copy.h

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/*
Copyright 2010-2020 Pierre SMARS (smars@yuntech.edu.tw)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#define BLOCK_SIZE 256
char buffer[BLOCK_SIZE];
ssize_t n;
while((n=fread(buffer, sizeof(char), BLOCK_SIZE,stdin)))
    fwrite(buffer, sizeof(char), n, stdout);