xmalloc.c

   1 /*
   2  * Copyright 2004-2005 Timo Hirvonen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  */
  19
  20 #include "xmalloc.h"
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <errno.h>
  26
  27 extern char *program_name;
  28
  29 void malloc_fail(void)
  30 {
  31         fprintf(stderr, "%s: could not allocate memory: %s\n", program_name, strerror(errno));
  32         exit(42);
  33 }
  34
  35 char *xstrndup(const char *str, size_t n)
  36 {
  37         int len;
  38         char *s;
  39
  40         for (len = 0; len < n && str[len]; len++)
  41                 ;
  42         s = malloc(len + 1);
  43         if (unlikely(s == NULL))
  44                 malloc_fail();
  45         memcpy(s, str, len);
  46         s[len] = 0;
  47         return s;
  48 }