code-style: various cleanups (#356)

* run_key_handler: make the logic easier to follow
* remove timeout_t
  the typedef is not needed. inline the declaration similar to the other
  static structs.
* simplify estrdup
  reuse emalloc, instead of calling malloc and null-checking.
* win_clear: initialize `e` right away
* process_bindings: explicitly check against NULL
  most pointer checks in the codebase do explicit check.
* use a named constant instead of magic number
  also changes the padding from 3 to 4 bytes according to [0]. but i
  couldn't find any situtation where this mattered, so perhaps the current
  padding is enough. but doesn't hurt adding one more byte.

[0]: https://nullprogram.com/blog/2017/10/06/

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/356
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>

1 files changed, 16 insertions, 20 deletions

diff --git a/main.c b/main.c
index 12cf404..02128a7 100644
--- a/main.c
+++ b/main.c
@@ -51,12 +51,6 @@
 }
 
 typedef struct {
-	struct timeval when;
-	bool active;
-	timeout_f handler;
-} timeout_t;
-
-typedef struct {
 	int err;
 	char *cmd;
 } extcmd_t;
@@ -98,12 +92,16 @@ static struct {
 
 bool title_dirty;
 
-static timeout_t timeouts[] = {
-	{ { 0, 0 }, false, redraw       },
-	{ { 0, 0 }, false, reset_cursor },
-	{ { 0, 0 }, false, slideshow    },
-	{ { 0, 0 }, false, animate      },
-	{ { 0, 0 }, false, clear_resize },
+static struct {
+	timeout_f handler;
+	struct timeval when;
+	bool active;
+} timeouts[] = {
+	{ redraw       },
+	{ reset_cursor },
+	{ slideshow    },
+	{ animate      },
+	{ clear_resize },
 };
 
 /**************************
@@ -611,14 +609,12 @@ static bool run_key_handler(const char *key, unsigned int mask)
 	/* drop user input events that occurred while running the key handler */
 	while (XCheckIfEvent(win.env.dpy, &dump, is_input_ev, NULL));
 
-	if (mode == MODE_IMAGE) {
-		if (changed) {
-			img_close(&img, true);
-			load_image(fileidx);
-		}
-	}
-	if (mode == MODE_THUMB || !changed)
+	if (mode == MODE_IMAGE && changed) {
+		img_close(&img, true);
+		load_image(fileidx);
+	} else {
 		open_info();
+	}
 	free(oldst);
 	reset_cursor();
 	return true;
@@ -633,7 +629,7 @@ static bool process_bindings(const keymap_t *bindings, unsigned int len, KeySym
 	for (i = 0; i < len; i++) {
 		if (bindings[i].ksym_or_button == ksym_or_button &&
 		    MODMASK(bindings[i].mask | implicit_mod) == MODMASK(state) &&
-		    bindings[i].cmd.func &&
+		    bindings[i].cmd.func != NULL &&
 		    (bindings[i].cmd.mode == MODE_ALL || bindings[i].cmd.mode == mode))
 		{
 			if (bindings[i].cmd.func(bindings[i].arg))