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authorEric Andersen <andersen@codepoet.org>2001-12-19 12:46:31 +0000
committerEric Andersen <andersen@codepoet.org>2001-12-19 12:46:31 +0000
commit336f26dbe1cfffd17b465084bd87d027922467da (patch)
treecd8fdc5722fe099a0ac7e596221595062489a162 /libc/string/dirname.c
parentbf126cb24e809f36067ce43f9186cbe53b906cad (diff)
Add basename and dirname. Write memrchr.
-Erik
Diffstat (limited to 'libc/string/dirname.c')
-rw-r--r--libc/string/dirname.c55
1 files changed, 55 insertions, 0 deletions
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 <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 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 <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')
+ /* 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;
+}