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7aae655 @bhaible New module 'wcscoll'.
bhaible authored
1 /* Compare two wide strings using the current locale.
2 Copyright (C) 2011 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2011.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 int
19 wcscoll (const wchar_t *s1, const wchar_t *s2)
20 {
21 char mbbuf1[1024];
22 char mbbuf2[1024];
23 char *mbs1;
24 char *mbs2;
25
26 {
27 int saved_errno = errno;
28
29 /* Convert s1 to a multibyte string, trying to avoid malloc(). */
30 {
31 size_t ret;
32
33 ret = wcstombs (mbbuf1, s1, sizeof (mbbuf1));
34 if (ret == (size_t)-1)
35 goto failed1;
36 if (ret < sizeof (mbbuf1))
37 mbs1 = mbbuf1;
38 else
39 {
40 size_t need = wcstombs (NULL, s1, 0);
41 if (need == (size_t)-1)
42 goto failed1;
43 mbs1 = (char *) malloc (need + 1);
44 if (mbs1 == NULL)
45 goto out_of_memory1;
46 ret = wcstombs (mbs1, s1, need + 1);
47 if (ret != need)
48 abort ();
49 }
50 }
51
52 /* Convert s2 to a multibyte string, trying to avoid malloc(). */
53 {
54 size_t ret;
55
56 ret = wcstombs (mbbuf2, s2, sizeof (mbbuf2));
57 if (ret == (size_t)-1)
58 goto failed2;
59 if (ret < sizeof (mbbuf2))
60 mbs2 = mbbuf2;
61 else
62 {
63 size_t need = wcstombs (NULL, s2, 0);
64 if (need == (size_t)-1)
65 goto failed2;
66 mbs2 = (char *) malloc (need + 1);
67 if (mbs2 == NULL)
68 goto out_of_memory2;
69 ret = wcstombs (mbs2, s2, need + 1);
70 if (ret != need)
71 abort ();
72 }
73 }
74
75 /* No error so far. */
76 errno = saved_errno;
77 }
78
79 /* Compare the two multibyte strings. */
80 {
81 int result = strcoll (mbs1, mbs2);
82
83 if (mbs1 != mbbuf1)
84 {
85 int saved_errno = errno;
86 free (mbs1);
87 errno = saved_errno;
88 }
89 if (mbs2 != mbbuf2)
90 {
91 int saved_errno = errno;
92 free (mbs2);
93 errno = saved_errno;
94 }
95 return result;
96 }
97
98 out_of_memory2:
99 if (mbs1 != mbbuf1)
100 free (mbs1);
101 out_of_memory1:
102 errno = ENOMEM;
103 return 0;
104
105 failed2:
106 if (mbs1 != mbbuf1)
107 free (mbs1);
108 failed1:
109 errno = EILSEQ;
110 return 0;
111 }
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