/* dirname - return directory part of PATH. Copyright (C) 1996, 2000, 2001, 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <libgen.h> #include <string.h> char * dirname (char *path) { static const char dot[] = "."; char *last_slash; /* Find last '/'. */ last_slash = path != NULL ? strrchr (path, '/') : NULL; if (last_slash != NULL && last_slash != path && last_slash[1] == '\0') { /* Determine whether all remaining characters are slashes. */ char *runp; for (runp = last_slash; runp != path; --runp) if (runp[-1] != '/') break; /* The '/' is the last character, we have to look further. */ if (runp != path) last_slash = __memrchr (path, '/', runp - path); } if (last_slash != NULL) { /* Determine whether all remaining characters are slashes. */ char *runp; for (runp = last_slash; runp != path; --runp) if (runp[-1] != '/') break; /* Terminate the path. */ if (runp == path) { /* The last slash is the first character in the string. We have to return "/". As a special case we have to return "//" if there are exactly two slashes at the beginning of the string. See XBD 4.10 Path Name Resolution for more information. */ if (last_slash == path + 1) ++last_slash; else last_slash = path + 1; } else last_slash = runp; 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; }