zircon/system/utest/dump1/dump1.c

// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char** argv) {
  unsigned char x;
  int fd = 0;
  if (argc == 2) {
    fd = open(argv[1], O_RDONLY);
    if (fd < 0) {
      printf("dump1: cannot open '%s'\n", argv[1]);
      return -1;
    }
  }
  for (;;) {
    int r = read(fd, &x, 1);
    if (r == 0) {
      continue;
    }
    if (r != 1) {
      break;
    }
    if (x == 'z') {
      break;
    }
    printf("%02x ", x);
    fflush(stdout);
  }
  printf("\n");
  return 0;
}