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No need to pass checksum to tabby_printer_packet_recv() caller

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This commit is contained in:
XANTRONIX Development 2016-06-02 00:10:57 -05:00
parent a7ba26c6db
commit 7562ab6870
2 changed files with 7 additions and 9 deletions
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3
include/tabby/printer.h
View file

@ -36,8 +36,7 @@ typedef struct _tabby_printer_packet {
*/
int tabby_printer_packet_recv(int fd,
tabby_printer_packet *header,
void *body,
uint16_t *checksum);
void *body);
/*
* For sending printer data packets to a Game Boy Printer

13
src/printer.c
View file

@ -26,8 +26,7 @@ static uint16_t checksum(tabby_printer_packet *header, void *body) {
int tabby_printer_packet_recv(int fd,
tabby_printer_packet *header,
void *body,
uint16_t *sum) {
void *body) {
ssize_t len;
size_t i = 0,
@ -35,9 +34,9 @@ int tabby_printer_packet_recv(int fd,
uint8_t value;
memset(header, '\0', sizeof(*header));
uint16_t sum = 0;
*sum = 0;
memset(header, '\0', sizeof(*header));
while ((len = read(fd, &value, 1)) >= 0) {
if (i == 0) {
@ -72,12 +71,12 @@ int tabby_printer_packet_recv(int fd,
} else if (b < header->size) {
((uint8_t *)body)[b++] = value;
} else if (b == header->size) {
*sum = value;
sum = value;
b++;
} else if (b == header->size + 1) {
*sum |= value << 8;
sum |= value << 8;
if (checksum(header, body) != *sum) {
if (checksum(header, body) != sum) {
errno = EIO;
goto error_io;