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check for partial matches at end of dverm

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Alex Coyte
2016-11-17 09:41:23 +11:00
committed by Matthew Barr
parent 16aa22a361
commit f605ca0dc1
2 changed files with 41 additions and 28 deletions
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41
src/nfa/vermicelli.h
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@@ -74,9 +74,7 @@ const u8 *vermicelliExec(char c, char nocase, const u8 *buf,
}
buf += VERM_BOUNDARY - min;
if (buf >= buf_end) {
return buf_end;
}
assert(buf < buf_end);
}
// Aligned loops from here on in
@@ -129,9 +127,7 @@ const u8 *nvermicelliExec(char c, char nocase, const u8 *buf,
}
buf += VERM_BOUNDARY - min;
if (buf >= buf_end) {
return buf_end;
}
assert(buf < buf_end);
}
// Aligned loops from here on in
@@ -172,9 +168,7 @@ const u8 *vermicelliDoubleExec(char c1, char c2, char nocase, const u8 *buf,
}
buf += VERM_BOUNDARY - min;
if (buf >= buf_end) {
return buf_end - 1;
}
assert(buf < buf_end);
}
// Aligned loops from here on in
@@ -190,9 +184,18 @@ const u8 *vermicelliDoubleExec(char c1, char c2, char nocase, const u8 *buf,
ptr = nocase ? dvermPreconditionNocase(chars1, chars2,
buf_end - VERM_BOUNDARY)
: dvermPrecondition(chars1, chars2, buf_end - VERM_BOUNDARY);
/* buf_end - 1 to be conservative in case last byte is a partial match */
return ptr ? ptr : buf_end - 1;
if (ptr) {
return ptr;
}
/* check for partial match at end */
u8 mask = nocase ? CASE_CLEAR : 0xff;
if ((buf_end[-1] & mask) == c1) {
return buf_end - 1;
}
return buf_end;
}
static really_inline
@@ -220,9 +223,7 @@ const u8 *vermicelliDoubleMaskedExec(char c1, char c2, char m1, char m2,
}
buf += VERM_BOUNDARY - min;
if (buf >= buf_end) {
return buf_end - 1;
}
assert(buf < buf_end);
}
// Aligned loops from here on in
@@ -235,9 +236,17 @@ const u8 *vermicelliDoubleMaskedExec(char c1, char c2, char m1, char m2,
// Tidy up the mess at the end
ptr = dvermPreconditionMasked(chars1, chars2, mask1, mask2,
buf_end - VERM_BOUNDARY);
/* buf_end - 1 to be conservative in case last byte is a partial match */
return ptr ? ptr : buf_end - 1;
if (ptr) {
return ptr;
}
/* check for partial match at end */
if ((buf_end[-1] & m1) == c1) {
return buf_end - 1;
}
return buf_end;
}
// Reverse vermicelli scan. Provides exact semantics and returns (buf - 1) if