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/*

 *  A test support function which performs a crude version of

 *  "cat" so you can look at specific parts of a file.

 *

 *  $Id: test_cat.c,v 1.2 2001-09-27 12:02:25 chris Exp $

 */

#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 <assert.h>

/*

 *  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 );

  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 ) );

    exit( 0 );

  }

  for ( ;; ) {

    status = lseek( fd, offset, SEEK_SET );

    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 );

  assert( !status );

}