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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-03-12 23:13:50 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-03-12 23:13:50 +0000
commit4cf1d08fc2e50f9abda999d468c5e972ff4995c2 (patch)
tree58dd8efdd7d0f0990d30d8b5f5f53cf2ee35d444 /miscutils/rx.c
parent4e6d5117b839cef41cd3919966f95bf25d24d8d9 (diff)
downloadbusybox-4cf1d08fc2e50f9abda999d468c5e972ff4995c2.tar.gz
busybox-4cf1d08fc2e50f9abda999d468c5e972ff4995c2.tar.bz2
nc: remove a bit of bloat
inetd: more NOMMU fixes rx: shrink devfsd: minor shrink vlock: shrink tcpudp: narrow down window where we have no wildcard socket parse_one_line 1015 1102 +87 init_ring - 53 +53 xzalloc_lsa - 48 +48 read_byte 51 50 -1 rearm_alarm 28 25 -3 nc_main 1028 1000 -28 initring 53 - -53 vlock_main 583 496 -87 reread_config_file 1089 991 -98 rx_main 1046 912 -134 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 1/6 up/down: 188/-404) Total: -216 bytes text data bss dec hex filename 800120 661 7428 808209 c5511 busybox_old 799796 661 7428 807885 c53cd busybox_unstripped
Diffstat (limited to 'miscutils/rx.c')
-rw-r--r--miscutils/rx.c232
1 files changed, 99 insertions, 133 deletions
diff --git a/miscutils/rx.c b/miscutils/rx.c
index 8ccea4974..9a8fcaa20 100644
--- a/miscutils/rx.c
+++ b/miscutils/rx.c
@@ -16,7 +16,6 @@
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* This was originally written for blob and then adapted for busybox.
- *
*/
#include "libbb.h"
@@ -29,66 +28,59 @@
#define BS 0x08
/*
-
Cf:
-
http://www.textfiles.com/apple/xmodem
http://www.phys.washington.edu/~belonis/xmodem/docxmodem.txt
http://www.phys.washington.edu/~belonis/xmodem/docymodem.txt
http://www.phys.washington.edu/~belonis/xmodem/modmprot.col
-
*/
#define TIMEOUT 1
#define TIMEOUT_LONG 10
#define MAXERRORS 10
-static int read_byte(int fd, unsigned timeout)
+#define read_fd STDIN_FILENO
+#define write_fd STDOUT_FILENO
+
+static int read_byte(unsigned timeout)
{
char buf[1];
int n;
alarm(timeout);
-
- n = read(fd, &buf, 1);
-
+ /* NOT safe_read! We want ALRM to interrupt us */
+ n = read(read_fd, buf, 1);
alarm(0);
-
if (n == 1)
- return buf[0] & 0xff;
- else
- return -1;
+ return (unsigned char)buf[0];
+ return -1;
}
-static int receive(char *error_buf, size_t error_buf_size,
- int ttyfd, int filefd)
+static int receive(/*int read_fd, */int file_fd)
{
- char blockBuf[1024];
- unsigned int errors = 0;
- unsigned int wantBlockNo = 1;
- unsigned int length = 0;
- int docrc = 1;
+ unsigned char blockBuf[1024];
+ unsigned errors = 0;
+ unsigned wantBlockNo = 1;
+ unsigned length = 0;
+ int do_crc = 1;
char nak = 'C';
- unsigned int timeout = TIMEOUT_LONG;
-
-#define note_error(fmt,args...) \
- snprintf(error_buf, error_buf_size, fmt,##args)
+ unsigned timeout = TIMEOUT_LONG;
/* Flush pending input */
- tcflush(ttyfd, TCIFLUSH);
+ tcflush(read_fd, TCIFLUSH);
/* Ask for CRC; if we get errors, we will go with checksum */
- write(ttyfd, &nak, 1);
+ full_write(write_fd, &nak, 1);
for (;;) {
int blockBegin;
int blockNo, blockNoOnesCompl;
int blockLength;
- int cksum = 0;
- int crcHi = 0;
- int crcLo = 0;
+ int cksum_crc; /* cksum OR crc */
+ int expected;
+ int i,j;
- blockBegin = read_byte(ttyfd, timeout);
+ blockBegin = read_byte(timeout);
if (blockBegin < 0)
goto timeout;
@@ -102,52 +94,47 @@ static int receive(char *error_buf, size_t error_buf_size,
case EOT:
nak = ACK;
- write(ttyfd, &nak, 1);
- goto done;
+ full_write(write_fd, &nak, 1);
+ return length;
default:
goto error;
}
/* block no */
- blockNo = read_byte(ttyfd, TIMEOUT);
+ blockNo = read_byte(TIMEOUT);
if (blockNo < 0)
goto timeout;
/* block no one's compliment */
- blockNoOnesCompl = read_byte(ttyfd, TIMEOUT);
+ blockNoOnesCompl = read_byte(TIMEOUT);
if (blockNoOnesCompl < 0)
goto timeout;
if (blockNo != (255 - blockNoOnesCompl)) {
- note_error("bad block ones compl");
+ bb_error_msg("bad block ones compl");
goto error;
}
blockLength = (blockBegin == SOH) ? 128 : 1024;
- {
- int i;
-
- for (i = 0; i < blockLength; i++) {
- int cc = read_byte(ttyfd, TIMEOUT);
- if (cc < 0)
- goto timeout;
- blockBuf[i] = cc;
- }
+ for (i = 0; i < blockLength; i++) {
+ int cc = read_byte(TIMEOUT);
+ if (cc < 0)
+ goto timeout;
+ blockBuf[i] = cc;
}
- if (docrc) {
- crcHi = read_byte(ttyfd, TIMEOUT);
- if (crcHi < 0)
+ if (do_crc) {
+ cksum_crc = read_byte(TIMEOUT);
+ if (cksum_crc < 0)
goto timeout;
-
- crcLo = read_byte(ttyfd, TIMEOUT);
- if (crcLo < 0)
+ cksum_crc = (cksum_crc << 8) | read_byte(TIMEOUT);
+ if (cksum_crc < 0)
goto timeout;
} else {
- cksum = read_byte(ttyfd, TIMEOUT);
- if (cksum < 0)
+ cksum_crc = read_byte(TIMEOUT);
+ if (cksum_crc < 0)
goto timeout;
}
@@ -156,93 +143,74 @@ static int receive(char *error_buf, size_t error_buf_size,
/* this also ignores the initial block 0 which is */
/* meta data. */
goto next;
- } else if (blockNo != (wantBlockNo & 0xff)) {
- note_error("unexpected block no, 0x%08x, expecting 0x%08x", blockNo, wantBlockNo);
+ }
+ if (blockNo != (wantBlockNo & 0xff)) {
+ bb_error_msg("unexpected block no, 0x%08x, expecting 0x%08x", blockNo, wantBlockNo);
goto error;
}
- if (docrc) {
- int crc = 0;
- int i, j;
- int expectedCrcHi;
- int expectedCrcLo;
-
+ expected = 0;
+ if (do_crc) {
for (i = 0; i < blockLength; i++) {
- crc = crc ^ (int) blockBuf[i] << 8;
- for (j = 0; j < 8; j++)
- if (crc & 0x8000)
- crc = crc << 1 ^ 0x1021;
+ expected = expected ^ blockBuf[i] << 8;
+ for (j = 0; j < 8; j++) {
+ if (expected & 0x8000)
+ expected = expected << 1 ^ 0x1021;
else
- crc = crc << 1;
- }
-
- expectedCrcHi = (crc >> 8) & 0xff;
- expectedCrcLo = crc & 0xff;
-
- if ((crcHi != expectedCrcHi) ||
- (crcLo != expectedCrcLo)) {
- note_error("crc error, expected 0x%02x 0x%02x, got 0x%02x 0x%02x", expectedCrcHi, expectedCrcLo, crcHi, crcLo);
- goto error;
+ expected = expected << 1;
+ }
}
+ expected &= 0xffff;
} else {
- unsigned char expectedCksum = 0;
- int i;
-
for (i = 0; i < blockLength; i++)
- expectedCksum += blockBuf[i];
-
- if (cksum != expectedCksum) {
- note_error("checksum error, expected 0x%02x, got 0x%02x", expectedCksum, cksum);
- goto error;
- }
+ expected += blockBuf[i];
+ expected &= 0xff;
+ }
+ if (cksum_crc != expected) {
+ bb_error_msg(do_crc ? "crc error, expected 0x%04x, got 0x%04x"
+ : "checksum error, expected 0x%02x, got 0x%02x",
+ expected, cksum_crc);
+ goto error;
}
wantBlockNo++;
length += blockLength;
- if (full_write(filefd, blockBuf, blockLength) < 0) {
- note_error("write to file failed: %m");
+ errno = 0;
+ if (full_write(file_fd, blockBuf, blockLength) != blockLength) {
+ bb_perror_msg("can't write to file");
goto fatal;
}
-
- next:
+ next:
errors = 0;
nak = ACK;
- write(ttyfd, &nak, 1);
+ full_write(write_fd, &nak, 1);
continue;
-
- error:
- timeout:
+ error:
+ timeout:
errors++;
if (errors == MAXERRORS) {
/* Abort */
- // if using crc, try again w/o crc
+ /* if were asking for crc, try again w/o crc */
if (nak == 'C') {
nak = NAK;
errors = 0;
- docrc = 0;
+ do_crc = 0;
goto timeout;
}
-
- note_error("too many errors; giving up");
-
- fatal:
- /* 5 CAN followed by 5 BS */
- write(ttyfd, "\030\030\030\030\030\010\010\010\010\010", 10);
+ bb_error_msg("too many errors; giving up");
+ fatal:
+ /* 5 CAN followed by 5 BS. Don't try too hard... */
+ safe_write(write_fd, "\030\030\030\030\030\010\010\010\010\010", 10);
return -1;
}
/* Flush pending input */
- tcflush(ttyfd, TCIFLUSH);
-
- write(ttyfd, &nak, 1);
- }
-
- done:
- return length;
+ tcflush(read_fd, TCIFLUSH);
-#undef note_error
+ full_write(write_fd, &nak, 1);
+ } /* for (;;) */
}
static void sigalrm_handler(int ATTRIBUTE_UNUSED signum)
@@ -252,40 +220,38 @@ static void sigalrm_handler(int ATTRIBUTE_UNUSED signum)
int rx_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int rx_main(int argc, char **argv)
{
- char *fn;
- int ttyfd, filefd;
- struct termios tty, orig_tty;
struct sigaction act;
+ struct termios tty, orig_tty;
+ int termios_err;
+ int file_fd;
int n;
- char error_buf[256];
if (argc != 2)
- bb_show_usage();
-
- fn = argv[1];
- ttyfd = xopen(CURRENT_TTY, O_RDWR);
- filefd = xopen(fn, O_RDWR|O_CREAT|O_TRUNC);
-
- if (tcgetattr(ttyfd, &tty) < 0)
- bb_perror_msg_and_die("tcgetattr");
-
- orig_tty = tty;
-
- cfmakeraw(&tty);
- tcsetattr(ttyfd, TCSAFLUSH, &tty);
+ bb_show_usage();
+
+ /* Disabled by vda:
+ * why we can't receive from stdin? Why we *require*
+ * controlling tty?? */
+ /*read_fd = xopen(CURRENT_TTY, O_RDWR);*/
+ file_fd = xopen(argv[1], O_RDWR|O_CREAT|O_TRUNC);
+
+ termios_err = tcgetattr(read_fd, &tty);
+ if (termios_err == 0) {
+ orig_tty = tty;
+ cfmakeraw(&tty);
+ tcsetattr(read_fd, TCSAFLUSH, &tty);
+ }
+ /* No SA_RESTART: we want ALRM to interrupt read() */
memset(&act, 0, sizeof(act));
act.sa_handler = sigalrm_handler;
- sigaction(SIGALRM, &act, 0);
-
- n = receive(error_buf, sizeof(error_buf), ttyfd, filefd);
-
- close(filefd);
-
- tcsetattr(ttyfd, TCSAFLUSH, &orig_tty);
+ sigaction(SIGALRM, &act, NULL);
- if (n < 0)
- bb_error_msg_and_die("\nreceive failed:\n %s", error_buf);
+ n = receive(file_fd);
- fflush_stdout_and_exit(EXIT_SUCCESS);
+ if (termios_err == 0)
+ tcsetattr(read_fd, TCSAFLUSH, &orig_tty);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(file_fd);
+ fflush_stdout_and_exit(n >= 0);
}