[PATCH v5 2/3] path: add a find_basename() portability function

[David Aguilar <davvid@gmail.com>]

find_basename() is a simpler version of basename().
It maintains constness and thus does not require you
to pass in a copy.  It is only concerned with finding
the last directory separator in a string and returning
a pointer.

This function was written because Windows does not
have basename().  It is called "find_basename()"
to avoid name collisions and to provide a hint that
it is not quite the same thing as POSIX basename().

Signed-off-by: David Aguilar <davvid@gmail.com>
---

As suggested by Peff.

 cache.h |    1 +
 path.c  |   14 ++++++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/cache.h b/cache.h
index b8503ad..08b6f42 100644
--- a/cache.h
+++ b/cache.h
@@ -640,6 +640,7 @@ static inline int is_absolute_path(const char *path)
 	return path[0] == '/' || has_dos_drive_prefix(path);
 }
 int is_directory(const char *);
+const char *find_basename(const char *path);
 const char *make_absolute_path(const char *path);
 const char *make_nonrelative_path(const char *path);
 const char *make_relative_path(const char *abs, const char *base);
diff --git a/path.c b/path.c
index 8a0a674..7a2fe14 100644
--- a/path.c
+++ b/path.c
@@ -358,6 +358,20 @@ int set_shared_perm(const char *path, int mode)
 	return 0;
 }
 
+/* return the basename of a path */
+const char *find_basename(const char *path)
+{
+	const char *basename = path + strlen(path) - 1;
+	while(*basename && basename > path) {
+		basename--;
+		if (is_dir_sep(*basename)) {
+			basename++;
+			break;
+		}
+	}
+	return basename;
+}
+
 const char *make_relative_path(const char *abs, const char *base)
 {
 	static char buf[PATH_MAX + 1];
-- 
1.6.3.1.178.g4daa97