simple string match algorithm

naive_string_match.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int string_match(char* str, char* pattern)
{
  size_t str_len = strlen(str);
  size_t pattern_len = strlen(pattern);

  size_t len_diff = str_len - pattern_len;

  int i,matched=0;

  for (i=0; i<= len_diff;)
    {
      int j=0;
      if (str[i] == pattern[j])
	{
	  for(j=1; j< pattern_len; j++)
	    {
	      if (str[i+j] != pattern[j])
		{
		  break;
		}
	      else
		{
		  if (j+1 == pattern_len)
		    {
		      matched++;
		      i+= j;
		    } 
		}
	    }
	}
    
      i++;
    }
  return matched; 
}


int main()
{
  int x = string_match("aswqsdasd", "dasd");
  printf("%d\n", x);
}