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272
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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 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 #ifndef SIZE_MAX
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32 # define SIZE_MAX ((size_t) -1)
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33 #endif
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34
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35 /* 1 if calloc is known to be compatible with GNU calloc. This
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36 matters if we are not also using the calloc module, which defines
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37 HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */
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38 #if defined HAVE_CALLOC || defined __GLIBC__
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39 enum { HAVE_GNU_CALLOC = 1 };
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40 #else
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41 enum { HAVE_GNU_CALLOC = 0 };
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42 #endif
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43
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44 /* Allocate N bytes of memory dynamically, with error checking. */
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45
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46 void *
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47 xmalloc (size_t n)
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48 {
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49 void *p = malloc (n);
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50 if (!p && n != 0)
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51 xalloc_die ();
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52 return p;
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53 }
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54
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55 /* Change the size of an allocated block of memory P to N bytes,
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56 with error checking. */
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57
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58 void *
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59 xrealloc (void *p, size_t n)
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60 {
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61 p = realloc (p, n);
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62 if (!p && n != 0)
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63 xalloc_die ();
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64 return p;
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65 }
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66
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67 /* If P is null, allocate a block of at least *PN bytes; otherwise,
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68 reallocate P so that it contains more than *PN bytes. *PN must be
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69 nonzero unless P is null. Set *PN to the new block's size, and
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70 return the pointer to the new block. *PN is never set to zero, and
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71 the returned pointer is never null. */
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72
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73 void *
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74 x2realloc (void *p, size_t *pn)
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75 {
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76 return x2nrealloc (p, pn, 1);
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77 }
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78
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79 /* Allocate S bytes of zeroed memory dynamically, with error checking.
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80 There's no need for xnzalloc (N, S), since it would be equivalent
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81 to xcalloc (N, S). */
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82
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83 void *
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84 xzalloc (size_t s)
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85 {
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86 return memset (xmalloc (s), 0, s);
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87 }
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88
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89 /* Allocate zeroed memory for N elements of S bytes, with error
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90 checking. S must be nonzero. */
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91
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92 void *
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93 xcalloc (size_t n, size_t s)
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94 {
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95 void *p;
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96 /* Test for overflow, since some calloc implementations don't have
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97 proper overflow checks. But omit overflow and size-zero tests if
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98 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
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99 returns NULL if successful. */
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100 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
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101 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
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102 xalloc_die ();
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103 return p;
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104 }
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105
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106 /* Clone an object P of size S, with error checking. There's no need
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107 for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
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108 need for an arithmetic overflow check. */
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109
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110 void *
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111 xmemdup (void const *p, size_t s)
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112 {
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113 return memcpy (xmalloc (s), p, s);
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114 }
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115
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116 /* Clone STRING. */
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117
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118 char *
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119 xstrdup (char const *string)
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120 {
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121 return xmemdup (string, strlen (string) + 1);
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122 }
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