/*                                       GOLDFISH CLUB  example program */

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

#define MAX_NUM_ENTRIES 500
#define MAX_LINE_LENGTH 99

char database[MAX_NUM_ENTRIES][MAX_LINE_LENGTH];
int num_entries=0;

void read_data(char *filename);   /* prototypes because our compiler whines too much    */
void print_data(void);

void main(int argc, char *argv[])
{ char *filename=NULL, *progname;
  int i;
  progname=argv[0];               /* program name (= command typed) always comes first     */
  for (i=1; i<argc; i+=1)         /* scan the command line arguments                       */
  { if (strcmp(argv[i],"-h")==0)     /* -h means want help                                 */
    { printf("To use this program, enter the command:\n");
      printf("    %s filename\n", progname);
      printf("where filename is the name of the database-containing text file, or:\n");
      printf("    %s\n", progname);
      printf("to use keyboard input instead\n");
      exit(0); }
    else
      filename=argv[i]; }            /* anything else must be the file name.               */
                              /* if no filename provided, the variable filename will still */
                              /* be NULL. read_data is built to detect that and use stdin. */
  read_data(filename);
  print_data(); }

void read_data(char *filename)
{ FILE *f;
  if (filename==NULL)
    f=stdin;
  else
  { f=fopen(filename,"r");
    if (f==NULL)
    { printf("** Can't read \"%s\"\n", filename);
      exit(1); } }
  while (1)
  { char *t;
    int len;
    if (num_entries>=MAX_NUM_ENTRIES)
    { printf("** File Too Long! Buy The Upgrade!!! **\n");
      exit(1); }
    t=fgets(database[num_entries], MAX_LINE_LENGTH, f);
    if (t==NULL) break;
    len=strlen(database[num_entries]);
    database[num_entries][len-1]=0;
    num_entries+=1; }
  fclose(f);
  printf("[%d entries read]\n", num_entries); }

void print_data(void)
{ int i;
  printf("[%d entries]\n", num_entries);
  for (i=0; i<num_entries; i+=1)
  { printf("%6d: \"%s\"\n", i, database[i]); } }