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annotate lib/strdup.c @ 3997:c1f0c85e44eb

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(strdup): Tweak comment and initial #if/#include.
author Jim Meyering <jim@meyering.net>
date Thu, 21 Nov 2002 13:33:10 +0000
parents 3e25885877b3
children 7158a1db8695
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1 /* Copyright (C) 1991, 1996, 1997, 1998, 2002 Free Software Foundation, Inc.
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2 This file is part of the GNU C Library.
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3
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4 The GNU C Library is free software; you can redistribute it and/or
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5 modify it under the terms of the GNU Lesser General Public
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6 License as published by the Free Software Foundation; either
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7 version 2.1 of the License, or (at your option) any later version.
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8
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9 The GNU C Library is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 Lesser General Public License for more details.
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13
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14 You should have received a copy of the GNU Lesser General Public
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15 License along with the GNU C Library; if not, write to the Free
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16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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17 02111-1307 USA. */
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18
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19 #if HAVE_CONFIG_H
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20 # include <config.h>
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21 #endif
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23 #if defined _LIBC || defined STDC_HEADERS
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24 # include <stdlib.h>
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25 # include <string.h>
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26 #else
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27 char *malloc ();
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28 char *memcpy ();
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29 #endif
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30
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31 #undef __strdup
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32 #undef strdup
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33
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34 #ifndef weak_alias
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35 # define __strdup strdup
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36 #endif
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37
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38 /* Duplicate S, returning an identical malloc'd string.
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39 Return NULL if out of memory. */
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40
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41 char *
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42 __strdup (const char *s)
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43 {
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44 size_t len = strlen (s) + 1;
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45 void *new = malloc (len);
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46
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47 if (new == NULL)
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48 return NULL;
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50 return (char *) memcpy (new, s, len);
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51 }
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52 #ifdef libc_hidden_def
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53 libc_hidden_def (__strdup)
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54 #endif
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55 #ifdef weak_alias
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56 weak_alias (__strdup, strdup)
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57 #endif