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Man, this stuff is kinda hard when the standards are ill-specified

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XANTRONIX 2015-07-12 02:28:31 -05:00
parent fac432cdb4
commit 17dd963f97
1 changed files with 16 additions and 6 deletions
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22
src/kiss.c
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@ -6,13 +6,13 @@ enum kiss_flags {
KISS_ESCAPE = 0x02 KISS_ESCAPE = 0x02
}; };
int patty_kiss_read(int fd, void *buf, size_t *len, int *channel) { ssize_t patty_kiss_read(int fd, void *buf, size_t len, int *port) {
int flags = KISS_NONE; int flags = KISS_NONE;
size_t i, b = 0; size_t i, b = 0;
*channel = 0; *port = 0;
for (i=0; i<PATTY_KISS_BUFLEN; i++) { for (i=0; i<len; i++) {
unsigned char c = ((char *)buf)[i]; unsigned char c = ((char *)buf)[i];
if (flags & KISS_FRAME == 0) { if (flags & KISS_FRAME == 0) {
@ -48,13 +48,23 @@ int patty_kiss_read(int fd, void *buf, size_t *len, int *channel) {
break; break;
} }
/*
* Not all KISS TNCs will emit a type byte at the start of a frame
* to the host; if the low nybble has a value of zero, then presume
* the high nybble to be the radio port number from which the
* packet originated.
*/
if (c & 0x0f == 0) {
*port = (c & 0xf0) >> 4;
continue;
}
((char *)buf)[b++] = c; ((char *)buf)[b++] = c;
} }
} }
*len = b + 1; return b + 1;
return 0;
error_io: error_io:
return -1; return -1;