Kmp linux源码实现

voidkmp_init(const char *patn, int len, int *next)

{

int i, j;

next[0] = 0;

for (i = 1, j = 0; i < len; i ++) {

while (j > 0 && patn[j] != patn[i])

j = next[j - 1];

if (patn[j] == patn[i])

j ++;

next[i] = j;

}

}

intkmp_find(const char *text, int text_len, const char *patn,

int patn_len, int *next)

{

int i, j;

for (i = 0, j = 0; i < text_len; i ++ ) {

while (j > 0 && text[i] != patn[j])

j = next[j - 1];

if (text[i] == patn[j])

j ++;

if (j == patn_len)

return i + 1 - patn_len;

}

return -1;

}