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libdraw: fix agefont crash when display == nil (from sources / agefont-nodisplay patch)

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If you run this:
	{for (i in `{seq 1 70000}) echo '½•α·'} | mc | wc
mc will eventually suicide. The error comes from
/sys/src/libdraw/font.c:/^agefont which assumes it has a
display. Normally, this is set up by geninitdraw (usually
via initdraw), but mc.c avoids that to avoid the screen
redraws (flicker, at a minimum, but worse in long-running
cases).

graphics(2) does not prohibit this use, so I made the least
intrusive change to make it work.
This commit is contained in:
cinap_lenrek 2013-05-25 04:36:16 +02:00
parent 96511b274d
commit cf657b418b
1 changed files with 1 additions and 1 deletions
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2
sys/src/libdraw/font.c
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@ -129,7 +129,7 @@ agefont(Font *f)
if(s->age){
if(s->age<SUBFAGE && s->cf->name != nil){
/* clean up */
if(s->f != display->defaultsubfont)
if(display == nil || s->f != display->defaultsubfont)
freesubfont(s->f);
s->cf = nil;
s->f = nil;