mirror of
https://github.com/sheumann/hush.git
synced 2024-12-30 05:29:47 +00:00
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/* 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 tarball for details.
|
|
*/
|
|
|
|
/* BB_AUDIT SUSv3 compliant */
|
|
/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
|
|
|
|
#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 sentinal. */
|
|
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);
|
|
}
|