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| author | Russ Cox <rsc@swtch.com> | 2014-12-01 20:15:52 -0500 |
|---|---|---|
| committer | Russ Cox <rsc@swtch.com> | 2014-12-02 01:18:40 +0000 |
| commit | fff818fe878ca5edfbac85b15e77ada2acb8ea0f (patch) | |
| tree | 1c528d7e620547fa26704577af3330188154ba46 /src/cmd | |
| parent | d3a47e14e5ebf7a4d8ca8c9a3dfe748b93d3663a (diff) | |
| download | plan9port-fff818fe878ca5edfbac85b15e77ada2acb8ea0f.tar.gz plan9port-fff818fe878ca5edfbac85b15e77ada2acb8ea0f.tar.bz2 plan9port-fff818fe878ca5edfbac85b15e77ada2acb8ea0f.zip | |
libdraw, libframe, acme: fix, guard against inverted range in textsetselect
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>
Diffstat (limited to 'src/cmd')
| -rw-r--r-- | src/cmd/acme/text.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/cmd/acme/text.c b/src/cmd/acme/text.c index c537d277..7634d921 100644 --- a/src/cmd/acme/text.c +++ b/src/cmd/acme/text.c @@ -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 */ |