#include <ctype.h>
#define TABBUFSIZ 512
static char *tbuf;
int hopcount;
char *skip();
char *getstr();
char *decode();
getent(bp, name)
char *bp, *name;
{
register char *cp;
register int c;
register int i = 0, cnt = 0;
char ibuf[TABBUFSIZ];
char *cp2;
int tf;
tbuf = bp;
tf = open("/etc/gettytab", 0);
if (tf < 0)
return (-1);
for (;;) {
cp = bp;
for (;;) {
if (i == cnt) {
cnt = read(tf, ibuf, TABBUFSIZ);
if (cnt <= 0) {
close(tf);
return (0);
}
i = 0;
}
c = ibuf[i++];
if (c == '\n') {
if (cp > bp && cp[-1] == '\\'){
cp--;
continue;
}
break;
}
if (cp >= bp+TABBUFSIZ) {
write(2,"Gettytab entry too long\n", 24);
break;
} else
*cp++ = c;
}
*cp = 0;
if (namatch(name)) {
close(tf);
return(nchktc());
}
}
}
#define MAXHOP 32
nchktc()
{
register char *p, *q;
char tcname[16];
char tcbuf[TABBUFSIZ];
char *holdtbuf = tbuf;
int l;
p = tbuf + strlen(tbuf) - 2;
while (*--p != ':')
if (p<tbuf) {
write(2, "Bad gettytab entry\n", 19);
return (0);
}
p++;
if (p[0] != 't' || p[1] != 'c')
return(1);
strncpy(tcname, p + 3, sizeof(tcname) - 1);
tcname[sizeof(tcname) - 1] = '\0';
q = tcname;
while (*q && *q != ':')
q++;
*q = 0;
if (++hopcount > MAXHOP) {
write(2, "Getty: infinite tc= loop\n", 25);
return (0);
}
if (getent(tcbuf, tcname) != 1)
return(0);
for (q=tcbuf; *q != ':'; q++)
;
l = p - holdtbuf + strlen(q);
if (l > TABBUFSIZ) {
write(2, "Gettytab entry too long\n", 24);
q[TABBUFSIZ - (p-tbuf)] = 0;
}
strcpy(p, q+1);
tbuf = holdtbuf;
return(1);
}
namatch(np)
char *np;
{
register char *Np, *Bp;
Bp = tbuf;
if (*Bp == '#')
return(0);
for (;;) {
for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
continue;
if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
return (1);
while (*Bp && *Bp != ':' && *Bp != '|')
Bp++;
if (*Bp == 0 || *Bp == ':')
return (0);
Bp++;
}
}
static char *
skip(bp)
register char *bp;
{
while (*bp && *bp != ':')
bp++;
if (*bp == ':')
bp++;
return (bp);
}
long
getnum(id)
char *id;
{
register long i, base;
register char *bp = tbuf;
for (;;) {
bp = skip(bp);
if (*bp == 0)
return (-1);
if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
continue;
if (*bp == '@')
return(-1);
if (*bp != '#')
continue;
bp++;
base = 10;
if (*bp == '0')
base = 8;
i = 0;
while (isdigit(*bp))
i *= base, i += *bp++ - '0';
return (i);
}
}
getflag(id)
char *id;
{
register char *bp = tbuf;
for (;;) {
bp = skip(bp);
if (!*bp)
return (-1);
if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
if (!*bp || *bp == ':')
return (1);
else if (*bp == '!')
return (0);
else if (*bp == '@')
return(-1);
}
}
}
char *
getstr(id, area)
char *id, **area;
{
register char *bp = tbuf;
for (;;) {
bp = skip(bp);
if (!*bp)
return (0);
if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
continue;
if (*bp == '@')
return(0);
if (*bp != '=')
continue;
bp++;
return (decode(bp, area));
}
}
static char *
decode(str, area)
register char *str;
char **area;
{
register char *cp;
register int c;
register char *dp;
int i;
cp = *area;
while ((c = *str++) && c != ':') {
switch (c) {
case '^':
c = *str++ & 037;
break;
case '\\':
dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
c = *str++;
nextc:
if (*dp++ == c) {
c = *dp++;
break;
}
dp++;
if (*dp)
goto nextc;
if (isdigit(c)) {
c -= '0', i = 2;
do
c <<= 3, c |= *str++ - '0';
while (--i && isdigit(*str));
}
break;
}
*cp++ = c;
}
*cp++ = 0;
str = *area;
*area = cp;
return (str);
}