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Use exponential buffer size growth in StrAccum, as long as the size does not

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grow to large, to avoid excess memory allocation resize operations.  Also,
document the fact that setting scratch memory causes SQLite to try to avoid
large memory allocations.

FossilOrigin-Name: a518bc3318232d652349eb29303ff250aee40459
This commit is contained in:
drh
2014-11-03 14:46:29 +00:00
parent 7f5a7ecd21
commit 7b4d780b54
5 changed files with 25 additions and 17 deletions
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5
src/printf.c
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@@ -770,6 +770,11 @@ static int sqlite3StrAccumEnlarge(StrAccum *p, int N){
char *zOld = (p->zText==p->zBase ? 0 : p->zText);
i64 szNew = p->nChar;
szNew += N + 1;
if( szNew+p->nChar<=p->mxAlloc ){
/* Force exponential buffer size growth as long as it does not overflow,
** to avoid having to call this routine too often */
szNew += p->nChar;
}
if( szNew > p->mxAlloc ){
sqlite3StrAccumReset(p);
setStrAccumError(p, STRACCUM_TOOBIG);