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

int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tee_main(int argc, char **argv)
{
	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
	retval = getopt32(argv, "ia");	/* 'a' must be 2nd */
	argc -= optind;
	argv += optind;

	mode += (retval & 2);	/* Since 'a' is the 2nd option... */

	if (retval & 1) {
		signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
	}
	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 sentinal. */
	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);
	}
	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 "libbb.h"
14	#include <signal.h>
15
16	int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
17	int tee_main(int argc, char **argv)
18	{
19	const char *mode = "w\0a";
20	FILE **files;
21	FILE **fp;
22	char **names;
23	char **np;
24	char retval;
25	//TODO: make unconditional
26	#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
27	ssize_t c;
28	# define buf bb_common_bufsiz1
29	#else
30	int c;
31	#endif
32	retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
33	argc -= optind;
34	argv += optind;
35
36	mode += (retval & 2); /* Since 'a' is the 2nd option... */
37
38	if (retval & 1) {
39	signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
40	}
41	retval = EXIT_SUCCESS;
42	/* gnu tee ignores SIGPIPE in case one of the output files is a pipe
43	* that doesn't consume all its input. Good idea... */
44	signal(SIGPIPE, SIG_IGN);
45
46	/* Allocate an array of FILE 's, with one extra for a sentinal. /
47	fp = files = xzalloc(sizeof(FILE ) (argc + 2));
48	np = names = argv - 1;
49
50	files[0] = stdout;
51	goto GOT_NEW_FILE;
52	do {
53	*fp = stdout;
54	if (NOT_LONE_DASH(*argv)) {
55	fp = fopen_or_warn(argv, mode);
56	if (*fp == NULL) {
57	retval = EXIT_FAILURE;
58	argv++;
59	continue;
60	}
61	}
62	np = argv++;
63	GOT_NEW_FILE:
64	setbuf(fp, NULL); / tee must not buffer output. */
65	fp++;
66	np++;
67	} while (*argv);
68	/* names[0] will be filled later */
69
70	#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
71	while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
72	fp = files;
73	do
74	fwrite(buf, 1, c, *fp++);
75	while (*fp);
76	}
77	if (c < 0) { /* Make sure read errors are signaled. */
78	retval = EXIT_FAILURE;
79	}
80	#else
81	setvbuf(stdout, NULL, _IONBF, 0);
82	while ((c = getchar()) != EOF) {
83	fp = files;
84	do
85	putc(c, *fp++);
86	while (*fp);
87	}
88	#endif
89
90	/* Now we need to check for i/o errors on stdin and the various
91	* output files. Since we know that the first entry in the output
92	* file table is stdout, we can save one "if ferror" test by
93	* setting the first entry to stdin and checking stdout error
94	* status with fflush_stdout_and_exit()... although fflush()ing
95	* is unnecessary here. */
96	np = names;
97	fp = files;
98	names[0] = (char *) bb_msg_standard_input;
99	files[0] = stdin;
100	do { /* Now check for input and output errors. */
101	/* Checking ferror should be sufficient, but we may want to fclose.
102	* If we do, remember not to close stdin! */
103	die_if_ferror(fp++, np++);
104	} while (*fp);
105
106	fflush_stdout_and_exit(retval);
107	}