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annotate lib/unistr/u-cpy-alloc.h @ 40212:8da9577294da

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unistr/*, uniconv/*: Fix undefined behaviour. Reported by Jeffrey Walton <noloader@gmail.com>. * lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size. * lib/unistr/u-cpy-alloc.h (FUNC): Likewise. * lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise. * lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author Bruno Haible <bruno@clisp.org>
date Sat, 09 Mar 2019 00:01:47 +0100
parents b06060465f09
children
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1 /* Copy piece of UTF-8/UTF-16/UTF-32 string.
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2 Copyright (C) 1999, 2002, 2006-2007, 2009-2019 Free Software Foundation,
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3 Inc.
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4 Written by Bruno Haible <bruno@clisp.org>, 2002.
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5
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6 This program is free software: you can redistribute it and/or modify it
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7 under the terms of the GNU Lesser General Public License as published
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8 by the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 Lesser General Public License for more details.
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16 You should have received a copy of the GNU Lesser General Public License
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17 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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18
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19 #include <stdlib.h>
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20 #include <string.h>
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21
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22 UNIT *
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23 FUNC (const UNIT *s, size_t n)
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24 {
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25 UNIT *dest;
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26
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27 dest = (UNIT *) malloc (n > 0 ? n * sizeof (UNIT) : 1);
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28 if (dest != NULL)
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29 {
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30 #if 0
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31 UNIT *destptr = dest;
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32
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33 for (; n > 0; n--)
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34 *destptr++ = *s++;
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35 #else
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36 if (n > 0)
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37 memcpy ((char *) dest, (const char *) s, n * sizeof (UNIT));
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38 #endif
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39 }
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40 return dest;
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41 }