#include <string.h>
-#include <stdlib.h>
#include <stdint.h>
static char *twobyte_strstr(const unsigned char *h, const unsigned char *n)
static char *threebyte_strstr(const unsigned char *h, const unsigned char *n)
{
- uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8;
- uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8;
+ uint32_t nw = (uint32_t)n[0]<<24 | n[1]<<16 | n[2]<<8;
+ uint32_t hw = (uint32_t)h[0]<<24 | h[1]<<16 | h[2]<<8;
for (h+=2; *h && hw != nw; hw = (hw|*++h)<<8);
return *h ? (char *)h-2 : 0;
}
static char *fourbyte_strstr(const unsigned char *h, const unsigned char *n)
{
- uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8 | n[3];
- uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8 | h[3];
+ uint32_t nw = (uint32_t)n[0]<<24 | n[1]<<16 | n[2]<<8 | n[3];
+ uint32_t hw = (uint32_t)h[0]<<24 | h[1]<<16 | h[2]<<8 | h[3];
for (h+=3; *h && hw != nw; hw = hw<<8 | *++h);
return *h ? (char *)h-3 : 0;
}
-#if 0
-static char *naive_strstr(const char *h, const char *n)
-{
- size_t i;
- for (i=0; n[i] && h[i]; i++)
- for ( ; n[i] != h[i]; h++, i=0);
- return n[i] ? 0 : (char *)h;
-}
-#endif
-
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)<(b)?(a):(b))
for (;;) {
/* Update incremental end-of-haystack pointer */
if (z-h < l) {
- /* Fast estimate for MIN(l,63) */
+ /* Fast estimate for MAX(l,63) */
size_t grow = l | 63;
- const char *z2 = memchr(z, 0, grow);
+ const unsigned char *z2 = memchr(z, 0, grow);
if (z2) {
z = z2;
if (z-h < l) return 0;
/* Check last byte first; advance by shift on mismatch */
if (BITOP(byteset, h[l-1], &)) {
k = l-shift[h[l-1]];
- //printf("adv by %zu (on %c) at [%s] (%zu;l=%zu)\n", k, h[l-1], h, shift[h[l-1]], l);
if (k) {
- if (mem0 && mem && k < p) k = l-p;
+ if (k < mem) k = mem;
h += k;
mem = 0;
continue;
}
/* Compare left half */
for (k=ms+1; k>mem && n[k-1] == h[k-1]; k--);
- if (k == mem) return (char *)h;
+ if (k <= mem) return (char *)h;
h += p;
mem = mem0;
}
h = strchr(h, *n);
if (!h || !n[1]) return (char *)h;
if (!h[1]) return 0;
- if (!n[2]) return twobyte_strstr(h, n);
+ if (!n[2]) return twobyte_strstr((void *)h, (void *)n);
if (!h[2]) return 0;
- if (!n[3]) return threebyte_strstr(h, n);
+ if (!n[3]) return threebyte_strstr((void *)h, (void *)n);
if (!h[3]) return 0;
- if (!n[4]) return fourbyte_strstr(h, n);
+ if (!n[4]) return fourbyte_strstr((void *)h, (void *)n);
- return twoway_strstr(h, n);
+ return twoway_strstr((void *)h, (void *)n);
}