xmalloc.c revision 1.1.1.6
1/* memory allocation routines with error checking. 2 Copyright (C) 1989-2022 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 (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 (0) - first_break; 127 else 128 allocated = (char *) sbrk (0) - (char *) &environ; 129 fprintf (stderr, 130 "\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 (1); 140} 141 142void * 143xmalloc (size_t size) 144{ 145 void *newmem; 146 147 if (size == 0) 148 size = 1; 149 newmem = malloc (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 (nelem, elsize); 165 if (!newmem) 166 xmalloc_failed (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); 180 else 181 newmem = realloc (oldmem, size); 182 if (!newmem) 183 xmalloc_failed (size); 184 185 return (newmem); 186} 187