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Adjust lastIndex to leading surrogate when inside a surrogate pair in unicode RegExp (initial patch by auvred)

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Fabrice Bellard
2025-08-25 17:54:19 +02:00
parent d9ec8f102e
commit a4ac84d993
2 changed files with 28 additions and 1 deletions
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12
libregexp.c
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@@ -3163,6 +3163,7 @@ int lre_exec(uint8_t **capture,
REExecContext s_s, *s = &s_s;
int re_flags, i, alloca_size, ret;
StackInt *stack_buf;
const uint8_t *cptr;
re_flags = lre_get_flags(bc_buf);
s->is_unicode = (re_flags & (LRE_FLAG_UNICODE | LRE_FLAG_UNICODE_SETS)) != 0;
@@ -3187,8 +3188,17 @@ int lre_exec(uint8_t **capture,
capture[i] = NULL;
alloca_size = s->stack_size_max * sizeof(stack_buf[0]);
stack_buf = alloca(alloca_size);
cptr = cbuf + (cindex << cbuf_type);
if (0 < cindex && cindex < clen && s->is_unicode) {
const uint16_t *p = (const uint16_t *)cptr;
if (is_lo_surrogate(*p) && is_hi_surrogate(p[-1])) {
cptr = (const uint8_t *)(p - 1);
}
}
ret = lre_exec_backtrack(s, capture, stack_buf, 0, bc_buf + RE_HEADER_LEN,
cbuf + (cindex << cbuf_type), FALSE);
cptr, FALSE);
lre_realloc(s->opaque, s->state_stack, 0);
return ret;
}