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New files, from GNU gettext and GNU coreutils.
This commit is contained in:
Paul Eggert
218
lib/mbswidth.c
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218
lib/mbswidth.c
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/* Determine the number of screen columns needed for a string.
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Copyright (C) 2000-2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by Bruno Haible <haible@clisp.cons.org>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Specification. */
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#include "mbswidth.h"
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/* Get MB_CUR_MAX. */
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#include <stdlib.h>
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#include <string.h>
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/* Get isprint(). */
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#include <ctype.h>
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/* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */
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#if HAVE_WCHAR_H
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# include <wchar.h>
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#endif
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/* Get iswprint(), iswcntrl(). */
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#if HAVE_WCTYPE_H
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# include <wctype.h>
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#endif
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#if !defined iswprint && !HAVE_ISWPRINT
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# define iswprint(wc) 1
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#endif
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#if !defined iswcntrl && !HAVE_ISWCNTRL
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# define iswcntrl(wc) 0
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#endif
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#ifndef mbsinit
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# if !HAVE_MBSINIT
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# define mbsinit(ps) 1
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# endif
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#endif
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#ifndef HAVE_DECL_WCWIDTH
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"this configure-time declaration test was not run"
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#endif
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#if !HAVE_DECL_WCWIDTH
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int wcwidth ();
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#endif
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#ifndef wcwidth
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# if !HAVE_WCWIDTH
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/* wcwidth doesn't exist, so assume all printable characters have
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width 1. */
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# define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
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# endif
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#endif
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/* Get ISPRINT. */
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#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
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# define IN_CTYPE_DOMAIN(c) 1
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#else
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# define IN_CTYPE_DOMAIN(c) isascii(c)
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#endif
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/* Undefine to protect against the definition in wctype.h of solaris2.6. */
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#undef ISPRINT
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#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
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#undef ISCNTRL
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#define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
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/* Returns the number of columns needed to represent the multibyte
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character string pointed to by STRING. If a non-printable character
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occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.
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With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is
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the multibyte analogon of the wcswidth function. */
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int
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mbswidth (string, flags)
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const char *string;
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int flags;
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{
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return mbsnwidth (string, strlen (string), flags);
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}
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/* Returns the number of columns needed to represent the multibyte
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character string pointed to by STRING of length NBYTES. If a
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non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is
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specified, -1 is returned. */
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int
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mbsnwidth (string, nbytes, flags)
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const char *string;
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size_t nbytes;
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int flags;
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{
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const char *p = string;
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const char *plimit = p + nbytes;
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int width;
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width = 0;
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#if HAVE_MBRTOWC
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if (MB_CUR_MAX > 1)
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{
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while (p < plimit)
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switch (*p)
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{
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case ' ': case '!': case '"': case '#': case '%':
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case '&': case '\'': case '(': case ')': case '*':
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case '+': case ',': case '-': case '.': case '/':
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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case ':': case ';': case '<': case '=': case '>':
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case '?':
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case 'A': case 'B': case 'C': case 'D': case 'E':
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case 'F': case 'G': case 'H': case 'I': case 'J':
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case 'K': case 'L': case 'M': case 'N': case 'O':
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case 'P': case 'Q': case 'R': case 'S': case 'T':
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case 'U': case 'V': case 'W': case 'X': case 'Y':
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case 'Z':
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case '[': case '\\': case ']': case '^': case '_':
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case 'a': case 'b': case 'c': case 'd': case 'e':
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case 'f': case 'g': case 'h': case 'i': case 'j':
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case 'k': case 'l': case 'm': case 'n': case 'o':
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case 'p': case 'q': case 'r': case 's': case 't':
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case 'u': case 'v': case 'w': case 'x': case 'y':
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case 'z': case '{': case '|': case '}': case '~':
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/* These characters are printable ASCII characters. */
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p++;
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width++;
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break;
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default:
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/* If we have a multibyte sequence, scan it up to its end. */
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{
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mbstate_t mbstate;
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memset (&mbstate, 0, sizeof mbstate);
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do
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{
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wchar_t wc;
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size_t bytes;
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int w;
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bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
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if (bytes == (size_t) -1)
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/* An invalid multibyte sequence was encountered. */
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{
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if (!(flags & MBSW_REJECT_INVALID))
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{
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p++;
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width++;
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break;
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}
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else
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return -1;
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}
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if (bytes == (size_t) -2)
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/* An incomplete multibyte character at the end. */
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{
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if (!(flags & MBSW_REJECT_INVALID))
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{
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p = plimit;
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width++;
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break;
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}
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else
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return -1;
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}
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if (bytes == 0)
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/* A null wide character was encountered. */
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bytes = 1;
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w = wcwidth (wc);
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if (w >= 0)
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/* A printable multibyte character. */
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width += w;
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else
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/* An unprintable multibyte character. */
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if (!(flags & MBSW_REJECT_UNPRINTABLE))
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width += (iswcntrl (wc) ? 0 : 1);
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else
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return -1;
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p += bytes;
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}
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while (! mbsinit (&mbstate));
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}
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break;
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}
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return width;
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}
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#endif
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while (p < plimit)
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{
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unsigned char c = (unsigned char) *p++;
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if (ISPRINT (c))
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width++;
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else if (!(flags & MBSW_REJECT_UNPRINTABLE))
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width += (ISCNTRL (c) ? 0 : 1);
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else
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return -1;
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}
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return width;
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}
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45
lib/mbswidth.h
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45
lib/mbswidth.h
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@@ -0,0 +1,45 @@
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/* Determine the number of screen columns needed for a string.
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Copyright (C) 2000-2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stddef.h>
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#ifndef PARAMS
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# if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES
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# define PARAMS(Args) Args
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# else
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# define PARAMS(Args) ()
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# endif
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#endif
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/* Optional flags to influence mbswidth/mbsnwidth behavior. */
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/* If this bit is set, return -1 upon finding an invalid or incomplete
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character. Otherwise, assume invalid characters have width 1. */
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#define MBSW_REJECT_INVALID 1
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/* If this bit is set, return -1 upon finding a non-printable character.
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Otherwise, assume unprintable characters have width 0 if they are
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control characters and 1 otherwise. */
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#define MBSW_REJECT_UNPRINTABLE 2
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/* Returns the number of screen columns needed for STRING. */
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#define mbswidth gnu_mbswidth /* avoid clash with UnixWare 7.1.1 function */
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extern int mbswidth PARAMS ((const char *string, int flags));
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/* Returns the number of screen columns needed for the NBYTES bytes
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starting at BUF. */
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extern int mbsnwidth PARAMS ((const char *buf, size_t nbytes, int flags));
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36
m4/mbswidth.m4
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36
m4/mbswidth.m4
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@@ -0,0 +1,36 @@
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#serial 7
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dnl autoconf tests required for use of mbswidth.c
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dnl From Bruno Haible.
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AC_DEFUN([jm_PREREQ_MBSWIDTH],
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[
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AC_REQUIRE([AC_HEADER_STDC])
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AC_CHECK_HEADERS(limits.h stdlib.h string.h wchar.h wctype.h)
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AC_CHECK_FUNCS(isascii iswcntrl iswprint mbsinit wcwidth)
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jm_FUNC_MBRTOWC
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AC_CACHE_CHECK([whether wcwidth is declared], ac_cv_have_decl_wcwidth,
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[AC_TRY_COMPILE([
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/* AIX 3.2.5 declares wcwidth in <string.h>. */
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#if HAVE_STRING_H
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# include <string.h>
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#endif
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#if HAVE_WCHAR_H
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# include <wchar.h>
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#endif
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], [
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#ifndef wcwidth
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char *p = (char *) wcwidth;
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#endif
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], ac_cv_have_decl_wcwidth=yes, ac_cv_have_decl_wcwidth=no)])
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if test $ac_cv_have_decl_wcwidth = yes; then
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ac_val=1
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else
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ac_val=0
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fi
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AC_DEFINE_UNQUOTED(HAVE_DECL_WCWIDTH, $ac_val,
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[Define to 1 if you have the declaration of wcwidth(), and to 0 otherwise.])
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AC_TYPE_MBSTATE_T
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])
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