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Fix techo handling of control and multibyte characters.

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techo compares signed char to '\x20'. Any character with code less then
'\x20' is treated as control character.  This way characters with MSB
set to 1 are considered control characters too.

Also this patch makes techo display DEL character as ^?.

To reprocuce the bug, enable echo mode using printf '\e[12l',
then type DEL character or any non-ASCII character.
This commit is contained in:
noname 2014-04-23 00:26:07 +04:00 • committed by Roberto E. Vargas Caballero
parent fa19f241a3
commit f9dc374ea0
1 changed files with 2 additions and 2 deletions
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4
st.c
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@ -2308,9 +2308,9 @@ techo(char *buf, int len) {
for(; len > 0; buf++, len--) { for(; len > 0; buf++, len--) {
char c = *buf; char c = *buf;
if(c < '\x20') { /* control code */ if(c < 0x20 || c == 0177) { /* control code */
if(c != '\n' && c != '\r' && c != '\t') { if(c != '\n' && c != '\r' && c != '\t') {
c |= '\x40'; c ^= '\x40';
tputc("^", 1); tputc("^", 1);
} }
tputc(&c, 1); tputc(&c, 1);