1 /* vi: set sw=4 ts=4: */
3 * tee implementation for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 /* BB_AUDIT SUSv3 compliant */
11 /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
16 int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
17 int tee_main(int argc, char **argv)
19 const char *mode = "w\0a";
25 //TODO: make unconditional
26 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
28 # define buf bb_common_bufsiz1
32 retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
36 mode += (retval & 2); /* Since 'a' is the 2nd option... */
39 signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
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);
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;
54 if (NOT_LONE_DASH(*argv)) {
55 *fp = fopen_or_warn(*argv, mode);
57 retval = EXIT_FAILURE;
63 setbuf(*fp++, NULL); /* tee must not buffer output. */
66 /* names[0] will be filled later */
68 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
69 while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
72 fwrite(buf, 1, c, *fp++);
75 if (c < 0) { /* Make sure read errors are signaled. */
76 retval = EXIT_FAILURE;
79 setvbuf(stdout, NULL, _IONBF, 0);
80 while ((c = getchar()) != EOF) {
88 /* Now we need to check for i/o errors on stdin and the various
89 * output files. Since we know that the first entry in the output
90 * file table is stdout, we can save one "if ferror" test by
91 * setting the first entry to stdin and checking stdout error
92 * status with fflush_stdout_and_exit()... although fflush()ing
93 * is unnecessary here. */
96 names[0] = (char *) bb_msg_standard_input;
98 do { /* Now check for input and output errors. */
99 /* Checking ferror should be sufficient, but we may want to fclose.
100 * If we do, remember not to close stdin! */
101 die_if_ferror(*fp++, *np++);
104 fflush_stdout_and_exit(retval);