2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)jobs.c 8.5 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/jobs.c,v 1.92 2011/02/04 22:47:55 jilles Exp $
40 #include <sys/ioctl.h>
41 #include <sys/param.h>
42 #include <sys/resource.h>
56 #undef CEOF /* syntax.h redefines this */
74 static struct job *jobtab; /* array of jobs */
75 static int njobs; /* size of array */
76 MKINIT pid_t backgndpid = -1; /* pid of last background process */
77 MKINIT struct job *bgjob = NULL; /* last background process */
79 static struct job *jobmru; /* most recently used job list */
80 static pid_t initialpgrp; /* pgrp of shell on invocation */
82 int in_waitcmd = 0; /* are we in waitcmd()? */
83 int in_dowait = 0; /* are we in dowait()? */
84 volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */
85 static int ttyfd = -1;
88 static void restartjob(struct job *);
90 static void freejob(struct job *);
91 static struct job *getjob(char *);
92 static pid_t dowait(int, struct job *);
93 static pid_t waitproc(int, int *);
94 static void checkzombies(void);
95 static void cmdtxt(union node *);
96 static void cmdputs(const char *);
98 static void setcurjob(struct job *);
99 static void deljob(struct job *);
100 static struct job *getcurjob(struct job *);
102 static void printjobcmd(struct job *);
103 static void showjob(struct job *, int);
107 * Turn job control on and off.
118 if (on == jobctl || rootshell == 0)
123 if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) {
125 while (i <= 2 && !isatty(i))
127 if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0)
132 * Keep our TTY file descriptor out of the way of
133 * the user's redirections.
135 if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) {
143 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) {
148 do { /* while we are in the background */
149 initialpgrp = tcgetpgrp(ttyfd);
150 if (initialpgrp < 0) {
151 out: out2fmt_flush("sh: can't access tty; job control turned off\n");
155 if (initialpgrp != getpgrp()) {
164 tcsetpgrp(ttyfd, rootpid);
165 } else { /* turning job control off */
166 setpgid(0, initialpgrp);
167 tcsetpgrp(ttyfd, initialpgrp);
181 fgcmd(int argc __unused, char **argv)
187 jp = getjob(argv[1]);
189 error("job not created under job control");
192 pgrp = jp->ps[0].pid;
193 tcsetpgrp(ttyfd, pgrp);
197 status = waitforjob(jp, NULL);
204 bgcmd(int argc, char **argv)
209 jp = getjob(*++argv);
211 error("job not created under job control");
212 if (jp->state == JOBDONE)
216 out1fmt("[%td] ", jp - jobtab + 1);
218 } while (--argc > 1);
224 restartjob(struct job *jp)
229 if (jp->state == JOBDONE)
233 kill(-jp->ps[0].pid, SIGCONT);
234 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
235 if (WIFSTOPPED(ps->status)) {
246 jobscmd(int argc, char *argv[])
251 optind = optreset = 1;
253 mode = SHOWJOBS_DEFAULT;
254 while ((ch = getopt(argc, argv, "lps")) != -1) {
257 mode = SHOWJOBS_VERBOSE;
260 mode = SHOWJOBS_PGIDS;
263 mode = SHOWJOBS_PIDS;
267 error("unknown option: -%c", optopt);
276 while ((id = *argv++) != NULL)
277 showjob(getjob(id), mode);
283 printjobcmd(struct job *jp)
288 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
297 showjob(struct job *jp, int mode)
303 int col, curr, i, jobno, prev, procno;
306 procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs;
307 jobno = jp - jobtab + 1;
310 if ((j = getcurjob(NULL)) != NULL) {
311 curr = j - jobtab + 1;
312 if ((j = getcurjob(j)) != NULL)
313 prev = j - jobtab + 1;
316 ps = jp->ps + jp->nprocs - 1;
317 if (jp->state == 0) {
318 strcpy(statestr, "Running");
320 } else if (jp->state == JOBSTOPPED) {
321 while (!WIFSTOPPED(ps->status) && ps > jp->ps)
323 if (WIFSTOPPED(ps->status))
324 i = WSTOPSIG(ps->status);
327 if (i > 0 && i < sys_nsig && sys_siglist[i])
328 strcpy(statestr, sys_siglist[i]);
330 strcpy(statestr, "Suspended");
332 } else if (WIFEXITED(ps->status)) {
333 if (WEXITSTATUS(ps->status) == 0)
334 strcpy(statestr, "Done");
336 fmtstr(statestr, 64, "Done(%d)",
337 WEXITSTATUS(ps->status));
339 i = WTERMSIG(ps->status);
340 if (i > 0 && i < sys_nsig && sys_siglist[i])
341 strcpy(statestr, sys_siglist[i]);
343 fmtstr(statestr, 64, "Signal %d", i);
344 if (WCOREDUMP(ps->status))
345 strcat(statestr, " (core dumped)");
348 for (ps = jp->ps ; ; ps++) { /* for each process */
349 if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) {
350 out1fmt("%d\n", (int)ps->pid);
353 if (mode != SHOWJOBS_VERBOSE && ps != jp->ps)
355 if (jobno == curr && ps == jp->ps)
357 else if (jobno == prev && ps == jp->ps)
362 fmtstr(s, 64, "[%d] %c ", jobno, c);
364 fmtstr(s, 64, " %c ", c);
367 if (mode == SHOWJOBS_VERBOSE) {
368 fmtstr(s, 64, "%d ", (int)ps->pid);
374 col += strlen(statestr);
380 if (mode == SHOWJOBS_VERBOSE) {
385 skip: if (--procno <= 0)
391 * Print a list of jobs. If "change" is nonzero, only print jobs whose
392 * statuses have changed since the last call to showjobs.
394 * If the shell is interrupted in the process of creating a job, the
395 * result may be a job structure containing zero processes. Such structures
396 * will be freed here.
400 showjobs(int change, int mode)
405 TRACE(("showjobs(%d) called\n", change));
407 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
410 if (jp->nprocs == 0) {
414 if (change && ! jp->changed)
418 /* Hack: discard jobs for which $! has not been referenced
419 * in interactive mode when they terminate.
421 if (jp->state == JOBDONE && !jp->remembered &&
422 (iflag || jp != bgjob)) {
430 * Mark a job structure as unused.
434 freejob(struct job *jp)
442 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
443 if (ps->cmd != nullstr)
446 if (jp->ps != &jp->ps0)
458 waitcmd(int argc, char **argv)
465 job = getjob(argv[1]);
471 * Loop until a process is terminated or stopped, or a SIGINT is
479 status = job->ps[job->nprocs - 1].status;
480 if (WIFEXITED(status))
481 retval = WEXITSTATUS(status);
483 else if (WIFSTOPPED(status))
484 retval = WSTOPSIG(status) + 128;
487 retval = WTERMSIG(status) + 128;
488 if (! iflag || ! job->changed)
499 for (jp = jobtab ; jp < jobtab + njobs; jp++)
500 if (jp->used && jp->state == JOBDONE) {
501 if (! iflag || ! jp->changed)
509 for (jp = jobtab ; ; jp++) {
510 if (jp >= jobtab + njobs) { /* no running procs */
514 if (jp->used && jp->state == 0)
518 } while (dowait(1, NULL) != -1);
527 jobidcmd(int argc __unused, char **argv)
532 jp = getjob(argv[1]);
533 for (i = 0 ; i < jp->nprocs ; ) {
534 out1fmt("%d", (int)jp->ps[i].pid);
535 out1c(++i < jp->nprocs? ' ' : '\n');
543 * Convert a job name to a job structure.
550 struct job *found, *jp;
556 currentjob: if ((jp = getcurjob(NULL)) == NULL)
557 error("No current job");
560 error("No current job");
562 } else if (name[0] == '%') {
563 if (is_digit(name[1])) {
564 jobno = number(name + 1);
565 if (jobno > 0 && jobno <= njobs
566 && jobtab[jobno - 1].used != 0)
567 return &jobtab[jobno - 1];
569 } else if (name[1] == '%' && name[2] == '\0') {
571 } else if (name[1] == '+' && name[2] == '\0') {
573 } else if (name[1] == '-' && name[2] == '\0') {
574 if ((jp = getcurjob(NULL)) == NULL ||
575 (jp = getcurjob(jp)) == NULL)
576 error("No previous job");
579 } else if (name[1] == '?') {
581 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
582 if (jp->used && jp->nprocs > 0
583 && strstr(jp->ps[0].cmd, name + 2) != NULL) {
585 error("%s: ambiguous", name);
593 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
594 if (jp->used && jp->nprocs > 0
595 && prefix(name + 1, jp->ps[0].cmd)) {
597 error("%s: ambiguous", name);
604 } else if (is_number(name)) {
605 pid = (pid_t)number(name);
606 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
607 if (jp->used && jp->nprocs > 0
608 && jp->ps[jp->nprocs - 1].pid == pid)
612 error("No such job: %s", name);
619 getjobpgrp(char *name)
624 return -jp->ps[0].pid;
628 * Return a new job structure,
632 makejob(union node *node __unused, int nprocs)
637 for (i = njobs, jp = jobtab ; ; jp++) {
641 jobtab = ckmalloc(4 * sizeof jobtab[0]);
646 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
647 memcpy(jp, jobtab, njobs * sizeof jp[0]);
649 /* Relocate `next' pointers and list head */
651 jobmru = &jp[jobmru - jobtab];
652 for (i = 0; i < njobs; i++)
653 if (jp[i].next != NULL)
654 jp[i].next = &jp[jp[i].next -
658 bgjob = &jp[bgjob - jobtab];
659 /* Relocate `ps' pointers */
660 for (i = 0; i < njobs; i++)
661 if (jp[i].ps == &jobtab[i].ps0)
662 jp[i].ps = &jp[i].ps0;
667 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
686 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
691 TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs,
698 setcurjob(struct job *cj)
700 struct job *jp, *prev;
702 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
705 prev->next = jp->next;
718 deljob(struct job *j)
720 struct job *jp, *prev;
722 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
725 prev->next = jp->next;
734 * Return the most recently used job that isn't `nj', and preferably one
738 getcurjob(struct job *nj)
742 /* Try to find a stopped one.. */
743 for (jp = jobmru; jp != NULL; jp = jp->next)
744 if (jp->used && jp != nj && jp->state == JOBSTOPPED)
746 /* Otherwise the most recently used job that isn't `nj' */
747 for (jp = jobmru; jp != NULL; jp = jp->next)
748 if (jp->used && jp != nj)
757 * Fork of a subshell. If we are doing job control, give the subshell its
758 * own process group. Jp is a job structure that the job is to be added to.
759 * N is the command that will be evaluated by the child. Both jp and n may
760 * be NULL. The mode parameter can be one of the following:
761 * FORK_FG - Fork off a foreground process.
762 * FORK_BG - Fork off a background process.
763 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
764 * process group even if job control is on.
766 * When job control is turned off, background processes have their standard
767 * input redirected to /dev/null (except for the second and later processes
772 forkshell(struct job *jp, union node *n, int mode)
777 TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n,
780 if (mode == FORK_BG && (jp == NULL || jp->nprocs == 0))
785 TRACE(("Fork failed, errno=%d\n", errno));
787 error("Cannot fork: %s", strerror(errno));
794 TRACE(("Child shell %d\n", (int)getpid()));
797 handler = &main_handler;
802 jobctl = 0; /* do job control only in root shell */
803 if (wasroot && mode != FORK_NOJOB && mflag) {
804 if (jp == NULL || jp->nprocs == 0)
807 pgrp = jp->ps[0].pid;
808 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) {
809 /*** this causes superfluous TIOCSPGRPS ***/
810 if (tcsetpgrp(ttyfd, pgrp) < 0)
811 error("tcsetpgrp failed, errno=%d", errno);
815 } else if (mode == FORK_BG) {
818 if ((jp == NULL || jp->nprocs == 0) &&
819 ! fd0_redirected_p ()) {
821 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
822 error("Can't open %s: %s",
823 _PATH_DEVNULL, strerror(errno));
827 if (mode == FORK_BG) {
830 if ((jp == NULL || jp->nprocs == 0) &&
831 ! fd0_redirected_p ()) {
833 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
834 error("Can't open %s: %s",
835 _PATH_DEVNULL, strerror(errno));
840 for (i = njobs, p = jobtab ; --i >= 0 ; p++)
844 if (wasroot && iflag) {
851 if (rootshell && mode != FORK_NOJOB && mflag) {
852 if (jp == NULL || jp->nprocs == 0)
855 pgrp = jp->ps[0].pid;
858 if (mode == FORK_BG) {
859 if (bgjob != NULL && bgjob->state == JOBDONE &&
860 !bgjob->remembered && !iflag)
862 backgndpid = pid; /* set $! */
866 struct procstat *ps = &jp->ps[jp->nprocs++];
870 if (iflag && rootshell && n)
871 ps->cmd = commandtext(n);
872 jp->foreground = mode == FORK_FG;
878 TRACE(("In parent shell: child = %d\n", (int)pid));
885 * Wait for job to finish.
887 * Under job control we have the problem that while a child process is
888 * running interrupts generated by the user are sent to the child but not
889 * to the shell. This means that an infinite loop started by an inter-
890 * active user may be hard to kill. With job control turned off, an
891 * interactive user may place an interactive program inside a loop. If
892 * the interactive program catches interrupts, the user doesn't want
893 * these interrupts to also abort the loop. The approach we take here
894 * is to have the shell ignore interrupt signals while waiting for a
895 * foreground process to terminate, and then send itself an interrupt
896 * signal if the child process was terminated by an interrupt signal.
897 * Unfortunately, some programs want to do a bit of cleanup and then
898 * exit on interrupt; unless these processes terminate themselves by
899 * sending a signal to themselves (instead of calling exit) they will
900 * confuse this approach.
904 waitforjob(struct job *jp, int *origstatus)
907 pid_t mypgrp = getpgrp();
908 int propagate_int = jp->jobctl && jp->foreground;
914 TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1));
915 while (jp->state == 0)
916 if (dowait(1, jp) == -1)
920 if (tcsetpgrp(ttyfd, mypgrp) < 0)
921 error("tcsetpgrp failed, errno=%d\n", errno);
923 if (jp->state == JOBSTOPPED)
926 status = jp->ps[jp->nprocs - 1].status;
927 if (origstatus != NULL)
928 *origstatus = status;
929 /* convert to 8 bits */
930 if (WIFEXITED(status))
931 st = WEXITSTATUS(status);
933 else if (WIFSTOPPED(status))
934 st = WSTOPSIG(status) + 128;
937 st = WTERMSIG(status) + 128;
938 if (! JOBS || jp->state == JOBDONE)
941 if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGINT)
945 else if (rootshell && iflag && propagate_int &&
946 WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
947 kill(getpid(), SIGINT);
956 * Wait for a process to terminate.
960 dowait(int block, struct job *job)
973 TRACE(("dowait(%d) called\n", block));
975 pid = waitproc(block, &status);
976 TRACE(("wait returns %d, status=%d\n", (int)pid, status));
977 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) ||
978 (pid > 0 && WIFSTOPPED(status) && !iflag));
980 if (pid == -1 && errno == ECHILD && job != NULL)
981 job->state = JOBDONE;
982 if (breakwaitcmd != 0) {
985 * Do not early terminate if the pid is positive, else the
986 * job will not be properly recorded.
995 for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
996 if (jp->used && jp->nprocs > 0) {
999 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
1002 if (sp->pid == pid) {
1003 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n",
1004 (int)pid, sp->status,
1006 sp->status = status;
1009 if (sp->status == -1)
1011 else if (WIFSTOPPED(sp->status))
1014 if (stopped) { /* stopped or done */
1015 int state = done? JOBDONE : JOBSTOPPED;
1016 if (jp->state != state) {
1017 TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
1020 if (done && !jp->remembered &&
1021 !iflag && jp != bgjob)
1033 if (!thisjob || thisjob->state == 0)
1035 else if ((!rootshell || !iflag || thisjob == job) &&
1036 thisjob->foreground && thisjob->state != JOBSTOPPED) {
1039 for (sp = thisjob->ps; sp < thisjob->ps + thisjob->nprocs; sp++)
1040 if (WIFSIGNALED(sp->status)) {
1041 sig = WTERMSIG(sp->status);
1042 coredump = WCOREDUMP(sp->status);
1044 if (sig > 0 && sig != SIGINT && sig != SIGPIPE) {
1045 if (sig < sys_nsig && sys_siglist[sig])
1046 out2str(sys_siglist[sig]);
1048 outfmt(out2, "Signal %d", sig);
1050 out2str(" (core dumped)");
1055 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job));
1056 thisjob->changed = 1;
1064 * Do a wait system call. If job control is compiled in, we accept
1065 * stopped processes. If block is zero, we return a value of zero
1066 * rather than blocking.
1069 waitproc(int block, int *status)
1080 return wait3(status, flags, NULL);
1084 * return 1 if there are stopped jobs, otherwise 0
1086 int job_warning = 0;
1095 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
1098 if (jp->state == JOBSTOPPED) {
1099 out2fmt_flush("You have stopped jobs.\n");
1112 while (njobs > 0 && dowait(0, NULL) > 0)
1120 return backgndpid != -1;
1128 bgjob->remembered = 1;
1133 * Return a string identifying a command (to be printed by the
1137 static char *cmdnextc;
1138 static int cmdnleft;
1139 #define MAXCMDTEXT 200
1142 commandtext(union node *n)
1146 cmdnextc = name = ckmalloc(MAXCMDTEXT);
1147 cmdnleft = MAXCMDTEXT - 4;
1155 cmdtxt(union node *n)
1158 struct nodelist *lp;
1167 cmdtxt(n->nbinary.ch1);
1169 cmdtxt(n->nbinary.ch2);
1172 cmdtxt(n->nbinary.ch1);
1174 cmdtxt(n->nbinary.ch2);
1177 cmdtxt(n->nbinary.ch1);
1179 cmdtxt(n->nbinary.ch2);
1182 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
1190 cmdtxt(n->nredir.n);
1195 cmdtxt(n->nredir.n);
1199 cmdtxt(n->nif.test);
1201 cmdtxt(n->nif.ifpart);
1210 cmdtxt(n->nbinary.ch1);
1212 cmdtxt(n->nbinary.ch2);
1217 cmdputs(n->nfor.var);
1222 cmdputs(n->ncase.expr->narg.text);
1226 cmdputs(n->narg.text);
1230 for (np = n->ncmd.args ; np ; np = np->narg.next) {
1235 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
1241 cmdputs(n->narg.text);
1244 p = ">"; i = 1; goto redir;
1246 p = ">>"; i = 1; goto redir;
1248 p = ">&"; i = 1; goto redir;
1250 p = ">|"; i = 1; goto redir;
1252 p = "<"; i = 0; goto redir;
1254 p = "<>"; i = 0; goto redir;
1256 p = "<&"; i = 0; goto redir;
1258 if (n->nfile.fd != i) {
1259 s[0] = n->nfile.fd + '0';
1264 if (n->type == NTOFD || n->type == NFROMFD) {
1265 if (n->ndup.dupfd >= 0)
1266 s[0] = n->ndup.dupfd + '0';
1272 cmdtxt(n->nfile.fname);
1288 cmdputs(const char *s)
1299 while ((c = *p++) != '\0') {
1302 else if (c == CTLVAR) {
1307 if ((subtype & VSTYPE) == VSLENGTH && --cmdnleft > 0)
1309 } else if (c == '=' && subtype != 0) {
1310 *q = "}-+?=##%%\0X"[(subtype & VSTYPE) - VSNORMAL];
1315 if (((subtype & VSTYPE) == VSTRIMLEFTMAX ||
1316 (subtype & VSTYPE) == VSTRIMRIGHTMAX) &&
1320 } else if (c == CTLENDVAR) {
1322 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) {
1332 } else if (c == CTLARI) {
1340 } else if (c == CTLENDARI) {
1341 if (--cmdnleft > 0) {
1345 } else if (c == CTLQUOTEMARK || c == CTLQUOTEEND)
1346 cmdnleft++; /* ignore */
1349 if (--cmdnleft <= 0) {