1/* memory allocation routines with error checking.
2 Copyright (C) 1989-2023 Free Software Foundation, Inc.
3
4This file is part of the libiberty library.
5Libiberty is free software; you can redistribute it and/or
6modify it under the terms of the GNU Library General Public
7License as published by the Free Software Foundation; either
8version 2 of the License, or (at your option) any later version.
9
10Libiberty is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13Library General Public License for more details.
14
15You should have received a copy of the GNU Library General Public
16License along with libiberty; see the file COPYING.LIB. If
17not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
18Boston, MA 02110-1301, USA. */
19
20/*
21
22@deftypefn Replacement void* xmalloc (size_t)
23
24Allocate memory without fail. If @code{malloc} fails, this will print
25a message to @code{stderr} (using the name set by
26@code{xmalloc_set_program_name},
27if any) and then call @code{xexit}. Note that it is therefore safe for
28a 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})
33Reallocate memory without fail. This routine functions like @code{realloc},
34but 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
40Allocate memory without fail, and set it to zero. This routine functions
41like @code{calloc}, but will behave the same as @code{xmalloc} if memory
42cannot be found.
43
44@end deftypefn
45
46@deftypefn Replacement void xmalloc_set_program_name (const char *@var{name})
47
48You 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
55This function is not meant to be called by client code, and is listed
56here for completeness only. If any of the allocation routines fail, this
57function 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#include "environ.h"
69
70#include <stdio.h>
71
72#include <stddef.h>
73
74#if VMS
75#include <stdlib.h>
76#include <unixlib.h>
77#else
78/* For systems with larger pointers than ints, these must be declared. */
79# if HAVE_STDLIB_H && HAVE_UNISTD_H && HAVE_DECL_MALLOC \
80 && HAVE_DECL_REALLOC && HAVE_DECL_CALLOC && HAVE_DECL_SBRK
81# include <stdlib.h>
82# include <unistd.h>
83# else
84# ifdef __cplusplus
85extern "C" {
86# endif /* __cplusplus */
87void *malloc (size_t);
88void *realloc (void *, size_t);
89void *calloc (size_t, size_t);
90#ifdef HAVE_SBRK
91void *sbrk (ptrdiff_t);
92#endif
93# ifdef __cplusplus
94}
95# endif /* __cplusplus */
96# endif /* HAVE_STDLIB_H ... */
97#endif /* VMS */
98
99/* The program name if set. */
100static const char *name = "";
101
102#ifdef HAVE_SBRK
103/* The initial sbrk, set when the program name is set. Not used for win32
104 ports other than cygwin32. */
105static char *first_break = NULL;
106#endif /* HAVE_SBRK */
107
108void
109xmalloc_set_program_name (const char *s)
110{
111 name = s;
112#ifdef HAVE_SBRK
113 /* Win32 ports other than cygwin32 don't have brk() */
114 if (first_break == NULL)
115 first_break = (char *) sbrk (delta: 0);
116#endif /* HAVE_SBRK */
117}
118
119void
120xmalloc_failed (size_t size)
121{
122#ifdef HAVE_SBRK
123 size_t allocated;
124
125 if (first_break != NULL)
126 allocated = (char *) sbrk (delta: 0) - first_break;
127 else
128 allocated = (char *) sbrk (delta: 0) - (char *) &environ;
129 fprintf (stderr,
130 format: "\n%s%sout of memory allocating %lu bytes after a total of %lu bytes\n",
131 name, *name ? ": " : "",
132 (unsigned long) size, (unsigned long) allocated);
133#else /* HAVE_SBRK */
134 fprintf (stderr,
135 "\n%s%sout of memory allocating %lu bytes\n",
136 name, *name ? ": " : "",
137 (unsigned long) size);
138#endif /* HAVE_SBRK */
139 xexit (status: 1);
140}
141
142void *
143xmalloc (size_t size)
144{
145 void *newmem;
146
147 if (size == 0)
148 size = 1;
149 newmem = malloc (size: size);
150 if (!newmem)
151 xmalloc_failed (size);
152
153 return (newmem);
154}
155
156void *
157xcalloc (size_t nelem, size_t elsize)
158{
159 void *newmem;
160
161 if (nelem == 0 || elsize == 0)
162 nelem = elsize = 1;
163
164 newmem = calloc (nmemb: nelem, size: elsize);
165 if (!newmem)
166 xmalloc_failed (size: nelem * elsize);
167
168 return (newmem);
169}
170
171void *
172xrealloc (void *oldmem, size_t size)
173{
174 void *newmem;
175
176 if (size == 0)
177 size = 1;
178 if (!oldmem)
179 newmem = malloc (size: size);
180 else
181 newmem = realloc (ptr: oldmem, size: size);
182 if (!newmem)
183 xmalloc_failed (size);
184
185 return (newmem);
186}
187

source code of libiberty/xmalloc.c