StdLib: Add directory access functions to PosixLib.

[mirror_edk2.git] / StdLib / PosixLib / Gen / dirname.c

/** @file\r
\r
 * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.\r
 * All rights reserved.\r
 *\r
 * This code is derived from software contributed to The NetBSD Foundation\r
 * by Klaus Klein and Jason R. Thorpe.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS\r
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED\r
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR\r
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS\r
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\r
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\r
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\r
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\r
 * POSSIBILITY OF SUCH DAMAGE.\r
\r
    NetBSD: dirname.c,v 1.10 2008/05/10 22:39:40 christos Exp\r
 */\r
#include  <LibConfig.h>\r
\r
#include <sys/cdefs.h>\r
\r
//#include "namespace.h"\r
//#include <libgen.h>\r
#include <limits.h>\r
#include <string.h>\r
\r
#ifdef __weak_alias\r
__weak_alias(dirname,_dirname)\r
#endif\r
\r
#if !HAVE_DIRNAME\r
char *\r
dirname(char *path)\r
{\r
  static char singledot[] = ".";\r
  static char result[PATH_MAX];\r
  const char *lastp;\r
  size_t len;\r
\r
  /*\r
   * If `path' is a null pointer or points to an empty string,\r
   * return a pointer to the string ".".\r
   */\r
  if ((path == NULL) || (*path == '\0'))\r
    return (singledot);\r
\r
  /* Strip trailing slashes, if any. */\r
  lastp = path + strlen(path) - 1;\r
  while (lastp != path && *lastp == '/')\r
    lastp--;\r
\r
  /* Terminate path at the last occurence of '/'. */\r
  do {\r
    if (*lastp == '/') {\r
      /* Strip trailing slashes, if any. */\r
      while (lastp != path && *lastp == '/')\r
        lastp--;\r
\r
      /* ...and copy the result into the result buffer. */\r
      len = (lastp - path) + 1 /* last char */;\r
      if (len > (PATH_MAX - 1))\r
        len = PATH_MAX - 1;\r
\r
      memcpy(result, path, len);\r
      result[len] = '\0';\r
\r
      return (result);\r
    }\r
  } while (--lastp >= path);\r
\r
  /* No /'s found, return a pointer to the string ".". */\r
  return (singledot);\r
}\r
#endif\r