/* SPDX-License-Identifier: BSD-2-Clause */

/**
 *  @file
 *
 *  A test support function which performs a crude version of
 *  "cat" so you can look at specific parts of a file.
 */

/*
 *  COPYRIGHT (c) 1989-2012.
 *  On-Line Applications Research Corporation (OAR).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>

#include <tmacros.h>

/* forward declarations to avoid warnings */
void test_cat(char *file, int offset_arg, int length);

/*
 *  test_cat routine
 */

unsigned char test_cat_buffer[ 1024 ];

void test_cat(
  char *file,
  int   offset_arg,
  int   length
)
{
  int            fd;
  int            status;
  int            is_printable = 0;
  int            my_length;
  int            i;
  unsigned char  c;
  int            count = 0;
  off_t          offset = (off_t)offset_arg;

  my_length = (length) ? length : sizeof( test_cat_buffer );
  rtems_test_assert( my_length <= sizeof( test_cat_buffer ) );

  fd = open( file, O_RDONLY );
  if ( fd == -1 ) {
    printf( "test_cat: open( %s ) failed : %s\n", file, strerror( errno ) );
    rtems_test_exit( 0 );
  }

  for ( ;; ) {
    status = lseek( fd, offset, SEEK_SET );
    rtems_test_assert( status != -1 );

    status = read( fd, test_cat_buffer, sizeof(test_cat_buffer) );
    if ( status <= 0 ) {
      if (!is_printable)
        printf( "(%d)", count );
      puts( "" );
      break;
    }

    for ( i=0 ; i<status ; i++ ) {
      c = test_cat_buffer[i];
      if (isprint(c) || isspace(c)) {
        if (!is_printable) {
          printf( "(%d)", count );
          count = 0;
          is_printable = 1;
        }
        putchar(c);
      } else {
        is_printable = 0;
        count++;
      }
    }
    offset += status;
  }

  status = close( fd );
  rtems_test_assert( !status );
}