diff options
Diffstat (limited to 'lib/xmalloc.c')
| -rw-r--r-- | lib/xmalloc.c | 241 |
1 files changed, 0 insertions, 241 deletions
diff --git a/lib/xmalloc.c b/lib/xmalloc.c deleted file mode 100644 index 687633c2..00000000 --- a/lib/xmalloc.c +++ /dev/null | |||
| @@ -1,241 +0,0 @@ | |||
| 1 | /* xmalloc.c -- malloc with out of memory checking | ||
| 2 | |||
| 3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, | ||
| 4 | 1999, 2000, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. | ||
| 5 | |||
| 6 | This program is free software; you can redistribute it and/or modify | ||
| 7 | it under the terms of the GNU General Public License as published by | ||
| 8 | the Free Software Foundation; either version 2, or (at your option) | ||
| 9 | any later version. | ||
| 10 | |||
| 11 | This program is distributed in the hope that it will be useful, | ||
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 14 | GNU General Public License for more details. | ||
| 15 | |||
| 16 | You should have received a copy of the GNU General Public License | ||
| 17 | along with this program; if not, write to the Free Software Foundation, | ||
| 18 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | ||
| 19 | |||
| 20 | #ifdef HAVE_CONFIG_H | ||
| 21 | # include <config.h> | ||
| 22 | #endif | ||
| 23 | |||
| 24 | #include "xalloc.h" | ||
| 25 | |||
| 26 | #include <stdlib.h> | ||
| 27 | #include <string.h> | ||
| 28 | |||
| 29 | #ifndef SIZE_MAX | ||
| 30 | # define SIZE_MAX ((size_t) -1) | ||
| 31 | #endif | ||
| 32 | |||
| 33 | /* 1 if calloc is known to be compatible with GNU calloc. This | ||
| 34 | matters if we are not also using the calloc module, which defines | ||
| 35 | HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */ | ||
| 36 | #if defined HAVE_CALLOC || defined __GLIBC__ | ||
| 37 | enum { HAVE_GNU_CALLOC = 1 }; | ||
| 38 | #else | ||
| 39 | enum { HAVE_GNU_CALLOC = 0 }; | ||
| 40 | #endif | ||
| 41 | |||
| 42 | /* Allocate an array of N objects, each with S bytes of memory, | ||
| 43 | dynamically, with error checking. S must be nonzero. */ | ||
| 44 | |||
| 45 | static inline void * | ||
| 46 | xnmalloc_inline (size_t n, size_t s) | ||
| 47 | { | ||
| 48 | void *p; | ||
| 49 | if (xalloc_oversized (n, s) || (! (p = malloc (n * s)) && n != 0)) | ||
| 50 | xalloc_die (); | ||
| 51 | return p; | ||
| 52 | } | ||
| 53 | |||
| 54 | void * | ||
| 55 | xnmalloc (size_t n, size_t s) | ||
| 56 | { | ||
| 57 | return xnmalloc_inline (n, s); | ||
| 58 | } | ||
| 59 | |||
| 60 | /* Allocate N bytes of memory dynamically, with error checking. */ | ||
| 61 | |||
| 62 | void * | ||
| 63 | xmalloc (size_t n) | ||
| 64 | { | ||
| 65 | return xnmalloc_inline (n, 1); | ||
| 66 | } | ||
| 67 | |||
| 68 | /* Change the size of an allocated block of memory P to an array of N | ||
| 69 | objects each of S bytes, with error checking. S must be nonzero. */ | ||
| 70 | |||
| 71 | static inline void * | ||
| 72 | xnrealloc_inline (void *p, size_t n, size_t s) | ||
| 73 | { | ||
| 74 | if (xalloc_oversized (n, s) || (! (p = realloc (p, n * s)) && n != 0)) | ||
| 75 | xalloc_die (); | ||
| 76 | return p; | ||
| 77 | } | ||
| 78 | |||
| 79 | void * | ||
| 80 | xnrealloc (void *p, size_t n, size_t s) | ||
| 81 | { | ||
| 82 | return xnrealloc_inline (p, n, s); | ||
| 83 | } | ||
| 84 | |||
| 85 | /* Change the size of an allocated block of memory P to N bytes, | ||
| 86 | with error checking. */ | ||
| 87 | |||
| 88 | void * | ||
| 89 | xrealloc (void *p, size_t n) | ||
| 90 | { | ||
| 91 | return xnrealloc_inline (p, n, 1); | ||
| 92 | } | ||
| 93 | |||
| 94 | |||
| 95 | /* If P is null, allocate a block of at least *PN such objects; | ||
| 96 | otherwise, reallocate P so that it contains more than *PN objects | ||
| 97 | each of S bytes. *PN must be nonzero unless P is null, and S must | ||
| 98 | be nonzero. Set *PN to the new number of objects, and return the | ||
| 99 | pointer to the new block. *PN is never set to zero, and the | ||
| 100 | returned pointer is never null. | ||
| 101 | |||
| 102 | Repeated reallocations are guaranteed to make progress, either by | ||
| 103 | allocating an initial block with a nonzero size, or by allocating a | ||
| 104 | larger block. | ||
| 105 | |||
| 106 | In the following implementation, nonzero sizes are doubled so that | ||
| 107 | repeated reallocations have O(N log N) overall cost rather than | ||
| 108 | O(N**2) cost, but the specification for this function does not | ||
| 109 | guarantee that sizes are doubled. | ||
| 110 | |||
| 111 | Here is an example of use: | ||
| 112 | |||
| 113 | int *p = NULL; | ||
| 114 | size_t used = 0; | ||
| 115 | size_t allocated = 0; | ||
| 116 | |||
| 117 | void | ||
| 118 | append_int (int value) | ||
| 119 | { | ||
| 120 | if (used == allocated) | ||
| 121 | p = x2nrealloc (p, &allocated, sizeof *p); | ||
| 122 | p[used++] = value; | ||
| 123 | } | ||
| 124 | |||
| 125 | This causes x2nrealloc to allocate a block of some nonzero size the | ||
| 126 | first time it is called. | ||
| 127 | |||
| 128 | To have finer-grained control over the initial size, set *PN to a | ||
| 129 | nonzero value before calling this function with P == NULL. For | ||
| 130 | example: | ||
| 131 | |||
| 132 | int *p = NULL; | ||
| 133 | size_t used = 0; | ||
| 134 | size_t allocated = 0; | ||
| 135 | size_t allocated1 = 1000; | ||
| 136 | |||
| 137 | void | ||
| 138 | append_int (int value) | ||
| 139 | { | ||
| 140 | if (used == allocated) | ||
| 141 | { | ||
| 142 | p = x2nrealloc (p, &allocated1, sizeof *p); | ||
| 143 | allocated = allocated1; | ||
| 144 | } | ||
| 145 | p[used++] = value; | ||
| 146 | } | ||
| 147 | |||
| 148 | */ | ||
| 149 | |||
| 150 | static inline void * | ||
| 151 | x2nrealloc_inline (void *p, size_t *pn, size_t s) | ||
| 152 | { | ||
| 153 | size_t n = *pn; | ||
| 154 | |||
| 155 | if (! p) | ||
| 156 | { | ||
| 157 | if (! n) | ||
| 158 | { | ||
| 159 | /* The approximate size to use for initial small allocation | ||
| 160 | requests, when the invoking code specifies an old size of | ||
| 161 | zero. 64 bytes is the largest "small" request for the | ||
| 162 | GNU C library malloc. */ | ||
| 163 | enum { DEFAULT_MXFAST = 64 }; | ||
| 164 | |||
| 165 | n = DEFAULT_MXFAST / s; | ||
| 166 | n += !n; | ||
| 167 | } | ||
| 168 | } | ||
| 169 | else | ||
| 170 | { | ||
| 171 | if (SIZE_MAX / 2 / s < n) | ||
| 172 | xalloc_die (); | ||
| 173 | n *= 2; | ||
| 174 | } | ||
| 175 | |||
| 176 | *pn = n; | ||
| 177 | return xrealloc (p, n * s); | ||
| 178 | } | ||
| 179 | |||
| 180 | void * | ||
| 181 | x2nrealloc (void *p, size_t *pn, size_t s) | ||
| 182 | { | ||
| 183 | return x2nrealloc_inline (p, pn, s); | ||
| 184 | } | ||
| 185 | |||
| 186 | /* If P is null, allocate a block of at least *PN bytes; otherwise, | ||
| 187 | reallocate P so that it contains more than *PN bytes. *PN must be | ||
| 188 | nonzero unless P is null. Set *PN to the new block's size, and | ||
| 189 | return the pointer to the new block. *PN is never set to zero, and | ||
| 190 | the returned pointer is never null. */ | ||
| 191 | |||
| 192 | void * | ||
| 193 | x2realloc (void *p, size_t *pn) | ||
| 194 | { | ||
| 195 | return x2nrealloc_inline (p, pn, 1); | ||
| 196 | } | ||
| 197 | |||
| 198 | /* Allocate S bytes of zeroed memory dynamically, with error checking. | ||
| 199 | There's no need for xnzalloc (N, S), since it would be equivalent | ||
| 200 | to xcalloc (N, S). */ | ||
| 201 | |||
| 202 | void * | ||
| 203 | xzalloc (size_t s) | ||
| 204 | { | ||
| 205 | return memset (xmalloc (s), 0, s); | ||
| 206 | } | ||
| 207 | |||
| 208 | /* Allocate zeroed memory for N elements of S bytes, with error | ||
| 209 | checking. S must be nonzero. */ | ||
| 210 | |||
| 211 | void * | ||
| 212 | xcalloc (size_t n, size_t s) | ||
| 213 | { | ||
| 214 | void *p; | ||
| 215 | /* Test for overflow, since some calloc implementations don't have | ||
| 216 | proper overflow checks. But omit overflow and size-zero tests if | ||
| 217 | HAVE_GNU_CALLOC, since GNU calloc catches overflow and never | ||
| 218 | returns NULL if successful. */ | ||
| 219 | if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s)) | ||
| 220 | || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0))) | ||
| 221 | xalloc_die (); | ||
| 222 | return p; | ||
| 223 | } | ||
| 224 | |||
| 225 | /* Clone an object P of size S, with error checking. There's no need | ||
| 226 | for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any | ||
| 227 | need for an arithmetic overflow check. */ | ||
| 228 | |||
| 229 | void * | ||
| 230 | xmemdup (void const *p, size_t s) | ||
| 231 | { | ||
| 232 | return memcpy (xmalloc (s), p, s); | ||
| 233 | } | ||
| 234 | |||
| 235 | /* Clone STRING. */ | ||
| 236 | |||
| 237 | char * | ||
| 238 | xstrdup (char const *string) | ||
| 239 | { | ||
| 240 | return xmemdup (string, strlen (string) + 1); | ||
| 241 | } | ||
