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/* stringlib: fastsearch implementation */
#define STRINGLIB_FASTSEARCH_H
/* fast search/count implementation, based on a mix between boyer-
moore and horspool, with a few more bells and whistles on the top.
for some more background, see: http://effbot.org/zone/stringlib.htm */
/* note: fastsearch may access s[n], which isn't a problem when using
Python's ordinary string types, but may cause problems if you're
using this code in other contexts. also, the count mode returns -1
if there cannot possible be a match in the target string, and 0 if
it has actually checked for matches, but didn't find any. callers
beware! */
#define FAST_COUNT 0
#define FAST_SEARCH 1
#define FAST_RSEARCH 2
#if LONG_BIT >= 128
#define STRINGLIB_BLOOM_WIDTH 128
#elif LONG_BIT >= 64
#define STRINGLIB_BLOOM_WIDTH 64
#elif LONG_BIT >= 32
#define STRINGLIB_BLOOM_WIDTH 32
#else
#error "LONG_BIT is smaller than 32"
#endif
#define STRINGLIB_BLOOM_ADD(mask, ch) \
((mask |= (1UL << ((ch) & (STRINGLIB_BLOOM_WIDTH -1)))))
#define STRINGLIB_BLOOM(mask, ch) \
((mask & (1UL << ((ch) & (STRINGLIB_BLOOM_WIDTH -1)))))
Py_LOCAL_INLINE(Py_ssize_t)
STRINGLIB(fastsearch_memchr_1char)(const STRINGLIB_CHAR* s, Py_ssize_t n,
STRINGLIB_CHAR ch, unsigned char needle,
Py_ssize_t maxcount, int mode)
{
if (mode == FAST_SEARCH) {
const STRINGLIB_CHAR *ptr = s;
const STRINGLIB_CHAR *e = s + n;
while (ptr < e) {
void *candidate = memchr((const void *) ptr, needle, (e - ptr) * sizeof(STRINGLIB_CHAR));
if (candidate == NULL)
return -1;
ptr = (const STRINGLIB_CHAR *) _Py_ALIGN_DOWN(candidate, sizeof(STRINGLIB_CHAR));
if (sizeof(STRINGLIB_CHAR) == 1 || *ptr == ch)
return (ptr - s);
/* False positive */
ptr++;
}
return -1;
}
#ifdef HAVE_MEMRCHR
/* memrchr() is a GNU extension, available since glibc 2.1.91.
it doesn't seem as optimized as memchr(), but is still quite
faster than our hand-written loop in FASTSEARCH below */
else if (mode == FAST_RSEARCH) {
while (n > 0) {
const STRINGLIB_CHAR *found;
void *candidate = memrchr((const void *) s, needle, n * sizeof(STRINGLIB_CHAR));
if (candidate == NULL)
return -1;
found = (const STRINGLIB_CHAR *) _Py_ALIGN_DOWN(candidate, sizeof(STRINGLIB_CHAR));
n = found - s;
if (sizeof(STRINGLIB_CHAR) == 1 || *found == ch)
return n;
/* False positive */
}
return -1;
}
#endif
else {
assert(0); /* Should never get here */
return 0;
}
#undef DO_MEMCHR
}
Py_LOCAL_INLINE(Py_ssize_t)
FASTSEARCH(const STRINGLIB_CHAR* s, Py_ssize_t n,
const STRINGLIB_CHAR* p, Py_ssize_t m,
Py_ssize_t maxcount, int mode)
{
unsigned long mask;
Py_ssize_t skip, count = 0;
Py_ssize_t i, j, mlast, w;
w = n - m;
if (w < 0 || (mode == FAST_COUNT && maxcount == 0))
return -1;
/* look for special cases */
if (m <= 1) {
if (m <= 0)
return -1;
/* use special case for 1-character strings */
if (n > 10 && (mode == FAST_SEARCH
#ifdef HAVE_MEMRCHR
|| mode == FAST_RSEARCH
#endif
)) {
/* use memchr if we can choose a needle without two many likely
false positives */
unsigned char needle;
needle = p[0] & 0xff;
#if STRINGLIB_SIZEOF_CHAR > 1
/* If looking for a multiple of 256, we'd have too
many false positives looking for the '\0' byte in UCS2
and UCS4 representations. */
if (needle != 0)
#endif
return STRINGLIB(fastsearch_memchr_1char)
(s, n, p[0], needle, maxcount, mode);
}
if (mode == FAST_COUNT) {
for (i = 0; i < n; i++)
if (s[i] == p[0]) {
count++;
if (count == maxcount)
return maxcount;
}
return count;
} else if (mode == FAST_SEARCH) {
for (i = 0; i < n; i++)
if (s[i] == p[0])
return i;
} else { /* FAST_RSEARCH */
for (i = n - 1; i > -1; i--)
if (s[i] == p[0])
return i;
}
return -1;
}
mlast = m - 1;
skip = mlast - 1;
mask = 0;
if (mode != FAST_RSEARCH) {
/* create compressed boyer-moore delta 1 table */
/* process pattern[:-1] */
for (i = 0; i < mlast; i++) {
STRINGLIB_BLOOM_ADD(mask, p[i]);
if (p[i] == p[mlast])
skip = mlast - i - 1;
}
/* process pattern[-1] outside the loop */
STRINGLIB_BLOOM_ADD(mask, p[mlast]);
for (i = 0; i <= w; i++) {
/* note: using mlast in the skip path slows things down on x86 */
if (s[i+m-1] == p[m-1]) {
/* candidate match */
for (j = 0; j < mlast; j++)
if (s[i+j] != p[j])
break;
if (j == mlast) {
/* got a match! */
if (mode != FAST_COUNT)
return i;
count++;
if (count == maxcount)
return maxcount;
i = i + mlast;
continue;
}
/* miss: check if next character is part of pattern */
if (!STRINGLIB_BLOOM(mask, s[i+m]))
i = i + m;
else
i = i + skip;
} else {
/* skip: check if next character is part of pattern */
if (!STRINGLIB_BLOOM(mask, s[i+m]))
i = i + m;
}
}
} else { /* FAST_RSEARCH */
/* create compressed boyer-moore delta 1 table */
/* process pattern[0] outside the loop */
STRINGLIB_BLOOM_ADD(mask, p[0]);
/* process pattern[:0:-1] */
for (i = mlast; i > 0; i--) {
STRINGLIB_BLOOM_ADD(mask, p[i]);
if (p[i] == p[0])
skip = i - 1;
}
for (i = w; i >= 0; i--) {
if (s[i] == p[0]) {
/* candidate match */
for (j = mlast; j > 0; j--)
if (s[i+j] != p[j])
break;
if (j == 0)
/* got a match! */
return i;
/* miss: check if previous character is part of pattern */
if (i > 0 && !STRINGLIB_BLOOM(mask, s[i-1]))
i = i - m;
else
i = i - skip;
} else {
/* skip: check if previous character is part of pattern */
if (i > 0 && !STRINGLIB_BLOOM(mask, s[i-1]))
i = i - m;
}
}
}
if (mode != FAST_COUNT)
return -1;
return count;
}
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