/* vi: set sw=4 ts=4: */
/*
- * Mini tee implementation for busybox
+ * tee implementation for busybox
*
+ * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
- * Copyright (C) 1999,2000 by Lineo, inc.
- * Written by John Beppu <beppu@lineo.com>
- *
- * 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#include "internal.h"
-#include <errno.h>
-#include <stdio.h>
-
-static const char tee_usage[] =
- "tee [OPTION]... [FILE]...\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nCopy standard input to each FILE, and also to standard output.\n\n"
- "Options:\n" "\t-a\tappend to the given FILEs, do not overwrite\n"
-#if 0
- "\t-i\tignore interrupt signals\n"
-#endif
-#endif
-;
-
-
-/* FileList _______________________________________________________________ */
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
-#define FL_MAX 1024
-static FILE **FileList;
-static int FL_end;
+//usage:#define tee_trivial_usage
+//usage: "[-ai] [FILE]..."
+//usage:#define tee_full_usage "\n\n"
+//usage: "Copy stdin to each FILE, and also to stdout\n"
+//usage: "\n -a Append to the given FILEs, don't overwrite"
+//usage: "\n -i Ignore interrupt signals (SIGINT)"
+//usage:
+//usage:#define tee_example_usage
+//usage: "$ echo \"Hello\" | tee /tmp/foo\n"
+//usage: "$ cat /tmp/foo\n"
+//usage: "Hello\n"
-typedef void (FL_Function) (FILE * file, char c);
+#include "libbb.h"
-
-/* apply a function to everything in FileList */
-static void FL_apply(FL_Function * f, char c)
-{
- int i;
-
- for (i = 0; i <= FL_end; i++) {
- f(FileList[i], c);
- }
-}
-
-/* FL_Function for writing to files*/
-static void tee_fwrite(FILE * file, char c)
-{
- fputc(c, file);
-}
-
-/* FL_Function for closing files */
-static void tee_fclose(FILE * file, char c)
-{
- fclose(file);
-}
-
-/* ________________________________________________________________________ */
-
-/* BusyBoxed tee(1) */
+int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tee_main(int argc, char **argv)
{
- int i;
- char c;
- char opt;
- char opt_fopen[2] = "w";
- FILE *file;
-
- /* parse argv[] */
- for (i = 1; i < argc; i++) {
- if (argv[i][0] == '-') {
- opt = argv[i][1];
- switch (opt) {
- case 'a':
- opt_fopen[0] = 'a';
- break;
-#if 0
- case 'i':
- fprintf(stderr, "ignore interrupt not implemented\n");
- break;
+ const char *mode = "w\0a";
+ FILE **files;
+ FILE **fp;
+ char **names;
+ char **np;
+ char retval;
+//TODO: make unconditional
+#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
+ ssize_t c;
+# define buf bb_common_bufsiz1
+#else
+ int c;
#endif
- default:
- usage(tee_usage);
- }
- } else {
- break;
- }
- }
+ retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
+ argc -= optind;
+ argv += optind;
+
+ mode += (retval & 2); /* Since 'a' is the 2nd option... */
- /* init FILE pointers */
- FileList = calloc(FL_MAX, sizeof(FILE*));
- if (!FileList) {
- fprintf(stderr, "tee: %s\n", strerror(errno));
- exit(1);
+ if (retval & 1) {
+ signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
}
- FL_end = 0;
- FileList[0] = stdout;
- for (; i < argc; i++) {
- /* add a file to FileList */
- file = fopen(argv[i], opt_fopen);
- if (!file) {
- continue;
- }
- if (FL_end < FL_MAX) {
- FileList[++FL_end] = file;
+ retval = EXIT_SUCCESS;
+ /* 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);
+
+ /* Allocate an array of FILE *'s, with one extra for a sentinel. */
+ fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
+ np = names = argv - 1;
+
+ files[0] = stdout;
+ goto GOT_NEW_FILE;
+ do {
+ *fp = stdout;
+ if (NOT_LONE_DASH(*argv)) {
+ *fp = fopen_or_warn(*argv, mode);
+ if (*fp == NULL) {
+ retval = EXIT_FAILURE;
+ argv++;
+ continue;
+ }
}
+ *np = *argv++;
+ GOT_NEW_FILE:
+ setbuf(*fp, NULL); /* tee must not buffer output. */
+ fp++;
+ np++;
+ } while (*argv);
+ /* names[0] will be filled later */
+
+#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
+ while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
+ fp = files;
+ do
+ fwrite(buf, 1, c, *fp);
+ while (*++fp);
}
-
- /* read and redirect */
- while ((c = (char) getchar()) && (!feof(stdin))) {
- FL_apply(tee_fwrite, c);
+ 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
- /* clean up */
- FL_apply(tee_fclose, 0);
- /* Don't bother to close files Exit does that
- * automagically, so we can save a few bytes */
- /* free(FileList); */
- exit(0);
+ /* 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);
}
-
-/* $Id: tee.c,v 1.10 2000/05/12 19:41:47 erik Exp $ */
projects / platform / upstream / busybox.git / blobdiff