C anagram example

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

/* Define some return codes */
#define ANAGRAM_BAD_ARGS          1
#define ANAGRAM_DIFFERENT_LENGTHS 2
#define ANAGRAM_DIFFERENT_STRINGS 4

static void SortUpperCase(char *src, char *dst, int len){
  /* Returns an upper-case sorted string */

  int i, j; /* Generic counters */
  char tmp;

  for (i = 0 ; i < len ; i++) {
    *(dst+i) = toupper(*(src+i));
  }
  *(dst+len) = '\0'; /* Need to terminate new string */

  /* Bubble sort the string */

  for (i = len-1 ; i != 0 ; i--) {
    for (j = 0 ; j < i ; j++) {
      if (*(dst+j) > *(dst+i)) {
    tmp = *(dst+i);
    *(dst+i) = *(dst+j);
    *(dst+j) = tmp;
      }
    }
  }
}

static int CheckAnagram(char *s, char *t) {
  /*
  ** Compares s and t for equivalence by converting them
  ** to UPPERCASE and then sorting them. The two string are
  ** then compared.
  */

  int slen=strlen(s), tlen=strlen(t);
  char sbuf[slen+1], tbuf[tlen+1];

  if (slen != tlen) return ANAGRAM_DIFFERENT_LENGTHS;
  SortUpperCase(s, sbuf, slen);
  SortUpperCase(t, tbuf, tlen);
  if (strcmp(sbuf, tbuf))
    return ANAGRAM_DIFFERENT_STRINGS;
  else
    return 0;
}

extern int main(int argc, char **argv) {
  /*
  ** Compares two words (given as command-line
  ** arguments) to see if they are case-independent
  ** anagrams of each other.
  **
  ** Knocked out quickly as part of Google+ discussion
  ** in the C-programming thread.
  **
  ** Tim Greening-Jackson
  ** (tim@greening-jackson.com)
  ** 27 November 2014
  */

  int status;
  if (argc == 3) {
    if (status = CheckAnagram(argv[1], argv[2])) {
      printf("'%s' and '%s' are different\n", argv[1], argv[2]);
      return status;
    }
    else {
      printf("'%s' and '%s' are anagrams\n", argv[1], argv[2]);
      return 0;
    }
  } else {
    printf("Syntax: %s <word1> <word2>\n", *argv);
    return ANAGRAM_BAD_ARGS;
  }
}