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annotate lib/unistr/u32-prev.c @ 12421:e8d2c6fc33ad

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Use spaces for indentation, not tabs.
author Bruno Haible <bruno@clisp.org>
date Thu, 10 Dec 2009 20:28:30 +0100
parents ad8a75a45dc9
children b5e42ef33b49
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af4391ae3012 New modules 'unistr/u8-prev', 'unistr/u16-prev', 'unistr/u32-prev'.
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1 /* Iterate over previous character in UTF-32 string.
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2 Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2002.
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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 <http://www.gnu.org/licenses/>. */
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18 #include <config.h>
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20 /* Specification. */
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21 #include "unistr.h"
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23 const uint32_t *
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24 u32_prev (ucs4_t *puc, const uint32_t *s, const uint32_t *start)
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25 {
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26 if (s != start)
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27 {
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28 uint32_t c_1 = s[-1];
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29
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30 #if CONFIG_UNICODE_SAFETY
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31 if (c_1 < 0xd800 || (c_1 >= 0xe000 && c_1 < 0x110000))
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32 #endif
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33 {
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34 *puc = c_1;
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35 return s - 1;
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36 }
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37 }
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38 return NULL;
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39 }