199 lines
6.3 KiB
C
199 lines
6.3 KiB
C
/* Determine the number of screen columns needed for a string.
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Copyright (C) 2000-2013 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 3 of the License, or
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(at your option) 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, see <http://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <haible@clisp.cons.org>. */
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#include <config.h>
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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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#include <wchar.h>
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/* Get iswcntrl(). */
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#include <wctype.h>
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/* Get INT_MAX. */
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#include <limits.h>
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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 analogue of the wcswidth function. */
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int
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mbswidth (const char *string, 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 (const char *string, size_t nbytes, 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 (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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case '\0':
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if (flags & MBSW_STOP_AT_NUL)
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return width;
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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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{
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if (w > INT_MAX - width)
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goto overflow;
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width += w;
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}
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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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{
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if (!iswcntrl (wc))
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{
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if (width == INT_MAX)
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goto overflow;
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width++;
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}
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}
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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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while (p < plimit)
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{
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unsigned char c = (unsigned char) *p++;
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if (c == 0 && (flags & MBSW_STOP_AT_NUL))
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return width;
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if (isprint (c))
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{
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if (width == INT_MAX)
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goto overflow;
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width++;
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}
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else if (!(flags & MBSW_REJECT_UNPRINTABLE))
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{
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if (!iscntrl (c))
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{
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if (width == INT_MAX)
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goto overflow;
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width++;
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}
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}
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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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overflow:
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return INT_MAX;
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}
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