1 /* memory allocation routines with error checking. 2 Copyright (C) 1989-2020 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 void *sbrk (ptrdiff_t); 91 # ifdef __cplusplus 92 } 93 # endif /* __cplusplus */ 94 # endif /* HAVE_STDLIB_H ... */ 95 #endif /* VMS */ 96 97 /* The program name if set. */ 98 static const char *name = ""; 99 100 #ifdef HAVE_SBRK 101 /* The initial sbrk, set when the program name is set. Not used for win32 102 ports other than cygwin32. */ 103 static char *first_break = NULL; 104 #endif /* HAVE_SBRK */ 105 106 void 107 xmalloc_set_program_name (const char *s) 108 { 109 name = s; 110 #ifdef HAVE_SBRK 111 /* Win32 ports other than cygwin32 don't have brk() */ 112 if (first_break == NULL) 113 first_break = (char *) sbrk (0); 114 #endif /* HAVE_SBRK */ 115 } 116 117 void 118 xmalloc_failed (size_t size) 119 { 120 #ifdef HAVE_SBRK 121 size_t allocated; 122 123 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); 138 } 139 140 PTR 141 xmalloc (size_t size) 142 { 143 PTR newmem; 144 145 if (size == 0) 146 size = 1; 147 newmem = malloc (size); 148 if (!newmem) 149 xmalloc_failed (size); 150 151 return (newmem); 152 } 153 154 PTR 155 xcalloc (size_t nelem, size_t elsize) 156 { 157 PTR newmem; 158 159 if (nelem == 0 || elsize == 0) 160 nelem = elsize = 1; 161 162 newmem = calloc (nelem, elsize); 163 if (!newmem) 164 xmalloc_failed (nelem * elsize); 165 166 return (newmem); 167 } 168 169 PTR 170 xrealloc (PTR oldmem, size_t size) 171 { 172 PTR newmem; 173 174 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); 182 183 return (newmem); 184 } 185