letter counts per paragraph

Count up the number of each letter by paragraph.

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

int main(int numArgs, char** args)
{
  const int lineSize = 10000;

  if (numArgs != 2) {
    fprintf(stderr, "Usage: par_char_freq <text file>\n");
    exit(1);
  }
  else {
    char* line = malloc(lineSize);
    FILE* in = fopen(args[1], "r");
    int counts[26];
    int paragraphTotal = 0;

    if (!in) {
      fprintf(stderr, "Problem opening %s\n", args[1]);
      perror("");
      exit(1);
    }

    bzero(counts, 26 * sizeof(int));

    while (!feof(in) && !ferror(in)) {
      int lineTotal = 0;
      if (fgets(line, lineSize, in)) {
 int i;
 for (i = 0; line[i]; ++i) {
   const char c = tolower(line[i]);
   if ('a' <= c && c <= 'z') {
     ++counts[c - 'a'];
     ++lineTotal;
   }
 }
 
 if (lineTotal) {
   paragraphTotal += lineTotal;
 }
 else if (paragraphTotal) {
   int i;
   for (i = 0; i < 26; ++i) {
     printf("%d ", counts[i]);
   }
   printf("\n");

   paragraphTotal = 0;
   bzero(counts, 26 * sizeof(int));
 }
      }
    }

    fclose(in);
    free(line);
  }
  return 0;
}