1 /* Determine the number of screen columns needed for a string.
2 Copyright (C) 2000 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>. */
41 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */
50 #if !defined iswprint && !HAVE_ISWPRINT
51 # define iswprint(wc) 1
54 /* Some systems, like BeOS, have multibyte encodings but lack mbstate_t. */
55 #if HAVE_MBRTOWC && defined mbstate_t
56 # define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0)
57 # define mbsinit(ps) 1
60 #ifndef HAVE_DECL_WCWIDTH
61 "this configure-time declaration test was not run"
63 #if !HAVE_DECL_WCWIDTH
69 /* wcwidth doesn't exist, so assume all printable characters have
71 # define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
76 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
77 /* Undefine to protect against the definition in wctype.h of solaris2.6. */
81 # define ISASCII(c) isascii (c)
83 /* Undefine to protect against the definition in wctype.h of solaris2.6. */
85 #define ISPRINT(c) (ISASCII (c) && isprint (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, -1 is returned, unless MBSW_ACCEPT_UNPRINTABLE is specified.
92 With flags = 0, this is the multibyte analogon of the wcswidth function. */
94 mbswidth (const char *string, int flags)
96 return mbsnwidth (string, strlen (string), flags);
99 /* Returns the number of columns needed to represent the multibyte
100 character string pointed to by STRING of length NBYTES. If a
101 non-printable character occurs, -1 is returned, unless
102 MBSW_ACCEPT_UNPRINTABLE is specified. */
104 mbsnwidth (const char *string, size_t nbytes, int flags)
106 const char *p = string;
107 const char *plimit = p + nbytes;
111 #if HAVE_MBRTOWC && (MB_LEN_MAX > 1)
117 case ' ': case '!': case '"': case '#': case '%':
118 case '&': case '\'': case '(': case ')': case '*':
119 case '+': case ',': case '-': case '.': case '/':
120 case '0': case '1': case '2': case '3': case '4':
121 case '5': case '6': case '7': case '8': case '9':
122 case ':': case ';': case '<': case '=': case '>':
124 case 'A': case 'B': case 'C': case 'D': case 'E':
125 case 'F': case 'G': case 'H': case 'I': case 'J':
126 case 'K': case 'L': case 'M': case 'N': case 'O':
127 case 'P': case 'Q': case 'R': case 'S': case 'T':
128 case 'U': case 'V': case 'W': case 'X': case 'Y':
130 case '[': case '\\': case ']': case '^': case '_':
131 case 'a': case 'b': case 'c': case 'd': case 'e':
132 case 'f': case 'g': case 'h': case 'i': case 'j':
133 case 'k': case 'l': case 'm': case 'n': case 'o':
134 case 'p': case 'q': case 'r': case 's': case 't':
135 case 'u': case 'v': case 'w': case 'x': case 'y':
136 case 'z': case '{': case '|': case '}': case '~':
137 /* These characters are printable ASCII characters. */
142 /* If we have a multibyte sequence, scan it up to its end. */
145 memset (&mbstate, 0, sizeof mbstate);
152 bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
154 if (bytes == (size_t) -1)
155 /* An invalid multibyte sequence was encountered. */
157 if (flags & MBSW_ACCEPT_INVALID)
163 if (bytes == (size_t) -2)
164 /* An incomplete multibyte character at the end. */
166 if (flags & MBSW_ACCEPT_INVALID)
173 /* A null wide character was encountered. */
178 /* A printable multibyte character. */
181 /* An unprintable multibyte character. */
182 if (flags & MBSW_ACCEPT_UNPRINTABLE)
189 while (! mbsinit (&mbstate));
199 unsigned char c = (unsigned char) *p++;
201 if ((flags & MBSW_ACCEPT_UNPRINTABLE) || ISPRINT (c))