src/system/libroot/posix/stdlib/realpath.cpp

   1 /*
   2  * Copyright 2013, Olivier Coursière, olivier.coursiere@laposte.net.
   3  * Copyright 2009, Axel Dörfler, axeld@pinc-software.de.
   4  * Distributed under the terms of the MIT License.
   5  */
   6
   7
   8 #include <stdlib.h>
   9
  10 #include <errno.h>
  11 #include <sys/stat.h>
  12
  13 #include <errno_private.h>
  14 #include <syscalls.h>
  15
  16
  17 char*
  18 realpath(const char* path, char* resolved)
  19 {
  20         char* resolvedPath = resolved;
  21
  22         if (resolvedPath == NULL) {
  23                 resolvedPath = (char*)malloc(PATH_MAX + 1);
  24                 if (resolvedPath == NULL) {
  25                         __set_errno(B_NO_MEMORY);
  26                         return NULL;
  27                 }
  28         }
  29
  30         status_t status = _kern_normalize_path(path, true, resolvedPath);
  31         if (status != B_OK) {
  32                 __set_errno(status);
  33                 if (resolved == NULL)
  34                         free(resolvedPath);
  35                 return NULL;
  36         }
  37
  38         // The path must actually exist, not just its parent directories
  39         struct stat stat;
  40         if (lstat(resolvedPath, &stat) != 0) {
  41                 if (resolved == NULL)
  42                         free(resolvedPath);
  43                 return NULL;
  44         }
  45
  46         return resolvedPath;
  47 }