1 /* Determine the number of screen columns needed for a string.
2 Copyright (C) 2000-2007 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 3 of the License, or
7 (at your option) any later version.
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, see <http://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible <haible@clisp.cons.org>. */
32 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */
40 # define mbsinit(ps) 1
44 /* Returns the number of columns needed to represent the multibyte
45 character string pointed to by STRING. If a non-printable character
46 occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.
47 With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is
48 the multibyte analogue of the wcswidth function.
49 If STRING is not of length < INT_MAX / 2, integer overflow can occur. */
51 mbswidth (const char *string, int flags)
53 return mbsnwidth (string, strlen (string), flags);
56 /* Returns the number of columns needed to represent the multibyte
57 character string pointed to by STRING of length NBYTES. If a
58 non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is
59 specified, -1 is returned.
60 If NBYTES is not < INT_MAX / 2, integer overflow can occur. */
62 mbsnwidth (const char *string, size_t nbytes, int flags)
64 const char *p = string;
65 const char *plimit = p + nbytes;
75 case ' ': case '!': case '"': case '#': case '%':
76 case '&': case '\'': case '(': case ')': case '*':
77 case '+': case ',': case '-': case '.': case '/':
78 case '0': case '1': case '2': case '3': case '4':
79 case '5': case '6': case '7': case '8': case '9':
80 case ':': case ';': case '<': case '=': case '>':
82 case 'A': case 'B': case 'C': case 'D': case 'E':
83 case 'F': case 'G': case 'H': case 'I': case 'J':
84 case 'K': case 'L': case 'M': case 'N': case 'O':
85 case 'P': case 'Q': case 'R': case 'S': case 'T':
86 case 'U': case 'V': case 'W': case 'X': case 'Y':
88 case '[': case '\\': case ']': case '^': case '_':
89 case 'a': case 'b': case 'c': case 'd': case 'e':
90 case 'f': case 'g': case 'h': case 'i': case 'j':
91 case 'k': case 'l': case 'm': case 'n': case 'o':
92 case 'p': case 'q': case 'r': case 's': case 't':
93 case 'u': case 'v': case 'w': case 'x': case 'y':
94 case 'z': case '{': case '|': case '}': case '~':
95 /* These characters are printable ASCII characters. */
100 /* If we have a multibyte sequence, scan it up to its end. */
103 memset (&mbstate, 0, sizeof mbstate);
110 bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
112 if (bytes == (size_t) -1)
113 /* An invalid multibyte sequence was encountered. */
115 if (!(flags & MBSW_REJECT_INVALID))
125 if (bytes == (size_t) -2)
126 /* An incomplete multibyte character at the end. */
128 if (!(flags & MBSW_REJECT_INVALID))
139 /* A null wide character was encountered. */
144 /* A printable multibyte character. */
147 /* An unprintable multibyte character. */
148 if (!(flags & MBSW_REJECT_UNPRINTABLE))
149 width += (iswcntrl (wc) ? 0 : 1);
155 while (! mbsinit (&mbstate));
165 unsigned char c = (unsigned char) *p++;
169 else if (!(flags & MBSW_REJECT_UNPRINTABLE))
170 width += (iscntrl (c) ? 0 : 1);