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annotate lib/realloc.c @ 9928:9a02133ad731

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Add tentative support for Linux libc5.
author Bruno Haible <bruno@clisp.org>
date Thu, 17 Apr 2008 02:01:23 +0200
parents 19e60ffc2be6
children e8d2c6fc33ad
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1 /* realloc() function that is glibc compatible.
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2
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3 Copyright (C) 1997, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 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
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13 GNU 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 General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* written by Jim Meyering and Bruno Haible */
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19
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20 #include <config.h>
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21
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22 /* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */
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23 #ifdef realloc
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24 # define NEED_REALLOC_GNU 1
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25 #endif
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27 /* Infer the properties of the system's malloc function.
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28 Only the AC_FUNC_MALLOC macro defines 'malloc' already in config.h. */
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29 #if GNULIB_MALLOC_GNU && !defined malloc
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30 # define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1
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31 #endif
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32
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33 /* Below we want to call the system's malloc and realloc.
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34 Undefine the symbols here so that including <stdlib.h> provides a
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35 declaration of malloc(), not of rpl_malloc(), and likewise for realloc. */
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36 #undef malloc
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37 #undef realloc
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38
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39 /* Specification. */
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40 #include <stdlib.h>
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41
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42 #include <errno.h>
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44 /* Below we want to call the system's malloc and realloc.
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45 Undefine the symbols, if they were defined by gnulib's <stdlib.h>
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46 replacement. */
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47 #undef malloc
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48 #undef realloc
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49
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50 /* Change the size of an allocated block of memory P to N bytes,
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51 with error checking. If N is zero, change it to 1. If P is NULL,
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52 use malloc. */
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54 void *
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55 rpl_realloc (void *p, size_t n)
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56 {
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57 void *result;
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59 #if NEED_REALLOC_GNU
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60 if (n == 0)
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61 {
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62 n = 1;
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63
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64 /* In theory realloc might fail, so don't rely on it to free. */
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65 free (p);
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66 p = NULL;
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67 }
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68 #endif
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70 if (p == NULL)
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71 {
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72 #if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
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73 if (n == 0)
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74 n = 1;
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75 #endif
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76 result = malloc (n);
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77 }
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78 else
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79 result = realloc (p, n);
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81 #if !HAVE_REALLOC_POSIX
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82 if (result == NULL)
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83 errno = ENOMEM;
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84 #endif
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85
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86 return result;
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87 }