| 1 | /* memory allocation routines with error checking. |
| 2 | Copyright (C) 1989-2019 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 | } |