locale/programs/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published
   7    by the Free Software Foundation; version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #include <config.h>
  20 #endif
  21
  22 #define VOID void
  23
  24 #include <sys/types.h>
  25
  26 #if STDC_HEADERS || _LIBC
  27 #include <stdlib.h>
  28 static VOID *fixup_null_alloc (size_t n) __THROW;
  29 VOID *xmalloc (size_t n) __THROW;
  30 VOID *xcalloc (size_t n, size_t s) __THROW;
  31 VOID *xrealloc (VOID *p, size_t n) __THROW;
  32 #else
  33 VOID *calloc ();
  34 VOID *malloc ();
  35 VOID *realloc ();
  36 void free ();
  37 #endif
  38
  39 #include <libintl.h>
  40 #include "error.h"
  41
  42 #ifndef _
  43 # define _(str) gettext (str)
  44 #endif
  45
  46 #ifndef EXIT_FAILURE
  47 #define EXIT_FAILURE 4
  48 #endif
  49
  50 /* Exit value when the requested amount of memory is not available.
  51    The caller may set it to some other value.  */
  52 int xmalloc_exit_failure = EXIT_FAILURE;
  53
  54 static VOID *
  55 fixup_null_alloc (size_t n)
  56 {
  57   VOID *p;
  58
  59   p = 0;
  60   if (n == 0)
  61     p = malloc ((size_t) 1);
  62   if (p == 0)
  63     error (xmalloc_exit_failure, 0, _("memory exhausted"));
  64   return p;
  65 }
  66
  67 /* Allocate N bytes of memory dynamically, with error checking.  */
  68
  69 VOID *
  70 xmalloc (size_t n)
  71 {
  72   VOID *p;
  73
  74   p = malloc (n);
  75   if (p == 0)
  76     p = fixup_null_alloc (n);
  77   return p;
  78 }
  79
  80 /* Allocate memory for N elements of S bytes, with error checking.  */
  81
  82 VOID *
  83 xcalloc (size_t n, size_t s)
  84 {
  85   VOID *p;
  86
  87   p = calloc (n, s);
  88   if (p == 0)
  89     p = fixup_null_alloc (n);
  90   return p;
  91 }
  92
  93 /* Change the size of an allocated block of memory P to N bytes,
  94    with error checking.
  95    If P is NULL, run xmalloc.  */
  96
  97 VOID *
  98 xrealloc (VOID *p, size_t n)
  99 {
 100   if (p == 0)
 101     return xmalloc (n);
 102   p = realloc (p, n);
 103   if (p == 0)
 104     p = fixup_null_alloc (n);
 105   return p;
 106 }