busybox/coreutils/tee.c

/* vi: set sw=4 ts=4: */
/*
 * tee implementation for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */

#include "busybox.h"
#include <signal.h>

int tee_main(int argc, char **argv)
{
	const char *mode = "w\0a";
	FILE **files;
	FILE **fp;
	char **names;
	char **np;
	int flags;
	int retval = EXIT_SUCCESS;
#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
	ssize_t c;
# define buf bb_common_bufsiz1
#else
	int c;
#endif
	flags = getopt32(argc, argv, "ia");	/* 'a' must be 2nd */
	argc -= optind;
	argv += optind;

	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. */
	fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
	np = names = argv - 1;

	files[0] = stdout;
	goto GOT_NEW_FILE;
	do {
		*fp = fopen_or_warn(*argv, mode);
		if (*fp == NULL) {
			retval = EXIT_FAILURE;
			continue;
		}
		*np = *argv++;
 GOT_NEW_FILE:
		setbuf(*fp++, NULL);	/* tee must not buffer output. */
		np++;
	} while (*argv);
	/* names[0] will be filled later */

#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
	while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
		fp = files;
		do
			fwrite(buf, 1, c, *fp++);
		while (*fp);
	}
	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

	/* 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);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* tee implementation for busybox
4	*
5	* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8	*/
9
10	/* BB_AUDIT SUSv3 compliant */
11	/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
12
13	#include "busybox.h"
14	#include <signal.h>
15
16	int tee_main(int argc, char **argv)
17	{
18	const char *mode = "w\0a";
19	FILE **files;
20	FILE **fp;
21	char **names;
22	char **np;
23	int flags;
24	int retval = EXIT_SUCCESS;
25	#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
26	ssize_t c;
27	# define buf bb_common_bufsiz1
28	#else
29	int c;
30	#endif
31	flags = getopt32(argc, argv, "ia"); /* 'a' must be 2nd */
32	argc -= optind;
33	argv += optind;
34
35	mode += (flags & 2); /* Since 'a' is the 2nd option... */
36
37	if (flags & 1) {
38	signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */
39	}
40	/* gnu tee ignores SIGPIPE in case one of the output files is a pipe
41	* that doesn't consume all its input. Good idea... */
42	signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction. */
43
44	/* Allocate an array of FILE 's, with one extra for a sentinal. /
45	fp = files = xzalloc(sizeof(FILE ) (argc + 2));
46	np = names = argv - 1;
47
48	files[0] = stdout;
49	goto GOT_NEW_FILE;
50	do {
51	fp = fopen_or_warn(argv, mode);
52	if (*fp == NULL) {
53	retval = EXIT_FAILURE;
54	continue;
55	}
56	np = argv++;
57	GOT_NEW_FILE:
58	setbuf(fp++, NULL); / tee must not buffer output. */
59	np++;
60	} while (*argv);
61	/* names[0] will be filled later */
62
63	#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
64	while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
65	fp = files;
66	do
67	fwrite(buf, 1, c, *fp++);
68	while (*fp);
69	}
70	if (c < 0) { /* Make sure read errors are signaled. */
71	retval = EXIT_FAILURE;
72	}
73	#else
74	setvbuf(stdout, NULL, _IONBF, 0);
75	while ((c = getchar()) != EOF) {
76	fp = files;
77	do
78	putc(c, *fp++);
79	while (*fp);
80	}
81	#endif
82
83	/* Now we need to check for i/o errors on stdin and the various
84	* output files. Since we know that the first entry in the output
85	* file table is stdout, we can save one "if ferror" test by
86	* setting the first entry to stdin and checking stdout error
87	* status with fflush_stdout_and_exit()... although fflush()ing
88	* is unnecessary here. */
89	np = names;
90	fp = files;
91	names[0] = (char *) bb_msg_standard_input;
92	files[0] = stdin;
93	do { /* Now check for input and output errors. */
94	/* Checking ferror should be sufficient, but we may want to fclose.
95	* If we do, remember not to close stdin! */
96	die_if_ferror(fp++, np++);
97	} while (*fp);
98
99	fflush_stdout_and_exit(retval);
100	}