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>. */
24 /* Tell GNU libc to declare wcwidth(). */
26 # define _XOPEN_SOURCE 500
46 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */
55 #if !defined iswprint && !HAVE_ISWPRINT
56 # define iswprint(wc) 1
59 /* Some systems, like BeOS, have multibyte encodings but lack mbstate_t. */
60 #if HAVE_MBRTOWC && defined mbstate_t
61 # define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0)
62 # define mbsinit(ps) 1
65 /* If wcwidth() doesn't exist, assume all printable characters have
67 #if !defined wcwidth && !HAVE_WCWIDTH
68 # define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
72 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
73 /* Undefine to protect against the definition in wctype.h of solaris2.6. */
77 # define ISASCII(c) isascii (c)
79 /* Undefine to protect against the definition in wctype.h of solaris2.6. */
81 #define ISPRINT(c) (ISASCII (c) && isprint (c))
83 /* Returns the number of columns needed to represent the multibyte
84 character string pointed to by STRING. If a non-printable character
85 occurs, -1 is returned.
86 This is the multibyte analogon of the wcswidth function. */
88 mbswidth (const char *string)
90 const char *p = string;
91 const char *plimit = p + strlen (p);
95 #if HAVE_MBRTOWC && (MB_LEN_MAX > 1)
101 case ' ': case '!': case '"': case '#': case '%':
102 case '&': case '\'': case '(': case ')': case '*':
103 case '+': case ',': case '-': case '.': case '/':
104 case '0': case '1': case '2': case '3': case '4':
105 case '5': case '6': case '7': case '8': case '9':
106 case ':': case ';': case '<': case '=': case '>':
108 case 'A': case 'B': case 'C': case 'D': case 'E':
109 case 'F': case 'G': case 'H': case 'I': case 'J':
110 case 'K': case 'L': case 'M': case 'N': case 'O':
111 case 'P': case 'Q': case 'R': case 'S': case 'T':
112 case 'U': case 'V': case 'W': case 'X': case 'Y':
114 case '[': case '\\': case ']': case '^': case '_':
115 case 'a': case 'b': case 'c': case 'd': case 'e':
116 case 'f': case 'g': case 'h': case 'i': case 'j':
117 case 'k': case 'l': case 'm': case 'n': case 'o':
118 case 'p': case 'q': case 'r': case 's': case 't':
119 case 'u': case 'v': case 'w': case 'x': case 'y':
120 case 'z': case '{': case '|': case '}': case '~':
121 /* These characters are printable ASCII characters. */
128 /* If we have a multibyte sequence, scan it up to its end. */
131 memset (&mbstate, 0, sizeof mbstate);
135 size_t bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
139 /* A null wide character was encountered. */
142 if (bytes == (size_t) -1)
143 /* An invalid multibyte sequence was encountered. */
146 if (bytes == (size_t) -2)
147 /* An incomplete multibyte character at the end. */
152 /* A printable multibyte character. */
155 /* An unprintable multibyte character. */
160 while (! mbsinit (&mbstate));
170 unsigned char c = (unsigned char) *p++;