#endif
+
+#if defined(FEAT_SYN_HL) || defined(FEAT_INS_EXPAND) || defined(PROTO)
+/*
+ * Convert the string "str[orglen]" to do ignore-case comparing.  Uses the
+ * current locale.
+ * When "buf" is NULL returns an allocated string (NULL for out-of-memory).
+ * Otherwise puts the result in "buf[buflen]".
+ */
+    char_u *
+str_foldcase(
+    char_u	*str,
+    int		orglen,
+    char_u	*buf,
+    int		buflen)
+{
+    garray_T	ga;
+    int		i;
+    int		len = orglen;
+
+#define GA_CHAR(i)  ((char_u *)ga.ga_data)[i]
+#define GA_PTR(i)   ((char_u *)ga.ga_data + i)
+#define STR_CHAR(i)  (buf == NULL ? GA_CHAR(i) : buf[i])
+#define STR_PTR(i)   (buf == NULL ? GA_PTR(i) : buf + i)
+
+    /* Copy "str" into "buf" or allocated memory, unmodified. */
+    if (buf == NULL)
+    {
+	ga_init2(&ga, 1, 10);
+	if (ga_grow(&ga, len + 1) == FAIL)
+	    return NULL;
+	mch_memmove(ga.ga_data, str, (size_t)len);
+	ga.ga_len = len;
+    }
+    else
+    {
+	if (len >= buflen)	    /* Ugly! */
+	    len = buflen - 1;
+	mch_memmove(buf, str, (size_t)len);
+    }
+    if (buf == NULL)
+	GA_CHAR(len) = NUL;
+    else
+	buf[len] = NUL;
+
+    /* Make each character lower case. */
+    i = 0;
+    while (STR_CHAR(i) != NUL)
+    {
+	if (enc_utf8 || (has_mbyte && MB_BYTE2LEN(STR_CHAR(i)) > 1))
+	{
+	    if (enc_utf8)
+	    {
+		int	c = utf_ptr2char(STR_PTR(i));
+		int	olen = utf_ptr2len(STR_PTR(i));
+		int	lc = utf_tolower(c);
+
+		/* Only replace the character when it is not an invalid
+		 * sequence (ASCII character or more than one byte) and
+		 * utf_tolower() doesn't return the original character. */
+		if ((c < 0x80 || olen > 1) && c != lc)
+		{
+		    int	    nlen = utf_char2len(lc);
+
+		    /* If the byte length changes need to shift the following
+		     * characters forward or backward. */
+		    if (olen != nlen)
+		    {
+			if (nlen > olen)
+			{
+			    if (buf == NULL
+				    ? ga_grow(&ga, nlen - olen + 1) == FAIL
+				    : len + nlen - olen >= buflen)
+			    {
+				/* out of memory, keep old char */
+				lc = c;
+				nlen = olen;
+			    }
+			}
+			if (olen != nlen)
+			{
+			    if (buf == NULL)
+			    {
+				STRMOVE(GA_PTR(i) + nlen, GA_PTR(i) + olen);
+				ga.ga_len += nlen - olen;
+			    }
+			    else
+			    {
+				STRMOVE(buf + i + nlen, buf + i + olen);
+				len += nlen - olen;
+			    }
+			}
+		    }
+		    (void)utf_char2bytes(lc, STR_PTR(i));
+		}
+	    }
+	    /* skip to next multi-byte char */
+	    i += (*mb_ptr2len)(STR_PTR(i));
+	}
+	else
+	{
+	    if (buf == NULL)
+		GA_CHAR(i) = TOLOWER_LOC(GA_CHAR(i));
+	    else
+		buf[i] = TOLOWER_LOC(buf[i]);
+	    ++i;
+	}
+    }
+
+    if (buf == NULL)
+	return (char_u *)ga.ga_data;
+    return buf;
+}
+#endif
+
+/*
+ * Catch 22: g_chartab[] can't be initialized before the options are
+ * initialized, and initializing options may cause transchar() to be called!
+ * When chartab_initialized == FALSE don't use g_chartab[].
+ * Does NOT work for multi-byte characters, c must be <= 255.
+ * Also doesn't work for the first byte of a multi-byte, "c" must be a
+ * character!
+ */
+static char_u	transchar_buf[7];
+
+    char_u *
+transchar(int c)
+{
+    int			i;
+
+    i = 0;
+    if (IS_SPECIAL(c))	    /* special key code, display as ~@ char */
+    {
+	transchar_buf[0] = '~';
+	transchar_buf[1] = '@';
+	i = 2;
+	c = K_SECOND(c);
+    }
+
+    if ((!chartab_initialized && (
+#ifdef EBCDIC
+		    (c >= 64 && c < 255)
+#else
+		    (c >= ' ' && c <= '~')
+#endif
+#ifdef FEAT_FKMAP
+			|| (p_altkeymap && F_ischar(c))
+#endif
+		)) || (c < 256 && vim_isprintc_strict(c)))
+    {
+	/* printable character */
+	transchar_buf[i] = c;
+	transchar_buf[i + 1] = NUL;
+    }
+    else
+	transchar_nonprint(transchar_buf + i, c);
+    return transchar_buf;
+}
+
+/*
+ * Like transchar(), but called with a byte instead of a character.  Checks
+ * for an illegal UTF-8 byte.
+ */
+    char_u *
+transchar_byte(int c)
+{
+    if (enc_utf8 && c >= 0x80)
+    {
+	transchar_nonprint(transchar_buf, c);
+	return transchar_buf;
+    }
+    return transchar(c);
+}
+
+/*
+ * Convert non-printable character to two or more printable characters in
+ * "buf[]".  "buf" needs to be able to hold five bytes.
+ * Does NOT work for multi-byte characters, c must be <= 255.
+ */
+    void
+transchar_nonprint(char_u *buf, int c)
+{
+    if (c == NL)
+	c = NUL;		/* we use newline in place of a NUL */
+    else if (c == CAR && get_fileformat(curbuf) == EOL_MAC)
+	c = NL;			/* we use CR in place of  NL in this case */
+
+    if (dy_flags & DY_UHEX)		/* 'display' has "uhex" */
+	transchar_hex(buf, c);
+
+#ifdef EBCDIC
+    /* For EBCDIC only the characters 0-63 and 255 are not printable */
+    else if (CtrlChar(c) != 0 || c == DEL)
+#else
+    else if (c <= 0x7f)				/* 0x00 - 0x1f and 0x7f */
+#endif
+    {
+	buf[0] = '^';
+#ifdef EBCDIC
+	if (c == DEL)
+	    buf[1] = '?';		/* DEL displayed as ^? */
+	else
+	    buf[1] = CtrlChar(c);
+#else
+	buf[1] = c ^ 0x40;		/* DEL displayed as ^? */
+#endif
+
+	buf[2] = NUL;
+    }
+    else if (enc_utf8 && c >= 0x80)
+    {
+	transchar_hex(buf, c);
+    }
+#ifndef EBCDIC
+    else if (c >= ' ' + 0x80 && c <= '~' + 0x80)    /* 0xa0 - 0xfe */
+    {
+	buf[0] = '|';
+	buf[1] = c - 0x80;
+	buf[2] = NUL;
+    }
+#else
+    else if (c < 64)
+    {
+	buf[0] = '~';
+	buf[1] = MetaChar(c);
+	buf[2] = NUL;
+    }
+#endif
+    else					    /* 0x80 - 0x9f and 0xff */
+    {
+	/*
+	 * TODO: EBCDIC I don't know what to do with this chars, so I display
+	 * them as '~?' for now
+	 */
+	buf[0] = '~';
+#ifdef EBCDIC
+	buf[1] = '?';			/* 0xff displayed as ~? */
+#else
+	buf[1] = (c - 0x80) ^ 0x40;	/* 0xff displayed as ~? */
+#endif
+	buf[2] = NUL;
+    }
+}
+
+    void
+transchar_hex(char_u *buf, int c)
+{
+    int		i = 0;
+
+    buf[0] = '<';
+    if (c > 255)
+    {
+	buf[++i] = nr2hex((unsigned)c >> 12);
+	buf[++i] = nr2hex((unsigned)c >> 8);
+    }
+    buf[++i] = nr2hex((unsigned)c >> 4);
+    buf[++i] = nr2hex((unsigned)c);
+    buf[++i] = '>';
+    buf[++i] = NUL;
+}
+
+/*
+ * Convert the lower 4 bits of byte "c" to its hex character.
+ * Lower case letters are used to avoid the confusion of <F1> being 0xf1 or
+ * function key 1.
+ */
+    static unsigned
+nr2hex(unsigned c)
+{
+    if ((c & 0xf) <= 9)
+	return (c & 0xf) + '0';
+    return (c & 0xf) - 10 + 'a';
+}
+
+/*
+ * Return number of display cells occupied by byte "b".
+ * Caller must make sure 0 <= b <= 255.
+ * For multi-byte mode "b" must be the first byte of a character.
+ * A TAB is counted as two cells: "^I".
+ * For UTF-8 mode this will return 0 for bytes >= 0x80, because the number of
+ * cells depends on further bytes.
+ */
+    int
+byte2cells(int b)
+{
+    if (enc_utf8 && b >= 0x80)
+	return 0;
+    return (g_chartab[b] & CT_CELL_MASK);
+}
+
+/*
+ * Return number of display cells occupied by character "c".
+ * "c" can be a special key (negative number) in which case 3 or 4 is returned.
+ * A TAB is counted as two cells: "^I" or four: "<09>".
+ */
+    int
+char2cells(int c)
+{
+    if (IS_SPECIAL(c))
+	return char2cells(K_SECOND(c)) + 2;
+    if (c >= 0x80)
+    {
+	/* UTF-8: above 0x80 need to check the value */
+	if (enc_utf8)
+	    return utf_char2cells(c);
+	/* DBCS: double-byte means double-width, except for euc-jp with first
+	 * byte 0x8e */
+	if (enc_dbcs != 0 && c >= 0x100)
+	{
+	    if (enc_dbcs == DBCS_JPNU && ((unsigned)c >> 8) == 0x8e)
+		return 1;
+	    return 2;
+	}
+    }
+    return (g_chartab[c & 0xff] & CT_CELL_MASK);
+}
+
+/*
+ * Return number of display cells occupied by character at "*p".
+ * A TAB is counted as two cells: "^I" or four: "<09>".
+ */
+    int
+ptr2cells(char_u *p)
+{
+    /* For UTF-8 we need to look at more bytes if the first byte is >= 0x80. */
+    if (enc_utf8 && *p >= 0x80)
+	return utf_ptr2cells(p);
+    /* For DBCS we can tell the cell count from the first byte. */
+    return (g_chartab[*p] & CT_CELL_MASK);
+}
+
+/*
+ * Return the number of character cells string "s" will take on the screen,
+ * counting TABs as two characters: "^I".
+ */
+    int
+vim_strsize(char_u *s)
+{
+    return vim_strnsize(s, (int)MAXCOL);
+}
+
+/*
+ * Return the number of character cells string "s[len]" will take on the
+ * screen, counting TABs as two characters: "^I".
+ */
+    int
+vim_strnsize(char_u *s, int len)
+{
+    int		size = 0;
+
+    while (*s != NUL && --len >= 0)
+	if (has_mbyte)
+	{
+	    int	    l = (*mb_ptr2len)(s);
+
+	    size += ptr2cells(s);
+	    s += l;
+	    len -= l - 1;
+	}
+	else
+	    size += byte2cells(*s++);
+
+    return size;
+}
+
+/*
+ * Return the number of characters 'c' will take on the screen, taking
+ * into account the size of a tab.
+ * Use a define to make it fast, this is used very often!!!
+ * Also see getvcol() below.
+ */
+
+#ifdef FEAT_VARTABS
+# define RET_WIN_BUF_CHARTABSIZE(wp, buf, p, col) \
+    if (*(p) == TAB && (!(wp)->w_p_list || lcs_tab1)) \
+    { \
+	return tabstop_padding(col, (buf)->b_p_ts, (buf)->b_p_vts_array); \
+    } \
+    else \
+	return ptr2cells(p);
+#else
+# define RET_WIN_BUF_CHARTABSIZE(wp, buf, p, col) \
+    if (*(p) == TAB && (!(wp)->w_p_list || lcs_tab1)) \
+    { \
+	int ts; \
+	ts = (buf)->b_p_ts; \
+	return (int)(ts - (col % ts)); \
+    } \
+    else \
+	return ptr2cells(p);
+#endif
+
+    int
+chartabsize(char_u *p, colnr_T col)
+{
+    RET_WIN_BUF_CHARTABSIZE(curwin, curbuf, p, col)
+}
+
+#ifdef FEAT_LINEBREAK
+    static int
+win_chartabsize(win_T *wp, char_u *p, colnr_T col)
+{
+    RET_WIN_BUF_CHARTABSIZE(wp, wp->w_buffer, p, col)
+}
+#endif
+
+/*
+ * Return the number of characters the string 's' will take on the screen,
+ * taking into account the size of a tab.
+ */
+    int
+linetabsize(char_u *s)
+{
+    return linetabsize_col(0, s);
+}
+
+/*
+ * Like linetabsize(), but starting at column "startcol".
+ */
+    int
+linetabsize_col(int startcol, char_u *s)
+{
+    colnr_T	col = startcol;
+    char_u	*line = s; /* pointer to start of line, for breakindent */
+
+    while (*s != NUL)
+	col += lbr_chartabsize_adv(line, &s, col);
+    return (int)col;
+}
+
+/*
+ * Like linetabsize(), but for a given window instead of the current one.
+ */
+    int
+win_linetabsize(win_T *wp, char_u *line, colnr_T len)
+{
+    colnr_T	col = 0;
+    char_u	*s;
+
+    for (s = line; *s != NUL && (len == MAXCOL || s < line + len);
+								MB_PTR_ADV(s))
+	col += win_lbr_chartabsize(wp, line, s, col, NULL);
+    return (int)col;
+}
+
+/*
+ * Return TRUE if 'c' is a normal identifier character:
+ * Letters and characters from the 'isident' option.
+ */
+    int
+vim_isIDc(int c)
+{
+    return (c > 0 && c < 0x100 && (g_chartab[c] & CT_ID_CHAR));
+}
+
+/*
+ * return TRUE if 'c' is a keyword character: Letters and characters from
+ * 'iskeyword' option for the current buffer.
+ * For multi-byte characters mb_get_class() is used (builtin rules).
+ */
+    int
+vim_iswordc(int c)
+{
+    return vim_iswordc_buf(c, curbuf);
+}
+
+    int
+vim_iswordc_buf(int c, buf_T *buf)
+{
+    if (c >= 0x100)
+    {
+	if (enc_dbcs != 0)
+	    return dbcs_class((unsigned)c >> 8, (unsigned)(c & 0xff)) >= 2;
+	if (enc_utf8)
+	    return utf_class_buf(c, buf) >= 2;
+	return FALSE;
+    }
+    return (c > 0 && GET_CHARTAB(buf, c) != 0);
+}
+
+/*
+ * Just like vim_iswordc() but uses a pointer to the (multi-byte) character.
+ */
+    int
+vim_iswordp(char_u *p)
+{
+    return vim_iswordp_buf(p, curbuf);
+}
+
+    int
+vim_iswordp_buf(char_u *p, buf_T *buf)
+{
+    int	c = *p;
+
+    if (has_mbyte && MB_BYTE2LEN(c) > 1)
+	c = (*mb_ptr2char)(p);
+    return vim_iswordc_buf(c, buf);
+}
+
+/*
+ * return TRUE if 'c' is a valid file-name character
+ * Assume characters above 0x100 are valid (multi-byte).
+ */
+    int
+vim_isfilec(int c)
+{
+    return (c >= 0x100 || (c > 0 && (g_chartab[c] & CT_FNAME_CHAR)));
+}
+
+/*
+ * return TRUE if 'c' is a valid file-name character or a wildcard character
+ * Assume characters above 0x100 are valid (multi-byte).
+ * Explicitly interpret ']' as a wildcard character as mch_has_wildcard("]")
+ * returns false.
+ */
+    int
+vim_isfilec_or_wc(int c)
+{
+    char_u buf[2];
+
+    buf[0] = (char_u)c;
+    buf[1] = NUL;
+    return vim_isfilec(c) || c == ']' || mch_has_wildcard(buf);
+}
+
+/*
+ * Return TRUE if 'c' is a printable character.
+ * Assume characters above 0x100 are printable (multi-byte), except for
+ * Unicode.
+ */
+    int
+vim_isprintc(int c)
+{
+    if (enc_utf8 && c >= 0x100)
+	return utf_printable(c);
+    return (c >= 0x100 || (c > 0 && (g_chartab[c] & CT_PRINT_CHAR)));
+}
+
+/*
+ * Strict version of vim_isprintc(c), don't return TRUE if "c" is the head
+ * byte of a double-byte character.
+ */
+    int
+vim_isprintc_strict(int c)
+{
+    if (enc_dbcs != 0 && c < 0x100 && MB_BYTE2LEN(c) > 1)
+	return FALSE;
+    if (enc_utf8 && c >= 0x100)
+	return utf_printable(c);
+    return (c >= 0x100 || (c > 0 && (g_chartab[c] & CT_PRINT_CHAR)));
+}
+
+/*
+ * like chartabsize(), but also check for line breaks on the screen
+ */
+    int
+lbr_chartabsize(
+    char_u		*line UNUSED, /* start of the line */
+    unsigned char	*s,
+    colnr_T		col)
+{
+#ifdef FEAT_LINEBREAK
+    if (!curwin->w_p_lbr && *p_sbr == NUL && !curwin->w_p_bri)
+    {
+#endif
+	if (curwin->w_p_wrap)
+	    return win_nolbr_chartabsize(curwin, s, col, NULL);
+	RET_WIN_BUF_CHARTABSIZE(curwin, curbuf, s, col)
+#ifdef FEAT_LINEBREAK
+    }
+    return win_lbr_chartabsize(curwin, line == NULL ? s : line, s, col, NULL);
+#endif
+}
+
+/*
+ * Call lbr_chartabsize() and advance the pointer.
+ */
+    int
+lbr_chartabsize_adv(
+    char_u	*line, /* start of the line */
+    char_u	**s,
+    colnr_T	col)
+{
+    int		retval;
+
+    retval = lbr_chartabsize(line, *s, col);
+    MB_PTR_ADV(*s);
+    return retval;
+}
+
+/*
+ * This function is used very often, keep it fast!!!!
+ *
+ * If "headp" not NULL, set *headp to the size of what we for 'showbreak'
+ * string at start of line.  Warning: *headp is only set if it's a non-zero
+ * value, init to 0 before calling.
+ */
+    int
+win_lbr_chartabsize(
+    win_T	*wp,
+    char_u	*line UNUSED, /* start of the line */
+    char_u	*s,
+    colnr_T	col,
+    int		*headp UNUSED)
+{
+#ifdef FEAT_LINEBREAK
+    int		c;
+    int		size;
+    colnr_T	col2;
+    colnr_T	col_adj = 0; /* col + screen size of tab */
+    colnr_T	colmax;
+    int		added;
+    int		mb_added = 0;
+    int		numberextra;
+    char_u	*ps;
+    int		tab_corr = (*s == TAB);
+    int		n;
+
+    /*
+     * No 'linebreak', 'showbreak' and 'breakindent': return quickly.
+     */
+    if (!wp->w_p_lbr && !wp->w_p_bri && *p_sbr == NUL)
+#endif
+    {
+	if (wp->w_p_wrap)
+	    return win_nolbr_chartabsize(wp, s, col, headp);
+	RET_WIN_BUF_CHARTABSIZE(wp, wp->w_buffer, s, col)
+    }
+
+#ifdef FEAT_LINEBREAK
+    /*
+     * First get normal size, without 'linebreak'
+     */
+    size = win_chartabsize(wp, s, col);
+    c = *s;
+    if (tab_corr)
+	col_adj = size - 1;
+
+    /*
+     * If 'linebreak' set check at a blank before a non-blank if the line
+     * needs a break here
+     */
+    if (wp->w_p_lbr
+	    && VIM_ISBREAK(c)
+	    && !VIM_ISBREAK((int)s[1])
+	    && wp->w_p_wrap
+	    && wp->w_width != 0)
+    {
+	/*
+	 * Count all characters from first non-blank after a blank up to next
+	 * non-blank after a blank.
+	 */
+	numberextra = win_col_off(wp);
+	col2 = col;
+	colmax = (colnr_T)(wp->w_width - numberextra - col_adj);
+	if (col >= colmax)
+	{
+	    colmax += col_adj;
+	    n = colmax +  win_col_off2(wp);
+	    if (n > 0)
+		colmax += (((col - colmax) / n) + 1) * n - col_adj;
+	}
+
+	for (;;)
+	{
+	    ps = s;
+	    MB_PTR_ADV(s);
+	    c = *s;
+	    if (!(c != NUL
+		    && (VIM_ISBREAK(c)
+			|| (!VIM_ISBREAK(c)
+			    && (col2 == col || !VIM_ISBREAK((int)*ps))))))
+		break;
+
+	    col2 += win_chartabsize(wp, s, col2);
+	    if (col2 >= colmax)		/* doesn't fit */
+	    {
+		size = colmax - col + col_adj;
+		tab_corr = FALSE;
+		break;
+	    }
+	}
+    }
+    else if (has_mbyte && size == 2 && MB_BYTE2LEN(*s) > 1
+				    && wp->w_p_wrap && in_win_border(wp, col))
+    {
+	++size;		/* Count the ">" in the last column. */
+	mb_added = 1;
+    }
+
+    /*
+     * May have to add something for 'breakindent' and/or 'showbreak'
+     * string at start of line.
+     * Set *headp to the size of what we add.
+     */
+    added = 0;
+    if ((*p_sbr != NUL || wp->w_p_bri) && wp->w_p_wrap && col != 0)
+    {
+	colnr_T sbrlen = 0;
+	int	numberwidth = win_col_off(wp);
+
+	numberextra = numberwidth;
+	col += numberextra + mb_added;
+	if (col >= (colnr_T)wp->w_width)
+	{
+	    col -= wp->w_width;
+	    numberextra = wp->w_width - (numberextra - win_col_off2(wp));
+	    if (col >= numberextra && numberextra > 0)
+		col %= numberextra;
+	    if (*p_sbr != NUL)
+	    {
+		sbrlen = (colnr_T)MB_CHARLEN(p_sbr);
+		if (col >= sbrlen)
+		    col -= sbrlen;
+	    }
+	    if (col >= numberextra && numberextra > 0)
+		col = col % numberextra;
+	    else if (col > 0 && numberextra > 0)
+		col += numberwidth - win_col_off2(wp);
+
+	    numberwidth -= win_col_off2(wp);
+	}
+	if (col == 0 || col + size + sbrlen > (colnr_T)wp->w_width)
+	{
+	    added = 0;
+	    if (*p_sbr != NUL)
+	    {
+		if (size + sbrlen + numberwidth > (colnr_T)wp->w_width)
+		{
+		    /* calculate effective window width */
+		    int width = (colnr_T)wp->w_width - sbrlen - numberwidth;
+		    int prev_width = col ? ((colnr_T)wp->w_width - (sbrlen + col)) : 0;
+		    if (width == 0)
+			width = (colnr_T)wp->w_width;
+		    added += ((size - prev_width) / width) * vim_strsize(p_sbr);
+		    if ((size - prev_width) % width)
+			/* wrapped, add another length of 'sbr' */
+			added += vim_strsize(p_sbr);
+		}
+		else
+		    added += vim_strsize(p_sbr);
+	    }
+	    if (wp->w_p_bri)
+		added += get_breakindent_win(wp, line);
+
+	    size += added;
+	    if (col != 0)
+		added = 0;
+	}
+    }
+    if (headp != NULL)
+	*headp = added + mb_added;
+    return size;
+#endif
+}
+
+/*
+ * Like win_lbr_chartabsize(), except that we know 'linebreak' is off and
+ * 'wrap' is on.  This means we need to check for a double-byte character that
+ * doesn't fit at the end of the screen line.
+ */
+    static int
+win_nolbr_chartabsize(
+    win_T	*wp,
+    char_u	*s,
+    colnr_T	col,
+    int		*headp)
+{
+    int		n;
+
+    if (*s == TAB && (!wp->w_p_list || lcs_tab1))
+    {
+# ifdef FEAT_VARTABS
+	return tabstop_padding(col, wp->w_buffer->b_p_ts,
+				    wp->w_buffer->b_p_vts_array);
+# else
+	n = wp->w_buffer->b_p_ts;
+	return (int)(n - (col % n));
+# endif
+    }
+    n = ptr2cells(s);
+    /* Add one cell for a double-width character in the last column of the
+     * window, displayed with a ">". */
+    if (n == 2 && MB_BYTE2LEN(*s) > 1 && in_win_border(wp, col))
+    {
+	if (headp != NULL)
+	    *headp = 1;
+	return 3;
+    }
+    return n;
+}
+
+/*
+ * Return TRUE if virtual column "vcol" is in the rightmost column of window
+ * "wp".
+ */
+    int
+in_win_border(win_T *wp, colnr_T vcol)
+{
+    int		width1;		/* width of first line (after line number) */
+    int		width2;		/* width of further lines */
+
+    if (wp->w_width == 0)	/* there is no border */
+	return FALSE;
+    width1 = wp->w_width - win_col_off(wp);
+    if ((int)vcol < width1 - 1)
+	return FALSE;
+    if ((int)vcol == width1 - 1)
+	return TRUE;
+    width2 = width1 + win_col_off2(wp);
+    if (width2 <= 0)
+	return FALSE;
+    return ((vcol - width1) % width2 == width2 - 1);
+}
+
+/*
+ * Get virtual column number of pos.
+ *  start: on the first position of this character (TAB, ctrl)
+ * cursor: where the cursor is on this character (first char, except for TAB)
+ *    end: on the last position of this character (TAB, ctrl)
+ *
+ * This is used very often, keep it fast!
+ */
+    void
+getvcol(
+    win_T	*wp,
+    pos_T	*pos,
+    colnr_T	*start,
+    colnr_T	*cursor,
+    colnr_T	*end)
+{
+    colnr_T	vcol;
+    char_u	*ptr;		/* points to current char */
+    char_u	*posptr;	/* points to char at pos->col */
+    char_u	*line;		/* start of the line */
+    int		incr;
+    int		head;
+#ifdef FEAT_VARTABS
+    int		*vts = wp->w_buffer->b_p_vts_array;
+#endif
+    int		ts = wp->w_buffer->b_p_ts;
+    int		c;
+
+    vcol = 0;
+    line = ptr = ml_get_buf(wp->w_buffer, pos->lnum, FALSE);
+    if (pos->col == MAXCOL)
+	posptr = NULL;  /* continue until the NUL */
+    else
+    {
+	/* Special check for an empty line, which can happen on exit, when
+	 * ml_get_buf() always returns an empty string. */
+	if (*ptr == NUL)
+	    pos->col = 0;
+	posptr = ptr + pos->col;
+	if (has_mbyte)
+	    /* always start on the first byte */
+	    posptr -= (*mb_head_off)(line, posptr);
+    }
+
+    /*
+     * This function is used very often, do some speed optimizations.
+     * When 'list', 'linebreak', 'showbreak' and 'breakindent' are not set
+     * use a simple loop.
+     * Also use this when 'list' is set but tabs take their normal size.
+     */
+    if ((!wp->w_p_list || lcs_tab1 != NUL)
+#ifdef FEAT_LINEBREAK
+	    && !wp->w_p_lbr && *p_sbr == NUL && !wp->w_p_bri
+#endif
+       )
+    {
+	for (;;)
+	{
+	    head = 0;
+	    c = *ptr;
+	    /* make sure we don't go past the end of the line */
+	    if (c == NUL)
+	    {
+		incr = 1;	/* NUL at end of line only takes one column */
+		break;
+	    }
+	    /* A tab gets expanded, depending on the current column */
+	    if (c == TAB)
+#ifdef FEAT_VARTABS
+		incr = tabstop_padding(vcol, ts, vts);
+#else
+		incr = ts - (vcol % ts);
+#endif
+	    else
+	    {
+		if (has_mbyte)
+		{
+		    /* For utf-8, if the byte is >= 0x80, need to look at
+		     * further bytes to find the cell width. */
+		    if (enc_utf8 && c >= 0x80)
+			incr = utf_ptr2cells(ptr);
+		    else
+			incr = g_chartab[c] & CT_CELL_MASK;
+
+		    /* If a double-cell char doesn't fit at the end of a line
+		     * it wraps to the next line, it's like this char is three
+		     * cells wide. */
+		    if (incr == 2 && wp->w_p_wrap && MB_BYTE2LEN(*ptr) > 1
+			    && in_win_border(wp, vcol))
+		    {
+			++incr;
+			head = 1;
+		    }
+		}
+		else
+		    incr = g_chartab[c] & CT_CELL_MASK;
+	    }
+
+	    if (posptr != NULL && ptr >= posptr) /* character at pos->col */
+		break;
+
+	    vcol += incr;
+	    MB_PTR_ADV(ptr);
+	}
+    }
+    else
+    {
+	for (;;)
+	{
+	    /* A tab gets expanded, depending on the current column */
+	    head = 0;
+	    incr = win_lbr_chartabsize(wp, line, ptr, vcol, &head);
+	    /* make sure we don't go past the end of the line */
+	    if (*ptr == NUL)
+	    {
+		incr = 1;	/* NUL at end of line only takes one column */
+		break;
+	    }
+
+	    if (posptr != NULL && ptr >= posptr) /* character at pos->col */
+		break;
+
+	    vcol += incr;
+	    MB_PTR_ADV(ptr);
+	}
+    }
+    if (start != NULL)
+	*start = vcol + head;
+    if (end != NULL)
+	*end = vcol + incr - 1;
+    if (cursor != NULL)
+    {
+	if (*ptr == TAB
+		&& (State & NORMAL)
+		&& !wp->w_p_list
+		&& !virtual_active()
+		&& !(VIsual_active
+				&& (*p_sel == 'e' || LTOREQ_POS(*pos, VIsual)))
+		)
+	    *cursor = vcol + incr - 1;	    /* cursor at end */
+	else
+	    *cursor = vcol + head;	    /* cursor at start */
+    }
+}
+
+/*
+ * Get virtual cursor column in the current window, pretending 'list' is off.
+ */
+    colnr_T
+getvcol_nolist(pos_T *posp)
+{
+    int		list_save = curwin->w_p_list;
+    colnr_T	vcol;
+
+    curwin->w_p_list = FALSE;
+    if (posp->coladd)
+	getvvcol(curwin, posp, NULL, &vcol, NULL);
+    else
+	getvcol(curwin, posp, NULL, &vcol, NULL);
+    curwin->w_p_list = list_save;
+    return vcol;
+}
+
+/*
+ * Get virtual column in virtual mode.
+ */
+    void
+getvvcol(
+    win_T	*wp,
+    pos_T	*pos,
+    colnr_T	*start,
+    colnr_T	*cursor,
+    colnr_T	*end)
+{
+    colnr_T	col;
+    colnr_T	coladd;
+    colnr_T	endadd;
+    char_u	*ptr;
+
+    if (virtual_active())
+    {
+	/* For virtual mode, only want one value */
+	getvcol(wp, pos, &col, NULL, NULL);
+
+	coladd = pos->coladd;
+	endadd = 0;
+	/* Cannot put the cursor on part of a wide character. */
+	ptr = ml_get_buf(wp->w_buffer, pos->lnum, FALSE);
+	if (pos->col < (colnr_T)STRLEN(ptr))
+	{
+	    int c = (*mb_ptr2char)(ptr + pos->col);
+
+	    if (c != TAB && vim_isprintc(c))
+	    {
+		endadd = (colnr_T)(char2cells(c) - 1);
+		if (coladd > endadd)	/* past end of line */
+		    endadd = 0;
+		else
+		    coladd = 0;
+	    }
+	}
+	col += coladd;
+	if (start != NULL)
+	    *start = col;
+	if (cursor != NULL)
+	    *cursor = col;
+	if (end != NULL)
+	    *end = col + endadd;
+    }
+    else
+	getvcol(wp, pos, start, cursor, end);
+}
+
+/*
+ * Get the leftmost and rightmost virtual column of pos1 and pos2.
+ * Used for Visual block mode.
+ */
+    void
+getvcols(
+    win_T	*wp,
+    pos_T	*pos1,
+    pos_T	*pos2,
+    colnr_T	*left,
+    colnr_T	*right)
+{
+    colnr_T	from1, from2, to1, to2;
+
+    if (LT_POSP(pos1, pos2))
+    {
+	getvvcol(wp, pos1, &from1, NULL, &to1);
+	getvvcol(wp, pos2, &from2, NULL, &to2);
+    }
+    else
+    {
+	getvvcol(wp, pos2, &from1, NULL, &to1);
+	getvvcol(wp, pos1, &from2, NULL, &to2);
+    }
+    if (from2 < from1)
+	*left = from2;
+    else
+	*left = from1;
+    if (to2 > to1)
+    {
+	if (*p_sel == 'e' && from2 - 1 >= to1)
+	    *right = from2 - 1;
+	else
+	    *right = to2;
+    }
+    else
+	*right = to1;
+}
+
+/*
+ * skipwhite: skip over ' ' and '\t'.
+ */
+    char_u *
+skipwhite(char_u *q)
+{
+    char_u	*p = q;
+
+    while (VIM_ISWHITE(*p)) /* skip to next non-white */
+	++p;
+    return p;
+}
+
+/*
+ * getwhitecols: return the number of whitespace
+ * columns (bytes) at the start of a given line
+ */
+    int
+getwhitecols_curline()
+{
+    return getwhitecols(ml_get_curline());
+}
+
+    int
+getwhitecols(char_u *p)
+{
+    return skipwhite(p) - p;
+}
+
+/*
+ * skip over digits
+ */
+    char_u *
+skipdigits(char_u *q)
+{
+    char_u	*p = q;
+
+    while (VIM_ISDIGIT(*p))	/* skip to next non-digit */
+	++p;
+    return p;
+}
+
+#if defined(FEAT_SYN_HL) || defined(FEAT_SPELL) || defined(PROTO)
+/*
+ * skip over binary digits
+ */
+    char_u *
+skipbin(char_u *q)
+{
+    char_u	*p = q;
+
+    while (vim_isbdigit(*p))	/* skip to next non-digit */
+	++p;
+    return p;
+}
+
+/*
+ * skip over digits and hex characters
+ */
+    char_u *
+skiphex(char_u *q)
+{
+    char_u	*p = q;
+
+    while (vim_isxdigit(*p))	/* skip to next non-digit */
+	++p;
+    return p;
+}
+#endif
+
+/*
+ * skip to bin digit (or NUL after the string)
+ */
+    char_u *
+skiptobin(char_u *q)
+{
+    char_u	*p = q;
+
+    while (*p != NUL && !vim_isbdigit(*p))	/* skip to next digit */
+	++p;
+    return p;
+}
+
+/*
+ * skip to digit (or NUL after the string)
+ */
+    char_u *
+skiptodigit(char_u *q)
+{
+    char_u	*p = q;
+
+    while (*p != NUL && !VIM_ISDIGIT(*p))	/* skip to next digit */
+	++p;
+    return p;
+}
+
+/*
+ * skip to hex character (or NUL after the string)
+ */
+    char_u *
+skiptohex(char_u *q)
+{
+    char_u	*p = q;
+
+    while (*p != NUL && !vim_isxdigit(*p))	/* skip to next digit */
+	++p;
+    return p;
+}
+
+/*
+ * Variant of isdigit() that can handle characters > 0x100.
+ * We don't use isdigit() here, because on some systems it also considers
+ * superscript 1 to be a digit.
+ * Use the VIM_ISDIGIT() macro for simple arguments.
+ */
+    int
+vim_isdigit(int c)
+{
+    return (c >= '0' && c <= '9');
+}
+
+/*
+ * Variant of isxdigit() that can handle characters > 0x100.
+ * We don't use isxdigit() here, because on some systems it also considers
+ * superscript 1 to be a digit.
+ */
+    int
+vim_isxdigit(int c)
+{
+    return (c >= '0' && c <= '9')
+	|| (c >= 'a' && c <= 'f')
+	|| (c >= 'A' && c <= 'F');
+}
+
+/*
+ * Corollary of vim_isdigit and vim_isxdigit() that can handle
+ * characters > 0x100.
+ */
+    int
+vim_isbdigit(int c)
+{
+    return (c == '0' || c == '1');
+}
+
+/*
+ * Vim's own character class functions.  These exist because many library
+ * islower()/toupper() etc. do not work properly: they crash when used with
+ * invalid values or can't handle latin1 when the locale is C.
+ * Speed is most important here.
+ */
+#define LATIN1LOWER 'l'
+#define LATIN1UPPER 'U'
+
+static char_u latin1flags[257] = "                                                                 UUUUUUUUUUUUUUUUUUUUUUUUUU      llllllllllllllllllllllllll                                                                     UUUUUUUUUUUUUUUUUUUUUUU UUUUUUUllllllllllllllllllllllll llllllll";
+static char_u latin1upper[257] = "                                 !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`ABCDEFGHIJKLMNOPQRSTUVWXYZ{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xf7\xd8\xd9\xda\xdb\xdc\xdd\xde\xff";
+static char_u latin1lower[257] = "                                 !\"#$%&'()*+,-./0123456789:;<=>?@abcdefghijklmnopqrstuvwxyz[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xd7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff";
+
+    int
+vim_islower(int c)
+{
+    if (c <= '@')
+	return FALSE;
+    if (c >= 0x80)
+    {
+	if (enc_utf8)
+	    return utf_islower(c);
+	if (c >= 0x100)
+	{
+#ifdef HAVE_ISWLOWER
+	    if (has_mbyte)
+		return iswlower(c);
+#endif
+	    /* islower() can't handle these chars and may crash */
+	    return FALSE;
+	}
+	if (enc_latin1like)
+	    return (latin1flags[c] & LATIN1LOWER) == LATIN1LOWER;
+    }
+    return islower(c);
+}
+
+    int
+vim_isupper(int c)
+{
+    if (c <= '@')
+	return FALSE;
+    if (c >= 0x80)
+    {
+	if (enc_utf8)
+	    return utf_isupper(c);
+	if (c >= 0x100)
+	{
+#ifdef HAVE_ISWUPPER
+	    if (has_mbyte)
+		return iswupper(c);
+#endif
+	    /* islower() can't handle these chars and may crash */
+	    return FALSE;
+	}
+	if (enc_latin1like)
+	    return (latin1flags[c] & LATIN1UPPER) == LATIN1UPPER;
+    }
+    return isupper(c);
+}
+
+    int
+vim_toupper(int c)
+{
+    if (c <= '@')
+	return c;
+    if (c >= 0x80 || !(cmp_flags & CMP_KEEPASCII))
+    {
+	if (enc_utf8)
+	    return utf_toupper(c);
+	if (c >= 0x100)
+	{
+#ifdef HAVE_TOWUPPER
+	    if (has_mbyte)
+		return towupper(c);
+#endif
+	    /* toupper() can't handle these chars and may crash */
+	    return c;
+	}
+	if (enc_latin1like)
+	    return latin1upper[c];
+    }
+    if (c < 0x80 && (cmp_flags & CMP_KEEPASCII))
+	return TOUPPER_ASC(c);
+    return TOUPPER_LOC(c);
+}
+
+    int
+vim_tolower(int c)
+{
+    if (c <= '@')
+	return c;
+    if (c >= 0x80 || !(cmp_flags & CMP_KEEPASCII))
+    {
+	if (enc_utf8)
+	    return utf_tolower(c);
+	if (c >= 0x100)
+	{
+#ifdef HAVE_TOWLOWER
+	    if (has_mbyte)
+		return towlower(c);
+#endif
+	    /* tolower() can't handle these chars and may crash */
+	    return c;
+	}
+	if (enc_latin1like)
+	    return latin1lower[c];
+    }
+    if (c < 0x80 && (cmp_flags & CMP_KEEPASCII))
+	return TOLOWER_ASC(c);
+    return TOLOWER_LOC(c);
+}
+
+/*
+ * skiptowhite: skip over text until ' ' or '\t' or NUL.
+ */
+    char_u *
+skiptowhite(char_u *p)
+{
+    while (*p != ' ' && *p != '\t' && *p != NUL)
+	++p;
+    return p;
+}
+
+/*
+ * skiptowhite_esc: Like skiptowhite(), but also skip escaped chars
+ */
+    char_u *
+skiptowhite_esc(char_u *p)
+{
+    while (*p != ' ' && *p != '\t' && *p != NUL)
+    {
+	if ((*p == '\\' || *p == Ctrl_V) && *(p + 1) != NUL)
+	    ++p;
+	++p;
+    }
+    return p;
+}
+
+/*
+ * Getdigits: Get a number from a string and skip over it.
+ * Note: the argument is a pointer to a char_u pointer!
+ */
+    long
+getdigits(char_u **pp)
+{
+    char_u	*p;
+    long	retval;
+
+    p = *pp;
+    retval = atol((char *)p);
+    if (*p == '-')		/* skip negative sign */
+	++p;
+    p = skipdigits(p);		/* skip to next non-digit */
+    *pp = p;
+    return retval;
+}
+
+/*
+ * Return TRUE if "lbuf" is empty or only contains blanks.
+ */
+    int
+vim_isblankline(char_u *lbuf)
+{
+    char_u	*p;
+
+    p = skipwhite(lbuf);
+    return (*p == NUL || *p == '\r' || *p == '\n');
+}
+
+/*
+ * Convert a string into a long and/or unsigned long, taking care of
+ * hexadecimal, octal, and binary numbers.  Accepts a '-' sign.
+ * If "prep" is not NULL, returns a flag to indicate the type of the number:
+ *  0	    decimal
+ *  '0'	    octal
+ *  'B'	    bin
+ *  'b'	    bin
+ *  'X'	    hex
+ *  'x'	    hex
+ * If "len" is not NULL, the length of the number in characters is returned.
+ * If "nptr" is not NULL, the signed result is returned in it.
+ * If "unptr" is not NULL, the unsigned result is returned in it.
+ * If "what" contains STR2NR_BIN recognize binary numbers
+ * If "what" contains STR2NR_OCT recognize octal numbers
+ * If "what" contains STR2NR_HEX recognize hex numbers
+ * If "what" contains STR2NR_FORCE always assume bin/oct/hex.
+ * If maxlen > 0, check at a maximum maxlen chars.
+ */
+    void
+vim_str2nr(
+    char_u		*start,
+    int			*prep,	    /* return: type of number 0 = decimal, 'x'
+				       or 'X' is hex, '0' = octal, 'b' or 'B'
+				       is bin */
+    int			*len,	    /* return: detected length of number */
+    int			what,	    /* what numbers to recognize */
+    varnumber_T		*nptr,	    /* return: signed result */
+    uvarnumber_T	*unptr,	    /* return: unsigned result */
+    int			maxlen)     /* max length of string to check */
+{
+    char_u	    *ptr = start;
+    int		    pre = 0;		/* default is decimal */
+    int		    negative = FALSE;
+    uvarnumber_T    un = 0;
+    int		    n;
+
+    if (ptr[0] == '-')
+    {
+	negative = TRUE;
+	++ptr;
+    }
+
+    /* Recognize hex, octal, and bin. */
+    if (ptr[0] == '0' && ptr[1] != '8' && ptr[1] != '9'
+					       && (maxlen == 0 || maxlen > 1))
+    {
+	pre = ptr[1];
+	if ((what & STR2NR_HEX)
+		&& (pre == 'X' || pre == 'x') && vim_isxdigit(ptr[2])
+		&& (maxlen == 0 || maxlen > 2))
+	    /* hexadecimal */
+	    ptr += 2;
+	else if ((what & STR2NR_BIN)
+		&& (pre == 'B' || pre == 'b') && vim_isbdigit(ptr[2])
+		&& (maxlen == 0 || maxlen > 2))
+	    /* binary */
+	    ptr += 2;
+	else
+	{
+	    /* decimal or octal, default is decimal */
+	    pre = 0;
+	    if (what & STR2NR_OCT)
+	    {
+		/* Don't interpret "0", "08" or "0129" as octal. */
+		for (n = 1; n != maxlen && VIM_ISDIGIT(ptr[n]); ++n)
+		{
+		    if (ptr[n] > '7')
+		    {
+			pre = 0;	/* can't be octal */
+			break;
+		    }
+		    pre = '0';	/* assume octal */
+		}
+	    }
+	}
+    }
+
+    /*
+    * Do the string-to-numeric conversion "manually" to avoid sscanf quirks.
+    */
+    n = 1;
+    if (pre == 'B' || pre == 'b' || what == STR2NR_BIN + STR2NR_FORCE)
+    {
+	/* bin */
+	if (pre != 0)
+	    n += 2;	    /* skip over "0b" */
+	while ('0' <= *ptr && *ptr <= '1')
+	{
+	    /* avoid ubsan error for overflow */
+	    if (un <= UVARNUM_MAX / 2)
+		un = 2 * un + (uvarnumber_T)(*ptr - '0');
+	    else
+		un = UVARNUM_MAX;
+	    ++ptr;
+	    if (n++ == maxlen)
+		break;
+	}
+    }
+    else if (pre == '0' || what == STR2NR_OCT + STR2NR_FORCE)
+    {
+	/* octal */
+	while ('0' <= *ptr && *ptr <= '7')
+	{
+	    /* avoid ubsan error for overflow */
+	    if (un <= UVARNUM_MAX / 8)
+		un = 8 * un + (uvarnumber_T)(*ptr - '0');
+	    else
+		un = UVARNUM_MAX;
+	    ++ptr;
+	    if (n++ == maxlen)
+		break;
+	}
+    }
+    else if (pre != 0 || what == STR2NR_HEX + STR2NR_FORCE)
+    {
+	/* hex */
+	if (pre != 0)
+	    n += 2;	    /* skip over "0x" */
+	while (vim_isxdigit(*ptr))
+	{
+	    /* avoid ubsan error for overflow */
+	    if (un <= UVARNUM_MAX / 16)
+		un = 16 * un + (uvarnumber_T)hex2nr(*ptr);
+	    else
+		un = UVARNUM_MAX;
+	    ++ptr;
+	    if (n++ == maxlen)
+		break;
+	}
+    }
+    else
+    {
+	/* decimal */
+	while (VIM_ISDIGIT(*ptr))
+	{
+	    uvarnumber_T    digit = (uvarnumber_T)(*ptr - '0');
+
+	    /* avoid ubsan error for overflow */
+	    if (un < UVARNUM_MAX / 10
+		    || (un == UVARNUM_MAX / 10 && digit <= UVARNUM_MAX % 10))
+		un = 10 * un + digit;
+	    else
+		un = UVARNUM_MAX;
+	    ++ptr;
+	    if (n++ == maxlen)
+		break;
+	}
+    }
+
+    if (prep != NULL)
+	*prep = pre;
+    if (len != NULL)
+	*len = (int)(ptr - start);
+    if (nptr != NULL)
+    {
+	if (negative)   /* account for leading '-' for decimal numbers */
+	{
+	    /* avoid ubsan error for overflow */
+	    if (un > VARNUM_MAX)
+		*nptr = VARNUM_MIN;
+	    else
+		*nptr = -(varnumber_T)un;
+	}
+	else
+	{
+	    if (un > VARNUM_MAX)
+		un = VARNUM_MAX;
+	    *nptr = (varnumber_T)un;
+	}
+    }
+    if (unptr != NULL)
+	*unptr = un;
+}
+
+/*
+ * Return the value of a single hex character.
+ * Only valid when the argument is '0' - '9', 'A' - 'F' or 'a' - 'f'.
+ */
+    int
+hex2nr(int c)
+{
+    if (c >= 'a' && c <= 'f')
+	return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F')
+	return c - 'A' + 10;
+    return c - '0';
+}
+
+#if defined(FEAT_TERMRESPONSE) || defined(FEAT_GUI_GTK) || defined(PROTO)
+/*
+ * Convert two hex characters to a byte.
+ * Return -1 if one of the characters is not hex.
+ */
+    int
+hexhex2nr(char_u *p)
+{
+    if (!vim_isxdigit(p[0]) || !vim_isxdigit(p[1]))
+	return -1;
+    return (hex2nr(p[0]) << 4) + hex2nr(p[1]);
+}
+#endif
+
+/*
+ * Return TRUE if "str" starts with a backslash that should be removed.
+ * For MS-DOS, WIN32 and OS/2 this is only done when the character after the
+ * backslash is not a normal file name character.
+ * '$' is a valid file name character, we don't remove the backslash before
+ * it.  This means it is not possible to use an environment variable after a
+ * backslash.  "C:\$VIM\doc" is taken literally, only "$VIM\doc" works.
+ * Although "\ name" is valid, the backslash in "Program\ files" must be
+ * removed.  Assume a file name doesn't start with a space.
+ * For multi-byte names, never remove a backslash before a non-ascii
+ * character, assume that all multi-byte characters are valid file name
+ * characters.
+ */
+    int
+rem_backslash(char_u *str)
+{
+#ifdef BACKSLASH_IN_FILENAME
+    return (str[0] == '\\'
+	    && str[1] < 0x80
+	    && (str[1] == ' '
+		|| (str[1] != NUL
+		    && str[1] != '*'
+		    && str[1] != '?'
+		    && !vim_isfilec(str[1]))));
+#else
+    return (str[0] == '\\' && str[1] != NUL);
+#endif
+}
+
+/*
+ * Halve the number of backslashes in a file name argument.
+ * For MS-DOS we only do this if the character after the backslash
+ * is not a normal file character.
+ */
+    void
+backslash_halve(char_u *p)
+{
+    for ( ; *p; ++p)
+	if (rem_backslash(p))
+	    STRMOVE(p, p + 1);
+}
+
+/*
+ * backslash_halve() plus save the result in allocated memory.
+ */
+    char_u *
+backslash_halve_save(char_u *p)
+{
+    char_u	*res;
+
+    res = vim_strsave(p);
+    if (res == NULL)
+	return p;
+    backslash_halve(res);
+    return res;
+}
+
+#if (defined(EBCDIC) && defined(FEAT_POSTSCRIPT)) || defined(PROTO)
+/*
+ * Table for EBCDIC to ASCII conversion unashamedly taken from xxd.c!
+ * The first 64 entries have been added to map control characters defined in
+ * ascii.h
+ */
+static char_u ebcdic2ascii_tab[256] =
+{
+    0000, 0001, 0002, 0003, 0004, 0011, 0006, 0177,
+    0010, 0011, 0012, 0013, 0014, 0015, 0016, 0017,
+    0020, 0021, 0022, 0023, 0024, 0012, 0010, 0027,
+    0030, 0031, 0032, 0033, 0033, 0035, 0036, 0037,
+    0040, 0041, 0042, 0043, 0044, 0045, 0046, 0047,
+    0050, 0051, 0052, 0053, 0054, 0055, 0056, 0057,
+    0060, 0061, 0062, 0063, 0064, 0065, 0066, 0067,
+    0070, 0071, 0072, 0073, 0074, 0075, 0076, 0077,
+    0040, 0240, 0241, 0242, 0243, 0244, 0245, 0246,
+    0247, 0250, 0325, 0056, 0074, 0050, 0053, 0174,
+    0046, 0251, 0252, 0253, 0254, 0255, 0256, 0257,
+    0260, 0261, 0041, 0044, 0052, 0051, 0073, 0176,
+    0055, 0057, 0262, 0263, 0264, 0265, 0266, 0267,
+    0270, 0271, 0313, 0054, 0045, 0137, 0076, 0077,
+    0272, 0273, 0274, 0275, 0276, 0277, 0300, 0301,
+    0302, 0140, 0072, 0043, 0100, 0047, 0075, 0042,
+    0303, 0141, 0142, 0143, 0144, 0145, 0146, 0147,
+    0150, 0151, 0304, 0305, 0306, 0307, 0310, 0311,
+    0312, 0152, 0153, 0154, 0155, 0156, 0157, 0160,
+    0161, 0162, 0136, 0314, 0315, 0316, 0317, 0320,
+    0321, 0345, 0163, 0164, 0165, 0166, 0167, 0170,
+    0171, 0172, 0322, 0323, 0324, 0133, 0326, 0327,
+    0330, 0331, 0332, 0333, 0334, 0335, 0336, 0337,
+    0340, 0341, 0342, 0343, 0344, 0135, 0346, 0347,
+    0173, 0101, 0102, 0103, 0104, 0105, 0106, 0107,
+    0110, 0111, 0350, 0351, 0352, 0353, 0354, 0355,
+    0175, 0112, 0113, 0114, 0115, 0116, 0117, 0120,
+    0121, 0122, 0356, 0357, 0360, 0361, 0362, 0363,
+    0134, 0237, 0123, 0124, 0125, 0126, 0127, 0130,
+    0131, 0132, 0364, 0365, 0366, 0367, 0370, 0371,
+    0060, 0061, 0062, 0063, 0064, 0065, 0066, 0067,
+    0070, 0071, 0372, 0373, 0374, 0375, 0376, 0377
+};
+
+/*
+ * Convert a buffer worth of characters from EBCDIC to ASCII.  Only useful if
+ * wanting 7-bit ASCII characters out the other end.
+ */
+    void
+ebcdic2ascii(char_u *buffer, int len)
+{
+    int		i;
+
+    for (i = 0; i < len; i++)
+	buffer[i] = ebcdic2ascii_tab[buffer[i]];
+}
+#endif