libbb/xfuncs.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include "libbb.h"
  27
  28 extern void *xmalloc(size_t size)
  29 {
  30         void *ptr = malloc(size);
  31         if (ptr == NULL && size != 0)
  32                 perror_msg_and_die("malloc");
  33         return ptr;
  34 }
  35
  36 extern void *xrealloc(void *ptr, size_t size)
  37 {
  38         ptr = realloc(ptr, size);
  39         if (ptr == NULL && size != 0)
  40                 perror_msg_and_die("realloc");
  41         return ptr;
  42 }
  43
  44 extern void *xcalloc(size_t nmemb, size_t size)
  45 {
  46         void *ptr = calloc(nmemb, size);
  47         if (ptr == NULL && nmemb != 0 && size != 0)
  48                 perror_msg_and_die("calloc");
  49         return ptr;
  50 }
  51
  52 extern char *xstrdup(const char *s)
  53 {
  54         char *t;
  55
  56         if (s == NULL)
  57                 return NULL;
  58
  59         t = strdup(s);
  60
  61         if (t == NULL)
  62                 perror_msg_and_die("strdup");
  63
  64         return t;
  65 }
  66
  67 extern char *xstrndup(const char *s, int n)
  68 {
  69         char *t;
  70
  71         if (s == NULL)
  72                 error_msg_and_die("xstrndup bug");
  73
  74         t = xmalloc(++n);
  75
  76         return safe_strncpy(t, s, n);
  77 }
  78
  79 FILE *xfopen(const char *path, const char *mode)
  80 {
  81         FILE *fp;
  82         if ((fp = fopen(path, mode)) == NULL)
  83                 perror_msg_and_die("%s", path);
  84         return fp;
  85 }
  86
  87 /* END CODE */
  88 /*
  89 Local Variables:
  90 c-file-style: "linux"
  91 c-basic-offset: 4
  92 tab-width: 4
  93 End:
  94 */