keyline() and keyfield() operations

[overonion] / reverse.c

#include "reverse_lib.h"

#include <err.h>
#include <stdio.h>
#include <string.h>
#include <sysexits.h>

int main(int argc, char** argv) {
  if (argc == 1 || (argc == 2 && strcmp(argv[1], "-") == 0)) {
    reverse_stream(stdin, stdout);
  } else if (argc == 2) {
    reverse_file(argv[1], stdout);
  } else {
    errx(EX_USAGE, "Usage: reverse filename");
  }
  return 0;
}