pastebin - collaborative debugging

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

int main( int argn, char *argv[] ) {
  int matrix[256][256];
  int total[256];
  int first, next, last;
  int l, m;

  first = last = fgetc(stdin);

  for (l = 0; l < 256; l++) {
    total[l] = 0;

    for (m = 0; m < 256; m++)
      matrix[l][m] = 0;
  }

  while ((next = fgetc(stdin)) != EOF) {
    matrix[last][next]++;
    total[last]++;
    last = next;
  }


  srandom(time(NULL));

  last = first;
  putchar(first);
  for (l = 0; l < 10000; l++) {
    if (total[last] <= 0) {
      printf("\n\t**Unexpected ending!\n");
      break;
    }
    int r = random()%total[last] + 1;
    next = 0;
    while (1) {
      r -= matrix[last][next];
      if (r <= 0)
        break;
      next++;
    }

    putchar(next);
    last = next;
  }

  putchar('\n');
}