Thread: user input verification

So, I'm seeing if i can (re)learn programming as a more useful way to spend my time then watch tv.
That said I'm trying to make a card game but I have problem with my input verification function:

Code:

int checknames(char *str,int op) {
/*in progress...*/
  int i,j,test,resp=0;
  char faces[]="aAkKqQjJtT23456789";
  char suits[]="sShHcCdD";
  for (i=0;i<strsize(str)-op;i++) {
      test=0;
      if (i%3 == 0)
          for (j=0;faces[j];j++) 
              if (*(str+i) == faces[j]) {
                  test=1;
                  break;
                }
      if (i%3 == 1)
          for (j=0;suits[j];j++)
              if (*(str+i) == suits[j]) {
                  test=1;
                  break;
                }
      if (i%3 == 2)
          if (*(str+i) == ' ') {
              test=1;
              break;
            }
      if (!test) {
          resp=1;
          break;
        }
      }
  return resp;
}

The idea to verify that the input is in the correct form (that being 'As 5h 6c' for example) and return 1 if the verification fails (the op int is there to tell the function to ignore (or not) the last char of the string and will be either 0 or 1).

So, what I was trying to accomplish was: check if the 1st char is a "face", check if the 2nd char is a "suit", check if there is a ' ' next, repeat until the end of the string (except \0 and sometimes the 1 before), return 1 if it fails or 0 if it passes.

If you could detect what i did wrong (or give any advise in general) i would appreciate it.