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annotate lib/unicase/u-casecmp.h @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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1 /* Case and normalization insensitive comparison of Unicode strings.
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2 Copyright (C) 2009-2019 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2009.
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4
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5 This program is free software: you can redistribute it and/or modify it
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6 under the terms of the GNU Lesser General Public License as published
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7 by 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 GNU
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13 Lesser 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 Lesser General Public License
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16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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17
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18 int
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19 FUNC (const SRC_UNIT *s1, size_t n1, const SRC_UNIT *s2, size_t n2,
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20 const char *iso639_language, uninorm_t nf, int *resultp)
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21 {
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22 UNIT buf1[2048 / sizeof (UNIT)];
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23 UNIT buf2[2048 / sizeof (UNIT)];
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24 UNIT *norms1;
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25 size_t norms1_length;
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26 UNIT *norms2;
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27 size_t norms2_length;
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28 int cmp;
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29
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30 /* Optimization: There is no need to do canonical composition of each string.
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31 Decomposition is enough. */
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32 if (nf != NULL)
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33 nf = uninorm_decomposing_form (nf);
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34
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35 /* Case-fold and normalize S1. */
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36 norms1_length = sizeof (buf1) / sizeof (UNIT);
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37 norms1 = U_CASEFOLD (s1, n1, iso639_language, nf, buf1, &norms1_length);
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38 if (norms1 == NULL)
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39 /* errno is set here. */
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40 return -1;
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41
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42 /* Case-fold and normalize S2. */
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43 norms2_length = sizeof (buf2) / sizeof (UNIT);
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44 norms2 = U_CASEFOLD (s2, n2, iso639_language, nf, buf2, &norms2_length);
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45 if (norms2 == NULL)
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46 {
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47 if (norms1 != buf1)
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48 {
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49 int saved_errno = errno;
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50 free (norms1);
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51 errno = saved_errno;
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52 }
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53 return -1;
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54 }
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55
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56 /* Compare the normalized strings. */
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57 cmp = U_CMP2 (norms1, norms1_length, norms2, norms2_length);
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58 if (cmp > 0)
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59 cmp = 1;
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60 else if (cmp < 0)
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61 cmp = -1;
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62
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63 if (norms2 != buf2)
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64 free (norms2);
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65 if (norms1 != buf1)
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66 free (norms1);
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67 *resultp = cmp;
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68 return 0;
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69 }