consolidate pathspec_prefix and common_prefix

The implementation from pathspec_prefix (slightly modified) replaces the
current common_prefix, because it also respects glob characters.

Based on a patch by Clemens Buchacher.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 27 deletions

diff --git a/setup.c b/setup.c
index f767d8adb1..70b887fe68 100644
--- a/setup.c
+++ b/setup.c
@@ -266,34 +266,9 @@ const char **get_pathspec(const char *prefix, const char **pathspec)
 
 char *pathspec_prefix(const char **pathspec)
 {
-	const char **p, *n, *prev;
-	unsigned long max;
+	size_t len = common_prefix_len(pathspec);
 
-	if (!pathspec)
-		return NULL;
-
-	prev = NULL;
-	max = PATH_MAX;
-	for (p = pathspec; (n = *p) != NULL; p++) {
-		int i, len = 0;
-		for (i = 0; i < max; i++) {
-			char c = n[i];
-			if (prev && prev[i] != c)
-				break;
-			if (!c || c == '*' || c == '?')
-				break;
-			if (c == '/')
-				len = i+1;
-		}
-		prev = n;
-		if (len < max) {
-			max = len;
-			if (!max)
-				break;
-		}
-	}
-
-	return max ? xmemdupz(prev, max) : NULL;
+	return len ? xmemdupz(*pathspec, len) : NULL;
 }
 
 /*