compatibility: replace iscntrl with own ISCNTRL macro

It is unspecified if the C locale iscntrl is compatible with ASCII or not.

Noticed when testing on OpenBSD 3.8 which uses extended ASCII and also uses the
C1 range for control-characters.  This breaks support with UTF-8.

Reference:
https://en.wikipedia.org/wiki/C0_and_C1_control_codes#C1_control_codes_for_general_use
C1 table.

Force an own definition of an ASCII-compatible control-character range since
sfeed expects input to be UTF-8 (or converted from iconv) and so output to be
UTF-8 aswell.

1 files changed, 1 insertions, 1 deletions

diff --git a/sfeed_web.c b/sfeed_web.c
index 704afe8..dfff0a3 100644
--- a/sfeed_web.c
+++ b/sfeed_web.c
@@ -16,7 +16,7 @@ static void
 printvalue(const char *s)
 {
 	for (; *s; s++)
-		if (!iscntrl((unsigned char)*s))
+		if (!ISCNTRL((unsigned char)*s))
 			putchar(*s);
 }