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/* Determine the number of screen columns needed for a string.
Copyright (C) 2000 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by Bruno Haible <haible@clisp.cons.org>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/* Tell GNU libc to declare wcwidth(). */
#ifndef _XOPEN_SOURCE
# define _XOPEN_SOURCE 500
#endif
/* Get MB_LEN_MAX. */
#if HAVE_LIMITS_H
# include <limits.h>
#endif
/* Get MB_CUR_MAX. */
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_STRING_H
# include <string.h>
#endif
/* Get isprint(). */
#include <ctype.h>
/* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */
#if HAVE_WCHAR_H
# include <wchar.h>
#endif
/* Get iswprint(). */
#if HAVE_WCTYPE_H
# include <wctype.h>
#endif
#if !defined iswprint && !HAVE_ISWPRINT
# define iswprint(wc) 1
#endif
/* Some systems, like BeOS, have multibyte encodings but lack mbstate_t. */
#if HAVE_MBRTOWC && defined mbstate_t
# define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0)
# define mbsinit(ps) 1
#endif
/* If wcwidth() doesn't exist, assume all printable characters have
width 1. */
#if !defined wcwidth && !HAVE_WCWIDTH
# define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
#endif
/* Get ISPRINT. */
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
/* Undefine to protect against the definition in wctype.h of solaris2.6. */
# undef ISASCII
# define ISASCII(c) 1
#else
# define ISASCII(c) isascii (c)
#endif
/* Undefine to protect against the definition in wctype.h of solaris2.6. */
#undef ISPRINT
#define ISPRINT(c) (ISASCII (c) && isprint (c))
/* Returns the number of columns needed to represent the multibyte
character string pointed to by STRING. If a non-printable character
occurs, -1 is returned.
This is the multibyte analogon of the wcswidth function. */
int
mbswidth (const char *string)
{
const char *p = string;
const char *plimit = p + strlen (p);
int width;
width = 0;
#if HAVE_MBRTOWC && (MB_LEN_MAX > 1)
if (MB_CUR_MAX > 1)
{
while (p < plimit)
switch (*p)
{
case ' ': case '!': case '"': case '#': case '%':
case '&': case '\'': case '(': case ')': case '*':
case '+': case ',': case '-': case '.': case '/':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case ':': case ';': case '<': case '=': case '>':
case '?':
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z':
case '[': case '\\': case ']': case '^': case '_':
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y':
case 'z': case '{': case '|': case '}': case '~':
/* These characters are printable ASCII characters. */
p++;
width++;
break;
case '\0':
break;
default:
/* If we have a multibyte sequence, scan it up to its end. */
{
mbstate_t mbstate;
memset (&mbstate, 0, sizeof mbstate);
do
{
wchar_t wc;
size_t bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
int w;
if (bytes == 0)
/* A null wide character was encountered. */
break;
if (bytes == (size_t) -1)
/* An invalid multibyte sequence was encountered. */
return -1;
if (bytes == (size_t) -2)
/* An incomplete multibyte character at the end. */
return -1;
w = wcwidth (wc);
if (w >= 0)
/* A printable multibyte character. */
width += w;
else
/* An unprintable multibyte character. */
return -1;
p += bytes;
}
while (! mbsinit (&mbstate));
}
break;
}
return width;
}
#endif
while (p < plimit)
{
unsigned char c = (unsigned char) *p++;
if (c == '\0')
break;
if (ISPRINT (c))
width++;
else
return -1;
}
return width;
}
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