/*
 * C version by Wessel Dankers <wsl@fruit.eu.org>
 *
 * This code is in the public domain.
 *
 */

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

void print_usage (const char *progname)
{
  fprintf (stderr, "Command line usage: %s [flags] -- prefix [recipients]\n",
           progname);
  exit (1);
}

int main (int argc, char **argv)
{
  char **opts, **opt, *pfx;
  int i;

  if (argc <= 1) {
    print_usage (argv[0]);
  }

  opts = malloc ((2 * argc + 1) * sizeof (*opts));      /* __MEM_CHECKED__ */
  if (!opts) {
    perror (argv[0]);
    exit (2);
  }

  if (argc < 2) {
    fprintf (stderr,
             "Command line usage: %s [flags] -- prefix [recipients]\n",
             argv[0]);
    return 1;
  }

  opt = opts;
  *opt++ = argv[1];
  pfx = NULL;

  for (i = 2; i < argc;) {
    if (!strcmp (argv[i], "--")) {
      i += 2;
      if (i > argc) {
        print_usage (argv[0]);
      }
      pfx = argv[i - 1];
    }
    if (pfx)
      *opt++ = pfx;
    *opt++ = argv[i++];
  }
  *opt = NULL;

  execvp (opts[0], opts);
  perror (argv[0]);
  return 2;
}