4.3BSD-Reno/src/libexec/telnetd/utility.c
/*
* Copyright (c) 1989 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)utility.c 5.4 (Berkeley) 6/28/90";
#endif /* not lint */
#define PRINTOPTIONS
#include "telnetd.h"
/*
* utility functions performing io related tasks
*/
/*
* ttloop
*
* A small subroutine to flush the network output buffer, get some data
* from the network, and pass it through the telnet state machine. We
* also flush the pty input buffer (by dropping its data) if it becomes
* too full.
*/
void
ttloop()
{
void netflush();
#ifdef DIAGNOSTICS
if (diagnostic & TD_REPORT) {
sprintf(nfrontp, "td: ttloop\r\n");
nfrontp += strlen(nfrontp);
}
#endif /* DIAGNOSTICS */
if (nfrontp-nbackp) {
netflush();
}
ncc = read(net, netibuf, sizeof netibuf);
if (ncc < 0) {
syslog(LOG_INFO, "ttloop: read: %m\n");
exit(1);
} else if (ncc == 0) {
syslog(LOG_INFO, "ttloop: peer died: %m\n");
exit(1);
}
#ifdef DIAGNOSTICS
if (diagnostic & TD_REPORT) {
sprintf(nfrontp, "td: ttloop read %d chars\r\n", ncc);
nfrontp += strlen(nfrontp);
}
#endif /* DIAGNOSTICS */
netip = netibuf;
telrcv(); /* state machine */
if (ncc > 0) {
pfrontp = pbackp = ptyobuf;
telrcv();
}
} /* end of ttloop */
/*
* Check a descriptor to see if out of band data exists on it.
*/
stilloob(s)
int s; /* socket number */
{
static struct timeval timeout = { 0 };
fd_set excepts;
int value;
do {
FD_ZERO(&excepts);
FD_SET(s, &excepts);
value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
} while ((value == -1) && (errno == EINTR));
if (value < 0) {
fatalperror(pty, "select");
}
if (FD_ISSET(s, &excepts)) {
return 1;
} else {
return 0;
}
}
ptyflush()
{
int n;
if ((n = pfrontp - pbackp) > 0) {
#ifdef DIAGNOSTICS
if (diagnostic & (TD_REPORT | TD_PTYDATA)) {
sprintf(nfrontp, "td: ptyflush %d chars\r\n", n);
nfrontp += strlen(nfrontp);
}
if (diagnostic & TD_PTYDATA) {
printdata("pd", pbackp, n);
}
#endif /* DIAGNOSTICS */
n = write(pty, pbackp, n);
}
if (n < 0)
return;
pbackp += n;
if (pbackp == pfrontp)
pbackp = pfrontp = ptyobuf;
}
/*
* nextitem()
*
* Return the address of the next "item" in the TELNET data
* stream. This will be the address of the next character if
* the current address is a user data character, or it will
* be the address of the character following the TELNET command
* if the current address is a TELNET IAC ("I Am a Command")
* character.
*/
char *
nextitem(current)
char *current;
{
if ((*current&0xff) != IAC) {
return current+1;
}
switch (*(current+1)&0xff) {
case DO:
case DONT:
case WILL:
case WONT:
return current+3;
case SB: /* loop forever looking for the SE */
{
register char *look = current+2;
for (;;) {
if ((*look++&0xff) == IAC) {
if ((*look++&0xff) == SE) {
return look;
}
}
}
}
default:
return current+2;
}
} /* end of nextitem */
/*
* netclear()
*
* We are about to do a TELNET SYNCH operation. Clear
* the path to the network.
*
* Things are a bit tricky since we may have sent the first
* byte or so of a previous TELNET command into the network.
* So, we have to scan the network buffer from the beginning
* until we are up to where we want to be.
*
* A side effect of what we do, just to keep things
* simple, is to clear the urgent data pointer. The principal
* caller should be setting the urgent data pointer AFTER calling
* us in any case.
*/
netclear()
{
register char *thisitem, *next;
char *good;
#define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
thisitem = netobuf;
while ((next = nextitem(thisitem)) <= nbackp) {
thisitem = next;
}
/* Now, thisitem is first before/at boundary. */
good = netobuf; /* where the good bytes go */
while (nfrontp > thisitem) {
if (wewant(thisitem)) {
int length;
next = thisitem;
do {
next = nextitem(next);
} while (wewant(next) && (nfrontp > next));
length = next-thisitem;
bcopy(thisitem, good, length);
good += length;
thisitem = next;
} else {
thisitem = nextitem(thisitem);
}
}
nbackp = netobuf;
nfrontp = good; /* next byte to be sent */
neturg = 0;
} /* end of netclear */
/*
* netflush
* Send as much data as possible to the network,
* handling requests for urgent data.
*/
void
netflush()
{
int n;
extern int not42;
if ((n = nfrontp - nbackp) > 0) {
#ifdef DIAGNOSTICS
if (diagnostic & TD_REPORT) {
sprintf(nfrontp, "td: netflush %d chars\r\n", n);
n += strlen(nfrontp); /* get count first */
nfrontp += strlen(nfrontp); /* then move pointer */
}
#endif /* DIAGNOSTICS */
/*
* if no urgent data, or if the other side appears to be an
* old 4.2 client (and thus unable to survive TCP urgent data),
* write the entire buffer in non-OOB mode.
*/
if ((neturg == 0) || (not42 == 0)) {
n = write(net, nbackp, n); /* normal write */
} else {
n = neturg - nbackp;
/*
* In 4.2 (and 4.3) systems, there is some question about
* what byte in a sendOOB operation is the "OOB" data.
* To make ourselves compatible, we only send ONE byte
* out of band, the one WE THINK should be OOB (though
* we really have more the TCP philosophy of urgent data
* rather than the Unix philosophy of OOB data).
*/
if (n > 1) {
n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */
} else {
n = send(net, nbackp, n, MSG_OOB); /* URGENT data */
}
}
}
if (n < 0) {
if (errno == EWOULDBLOCK || errno == EINTR)
return;
cleanup();
}
nbackp += n;
if (nbackp >= neturg) {
neturg = 0;
}
if (nbackp == nfrontp) {
nbackp = nfrontp = netobuf;
}
return;
} /* end of netflush */
/*
* writenet
*
* Just a handy little function to write a bit of raw data to the net.
* It will force a transmit of the buffer if necessary
*
* arguments
* ptr - A pointer to a character string to write
* len - How many bytes to write
*/
writenet(ptr, len)
register char *ptr;
register int len;
{
/* flush buffer if no room for new data) */
if ((&netobuf[BUFSIZ] - nfrontp) < len) {
/* if this fails, don't worry, buffer is a little big */
netflush();
}
bcopy(ptr, nfrontp, len);
nfrontp += len;
} /* end of writenet */
/*
* miscellaneous functions doing a variety of little jobs follow ...
*/
fatal(f, msg)
int f;
char *msg;
{
char buf[BUFSIZ];
(void) sprintf(buf, "telnetd: %s.\r\n", msg);
(void) write(f, buf, (int)strlen(buf));
sleep(1); /*XXX*/
exit(1);
}
fatalperror(f, msg)
int f;
char *msg;
{
char buf[BUFSIZ], *strerror();
(void) sprintf(buf, "%s: %s\r\n", msg, strerror(errno));
fatal(f, buf);
}
char editedhost[32];
edithost(pat, host)
register char *pat;
register char *host;
{
register char *res = editedhost;
char *strncpy();
if (!pat)
pat = "";
while (*pat) {
switch (*pat) {
case '#':
if (*host)
host++;
break;
case '@':
if (*host)
*res++ = *host++;
break;
default:
*res++ = *pat;
break;
}
if (res == &editedhost[sizeof editedhost - 1]) {
*res = '\0';
return;
}
pat++;
}
if (*host)
(void) strncpy(res, host,
sizeof editedhost - (res - editedhost) -1);
else
*res = '\0';
editedhost[sizeof editedhost - 1] = '\0';
}
static char *putlocation;
putstr(s)
register char *s;
{
while (*s)
putchr(*s++);
}
putchr(cc)
{
*putlocation++ = cc;
}
putf(cp, where)
register char *cp;
char *where;
{
char *slash;
#ifndef NO_GETTYTAB
char datebuffer[60];
#endif /* NO_GETTYTAB */
extern char *rindex();
putlocation = where;
while (*cp) {
if (*cp != '%') {
putchr(*cp++);
continue;
}
switch (*++cp) {
case 't':
slash = rindex(line, '/');
if (slash == (char *) 0)
putstr(line);
else
putstr(&slash[1]);
break;
case 'h':
putstr(editedhost);
break;
#ifndef NO_GETTYTAB
case 'd':
get_date(datebuffer);
putstr(datebuffer);
break;
#endif /* NO_GETTYTAB */
case '%':
putchr('%');
break;
}
cp++;
}
}
/*ARGSUSED*/
#ifdef NO_GETTYTAB
getent(cp, name)
char *cp, *name;
{
return(0);
}
/*ARGSUSED*/
char *
getstr(cp, cpp)
char *cp, **cpp;
{
return(0);
}
#endif /* NO_GETTYTAB */
#ifdef DIAGNOSTICS
/*
* Print telnet options and commands in plain text, if possible.
*/
void
printoption(fmt, option)
register char *fmt;
register int option;
{
if (TELOPT_OK(option))
sprintf(nfrontp, "%s %s\r\n", fmt, TELOPT(option));
else if (TELCMD_OK(option))
sprintf(nfrontp, "%s %s\r\n", fmt, TELCMD(option));
else
sprintf(nfrontp, "%s %d\r\n", fmt, option);
nfrontp += strlen(nfrontp);
return;
}
char *slcnames[] = { SLC_NAMES };
void
printsub(dirp, pointer, length)
char *dirp;
unsigned char *pointer; /* where suboption data sits */
int length; /* length of suboption data */
{
register int i;
if (dirp) {
sprintf(nfrontp, "%s suboption ", dirp);
nfrontp += strlen(nfrontp);
if (length >= 3) {
register int j;
i = pointer[length-2];
j = pointer[length-1];
if (i != IAC || j != SE) {
sprintf(nfrontp, "(terminated by ");
nfrontp += strlen(nfrontp);
if (TELOPT_OK(i))
sprintf(nfrontp, "%s ", TELOPT(i));
else if (TELCMD_OK(i))
sprintf(nfrontp, "%s ", TELCMD(i));
else
sprintf(nfrontp, "%d ", i);
nfrontp += strlen(nfrontp);
if (TELOPT_OK(j))
sprintf(nfrontp, "%s", TELOPT(j));
else if (TELCMD_OK(j))
sprintf(nfrontp, "%s", TELCMD(j));
else
sprintf(nfrontp, "%d", j);
nfrontp += strlen(nfrontp);
sprintf(nfrontp, ", not IAC SE!) ");
nfrontp += strlen(nfrontp);
}
}
length -= 2;
}
if (length < 1) {
sprintf(nfrontp, "(Empty suboption???)");
nfrontp += strlen(nfrontp);
return;
}
switch (pointer[0]) {
case TELOPT_TTYPE:
sprintf(nfrontp, "TERMINAL-TYPE ");
nfrontp += strlen(nfrontp);
switch (pointer[1]) {
case TELQUAL_IS:
sprintf(nfrontp, "IS \"%.*s\"", length-2, (char *)pointer+2);
break;
case TELQUAL_SEND:
sprintf(nfrontp, "SEND");
break;
default:
sprintf(nfrontp,
"- unknown qualifier %d (0x%x).",
pointer[1], pointer[1]);
}
nfrontp += strlen(nfrontp);
break;
case TELOPT_TSPEED:
sprintf(nfrontp, "TERMINAL-SPEED");
nfrontp += strlen(nfrontp);
if (length < 2) {
sprintf(nfrontp, " (empty suboption???)");
nfrontp += strlen(nfrontp);
break;
}
switch (pointer[1]) {
case TELQUAL_IS:
sprintf(nfrontp, " IS %.*s", length-2, (char *)pointer+2);
nfrontp += strlen(nfrontp);
break;
default:
if (pointer[1] == 1)
sprintf(nfrontp, " SEND");
else
sprintf(nfrontp, " %d (unknown)", pointer[1]);
nfrontp += strlen(nfrontp);
for (i = 2; i < length; i++) {
sprintf(nfrontp, " ?%d?", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
}
break;
case TELOPT_LFLOW:
sprintf(nfrontp, "TOGGLE-FLOW-CONTROL");
nfrontp += strlen(nfrontp);
if (length < 2) {
sprintf(nfrontp, " (empty suboption???)");
nfrontp += strlen(nfrontp);
break;
}
switch (pointer[1]) {
case 0:
sprintf(nfrontp, " OFF"); break;
case 1:
sprintf(nfrontp, " ON"); break;
default:
sprintf(nfrontp, " %d (unknown)", pointer[1]);
}
nfrontp += strlen(nfrontp);
for (i = 2; i < length; i++) {
sprintf(nfrontp, " ?%d?", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
case TELOPT_NAWS:
sprintf(nfrontp, "NAWS");
nfrontp += strlen(nfrontp);
if (length < 2) {
sprintf(nfrontp, " (empty suboption???)");
nfrontp += strlen(nfrontp);
break;
}
if (length == 2) {
sprintf(nfrontp, " ?%d?", pointer[1]);
nfrontp += strlen(nfrontp);
break;
}
sprintf(nfrontp, " %d %d (%d)",
pointer[1], pointer[2],
(int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
nfrontp += strlen(nfrontp);
if (length == 4) {
sprintf(nfrontp, " ?%d?", pointer[3]);
nfrontp += strlen(nfrontp);
break;
}
sprintf(nfrontp, " %d %d (%d)",
pointer[3], pointer[4],
(int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
nfrontp += strlen(nfrontp);
for (i = 5; i < length; i++) {
sprintf(nfrontp, " ?%d?", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
case TELOPT_LINEMODE:
sprintf(nfrontp, "LINEMODE ");
nfrontp += strlen(nfrontp);
if (length < 2) {
sprintf(nfrontp, " (empty suboption???)");
nfrontp += strlen(nfrontp);
break;
}
switch (pointer[1]) {
case WILL:
sprintf(nfrontp, "WILL ");
goto common;
case WONT:
sprintf(nfrontp, "WONT ");
goto common;
case DO:
sprintf(nfrontp, "DO ");
goto common;
case DONT:
sprintf(nfrontp, "DONT ");
common:
nfrontp += strlen(nfrontp);
if (length < 3) {
sprintf(nfrontp, "(no option???)");
nfrontp += strlen(nfrontp);
break;
}
switch (pointer[2]) {
case LM_FORWARDMASK:
sprintf(nfrontp, "Forward Mask");
nfrontp += strlen(nfrontp);
for (i = 3; i < length; i++) {
sprintf(nfrontp, " %x", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
default:
sprintf(nfrontp, "%d (unknown)", pointer[2]);
nfrontp += strlen(nfrontp);
for (i = 3; i < length; i++) {
sprintf(nfrontp, " %d", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
}
break;
case LM_SLC:
sprintf(nfrontp, "SLC");
nfrontp += strlen(nfrontp);
for (i = 2; i < length - 2; i += 3) {
if (pointer[i+SLC_FUNC] <= NSLC)
sprintf(nfrontp, " %s", slcnames[pointer[i+SLC_FUNC]]);
else
sprintf(nfrontp, " %d", pointer[i+SLC_FUNC]);
nfrontp += strlen(nfrontp);
switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
case SLC_NOSUPPORT:
sprintf(nfrontp, " NOSUPPORT"); break;
case SLC_CANTCHANGE:
sprintf(nfrontp, " CANTCHANGE"); break;
case SLC_VARIABLE:
sprintf(nfrontp, " VARIABLE"); break;
case SLC_DEFAULT:
sprintf(nfrontp, " DEFAULT"); break;
}
nfrontp += strlen(nfrontp);
sprintf(nfrontp, "%s%s%s",
pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
nfrontp += strlen(nfrontp);
if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
SLC_FLUSHOUT| SLC_LEVELBITS)) {
sprintf(nfrontp, "(0x%x)", pointer[i+SLC_FLAGS]);
nfrontp += strlen(nfrontp);
}
sprintf(nfrontp, " %d;", pointer[i+SLC_VALUE]);
nfrontp += strlen(nfrontp);
if ((pointer[i+SLC_VALUE] == IAC) &&
(pointer[i+SLC_VALUE+1] == IAC))
i++;
}
for (; i < length; i++) {
sprintf(nfrontp, " ?%d?", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
case LM_MODE:
sprintf(nfrontp, "MODE ");
nfrontp += strlen(nfrontp);
if (length < 3) {
sprintf(nfrontp, "(no mode???)");
nfrontp += strlen(nfrontp);
break;
}
{
char tbuf[32];
sprintf(tbuf, "%s%s%s%s%s",
pointer[2]&MODE_EDIT ? "|EDIT" : "",
pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
pointer[2]&MODE_ACK ? "|ACK" : "");
sprintf(nfrontp, "%s", tbuf[1] ? &tbuf[1] : "0");
nfrontp += strlen(nfrontp);
}
if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
sprintf(nfrontp, " (0x%x)", pointer[2]);
nfrontp += strlen(nfrontp);
}
for (i = 3; i < length; i++) {
sprintf(nfrontp, " ?0x%x?", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
default:
sprintf(nfrontp, "%d (unknown)", pointer[1]);
nfrontp += strlen(nfrontp);
for (i = 2; i < length; i++) {
sprintf(nfrontp, " %d", pointer[i]);
nfrontp += strlen(nfrontp);
}
}
break;
case TELOPT_STATUS: {
register char *cp;
register int j, k;
sprintf(nfrontp, "STATUS");
nfrontp += strlen(nfrontp);
switch (pointer[1]) {
default:
if (pointer[1] == TELQUAL_SEND)
sprintf(nfrontp, " SEND");
else
sprintf(nfrontp, " %d (unknown)", pointer[1]);
nfrontp += strlen(nfrontp);
for (i = 2; i < length; i++) {
sprintf(nfrontp, " ?%d?", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
case TELQUAL_IS:
sprintf(nfrontp, " IS\r\n");
nfrontp += strlen(nfrontp);
for (i = 2; i < length; i++) {
switch(pointer[i]) {
case DO: cp = "DO"; goto common2;
case DONT: cp = "DONT"; goto common2;
case WILL: cp = "WILL"; goto common2;
case WONT: cp = "WONT"; goto common2;
common2:
i++;
if (TELOPT_OK((int)pointer[i]))
sprintf(nfrontp, " %s %s", cp, TELOPT(pointer[i]));
else
sprintf(nfrontp, " %s %d", cp, pointer[i]);
nfrontp += strlen(nfrontp);
sprintf(nfrontp, "\r\n");
nfrontp += strlen(nfrontp);
break;
case SB:
sprintf(nfrontp, " SB ");
nfrontp += strlen(nfrontp);
i++;
j = k = i;
while (j < length) {
if (pointer[j] == SE) {
if (j+1 == length)
break;
if (pointer[j+1] == SE)
j++;
else
break;
}
pointer[k++] = pointer[j++];
}
printsub(0, &pointer[i], k - i);
if (i < length) {
sprintf(nfrontp, " SE");
nfrontp += strlen(nfrontp);
i = j;
} else
i = j - 1;
sprintf(nfrontp, "\r\n");
nfrontp += strlen(nfrontp);
break;
default:
sprintf(nfrontp, " %d", pointer[i]);
nfrontp += strlen(nfrontp);
break;
}
}
break;
}
break;
}
case TELOPT_XDISPLOC:
sprintf(nfrontp, "X-DISPLAY-LOCATION ");
nfrontp += strlen(nfrontp);
switch (pointer[1]) {
case TELQUAL_IS:
sprintf(nfrontp, "IS \"%.*s\"", length-2, (char *)pointer+2);
break;
case TELQUAL_SEND:
sprintf(nfrontp, "SEND");
break;
default:
sprintf(nfrontp, "- unknown qualifier %d (0x%x).",
pointer[1], pointer[1]);
}
nfrontp += strlen(nfrontp);
break;
case TELOPT_ENVIRON:
sprintf(nfrontp, "ENVIRON ");
nfrontp += strlen(nfrontp);
switch (pointer[1]) {
case TELQUAL_IS:
sprintf(nfrontp, "IS ");
goto env_common;
case TELQUAL_SEND:
sprintf(nfrontp, "SEND ");
goto env_common;
case TELQUAL_INFO:
sprintf(nfrontp, "INFO ");
env_common:
nfrontp += strlen(nfrontp);
{
register int noquote = 2;
for (i = 2; i < length; i++ ) {
switch (pointer[i]) {
case ENV_VAR:
if (pointer[1] == TELQUAL_SEND)
goto def_case;
sprintf(nfrontp, "\" VAR " + noquote);
nfrontp += strlen(nfrontp);
noquote = 2;
break;
case ENV_VALUE:
sprintf(nfrontp, "\" VALUE " + noquote);
nfrontp += strlen(nfrontp);
noquote = 2;
break;
case ENV_ESC:
sprintf(nfrontp, "\" ESC " + noquote);
nfrontp += strlen(nfrontp);
noquote = 2;
break;
default:
def_case:
if (isprint(pointer[i]) && pointer[i] != '"') {
if (noquote) {
*nfrontp++ = '"';
noquote = 0;
}
*nfrontp++ = pointer[i];
} else {
sprintf(nfrontp, "\" %03o " + noquote,
pointer[i]);
nfrontp += strlen(nfrontp);
noquote = 2;
}
break;
}
}
if (!noquote)
*nfrontp++ = '"';
break;
}
}
break;
default:
sprintf(nfrontp, "Unknown option ");
nfrontp += strlen(nfrontp);
for (i = 0; i < length; i++) {
sprintf(nfrontp, " %d", pointer[i]);
nfrontp += strlen(nfrontp);
}
break;
}
sprintf(nfrontp, "\r\n");
nfrontp += strlen(nfrontp);
}
/*
* Dump a data buffer in hex and ascii to the output data stream.
*/
void
printdata(tag, ptr, cnt)
register char *tag;
register char *ptr;
register int cnt;
{
register int i;
char xbuf[30];
while (cnt) {
/* flush net output buffer if no room for new data) */
if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
netflush();
}
/* add a line of output */
sprintf(nfrontp, "%s: ", tag);
nfrontp += strlen(nfrontp);
for (i = 0; i < 20 && cnt; i++) {
sprintf(nfrontp, "%02x", *ptr);
nfrontp += strlen(nfrontp);
if (isprint(*ptr)) {
xbuf[i] = *ptr;
} else {
xbuf[i] = '.';
}
if (i % 2) {
*nfrontp = ' ';
nfrontp++;
}
cnt--;
ptr++;
}
xbuf[i] = '\0';
sprintf(nfrontp, " %s\r\n", xbuf );
nfrontp += strlen(nfrontp);
}
}
#endif /* DIAGNOSTICS */
#ifdef NO_STRERROR
char *
strerror(errno)
{
extern char *sys_errlist[];
return(sys_errlist[errno]);
}
#endif