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265
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1 /* xmalloc.c -- malloc with out of memory checking
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2
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3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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4 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2008-2009 Free Software Foundation,
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5 Inc.
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6
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7 This program is free software: you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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19
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20 #include <config.h>
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21
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22 #if ! HAVE_INLINE
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23 # define static_inline
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24 #endif
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25 #include "xalloc.h"
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26 #undef static_inline
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27
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28 #include <stdlib.h>
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29 #include <string.h>
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30
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31 /* 1 if calloc is known to be compatible with GNU calloc. This
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32 matters if we are not also using the calloc module, which defines
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33 HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */
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34 #if defined HAVE_CALLOC || defined __GLIBC__
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35 enum { HAVE_GNU_CALLOC = 1 };
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36 #else
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37 enum { HAVE_GNU_CALLOC = 0 };
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38 #endif
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39
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40 /* Allocate N bytes of memory dynamically, with error checking. */
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41
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42 void *
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43 xmalloc (size_t n)
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44 {
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45 void *p = malloc (n);
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46 if (!p && n != 0)
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47 xalloc_die ();
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48 return p;
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49 }
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50
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51 /* Change the size of an allocated block of memory P to N bytes,
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52 with error checking. */
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53
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54 void *
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55 xrealloc (void *p, size_t n)
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56 {
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57 p = realloc (p, n);
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58 if (!p && n != 0)
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59 xalloc_die ();
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60 return p;
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61 }
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62
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63 /* If P is null, allocate a block of at least *PN bytes; otherwise,
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64 reallocate P so that it contains more than *PN bytes. *PN must be
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65 nonzero unless P is null. Set *PN to the new block's size, and
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66 return the pointer to the new block. *PN is never set to zero, and
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67 the returned pointer is never null. */
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68
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69 void *
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70 x2realloc (void *p, size_t *pn)
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71 {
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72 return x2nrealloc (p, pn, 1);
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73 }
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74
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75 /* Allocate S bytes of zeroed memory dynamically, with error checking.
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76 There's no need for xnzalloc (N, S), since it would be equivalent
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77 to xcalloc (N, S). */
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78
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79 void *
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80 xzalloc (size_t s)
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81 {
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82 return memset (xmalloc (s), 0, s);
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83 }
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84
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85 /* Allocate zeroed memory for N elements of S bytes, with error
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86 checking. S must be nonzero. */
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87
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88 void *
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89 xcalloc (size_t n, size_t s)
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90 {
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91 void *p;
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92 /* Test for overflow, since some calloc implementations don't have
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93 proper overflow checks. But omit overflow and size-zero tests if
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94 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
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95 returns NULL if successful. */
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96 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
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97 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
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98 xalloc_die ();
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99 return p;
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100 }
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101
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102 /* Clone an object P of size S, with error checking. There's no need
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103 for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
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104 need for an arithmetic overflow check. */
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105
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106 void *
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107 xmemdup (void const *p, size_t s)
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108 {
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109 return memcpy (xmalloc (s), p, s);
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110 }
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111
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112 /* Clone STRING. */
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113
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114 char *
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115 xstrdup (char const *string)
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116 {
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117 return xmemdup (string, strlen (string) + 1);
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118 }
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