dirname.c

Solaris操作系统下的过滤驱动程序, C源码程序.

/*
 * Copyright (c) 1997-2003 Erez Zadok
 * Copyright (c) 2001-2003 Stony Brook University
 * Copyright (c) 1997-2000 Columbia University
 *
 * For specific licensing information, see the COPYING file distributed with
 * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
 *
 * This Copyright notice must be kept intact and distributed with all
 * fistgen sources INCLUDING sources generated by fistgen.
 */

/* replacement function from glibc */
char *
dirname(char *path)
{
  static const char dot[] = ".";
  char *last_slash;

  /* Find last '/'.  */
  last_slash = path != NULL ? strrchr (path, '/') : NULL;

  if (last_slash == path)
    /* The last slash is the first character in the string.  We have to
       return "/".  */
    ++last_slash;
  else if (last_slash != NULL && last_slash[1] == '\0')
    /* The '/' is the last character, we have to look further.  */
    last_slash = memchr (path, last_slash - path, '/');

  if (last_slash != NULL)
    /* Terminate the path.  */
    last_slash[0] = '\0';
  else
    /* This assignment is ill-designed but the XPG specs require to
       return a string containing "." in any case no directory part is
       found and so a static and constant string is required.  */
    path = (char *) dot;

  return path;
}