/* acro.c */

/*
  QUICK INSTALL JUST TO TRY IT OUT
  Compile:
    gcc acro.c -o acro
  Then, try:
    ./acro DVD DVI CD
  and you get
    CD   Compact Disc
    DVI  ?
    DVD  Digital Versatile Disc
  Note:
    This solution uses recursion which is not common in C.
    Also, a professional solution would use SQL (or at least XML).
    (Data should not be hard coded but put in a separate file.)
  News:
    There is in fact an XML, and a web/MySQL, version of this
    application on my home page:
      http://user.it.uu.se/~embe8573
  
  COMPLETE INSTALL IF YOU REALLY LIKE IT
    1. Compile as above to get the binary executable
    2. Put that file in a folder listed when you type `echo $PATH`
    3. In the same folder as this (acro.c) file, find acro.1.gz
    4. Move that file to /usr/share/man/man1/
       (Note: Although an archive, view the groff code in Emacs like
              any other file.)
*/

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

const int EXIT_FAIL = 1;
const int EXIT_OK = 0;
const int EQ_STR = 0;

int main(int argc, char** argv) {
  if (argc == 1) {
    fprintf(stderr, "Usage: acro needs at least one argument.\n");
    return EXIT_FAIL;
  }
  else {
    int argument_index = argc - 1;
    char *str_acro = malloc(strlen(argv[argument_index]));
    strcpy(str_acro, argv[argument_index]);
    printf("%s\t", str_acro);
    if (strcmp(str_acro, "CD") == EQ_STR)
      { printf("Compact Disc"); }
    else if (strcmp(str_acro, "DVD") == EQ_STR)
      { printf("Digital Versatile Disc"); }
    else { printf("?", str_acro); }
    putchar('\n');
    free(str_acro);
    if (argc != 2) { main(--argc, argv); }
  }
  return EXIT_OK;
}