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Fix string buffer COW handling.

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Reported by XmiliaH.
This commit is contained in:
Mike Pall 2022-03-07 09:42:59 +01:00
parent 1d7b5029c5
commit c4adf49204
1 changed files with 1 additions and 1 deletions
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2
src/lj_buf.c
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@ -66,7 +66,7 @@ LJ_NOINLINE char *LJ_FASTCALL lj_buf_more2(SBuf *sb, MSize sz)
lj_err_mem(sbufL(sbx));
if (len + sz > sbufsz(sbx)) { /* Must grow. */
buf_grow((SBuf *)sbx, len + sz);
} else if (sbufxslack(sbx) < (sbufsz(sbx) >> 3)) {
} else if (sbufiscow(sb) || sbufxslack(sbx) < (sbufsz(sbx) >> 3)) {
/* Also grow to avoid excessive compactions, if slack < size/8. */
buf_grow((SBuf *)sbx, sbuflen(sbx) + sz); /* Not sbufxlen! */
return sbx->w;