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1479465f GJ |
1 | /* |
2 | * libdpkg - Debian packaging suite library routines | |
3 | * strwide.c - wide character string handling routines | |
4 | * | |
5 | * Copyright © 2004 Changwoo Ryu <cwryu@debian.org> | |
6 | * Copyright © 2012-2013 Guillem Jover <guillem@debian.org> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <config.h> | |
23 | #include <compat.h> | |
24 | ||
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
27 | #ifdef ENABLE_NLS | |
28 | #include <wchar.h> | |
29 | #endif | |
30 | ||
31 | #include <dpkg/i18n.h> | |
32 | #include <dpkg/dpkg.h> | |
33 | #include <dpkg/string.h> | |
34 | ||
35 | /** | |
36 | * Compute the screen width of a string. | |
37 | * | |
38 | * @param str The multibyte string. | |
39 | * | |
40 | * @return The width of the string. | |
41 | */ | |
42 | int | |
43 | str_width(const char *str) | |
44 | { | |
45 | #ifdef ENABLE_NLS | |
46 | mbstate_t state; | |
47 | wchar_t *wcs; | |
48 | const char *mbs = str; | |
49 | size_t len, res; | |
50 | int width; | |
51 | ||
52 | len = strlen(str) + 1; | |
53 | wcs = m_malloc(sizeof(wcs[0]) * len); | |
54 | ||
55 | memset(&state, 0, sizeof(state)); | |
56 | ||
57 | res = mbsrtowcs(wcs, &mbs, len, &state); | |
58 | if (res == (size_t)-1) { | |
59 | #ifdef DPKG_UNIFORM_ENCODING | |
60 | ohshit(_("cannot convert multibyte string '%s' " | |
61 | "to a wide-character string"), str); | |
62 | #else | |
63 | /* Cannot convert, fallback to ASCII method. */ | |
64 | free(wcs); | |
65 | return strlen(str); | |
66 | #endif | |
67 | } | |
68 | ||
69 | width = wcswidth(wcs, res); | |
70 | ||
71 | free(wcs); | |
72 | ||
73 | return width; | |
74 | #else | |
75 | return strlen(str); | |
76 | #endif | |
77 | } | |
78 | ||
79 | /** | |
80 | * Generate the crop values for a string given a maximum screen width. | |
81 | * | |
82 | * This function analyzes the string passed and computes the correct point | |
83 | * where to crop the string, returning the amount of string and maximum | |
84 | * bytes to use for padding for example. | |
85 | * | |
86 | * On NLS enabled builds, in addition the string will be cropped on any | |
87 | * newline. | |
88 | * | |
89 | * @param str The string to crop. | |
90 | * @param max_width The max screen width to use. | |
91 | * @param[out] crop The generated crop values for the string. | |
92 | */ | |
93 | void | |
94 | str_gen_crop(const char *str, int max_width, struct str_crop_info *crop) | |
95 | { | |
96 | #ifdef ENABLE_NLS | |
97 | mbstate_t state; | |
98 | size_t str_bytes; | |
99 | int mbs_bytes = 0; | |
100 | int mbs_width = 0; | |
101 | ||
102 | str_bytes = strlen(str) + 1; | |
103 | memset(&state, 0, sizeof(state)); | |
104 | ||
105 | for (;;) { | |
106 | wchar_t wc; | |
107 | int wc_width; | |
108 | size_t mb_bytes; | |
109 | ||
110 | mb_bytes = mbrtowc(&wc, str, str_bytes, &state); | |
111 | if (mb_bytes == (size_t)-1 || mb_bytes == (size_t)-2) { | |
112 | #ifdef DPKG_UNIFORM_ENCODING | |
113 | ohshit(_("cannot convert multibyte sequence '%s' " | |
114 | "to a wide character"), str); | |
115 | #else | |
116 | /* Cannot convert, fallback to ASCII method. */ | |
117 | crop->str_bytes = crop->max_bytes = max_width; | |
118 | return; | |
119 | #endif | |
120 | } | |
121 | if (mb_bytes == 0) | |
122 | break; | |
123 | ||
124 | wc_width = wcwidth(wc); | |
125 | if (wc_width < 0) | |
126 | break; | |
127 | if (mbs_width + wc_width > max_width) | |
128 | break; | |
129 | ||
130 | mbs_width += wc_width; | |
131 | mbs_bytes += mb_bytes; | |
132 | str_bytes -= mb_bytes; | |
133 | str += mb_bytes; | |
134 | } | |
135 | ||
136 | crop->str_bytes = mbs_bytes; | |
137 | crop->max_bytes = mbs_bytes + max_width - mbs_width; | |
138 | #else | |
139 | crop->str_bytes = crop->max_bytes = max_width; | |
140 | #endif | |
141 | } |