tiny code-style and typo-fix in comment

st.c

@@ -38,7 +38,7 @@
 
 /* macros */
 #define IS_SET(flag)		((term.mode & (flag)) != 0)
-#define ISCONTROLC0(c)		(BETWEEN(c, 0, 0x1f) || (c) == '\177')
+#define ISCONTROLC0(c)		(BETWEEN(c, 0, 0x1f) || (c) == 0x7f)
 #define ISCONTROLC1(c)		(BETWEEN(c, 0x80, 0x9f))
 #define ISCONTROL(c)		(ISCONTROLC0(c) || ISCONTROLC1(c))
 #define ISDELIM(u)		(u && wcschr(worddelimiters, u))
@@ -2307,7 +2307,7 @@ tputc(Rune u)
 	Glyph *gp;
 
 	control = ISCONTROL(u);
-	if (!IS_SET(MODE_UTF8) && !IS_SET(MODE_SIXEL)) {
+	if (!IS_SET(MODE_UTF8 | MODE_SIXEL)) {
 		c[0] = u;
 		width = len = 1;
 	} else {

x.c

@@ -1927,7 +1927,7 @@ run(void)
 		 * triggers drawing, we first wait a bit to ensure we got
 		 * everything, and if nothing new arrives - we draw.
 		 * We start with trying to wait minlatency ms. If more content
-		 * arrives sooner, we retry with shorter and shorter preiods,
+		 * arrives sooner, we retry with shorter and shorter periods,
 		 * and eventually draw even without idle after maxlatency ms.
 		 * Typically this results in low latency while interacting,
 		 * maximum latency intervals during `cat huge.txt`, and perfect