C > Gnu-Linux

Appending two files

Appending two files

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc, char **argv) {
 char buf[1024];
 int n, in, out;

 if(argc != 3) {
  fprintf(stderr, "Usage: append SOURCE TARGET\n");
  return 0;
 }

 /* open the first file for reading */
 in = open(argv[1], O_RDONLY);
 /* the second file for writing */
 out = open(argv[2], O_WRONLY|O_APPEND);

 /* copy data from the first file to the second file */
 while((n = read(in, buf, sizeof(buf))) > 0)
  write(out, buf, n);

 return 0;
}