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sam: fix off-by-one in buffer merge.

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exposed by UTFmax==4

R=rsc
http://codereview.appspot.com/165071
This commit is contained in:
Russ Cox 2009-12-06 17:27:08 -08:00
parent 1d919bc080
commit 846cec9ebc
1 changed files with 2 additions and 2 deletions
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4
src/cmd/sam/file.c
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@ -139,7 +139,7 @@ loginsert(File *f, uint p0, Rune *s, uint ns)
if(merge.f != f
|| p0-(merge.p0+merge.n)>Maxmerge /* too far */
|| merge.nbuf+((p0+ns)-(merge.p0+merge.n))>RBUFSIZE) /* too long */
|| merge.nbuf+((p0+ns)-(merge.p0+merge.n))>=RBUFSIZE) /* too long */
flushmerge();
if(ns>=RBUFSIZE){
@ -178,7 +178,7 @@ logdelete(File *f, uint p0, uint p1)
if(merge.f != f
|| p0-(merge.p0+merge.n)>Maxmerge /* too far */
|| merge.nbuf+(p0-(merge.p0+merge.n))>RBUFSIZE){ /* too long */
|| merge.nbuf+(p0-(merge.p0+merge.n))>=RBUFSIZE){ /* too long */
flushmerge();
merge.f = f;
merge.p0 = p0;