blob: 602d06737a65652913f26d0fff2292b6f90410fa
| 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 source tree. |
| 8 | */ |
| 9 | //config:config TEE |
| 10 | //config: bool "tee" |
| 11 | //config: default y |
| 12 | //config: help |
| 13 | //config: tee is used to read from standard input and write |
| 14 | //config: to standard output and files. |
| 15 | //config: |
| 16 | //config:config FEATURE_TEE_USE_BLOCK_IO |
| 17 | //config: bool "Enable block I/O (larger/faster) instead of byte I/O" |
| 18 | //config: default y |
| 19 | //config: depends on TEE |
| 20 | //config: help |
| 21 | //config: Enable this option for a faster tee, at expense of size. |
| 22 | |
| 23 | //applet:IF_TEE(APPLET(tee, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| 24 | |
| 25 | //kbuild:lib-$(CONFIG_TEE) += tee.o |
| 26 | |
| 27 | /* BB_AUDIT SUSv3 compliant */ |
| 28 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */ |
| 29 | |
| 30 | //usage:#define tee_trivial_usage |
| 31 | //usage: "[-ai] [FILE]..." |
| 32 | //usage:#define tee_full_usage "\n\n" |
| 33 | //usage: "Copy stdin to each FILE, and also to stdout\n" |
| 34 | //usage: "\n -a Append to the given FILEs, don't overwrite" |
| 35 | //usage: "\n -i Ignore interrupt signals (SIGINT)" |
| 36 | //usage: |
| 37 | //usage:#define tee_example_usage |
| 38 | //usage: "$ echo \"Hello\" | tee /tmp/foo\n" |
| 39 | //usage: "$ cat /tmp/foo\n" |
| 40 | //usage: "Hello\n" |
| 41 | |
| 42 | #include "libbb.h" |
| 43 | #include "common_bufsiz.h" |
| 44 | |
| 45 | int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 46 | int tee_main(int argc, char **argv) |
| 47 | { |
| 48 | const char *mode = "w\0a"; |
| 49 | FILE **files; |
| 50 | FILE **fp; |
| 51 | char **names; |
| 52 | char **np; |
| 53 | char retval; |
| 54 | //TODO: make unconditional |
| 55 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO |
| 56 | ssize_t c; |
| 57 | # define buf bb_common_bufsiz1 |
| 58 | setup_common_bufsiz(); |
| 59 | #else |
| 60 | int c; |
| 61 | #endif |
| 62 | retval = getopt32(argv, "ia"); /* 'a' must be 2nd */ |
| 63 | argc -= optind; |
| 64 | argv += optind; |
| 65 | |
| 66 | mode += (retval & 2); /* Since 'a' is the 2nd option... */ |
| 67 | |
| 68 | if (retval & 1) { |
| 69 | signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */ |
| 70 | } |
| 71 | retval = EXIT_SUCCESS; |
| 72 | /* gnu tee ignores SIGPIPE in case one of the output files is a pipe |
| 73 | * that doesn't consume all its input. Good idea... */ |
| 74 | signal(SIGPIPE, SIG_IGN); |
| 75 | |
| 76 | /* Allocate an array of FILE *'s, with one extra for a sentinel. */ |
| 77 | fp = files = xzalloc(sizeof(FILE *) * (argc + 2)); |
| 78 | np = names = argv - 1; |
| 79 | |
| 80 | files[0] = stdout; |
| 81 | goto GOT_NEW_FILE; |
| 82 | do { |
| 83 | *fp = stdout; |
| 84 | if (NOT_LONE_DASH(*argv)) { |
| 85 | *fp = fopen_or_warn(*argv, mode); |
| 86 | if (*fp == NULL) { |
| 87 | retval = EXIT_FAILURE; |
| 88 | argv++; |
| 89 | continue; |
| 90 | } |
| 91 | } |
| 92 | *np = *argv++; |
| 93 | GOT_NEW_FILE: |
| 94 | setbuf(*fp, NULL); /* tee must not buffer output. */ |
| 95 | fp++; |
| 96 | np++; |
| 97 | } while (*argv); |
| 98 | /* names[0] will be filled later */ |
| 99 | |
| 100 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO |
| 101 | while ((c = safe_read(STDIN_FILENO, buf, COMMON_BUFSIZE)) > 0) { |
| 102 | fp = files; |
| 103 | do |
| 104 | fwrite(buf, 1, c, *fp); |
| 105 | while (*++fp); |
| 106 | } |
| 107 | if (c < 0) { /* Make sure read errors are signaled. */ |
| 108 | retval = EXIT_FAILURE; |
| 109 | } |
| 110 | #else |
| 111 | setvbuf(stdout, NULL, _IONBF, 0); |
| 112 | while ((c = getchar()) != EOF) { |
| 113 | fp = files; |
| 114 | do |
| 115 | putc(c, *fp); |
| 116 | while (*++fp); |
| 117 | } |
| 118 | #endif |
| 119 | |
| 120 | /* Now we need to check for i/o errors on stdin and the various |
| 121 | * output files. Since we know that the first entry in the output |
| 122 | * file table is stdout, we can save one "if ferror" test by |
| 123 | * setting the first entry to stdin and checking stdout error |
| 124 | * status with fflush_stdout_and_exit()... although fflush()ing |
| 125 | * is unnecessary here. */ |
| 126 | np = names; |
| 127 | fp = files; |
| 128 | names[0] = (char *) bb_msg_standard_input; |
| 129 | files[0] = stdin; |
| 130 | do { /* Now check for input and output errors. */ |
| 131 | /* Checking ferror should be sufficient, but we may want to fclose. |
| 132 | * If we do, remember not to close stdin! */ |
| 133 | die_if_ferror(*fp++, *np++); |
| 134 | } while (*fp); |
| 135 | |
| 136 | fflush_stdout_and_exit(retval); |
| 137 | } |
| 138 |