1 /* Determine the number of screen columns needed for a string.
2 Copyright (C) 2000-2017 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(). */
41 /* Returns the number of columns needed to represent the multibyte
42 character string pointed to by STRING. If a non-printable character
43 occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.
44 With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is
45 the multibyte analogue of the wcswidth function. */
47 mbswidth (const char *string
, int flags
)
49 return mbsnwidth (string
, strlen (string
), flags
);
52 /* Returns the number of columns needed to represent the multibyte
53 character string pointed to by STRING of length NBYTES. If a
54 non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is
55 specified, -1 is returned. */
57 mbsnwidth (const char *string
, size_t nbytes
, int flags
)
59 const char *p
= string
;
60 const char *plimit
= p
+ nbytes
;
69 case ' ': case '!': case '"': case '#': case '%':
70 case '&': case '\'': case '(': case ')': case '*':
71 case '+': case ',': case '-': case '.': case '/':
72 case '0': case '1': case '2': case '3': case '4':
73 case '5': case '6': case '7': case '8': case '9':
74 case ':': case ';': case '<': case '=': case '>':
76 case 'A': case 'B': case 'C': case 'D': case 'E':
77 case 'F': case 'G': case 'H': case 'I': case 'J':
78 case 'K': case 'L': case 'M': case 'N': case 'O':
79 case 'P': case 'Q': case 'R': case 'S': case 'T':
80 case 'U': case 'V': case 'W': case 'X': case 'Y':
82 case '[': case '\\': case ']': case '^': case '_':
83 case 'a': case 'b': case 'c': case 'd': case 'e':
84 case 'f': case 'g': case 'h': case 'i': case 'j':
85 case 'k': case 'l': case 'm': case 'n': case 'o':
86 case 'p': case 'q': case 'r': case 's': case 't':
87 case 'u': case 'v': case 'w': case 'x': case 'y':
88 case 'z': case '{': case '|': case '}': case '~':
89 /* These characters are printable ASCII characters. */
94 /* If we have a multibyte sequence, scan it up to its end. */
97 memset (&mbstate
, 0, sizeof mbstate
);
104 bytes
= mbrtowc (&wc
, p
, plimit
- p
, &mbstate
);
106 if (bytes
== (size_t) -1)
107 /* An invalid multibyte sequence was encountered. */
109 if (!(flags
& MBSW_REJECT_INVALID
))
119 if (bytes
== (size_t) -2)
120 /* An incomplete multibyte character at the end. */
122 if (!(flags
& MBSW_REJECT_INVALID
))
133 /* A null wide character was encountered. */
138 /* A printable multibyte character. */
140 if (w
> INT_MAX
- width
)
145 /* An unprintable multibyte character. */
146 if (!(flags
& MBSW_REJECT_UNPRINTABLE
))
150 if (width
== INT_MAX
)
160 while (! mbsinit (&mbstate
));
169 unsigned char c
= (unsigned char) *p
++;
173 if (width
== INT_MAX
)
177 else if (!(flags
& MBSW_REJECT_UNPRINTABLE
))
181 if (width
== INT_MAX
)