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| 1 /* Determine the number of screen columns needed for a string. |
| 2 Copyright (C) 2000-2007 Free Software Foundation, Inc. |
| 3 |
| 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. |
| 8 |
| 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. |
| 13 |
| 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/>. */ |
| 16 |
| 17 /* Written by Bruno Haible <haible@clisp.cons.org>. */ |
| 18 |
| 19 #include <config.h> |
| 20 |
| 21 /* Specification. */ |
| 22 #include "mbswidth.h" |
| 23 |
| 24 /* Get MB_CUR_MAX. */ |
| 25 #include <stdlib.h> |
| 26 |
| 27 #include <string.h> |
| 28 |
| 29 /* Get isprint(). */ |
| 30 #include <ctype.h> |
| 31 |
| 32 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */ |
| 33 #include <wchar.h> |
| 34 |
| 35 /* Get iswcntrl(). */ |
| 36 #include <wctype.h> |
| 37 |
| 38 #ifndef mbsinit |
| 39 # if !HAVE_MBSINIT |
| 40 # define mbsinit(ps) 1 |
| 41 # endif |
| 42 #endif |
| 43 |
| 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. */ |
| 50 int |
| 51 mbswidth (const char *string, int flags) |
| 52 { |
| 53 return mbsnwidth (string, strlen (string), flags); |
| 54 } |
| 55 |
| 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. */ |
| 61 int |
| 62 mbsnwidth (const char *string, size_t nbytes, int flags) |
| 63 { |
| 64 const char *p = string; |
| 65 const char *plimit = p + nbytes; |
| 66 int width; |
| 67 |
| 68 width = 0; |
| 69 #if HAVE_MBRTOWC |
| 70 if (MB_CUR_MAX > 1) |
| 71 { |
| 72 while (p < plimit) |
| 73 switch (*p) |
| 74 { |
| 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 '>': |
| 81 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': |
| 87 case 'Z': |
| 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. */ |
| 96 p++; |
| 97 width++; |
| 98 break; |
| 99 default: |
| 100 /* If we have a multibyte sequence, scan it up to its end. */ |
| 101 { |
| 102 mbstate_t mbstate; |
| 103 memset (&mbstate, 0, sizeof mbstate); |
| 104 do |
| 105 { |
| 106 wchar_t wc; |
| 107 size_t bytes; |
| 108 int w; |
| 109 |
| 110 bytes = mbrtowc (&wc, p, plimit - p, &mbstate); |
| 111 |
| 112 if (bytes == (size_t) -1) |
| 113 /* An invalid multibyte sequence was encountered. */ |
| 114 { |
| 115 if (!(flags & MBSW_REJECT_INVALID)) |
| 116 { |
| 117 p++; |
| 118 width++; |
| 119 break; |
| 120 } |
| 121 else |
| 122 return -1; |
| 123 } |
| 124 |
| 125 if (bytes == (size_t) -2) |
| 126 /* An incomplete multibyte character at the end. */ |
| 127 { |
| 128 if (!(flags & MBSW_REJECT_INVALID)) |
| 129 { |
| 130 p = plimit; |
| 131 width++; |
| 132 break; |
| 133 } |
| 134 else |
| 135 return -1; |
| 136 } |
| 137 |
| 138 if (bytes == 0) |
| 139 /* A null wide character was encountered. */ |
| 140 bytes = 1; |
| 141 |
| 142 w = wcwidth (wc); |
| 143 if (w >= 0) |
| 144 /* A printable multibyte character. */ |
| 145 width += w; |
| 146 else |
| 147 /* An unprintable multibyte character. */ |
| 148 if (!(flags & MBSW_REJECT_UNPRINTABLE)) |
| 149 width += (iswcntrl (wc) ? 0 : 1); |
| 150 else |
| 151 return -1; |
| 152 |
| 153 p += bytes; |
| 154 } |
| 155 while (! mbsinit (&mbstate)); |
| 156 } |
| 157 break; |
| 158 } |
| 159 return width; |
| 160 } |
| 161 #endif |
| 162 |
| 163 while (p < plimit) |
| 164 { |
| 165 unsigned char c = (unsigned char) *p++; |
| 166 |
| 167 if (isprint (c)) |
| 168 width++; |
| 169 else if (!(flags & MBSW_REJECT_UNPRINTABLE)) |
| 170 width += (iscntrl (c) ? 0 : 1); |
| 171 else |
| 172 return -1; |
| 173 } |
| 174 return width; |
| 175 } |
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