1 files changed, 100 insertions, 0 deletions
diff --git a/coreutils/tee.c b/coreutils/tee.c
new file mode 100644
index 0000000..640a231
--- /dev/null
+++ b/coreutils/tee.c
@@ -0,0 +1,100 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * tee implementation for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
+
+#include "busybox.h"
+#include <signal.h>
+
+int tee_main(int argc, char **argv)
+{
+	const char *mode = "w\0a";
+	FILE **files;
+	FILE **fp;
+	char **names;
+	char **np;
+	int flags;
+	int retval = EXIT_SUCCESS;
+#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
+	ssize_t c;
+# define buf bb_common_bufsiz1
+#else
+	int c;
+#endif
+	flags = getopt32(argc, argv, "ia");	/* 'a' must be 2nd */
+	argc -= optind;
+	argv += optind;
+
+	mode += (flags & 2);	/* Since 'a' is the 2nd option... */
+
+	if (flags & 1) {
+		signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */
+	}
+	/* gnu tee ignores SIGPIPE in case one of the output files is a pipe
+	 * that doesn't consume all its input.  Good idea... */
+	signal(SIGPIPE, SIG_IGN);	/* TODO - switch to sigaction. */
+
+	/* Allocate an array of FILE *'s, with one extra for a sentinal. */
+	fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
+	np = names = argv - 1;
+
+	files[0] = stdout;
+	goto GOT_NEW_FILE;
+	do {
+		*fp = fopen_or_warn(*argv, mode);
+		if (*fp == NULL) {
+			retval = EXIT_FAILURE;
+			continue;
+		}
+		*np = *argv++;
+ GOT_NEW_FILE:
+		setbuf(*fp++, NULL);	/* tee must not buffer output. */
+		np++;
+	} while (*argv);
+	/* names[0] will be filled later */
+
+#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
+	while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
+		fp = files;
+		do
+			fwrite(buf, 1, c, *fp++);
+		while (*fp);
+	}
+	if (c < 0) {		/* Make sure read errors are signaled. */
+		retval = EXIT_FAILURE;
+	}
+#else
+	setvbuf(stdout, NULL, _IONBF, 0);
+	while ((c = getchar()) != EOF) {
+		fp = files;
+		do
+			putc(c, *fp++);
+		while (*fp);
+	}
+#endif
+
+	/* Now we need to check for i/o errors on stdin and the various
+	 * output files.  Since we know that the first entry in the output
+	 * file table is stdout, we can save one "if ferror" test by
+	 * setting the first entry to stdin and checking stdout error
+	 * status with fflush_stdout_and_exit()... although fflush()ing
+	 * is unnecessary here. */
+	np = names;
+	fp = files;
+	names[0] = (char *) bb_msg_standard_input;
+	files[0] = stdin;
+	do {	/* Now check for input and output errors. */
+		/* Checking ferror should be sufficient, but we may want to fclose.
+		 * If we do, remember not to close stdin! */
+		die_if_ferror(*fp++, *np++);
+	} while (*fp);
+
+	fflush_stdout_and_exit(retval);
+}