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1 /* memory allocation routines with error checking.
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145
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2 Copyright (C) 1989-2020 Free Software Foundation, Inc.
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3
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4 This file is part of the libiberty library.
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5 Libiberty is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 Libiberty is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with libiberty; see the file COPYING.LIB. If
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17 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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18 Boston, MA 02110-1301, USA. */
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19
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20 /*
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21
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22 @deftypefn Replacement void* xmalloc (size_t)
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23
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24 Allocate memory without fail. If @code{malloc} fails, this will print
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25 a message to @code{stderr} (using the name set by
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26 @code{xmalloc_set_program_name},
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27 if any) and then call @code{xexit}. Note that it is therefore safe for
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28 a program to contain @code{#define malloc xmalloc} in its source.
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29
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30 @end deftypefn
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31
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32 @deftypefn Replacement void* xrealloc (void *@var{ptr}, size_t @var{size})
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33 Reallocate memory without fail. This routine functions like @code{realloc},
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34 but will behave the same as @code{xmalloc} if memory cannot be found.
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35
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36 @end deftypefn
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37
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38 @deftypefn Replacement void* xcalloc (size_t @var{nelem}, size_t @var{elsize})
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39
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40 Allocate memory without fail, and set it to zero. This routine functions
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41 like @code{calloc}, but will behave the same as @code{xmalloc} if memory
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42 cannot be found.
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43
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44 @end deftypefn
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45
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46 @deftypefn Replacement void xmalloc_set_program_name (const char *@var{name})
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47
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48 You can use this to set the name of the program used by
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49 @code{xmalloc_failed} when printing a failure message.
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50
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51 @end deftypefn
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52
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53 @deftypefn Replacement void xmalloc_failed (size_t)
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54
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55 This function is not meant to be called by client code, and is listed
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56 here for completeness only. If any of the allocation routines fail, this
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57 function will be called to print an error message and terminate execution.
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58
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59 @end deftypefn
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60
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61 */
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62
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63 #ifdef HAVE_CONFIG_H
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64 #include "config.h"
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65 #endif
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66 #include "ansidecl.h"
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67 #include "libiberty.h"
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111
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68 #include "environ.h"
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0
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69
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70 #include <stdio.h>
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71
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72 #include <stddef.h>
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73
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74 #if VMS
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75 #include <stdlib.h>
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76 #include <unixlib.h>
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77 #else
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78 /* For systems with larger pointers than ints, these must be declared. */
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79 # if HAVE_STDLIB_H && HAVE_UNISTD_H && HAVE_DECL_MALLOC \
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80 && HAVE_DECL_REALLOC && HAVE_DECL_CALLOC && HAVE_DECL_SBRK
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81 # include <stdlib.h>
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82 # include <unistd.h>
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83 # else
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84 # ifdef __cplusplus
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85 extern "C" {
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86 # endif /* __cplusplus */
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87 void *malloc (size_t);
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88 void *realloc (void *, size_t);
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89 void *calloc (size_t, size_t);
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90 void *sbrk (ptrdiff_t);
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91 # ifdef __cplusplus
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92 }
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93 # endif /* __cplusplus */
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94 # endif /* HAVE_STDLIB_H ... */
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95 #endif /* VMS */
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96
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97 /* The program name if set. */
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98 static const char *name = "";
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99
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100 #ifdef HAVE_SBRK
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101 /* The initial sbrk, set when the program name is set. Not used for win32
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102 ports other than cygwin32. */
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103 static char *first_break = NULL;
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104 #endif /* HAVE_SBRK */
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105
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106 void
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107 xmalloc_set_program_name (const char *s)
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108 {
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109 name = s;
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110 #ifdef HAVE_SBRK
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111 /* Win32 ports other than cygwin32 don't have brk() */
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112 if (first_break == NULL)
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113 first_break = (char *) sbrk (0);
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114 #endif /* HAVE_SBRK */
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115 }
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116
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117 void
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118 xmalloc_failed (size_t size)
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119 {
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120 #ifdef HAVE_SBRK
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121 size_t allocated;
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122
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123 if (first_break != NULL)
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124 allocated = (char *) sbrk (0) - first_break;
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125 else
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126 allocated = (char *) sbrk (0) - (char *) &environ;
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127 fprintf (stderr,
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128 "\n%s%sout of memory allocating %lu bytes after a total of %lu bytes\n",
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129 name, *name ? ": " : "",
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130 (unsigned long) size, (unsigned long) allocated);
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131 #else /* HAVE_SBRK */
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132 fprintf (stderr,
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133 "\n%s%sout of memory allocating %lu bytes\n",
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134 name, *name ? ": " : "",
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135 (unsigned long) size);
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136 #endif /* HAVE_SBRK */
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137 xexit (1);
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138 }
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139
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140 PTR
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141 xmalloc (size_t size)
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142 {
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143 PTR newmem;
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144
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145 if (size == 0)
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146 size = 1;
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147 newmem = malloc (size);
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148 if (!newmem)
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149 xmalloc_failed (size);
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150
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151 return (newmem);
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152 }
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153
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154 PTR
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155 xcalloc (size_t nelem, size_t elsize)
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156 {
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157 PTR newmem;
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158
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159 if (nelem == 0 || elsize == 0)
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160 nelem = elsize = 1;
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161
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162 newmem = calloc (nelem, elsize);
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163 if (!newmem)
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164 xmalloc_failed (nelem * elsize);
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165
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166 return (newmem);
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167 }
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168
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169 PTR
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170 xrealloc (PTR oldmem, size_t size)
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171 {
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172 PTR newmem;
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173
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174 if (size == 0)
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175 size = 1;
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176 if (!oldmem)
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177 newmem = malloc (size);
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178 else
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179 newmem = realloc (oldmem, size);
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180 if (!newmem)
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181 xmalloc_failed (size);
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182
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183 return (newmem);
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184 }
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