sys/boot/common/rel_open.c

   1 /*
   2  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/boot/common/rel_open.c,v 1.2 2008/09/04 17:30:52 swildner Exp $
  35  */
  36
  37 #include <stand.h>
  38 #include <string.h>
  39 #include "bootstrap.h"
  40
  41 const char *DirBase;
  42
  43 int
  44 chdir(const char *path)
  45 {
  46         struct stat st;
  47
  48         if (stat(path, &st) == 0 && S_ISDIR(st.st_mode))
  49                 DirBase = path;
  50         return 0;
  51 }
  52
  53 int
  54 rel_open(const char *path, int flags)
  55 {
  56         int fd;
  57         char *ptr;
  58
  59         if (DirBase && path[0] != '/') {
  60                 ptr = malloc(strlen(DirBase) + strlen(path) + 2);
  61                 sprintf(ptr, "%s/%s", DirBase, path);
  62                 fd = open(ptr, flags);
  63                 free(ptr);
  64         } else {
  65                 fd = open(path, flags);
  66         }
  67         return(fd);
  68 }
  69