| 1 | /* Compare two wide strings using the current locale.
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| 2 | Copyright (C) 2011-2012 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <bruno@clisp.org>, 2011.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | int
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| 19 | wcscoll (const wchar_t *s1, const wchar_t *s2)
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| 20 | {
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| 21 | char mbbuf1[1024];
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| 22 | char mbbuf2[1024];
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| 23 | char *mbs1;
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| 24 | char *mbs2;
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| 25 |
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| 26 | {
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| 27 | int saved_errno = errno;
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| 28 |
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| 29 | /* Convert s1 to a multibyte string, trying to avoid malloc(). */
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| 30 | {
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| 31 | size_t ret;
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| 32 |
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| 33 | ret = wcstombs (mbbuf1, s1, sizeof (mbbuf1));
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| 34 | if (ret == (size_t)-1)
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| 35 | goto failed1;
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| 36 | if (ret < sizeof (mbbuf1))
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| 37 | mbs1 = mbbuf1;
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| 38 | else
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| 39 | {
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| 40 | size_t need = wcstombs (NULL, s1, 0);
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| 41 | if (need == (size_t)-1)
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| 42 | goto failed1;
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| 43 | mbs1 = (char *) malloc (need + 1);
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| 44 | if (mbs1 == NULL)
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| 45 | goto out_of_memory1;
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| 46 | ret = wcstombs (mbs1, s1, need + 1);
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| 47 | if (ret != need)
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| 48 | abort ();
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | /* Convert s2 to a multibyte string, trying to avoid malloc(). */
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| 53 | {
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| 54 | size_t ret;
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| 55 |
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| 56 | ret = wcstombs (mbbuf2, s2, sizeof (mbbuf2));
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| 57 | if (ret == (size_t)-1)
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| 58 | goto failed2;
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| 59 | if (ret < sizeof (mbbuf2))
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| 60 | mbs2 = mbbuf2;
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| 61 | else
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| 62 | {
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| 63 | size_t need = wcstombs (NULL, s2, 0);
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| 64 | if (need == (size_t)-1)
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| 65 | goto failed2;
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| 66 | mbs2 = (char *) malloc (need + 1);
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| 67 | if (mbs2 == NULL)
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| 68 | goto out_of_memory2;
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| 69 | ret = wcstombs (mbs2, s2, need + 1);
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| 70 | if (ret != need)
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| 71 | abort ();
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| 72 | }
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| 73 | }
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| 74 |
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| 75 | /* No error so far. */
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| 76 | errno = saved_errno;
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| 77 | }
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| 78 |
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| 79 | /* Compare the two multibyte strings. */
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| 80 | {
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| 81 | int result = strcoll (mbs1, mbs2);
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| 82 |
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| 83 | if (mbs1 != mbbuf1)
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| 84 | {
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| 85 | int saved_errno = errno;
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| 86 | free (mbs1);
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| 87 | errno = saved_errno;
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| 88 | }
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| 89 | if (mbs2 != mbbuf2)
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| 90 | {
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| 91 | int saved_errno = errno;
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| 92 | free (mbs2);
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| 93 | errno = saved_errno;
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| 94 | }
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| 95 | return result;
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| 96 | }
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| 97 |
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| 98 | out_of_memory2:
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| 99 | if (mbs1 != mbbuf1)
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| 100 | free (mbs1);
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| 101 | out_of_memory1:
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| 102 | errno = ENOMEM;
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| 103 | return 0;
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| 104 |
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| 105 | failed2:
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| 106 | if (mbs1 != mbbuf1)
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| 107 | free (mbs1);
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| 108 | failed1:
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| 109 | errno = EILSEQ;
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| 110 | return 0;
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| 111 | }
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