崩溃的C程序

Question

I am trying to write an algorithm that searches a document for a particular chunk. If the chunk is found, a 1 will be returned, if not, a 0. Basically if the chunk is "abcd" and a particular length is 2, the chunk would be split into "ab" and "cd." Then search the document to see if either "ab" or "cd" is there. I think my algorithm is pretty much fine, but the program keeps crashing. I think it has to do with the strncmp, but I can't figure out how to fix it.

Here's my code:

int main( )
{
         char s1[] = "abcdef";
         char s3[] = "cd";
         size_t s1Size = strlen(s1);
         int k = 2;

         if(simple_substr_match(s3,k,s1,s1Size))
            printf("Match Found\n");
         else
            printf("No Match Found\n");
         return 0;  
}

int simple_substr_match(const unsigned char *ps, int k, const unsigned char *ts, int n)
{
        int isMatch; 
        int i;
        int j; 

        for(i=0;i<n;i++)
        {
           if(strncmp(ts[i], ps, k))
           {
              isMatch = 1; 
           }
        }

        return isMatch; 

}

Answer 1

strcmp will comapre the strings

use strstr(buffer, s1) != null

http://en.cppreference.com/w/c/string/byte/strstr

Answer 2

use : if(strncmp(&ts[i], ps, k)) or if(strncmp(ts+i, ps, k))

pay attention to warnings. By using ts[i] you are derefing and comparing with value which is a char. strncmp needs an address [ with proper memory ofcourse ]