netbyte.c

// The MIT License (MIT)

// Copyright (c) 2014 Rob Paisley

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char **argv)
{
  unsigned int a = 0;
  int b = 0;
  char c;
  int i;
  char *fmt = "%5s: %10u %11d\n";

  if(2 > argc) {
    fprintf(stderr, "Usage: %s <number to parse> [...]\n", *argv);
    return EXIT_FAILURE;
  }

  printf("%17s %11s\n", "unsigned", "signed");
  for(i = 1; i < argc; i += 1) {
    if(1 != sscanf(argv[i], "%u%c", &a, &c)) {
      fprintf(stderr, "Unable to scan %s as unsigned int\n", argv[i]);
    }
    if(1 != sscanf(argv[i], "%d%c", &b, &c)) {
      fprintf(stderr, "Unable to scan %s as int\n", argv[i]);
    }

    printf(fmt, "orig", a, b);
    printf(fmt, "ntohl", ntohl(a), ntohl(b));
    printf(fmt, "htonl", htonl(a), htonl(b));
  }

  return EXIT_SUCCESS;
}
// vim:sw=2: