locale/programs/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990,91,92,93,94,95,96,97,2004,2005,2012
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   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
   8    by the Free Software Foundation; version 2 of the License, or
   9    (at your option) 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, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #define VOID void
  24
  25 #include <sys/types.h>
  26
  27 #if STDC_HEADERS || _LIBC
  28 #include <stdlib.h>
  29 static VOID *fixup_null_alloc (size_t n) __THROW;
  30 VOID *xmalloc (size_t n) __THROW;
  31 VOID *xcalloc (size_t n, size_t s) __THROW;
  32 VOID *xrealloc (VOID *p, size_t n) __THROW;
  33 #else
  34 VOID *calloc ();
  35 VOID *malloc ();
  36 VOID *realloc ();
  37 void free ();
  38 #endif
  39
  40 #include <libintl.h>
  41 #include "error.h"
  42
  43 #ifndef _
  44 # define _(str) gettext (str)
  45 #endif
  46
  47 #ifndef EXIT_FAILURE
  48 #define EXIT_FAILURE 4
  49 #endif
  50
  51 /* Exit value when the requested amount of memory is not available.
  52    The caller may set it to some other value.  */
  53 int xmalloc_exit_failure = EXIT_FAILURE;
  54
  55 static VOID *
  56 fixup_null_alloc (n)
  57      size_t n;
  58 {
  59   VOID *p;
  60
  61   p = 0;
  62   if (n == 0)
  63     p = malloc ((size_t) 1);
  64   if (p == 0)
  65     error (xmalloc_exit_failure, 0, _("memory exhausted"));
  66   return p;
  67 }
  68
  69 /* Allocate N bytes of memory dynamically, with error checking.  */
  70
  71 VOID *
  72 xmalloc (n)
  73      size_t n;
  74 {
  75   VOID *p;
  76
  77   p = malloc (n);
  78   if (p == 0)
  79     p = fixup_null_alloc (n);
  80   return p;
  81 }
  82
  83 /* Allocate memory for N elements of S bytes, with error checking.  */
  84
  85 VOID *
  86 xcalloc (n, s)
  87      size_t n, s;
  88 {
  89   VOID *p;
  90
  91   p = calloc (n, s);
  92   if (p == 0)
  93     p = fixup_null_alloc (n);
  94   return p;
  95 }
  96
  97 /* Change the size of an allocated block of memory P to N bytes,
  98    with error checking.
  99    If P is NULL, run xmalloc.  */
 100
 101 VOID *
 102 xrealloc (p, n)
 103      VOID *p;
 104      size_t n;
 105 {
 106   if (p == 0)
 107     return xmalloc (n);
 108   p = realloc (p, n);
 109   if (p == 0)
 110     p = fixup_null_alloc (n);
 111   return p;
 112 }