common/file-helpers.c: share file_exists() to reduce duplication

include/common/file-helpers.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef LABWC_FILE_HELPERS_H
+#define LABWC_FILE_HELPERS_H
+#include <stdbool.h>
+
+/**
+ * file_exists() - Test if file exists.
+ * @filename: Name of file to test.
+ */
+bool file_exists(const char *filename);
+
+#endif /* LABWC_FILE_HELPERS_H */

src/button/button-png.c

@@ -8,22 +8,14 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/stat.h>
 #include <wlr/util/log.h>
 #include "buffer.h"
 #include "button/button-png.h"
 #include "button/common.h"
+#include "common/file-helpers.h"
 #include "labwc.h"
 #include "theme.h"
 
-/* Share with session.c:isfile() */
-static bool
-file_exists(const char *path)
-{
-	struct stat st;
-	return (!stat(path, &st));
-}
-
 /*
  * cairo_image_surface_create_from_png() does not gracefully handle non-png
  * files, so we verify the header before trying to read the rest of the file.

src/common/file-helpers.c

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <sys/stat.h>
+#include "common/file-helpers.h"
+
+bool
+file_exists(const char *filename)
+{
+	struct stat st;
+	return (!stat(filename, &st));
+}

src/common/meson.build

@@ -2,6 +2,7 @@ labwc_sources += files(
   'buf.c',
   'dir.c',
   'fd_util.c',
+  'file-helpers.c',
   'font.c',
   'grab-file.c',
   'graphic-helpers.c',

src/config/session.c

@@ -8,18 +8,12 @@
 #include <sys/stat.h>
 #include <wlr/util/log.h>
 #include "common/buf.h"
+#include "common/file-helpers.h"
 #include "common/mem.h"
 #include "common/spawn.h"
 #include "common/string-helpers.h"
 #include "config/session.h"
 
-static bool
-isfile(const char *path)
-{
-	struct stat st;
-	return (!stat(path, &st));
-}
-
 static bool
 string_empty(const char *s)
 {
@@ -130,7 +124,7 @@ session_autostart_init(const char *dir)
 	if (!autostart) {
 		return;
 	}
-	if (!isfile(autostart)) {
+	if (!file_exists(autostart)) {
 		wlr_log(WLR_ERROR, "no autostart file");
 		goto out;
 	}