101 lines
2.5 KiB
C
101 lines
2.5 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 tarball for details.
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*/
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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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#include "busybox.h"
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#include <signal.h>
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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 **p;
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char **filenames;
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int flags;
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int retval = EXIT_SUCCESS;
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#ifdef CONFIG_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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#else
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int c;
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#endif
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flags = getopt32(argc, argv, "ia"); /* 'a' must be 2nd */
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mode += (flags & 2); /* Since 'a' is the 2nd option... */
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if (flags & 1) {
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signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction.*/
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}
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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); /* TODO - switch to sigaction.*/
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/* Allocate an array of FILE *'s, with one extra for a sentinal. */
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p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
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*p = stdout;
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argv += optind - 1;
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filenames = argv - 1;
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*filenames = (char *) bb_msg_standard_input; /* for later */
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goto GOT_NEW_FILE;
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do {
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if ((*p = fopen_or_warn(*argv, mode)) == NULL) {
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retval = EXIT_FAILURE;
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continue;
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}
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filenames[(int)(p - files)] = *argv;
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GOT_NEW_FILE:
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setbuf(*p, NULL); /* tee must not buffer output. */
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++p;
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} while (*++argv);
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*p = NULL; /* Store the sentinal value. */
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#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
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while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
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for (p=files ; *p ; p++) {
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fwrite(buf, 1, c, *p);
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}
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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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for (p=files ; *p ; p++) {
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putc(c, *p);
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}
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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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p = files;
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*p = 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(*p, filenames[(int)(p - files)]);
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} while (*++p);
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fflush_stdout_and_exit(retval);
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}
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