1 /* Determine the number of screen columns needed for a string.
2 Copyright (C) 2000-2002 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Bruno Haible <haible@clisp.cons.org>. */
24 #ifdef HANDLE_MULTIBYTE /* for abook */
37 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */
42 /* Get iswprint(), iswcntrl(). */
46 #if !defined iswprint && !HAVE_ISWPRINT
47 # define iswprint(wc) 1
49 #if !defined iswcntrl && !HAVE_ISWCNTRL
50 # define iswcntrl(wc) 0
55 # define mbsinit(ps) 1
59 #ifndef HAVE_DECL_WCWIDTH
60 "this configure-time declaration test was not run"
62 #if !HAVE_DECL_WCWIDTH
68 /* wcwidth doesn't exist, so assume all printable characters have
70 # define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
75 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
76 # define IN_CTYPE_DOMAIN(c) 1
78 # define IN_CTYPE_DOMAIN(c) isascii(c)
80 /* Undefine to protect against the definition in wctype.h of solaris2.6. */
82 #define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
84 #define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
86 /* Returns the number of columns needed to represent the multibyte
87 character string pointed to by STRING. If a non-printable character
88 occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.
89 With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is
90 the multibyte analogon of the wcswidth function. */
92 mbswidth (const char *string, int flags)
94 return mbsnwidth (string, strlen (string), flags);
97 /* Returns the number of columns needed to represent the multibyte
98 character string pointed to by STRING of length NBYTES. If a
99 non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is
100 specified, -1 is returned. */
102 mbsnwidth (const char *string, size_t nbytes, int flags)
104 const char *p = string;
105 const char *plimit = p + nbytes;
115 case ' ': case '!': case '"': case '#': case '%':
116 case '&': case '\'': case '(': case ')': case '*':
117 case '+': case ',': case '-': case '.': case '/':
118 case '0': case '1': case '2': case '3': case '4':
119 case '5': case '6': case '7': case '8': case '9':
120 case ':': case ';': case '<': case '=': case '>':
122 case 'A': case 'B': case 'C': case 'D': case 'E':
123 case 'F': case 'G': case 'H': case 'I': case 'J':
124 case 'K': case 'L': case 'M': case 'N': case 'O':
125 case 'P': case 'Q': case 'R': case 'S': case 'T':
126 case 'U': case 'V': case 'W': case 'X': case 'Y':
128 case '[': case '\\': case ']': case '^': case '_':
129 case 'a': case 'b': case 'c': case 'd': case 'e':
130 case 'f': case 'g': case 'h': case 'i': case 'j':
131 case 'k': case 'l': case 'm': case 'n': case 'o':
132 case 'p': case 'q': case 'r': case 's': case 't':
133 case 'u': case 'v': case 'w': case 'x': case 'y':
134 case 'z': case '{': case '|': case '}': case '~':
135 /* These characters are printable ASCII characters. */
140 /* If we have a multibyte sequence, scan it up to its end. */
143 memset (&mbstate, 0, sizeof mbstate);
150 bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
152 if (bytes == (size_t) -1)
153 /* An invalid multibyte sequence was encountered. */
155 if (!(flags & MBSW_REJECT_INVALID))
165 if (bytes == (size_t) -2)
166 /* An incomplete multibyte character at the end. */
168 if (!(flags & MBSW_REJECT_INVALID))
179 /* A null wide character was encountered. */
184 /* A printable multibyte character. */
187 /* An unprintable multibyte character. */
188 if (!(flags & MBSW_REJECT_UNPRINTABLE))
189 width += (iswcntrl (wc) ? 0 : 1);
195 while (! mbsinit (&mbstate));
205 unsigned char c = (unsigned char) *p++;
209 else if (!(flags & MBSW_REJECT_UNPRINTABLE))
210 width += (ISCNTRL (c) ? 0 : 1);
218 mbsnbytes (const char *string, size_t nbytes, int maxwidth, int flags)
220 const char *p = string, *old_p = string;
221 const char *plimit = p + nbytes;
228 while (p < plimit && width < maxwidth)
233 case ' ': case '!': case '"': case '#': case '%':
234 case '&': case '\'': case '(': case ')': case '*':
235 case '+': case ',': case '-': case '.': case '/':
236 case '0': case '1': case '2': case '3': case '4':
237 case '5': case '6': case '7': case '8': case '9':
238 case ':': case ';': case '<': case '=': case '>':
240 case 'A': case 'B': case 'C': case 'D': case 'E':
241 case 'F': case 'G': case 'H': case 'I': case 'J':
242 case 'K': case 'L': case 'M': case 'N': case 'O':
243 case 'P': case 'Q': case 'R': case 'S': case 'T':
244 case 'U': case 'V': case 'W': case 'X': case 'Y':
246 case '[': case '\\': case ']': case '^': case '_':
247 case 'a': case 'b': case 'c': case 'd': case 'e':
248 case 'f': case 'g': case 'h': case 'i': case 'j':
249 case 'k': case 'l': case 'm': case 'n': case 'o':
250 case 'p': case 'q': case 'r': case 's': case 't':
251 case 'u': case 'v': case 'w': case 'x': case 'y':
252 case 'z': case '{': case '|': case '}': case '~':
253 /* These characters are printable ASCII characters. */
258 /* If we have a multibyte sequence, scan it up to its end. */
261 memset (&mbstate, 0, sizeof mbstate);
268 bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
270 if (bytes == (size_t) -1)
271 /* An invalid multibyte sequence was encountered. */
273 if (!(flags & MBSW_REJECT_INVALID))
283 if (bytes == (size_t) -2)
284 /* An incomplete multibyte character at the end. */
286 if (!(flags & MBSW_REJECT_INVALID))
297 /* A null wide character was encountered. */
302 /* A printable multibyte character. */
305 /* An unprintable multibyte character. */
306 if (!(flags & MBSW_REJECT_UNPRINTABLE))
307 width += (iswcntrl (wc) ? 0 : 1);
313 while (! mbsinit (&mbstate));
319 return (width > maxwidth) ? (old_p - string) : (p - string);
326 #endif /* HANDLE_MULTIBYTE */