| /* vi: set sw=4 ts=4: */ |
| /* |
| * tee implementation for busybox |
| * |
| * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| |
| /* BB_AUDIT SUSv3 compliant */ |
| /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */ |
| |
| //usage:#define tee_trivial_usage |
| //usage: "[-ai] [FILE]..." |
| //usage:#define tee_full_usage "\n\n" |
| //usage: "Copy stdin to each FILE, and also to stdout\n" |
| //usage: "\nOptions:" |
| //usage: "\n -a Append to the given FILEs, don't overwrite" |
| //usage: "\n -i Ignore interrupt signals (SIGINT)" |
| //usage: |
| //usage:#define tee_example_usage |
| //usage: "$ echo \"Hello\" | tee /tmp/foo\n" |
| //usage: "$ cat /tmp/foo\n" |
| //usage: "Hello\n" |
| |
| #include "libbb.h" |
| |
| int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int tee_main(int argc, char **argv) |
| { |
| const char *mode = "w\0a"; |
| FILE **files; |
| FILE **fp; |
| char **names; |
| char **np; |
| char retval; |
| //TODO: make unconditional |
| #if ENABLE_FEATURE_TEE_USE_BLOCK_IO |
| ssize_t c; |
| # define buf bb_common_bufsiz1 |
| #else |
| int c; |
| #endif |
| retval = getopt32(argv, "ia"); /* 'a' must be 2nd */ |
| argc -= optind; |
| argv += optind; |
| |
| mode += (retval & 2); /* Since 'a' is the 2nd option... */ |
| |
| if (retval & 1) { |
| signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */ |
| } |
| retval = EXIT_SUCCESS; |
| /* gnu tee ignores SIGPIPE in case one of the output files is a pipe |
| * that doesn't consume all its input. Good idea... */ |
| signal(SIGPIPE, SIG_IGN); |
| |
| /* Allocate an array of FILE *'s, with one extra for a sentinel. */ |
| fp = files = xzalloc(sizeof(FILE *) * (argc + 2)); |
| np = names = argv - 1; |
| |
| files[0] = stdout; |
| goto GOT_NEW_FILE; |
| do { |
| *fp = stdout; |
| if (NOT_LONE_DASH(*argv)) { |
| *fp = fopen_or_warn(*argv, mode); |
| if (*fp == NULL) { |
| retval = EXIT_FAILURE; |
| argv++; |
| continue; |
| } |
| } |
| *np = *argv++; |
| GOT_NEW_FILE: |
| setbuf(*fp, NULL); /* tee must not buffer output. */ |
| fp++; |
| np++; |
| } while (*argv); |
| /* names[0] will be filled later */ |
| |
| #if ENABLE_FEATURE_TEE_USE_BLOCK_IO |
| while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) { |
| fp = files; |
| do |
| fwrite(buf, 1, c, *fp); |
| while (*++fp); |
| } |
| if (c < 0) { /* Make sure read errors are signaled. */ |
| retval = EXIT_FAILURE; |
| } |
| #else |
| setvbuf(stdout, NULL, _IONBF, 0); |
| while ((c = getchar()) != EOF) { |
| fp = files; |
| do |
| putc(c, *fp); |
| while (*++fp); |
| } |
| #endif |
| |
| /* Now we need to check for i/o errors on stdin and the various |
| * output files. Since we know that the first entry in the output |
| * file table is stdout, we can save one "if ferror" test by |
| * setting the first entry to stdin and checking stdout error |
| * status with fflush_stdout_and_exit()... although fflush()ing |
| * is unnecessary here. */ |
| np = names; |
| fp = files; |
| names[0] = (char *) bb_msg_standard_input; |
| files[0] = stdin; |
| do { /* Now check for input and output errors. */ |
| /* Checking ferror should be sufficient, but we may want to fclose. |
| * If we do, remember not to close stdin! */ |
| die_if_ferror(*fp++, *np++); |
| } while (*fp); |
| |
| fflush_stdout_and_exit(retval); |
| } |