static void comsubst(void)
{
/* command substn */
FILEBLK cb;
register char d;
register STKPTR savptr = fixstak();
usestak();
while ((d = readc()) != SQUOTE && d)
pushstak(d);
{
register char *argc;
trim(argc = fixstak());
push(&cb);
estabf(argc);
}
{
register TREPTR t =
makefork(FPOU, cmd(EOFSYM, MTFLG | NLFLG));
int pv[2];
/* this is done like this so that the pipe
* is open only when needed
*/
chkpipe(pv);
initf(pv[INPIPE]);
execute(t, 0, 0, pv);
close(pv[OTPIPE]);
}
tdystak(savptr);
staktop = movstr(savptr, stakbot);
while (d = readc())
pushstak(d | quote);
await(0);
while (stakbot != staktop) {
if ((*--staktop & STRIP) != NL) {
++staktop;
break;
}
}
pop();
}
static void
exfile(int prof)
{
time_t mailtime = 0; /* Must not be a register variable */
time_t curtime = 0;
/*
* move input
*/
if (input > 0) {
Ldup(input, INIO);
input = INIO;
}
setmode(prof);
if (setjmp(errshell) && prof) {
close(input);
(void) endjobs(0);
return;
}
/*
* error return here
*/
loopcnt = peekc = peekn = 0;
fndef = 0;
nohash = 0;
iopend = 0;
if (input >= 0)
initf(input);
/*
* command loop
*/
for (;;) {
tdystak(0);
stakchk(); /* may reduce sbrk */
exitset();
if ((flags & prompt) && standin->fstak == 0 && !eof) {
if (mailp) {
time(&curtime);
if ((curtime - mailtime) >= mailchk) {
chkmail();
mailtime = curtime;
}
}
/* necessary to print jobs in a timely manner */
if (trapnote & TRAPSET)
chktrap();
prs(ps1nod.namval);
#ifdef TIME_OUT
alarm(TIMEOUT);
#endif
}
trapnote = 0;
peekc = readwc();
if (eof) {
if (endjobs(JOB_STOPPED))
return;
eof = 0;
}
#ifdef TIME_OUT
alarm(0);
#endif
{
struct trenod *t;
t = cmd(NL, MTFLG);
if (t == NULL && flags & ttyflg)
freejobs();
else
execute(t, 0, eflag);
}
eof |= (flags & oneflg);
}
}
static void exfile(BOOL prof)
{
register L_INT mailtime = 0;
register int userid;
struct stat statb;
/* move input */
if (input > 0) {
Ldup(input, INIO);
input = INIO;
}
/* move output to safe place */
if (output == 2) {
Ldup(dup(2), OTIO);
output = OTIO;
}
userid = getuid();
/* decide whether interactive */
if ((flags & intflg)
|| ((flags & oneflg) == 0 && isatty(output) && isatty(input))) {
dfault(&ps1nod, (userid ? stdprompt : supprompt));
dfault(&ps2nod, readmsg);
flags |= ttyflg | prompt;
ignsig(KILL);
} else {
flags |= prof;
flags &= ~prompt;
}
if (setjmp(errshell) && prof) {
close(input);
return;
}
/* error return here */
loopcnt = breakcnt = peekc = 0;
iopend = 0;
if (input >= 0)
initf(input);
/* command loop */
for (;;) {
tdystak(0);
stakchk(); /* may reduce sbrk */
exitset();
if ((flags & prompt) && standin->fstak == 0 && !eof) {
if (mailnod.namval
&& stat(mailnod.namval, &statb) >= 0
&& statb.st_size
&& (statb.st_mtime != mailtime)
&& mailtime) {
prs(mailmsg);
}
mailtime = statb.st_mtime;
prs(ps1nod.namval);
alarm(TIMEOUT);
flags |= waiting;
}
trapnote = 0;
peekc = readc();
if (eof)
return;
alarm(0);
flags &= ~waiting;
execute(cmd(NL, MTFLG), 0, NULL, NULL);
eof |= (flags & oneflg);
}
}