printf: Format the empty string for %l of non-links

It makes a difference if the format specifier has a width.

2 files changed, 15 insertions, 9 deletions

diff --git a/printf.c b/printf.c
index 6eb59dd..a8cb8f0 100644
--- a/printf.c
+++ b/printf.c
@@ -306,20 +306,21 @@ static int bfs_printf_k(FILE *file, const struct bfs_printf *directive, const st
 
 /** %l: link target */
 static int bfs_printf_l(FILE *file, const struct bfs_printf *directive, const struct BFTW *ftwbuf) {
-	if (ftwbuf->type != BFTW_LNK) {
-		return 0;
-	}
+	char *buf = NULL;
+	const char *target = "";
 
-	const struct bfs_stat *statbuf = bftw_cached_stat(ftwbuf, BFS_STAT_NOFOLLOW);
-	size_t len = statbuf ? statbuf->size : 0;
+	if (ftwbuf->type == BFTW_LNK) {
+		const struct bfs_stat *statbuf = bftw_cached_stat(ftwbuf, BFS_STAT_NOFOLLOW);
+		size_t len = statbuf ? statbuf->size : 0;
 
-	char *target = xreadlinkat(ftwbuf->at_fd, ftwbuf->at_path, len);
-	if (!target) {
-		return -1;
+		target = buf = xreadlinkat(ftwbuf->at_fd, ftwbuf->at_path, len);
+		if (!target) {
+			return -1;
+		}
 	}
 
 	int ret = fprintf(file, directive->str, target);
-	free(target);
+	free(buf);
 	return ret;
 }
 
diff --git a/tests.sh b/tests.sh
index bbc823d..7276672 100755
--- a/tests.sh
+++ b/tests.sh
@@ -528,6 +528,7 @@ gnu_tests=(
     test_printf_Y_error
     test_printf_H
     test_printf_u_g_ulimit
+    test_printf_l_nonlink
 
     test_quit
     test_quit_child
@@ -1990,6 +1991,10 @@ function test_printf_u_g_ulimit() {
     [ "$(invoke_bfs deep -printf '%u %g\n' | uniq)" = "$(id -un) $(id -gn)" ]
 }
 
+function test_printf_l_nonlink() {
+    bfs_diff links -printf '| %24p -> %-24l |\n'
+}
+
 function test_fstype() {
     fstype="$(invoke_bfs basic -maxdepth 0 -printf '%F\n')"
     bfs_diff basic -fstype "$fstype"