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 */
15 int tee_main(int argc, char **argv)
17 const char *mode = "w\0a";
22 int retval = EXIT_SUCCESS;
23 #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
25 # define buf bb_common_bufsiz1
30 flags = bb_getopt_ulflags(argc, argv, "ia"); /* 'a' must be 2nd */
32 mode += (flags & 2); /* Since 'a' is the 2nd option... */
35 signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction.*/
38 /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
39 * that doesn't consume all its input. Good idea... */
40 signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction.*/
42 /* Allocate an array of FILE *'s, with one extra for a sentinal. */
43 p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
47 *filenames = (char *) bb_msg_standard_input; /* for later */
51 if ((*p = bb_wfopen(*argv, mode)) == NULL) {
52 retval = EXIT_FAILURE;
55 filenames[(int)(p - files)] = *argv;
57 setbuf(*p, NULL); /* tee must not buffer output. */
61 *p = NULL; /* Store the sentinal value. */
63 #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
64 while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
65 for (p=files ; *p ; p++) {
66 fwrite(buf, 1, c, *p);
70 if (c < 0) { /* Make sure read errors are signaled. */
71 retval = EXIT_FAILURE;
75 setvbuf(stdout, NULL, _IONBF, 0);
76 while ((c = getchar()) != EOF) {
77 for (p=files ; *p ; p++) {
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 bb_fflush_stdout_and_exit()... although fflush()ing
88 * is unnecessary here. */
92 do { /* Now check for (input and) output errors. */
93 /* Checking ferror should be sufficient, but we may want to fclose.
94 * If we do, remember not to close stdin! */
95 xferror(*p, filenames[(int)(p - files)]);
98 bb_fflush_stdout_and_exit(retval);