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 | * This program is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 | * General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 | *
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21 | */
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22 |
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23 | /* BB_AUDIT SUSv3 compliant */
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24 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
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25 |
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26 | #include <stdio.h>
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27 | #include <stdlib.h>
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28 | #include <signal.h>
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29 | #include <unistd.h>
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30 | #include "busybox.h"
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31 |
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32 | int tee_main(int argc, char **argv)
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33 | {
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34 | const char *mode = "w\0a";
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35 | FILE **files;
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36 | FILE **p;
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37 | char **filenames;
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38 | int flags;
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39 | int retval = EXIT_SUCCESS;
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40 | #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
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41 | ssize_t c;
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42 | # define buf bb_common_bufsiz1
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43 | #else
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44 | int c;
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45 | #endif
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46 |
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47 | flags = bb_getopt_ulflags(argc, argv, "ia"); /* 'a' must be 2nd */
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48 |
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49 | mode += (flags & 2); /* Since 'a' is the 2nd option... */
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50 |
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51 | if (flags & 1) {
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52 | signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction.*/
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53 | }
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54 |
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55 | /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
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56 | * that doesn't consume all its input. Good idea... */
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57 | signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction.*/
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58 |
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59 | /* Allocate an array of FILE *'s, with one extra for a sentinal. */
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60 | p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
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61 | *p = stdout;
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62 | argv += optind - 1;
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63 | filenames = argv - 1;
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64 | *filenames = (char *) bb_msg_standard_input; /* for later */
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65 | goto GOT_NEW_FILE;
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66 |
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67 | do {
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68 | if ((*p = bb_wfopen(*argv, mode)) == NULL) {
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69 | retval = EXIT_FAILURE;
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70 | continue;
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71 | }
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72 | filenames[(int)(p - files)] = *argv;
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73 | GOT_NEW_FILE:
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74 | setbuf(*p, NULL); /* tee must not buffer output. */
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75 | ++p;
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76 | } while (*++argv);
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77 |
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78 | *p = NULL; /* Store the sentinal value. */
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79 |
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80 | #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
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81 | while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
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82 | for (p=files ; *p ; p++) {
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83 | fwrite(buf, 1, c, *p);
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84 | }
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85 | }
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86 |
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87 | if (c < 0) { /* Make sure read errors are signaled. */
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88 | retval = EXIT_FAILURE;
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89 | }
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90 |
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91 | #else
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92 | setvbuf(stdout, NULL, _IONBF, 0);
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93 | while ((c = getchar()) != EOF) {
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94 | for (p=files ; *p ; p++) {
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95 | putc(c, *p);
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96 | }
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97 | }
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98 | #endif
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99 |
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100 | /* Now we need to check for i/o errors on stdin and the various
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101 | * output files. Since we know that the first entry in the output
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102 | * file table is stdout, we can save one "if ferror" test by
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103 | * setting the first entry to stdin and checking stdout error
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104 | * status with bb_fflush_stdout_and_exit()... although fflush()ing
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105 | * is unnecessary here. */
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106 |
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107 | p = files;
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108 | *p = stdin;
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109 | do { /* Now check for (input and) output errors. */
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110 | /* Checking ferror should be sufficient, but we may want to fclose.
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111 | * If we do, remember not to close stdin! */
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112 | bb_xferror(*p, filenames[(int)(p - files)]);
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113 | } while (*++p);
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114 |
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115 | bb_fflush_stdout_and_exit(retval);
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116 | }
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