[RFC PATCH v2 11/12] dir: move is_empty_file() from builtin/am.c to dir.c and make it public

[Antonio Ospite <ao2@ao2.it>]

The is_empty_file() function can be generally useful, move it to dir.c
and make it public.

Signed-off-by: Antonio Ospite <ao2@ao2.it>
---
 builtin/am.c | 15 ---------------
 dir.c        | 16 ++++++++++++++++
 dir.h        |  1 +
 3 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 6273ea5195..0c04312a50 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -33,21 +33,6 @@
 #include "string-list.h"
 #include "packfile.h"
 
-/**
- * Returns 1 if the file is empty or does not exist, 0 otherwise.
- */
-static int is_empty_file(const char *filename)
-{
-	struct stat st;
-
-	if (stat(filename, &st) < 0) {
-		if (errno == ENOENT)
-			return 1;
-		die_errno(_("could not stat %s"), filename);
-	}
-
-	return !st.st_size;
-}
 
 /**
  * Returns the length of the first line of msg.
diff --git a/dir.c b/dir.c
index 21e6f2520a..c1f7b90256 100644
--- a/dir.c
+++ b/dir.c
@@ -2412,6 +2412,22 @@ int is_empty_dir(const char *path)
 	return ret;
 }
 
+/**
+ * Returns 1 if the file is empty or does not exist, 0 otherwise.
+ */
+int is_empty_file(const char *filename)
+{
+	struct stat st;
+
+	if (stat(filename, &st) < 0) {
+		if (errno == ENOENT)
+			return 1;
+		die_errno(_("could not stat %s"), filename);
+	}
+
+	return !st.st_size;
+}
+
 static int remove_dir_recurse(struct strbuf *path, int flag, int *kept_up)
 {
 	DIR *dir;
diff --git a/dir.h b/dir.h
index f5fdedbab2..e45aa3f459 100644
--- a/dir.h
+++ b/dir.h
@@ -281,6 +281,7 @@ static inline int is_dot_or_dotdot(const char *name)
 }
 
 extern int is_empty_dir(const char *dir);
+extern int is_empty_file(const char *filename);
 
 extern void setup_standard_excludes(struct dir_struct *dir);
 
-- 
2.18.0