ACC X.25 Protocol User's Guide

X.25 Application Programming
ZX25CALLACC (3X) — ACC X.25
Chapter 4 89
NOTES 1. The X.121 call address consists of 8 bytes, and it is used a a 15-digit
BCD number plus a length digit in the last position. For example, in
hex:
DD DD DD DD DD DD DD DL
where D is a 4-bit BCD digit, whose range is from 0 to 9
L is a 4-bit length digit, whose range is from 1 to 15
The 15 address digits should be left-justified and without leading
zero. The length digit indicates the number of address digits. For
example, to specify addresses “1773648” and “123456789012”, the
hex values of the address buffer should be:
17 73 64 8X XX XX XX X7 for 1773648
12 34 56 78 90 12 XX XC for 123456789012
where X is unused digit (normally should be set to zero).
2. The calling program (or thread) must call zx25info before calling this
routine. In a multi-threaded application, each thread must make a
separate call to zx25info using a per-thread ZCOM X.25 access data
buffer zxip. The per-thread data buffer can then be used to call this
routine.
EXAMPLE
#include<zcom/zcomsys.h>
#include<zcom/zcomx25.h>
int ierr;
zx25info_type zxi;
zaddr_type vzaddr;
char fbuf[size]; /* user-defined size */
int flen;
char ubuf[size]; /* user-defined size */
int ulen;
int dbit;
unsigned char clngaddr[8]; /* user-defined size */
unsigned char caldaddr[8]; /* user-defined size */
if (ierr = zx25callacc (&zxi, &vzaddr, fbuf, flen, ubuf,
ulen, dbit, clngaddr, caldaddr)) {
/* error return code */
}
else {
/* good return code */
}