sbase/tee.c

/* See LICENSE file for copyright and license details. */
#include <signal.h>
#include <stdio.h>

#include "util.h"

static void
usage(void)
{
	eprintf("usage: %s [-ai] [file ...]\n", argv0);
}

int
main(int argc, char *argv[])
{
	FILE **fps = NULL;
	size_t i, n, nfps;
	int aflag = 0, iflag = 0;
	char buf[BUFSIZ];

	ARGBEGIN {
	case 'a':
		aflag = 1;
		break;
	case 'i':
		iflag = 1;
		break;
	default:
		usage();
	} ARGEND;

	if (iflag && signal(SIGINT, SIG_IGN) == SIG_ERR)
		eprintf("signal:");
	nfps = argc + 1;
	fps = ecalloc(nfps, sizeof(*fps));

	for (i = 0; i < argc; i++)
		if (!(fps[i] = fopen(argv[i], aflag ? "a" : "w")))
			eprintf("fopen %s:", argv[i]);
	fps[i] = stdout;

	while ((n = fread(buf, 1, sizeof(buf), stdin))) {
		for (i = 0; i < nfps; i++) {
			if (fwrite(buf, 1, n, fps[i]) == n)
				continue;
			eprintf("fwrite %s:", (i != argc) ? argv[i] : "<stdout>");
		}
	}
	if (ferror(stdin))
		eprintf("fread <stdin>:");

	return 0;
}