surfaces-unies/src/main.c

#include "utilities.h"
#include <getopt.h>

#define NOERROR 0
#define ARGERROR 1

void help(int exit_code) {
  puts("Usage:");
  puts("surfaces-unies -i path [-o path] [-options]\n");
  puts("The default action is to compress the mandatory input image to a .sf");
  puts("file saved in the current directory.");
  puts("The input image MUST be saved in the ppm format.");
  puts("Options available:");
  puts("-h --help\n\tdisplay the current message");
  puts("-i --input\n\tpath to the input file (MANDATORY)");
  puts("-o --output");
  puts("\tpath to the output file (if the file already exists, it will be\n");
  puts("-c --compress\n\tcompress the input file");
  puts("-u --uncompress\n\tuncompresses the input file to the output file.");
  exit(exit_code);
}

struct Argres {
  char *input;
  char *output;
  bool compress;
};
typedef struct Argres Argres;

void get_args(Argres *args, int *c) {
  switch (*c) {
  case 0:   break;
  case 'h': help(NOERROR); break;
  case 'i': (*args).input = optarg;   break;
  case 'o': (*args).output = optarg;  break;
  case 'c': (*args).compress = true;  break;
  case 'u': (*args).compress = false; break;
  case '?':
  default: help(ARGERROR);
  }
}

Argres process_args(int t_argc, char *t_argv[]) {
  Argres res;
  res.input = NULL;
  res.output = NULL;
  while (true) {
    int option_index = 0;
    static struct option long_options[] = {
        {"help", no_argument, NULL, 'h'},         {"input", required_argument, NULL, 'i'},
        {"output", required_argument, NULL, 'o'}, {"compress", no_argument, NULL, 'c'},
        {"uncompress", no_argument, NULL, 'u'},   {NULL, 0, NULL, 0}};
    int c = getopt_long(t_argc, t_argv, "hi:o:cu", long_options, &option_index);
    if (c == -1) break;
    get_args(&res, &c);
  }
  return res;
}

int main(int argc, char **argv) {
  Argres argresults = process_args(argc, argv);
  if (argresults.input) {
    printf("input: %s\n", argresults.input);
  } else {
    fprintf(stderr, "ERROR: no input file.");
    help(ARGERROR);
  }
  if (!argresults.output) {
    argresults.output = "output.fs";
  }
  printf("output: %s\n", argresults.output);
  printf("Compress? %s\n", (argresults.compress) ? "true" : "false");
  return 0;
}