1 files changed, 120 insertions, 0 deletions
diff --git a/busybox/coreutils/tee.c b/busybox/coreutils/tee.c
new file mode 100644
index 0000000..ba2e10f
--- /dev/null
+++ b/busybox/coreutils/tee.c
@@ -0,0 +1,120 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * tee implementation for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+#include "busybox.h"
+
+int tee_main(int argc, char **argv)
+{
+	const char *mode = "w\0a";
+	FILE **files;
+	FILE **p;
+	char **filenames;
+	int flags;
+	int retval = EXIT_SUCCESS;
+#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
+	ssize_t c;
+	RESERVE_CONFIG_BUFFER(buf, BUFSIZ);
+#else
+	int c;
+#endif
+
+	flags = bb_getopt_ulflags(argc, argv, "ia");	/* 'a' must be 2nd */
+
+	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. */
+	p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
+	*p = stdout;
+	argv += optind - 1;
+	filenames = argv - 1;
+	*filenames = (char *) bb_msg_standard_input;	/* for later */
+	goto GOT_NEW_FILE;
+
+	do {
+		if ((*p = bb_wfopen(*argv, mode)) == NULL) {
+			retval = EXIT_FAILURE;
+			continue;
+		}
+		filenames[(int)(p - files)] = *argv;
+	GOT_NEW_FILE:
+		setbuf(*p, NULL);	/* tee must not buffer output. */
+		++p;
+	} while (*++argv);
+
+	*p = NULL;				/* Store the sentinal value. */
+
+#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
+	while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
+		for (p=files ; *p ; p++) {
+			fwrite(buf, 1, c, *p);
+		}
+	}
+
+	if (c < 0) {			/* Make sure read errors are signaled. */
+		retval = EXIT_FAILURE;
+	}
+
+#ifdef CONFIG_FEATURE_CLEAN_UP
+	RELEASE_CONFIG_BUFFER(buf);
+#endif
+
+#else
+	setvbuf(stdout, NULL, _IONBF, 0);
+	while ((c = getchar()) != EOF) {
+		for (p=files ; *p ; p++) {
+			putc(c, *p);
+		}
+	}
+#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 bb_fflush_stdout_and_exit()... although fflush()ing
+	 * is unnecessary here. */
+
+	p = files;
+	*p = 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! */
+		bb_xferror(*p, filenames[(int)(p - files)]);
+	} while (*++p);
+
+	bb_fflush_stdout_and_exit(retval);
+}