From 336f26dbe1cfffd17b465084bd87d027922467da Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Wed, 19 Dec 2001 12:46:31 +0000 Subject: Add basename and dirname. Write memrchr. -Erik --- libc/string/dirname.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 libc/string/dirname.c (limited to 'libc/string/dirname.c') diff --git a/libc/string/dirname.c b/libc/string/dirname.c new file mode 100644 index 000000000..89fc31ed8 --- /dev/null +++ b/libc/string/dirname.c @@ -0,0 +1,55 @@ +/* dirname - return directory part of PATH. + Copyright (C) 1996, 2000 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 1996. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#define __USE_GNU +#include +#include + + +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') + /* The '/' is the last character, we have to look further. */ + last_slash = memrchr (path, '/', last_slash - path); + + if (last_slash != NULL) + { + /* Terminate the path. */ + if (last_slash == path) + /* The last slash is the first character in the string. We have to + return "/". */ + ++last_slash; + + 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; +} -- cgit v1.2.3