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tee.c
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C/C++ Source or Header
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1990-07-19
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/* tee - pipe fitting Author: Paul Polderman */
#include <sys/types.h>
#include <fcntl.h>
#include <blocksize.h>
#include <signal.h>
#include <unistd.h>
#define MAXFD 18
int fd[MAXFD];
main(argc, argv)
int argc;
char **argv;
{
char iflag = 0, aflag = 0;
char buf[BLOCK_SIZE];
int i, s, n;
argv++;
--argc;
while (argc > 0 && argv[0][0] == '-') {
switch (argv[0][1]) {
case 'i': /* Interrupt turned off. */
iflag++;
break;
case 'a': /* Append to outputfile(s), instead of
* overwriting them. */
aflag++;
break;
default:
std_err("Usage: tee [-i] [-a] [files].\n");
exit(1);
}
argv++;
--argc;
}
fd[0] = 1; /* Always output to stdout. */
for (s = 1; s < MAXFD && argc > 0; --argc, argv++, s++) {
if (aflag && (fd[s] = open(*argv, O_RDWR)) >= 0) {
lseek(fd[s], 0L, SEEK_END);
continue;
} else {
if ((fd[s] = creat(*argv, 0666)) >= 0) continue;
}
std_err("Cannot open output file: ");
std_err(*argv);
std_err("\n");
exit(2);
}
if (iflag) signal(SIGINT, SIG_IGN);
while ((n = read(0, buf, BLOCK_SIZE)) > 0) {
for (i = 0; i < s; i++) write(fd[i], buf, n);
}
for (i = 0; i < s; i++) /* Close all fd's */
close(fd[i]);
exit(0);
}