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Implement tabby_printer_packet_send()

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This commit is contained in:
XANTRONIX Development 2016-06-01 23:56:00 -05:00
parent 4e3d8073b5
commit 8e460b56ea
2 changed files with 41 additions and 3 deletions
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13
include/tabby/printer.h
View file

@ -32,10 +32,19 @@ typedef struct _tabby_printer_packet {
} tabby_printer_packet;
/*
* Methods for communicating with Game Boy as a printer
* For receiving printer data packets from a Game Boy Camera
*/
int tabby_printer_packet_recv(int fd, tabby_printer_packet *header,
int tabby_printer_packet_recv(int fd,
tabby_printer_packet *header,
void *body,
uint16_t *checksum);
/*
* For sending printer data packets to a Game Boy Printer
*/
int tabby_printer_packet_send(int fd,
tabby_printer_packet *header,
void *body,
uint16_t *response);
#endif /* _TABBY_PRINTER_H */

31
src/printer.c
View file

@ -24,7 +24,8 @@ static uint16_t checksum(tabby_printer_packet *header, void *body) {
return checksum;
}
int tabby_printer_packet_recv(int fd, tabby_printer_packet *header,
int tabby_printer_packet_recv(int fd,
tabby_printer_packet *header,
void *body,
uint16_t *sum) {
ssize_t len;
@ -89,3 +90,31 @@ int tabby_printer_packet_recv(int fd, tabby_printer_packet *header,
error_io:
return -errno;
}
int tabby_printer_packet_send(int fd,
tabby_printer_packet *header,
void *body,
uint16_t *response) {
uint16_t sum = checksum(header, body);
if (write(fd, header, sizeof(*header)) < 0) {
goto error_io;
}
if (write(fd, body, header->size) < 0) {
goto error_io;
}
if (write(fd, &sum, sizeof(sum)) < 0) {
goto error_io;
}
if (read(fd, response, sizeof(response)) < 0) {
goto error_io;
}
return 0;
error_io:
return -1;
}