| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * tee implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | */
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| 9 |
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| 10 | /* BB_AUDIT SUSv3 compliant */
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| 11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
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| 12 |
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| 13 | #include "libbb.h"
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| 14 | #include <signal.h>
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| 15 |
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| 16 | int tee_main(int argc, char **argv);
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| 17 | int tee_main(int argc, char **argv)
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| 18 | {
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| 19 | const char *mode = "w\0a";
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| 20 | FILE **files;
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| 21 | FILE **fp;
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| 22 | char **names;
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| 23 | char **np;
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| 24 | char retval;
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| 25 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
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| 26 | ssize_t c;
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| 27 | # define buf bb_common_bufsiz1
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| 28 | #else
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| 29 | int c;
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| 30 | #endif
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| 31 | retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
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| 32 | argc -= optind;
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| 33 | argv += optind;
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| 34 |
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| 35 | mode += (retval & 2); /* Since 'a' is the 2nd option... */
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| 36 |
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| 37 | if (retval & 1) {
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| 38 | signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */
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| 39 | }
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| 40 | retval = EXIT_SUCCESS;
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| 41 | /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
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| 42 | * that doesn't consume all its input. Good idea... */
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| 43 | signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction. */
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| 44 |
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| 45 | /* Allocate an array of FILE *'s, with one extra for a sentinal. */
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| 46 | fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
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| 47 | np = names = argv - 1;
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| 48 |
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| 49 | files[0] = stdout;
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| 50 | goto GOT_NEW_FILE;
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| 51 | do {
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| 52 | *fp = fopen_or_warn(*argv, mode);
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| 53 | if (*fp == NULL) {
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| 54 | retval = EXIT_FAILURE;
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| 55 | continue;
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| 56 | }
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| 57 | *np = *argv++;
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| 58 | GOT_NEW_FILE:
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| 59 | setbuf(*fp++, NULL); /* tee must not buffer output. */
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| 60 | np++;
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| 61 | } while (*argv);
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| 62 | /* names[0] will be filled later */
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| 63 |
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| 64 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
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| 65 | while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
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| 66 | fp = files;
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| 67 | do
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| 68 | fwrite(buf, 1, c, *fp++);
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| 69 | while (*fp);
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| 70 | }
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| 71 | if (c < 0) { /* Make sure read errors are signaled. */
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| 72 | retval = EXIT_FAILURE;
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| 73 | }
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| 74 | #else
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| 75 | setvbuf(stdout, NULL, _IONBF, 0);
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| 76 | while ((c = getchar()) != EOF) {
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| 77 | fp = files;
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| 78 | do
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| 79 | putc(c, *fp++);
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| 80 | while (*fp);
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| 81 | }
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| 82 | #endif
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| 83 |
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| 84 | /* Now we need to check for i/o errors on stdin and the various
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| 85 | * output files. Since we know that the first entry in the output
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| 86 | * file table is stdout, we can save one "if ferror" test by
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| 87 | * setting the first entry to stdin and checking stdout error
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| 88 | * status with fflush_stdout_and_exit()... although fflush()ing
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| 89 | * is unnecessary here. */
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| 90 | np = names;
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| 91 | fp = files;
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| 92 | names[0] = (char *) bb_msg_standard_input;
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| 93 | files[0] = stdin;
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| 94 | do { /* Now check for input and output errors. */
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| 95 | /* Checking ferror should be sufficient, but we may want to fclose.
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| 96 | * If we do, remember not to close stdin! */
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| 97 | die_if_ferror(*fp++, *np++);
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| 98 | } while (*fp);
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| 99 |
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| 100 | fflush_stdout_and_exit(retval);
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| 101 | }
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