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[query_sixel] tighten sixel check state machine #1523

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nick black 2021-04-12 02:02:59 -04:00
parent 96ca5e79cb
commit 430e328df6
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GPG Key ID: 5F43400C21CBFACC
1 changed files with 15 additions and 7 deletions
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22
src/lib/terminfo.c
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@ -347,14 +347,16 @@ query_sixel(tinfo* ti, int fd){
// return, both suggesting a VT102. alacritty's miraculous technicolor VT102
// can display sixel, but real VT102s can even reply to XTSMGRAPHICS, so we
// detect VT102 + TERM including alacritty, and special-case that.
// FIXME need unit tests on this
enum {
WANT_CSI,
WANT_QMARK,
WANT_SEMI,
WANT_C,
WANT_C4, // want '4' to indicate sixel or 'c' to terminate
WANT_VT102_C,
DONE
} state = WANT_CSI;
bool in4 = false; // set true after seeing ";4", clear on semi
// we're looking for a 4 following a semicolon
while(state != DONE && read(fd, &in, 1) == 1){
switch(state){
@ -370,12 +372,17 @@ query_sixel(tinfo* ti, int fd){
break;
case WANT_SEMI:
if(in == ';'){
state = WANT_C;
if(in4){
setup_sixel(ti);
query = true;
}
state = WANT_C4;
}else if(in == 'c'){
state = DONE;
}else if(in == '6'){
state = WANT_VT102_C;
}
in4 = false;
break;
case WANT_VT102_C:
if(in == 'c'){
@ -384,16 +391,17 @@ query_sixel(tinfo* ti, int fd){
}
state = DONE;
}else if(in == ';'){
state = WANT_C;
state = WANT_C4;
}
break;
case WANT_C:
case WANT_C4:
if(in == 'c'){
state = DONE;
}else if(in == '4'){
setup_sixel(ti);
query = true;
state = DONE;
in4 = true;
state = WANT_SEMI;
}else{
in4 = false;
}
break;
case DONE: