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#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
int
main (int argc, char *argv[])
{
int fds[argc-1];
char buf[argc-1][4096];
int i;
int max_ret, ret;
if (argc < 2) {
printf ("Usage: %s file1 file2 ... >file\n", argv[0]);
return 1;
}
for (i=0; i<argc-1; i++) {
fds[i] = open (argv[i+1], O_RDONLY);
if (fds[i] == -1) {
perror (argv[i+1]);
return 1;
}
}
max_ret = 0;
do {
char newbuf[4096] = {0, };
int j;
max_ret = 0;
for (i=0; i<argc-1; i++) {
memset (buf[i], 0, 4096);
ret = read (fds[i], buf[i], 4096);
if (ret > max_ret)
max_ret = ret;
}
for (i=0; i<max_ret;i++)
for (j=0; j<argc-1; j++)
newbuf[i] |= buf[j][i];
write (1, newbuf, max_ret);
} while (max_ret);
return 0;
}
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