1 /* Determine the number of screen columns needed for a string.
2 Copyright (C) 2000-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Bruno Haible <haible@clisp.cons.org>. */
33 /* Get mbstate_t, mbrtowc(), mbsinit(). */
35 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
37 BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
52 # define mbsinit(ps) 1
56 /* Returns the number of columns needed to represent the multibyte
57 character string pointed to by STRING. If a non-printable character
58 occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.
59 With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is
60 the multibyte analogue of the wcswidth function.
61 If STRING is not of length < INT_MAX / 2, integer overflow can occur. */
63 mbswidth (const char *string, int flags)
65 return mbsnwidth (string, strlen (string), flags);
68 /* Returns the number of columns needed to represent the multibyte
69 character string pointed to by STRING of length NBYTES. If a
70 non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is
71 specified, -1 is returned.
72 If NBYTES is not < INT_MAX / 2, integer overflow can occur. */
74 mbsnwidth (const char *string, size_t nbytes, int flags)
76 const char *p = string;
77 const char *plimit = p + nbytes;
87 case ' ': case '!': case '"': case '#': case '%':
88 case '&': case '\'': case '(': case ')': case '*':
89 case '+': case ',': case '-': case '.': case '/':
90 case '0': case '1': case '2': case '3': case '4':
91 case '5': case '6': case '7': case '8': case '9':
92 case ':': case ';': case '<': case '=': case '>':
94 case 'A': case 'B': case 'C': case 'D': case 'E':
95 case 'F': case 'G': case 'H': case 'I': case 'J':
96 case 'K': case 'L': case 'M': case 'N': case 'O':
97 case 'P': case 'Q': case 'R': case 'S': case 'T':
98 case 'U': case 'V': case 'W': case 'X': case 'Y':
100 case '[': case '\\': case ']': case '^': case '_':
101 case 'a': case 'b': case 'c': case 'd': case 'e':
102 case 'f': case 'g': case 'h': case 'i': case 'j':
103 case 'k': case 'l': case 'm': case 'n': case 'o':
104 case 'p': case 'q': case 'r': case 's': case 't':
105 case 'u': case 'v': case 'w': case 'x': case 'y':
106 case 'z': case '{': case '|': case '}': case '~':
107 /* These characters are printable ASCII characters. */
112 /* If we have a multibyte sequence, scan it up to its end. */
115 memset (&mbstate, 0, sizeof mbstate);
122 bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
124 if (bytes == (size_t) -1)
125 /* An invalid multibyte sequence was encountered. */
127 if (!(flags & MBSW_REJECT_INVALID))
137 if (bytes == (size_t) -2)
138 /* An incomplete multibyte character at the end. */
140 if (!(flags & MBSW_REJECT_INVALID))
151 /* A null wide character was encountered. */
156 /* A printable multibyte character. */
159 /* An unprintable multibyte character. */
160 if (!(flags & MBSW_REJECT_UNPRINTABLE))
161 width += (iswcntrl (wc) ? 0 : 1);
167 while (! mbsinit (&mbstate));
177 unsigned char c = (unsigned char) *p++;
181 else if (!(flags & MBSW_REJECT_UNPRINTABLE))
182 width += (iscntrl (c) ? 0 : 1);