[PATCH v2 08/21] setup.c: refactor path manipulation out of read_gitfile()

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 setup.c | 44 ++++++++++++++++++++++++--------------------
 1 file changed, 24 insertions(+), 20 deletions(-)

diff --git a/setup.c b/setup.c
index 5432a31..c040981 100644
--- a/setup.c
+++ b/setup.c
@@ -278,15 +278,31 @@ static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
 	return 0;
 }
 
+static char *path_from_gitfile(const char *path, const char *buf, int len)
+{
+	const char *slash;
+	if (len < 1)
+		die("No path in gitfile: %s", path);
+
+	if (!is_absolute_path(buf) && (slash = strrchr(path, '/'))) {
+		size_t pathlen = slash+1 - path;
+		size_t dirlen = pathlen + len;
+		char *p = xmalloc(dirlen + 1);
+		strncpy(p, path, pathlen);
+		strncpy(p + pathlen, buf, len);
+		p[dirlen] = '\0';
+		return p;
+	} else
+		return xmemdupz(buf, len);
+}
+
 /*
  * Try to read the location of the git directory from the .git file,
  * return path to git directory if found.
  */
 const char *read_gitfile(const char *path)
 {
-	char *buf;
-	char *dir;
-	const char *slash;
+	char *buf, *dir;
 	struct stat st;
 	int fd;
 	ssize_t len;
@@ -303,31 +319,19 @@ const char *read_gitfile(const char *path)
 	close(fd);
 	if (len != st.st_size)
 		die("Error reading %s", path);
-	buf[len] = '\0';
-	if (prefixcmp(buf, "gitdir: "))
-		die("Invalid gitfile format: %s", path);
-	while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
+	while (len > 0 && (buf[len - 1] == '\n' || buf[len - 1] == '\r'))
 		len--;
-	if (len < 9)
-		die("No path in gitfile: %s", path);
 	buf[len] = '\0';
-	dir = buf + 8;
 
-	if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
-		size_t pathlen = slash+1 - path;
-		size_t dirlen = pathlen + len - 8;
-		dir = xmalloc(dirlen + 1);
-		strncpy(dir, path, pathlen);
-		strncpy(dir + pathlen, buf + 8, len - 8);
-		dir[dirlen] = '\0';
-		free(buf);
-		buf = dir;
-	}
+	if (prefixcmp(buf, "gitdir: "))
+		die("Invalid gitfile format: %s", path);
+	dir = path_from_gitfile(path, buf + 8, len - 8);
 
 	if (!is_git_directory(dir))
 		die("Not a git repository: %s", dir);
 	path = real_path(dir);
 
+	free(dir);
 	free(buf);
 	return path;
 }
-- 
1.8.5.1.77.g42c48fa