bfd/
[binutils.git] / libiberty / xmalloc.c
blob3e97aab563f0e409a3d65a6258ee911e89101eb5
1 /* memory allocation routines with error checking.
2 Copyright 1989, 90, 91, 92, 93, 94 Free Software Foundation, Inc.
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.
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.
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., 51 Franklin Street - Fifth Floor,
18 Boston, MA 02110-1301, USA. */
22 @deftypefn Replacement void* xmalloc (size_t)
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.
30 @end deftypefn
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.
36 @end deftypefn
38 @deftypefn Replacement void* xcalloc (size_t @var{nelem}, size_t @var{elsize})
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.
44 @end deftypefn
46 @deftypefn Replacement void xmalloc_set_program_name (const char *@var{name})
48 You can use this to set the name of the program used by
49 @code{xmalloc_failed} when printing a failure message.
51 @end deftypefn
53 @deftypefn Replacement void xmalloc_failed (size_t)
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.
59 @end deftypefn
63 #ifdef HAVE_CONFIG_H
64 #include "config.h"
65 #endif
66 #include "ansidecl.h"
67 #include "libiberty.h"
69 #include <stdio.h>
71 #include <stddef.h>
73 #if VMS
74 #include <stdlib.h>
75 #include <unixlib.h>
76 #else
77 /* For systems with larger pointers than ints, these must be declared. */
78 # if HAVE_STDLIB_H && HAVE_UNISTD_H && HAVE_DECL_MALLOC \
79 && HAVE_DECL_REALLOC && HAVE_DECL_CALLOC && HAVE_DECL_SBRK
80 # include <stdlib.h>
81 # include <unistd.h>
82 # else
83 # ifdef __cplusplus
84 extern "C" {
85 # endif /* __cplusplus */
86 void *malloc (size_t);
87 void *realloc (void *, size_t);
88 void *calloc (size_t, size_t);
89 void *sbrk (ptrdiff_t);
90 # ifdef __cplusplus
92 # endif /* __cplusplus */
93 # endif /* HAVE_STDLIB_H ... */
94 #endif /* VMS */
96 /* The program name if set. */
97 static const char *name = "";
99 #ifdef HAVE_SBRK
100 /* The initial sbrk, set when the program name is set. Not used for win32
101 ports other than cygwin32. */
102 static char *first_break = NULL;
103 #endif /* HAVE_SBRK */
105 void
106 xmalloc_set_program_name (const char *s)
108 name = s;
109 #ifdef HAVE_SBRK
110 /* Win32 ports other than cygwin32 don't have brk() */
111 if (first_break == NULL)
112 first_break = (char *) sbrk (0);
113 #endif /* HAVE_SBRK */
116 void
117 xmalloc_failed (size_t size)
119 #ifdef HAVE_SBRK
120 extern char **environ;
121 size_t allocated;
123 if (first_break != NULL)
124 allocated = (char *) sbrk (0) - first_break;
125 else
126 allocated = (char *) sbrk (0) - (char *) &environ;
127 fprintf (stderr,
128 "\n%s%sout of memory allocating %lu bytes after a total of %lu bytes\n",
129 name, *name ? ": " : "",
130 (unsigned long) size, (unsigned long) allocated);
131 #else /* HAVE_SBRK */
132 fprintf (stderr,
133 "\n%s%sout of memory allocating %lu bytes\n",
134 name, *name ? ": " : "",
135 (unsigned long) size);
136 #endif /* HAVE_SBRK */
137 xexit (1);
141 xmalloc (size_t size)
143 PTR newmem;
145 if (size == 0)
146 size = 1;
147 newmem = malloc (size);
148 if (!newmem)
149 xmalloc_failed (size);
151 return (newmem);
155 xcalloc (size_t nelem, size_t elsize)
157 PTR newmem;
159 if (nelem == 0 || elsize == 0)
160 nelem = elsize = 1;
162 newmem = calloc (nelem, elsize);
163 if (!newmem)
164 xmalloc_failed (nelem * elsize);
166 return (newmem);
170 xrealloc (PTR oldmem, size_t size)
172 PTR newmem;
174 if (size == 0)
175 size = 1;
176 if (!oldmem)
177 newmem = malloc (size);
178 else
179 newmem = realloc (oldmem, size);
180 if (!newmem)
181 xmalloc_failed (size);
183 return (newmem);