| 1 | /* xmalloc.c -- malloc with out of memory checking |
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| 2 | Copyright (C) 1990-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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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 |
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| 7 | by the Free Software Foundation; version 2 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 <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #ifdef HAVE_CONFIG_H |
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| 19 | #include <config.h> |
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| 20 | #endif |
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| 21 | |
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| 22 | #define VOID void |
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| 23 | |
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| 24 | #include <sys/types.h> |
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| 25 | |
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| 26 | #if STDC_HEADERS || _LIBC |
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| 27 | #include <stdlib.h> |
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| 28 | static VOID *fixup_null_alloc (size_t n) __THROW; |
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| 29 | VOID *xmalloc (size_t n) __THROW; |
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| 30 | VOID *xcalloc (size_t n, size_t s) __THROW; |
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| 31 | VOID *xrealloc (VOID *p, size_t n) __THROW; |
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| 32 | #else |
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| 33 | VOID *calloc (); |
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| 34 | VOID *malloc (); |
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| 35 | VOID *realloc (); |
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| 36 | void free (); |
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| 37 | #endif |
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| 38 | |
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| 39 | #include <libintl.h> |
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| 40 | #include "error.h" |
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| 41 | |
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| 42 | #ifndef _ |
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| 43 | # define _(str) gettext (str) |
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| 44 | #endif |
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| 45 | |
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| 46 | #ifndef EXIT_FAILURE |
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| 47 | #define EXIT_FAILURE 4 |
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| 48 | #endif |
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| 49 | |
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| 50 | /* Exit value when the requested amount of memory is not available. |
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| 51 | The caller may set it to some other value. */ |
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| 52 | int xmalloc_exit_failure = EXIT_FAILURE; |
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| 53 | |
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| 54 | static VOID * |
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| 55 | fixup_null_alloc (size_t n) |
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| 56 | { |
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| 57 | VOID *p; |
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| 58 | |
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| 59 | p = 0; |
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| 60 | if (n == 0) |
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| 61 | p = malloc (size: (size_t) 1); |
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| 62 | if (p == 0) |
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| 63 | error (status: xmalloc_exit_failure, errnum: 0, _("memory exhausted" )); |
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| 64 | return p; |
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| 65 | } |
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| 66 | |
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| 67 | /* Allocate N bytes of memory dynamically, with error checking. */ |
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| 68 | |
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| 69 | VOID * |
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| 70 | xmalloc (size_t n) |
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| 71 | { |
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| 72 | VOID *p; |
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| 73 | |
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| 74 | p = malloc (size: n); |
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| 75 | if (p == 0) |
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| 76 | p = fixup_null_alloc (n); |
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| 77 | return p; |
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| 78 | } |
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| 79 | |
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| 80 | /* Allocate memory for N elements of S bytes, with error checking. */ |
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| 81 | |
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| 82 | VOID * |
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| 83 | xcalloc (size_t n, size_t s) |
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| 84 | { |
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| 85 | VOID *p; |
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| 86 | |
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| 87 | p = calloc (nmemb: n, size: s); |
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| 88 | if (p == 0) |
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| 89 | p = fixup_null_alloc (n); |
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| 90 | return p; |
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| 91 | } |
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| 92 | |
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| 93 | /* Change the size of an allocated block of memory P to N bytes, |
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| 94 | with error checking. |
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| 95 | If P is NULL, run xmalloc. */ |
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| 96 | |
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| 97 | VOID * |
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| 98 | xrealloc (VOID *p, size_t n) |
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| 99 | { |
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| 100 | if (p == 0) |
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| 101 | return xmalloc (n); |
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| 102 | p = realloc (ptr: p, size: n); |
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| 103 | if (p == 0) |
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| 104 | p = fixup_null_alloc (n); |
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| 105 | return p; |
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| 106 | } |
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| 107 | |
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