common/replacements/realpath.c

   1 /* nbdkit
   2  * Copyright Red Hat
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /* Replacement for realpath for platforms which lack this function. */
  34
  35 #include <config.h>
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <stdarg.h>
  40
  41 #ifndef HAVE_REALPATH
  42
  43 #include "realpath.h"
  44
  45 #ifdef WIN32
  46
  47 /* Replacement realpath for Win32.
  48  *
  49  * Note this is not thread-safe, but should be fine for all the
  50  * uses in the server and ordinary plugins.
  51  */
  52
  53 #include <windows.h>
  54
  55 char *
  56 realpath (const char *path, char *out)
  57 {
  58   TCHAR buf[MAX_PATH];
  59   int r;
  60
  61   r = GetFullPathNameA (path, MAX_PATH, buf, NULL);
  62   if (r == 0) {
  63     errno = GetLastError ();
  64     return NULL;
  65   }
  66
  67   out = malloc (r + 1);
  68   if (out == NULL)
  69     return NULL;
  70   memcpy (out, buf, r);
  71   out[r] = '\0';
  72
  73   return out;
  74 }
  75
  76 #else /* !WIN32 */
  77 #error "no replacement realpath is available on this platform"
  78 #endif
  79
  80 #endif /* !HAVE_REALPATH */