+/*-
+ * Copyright (c) 1980, 1991 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)csh.c 5.26 (Berkeley) 6/8/91";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <locale.h>
+#include <unistd.h>
+#if __STDC__
+# include <stdarg.h>
+#else
+# include <varargs.h>
+#endif
+
+#include "csh.h"
+#include "extern.h"
+#include "pathnames.h"
+
+extern bool MapsAreInited;
+extern bool NLSMapsAreInited;
+
+/*
+ * C Shell
+ *
+ * Bill Joy, UC Berkeley, California, USA
+ * October 1978, May 1980
+ *
+ * Jim Kulp, IIASA, Laxenburg, Austria
+ * April 1980
+ *
+ * Christos Zoulas, Cornell University
+ * June, 1991
+ */
+
+Char *dumphist[] = {STRhistory, STRmh, 0, 0};
+Char *loadhist[] = {STRsource, STRmh, STRhistfile, 0};
+
+int nofile = 0;
+bool reenter = 0;
+bool nverbose = 0;
+bool nexececho = 0;
+bool quitit = 0;
+bool fast = 0;
+bool batch = 0;
+bool mflag = 0;
+bool prompt = 1;
+bool enterhist = 0;
+bool tellwhat = 0;
+
+extern char **environ;
+
+static int srccat __P((Char *, Char *));
+static int srcfile __P((char *, bool, bool));
+static void phup __P((int));
+static void srcunit __P((int, bool, bool));
+static void mailchk __P((void));
+static Char **defaultpath __P((void));
+
+int
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ register Char *cp;
+ register char *tcp;
+ register int f;
+ register char **tempv;
+ struct sigvec osv;
+
+
+ settimes(); /* Immed. estab. timing base */
+
+ /*
+ * Initialize non constant strings
+ */
+#ifdef _PATH_BSHELL
+ STR_BSHELL = SAVE(_PATH_BSHELL);
+#endif
+#ifdef _PATH_CSHELL
+ STR_SHELLPATH = SAVE(_PATH_CSHELL);
+#endif
+ STR_environ = blk2short(environ);
+ environ = short2blk(STR_environ); /* So that we can free it */
+ STR_WORD_CHARS = SAVE(WORD_CHARS);
+
+ HIST = '!';
+ HISTSUB = '^';
+ word_chars = STR_WORD_CHARS;
+
+ tempv = argv;
+ if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */
+ quitit = 1;
+ uid = getuid();
+ gid = getgid();
+ /*
+ * We are a login shell if: 1. we were invoked as -<something> and we had
+ * no arguments 2. or we were invoked only with the -l flag
+ */
+ loginsh = (**tempv == '-' && argc == 1) ||
+ (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' &&
+ tempv[1][2] == '\0');
+
+ if (loginsh && **tempv != '-') {
+ /*
+ * Mangle the argv space
+ */
+ tempv[1][0] = '\0';
+ tempv[1][1] = '\0';
+ tempv[1] = NULL;
+ for (tcp = *tempv; *tcp++;);
+ for (tcp--; tcp >= *tempv; tcp--)
+ tcp[1] = tcp[0];
+ *++tcp = '-';
+ argc--;
+ }
+ if (loginsh)
+ (void) time(&chktim);
+
+ AsciiOnly = 1;
+#ifdef NLS
+ (void) setlocale(LC_ALL, "");
+ {
+ int k;
+
+ for (k = 0200; k <= 0377 && !Isprint(k); k++);
+ AsciiOnly = k > 0377;
+ }
+#else
+ AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
+#endif /* NLS */
+
+ /*
+ * Move the descriptors to safe places. The variable didfds is 0 while we
+ * have only FSH* to work with. When didfds is true, we have 0,1,2 and
+ * prefer to use these.
+ */
+ initdesc();
+
+ /*
+ * Initialize the shell variables. ARGV and PROMPT are initialized later.
+ * STATUS is also munged in several places. CHILD is munged when
+ * forking/waiting
+ */
+ set(STRstatus, Strsave(STR0));
+
+ if ((tcp = getenv("HOME")) != NULL)
+ cp = SAVE(tcp);
+ else
+ cp = NULL;
+
+ if (cp == NULL)
+ fast = 1; /* No home -> can't read scripts */
+ else
+ set(STRhome, cp);
+ dinit(cp); /* dinit thinks that HOME == cwd in a login
+ * shell */
+ /*
+ * Grab other useful things from the environment. Should we grab
+ * everything??
+ */
+ if ((tcp = getenv("LOGNAME")) != NULL ||
+ (tcp = getenv("USER")) != NULL)
+ set(STRuser, SAVE(tcp));
+ if ((tcp = getenv("TERM")) != NULL)
+ set(STRterm, SAVE(tcp));
+
+ /*
+ * Re-initialize path if set in environment
+ */
+ if ((tcp = getenv("PATH")) == NULL)
+ set1(STRpath, defaultpath(), &shvhed);
+ else
+ importpath(SAVE(tcp));
+
+ set(STRshell, Strsave(STR_SHELLPATH));
+
+ doldol = putn((int) getpid()); /* For $$ */
+ shtemp = Strspl(STRtmpsh, doldol); /* For << */
+
+ /*
+ * Record the interrupt states from the parent process. If the parent is
+ * non-interruptible our hand must be forced or we (and our children) won't
+ * be either. Our children inherit termination from our parent. We catch it
+ * only if we are the login shell.
+ */
+ /* parents interruptibility */
+ (void) sigvec(SIGINT, NULL, &osv);
+ parintr = (void (*) ()) osv.sv_handler;
+ (void) sigvec(SIGTERM, NULL, &osv);
+ parterm = (void (*) ()) osv.sv_handler;
+
+ if (loginsh) {
+ (void) signal(SIGHUP, phup); /* exit processing on HUP */
+ (void) signal(SIGXCPU, phup); /* ...and on XCPU */
+ (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */
+ }
+
+ /*
+ * Process the arguments.
+ *
+ * Note that processing of -v/-x is actually delayed till after script
+ * processing.
+ *
+ * We set the first character of our name to be '-' if we are a shell running
+ * interruptible commands. Many programs which examine ps'es use this to
+ * filter such shells out.
+ */
+ argc--, tempv++;
+ while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) {
+ do
+ switch (*tcp++) {
+
+ case 0: /* - Interruptible, no prompt */
+ prompt = 0;
+ setintr = 1;
+ nofile = 1;
+ break;
+
+ case 'b': /* -b Next arg is input file */
+ batch = 1;
+ break;
+
+ case 'c': /* -c Command input from arg */
+ if (argc == 1)
+ xexit(0);
+ argc--, tempv++;
+ arginp = SAVE(tempv[0]);
+ prompt = 0;
+ nofile = 1;
+ break;
+
+ case 'e': /* -e Exit on any error */
+ exiterr = 1;
+ break;
+
+ case 'f': /* -f Fast start */
+ fast = 1;
+ break;
+
+ case 'i': /* -i Interactive, even if !intty */
+ intact = 1;
+ nofile = 1;
+ break;
+
+ case 'm': /* -m read .cshrc (from su) */
+ mflag = 1;
+ break;
+
+ case 'n': /* -n Don't execute */
+ noexec = 1;
+ break;
+
+ case 'q': /* -q (Undoc'd) ... die on quit */
+ quitit = 1;
+ break;
+
+ case 's': /* -s Read from std input */
+ nofile = 1;
+ break;
+
+ case 't': /* -t Read one line from input */
+ onelflg = 2;
+ prompt = 0;
+ nofile = 1;
+ break;
+
+ case 'v': /* -v Echo hist expanded input */
+ nverbose = 1; /* ... later */
+ break;
+
+ case 'x': /* -x Echo just before execution */
+ nexececho = 1; /* ... later */
+ break;
+
+ case 'V': /* -V Echo hist expanded input */
+ setNS(STRverbose); /* NOW! */
+ break;
+
+ case 'X': /* -X Echo just before execution */
+ setNS(STRecho); /* NOW! */
+ break;
+
+ } while (*tcp);
+ tempv++, argc--;
+ }
+
+ if (quitit) /* With all due haste, for debugging */
+ (void) signal(SIGQUIT, SIG_DFL);
+
+ /*
+ * Unless prevented by -, -c, -i, -s, or -t, if there are remaining
+ * arguments the first of them is the name of a shell file from which to
+ * read commands.
+ */
+ if (nofile == 0 && argc > 0) {
+ nofile = open(tempv[0], O_RDONLY);
+ if (nofile < 0) {
+ child = 1; /* So this doesn't return */
+ stderror(ERR_SYSTEM, tempv[0], strerror(errno));
+ }
+ ffile = SAVE(tempv[0]);
+ /*
+ * Replace FSHIN. Handle /dev/std{in,out,err} specially
+ * since once they are closed we cannot open them again.
+ * In that case we use our own saved descriptors
+ */
+ if ((SHIN = dmove(nofile, FSHIN)) < 0)
+ switch(nofile) {
+ case 0:
+ SHIN = FSHIN;
+ break;
+ case 1:
+ SHIN = FSHOUT;
+ break;
+ case 2:
+ SHIN = FSHDIAG;
+ break;
+ default:
+ stderror(ERR_SYSTEM, tempv[0], strerror(errno));
+ break;
+ }
+ (void) ioctl(SHIN, FIOCLEX, NULL);
+ prompt = 0;
+ /* argc not used any more */ tempv++;
+ }
+ intty = isatty(SHIN);
+ intty |= intact;
+ if (intty || (intact && isatty(SHOUT))) {
+ if (!batch && (uid != geteuid() || gid != getegid())) {
+ errno = EACCES;
+ child = 1; /* So this doesn't return */
+ stderror(ERR_SYSTEM, "csh", strerror(errno));
+ }
+ }
+ /*
+ * Decide whether we should play with signals or not. If we are explicitly
+ * told (via -i, or -) or we are a login shell (arg0 starts with -) or the
+ * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
+ * Note that in only the login shell is it likely that parent may have set
+ * signals to be ignored
+ */
+ if (loginsh || intact || intty && isatty(SHOUT))
+ setintr = 1;
+ settell();
+ /*
+ * Save the remaining arguments in argv.
+ */
+ setq(STRargv, blk2short(tempv), &shvhed);
+
+ /*
+ * Set up the prompt.
+ */
+ if (prompt) {
+ set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent));
+ /* that's a meta-questionmark */
+ set(STRprompt2, Strsave(STRmquestion));
+ }
+
+ /*
+ * If we are an interactive shell, then start fiddling with the signals;
+ * this is a tricky game.
+ */
+ shpgrp = getpgrp();
+ opgrp = tpgrp = -1;
+ if (setintr) {
+ **argv = '-';
+ if (!quitit) /* Wary! */
+ (void) signal(SIGQUIT, SIG_IGN);
+ (void) signal(SIGINT, pintr);
+ (void) sigblock(sigmask(SIGINT));
+ (void) signal(SIGTERM, SIG_IGN);
+ if (quitit == 0 && arginp == 0) {
+ (void) signal(SIGTSTP, SIG_IGN);
+ (void) signal(SIGTTIN, SIG_IGN);
+ (void) signal(SIGTTOU, SIG_IGN);
+ /*
+ * Wait till in foreground, in case someone stupidly runs csh &
+ * dont want to try to grab away the tty.
+ */
+ if (isatty(FSHDIAG))
+ f = FSHDIAG;
+ else if (isatty(FSHOUT))
+ f = FSHOUT;
+ else if (isatty(OLDSTD))
+ f = OLDSTD;
+ else
+ f = -1;
+ retry:
+ if ((tpgrp = tcgetpgrp(f)) != -1) {
+ if (tpgrp != shpgrp) {
+ sig_t old = signal(SIGTTIN, SIG_DFL);
+ (void) kill(0, SIGTTIN);
+ (void) signal(SIGTTIN, old);
+ goto retry;
+ }
+ opgrp = shpgrp;
+ shpgrp = getpid();
+ tpgrp = shpgrp;
+ /*
+ * Setpgid will fail if we are a session leader and
+ * mypid == mypgrp (POSIX 4.3.3)
+ */
+ if (opgrp != shpgrp)
+ if (setpgid(0, shpgrp) == -1)
+ goto notty;
+ /*
+ * We do that after we set our process group, to make sure
+ * that the process group belongs to a process in the same
+ * session as the tty (our process and our group) (POSIX 7.2.4)
+ */
+ if (tcsetpgrp(f, shpgrp) == -1)
+ goto notty;
+ (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL);
+ }
+ if (tpgrp == -1) {
+notty:
+ xprintf("Warning: no access to tty (%s).\n", strerror(errno));
+ xprintf("Thus no job control in this shell.\n");
+ }
+ }
+ }
+ if ((setintr == 0) && (parintr == SIG_DFL))
+ setintr = 1;
+ (void) signal(SIGCHLD, pchild); /* while signals not ready */
+
+ /*
+ * Set an exit here in case of an interrupt or error reading the shell
+ * start-up scripts.
+ */
+ reenter = setexit(); /* PWP */
+ haderr = 0; /* In case second time through */
+ if (!fast && reenter == 0) {
+ /* Will have value(STRhome) here because set fast if don't */
+ {
+ int osetintr = setintr;
+ sigset_t omask = sigblock(sigmask(SIGINT));
+
+ setintr = 0;
+#ifdef _PATH_DOTCSHRC
+ (void) srcfile(_PATH_DOTCSHRC, 0, 0);
+#endif
+ if (!fast && !arginp && !onelflg)
+ dohash();
+#ifdef _PATH_DOTLOGIN
+ if (loginsh)
+ (void) srcfile(_PATH_DOTLOGIN, 0, 0);
+#endif
+ (void) sigsetmask(omask);
+ setintr = osetintr;
+ }
+ (void) srccat(value(STRhome), STRsldotcshrc);
+
+ if (!fast && !arginp && !onelflg && !havhash)
+ dohash();
+ if (loginsh)
+ (void) srccat(value(STRhome), STRsldotlogin);
+ dosource(loadhist);
+ }
+
+ /*
+ * Now are ready for the -v and -x flags
+ */
+ if (nverbose)
+ setNS(STRverbose);
+ if (nexececho)
+ setNS(STRecho);
+
+ /*
+ * All the rest of the world is inside this call. The argument to process
+ * indicates whether it should catch "error unwinds". Thus if we are a
+ * interactive shell our call here will never return by being blown past on
+ * an error.
+ */
+ process(setintr);
+
+ /*
+ * Mop-up.
+ */
+ if (intty) {
+ if (loginsh) {
+ xprintf("logout\n");
+ (void) close(SHIN);
+ child = 1;
+ goodbye();
+ }
+ else {
+ xprintf("exit\n");
+ }
+ }
+ rechist();
+ exitstat();
+ return (0);
+}
+
+void
+untty()
+{
+ if (tpgrp > 0) {
+ (void) setpgid(0, opgrp);
+ (void) tcsetpgrp(FSHTTY, opgrp);
+ }
+}
+
+void
+importpath(cp)
+ Char *cp;
+{
+ register int i = 0;
+ register Char *dp;
+ register Char **pv;
+ int c;
+
+ for (dp = cp; *dp; dp++)
+ if (*dp == ':')
+ i++;
+ /*
+ * i+2 where i is the number of colons in the path. There are i+1
+ * directories in the path plus we need room for a zero terminator.
+ */
+ pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **));
+ dp = cp;
+ i = 0;
+ if (*dp)
+ for (;;) {
+ if ((c = *dp) == ':' || c == 0) {
+ *dp = 0;
+ pv[i++] = Strsave(*cp ? cp : STRdot);
+ if (c) {
+ cp = dp + 1;
+ *dp = ':';
+ }
+ else
+ break;
+ }
+ dp++;
+ }
+ pv[i] = 0;
+ set1(STRpath, pv, &shvhed);
+}
+
+/*
+ * Source to the file which is the catenation of the argument names.
+ */
+static int
+srccat(cp, dp)
+ Char *cp, *dp;
+{
+ register Char *ep = Strspl(cp, dp);
+ char *ptr = short2str(ep);
+
+ xfree((ptr_t) ep);
+ return srcfile(ptr, mflag ? 0 : 1, 0);
+}
+
+/*
+ * Source to a file putting the file descriptor in a safe place (> 2).
+ */
+static int
+srcfile(f, onlyown, flag)
+ char *f;
+ bool onlyown, flag;
+{
+ register int unit;
+
+ if ((unit = open(f, O_RDONLY)) == -1)
+ return 0;
+ unit = dmove(unit, -1);
+
+ (void) ioctl(unit, FIOCLEX, NULL);
+ srcunit(unit, onlyown, flag);
+ return 1;
+}
+
+/*
+ * Source to a unit. If onlyown it must be our file or our group or
+ * we don't chance it. This occurs on ".cshrc"s and the like.
+ */
+int insource;
+static void
+srcunit(unit, onlyown, hflg)
+ register int unit;
+ bool onlyown, hflg;
+{
+ /* We have to push down a lot of state here */
+ /* All this could go into a structure */
+ int oSHIN = -1, oldintty = intty, oinsource = insource;
+ struct whyle *oldwhyl = whyles;
+ Char *ogointr = gointr, *oarginp = arginp;
+ Char *oevalp = evalp, **oevalvec = evalvec;
+ int oonelflg = onelflg;
+ bool oenterhist = enterhist;
+ char OHIST = HIST;
+ bool otell = cantell;
+
+ struct Bin saveB;
+ sigset_t omask;
+ jmp_buf oldexit;
+
+ /* The (few) real local variables */
+ int my_reenter;
+
+ if (unit < 0)
+ return;
+ if (didfds)
+ donefds();
+ if (onlyown) {
+ struct stat stb;
+
+ if (fstat(unit, &stb) < 0) {
+ (void) close(unit);
+ return;
+ }
+ }
+
+ /*
+ * There is a critical section here while we are pushing down the input
+ * stream since we have stuff in different structures. If we weren't
+ * careful an interrupt could corrupt SHIN's Bin structure and kill the
+ * shell.
+ *
+ * We could avoid the critical region by grouping all the stuff in a single
+ * structure and pointing at it to move it all at once. This is less
+ * efficient globally on many variable references however.
+ */
+ insource = 1;
+ getexit(oldexit);
+ omask = 0;
+
+ if (setintr)
+ omask = sigblock(sigmask(SIGINT));
+ /* Setup the new values of the state stuff saved above */
+ bcopy((char *) &B, (char *) &(saveB), sizeof(B));
+ fbuf = NULL;
+ fseekp = feobp = fblocks = 0;
+ oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0;
+ intty = isatty(SHIN), whyles = 0, gointr = 0;
+ evalvec = 0;
+ evalp = 0;
+ enterhist = hflg;
+ if (enterhist)
+ HIST = '\0';
+
+ /*
+ * Now if we are allowing commands to be interrupted, we let ourselves be
+ * interrupted.
+ */
+ if (setintr)
+ (void) sigsetmask(omask);
+ settell();
+
+ if ((my_reenter = setexit()) == 0)
+ process(0); /* 0 -> blow away on errors */
+
+ if (setintr)
+ (void) sigsetmask(omask);
+ if (oSHIN >= 0) {
+ register int i;
+
+ /* We made it to the new state... free up its storage */
+ /* This code could get run twice but xfree doesn't care */
+ for (i = 0; i < fblocks; i++)
+ xfree((ptr_t) fbuf[i]);
+ xfree((ptr_t) fbuf);
+
+ /* Reset input arena */
+ bcopy((char *) &(saveB), (char *) &B, sizeof(B));
+
+ (void) close(SHIN), SHIN = oSHIN;
+ arginp = oarginp, onelflg = oonelflg;
+ evalp = oevalp, evalvec = oevalvec;
+ intty = oldintty, whyles = oldwhyl, gointr = ogointr;
+ if (enterhist)
+ HIST = OHIST;
+ enterhist = oenterhist;
+ cantell = otell;
+ }
+
+ resexit(oldexit);
+ /*
+ * If process reset() (effectively an unwind) then we must also unwind.
+ */
+ if (my_reenter)
+ stderror(ERR_SILENT);
+ insource = oinsource;
+}
+
+void
+rechist()
+{
+ Char buf[BUFSIZ];
+ int fp, ftmp, oldidfds;
+
+ if (!fast) {
+ if (value(STRsavehist)[0] == '\0')
+ return;
+ (void) Strcpy(buf, value(STRhome));
+ (void) Strcat(buf, STRsldthist);
+ fp = creat(short2str(buf), 0600);
+ if (fp == -1)
+ return;
+ oldidfds = didfds;
+ didfds = 0;
+ ftmp = SHOUT;
+ SHOUT = fp;
+ (void) Strcpy(buf, value(STRsavehist));
+ dumphist[2] = buf;
+ dohist(dumphist);
+ (void) close(fp);
+ SHOUT = ftmp;
+ didfds = oldidfds;
+ }
+}
+
+void
+goodbye()
+{
+ rechist();
+
+ if (loginsh) {
+ (void) signal(SIGQUIT, SIG_IGN);
+ (void) signal(SIGINT, SIG_IGN);
+ (void) signal(SIGTERM, SIG_IGN);
+ setintr = 0; /* No interrupts after "logout" */
+ if (!(adrof(STRlogout)))
+ set(STRlogout, STRnormal);
+#ifdef _PATH_DOTLOGOUT
+ (void) srcfile(_PATH_DOTLOGOUT, 0, 0);
+#endif
+ if (adrof(STRhome))
+ (void) srccat(value(STRhome), STRsldtlogout);
+ }
+ exitstat();
+}
+
+void
+exitstat()
+{
+
+#ifdef PROF
+ monitor(0);
+#endif
+ /*
+ * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
+ * directly because we poke child here. Otherwise we might continue
+ * unwarrantedly (sic).
+ */
+ child = 1;
+ xexit(getn(value(STRstatus)));
+}
+
+/*
+ * in the event of a HUP we want to save the history
+ */
+static void
+phup(sig)
+int sig;
+{
+ rechist();
+ xexit(sig);
+}
+
+Char *jobargv[2] = {STRjobs, 0};
+
+/*
+ * Catch an interrupt, e.g. during lexical input.
+ * If we are an interactive shell, we reset the interrupt catch
+ * immediately. In any case we drain the shell output,
+ * and finally go through the normal error mechanism, which
+ * gets a chance to make the shell go away.
+ */
+/* ARGSUSED */
+void
+pintr(notused)
+ int notused;
+{
+ pintr1(1);
+}
+
+void
+pintr1(wantnl)
+ bool wantnl;
+{
+ register Char **v;
+ sigset_t omask;
+
+ omask = sigblock((sigset_t) 0);
+ if (setintr) {
+ (void) sigsetmask(omask & ~sigmask(SIGINT));
+ if (pjobs) {
+ pjobs = 0;
+ xprintf("\n");
+ dojobs(jobargv);
+ stderror(ERR_NAME | ERR_INTR);
+ }
+ }
+ (void) sigsetmask(omask & ~sigmask(SIGCHLD));
+ draino();
+ (void) endpwent();
+
+ /*
+ * If we have an active "onintr" then we search for the label. Note that if
+ * one does "onintr -" then we shan't be interruptible so we needn't worry
+ * about that here.
+ */
+ if (gointr) {
+ search(T_GOTO, 0, gointr);
+ timflg = 0;
+ if (v = pargv)
+ pargv = 0, blkfree(v);
+ if (v = gargv)
+ gargv = 0, blkfree(v);
+ reset();
+ }
+ else if (intty && wantnl) {
+ (void) putraw('\r');
+ (void) putraw('\n');
+ }
+ stderror(ERR_SILENT);
+}
+
+/*
+ * Process is the main driving routine for the shell.
+ * It runs all command processing, except for those within { ... }
+ * in expressions (which is run by a routine evalav in sh.exp.c which
+ * is a stripped down process), and `...` evaluation which is run
+ * also by a subset of this code in sh.glob.c in the routine backeval.
+ *
+ * The code here is a little strange because part of it is interruptible
+ * and hence freeing of structures appears to occur when none is necessary
+ * if this is ignored.
+ *
+ * Note that if catch is not set then we will unwind on any error.
+ * If an end-of-file occurs, we return.
+ */
+void
+process(catch)
+ bool catch;
+{
+ jmp_buf osetexit;
+ struct command *t;
+
+ getexit(osetexit);
+ for (;;) {
+ pendjob();
+ paraml.next = paraml.prev = ¶ml;
+ paraml.word = STRNULL;
+ t = 0;
+ (void) setexit();
+ justpr = enterhist; /* execute if not entering history */
+
+ /*
+ * Interruptible during interactive reads
+ */
+ if (setintr)
+ (void) sigsetmask(sigblock((sigset_t) 0) & ~sigmask(SIGINT));
+
+ /*
+ * For the sake of reset()
+ */
+ freelex(¶ml);
+ freesyn(t);
+ t = 0;
+
+ if (haderr) {
+ if (!catch) {
+ /* unwind */
+ doneinp = 0;
+ resexit(osetexit);
+ reset();
+ }
+ haderr = 0;
+ /*
+ * Every error is eventually caught here or the shell dies. It is
+ * at this point that we clean up any left-over open files, by
+ * closing all but a fixed number of pre-defined files. Thus
+ * routines don't have to worry about leaving files open due to
+ * deeper errors... they will get closed here.
+ */
+ closem();
+ continue;
+ }
+ if (doneinp) {
+ doneinp = 0;
+ break;
+ }
+ if (chkstop)
+ chkstop--;
+ if (neednote)
+ pnote();
+ if (intty && prompt && evalvec == 0) {
+ mailchk();
+ /*
+ * If we are at the end of the input buffer then we are going to
+ * read fresh stuff. Otherwise, we are rereading input and don't
+ * need or want to prompt.
+ */
+ if (fseekp == feobp)
+ printprompt();
+ flush();
+ }
+ if (seterr) {
+ xfree((ptr_t) seterr);
+ seterr = NULL;
+ }
+
+ /*
+ * Echo not only on VERBOSE, but also with history expansion. If there
+ * is a lexical error then we forego history echo.
+ */
+ if (lex(¶ml) && !seterr && intty || adrof(STRverbose)) {
+ haderr = 1;
+ prlex(¶ml);
+ haderr = 0;
+ }
+
+ /*
+ * The parser may lose space if interrupted.
+ */
+ if (setintr)
+ (void) sigblock(sigmask(SIGINT));
+
+ /*
+ * Save input text on the history list if reading in old history, or it
+ * is from the terminal at the top level and not in a loop.
+ *
+ * PWP: entry of items in the history list while in a while loop is done
+ * elsewhere...
+ */
+ if (enterhist || catch && intty && !whyles)
+ savehist(¶ml);
+
+ /*
+ * Print lexical error messages, except when sourcing history lists.
+ */
+ if (!enterhist && seterr)
+ stderror(ERR_OLD);
+
+ /*
+ * If had a history command :p modifier then this is as far as we
+ * should go
+ */
+ if (justpr)
+ reset();
+
+ alias(¶ml);
+
+ /*
+ * Parse the words of the input into a parse tree.
+ */
+ t = syntax(paraml.next, ¶ml, 0);
+ if (seterr)
+ stderror(ERR_OLD);
+
+ execute(t, (tpgrp > 0 ? tpgrp : -1), NULL, NULL);
+
+ /*
+ * Made it!
+ */
+ freelex(¶ml);
+ freesyn(t);
+ }
+ resexit(osetexit);
+}
+
+void
+dosource(t)
+ register Char **t;
+{
+ register Char *f;
+ bool hflg = 0;
+ Char buf[BUFSIZ];
+
+ t++;
+ if (*t && eq(*t, STRmh)) {
+ if (*++t == NULL)
+ stderror(ERR_NAME | ERR_HFLAG);
+ hflg++;
+ }
+ (void) Strcpy(buf, *t);
+ f = globone(buf, G_ERROR);
+ (void) strcpy((char *) buf, short2str(f));
+ xfree((ptr_t) f);
+ if (!srcfile((char *) buf, 0, hflg) && !hflg)
+ stderror(ERR_SYSTEM, (char *) buf, strerror(errno));
+}
+
+/*
+ * Check for mail.
+ * If we are a login shell, then we don't want to tell
+ * about any mail file unless its been modified
+ * after the time we started.
+ * This prevents us from telling the user things he already
+ * knows, since the login program insists on saying
+ * "You have mail."
+ */
+static void
+mailchk()
+{
+ register struct varent *v;
+ register Char **vp;
+ time_t t;
+ int intvl, cnt;
+ struct stat stb;
+ bool new;
+
+ v = adrof(STRmail);
+ if (v == 0)
+ return;
+ (void) time(&t);
+ vp = v->vec;
+ cnt = blklen(vp);
+ intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
+ if (intvl < 1)
+ intvl = 1;
+ if (chktim + intvl > t)
+ return;
+ for (; *vp; vp++) {
+ if (stat(short2str(*vp), &stb) < 0)
+ continue;
+ new = stb.st_mtime > time0.tv_sec;
+ if (stb.st_size == 0 || stb.st_atime > stb.st_mtime ||
+ (stb.st_atime < chktim && stb.st_mtime < chktim) ||
+ loginsh && !new)
+ continue;
+ if (cnt == 1)
+ xprintf("You have %smail.\n", new ? "new " : "");
+ else
+ xprintf("%s in %s.\n", new ? "New mail" : "Mail", short2str(*vp));
+ }
+ chktim = t;
+}
+
+/*
+ * Extract a home directory from the password file
+ * The argument points to a buffer where the name of the
+ * user whose home directory is sought is currently.
+ * We write the home directory of the user back there.
+ */
+int
+gethdir(home)
+ Char *home;
+{
+ Char *h;
+ struct passwd *pw;
+
+ /*
+ * Is it us?
+ */
+ if (*home == '\0') {
+ if (h = value(STRhome)) {
+ (void) Strcpy(home, h);
+ return 0;
+ }
+ else
+ return 1;
+ }
+
+ if (pw = getpwnam(short2str(home))) {
+ (void) Strcpy(home, str2short(pw->pw_dir));
+ return 0;
+ }
+ else
+ return 1;
+}
+
+/*
+ * Move the initial descriptors to their eventual
+ * resting places, closin all other units.
+ */
+void
+initdesc()
+{
+
+ didfds = 0; /* 0, 1, 2 aren't set up */
+ (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL);
+ (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL);
+ (void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, NULL);
+ (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL);
+ closem();
+}
+
+
+void
+#ifdef PROF
+done(i)
+#else
+xexit(i)
+#endif
+ int i;
+{
+ untty();
+ _exit(i);
+}
+
+static Char **
+defaultpath()
+{
+ char *ptr;
+ Char **blk, **blkp;
+ struct stat stb;
+
+ blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10);
+
+#define DIRAPPEND(a) \
+ if (stat(ptr = a, &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFDIR) \
+ *blkp++ = SAVE(ptr)
+
+ DIRAPPEND(_PATH_BIN);
+ DIRAPPEND(_PATH_USRBIN);
+
+#undef DIRAPPEND
+
+ *blkp++ = Strsave(STRdot);
+ *blkp = NULL;
+ return (blk);
+}
+
+void
+printprompt()
+{
+ register Char *cp;
+
+ if (!whyles) {
+ for (cp = value(STRprompt); *cp; cp++)
+ if (*cp == HIST)
+ xprintf("%d", eventno + 1);
+ else {
+ if (*cp == '\\' && cp[1] == HIST)
+ cp++;
+ xputchar(*cp | QUOTE);
+ }
+ }
+ else
+ /*
+ * Prompt for forward reading loop body content.
+ */
+ xprintf("? ");
+ flush();
+}
projects / unix-history / commitdiff