Add git__dirname and git__basename utility routines

These routines are intended to extract the directory and
base name from a path string. Note that these routines
do not interact with any filesystem and work only on the
text of the path.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
index 80829e69e..3184a3abd 100644
--- a/src/util.c
+++ b/src/util.c
@@ -59,3 +59,65 @@ int git__suffixcmp(const char *str, const char *suffix)
 		return -1;
 	return strcmp(str + (a - b), suffix);
 }
+
+int git__dirname(char *dir, size_t n, char *path)
+{
+	char *s;
+	int  len;
+
+	assert(dir && n > 1);
+
+	if (!path || !*path || !(s = strrchr(path, '/'))) {
+		strcpy(dir, ".");
+		return 1;
+	}
+
+	if (s == path) { /* "/[aaa]" */
+		strcpy(dir, "/");
+		return 1;
+	}
+
+	if ((len = s - path) >= n)
+		return GIT_ERROR;
+
+	memcpy(dir, path, len);
+	dir[len] = '\0';
+
+	return len;
+}
+
+int git__basename(char *base, size_t n, char *path)
+{
+	char *s;
+	int  len;
+
+	assert(base && n > 1);
+
+	if (!path || !*path) {
+		strcpy(base, ".");
+		return 1;
+	}
+	len = strlen(path);
+
+	if (!(s = strrchr(path, '/'))) {
+		if (len >= n)
+			return GIT_ERROR;
+		strcpy(base, path);
+		return len;
+	}
+
+	if (s == path && len == 1) { /* "/" */
+		strcpy(base, "/");
+		return 1;
+	}
+
+	len -= s - path;
+	if (len >= n)
+		return GIT_ERROR;
+
+	memcpy(base, s+1, len);
+	base[len] = '\0';
+
+	return len;
+}
+