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
|
/* Locale-specific case-ignoring memory comparison.
Copyright (C) 2001, 2009-2021 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2001.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "mbmemcasecoll.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/* Get tolower(). */
#include <ctype.h>
/* Get mbstate_t, mbrtowc(), wcrtomb(). */
#include <wchar.h>
/* Get towlower(). */
#include <wctype.h>
#include "malloca.h"
#include "memcmp2.h"
#include "memcoll.h"
#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
/* Apply towlower() to the multibyte character sequence in INBUF, storing the
result as a multibyte character sequence in OUTBUF. */
static size_t
apply_towlower (const char *inbuf, size_t inbufsize,
char *outbuf, size_t outbufsize)
{
char *outbuf_orig = outbuf;
size_t remaining;
remaining = inbufsize;
while (remaining > 0)
{
wchar_t wc1;
size_t n1;
mbstate_t state;
memset (&state, '\0', sizeof (mbstate_t));
n1 = mbrtowc (&wc1, inbuf, remaining, &state);
if (n1 == (size_t)(-2))
break;
if (n1 != (size_t)(-1))
{
wint_t wc2;
if (n1 == 0) /* NUL character? */
n1 = 1;
wc2 = towlower (wc1);
if (wc2 != wc1)
{
size_t n2;
memset (&state, '\0', sizeof (mbstate_t));
n2 = wcrtomb (outbuf, wc2, &state);
if (n2 != (size_t)(-1))
{
/* Store the translated multibyte character. */
inbuf += n1;
remaining -= n1;
outbuf += n2;
continue;
}
}
/* Nothing to translate. */
memcpy (outbuf, inbuf, n1);
inbuf += n1;
remaining -= n1;
outbuf += n1;
continue;
}
/* Invalid multibyte character on input.
Copy one byte without modification. */
*outbuf++ = *inbuf++;
remaining -= 1;
}
/* Incomplete multibyte sequence on input.
Pass it through unmodified. */
while (remaining > 0)
{
*outbuf++ = *inbuf++;
remaining -= 1;
}
/* Verify the output buffer was large enough. */
if (outbuf - outbuf_orig > outbufsize)
abort ();
/* Return the number of written output bytes. */
return outbuf - outbuf_orig;
}
/* Apply tolower() to the unibyte character sequence in INBUF, storing the
result as a unibyte character sequence in OUTBUF. */
static void
apply_tolower (const char *inbuf, char *outbuf, size_t bufsize)
{
for (; bufsize > 0; bufsize--)
{
*outbuf = TOLOWER ((unsigned char) *inbuf);
inbuf++;
outbuf++;
}
}
int
mbmemcasecoll (const char *s1, size_t s1len, const char *s2, size_t s2len,
bool hard_LC_COLLATE)
{
char *t1;
size_t t1len;
char *t2;
size_t t2len;
char *memory;
int cmp;
if (MB_CUR_MAX > 1)
{
/* Application of towlower grows each character by a factor 2
at most. */
t1len = 2 * s1len;
t2len = 2 * s2len;
}
else
{
/* Application of tolower doesn't change the size. */
t1len = s1len;
t2len = s2len;
}
/* Allocate memory for t1 and t2. */
memory = (char *) malloca (t1len + 1 + t2len + 1);
if (memory == NULL)
{
errno = ENOMEM;
return 0;
}
t1 = memory;
t2 = memory + t1len + 1;
/* Csae-fold the two argument strings. */
if (MB_CUR_MAX > 1)
{
t1len = apply_towlower (s1, s1len, t1, t1len);
t2len = apply_towlower (s2, s2len, t2, t2len);
}
else
{
apply_tolower (s1, t1, s1len);
apply_tolower (s2, t2, s2len);
}
/* Compare the two case-folded strings. */
if (hard_LC_COLLATE)
cmp = memcoll (t1, t1len, t2, t2len);
else
{
cmp = memcmp2 (t1, t1len, t2, t2len);
errno = 0;
}
{
int saved_errno = errno;
freea (memory);
errno = saved_errno;
}
return cmp;
}
|
