diff options
| -rw-r--r-- | miscutils/rx.c | 42 |
1 files changed, 13 insertions, 29 deletions
diff --git a/miscutils/rx.c b/miscutils/rx.c index 7642094..cff5a62 100644 --- a/miscutils/rx.c +++ b/miscutils/rx.c @@ -39,7 +39,6 @@ #define EOT 0x04 #define ACK 0x06 #define NAK 0x15 -#define CAN 0x18 #define BS 0x08 /* @@ -57,18 +56,6 @@ Cf: #define TIMEOUT_LONG 10 #define MAXERRORS 10 -static inline void write_byte(int fd, char cc) { - write(fd, &cc, 1); -} - -static inline void write_flush(int fd) { - tcdrain(fd); -} - -static inline void read_flush(int fd) { - tcflush(fd, TCIFLUSH); -} - static int read_byte(int fd, unsigned int timeout) { char buf[1]; int n; @@ -99,11 +86,11 @@ static int receive(char *error_buf, size_t error_buf_size, #define note_error(fmt,args...) \ snprintf(error_buf, error_buf_size, fmt,##args) - read_flush(ttyfd); + /* Flush pending input */ + tcflush(ttyfd, TCIFLUSH); /* Ask for CRC; if we get errors, we will go with checksum */ - write_byte(ttyfd, nak); - write_flush(ttyfd); + write(ttyfd, &nak, 1); for (;;) { int blockBegin; @@ -126,8 +113,8 @@ static int receive(char *error_buf, size_t error_buf_size, break; case EOT: - write_byte(ttyfd, ACK); - write_flush(ttyfd); + nak = ACK; + write(ttyfd, &nak, 1); goto done; default: @@ -232,8 +219,8 @@ static int receive(char *error_buf, size_t error_buf_size, next: errors = 0; - write_byte(ttyfd, ACK); - write_flush(ttyfd); + nak = ACK; + write(ttyfd, &nak, 1); continue; error: @@ -241,7 +228,6 @@ static int receive(char *error_buf, size_t error_buf_size, errors++; if (errors == MAXERRORS) { /* Abort */ - int i; // if using crc, try again w/o crc if (nak == 'C') { @@ -254,17 +240,15 @@ static int receive(char *error_buf, size_t error_buf_size, note_error("too many errors; giving up"); fatal: - for (i = 0; i < 5; i ++) - write_byte(ttyfd, CAN); - for (i = 0; i < 5; i ++) - write_byte(ttyfd, BS); - write_flush(ttyfd); + /* 5 CAN followed by 5 BS */ + write(ttyfd, "\030\030\030\030\030\010\010\010\010\010", 10); return -1; } - read_flush(ttyfd); - write_byte(ttyfd, nak); - write_flush(ttyfd); + /* Flush pending input */ + tcflush(ttyfd, TCIFLUSH); + + write(ttyfd, &nak, 1); } done: |