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#define _XOPEN_SOURCE 700
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define BUF_SIZE 4096
int
tee(int *fds, int len) {
int ret = 0;
unsigned char buf[BUF_SIZE];
ssize_t n;
while ((n = read(0, buf, BUF_SIZE)) > 0) {
int i = 0;
for (; i < len; i++) {
if (write(fds[i], buf, n) == -1) {
fprintf(stderr, "tee: write: %s\n", strerror(errno));
ret = 1;
continue;
}
}
if (write(1, buf, n) == -1) {
fprintf(stderr, "tee: write: %s\n", strerror(errno));
ret = 1;
}
}
if (n == -1) {
fprintf(stderr, "tee: read: %s\n", strerror(errno));
ret = 1;
}
return ret;
}
int
main(int argc, char **argv) {
int err = 0;
int flags = O_WRONLY | O_CREAT;
int c;
while ((c = getopt(argc, argv, "ai")) != -1) {
switch (c) {
case 'a':
flags |= O_APPEND;
break;
case 'i':
signal(SIGINT, SIG_IGN);
break;
}
}
argv += optind - 1;
int fds[argc - optind];
int i = 0;
while (*++argv) {
fds[i] = open(*argv, flags, 0644);
if (fds[i] == -1) {
fprintf(stderr, "tee: open %s: %s\n", *argv, strerror(errno));
err = 1;
i--;
continue;
}
i++;
}
if (tee(fds, i) != 0) {
err = 1;
}
while (--i > 0) {
if (close(fds[i]) == -1) {
fprintf(stderr, "tee: close: %s\n", strerror(errno));
err = 1;
}
}
return err;
}
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