about summary refs log tree commit diff
path: root/Src/init.c
blob: 6ad1e510013aaddb040e06772c3fafac7f7fba73 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
/*
 * init.c - main loop and initialization routines
 *
 * This file is part of zsh, the Z shell.
 *
 * Copyright (c) 1992-1997 Paul Falstad
 * All rights reserved.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and to distribute modified versions of this software for any
 * purpose, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * In no event shall Paul Falstad or the Zsh Development Group be liable
 * to any party for direct, indirect, special, incidental, or consequential
 * damages arising out of the use of this software and its documentation,
 * even if Paul Falstad and the Zsh Development Group have been advised of
 * the possibility of such damage.
 *
 * Paul Falstad and the Zsh Development Group specifically disclaim any
 * warranties, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose.  The software
 * provided hereunder is on an "as is" basis, and Paul Falstad and the
 * Zsh Development Group have no obligation to provide maintenance,
 * support, updates, enhancements, or modifications.
 *
 */

#include "zsh.mdh"

#include "zshpaths.h"
#include "zshxmods.h"

#include "init.pro"

/**/
int noexitct = 0;

/* what level of sourcing we are at */
 
/**/
int sourcelevel;

/* the shell tty fd */

/**/
int SHTTY;

/* the FILE attached to the shell tty */

/**/
FILE *shout;

/* termcap strings */
 
/**/
char *tcstr[TC_COUNT];

/* lengths of each termcap string */
 
/**/
int tclen[TC_COUNT];

/* Values of the li, co and am entries */

/**/
int tclines, tccolumns, hasam;

#ifdef DEBUG
/* depth of allocation type stack */

/**/
int alloc_stackp;
#endif

/* keep executing lists until EOF found */

/**/
void
loop(int toplevel, int justonce)
{
    List list;
#ifdef DEBUG
    int oasp = toplevel ? 0 : alloc_stackp;
#endif

    pushheap();
    for (;;) {
	freeheap();
	errflag = 0;
	if (isset(SHINSTDIN)) {
	    setblock_stdin();
	    if (interact)
		preprompt();
	}
	hbegin();		/* init history mech        */
	intr();			/* interrupts on            */
	lexinit();              /* initialize lexical state */
	if (!(list = parse_event())) {	/* if we couldn't parse a list */
	    hend();
	    if ((tok == ENDINPUT && !errflag) ||
		(tok == LEXERR && (!isset(SHINSTDIN) || !toplevel)) ||
		justonce)
		break;
	    continue;
	}
	if (hend()) {
	    int toksav = tok;
	    List prelist;

	    if (toplevel && (prelist = getshfunc("preexec")) != &dummy_list) {
		Histent he = gethistent(curhist);
		LinkList args;
		int osc = sfcontext;

		PERMALLOC {
		    args = newlinklist();
		    addlinknode(args, "preexec");
		    if (he && he->text)
			addlinknode(args, he->text);
		} LASTALLOC;
		sfcontext = SFC_HOOK;
		doshfunc("preexec", prelist, args, 0, 1);
		sfcontext = osc;
		freelinklist(args, (FreeFunc) NULL);
		errflag = 0;
	    }
	    if (stopmsg)	/* unset 'you have stopped jobs' flag */
		stopmsg--;
	    execlist(list, 0, 0);
	    tok = toksav;
	    if (toplevel)
		noexitct = 0;
	}
	DPUTS(alloc_stackp != oasp, "BUG: alloc_stackp changed in loop()");
	if (ferror(stderr)) {
	    zerr("write error", NULL, 0);
	    clearerr(stderr);
	}
	if (subsh)		/* how'd we get this far in a subshell? */
	    exit(lastval);
	if (((!interact || sourcelevel) && errflag) || retflag)
	    break;
	if (trapreturn) {
	    lastval = trapreturn;
	    trapreturn = 0;
	}
	if (isset(SINGLECOMMAND) && toplevel) {
	    if (sigtrapped[SIGEXIT])
		dotrap(SIGEXIT);
	    exit(lastval);
	}
	if (justonce)
	    break;
    }
    popheap();
}

static char *cmd;
static int restricted;

/**/
void
parseargs(char **argv)
{
    char **x;
    int action, optno;
    LinkList paramlist;
    int bourne = (emulation == EMULATE_KSH || emulation == EMULATE_SH);

    argzero = *argv++;
    SHIN = 0;

    /* There's a bit of trickery with opts[INTERACTIVE] here.  It starts *
     * at a value of 2 (instead of 1) or 0.  If it is explicitly set on  *
     * the command line, it goes to 1 or 0.  If input is coming from     *
     * somewhere that normally makes the shell non-interactive, we do    *
     * "opts[INTERACTIVE] &= 1", so that only a *default* on state will  *
     * be changed.  At the end of the function, a value of 2 gets        *
     * changed to 1.                                                     */
    opts[INTERACTIVE] = isatty(0) ? 2 : 0;
    opts[SHINSTDIN] = 0;
    opts[SINGLECOMMAND] = 0;

    /* loop through command line options (begins with "-" or "+") */
    while (*argv && (**argv == '-' || **argv == '+')) {
	action = (**argv == '-');
	if(!argv[0][1])
	    *argv = "--";
	while (*++*argv) {
	    /* The pseudo-option `--' signifies the end of options. *
	     * `-b' does too, csh-style, unless we're emulating a   *
	     * Bourne style shell.                                  */
	    if (**argv == '-' || (!bourne && **argv == 'b')) {
		argv++;
		goto doneoptions;
	    }

	    if (**argv == 'c') {         /* -c command */
		if (!*++argv) {
		    zerr("string expected after -c", NULL, 0);
		    exit(1);
		}
		cmd = *argv++;
		opts[INTERACTIVE] &= 1;
		opts[SHINSTDIN] = 0;
		goto doneoptions;
	    } else if (**argv == 'o') {
		if (!*++*argv)
		    argv++;
		if (!*argv) {
		    zerr("string expected after -o", NULL, 0);
		    exit(1);
		}
		if(!(optno = optlookup(*argv)))
		    zerr("no such option: %s", *argv, 0);
		else if (optno == RESTRICTED)
		    restricted = action;
		else
		    dosetopt(optno, action, 1);
		break;
	    } else {
	    	if (!(optno = optlookupc(**argv))) {
		    zerr("bad option: -%c", NULL, **argv);
		    exit(1);
		} else if (optno == RESTRICTED)
		    restricted = action;
		else
		    dosetopt(optno, action, 1);
	    }
	}
	argv++;
    }
    doneoptions:
    paramlist = newlinklist();
    if (*argv) {
	if (unset(SHINSTDIN)) {
	    argzero = *argv;
	    if (!cmd)
		SHIN = movefd(open(unmeta(argzero), O_RDONLY | O_NOCTTY));
	    if (SHIN == -1) {
		zerr("can't open input file: %s", argzero, 0);
		exit(1);
	    }
	    opts[INTERACTIVE] &= 1;
	    argv++;
	}
	while (*argv)
	    addlinknode(paramlist, ztrdup(*argv++));
    } else
	opts[SHINSTDIN] = 1;
    if(isset(SINGLECOMMAND))
	opts[INTERACTIVE] &= 1;
    opts[INTERACTIVE] = !!opts[INTERACTIVE];
    pparams = x = (char **) zcalloc((countlinknodes(paramlist) + 1) * sizeof(char *));

    while ((*x++ = (char *)getlinknode(paramlist)));
    free(paramlist);
    argzero = ztrdup(argzero);
}


/**/
void
init_io(void)
{
    long ttpgrp;
    static char outbuf[BUFSIZ], errbuf[BUFSIZ];

#ifdef RSH_BUG_WORKAROUND
    int i;
#endif

/* stdout, stderr fully buffered */
#ifdef _IOFBF
    setvbuf(stdout, outbuf, _IOFBF, BUFSIZ);
    setvbuf(stderr, errbuf, _IOFBF, BUFSIZ);
#else
    setbuffer(stdout, outbuf, BUFSIZ);
    setbuffer(stderr, errbuf, BUFSIZ);
#endif

/* This works around a bug in some versions of in.rshd. *
 * Currently this is not defined by default.            */
#ifdef RSH_BUG_WORKAROUND
    if (cmd) {
	for (i = 3; i < 10; i++)
	    close(i);
    }
#endif

    if (shout) {
	fclose(shout);
	shout = 0;
    }
    if (SHTTY != -1) {
	zclose(SHTTY);
	SHTTY = -1;
    }

    /* Make sure the tty is opened read/write. */
    if (isatty(0)) {
	zsfree(ttystrname);
	if ((ttystrname = ztrdup(ttyname(0)))) {
	    SHTTY = movefd(open(ttystrname, O_RDWR | O_NOCTTY));
#ifdef TIOCNXCL
	    /*
	     * See if the terminal claims to be busy.  If so, and fd 0
	     * is a terminal, try and set non-exclusive use for that.
	     * This is something to do with Solaris over-cleverness.
	     */
	    if (SHTTY == -1 && errno == EBUSY)
		ioctl(0, TIOCNXCL, 0);
#endif
	}
	/*
	 * xterm, rxvt and probably all terminal emulators except
	 * dtterm on Solaris 2.6 & 7 have a bug. Applications are
	 * unable to open /dev/tty or /dev/pts/<terminal number here>
	 * because something in Sun's STREAMS modules doesn't like
	 * it. The open() call fails with EBUSY which is not even
	 * listed as a possibility in the open(2) man page.  So we'll
	 * try to outsmart The Company.  -- <dave@srce.hr>
	 *
	 * Presumably there's no harm trying this on any OS, given that
	 * isatty(0) worked but opening the tty didn't.  Possibly we won't
	 * get the tty read/write, but it's the best we can do -- pws
	 *
	 * Try both stdin and stdout before trying /dev/tty. -- Bart
	 */
#if defined(HAVE_FCNTL_H) && defined(F_GETFL)
#define rdwrtty(fd)	((fcntl(fd, F_GETFL) & O_RDWR) == O_RDWR)
#else
#define rdwrtty(fd)	1
#endif
	if (SHTTY == -1 && rdwrtty(0)) {
	    SHTTY = movefd(dup(0));
	}
    }
    if (SHTTY == -1 && isatty(1) && rdwrtty(1) &&
	(SHTTY = movefd(dup(1))) != -1) {
	zsfree(ttystrname);
	ttystrname = ztrdup(ttyname(1));
    }
    if (SHTTY == -1 &&
	(SHTTY = movefd(open("/dev/tty", O_RDWR | O_NOCTTY))) != -1) {
	zsfree(ttystrname);
	ttystrname = ztrdup(ttyname(SHTTY));
    }
    if (SHTTY == -1) {
	zsfree(ttystrname);
	ttystrname = ztrdup("");
    } else if (!ttystrname) {
	ttystrname = ztrdup("/dev/tty");
    }

    /* We will only use zle if shell is interactive, *
     * SHTTY != -1, and shout != 0                   */
    if (interact && SHTTY != -1) {
	init_shout();
	if(!shout)
	    opts[USEZLE] = 0;
    } else
	opts[USEZLE] = 0;

#ifdef JOB_CONTROL
    /* If interactive, make the shell the foreground process */
    if (opts[MONITOR] && interact && (SHTTY != -1)) {
	attachtty(GETPGRP());
	if ((mypgrp = GETPGRP()) > 0) {
	    while ((ttpgrp = gettygrp()) != -1 && ttpgrp != mypgrp) {
		sleep(1);
		mypgrp = GETPGRP();
		if (mypgrp == gettygrp())
		    break;
		killpg(mypgrp, SIGTTIN);
		mypgrp = GETPGRP();
	    }
	} else
	    opts[MONITOR] = 0;
    } else
	opts[MONITOR] = 0;
#else
    opts[MONITOR] = 0;
#endif
}

/**/
void
init_shout(void)
{
    static char shoutbuf[BUFSIZ];
#if defined(JOB_CONTROL) && defined(TIOCSETD) && defined(NTTYDISC)
    int ldisc = NTTYDISC;

    ioctl(SHTTY, TIOCSETD, (char *)&ldisc);
#endif

    /* Associate terminal file descriptor with a FILE pointer */
    shout = fdopen(SHTTY, "w");
#ifdef _IOFBF
    setvbuf(shout, shoutbuf, _IOFBF, BUFSIZ);
#endif
  
    gettyinfo(&shttyinfo);	/* get tty state */
#if defined(__sgi)
    if (shttyinfo.tio.c_cc[VSWTCH] <= 0)	/* hack for irises */
	shttyinfo.tio.c_cc[VSWTCH] = CSWTCH;
#endif
}

/* names of the termcap strings we want */

static char *tccapnams[TC_COUNT] = {
    "cl", "le", "LE", "nd", "RI", "up", "UP", "do",
    "DO", "dc", "DC", "ic", "IC", "cd", "ce", "al", "dl", "ta",
    "md", "so", "us", "me", "se", "ue"
};

/* Initialise termcap */

/**/
int
init_term(void)
{
#ifndef TGETENT_ACCEPTS_NULL
    static char termbuf[2048];	/* the termcap buffer */
#endif

    if (!*term) {
	termflags |= TERM_UNKNOWN;
	return 0;
    }

    /* unset zle if using zsh under emacs */
    if (!strcmp(term, "emacs"))
	opts[USEZLE] = 0;

#ifdef TGETENT_ACCEPTS_NULL
    /* If possible, we let tgetent allocate its own termcap buffer */
    if (tgetent(NULL, term) != 1) {
#else
    if (tgetent(termbuf, term) != 1) {
#endif

	if (isset(INTERACTIVE))
	    zerr("can't find termcap info for %s", term, 0);
	errflag = 0;
	termflags |= TERM_BAD;
	return 0;
    } else {
	char tbuf[1024], *pp;
	int t0;

	termflags &= ~TERM_BAD;
	termflags &= ~TERM_UNKNOWN;
	for (t0 = 0; t0 != TC_COUNT; t0++) {
	    pp = tbuf;
	    zsfree(tcstr[t0]);
	/* AIX tgetstr() ignores second argument */
	    if (!(pp = tgetstr(tccapnams[t0], &pp)))
		tcstr[t0] = NULL, tclen[t0] = 0;
	    else {
		tclen[t0] = strlen(pp);
		tcstr[t0] = (char *) zalloc(tclen[t0] + 1);
		memcpy(tcstr[t0], pp, tclen[t0] + 1);
	    }
	}

	/* check whether terminal has automargin (wraparound) capability */
	hasam = tgetflag("am");

	tclines = tgetnum("li");
	tccolumns = tgetnum("co");

	/* if there's no termcap entry for cursor up, use single line mode: *
	 * this is flagged by termflags which is examined in zle_refresh.c  *
	 */
	if (tccan(TCUP))
	    termflags &= ~TERM_NOUP;
	else {
	    tcstr[TCUP] = NULL;
	    termflags |= TERM_NOUP;
	}

	/* if there's no termcap entry for cursor left, use \b. */
	if (!tccan(TCLEFT)) {
	    tcstr[TCLEFT] = ztrdup("\b");
	    tclen[TCLEFT] = 1;
	}

	/* if the termcap entry for down is \n, don't use it. */
	if (tccan(TCDOWN) && tcstr[TCDOWN][0] == '\n') {
	    tclen[TCDOWN] = 0;
	    zsfree(tcstr[TCDOWN]);
	    tcstr[TCDOWN] = NULL;
	}

	/* if there's no termcap entry for clear, use ^L. */
	if (!tccan(TCCLEARSCREEN)) {
	    tcstr[TCCLEARSCREEN] = ztrdup("\14");
	    tclen[TCCLEARSCREEN] = 1;
	}
    }
    return 1;
}

/* Initialize lots of global variables and hash tables */

/**/
void
setupvals(void)
{
#ifdef HAVE_GETPWUID
    struct passwd *pswd;
#endif
    struct timezone dummy_tz;
    char *ptr;
#ifdef HAVE_GETRLIMIT
    int i;
#endif

    noeval = 0;
    curhist = 0;
    histsiz = DEFAULT_HISTSIZE;
    inithist();

    cmdstack = (unsigned char *) zalloc(256);
    cmdsp = 0;

    bangchar = '!';
    hashchar = '#';
    hatchar = '^';
    termflags = TERM_UNKNOWN;
    curjob = prevjob = coprocin = coprocout = -1;
    gettimeofday(&shtimer, &dummy_tz);	/* init $SECONDS */
    srand((unsigned int)(shtimer.tv_sec + shtimer.tv_usec)); /* seed $RANDOM */

    hostnam     = (char *) zalloc(256);
    gethostname(hostnam, 256);

    /* Set default path */
    path    = (char **) zalloc(sizeof(*path) * 5);
    path[0] = ztrdup("/bin");
    path[1] = ztrdup("/usr/bin");
    path[2] = ztrdup("/usr/ucb");
    path[3] = ztrdup("/usr/local/bin");
    path[4] = NULL;

    cdpath   = mkarray(NULL);
    manpath  = mkarray(NULL);
    fignore  = mkarray(NULL);
    fpath    = mkarray(NULL);
    mailpath = mkarray(NULL);
    watch    = mkarray(NULL);
    psvar    = mkarray(NULL);
#ifdef DYNAMIC
    module_path = mkarray(ztrdup(MODULE_DIR));
    modules = newlinklist();
#endif
    bltinmodules = newlinklist();

    /* Set default prompts */
    if(unset(INTERACTIVE)) {
	prompt = ztrdup("");
	prompt2 = ztrdup("");
    } else if (emulation == EMULATE_KSH || emulation == EMULATE_SH) {
	prompt  = ztrdup(privasserted() ? "# " : "$ ");
	prompt2 = ztrdup("> ");
    } else {
	prompt  = ztrdup("%m%# ");
	prompt2 = ztrdup("%_> ");
    }
    prompt3 = ztrdup("?# ");
    prompt4 = ztrdup("+ ");
    sprompt = ztrdup("zsh: correct '%R' to '%r' [nyae]? ");

    ifs         = ztrdup(DEFAULT_IFS);
    wordchars   = ztrdup(DEFAULT_WORDCHARS);
    postedit    = ztrdup("");
    underscore  = ztrdup("");

    zoptarg = ztrdup("");
    zoptind = 1;

    ppid  = (long) getppid();
    mypid = (long) getpid();
    term  = ztrdup("");

    /* The following variable assignments cause zsh to behave more *
     * like Bourne and Korn shells when invoked as "sh" or "ksh".  *
     * NULLCMD=":" and READNULLCMD=":"                             */

    if (emulation == EMULATE_KSH || emulation == EMULATE_SH) {
	nullcmd     = ztrdup(":");
	readnullcmd = ztrdup(":");
    } else {
	nullcmd     = ztrdup("cat");
	readnullcmd = ztrdup("more");
    }

    /* We cache the uid so we know when to *
     * recheck the info for `USERNAME'     */
    cached_uid = getuid();

    /* Get password entry and set info for `HOME' and `USERNAME' */
#ifdef HAVE_GETPWUID
    if ((pswd = getpwuid(cached_uid))) {
	home = metafy(pswd->pw_dir, -1, META_DUP);
	cached_username = ztrdup(pswd->pw_name);
    } else
#endif /* HAVE_GETPWUID */
	   {
	home = ztrdup("/");
	cached_username = ztrdup("");
    }

    /* Try a cheap test to see if we can *
     * initialize `PWD' from `HOME'      */
    if (ispwd(home))
	pwd = ztrdup(home);
    else if ((ptr = zgetenv("PWD")) && ispwd(ptr))
	pwd = ztrdup(ptr);
    else
	pwd = metafy(zgetcwd(), -1, META_DUP);

    oldpwd = ztrdup(pwd);  /* initialize `OLDPWD' = `PWD' */

    inittyptab();     /* initialize the ztypes table */
    initlextabs();    /* initialize lexing tables    */

    createreswdtable();     /* create hash table for reserved words    */
    createaliastable();     /* create hash table for aliases           */
    createcmdnamtable();    /* create hash table for external commands */
    createshfunctable();    /* create hash table for shell functions   */
    createbuiltintable();   /* create hash table for builtin commands  */
    createnameddirtable();  /* create hash table for named directories */
    createparamtable();     /* create paramater hash table             */

    condtab = NULL;
    wrappers = NULL;

#ifdef TIOCGWINSZ
    adjustwinsize();
#else
    /* Using zero below sets the defaults from termcap */
    setiparam("COLUMNS", 0);
    setiparam("LINES", 0);
#endif

#ifdef HAVE_GETRLIMIT
    for (i = 0; i != RLIM_NLIMITS; i++) {
	getrlimit(i, current_limits + i);
	limits[i] = current_limits[i];
    }
#endif

    breaks = loops = 0;
    lastmailcheck = time(NULL);
    locallevel = sourcelevel = 0;
    sfcontext = SFC_DIRECT;
    trapreturn = 0;
    noerrexit = -1;
    nohistsave = 1;
    dirstack = newlinklist();
    bufstack = newlinklist();
    prepromptfns = newlinklist();
    hsubl = hsubr = NULL;
    lastpid = 0;
    bshin = SHIN ? fdopen(SHIN, "r") : stdin;
    if (isset(SHINSTDIN) && !SHIN && unset(INTERACTIVE)) {
#ifdef _IONBF
	setvbuf(stdin, NULL, _IONBF, 0);
#else
	setlinebuf(stdin);
#endif
    }

    times(&shtms);
}

/* Initialize signal handling */

/**/
void
init_signals(void)
{
    intr();

#ifndef QDEBUG
    signal_ignore(SIGQUIT);
#endif

    install_handler(SIGHUP);
    install_handler(SIGCHLD);
#ifdef SIGWINCH
    install_handler(SIGWINCH);
#endif
    if (interact) {
	install_handler(SIGALRM);
	signal_ignore(SIGTERM);
    }
    if (jobbing) {
	long ttypgrp;

	while ((ttypgrp = gettygrp()) != -1 && ttypgrp != mypgrp)
	    kill(0, SIGTTIN);
	if (ttypgrp == -1) {
	    opts[MONITOR] = 0;
	} else {
	    signal_ignore(SIGTTOU);
	    signal_ignore(SIGTSTP);
	    signal_ignore(SIGTTIN);
	    attachtty(mypgrp);
	}
    }
    if (islogin) {
	signal_setmask(signal_mask(0));
    } else if (interact) {
	sigset_t set;

	sigemptyset(&set);
	sigaddset(&set, SIGINT);
	sigaddset(&set, SIGQUIT);
	signal_unblock(set);
    }
}

/* Source the init scripts.  If called as "ksh" or "sh"  *
 * then we source the standard sh/ksh scripts instead of *
 * the standard zsh scripts                              */

/**/
void
run_init_scripts(void)
{
    noerrexit = -1;

    if (emulation == EMULATE_KSH || emulation == EMULATE_SH) {
	if (islogin)
	    source("/etc/profile");
	if (unset(PRIVILEGED)) {
	    char *s = getsparam("ENV");
	    if (islogin)
		sourcehome(".profile");
	    noerrs = 2;
	    if (s && !parsestr(s)) {
		singsub(&s);
		noerrs = 0;
		source(s);
	    }
	    noerrs = 0;
	} else
	    source("/etc/suid_profile");
    } else {
#ifdef GLOBAL_ZSHENV
	source(GLOBAL_ZSHENV);
#endif
	if (isset(RCS)) {
	    int globalfirst = isset(GLOBALRCSFIRST);
	    if (globalfirst) {
#ifdef GLOBAL_ZPROFILE
		if (islogin)
		    source(GLOBAL_ZPROFILE);
#endif
#ifdef GLOBAL_ZSHRC
		if (interact)
		    source(GLOBAL_ZSHRC);
#endif
#ifdef GLOBAL_ZLOGIN
		if (islogin)
		    source(GLOBAL_ZLOGIN);
#endif
	    }
	    if (unset(PRIVILEGED))
		sourcehome(".zshenv");
	    if (islogin) {
#ifdef GLOBAL_ZPROFILE
		if (!globalfirst)
		    source(GLOBAL_ZPROFILE);
#endif
		if (unset(PRIVILEGED))
		    sourcehome(".zprofile");
	    }
	    if (interact) {
#ifdef GLOBAL_ZSHRC
		if (!globalfirst)
		    source(GLOBAL_ZSHRC);
#endif
		if (unset(PRIVILEGED))
		    sourcehome(".zshrc");
	    }
	    if (islogin) {
#ifdef GLOBAL_ZLOGIN
		if (!globalfirst)
		    source(GLOBAL_ZLOGIN);
#endif
		if (unset(PRIVILEGED))
		    sourcehome(".zlogin");
	    }
	}
    }
    noerrexit = 0;
    nohistsave = 0;
}

/* Miscellaneous initializations that happen after init scripts are run */

/**/
void
init_misc(void)
{
#ifndef RESTRICTED_R
    if ( restricted )
#else
    if (*zsh_name == 'r' || restricted)
#endif
	dosetopt(RESTRICTED, 1, 0);
    if (cmd) {
	if (SHIN >= 10)
	    fclose(bshin);
	SHIN = movefd(open("/dev/null", O_RDONLY | O_NOCTTY));
	bshin = fdopen(SHIN, "r");
	execstring(cmd, 0, 1);
	stopmsg = 1;
	zexit(lastval, 0);
    }

    if (interact && isset(RCS))
	readhistfile(getsparam("HISTFILE"), 0);
}

/* source a file */

/**/
int
source(char *s)
{
    int tempfd, fd, cj, oldlineno;
    int oldshst, osubsh, oloops;
    FILE *obshin;
    char *old_scriptname = scriptname;

    if (!s || (tempfd = movefd(open(unmeta(s), O_RDONLY | O_NOCTTY))) == -1) {
	return 1;
    }

    /* save the current shell state */
    fd        = SHIN;            /* store the shell input fd                  */
    obshin    = bshin;          /* store file handle for buffered shell input */
    osubsh    = subsh;           /* store whether we are in a subshell        */
    cj        = thisjob;         /* store our current job number              */
    oldlineno = lineno;          /* store our current lineno                  */
    oloops    = loops;           /* stored the # of nested loops we are in    */
    oldshst   = opts[SHINSTDIN]; /* store current value of this option        */

    SHIN = tempfd;
    bshin = fdopen(SHIN, "r");
    subsh  = 0;
    lineno = 0;
    loops  = 0;
    dosetopt(SHINSTDIN, 0, 1);
    scriptname = s;

    sourcelevel++;
    loop(0, 0);			/* loop through the file to be sourced        */
    sourcelevel--;
    fclose(bshin);
    fdtable[SHIN] = 0;

    /* restore the current shell state */
    SHIN = fd;                       /* the shell input fd                   */
    bshin = obshin;                  /* file handle for buffered shell input */
    subsh = osubsh;                  /* whether we are in a subshell         */
    thisjob = cj;                    /* current job number                   */
    lineno = oldlineno;              /* our current lineno                   */
    loops = oloops;                  /* the # of nested loops we are in      */
    dosetopt(SHINSTDIN, oldshst, 1); /* SHINSTDIN option                     */
    errflag = 0;
    retflag = 0;
    scriptname = old_scriptname;

    return 0;
}

/* Try to source a file in the home directory */

/**/
void
sourcehome(char *s)
{
    char buf[PATH_MAX];
    char *h;

    if (emulation == EMULATE_SH || emulation == EMULATE_KSH ||
	!(h = getsparam("ZDOTDIR")))
	h = home;
    if (strlen(h) + strlen(s) + 1 >= PATH_MAX) {
	zerr("path too long: %s", s, 0);
	return;
    }
    sprintf(buf, "%s/%s", h, s);
    source(buf);
}

/**/
void
init_bltinmods(void)
{
    static struct module mod = { NULL, 0, NULL, NULL };
#include "bltinmods.list"
    mod.nam = NULL;
}

/**/
void
noop_function(void)
{
    /* do nothing */
}

/**/
void
noop_function_int(int nothing)
{
    /* do nothing */
}

/* ZLE entry point pointers.  They are defined here because the initial *
 * values depend on whether ZLE is linked in or not -- if it is, we     *
 * avoid wasting space with the fallback functions.  No other source    *
 * file needs to know which modules are linked in.                      */

#ifdef LINKED_XMOD_zle

/**/
ZleVoidFn trashzleptr = noop_function;
/**/
ZleVoidFn gotwordptr;
/**/
ZleVoidFn refreshptr;
/**/
ZleVoidIntFn spaceinlineptr;
/**/
ZleReadFn zlereadptr;

#else /* !LINKED_XMOD_zle */

ZleVoidFn trashzleptr = noop_function;
ZleVoidFn gotwordptr = noop_function;
ZleVoidFn refreshptr = noop_function;
ZleVoidIntFn spaceinlineptr = noop_function_int;
# ifdef UNLINKED_XMOD_zle
ZleReadFn zlereadptr = autoload_zleread;
# else /* !UNLINKED_XMOD_zle */
ZleReadFn zlereadptr = fallback_zleread;
# endif /* !UNLINKED_XMOD_zle */

/**/
# ifdef UNLINKED_XMOD_zle

/**/
static unsigned char *
autoload_zleread(char *lp, char *rp, int ha)
{
    zlereadptr = fallback_zleread;
    load_module("zle");
    return zleread(lp, rp, ha);
}

/**/
# endif /* UNLINKED_XMOD_zle */

/**/
unsigned char *
fallback_zleread(char *lp, char *rp, int ha)
{
    char *pptbuf;
    int pptlen;

    pptbuf = unmetafy(promptexpand(lp, 0, NULL, NULL), &pptlen);
    write(2, (WRITE_ARG_2_T)pptbuf, pptlen);
    free(pptbuf);
    return (unsigned char *)shingetline();
}

#endif /* !LINKED_XMOD_zle */

/* compctl entry point pointers.  Similar to the ZLE ones. */

#ifdef LINKED_XMOD_comp1

/**/
CompctlReadFn compctlreadptr;

#else /* !LINKED_XMOD_comp1 */

CompctlReadFn compctlreadptr = fallback_compctlread;

/**/
int
fallback_compctlread(char *name, char **args, char *ops, char *reply)
{
    zwarnnam(name, "option valid only in functions called from completion",
	    NULL, 0);
    return 1;
}

#endif /* !LINKED_XMOD_comp1 */