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libdraw, libframe, acme: fix, guard against inverted range in textsetselect

Browse source 
Credit to Roi Martin <jroi.martin@gmail.com> for noticing that
libdraw was being passed a negative string length and for finding the
sequence of keystrokes that make acme do it reproducibly.

Change-Id: If3f3d04a25c506175f740d3e887d5d83b5cd1bfe
Reviewed-on: https://plan9port-review.googlesource.com/1092
Reviewed-by: Russ Cox <rsc@swtch.com>
This commit is contained in:
Russ Cox 2014-12-01 20:15:52 -05:00
parent d3a47e14e5
commit fff818fe87
3 changed files with 15 additions and 3 deletions
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12
src/cmd/acme/text.c
View file

@ -819,8 +819,12 @@ texttype(Text *t, Rune r)
nr = runestrlen(rp);
break; /* fall through to normal insertion case */
case 0x1B:
if(t->eq0 != ~0)
textsetselect(t, t->eq0, t->q0);
if(t->eq0 != ~0) {
if(t->eq0 <= t->q0)
textsetselect(t, t->eq0, t->q0);
else
textsetselect(t, t->q0, t->eq0);
}
if(t->ncache > 0)
typecommit(t);
t->iq1 = t->q0;
@ -1173,7 +1177,7 @@ void
textsetselect(Text *t, uint q0, uint q1)
{
int p0, p1, ticked;
/* t->fr.p0 and t->fr.p1 are always right; t->q0 and t->q1 may be off */
t->q0 = q0;
t->q1 = q1;
@ -1198,6 +1202,8 @@ textsetselect(Text *t, uint q0, uint q1)
frtick(&t->fr, frptofchar(&t->fr, p0), ticked);
return;
}
if(p0 > p1)
sysfatal("acme: textsetselect p0=%d p1=%d q0=%ud q1=%ud t->org=%d nchars=%d", p0, p1, q0, q1, (int)t->org, (int)t->fr.nchars);
/* screen disagrees with desired selection */
if(t->fr.p1<=p0 || p1<=t->fr.p0 || p0==p1 || t->fr.p1==t->fr.p0){
/* no overlap or too easy to bother trying */

3
src/libdraw/string.c
View file

@ -67,6 +67,9 @@ _string(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, Rune *r, i
Font *def;
Subfont *sf;
if(len < 0)
sysfatal("libdraw: _string len=%d", len);
if(s == nil){
s = "";
sptr = nil;

3
src/libframe/frdraw.c
View file

@ -62,6 +62,9 @@ frdrawsel0(Frame *f, Point pt, ulong p0, ulong p1, Image *back, Image *text)
Point qt;
uint p;
char *ptr;
if(p0 > p1)
sysfatal("libframe: frdrawsel0 p0=%lud > p1=%lud", p0, p1);
p = 0;
b = f->box;