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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* Line breaking of UTF-8 strings.
Copyright (C) 2001-2003, 2006-2024 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2001.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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
Lesser General Public License and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unilbrk.h"
#include "unilbrk/internal.h"
#include "unilbrk/lbrktables.h"
#include "unistr.h"
#include "uniwidth.h"
int
u8_width_linebreaks_internal (const uint8_t *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding, int cr,
char *p)
{
const uint8_t *s_end;
char *last_p;
int last_column;
int piece_width;
u8_possible_linebreaks_loop (s, n, encoding, cr, p);
s_end = s + n;
last_p = NULL;
last_column = start_column;
piece_width = 0;
while (s < s_end)
{
ucs4_t uc;
int count = u8_mbtouc_unsafe (&uc, s, s_end - s);
/* Respect the override. */
if (o != NULL && *o != UC_BREAK_UNDEFINED)
*p = *o;
if (*p == UC_BREAK_POSSIBLE
|| *p == UC_BREAK_MANDATORY || *p == UC_BREAK_CR_BEFORE_LF)
{
/* An atomic piece of text ends here. */
if (last_p != NULL && last_column + piece_width > width)
{
/* Insert a line break. */
*last_p = UC_BREAK_POSSIBLE;
last_column = 0;
}
}
if (*p == UC_BREAK_MANDATORY || *p == UC_BREAK_CR_BEFORE_LF)
{
/* uc is a line break character. */
/* Start a new piece at column 0. */
last_p = NULL;
last_column = 0;
piece_width = 0;
}
else
{
/* uc is not a line break character. */
int w;
if (*p == UC_BREAK_POSSIBLE)
{
/* Start a new piece. */
last_p = p;
last_column += piece_width;
piece_width = 0;
/* No line break for the moment, may be turned into
UC_BREAK_POSSIBLE later, via last_p. */
}
*p = UC_BREAK_PROHIBITED;
w = uc_width (uc, encoding);
if (w >= 0) /* ignore control characters in the string */
piece_width += w;
}
s += count;
p += count;
if (o != NULL)
o += count;
}
/* The last atomic piece of text ends here. */
if (last_p != NULL && last_column + piece_width + at_end_columns > width)
{
/* Insert a line break. */
*last_p = UC_BREAK_POSSIBLE;
last_column = 0;
}
return last_column + piece_width;
}
#if defined IN_LIBUNISTRING
/* For backward compatibility with older versions of libunistring. */
# undef u8_width_linebreaks
int
u8_width_linebreaks (const uint8_t *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p)
{
return u8_width_linebreaks_internal (s, n,
width, start_column, at_end_columns,
o, encoding, -1, p);
}
#endif
int
u8_width_linebreaks_v2 (const uint8_t *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p)
{
return u8_width_linebreaks_internal (s, n,
width, start_column, at_end_columns,
o, encoding, LBP_CR, p);
}
#ifdef TEST
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Read the contents of an input stream, and return it, terminated with a NUL
byte. */
char *
read_file (FILE *stream)
{
#define BUFSIZE 4096
char *buf = NULL;
int alloc = 0;
int size = 0;
int count;
while (! feof (stream))
{
if (size + BUFSIZE > alloc)
{
alloc = alloc + alloc / 2;
if (alloc < size + BUFSIZE)
alloc = size + BUFSIZE;
buf = realloc (buf, alloc);
if (buf == NULL)
{
fprintf (stderr, "out of memory\n");
exit (1);
}
}
count = fread (buf + size, 1, BUFSIZE, stream);
if (count == 0)
{
if (ferror (stream))
{
perror ("fread");
exit (1);
}
}
else
size += count;
}
buf = realloc (buf, size + 1);
if (buf == NULL)
{
fprintf (stderr, "out of memory\n");
exit (1);
}
buf[size] = '\0';
return buf;
#undef BUFSIZE
}
int
main (int argc, char * argv[])
{
if (argc == 2)
{
/* Insert line breaks for a given width. */
int width = atoi (argv[1]);
char *input = read_file (stdin);
int length = strlen (input);
char *breaks = malloc (length);
int i;
u8_width_linebreaks_v2 ((uint8_t *) input, length, width, 0, 0, NULL, "UTF-8", breaks);
for (i = 0; i < length; i++)
{
switch (breaks[i])
{
case UC_BREAK_POSSIBLE:
putc ('\n', stdout);
break;
case UC_BREAK_MANDATORY:
break;
case UC_BREAK_CR_BEFORE_LF:
break;
case UC_BREAK_PROHIBITED:
break;
default:
abort ();
}
putc (input[i], stdout);
}
free (breaks);
return 0;
}
else
return 1;
}
#endif /* TEST */
|
