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