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/*****************************************************************************/
/*
* snprintpkt.c -- Print an AX.25 packet (with header) into a buffer.
*
* Copyright (C) 1996 Thomas Sailer (sailer@ife.ee.ethz.ch)
* Swiss Federal Institute of Technology (ETH), Electronics Lab
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* This is the Linux realtime sound output driver
*/
/*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include "fpga.h"
/* --------------------------------------------------------------------- */
#define ADDCH(c) \
do { \
if (p + 1 >= endp) \
return -1; \
*p++ = (c); \
} while(0)
#define ADDSTR(s) \
do { \
int l = strlen(s); \
if (p + l >= endp) \
return -1; \
memcpy(p, s, l); \
p += l; \
} while(0)
#ifdef HAVE_SNPRINTF
#define ADDF(fmt, args...) \
do { \
int xlen = snprintf(p, endp-p, fmt, ## args); \
if (xlen < 0) \
return -1; \
p += xlen; \
} while(0)
#else /* HAVE_SNPRINTF */
#define ADDF(fmt, args...) \
do { \
char xbuf[64]; \
int xlen = sprintf(xbuf, fmt, ## args); \
if (p + xlen >= endp) \
return -1; \
memcpy(p, xbuf, xlen); \
p += xlen; \
} while(0)
#endif /* HAVE_SNPRINTF */
int snprintpkt(char *buf, size_t sz, const u_int8_t *pkt, unsigned len)
{
u_int8_t v1=1 , cmd=0;
u_int8_t i, j;
char *p = buf;
char *endp = buf + sz;
if (sz < 2)
return -1;
*buf = 0;
if (!pkt || len < 8)
return 0;
if (pkt[1] & 1) {
/*
* FlexNet Header Compression
*/
v1 = 0;
cmd = (pkt[1] & 2) != 0;
ADDSTR("fm ? to ");
i = (pkt[2] >> 2) & 0x3f;
if (i) {
ADDCH(i+0x20);
}
i = ((pkt[2] << 4) | ((pkt[3] >> 4) & 0xf)) & 0x3f;
if (i) {
ADDCH(i+0x20);
}
i = ((pkt[3] << 2) | ((pkt[4] >> 6) & 3)) & 0x3f;
if (i) {
ADDCH(i+0x20);
}
i = pkt[4] & 0x3f;
if (i) {
ADDCH(i+0x20);
}
i = (pkt[5] >> 2) & 0x3f;
if (i) {
ADDCH(i+0x20);
}
i = ((pkt[5] << 4) | ((pkt[6] >> 4) & 0xf)) & 0x3f;
if (i) {
ADDCH(i+0x20);
}
ADDF("-%u QSO Nr %u", pkt[6] & 0xf, (pkt[0] << 6) | (pkt[1] >> 2));
pkt += 7;
len -= 7;
} else {
/*
* normal header
*/
if (len < 15)
return 0;
if ((pkt[6] & 0x80) != (pkt[13] & 0x80)) {
v1 = 0;
cmd = (pkt[6] & 0x80);
}
ADDSTR("fm ");
for(i = 7; i < 13; i++)
if ((pkt[i] &0xfe) != 0x40) {
ADDCH(pkt[i] >> 1);
}
ADDF("-%u to ", (pkt[13] >> 1) & 0xf);
for(i = 0; i < 6; i++)
if ((pkt[i] &0xfe) != 0x40) {
ADDCH(pkt[i] >> 1);
}
ADDF("-%u", (pkt[6] >> 1) & 0xf);
pkt += 14;
len -= 14;
if ((!(pkt[-1] & 1)) && (len >= 7)) {
ADDSTR(" via ");
}
while ((!(pkt[-1] & 1)) && (len >= 7)) {
for(i = 0; i < 6; i++)
if ((pkt[i] &0xfe) != 0x40) {
ADDCH(pkt[i] >> 1);
}
ADDF("-%u", (pkt[6] >> 1) & 0xf);
pkt += 7;
len -= 7;
if ((!(pkt[-1] & 1)) && (len >= 7)) {
ADDCH(',');
}
}
}
if (!len) {
*p = 0;
return p - buf;
}
i = *pkt++;
len--;
j = v1 ? ((i & 0x10) ? '!' : ' ') :
((i & 0x10) ? (cmd ? '+' : '-') : (cmd ? '^' : 'v'));
if (!(i & 1)) {
/*
* Info frame
*/
ADDF(" I%u%u%c", (i >> 5) & 7, (i >> 1) & 7, j);
} else if (i & 2) {
/*
* U frame
*/
switch (i & (~0x10)) {
case 0x03:
ADDF(" UI%c", j);
break;
case 0x2f:
ADDF(" SABM%c", j);
break;
case 0x43:
ADDF(" DISC%c", j);
break;
case 0x0f:
ADDF(" DM%c", j);
break;
case 0x63:
ADDF(" UA%c", j);
break;
case 0x87:
ADDF(" FRMR%c", j);
break;
default:
ADDF(" unknown U (0x%x)%c", i & (~0x10), j);
break;
}
} else {
/*
* supervisory
*/
switch (i & 0xf) {
case 0x1:
ADDF(" RR%u%c", (i >> 5) & 7, j);
break;
case 0x5:
ADDF(" RNR%u%c", (i >> 5) & 7, j);
break;
case 0x9:
ADDF(" REJ%u%c", (i >> 5) & 7, j);
break;
default:
ADDF(" unknown S (0x%x)%u%c", i & 0xf, (i >> 5) & 7, j);
break;
}
}
if (!len) {
ADDCH('\n');
*p = 0;
return p - buf;
}
ADDF(" pid=%02X\n", *pkt++);
len--;
j = 0;
while (len) {
i = *pkt++;
if ((i >= 32) && (i < 128)) {
ADDCH(i);
}
else if (i == 13) {
if (j) {
ADDCH('\n');
}
j = 0;
} else {
ADDCH('.');
}
if (i >= 32)
j = 1;
len--;
}
if (j) {
ADDCH('\n');
}
*p = 0;
return p - buf;
}
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