/* vi: set sw=4 ts=4: */
/*
- * Mini tee implementation for busybox
+ * tee implementation for busybox
*
- * Copyright (C) 1999,2000 by Lineo, inc.
- * Written 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
*
*/
-#include "internal.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
+ 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. */
- while ((c = getopt(argc, argv, "a")) != EOF) {
- switch (c) {
- case 'a':
- mode = "a";
- break;
- default:
- usage(tee_usage);
+#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);
}
}
- files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 1));
- files[nfiles++] = stdout;
- while (optind < argc) {
- if ((files[nfiles++] = fopen(argv[optind++], mode)) == NULL) {
- nfiles--;
- errorMsg("%s: %s\n", argv[optind-1], strerror(errno));
- status = 1;
+ 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
- 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);
+}