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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.
*
* $Id$
*/
#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 );
}
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