xmalloc.c

   1 /*
   2  * $Id: xmalloc.c,v 1.7 2005/09/26 15:59:04 cduval Exp $
   3  *
   4  * Common xmalloc memory allocation routines
   5  *
   6  * written by Jaakko Heinonen <jheinonen@users.sourceforge.net>
   7  */
   8
   9 /*
  10  * Copyright (c) 2005 Jaakko Heinonen
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer
  18  *    in this position and unchanged.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include "gettext.h"
  40 #include "xmalloc.h"
  41
  42 static void
  43 xmalloc_default_error_handler(int err)
  44 {
  45         fprintf(stderr, _("Memory allocation failure: %s\n"), strerror(err));
  46         exit(EXIT_FAILURE);
  47 }
  48
  49 static void (*xmalloc_handle_error)(int err) = xmalloc_default_error_handler;
  50
  51 void
  52 xmalloc_set_error_handler(void (*func)(int err))
  53 {
  54         if(func)
  55                 xmalloc_handle_error = func;
  56         else
  57                 xmalloc_handle_error = xmalloc_default_error_handler;
  58 }
  59
  60 void *
  61 xmalloc(size_t size)
  62 {
  63         void *p;
  64
  65         if((p = malloc(size)) == NULL)
  66                 (*xmalloc_handle_error)(errno);
  67
  68         return p;
  69 }
  70
  71 void *
  72 xmalloc0(size_t size)
  73 {
  74         void *p;
  75
  76         p = xmalloc(size);
  77         if(p)
  78                 memset(p, 0, size);
  79
  80         return p;
  81 }
  82
  83 static void *
  84 _xmalloc_inc(size_t size, size_t inc, int zero)
  85 {
  86         size_t total_size = size + inc;
  87
  88         /*
  89          * check if the calculation overflowed
  90          */
  91         if(total_size < size) {
  92                 (*xmalloc_handle_error)(EINVAL);
  93                 return NULL;
  94         }
  95
  96         return zero ? xmalloc0(total_size) : xmalloc(total_size);
  97 }
  98
  99 void *
 100 xmalloc_inc(size_t size, size_t inc)
 101 {
 102         return _xmalloc_inc(size, inc, 0);
 103 }
 104
 105 void *
 106 xmalloc0_inc(size_t size, size_t inc)
 107 {
 108         return _xmalloc_inc(size, inc, 1);
 109 }
 110
 111 void *
 112 xrealloc(void *ptr, size_t size)
 113 {
 114         if((ptr = realloc(ptr, size)) == NULL)
 115                 (*xmalloc_handle_error)(errno);
 116
 117         return ptr;
 118 }
 119
 120 void *
 121 xrealloc_inc(void *ptr, size_t size, size_t inc)
 122 {
 123         size_t total_size = size + inc;
 124
 125         /*
 126          * check if the calculation overflowed
 127          */
 128         if(total_size < size) {
 129                 (*xmalloc_handle_error)(EINVAL);
 130                 return NULL;
 131         }
 132
 133         if((ptr = realloc(ptr, total_size)) == NULL)
 134                 (*xmalloc_handle_error)(errno);
 135
 136         return ptr;
 137 }
 138
 139 char *
 140 xstrdup(const char *s)
 141 {
 142         size_t len = strlen(s);
 143         void *new;
 144
 145         new = xmalloc_inc(len, 1);
 146         if(new == NULL)
 147                 return NULL;
 148
 149         return (char *)memcpy(new, s, len + 1);
 150 }
 151
 152 char *
 153 xstrndup(const char *s, size_t len)
 154 {
 155         char *new;
 156         size_t n = strlen(s);
 157
 158         if(n > len)
 159                 n = len;
 160
 161         new = xmalloc_inc(n, 1);
 162         if(new == NULL)
 163                 return NULL;
 164
 165         memcpy(new, s, n);
 166         new[n] = '\0';
 167
 168         return new;
 169 }