X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=coreutils%2Ftee.c;h=73c2f8e9df406c6f0f790141ebdd835a5ddf32be;hb=637d2266e1ea711f27ab0aec200a196b5eccbbca;hp=1c145426a166c0e796b5dc2cd7f23249d3d051ef;hpb=bdfd0d78bc44e73d693510e70087857785b3b521;p=oweals%2Fbusybox.git

diff --git a/coreutils/tee.c b/coreutils/tee.c
index 1c145426a..73c2f8e9d 100644
--- a/coreutils/tee.c
+++ b/coreutils/tee.c
@@ -1,8 +1,8 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Mini tee implementation for busybox
+ * tee implementation for busybox
  *
- * Copyright (C) 2000,2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
+ * 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
@@ -20,47 +20,97 @@
  *
  */
 
-#include "busybox.h"
-#include <getopt.h>
+/* 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)
+int tee_main(int argc, char **argv)
 {
-	char *mode = "w";
-	int c, i, status = 0, nfiles = 0;
+	const char *mode = "w\0a";
 	FILE **files;
+	FILE **p;
+	char **filenames;
+	int flags;
+	int retval = EXIT_SUCCESS;
+#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
+	size_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.*/
 
-	while ((c = getopt(argc, argv, "a")) != EOF) {
-		switch (c) {
-		case 'a': 
-			mode = "a";
-			break;
-		default:
-			show_usage();
+	/* 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 = fread(buf, 1, BUFSIZ, stdin)) != 0) {
+		for (p=files ; *p ; p++) {
+			fwrite(buf, 1, c, *p);
 		}
 	}
 
-	files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 1));
-	files[nfiles++] = stdout;
-	while (optind < argc) {
-		if ((files[nfiles++] = wfopen(argv[optind++], mode)) == NULL) {
-			nfiles--;
-			status = 1;
+#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
 
-	while ((c = getchar()) != EOF)
-		for (i = 0; i < nfiles; i++)
-			putc(c, files[i]);
+	/* 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. */
 
-	return status;
-}
+	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);
 
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+	bb_fflush_stdout_and_exit(retval);
+}