#include<stdio.h>
/* {{{ php_similar_str
*/
static void php_similar_str(const char *txt1, int len1, const char *txt2, int len2, int *pos1, int *pos2, int *max)
{
char *p, *q;
char *end1 = (char *) txt1 + len1;
char *end2 = (char *) txt2 + len2;
int l;
*max = 0;
for (p = (char *) txt1; p < end1; p++) {
for (q = (char *) txt2; q < end2; q++) {
for (l = 0; (p + l < end1) && (q + l < end2) && (p[l] == q[l]); l++);
if (l > *max) {
*max = l;
*pos1 = p - txt1;
*pos2 = q - txt2;
}
}
}
}
/* }}} */
/* {{{ php_similar_char
*/
static int php_similar_char(const char *txt1, int len1, const char *txt2, int len2)
{
int sum;
int pos1, pos2, max;
php_similar_str(txt1, len1, txt2, len2, &pos1, &pos2, &max);
if ((sum = max)) {
if (pos1 && pos2) {
printf("txt here %s,%s\n", txt1, txt2);
sum += php_similar_char(txt1, pos1,
txt2, pos2);
}
if ((pos1 + max < len1) && (pos2 + max < len2)) {
printf("txt here %s,%s\n", txt1+ pos1 + max, txt2+ pos2 + max);
sum += php_similar_char(txt1 + pos1 + max, len1 - pos1 - max,
txt2 + pos2 + max, len2 - pos2 - max);
}
}
return sum;
}
/* }}} */
int main(void)
{
printf("Found %d similar chars\n",
php_similar_char("PHP IS GREAT", 12, "WITH MYSQL", 10));
printf("Found %d similar chars\n",
php_similar_char("WITH MYSQL", 10,"PHP IS GREAT", 12));
return 0;
}