/* vi: set sw=4 ts=4: */
/*
- * Mini tee implementation for busybox
+ * tee implementation for busybox
*
- * Copyright (C) 1999,2000,2001 by Lineo, inc.
- * Written by Matt Kraai <kraai@alumni.carnegiemellon.edu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
+
#include "busybox.h"
-#include <getopt.h>
-#include <stdio.h>
+#include <signal.h>
-int
-tee_main(int argc, char **argv)
+int tee_main(int argc, char **argv);
+int tee_main(int argc, char **argv)
{
- char *mode = "w";
- int c, i, status = 0, nfiles = 0;
+ const char *mode = "w\0a";
FILE **files;
+ FILE **fp;
+ char **names;
+ char **np;
+ char retval;
+#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
+ ssize_t c;
+# define buf bb_common_bufsiz1
+#else
+ int c;
+#endif
+ retval = getopt32(argc, argv, "ia"); /* 'a' must be 2nd */
+ argc -= optind;
+ argv += optind;
- while ((c = getopt(argc, argv, "a")) != EOF) {
- switch (c) {
- case 'a':
- mode = "a";
- break;
- default:
- usage(tee_usage);
- }
+ mode += (retval & 2); /* Since 'a' is the 2nd option... */
+
+ if (retval & 1) {
+ signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */
}
+ 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); /* TODO - switch to sigaction. */
- files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 1));
- files[nfiles++] = stdout;
- while (optind < argc) {
- if ((files[nfiles++] = fopen(argv[optind++], mode)) == NULL) {
- nfiles--;
- perror_msg("%s", argv[optind-1]);
- status = 1;
+ /* Allocate an array of FILE *'s, with one extra for a sentinal. */
+ fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
+ np = names = argv - 1;
+
+ files[0] = stdout;
+ goto GOT_NEW_FILE;
+ do {
+ *fp = fopen_or_warn(*argv, mode);
+ if (*fp == NULL) {
+ retval = EXIT_FAILURE;
+ continue;
}
+ *np = *argv++;
+ GOT_NEW_FILE:
+ setbuf(*fp++, NULL); /* tee must not buffer output. */
+ np++;
+ } while (*argv);
+ /* names[0] will be filled later */
+
+#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
+ while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 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
- while ((c = getchar()) != EOF)
- for (i = 0; i < nfiles; i++)
- putc(c, files[i]);
+ /* 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);
- return status;
+ fflush_stdout_and_exit(retval);
}
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff