#include<stdio.h>

#include<string.h>

    

    

char *my_strstr(const char *src, const char *needle, unsigned int len){

unsigned int i = 0;

unsigned char *p = NULL, *pc = NULL;


printf("+++string:%s+++needle:%s+++len:%d+++\n", src, needle, len);

pc = needle;

for(p = src; *p; p++){

while(*pc){

if(*p == *pc){

pc++;

i++;

p++;

if(i == len){

return p - len;

}

}else{

p -= i;

i = 0;

pc = needle;

break;

}

}

}



return 0;

}


int main(int argc, char *argv[]){

if(argc<3){

printf("arguements error!\n");

return -1;

}

unsigned int len = strlen(argv[2]);

char *needle = my_strstr(argv[1], argv[2], len);

if(needle != NULL){

printf("needle=%s\n", needle);

}

return 0;

}