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annotate lib/unistr/u16-prev.c @ 17431:744044c581c4

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getcwd-lgpl: port to Tru64 * lib/getcwd-lgpl.c: Include <stdlib.h>, for malloc etc. Problem reported by Steven M. Schweda in <http://lists.gnu.org/archive/html/bug-gzip/2013-06/msg00010.html>.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 11 Jun 2013 19:52:46 -0700
parents e542fd46ad6f
children
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1 /* Iterate over previous character in UTF-16 string.
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2 Copyright (C) 2002, 2006-2007, 2009-2013 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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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 uint16_t *
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24 u16_prev (ucs4_t *puc, const uint16_t *s, const uint16_t *start)
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25 {
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26 /* Keep in sync with unistr.h and utf16-ucs4.c. */
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27 if (s != start)
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28 {
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29 uint16_t c_1 = s[-1];
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30
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31 if (c_1 < 0xd800 || c_1 >= 0xe000)
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32 {
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33 *puc = c_1;
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34 return s - 1;
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35 }
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36 #if CONFIG_UNICODE_SAFETY
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37 if (c_1 >= 0xdc00)
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38 #endif
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39 if (s - 1 != start)
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40 {
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41 uint16_t c_2 = s[-2];
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42
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43 #if CONFIG_UNICODE_SAFETY
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44 if (c_2 >= 0xd800 && c_2 < 0xdc00)
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45 #endif
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46 {
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47 *puc = 0x10000 + ((c_2 - 0xd800) << 10) + (c_1 - 0xdc00);
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48 return s - 2;
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49 }
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50 }
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51 }
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52 return NULL;
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53 }