+/* vi: set sw=4 ts=4: */
/*
- * Mini tee implementation for busybox
+ * tee implementation for busybox
*
- *
- * Copyright (C) 1999 by Lineo, inc.
- * Written by John Beppu <beppu@line.com>
+ * 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
*
*/
+/* 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"
-/* FileList _______________________________________________________________ */
-
-#define FL_MAX 1024
-static FILE *FileList[FL_MAX];
-static int FL_end;
-
-typedef void (FL_Function)(FILE *file, char c);
-
-/* initialize FileList */
-static void
-FL_init()
-{
- FL_end = 0;
- FileList[0] = stdout;
-}
-
-/* add a file to FileList */
-static int
-FL_add(const char *filename, char *opt_open)
-{
- FILE *file;
-
- file = fopen(filename, opt_open);
- if (!file) { return 0; };
- if (FL_end < FL_MAX) {
- FileList[++FL_end] = file;
- }
- return 1;
-}
-
-/* apply a function to everything in FileList */
-static void
-FL_apply(FL_Function *f, char c)
+int tee_main(int argc, char **argv)
{
- 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);
-}
+ 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.*/
+ }
-/* FL_Function for closing files */
-static void
-tee_fclose(FILE *file, char c)
-{
- fclose(file);
-}
+ /* 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 = fread(buf, 1, BUFSIZ, stdin)) != 0) {
+ for (p=files ; *p ; p++) {
+ fwrite(buf, 1, c, *p);
+ }
+ }
-/* help message */
-static void
-tee_usage()
-{
- fprintf (
- stdout,
- "%s\n%s\n%s\n%s\n%s\n",
- "Usage: tee [OPTION]... [FILE]...",
- "Copy standard input to each FILE, and also to standard output.\n",
- " -a, append to the given FILEs, do not overwrite",
- " -i, ignore interrupt signals",
- " -h, this help message"
- );
- exit(1);
-}
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ RELEASE_CONFIG_BUFFER(buf);
+#endif
-/* BusyBoxed tee(1) */
-int
-tee_main(int argc, char **argv)
-{
- int i;
- char c;
- char opt;
- char opt_fopen[2] = "w";
-
- /* 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;
- case 'i':
- fprintf(stderr, "ingore interrupt not implemented\n");
- break;
- case 'h':
- tee_usage();
- break;
- default:
- fprintf(stderr, "tee: invalid option -- %c\n", opt);
- tee_usage();
- }
- } else {
- break;
+#else
+ setvbuf(stdout, NULL, _IONBF, 0);
+ while ((c = getchar()) != EOF) {
+ for (p=files ; *p ; p++) {
+ putc(c, *p);
+ }
}
- }
-
- /* init FILE pointers */
- FL_init();
- for ( ; i < argc; i++) {
- FL_add(argv[i], opt_fopen);
- }
-
- /* read and redirect */
- while ((c = (char) getchar()) && (!feof(stdin))) {
- FL_apply(tee_fwrite, c);
- }
-
- /* clean up */
- FL_apply(tee_fclose, 0);
- exit(0);
+#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);
}
-
-/* $Id: tee.c,v 1.1 1999/12/10 05:27:16 beppu Exp $ */
projects / oweals / busybox.git / blobdiff