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>. */
20 * Adapted for abook by JH <jheinonen@users.sourceforge.net>
30 #ifdef HANDLE_MULTIBYTE /* for abook */
40 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */
45 /* Get iswprint(), iswcntrl(). */
49 #if !defined iswprint && !HAVE_ISWPRINT
50 # define iswprint(wc) 1
52 #if !defined iswcntrl && !HAVE_ISWCNTRL
53 # define iswcntrl(wc) 0
58 # define mbsinit(ps) 1
62 #ifndef HAVE_DECL_WCWIDTH
63 # warn "this configure-time declaration test was not run"
65 #if !HAVE_DECL_WCWIDTH
71 /* wcwidth doesn't exist, so assume all printable characters have
73 # define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
78 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
79 # define IN_CTYPE_DOMAIN(c) 1
81 # define IN_CTYPE_DOMAIN(c) isascii(c)
83 /* Undefine to protect against the definition in wctype.h of solaris2.6. */
85 #define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
87 #define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
89 /* Returns the number of columns needed to represent the multibyte
90 character string pointed to by STRING. If a non-printable character
91 occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.
92 With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is
93 the multibyte analogon of the wcswidth function. */
95 mbswidth (const char *string, int flags)
97 return mbsnwidth (string, strlen (string), flags);
100 /* Returns the number of columns needed to represent the multibyte
101 character string pointed to by STRING of length NBYTES. If a
102 non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is
103 specified, -1 is returned. */
105 mbsnwidth (const char *string, size_t nbytes, int flags)
107 const char *p = string;
108 const char *plimit = p + nbytes;
118 case ' ': case '!': case '"': case '#': case '%':
119 case '&': case '\'': case '(': case ')': case '*':
120 case '+': case ',': case '-': case '.': case '/':
121 case '0': case '1': case '2': case '3': case '4':
122 case '5': case '6': case '7': case '8': case '9':
123 case ':': case ';': case '<': case '=': case '>':
125 case 'A': case 'B': case 'C': case 'D': case 'E':
126 case 'F': case 'G': case 'H': case 'I': case 'J':
127 case 'K': case 'L': case 'M': case 'N': case 'O':
128 case 'P': case 'Q': case 'R': case 'S': case 'T':
129 case 'U': case 'V': case 'W': case 'X': case 'Y':
131 case '[': case '\\': case ']': case '^': case '_':
132 case 'a': case 'b': case 'c': case 'd': case 'e':
133 case 'f': case 'g': case 'h': case 'i': case 'j':
134 case 'k': case 'l': case 'm': case 'n': case 'o':
135 case 'p': case 'q': case 'r': case 's': case 't':
136 case 'u': case 'v': case 'w': case 'x': case 'y':
137 case 'z': case '{': case '|': case '}': case '~':
138 /* These characters are printable ASCII characters. */
143 /* If we have a multibyte sequence, scan it up to its end. */
146 memset (&mbstate, 0, sizeof mbstate);
153 bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
155 if (bytes == (size_t) -1)
156 /* An invalid multibyte sequence was encountered. */
158 if (!(flags & MBSW_REJECT_INVALID))
168 if (bytes == (size_t) -2)
169 /* An incomplete multibyte character at the end. */
171 if (!(flags & MBSW_REJECT_INVALID))
182 /* A null wide character was encountered. */
187 /* A printable multibyte character. */
190 /* An unprintable multibyte character. */
191 if (!(flags & MBSW_REJECT_UNPRINTABLE))
192 width += (iswcntrl (wc) ? 0 : 1);
198 while (! mbsinit (&mbstate));
208 unsigned char c = (unsigned char) *p++;
212 else if (!(flags & MBSW_REJECT_UNPRINTABLE))
213 width += (ISCNTRL (c) ? 0 : 1);
221 mbsnbytes (const char *string, size_t nbytes, int maxwidth, int flags)
223 const char *p = string, *old_p = string;
224 const char *plimit = p + nbytes;
231 while (p < plimit && width < maxwidth)
236 case ' ': case '!': case '"': case '#': case '%':
237 case '&': case '\'': case '(': case ')': case '*':
238 case '+': case ',': case '-': case '.': case '/':
239 case '0': case '1': case '2': case '3': case '4':
240 case '5': case '6': case '7': case '8': case '9':
241 case ':': case ';': case '<': case '=': case '>':
243 case 'A': case 'B': case 'C': case 'D': case 'E':
244 case 'F': case 'G': case 'H': case 'I': case 'J':
245 case 'K': case 'L': case 'M': case 'N': case 'O':
246 case 'P': case 'Q': case 'R': case 'S': case 'T':
247 case 'U': case 'V': case 'W': case 'X': case 'Y':
249 case '[': case '\\': case ']': case '^': case '_':
250 case 'a': case 'b': case 'c': case 'd': case 'e':
251 case 'f': case 'g': case 'h': case 'i': case 'j':
252 case 'k': case 'l': case 'm': case 'n': case 'o':
253 case 'p': case 'q': case 'r': case 's': case 't':
254 case 'u': case 'v': case 'w': case 'x': case 'y':
255 case 'z': case '{': case '|': case '}': case '~':
256 /* These characters are printable ASCII characters. */
261 /* If we have a multibyte sequence, scan it up to its end. */
264 memset (&mbstate, 0, sizeof mbstate);
271 bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
273 if (bytes == (size_t) -1)
274 /* An invalid multibyte sequence was encountered. */
276 if (!(flags & MBSW_REJECT_INVALID))
286 if (bytes == (size_t) -2)
287 /* An incomplete multibyte character at the end. */
289 if (!(flags & MBSW_REJECT_INVALID))
300 /* A null wide character was encountered. */
305 /* A printable multibyte character. */
308 /* An unprintable multibyte character. */
309 if (!(flags & MBSW_REJECT_UNPRINTABLE))
310 width += (iswcntrl (wc) ? 0 : 1);
316 while (! mbsinit (&mbstate));
322 return (width > maxwidth) ? (old_p - string) : (p - string);
329 #else /* HANDLE_MULTIBYTE */
333 mbswidth (const char *string, int flags)
335 return strlen(string);
337 #endif /* HANDLE_MULTIBYTE */