libiberty/xmalloc.c

   1 /* memory allocation routines with error checking.
   2    Copyright 1989, 90, 91, 92, 93, 94 Free Software Foundation, Inc.
   3
   4 This file is part of the libiberty library.
   5 Libiberty is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public
   7 License as published by the Free Software Foundation; either
   8 version 2 of the License, or (at your option) any later version.
   9
  10 Libiberty 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 GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with libiberty; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 /*
  21
  22 @deftypefn Replacement void* xmalloc (size_t)
  23
  24 Allocate memory without fail.  If @code{malloc} fails, this will print
  25 a message to @code{stderr} (using the name set by
  26 @code{xmalloc_set_program_name},
  27 if any) and then call @code{xexit}.  Note that it is therefore safe for
  28 a program to contain @code{#define malloc xmalloc} in its source.
  29
  30 @end deftypefn
  31
  32 @deftypefn Replacement void* xrealloc (void *@var{ptr}, size_t @var{size})
  33 Reallocate memory without fail.  This routine functions like @code{realloc},
  34 but will behave the same as @code{xmalloc} if memory cannot be found.
  35
  36 @end deftypefn
  37
  38 @deftypefn Replacement void* xcalloc (size_t @var{nelem}, size_t @var{elsize})
  39
  40 Allocate memory without fail, and set it to zero.  This routine functions
  41 like @code{calloc}, but will behave the same as @code{xmalloc} if memory
  42 cannot be found.
  43
  44 @end deftypefn
  45
  46 @deftypefn Replacement void xmalloc_set_program_name (const char *@var{name})
  47
  48 You can use this to set the name of the program used by
  49 @code{xmalloc_failed} when printing a failure message.
  50
  51 @end deftypefn
  52
  53 @deftypefn Replacement void xmalloc_failed (size_t)
  54
  55 This function is not meant to be called by client code, and is listed
  56 here for completeness only.  If any of the allocation routines fail, this
  57 function will be called to print an error message and terminate execution.
  58
  59 @end deftypefn
  60
  61 */
  62
  63 #ifdef HAVE_CONFIG_H
  64 #include "config.h"
  65 #endif
  66 #include "ansidecl.h"
  67 #include "libiberty.h"
  68
  69 #include <stdio.h>
  70
  71 #ifdef __STDC__
  72 #include <stddef.h>
  73 #else
  74 #define size_t unsigned long
  75 #define ptrdiff_t long
  76 #endif
  77
  78 #if VMS
  79 #include <stdlib.h>
  80 #include <unixlib.h>
  81 #else
  82 /* For systems with larger pointers than ints, these must be declared.  */
  83 PTR malloc PARAMS ((size_t));
  84 PTR realloc PARAMS ((PTR, size_t));
  85 PTR calloc PARAMS ((size_t, size_t));
  86 PTR sbrk PARAMS ((ptrdiff_t));
  87 #endif
  88
  89 /* The program name if set.  */
  90 static const char *name = "";
  91
  92 #ifdef HAVE_SBRK
  93 /* The initial sbrk, set when the program name is set. Not used for win32
  94    ports other than cygwin32.  */
  95 static char *first_break = NULL;
  96 #endif /* HAVE_SBRK */
  97
  98 void
  99 xmalloc_set_program_name (s)
 100      const char *s;
 101 {
 102   name = s;
 103 #ifdef HAVE_SBRK
 104   /* Win32 ports other than cygwin32 don't have brk() */
 105   if (first_break == NULL)
 106     first_break = (char *) sbrk (0);
 107 #endif /* HAVE_SBRK */
 108 }
 109
 110 void
 111 xmalloc_failed (size)
 112      size_t size;
 113 {
 114 #ifdef HAVE_SBRK
 115   extern char **environ;
 116   size_t allocated;
 117
 118   if (first_break != NULL)
 119     allocated = (char *) sbrk (0) - first_break;
 120   else
 121     allocated = (char *) sbrk (0) - (char *) &environ;
 122   fprintf (stderr,
 123            "\n%s%sCannot allocate %lu bytes after allocating %lu bytes\n",
 124            name, *name ? ": " : "",
 125            (unsigned long) size, (unsigned long) allocated);
 126 #else /* HAVE_SBRK */
 127   fprintf (stderr,
 128            "\n%s%sCannot allocate %lu bytes\n",
 129            name, *name ? ": " : "",
 130            (unsigned long) size);
 131 #endif /* HAVE_SBRK */
 132   xexit (1);
 133 }
 134
 135 PTR
 136 xmalloc (size)
 137     size_t size;
 138 {
 139   PTR newmem;
 140
 141   if (size == 0)
 142     size = 1;
 143   newmem = malloc (size);
 144   if (!newmem)
 145     xmalloc_failed (size);
 146
 147   return (newmem);
 148 }
 149
 150 PTR
 151 xcalloc (nelem, elsize)
 152   size_t nelem, elsize;
 153 {
 154   PTR newmem;
 155
 156   if (nelem == 0 || elsize == 0)
 157     nelem = elsize = 1;
 158
 159   newmem = calloc (nelem, elsize);
 160   if (!newmem)
 161     xmalloc_failed (nelem * elsize);
 162
 163   return (newmem);
 164 }
 165
 166 PTR
 167 xrealloc (oldmem, size)
 168     PTR oldmem;
 169     size_t size;
 170 {
 171   PTR newmem;
 172
 173   if (size == 0)
 174     size = 1;
 175   if (!oldmem)
 176     newmem = malloc (size);
 177   else
 178     newmem = realloc (oldmem, size);
 179   if (!newmem)
 180     xmalloc_failed (size);
 181
 182   return (newmem);
 183 }