77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
|
|
* fdcat - cat reimplementation
|
|
* Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
|
|
* All Rights Reserved
|
|
*
|
|
* $Id$
|
|
*
|
|
* This program is free software. It comes without any warranty, to
|
|
* the extent permitted by applicable law. You can redistribute it
|
|
* and/or modify it under the terms of the Do What The Fuck You Want
|
|
* To Public License, Version 2, as published by Sam Hocevar. See
|
|
* http://sam.zoy.org/wtfpl/COPYING for more details.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#define _LARGEFILE64_SOURCE /* for lseek64() */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
static inline int myrand(void)
|
|
{
|
|
static int seed = 1;
|
|
int x, y;
|
|
x = (seed + 0x12345678) << 11;
|
|
y = (seed + 0xfedcba98) >> 21;
|
|
seed = x * 1010101 + y * 343434;
|
|
return seed;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
long int pos;
|
|
unsigned char *data;
|
|
int i, j, fd;
|
|
|
|
if(argc != 2)
|
|
return EXIT_FAILURE;
|
|
|
|
fd = open(argv[1], O_RDONLY);
|
|
if(fd < 0)
|
|
return EXIT_FAILURE;
|
|
|
|
pos = lseek(fd, 0, SEEK_END);
|
|
if(pos < 0)
|
|
return EXIT_FAILURE;
|
|
|
|
/* Read the whole file */
|
|
data = malloc(pos);
|
|
lseek(fd, 0, SEEK_SET);
|
|
read(fd, data, pos);
|
|
|
|
/* Read shit here and there */
|
|
for(i = 0; i < 128; i++)
|
|
{
|
|
lseek(fd, myrand() % pos, SEEK_SET);
|
|
for(j = 0; j < 16; j++)
|
|
read(fd, data + lseek(fd, 0, SEEK_CUR), myrand() % 4096);
|
|
#ifdef HAVE_LSEEK64
|
|
lseek64(fd, myrand() % pos, SEEK_SET);
|
|
for(j = 0; j < 16; j++)
|
|
read(fd, data + lseek(fd, 0, SEEK_CUR), myrand() % 4096);
|
|
#endif
|
|
}
|
|
|
|
fwrite(data, pos, 1, stdout);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|