commit 8342036f983288046e03a34055c10fc6b6b11017
from: Roberto E. Vargas Caballero <k0ga@shike2.com>
date: Tue Aug 19 10:57:44 2014 UTC

Fix definition of CONTROLC0

DEL character is not thecnically talking a C0 control character,
although it has some common properties with them, so it is useful
for us consider it as C0. Before this patch DEL (\177), was not
ignored as it ought to be.

commit - 9d9e049eac3dacb2725f9d792f7cdd2230062313
commit + 8342036f983288046e03a34055c10fc6b6b11017
blob - 0e228a7a6b1132f41145a2e75571aaad361e7d10
blob + 1c998ec65f37f948475a39022c39f0899eff8452
--- st.c
+++ st.c
@@ -70,7 +70,7 @@ char *argv0;
 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
-#define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
+#define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)