busybox/coreutils/tee.c
Bernhard Reutner-Fischer 73561cc75a - pull from busybox_scratch: r15829:15850
Various fixes, cleanups and shrinkage:
saves 952 Bytes:
   text    data     bss     dec     hex filename
1087742   15853  790632 1894227  1ce753 ../busybox/busybox.old
1086790   15853  790632 1893275  1ce39b busybox
via:
# scripts/bloat-o-meter ../busybox/busybox_unstripped.old busybox_unstripped 
function                                             old     new   delta
ipcrm_main                                           756     822     +66
getval                                                 -      61     +61
maybe_set_utc                                          -      40     +40
udhcpc_main                                         2896    2912     +16
md5_hash_block                                       428     437      +9
opt                                                    8      16      +8
qgravechar                                           106     110      +4
make_bitmap                                          292     295      +3
inflate_unzip                                       2056    2059      +3
add_partition                                       1412    1414      +2
__parsespent                                         156     158      +2
qrealloc                                              41      42      +1
format                                                 -       1      +1
catv_main                                            313     314      +1
watch_main                                           293     292      -1
varunset                                              81      80      -1
part                                                   1       -      -1
check_if_skip                                        837     836      -1
start_stop_daemon_main                               840     837      -3
create_lost_and_found                                175     172      -3
supress_non_delimited_lines                            4       -      -4
static.l                                               4       -      -4
static.c                                               5       1      -4
bsd_sum_file                                         237     233      -4
eval2                                                338     332      -6
arithmetic_common                                    166     158      -8
cmpfunc                                               22       5     -17
cksum_main                                           294     275     -19
cmp_main                                             465     439     -26
dd_main                                             1535    1508     -27
rmmod_main                                           376     333     -43
cut_file                                             727     644     -83
ipcs_main                                           3809    3721     -88
cut_main                                             722     614    -108
date_main                                           1443    1263    -180
remove_ids                                           222       -    -222
------------------------------------------------------------------------------
(add/remove: 3/4 grow/shrink: 11/18 up/down: 217/-853)       Total: -636 bytes
2006-08-28 23:31:54 +00:00

101 lines
2.5 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 "busybox.h"
#include <signal.h>
int tee_main(int argc, char **argv)
{
const char *mode = "w\0a";
FILE **files;
FILE **p;
char **filenames;
int flags;
int retval = EXIT_SUCCESS;
#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
ssize_t c;
# define buf bb_common_bufsiz1
#else
int c;
#endif
flags = bb_getopt_ulflags(argc, argv, "ia"); /* 'a' must be 2nd */
mode += (flags & 2); /* Since 'a' is the 2nd option... */
if (flags & 1) {
signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction.*/
}
/* 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.*/
/* Allocate an array of FILE *'s, with one extra for a sentinal. */
p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
*p = stdout;
argv += optind - 1;
filenames = argv - 1;
*filenames = (char *) bb_msg_standard_input; /* for later */
goto GOT_NEW_FILE;
do {
if ((*p = bb_wfopen(*argv, mode)) == NULL) {
retval = EXIT_FAILURE;
continue;
}
filenames[(int)(p - files)] = *argv;
GOT_NEW_FILE:
setbuf(*p, NULL); /* tee must not buffer output. */
++p;
} while (*++argv);
*p = NULL; /* Store the sentinal value. */
#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
for (p=files ; *p ; p++) {
fwrite(buf, 1, c, *p);
}
}
if (c < 0) { /* Make sure read errors are signaled. */
retval = EXIT_FAILURE;
}
#else
setvbuf(stdout, NULL, _IONBF, 0);
while ((c = getchar()) != EOF) {
for (p=files ; *p ; p++) {
putc(c, *p);
}
}
#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 bb_fflush_stdout_and_exit()... although fflush()ing
* is unnecessary here. */
p = files;
*p = 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! */
xferror(*p, filenames[(int)(p - files)]);
} while (*++p);
bb_fflush_stdout_and_exit(retval);
}