Add a safe wrapper for write and fix some warnings

1. Add a function writeall and make swrite wrap that function. Use either writeall or swrite, depending on whether we want to exit on errors or not.
2. Fix warnings when compiling with a higher optimisation level.
(CFLAGS ?= -pipe -O3 -march=native -mtune=native -freorder-blocks-and-partition)

Signed-off-by: hwangcc <hwangcc@csie.nctu.edu.tw>

1 files changed, 3 insertions, 1 deletions

diff --git a/i3-nagbar/main.c b/i3-nagbar/main.c
index b501ff6a..91de317f 100644
--- a/i3-nagbar/main.c
+++ b/i3-nagbar/main.c
@@ -164,7 +164,9 @@ static void handle_button_release(xcb_connection_t *conn, xcb_button_release_eve
     char *link_path;
     char *exe_path = get_exe_path(argv0);
     sasprintf(&link_path, "%s.nagbar_cmd", script_path);
-    symlink(exe_path, link_path);
+    if (symlink(exe_path, link_path) == -1) {
+        err(EXIT_FAILURE, "Failed to symlink %s to %s", link_path, exe_path);
+    }
 
     char *terminal_cmd;
     sasprintf(&terminal_cmd, "i3-sensible-terminal -e %s", link_path);