1 /* memory allocation routines with error checking. 2 Copyright (C) 1989-2024 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., 51 Franklin Street - Fifth Floor, 18 Boston, MA 02110-1301, 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 #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 85 extern "C" { 86 # endif /* __cplusplus */ 87 void *malloc (size_t); 88 void *realloc (void *, size_t); 89 void *calloc (size_t, size_t); 90 #ifdef HAVE_SBRK 91 void *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. */ 100 static 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. */ 105 static char *first_break = NULL; 106 #endif /* HAVE_SBRK */ 107 108 void 109 xmalloc_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 } 118 119 void 120 xmalloc_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 } 141 142 void * 143 xmalloc (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 } 155 156 void * 157 xcalloc (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 } 170 171 void * 172 xrealloc (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