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
  29 extern void *xmalloc(size_t size)
  30 {
  31         void *ptr = malloc(size);
  32         if (ptr == NULL && size != 0)
  33                 perror_msg_and_die("malloc");
  34         return ptr;
  35 }
  36
  37 extern void *xrealloc(void *ptr, size_t size)
  38 {
  39         ptr = realloc(ptr, size);
  40         if (ptr == NULL && size != 0)
  41                 perror_msg_and_die("realloc");
  42         return ptr;
  43 }
  44
  45 extern void *xcalloc(size_t nmemb, size_t size)
  46 {
  47         void *ptr = calloc(nmemb, size);
  48         if (ptr == NULL && nmemb != 0 && size != 0)
  49                 perror_msg_and_die("calloc");
  50         return ptr;
  51 }
  52
  53 extern char * xstrdup (const char *s) {
  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         char *t;
  69
  70         if (s == NULL)
  71                 error_msg_and_die("xstrndup bug");
  72
  73         t = xmalloc(++n);
  74
  75         return safe_strncpy(t,s,n);
  76 }
  77
  78 FILE *xfopen(const char *path, const char *mode)
  79 {
  80         FILE *fp;
  81         if ((fp = fopen(path, mode)) == NULL)
  82                 perror_msg_and_die("%s", path);
  83         return fp;
  84 }
  85
  86 /* END CODE */
  87 /*
  88 Local Variables:
  89 c-file-style: "linux"
  90 c-basic-offset: 4
  91 tab-width: 4
  92 End:
  93 */