138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* tee implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config TEE
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//config: bool "tee (4.3 kb)"
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//config: default y
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//config: help
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//config: tee is used to read from standard input and write
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//config: to standard output and files.
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//config:
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//config:config FEATURE_TEE_USE_BLOCK_IO
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//config: bool "Enable block I/O (larger/faster) instead of byte I/O"
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//config: default y
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//config: depends on TEE
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//config: help
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//config: Enable this option for a faster tee, at expense of size.
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//applet:IF_TEE(APPLET(tee, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_TEE) += tee.o
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/* BB_AUDIT SUSv3 compliant */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
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//usage:#define tee_trivial_usage
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//usage: "[-ai] [FILE]..."
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//usage:#define tee_full_usage "\n\n"
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//usage: "Copy stdin to each FILE, and also to stdout\n"
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//usage: "\n -a Append to the given FILEs, don't overwrite"
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//usage: "\n -i Ignore interrupt signals (SIGINT)"
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//usage:
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//usage:#define tee_example_usage
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//usage: "$ echo \"Hello\" | tee /tmp/foo\n"
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//usage: "$ cat /tmp/foo\n"
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//usage: "Hello\n"
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#include "libbb.h"
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#include "common_bufsiz.h"
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int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tee_main(int argc, char **argv)
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{
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const char *mode = "w\0a";
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FILE **files;
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FILE **fp;
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char **names;
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char **np;
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char retval;
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//TODO: make unconditional
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#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
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ssize_t c;
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# define buf bb_common_bufsiz1
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setup_common_bufsiz();
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#else
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int c;
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#endif
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retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
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argc -= optind;
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argv += optind;
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mode += (retval & 2); /* Since 'a' is the 2nd option... */
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if (retval & 1) {
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signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
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}
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retval = EXIT_SUCCESS;
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/* gnu tee ignores SIGPIPE in case one of the output files is a pipe
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* that doesn't consume all its input. Good idea... */
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signal(SIGPIPE, SIG_IGN);
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/* Allocate an array of FILE *'s, with one extra for a sentinel. */
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fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
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np = names = argv - 1;
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files[0] = stdout;
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goto GOT_NEW_FILE;
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do {
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*fp = stdout;
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if (NOT_LONE_DASH(*argv)) {
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*fp = fopen_or_warn(*argv, mode);
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if (*fp == NULL) {
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retval = EXIT_FAILURE;
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argv++;
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continue;
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}
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}
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*np = *argv++;
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GOT_NEW_FILE:
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setbuf(*fp, NULL); /* tee must not buffer output. */
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fp++;
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np++;
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} while (*argv);
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/* names[0] will be filled later */
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#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
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while ((c = safe_read(STDIN_FILENO, buf, COMMON_BUFSIZE)) > 0) {
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fp = files;
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do
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fwrite(buf, 1, c, *fp);
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while (*++fp);
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}
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if (c < 0) { /* Make sure read errors are signaled. */
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retval = EXIT_FAILURE;
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}
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#else
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setvbuf(stdout, NULL, _IONBF, 0);
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while ((c = getchar()) != EOF) {
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fp = files;
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do
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putc(c, *fp);
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while (*++fp);
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}
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#endif
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/* Now we need to check for i/o errors on stdin and the various
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* output files. Since we know that the first entry in the output
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* file table is stdout, we can save one "if ferror" test by
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* setting the first entry to stdin and checking stdout error
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* status with fflush_stdout_and_exit()... although fflush()ing
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* is unnecessary here. */
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np = names;
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fp = files;
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names[0] = (char *) bb_msg_standard_input;
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files[0] = stdin;
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do { /* Now check for input and output errors. */
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/* Checking ferror should be sufficient, but we may want to fclose.
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* If we do, remember not to close stdin! */
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die_if_ferror(*fp++, *np++);
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} while (*fp);
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fflush_stdout_and_exit(retval);
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}
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