sh.glob.c revision 83098 
1/* $Header: /src/pub/tcsh/sh.glob.c,v 3.48 2001/01/04 18:51:57 christos Exp $ */
2/*
3 * sh.glob.c: Regular expression expansion
4 */
5/*-
6 * Copyright (c) 1980, 1991 The Regents of the University of California.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37#include "sh.h"
38
39RCSID("$Id: sh.glob.c,v 3.48 2001/01/04 18:51:57 christos Exp $")
40
41#include "tc.h"
42
43#include "glob.h"
44
45static int noglob;
46static int pargsiz, gargsiz;
47
48/*
49 * Values for gflag
50 */
51#define	G_NONE	0		/* No globbing needed			*/
52#define	G_GLOB	1		/* string contains *?[] characters	*/
53#define	G_CSH	2		/* string contains ~`{ characters	*/
54
55#define	GLOBSPACE	100	/* Alloc increment			*/
56#define LONGBSIZE	10240	/* Backquote expansion buffer size	*/
57
58
59#define LBRC '{'
60#define RBRC '}'
61#define LBRK '['
62#define RBRK ']'
63#define EOS '\0'
64
65Char  **gargv = NULL;
66int     gargc = 0;
67Char  **pargv = NULL;
68static int pargc = 0;
69
70/*
71 * globbing is now done in two stages. In the first pass we expand
72 * csh globbing idioms ~`{ and then we proceed doing the normal
73 * globbing if needed ?*[
74 *
75 * Csh type globbing is handled in globexpand() and the rest is
76 * handled in glob() which is part of the 4.4BSD libc.
77 *
78 */
79static	Char	 *globtilde	__P((Char **, Char *));
80static	Char     *handleone	__P((Char *, Char **, int));
81static	Char	**libglob	__P((Char **));
82static	Char	**globexpand	__P((Char **));
83static	int	  globbrace	__P((Char *, Char *, Char ***));
84static  void	  expbrace	__P((Char ***, Char ***, int));
85static  int	  pmatch	__P((Char *, Char *, Char **));
86static	void	  pword		__P((int));
87static	void	  psave		__P((int));
88static	void	  backeval	__P((Char *, bool));
89
90static Char *
91globtilde(nv, s)
92    Char  **nv, *s;
93{
94    Char    gbuf[BUFSIZE], *gstart, *b, *u, *e;
95#ifdef apollo
96    int slash;
97#endif
98
99    gstart = gbuf;
100    *gstart++ = *s++;
101    u = s;
102    for (b = gstart, e = &gbuf[BUFSIZE - 1];
103	 *s && *s != '/' && *s != ':' && b < e;
104	 *b++ = *s++)
105	continue;
106    *b = EOS;
107    if (gethdir(gstart)) {
108	if (adrof(STRnonomatch))
109	    return (--u);
110	blkfree(nv);
111	if (*gstart)
112	    stderror(ERR_UNKUSER, short2str(gstart));
113	else
114	    stderror(ERR_NOHOME);
115    }
116    b = &gstart[Strlen(gstart)];
117#ifdef apollo
118    slash = gstart[0] == '/' && gstart[1] == '\0';
119#endif
120    while (*s)
121	*b++ = *s++;
122    *b = EOS;
123    --u;
124    xfree((ptr_t) u);
125#ifdef apollo
126    if (slash && gstart[1] == '/')
127	gstart++;
128#endif
129    return (Strsave(gstart));
130}
131
132Char *
133globequal(new, old)
134    Char *new, *old;
135{
136    int     dig;
137    Char    *b, *d;
138
139    /*
140     * kfk - 17 Jan 1984 - stack hack allows user to get at arbitrary dir names
141     * in stack. PWP: let =foobar pass through (for X windows)
142     */
143    if (old[1] == '-' && (old[2] == '\0' || old[2] == '/')) {
144	/* =- */
145	dig = -1;
146	b = &old[2];
147    }
148    else if (Isdigit(old[1])) {
149	/* =<number> */
150	dig = old[1] - '0';
151	for (b = &old[2]; Isdigit(*b); b++)
152	    dig = dig * 10 + (*b - '0');
153	if (*b != '\0' && *b != '/')
154	    /* =<number>foobar */
155	    return old;
156    }
157    else
158	/* =foobar */
159	return old;
160
161    if (!getstakd(new, dig))
162	return NULL;
163
164    /* Copy the rest of the string */
165    for (d = &new[Strlen(new)];
166	 d < &new[BUFSIZE - 1] && (*d++ = *b++) != '\0';)
167	continue;
168    *d = '\0';
169
170    return new;
171}
172
173static int
174globbrace(s, p, bl)
175    Char   *s, *p, ***bl;
176{
177    int     i, len;
178    Char   *pm, *pe, *lm, *pl;
179    Char  **nv, **vl;
180    Char    gbuf[BUFSIZE];
181    int     size = GLOBSPACE;
182
183    nv = vl = (Char **) xmalloc((size_t) (sizeof(Char *) * size));
184    *vl = NULL;
185
186    len = 0;
187    /* copy part up to the brace */
188    for (lm = gbuf, p = s; *p != LBRC; *lm++ = *p++)
189	continue;
190
191    /* check for balanced braces */
192    for (i = 0, pe = ++p; *pe; pe++)
193#ifdef DSPMBYTE
194	if (Ismbyte1(*pe) && *(pe + 1) != EOS)
195	    pe ++;
196	else
197#endif /* DSPMBYTE */
198	if (*pe == LBRK) {
199	    /* Ignore everything between [] */
200	    for (++pe; *pe != RBRK && *pe != EOS; pe++)
201#ifdef DSPMBYTE
202	      if (Ismbyte1(*pe) && *(pe + 1) != EOS)
203		pe ++;
204	      else
205#endif /* DSPMBYTE */
206		continue;
207	    if (*pe == EOS) {
208		blkfree(nv);
209		return (-RBRK);
210	    }
211	}
212	else if (*pe == LBRC)
213	    i++;
214	else if (*pe == RBRC) {
215	    if (i == 0)
216		break;
217	    i--;
218	}
219
220    if (i != 0 || *pe == '\0') {
221	blkfree(nv);
222	return (-RBRC);
223    }
224
225    for (i = 0, pl = pm = p; pm <= pe; pm++)
226#ifdef DSPMBYTE
227	if (Ismbyte1(*pm) && pm + 1 <= pe)
228	    pm ++;
229	else
230#endif /* DSPMBYTE */
231	switch (*pm) {
232	case LBRK:
233	    for (++pm; *pm != RBRK && *pm != EOS; pm++)
234#ifdef DSPMBYTE
235	      if (Ismbyte1(*pm) && *(pm + 1) != EOS)
236		pm ++;
237	      else
238#endif /* DSPMBYTE */
239		continue;
240	    if (*pm == EOS) {
241		*vl = NULL;
242		blkfree(nv);
243		return (-RBRK);
244	    }
245	    break;
246	case LBRC:
247	    i++;
248	    break;
249	case RBRC:
250	    if (i) {
251		i--;
252		break;
253	    }
254	    /* FALLTHROUGH */
255	case ',':
256	    if (i && *pm == ',')
257		break;
258	    else {
259		Char    savec = *pm;
260
261		*pm = EOS;
262		(void) Strcpy(lm, pl);
263		(void) Strcat(gbuf, pe + 1);
264		*pm = savec;
265		*vl++ = Strsave(gbuf);
266		len++;
267		pl = pm + 1;
268		if (vl == &nv[size]) {
269		    size += GLOBSPACE;
270		    nv = (Char **) xrealloc((ptr_t) nv,
271					    (size_t) (size * sizeof(Char *)));
272		    vl = &nv[size - GLOBSPACE];
273		}
274	    }
275	    break;
276	default:
277	    break;
278	}
279    *vl = NULL;
280    *bl = nv;
281    return (len);
282}
283
284
285static void
286expbrace(nvp, elp, size)
287    Char ***nvp, ***elp;
288    int size;
289{
290    Char **vl, **el, **nv, *s;
291
292    vl = nv = *nvp;
293    if (elp != NULL)
294	el = *elp;
295    else
296	for (el = vl; *el; el++)
297	    continue;
298
299    for (s = *vl; s; s = *++vl) {
300	Char   *b;
301	Char  **vp, **bp;
302
303	/* leave {} untouched for find */
304	if (s[0] == '{' && (s[1] == '\0' || (s[1] == '}' && s[2] == '\0')))
305	    continue;
306	if ((b = Strchr(s, '{')) != NULL) {
307	    Char  **bl;
308	    int     len;
309
310#if defined (DSPMBYTE)
311	    if (b != s && Ismbyte2(*b) && Ismbyte1(*(b-1))) {
312		/* The "{" is the 2nd byte of a MB character */
313		continue;
314	    }
315#endif /* DSPMBYTE */
316	    if ((len = globbrace(s, b, &bl)) < 0) {
317		xfree((ptr_t) nv);
318		stderror(ERR_MISSING, -len);
319	    }
320	    xfree((ptr_t) s);
321	    if (len == 1) {
322		*vl-- = *bl;
323		xfree((ptr_t) bl);
324		continue;
325	    }
326	    if (&el[len] >= &nv[size]) {
327		int     l, e;
328		l = (int) (&el[len] - &nv[size]);
329		size += GLOBSPACE > l ? GLOBSPACE : l;
330		l = (int) (vl - nv);
331		e = (int) (el - nv);
332		nv = (Char **) xrealloc((ptr_t) nv,
333					(size_t) (size * sizeof(Char *)));
334		vl = nv + l;
335		el = nv + e;
336	    }
337	    /* nv vl   el     bl
338	     * |  |    |      |
339	     * -.--..--	      x--
340	     *   |            len
341	     *   vp
342	     */
343	    vp = vl--;
344	    *vp = *bl;
345	    len--;
346	    for (bp = el; bp != vp; bp--)
347		bp[len] = *bp;
348	    el += len;
349	    /* nv vl    el bl
350	     * |  |     |  |
351	     * -.-x  ---    --
352	     *   |len
353	     *   vp
354	     */
355	    vp++;
356	    for (bp = bl + 1; *bp; *vp++ = *bp++)
357		continue;
358	    xfree((ptr_t) bl);
359	}
360
361    }
362    if (elp != NULL)
363	*elp = el;
364    *nvp = nv;
365}
366
367static Char **
368globexpand(v)
369    Char  **v;
370{
371    Char   *s;
372    Char  **nv, **vl, **el;
373    int     size = GLOBSPACE;
374
375
376    nv = vl = (Char **) xmalloc((size_t) (sizeof(Char *) * size));
377    *vl = NULL;
378
379    /*
380     * Step 1: expand backquotes.
381     */
382    while ((s = *v++) != '\0') {
383	if (Strchr(s, '`')) {
384	    int     i;
385
386	    (void) dobackp(s, 0);
387	    for (i = 0; i < pargc; i++) {
388		*vl++ = pargv[i];
389		if (vl == &nv[size]) {
390		    size += GLOBSPACE;
391		    nv = (Char **) xrealloc((ptr_t) nv,
392					    (size_t) (size * sizeof(Char *)));
393		    vl = &nv[size - GLOBSPACE];
394		}
395	    }
396	    xfree((ptr_t) pargv);
397	    pargv = NULL;
398	}
399	else {
400	    *vl++ = Strsave(s);
401	    if (vl == &nv[size]) {
402		size += GLOBSPACE;
403		nv = (Char **) xrealloc((ptr_t) nv,
404					(size_t) (size * sizeof(Char *)));
405		vl = &nv[size - GLOBSPACE];
406	    }
407	}
408    }
409    *vl = NULL;
410
411    if (noglob)
412	return (nv);
413
414    /*
415     * Step 2: expand braces
416     */
417    el = vl;
418    expbrace(&nv, &el, size);
419
420
421    /*
422     * Step 3: expand ~ =
423     */
424    vl = nv;
425    for (s = *vl; s; s = *++vl)
426	switch (*s) {
427	    Char gp[BUFSIZE], *ns;
428	case '~':
429	    *vl = globtilde(nv, s);
430	    break;
431	case '=':
432	    if ((ns = globequal(gp, s)) == NULL) {
433		if (!adrof(STRnonomatch)) {
434		    /* Error */
435		    blkfree(nv);
436		    stderror(ERR_DEEP);
437		}
438	    }
439	    if (ns && ns != s) {
440		/* Expansion succeeded */
441		xfree((ptr_t) s);
442		*vl = Strsave(gp);
443	    }
444	    break;
445	default:
446	    break;
447	}
448    vl = nv;
449
450    /*
451     * Step 4: expand .. if the variable symlinks==expand is set
452     */
453    if (symlinks == SYM_EXPAND) {
454	for (s = *vl; s; s = *++vl) {
455	    *vl = dnormalize(s, 1);
456	    xfree((ptr_t) s);
457	}
458    }
459    vl = nv;
460
461    return (vl);
462}
463
464static Char *
465handleone(str, vl, action)
466    Char   *str, **vl;
467    int     action;
468{
469
470    Char   **vlp = vl;
471    int chars;
472    Char **t, *p, *strp;
473
474    switch (action) {
475    case G_ERROR:
476	setname(short2str(str));
477	blkfree(vl);
478	stderror(ERR_NAME | ERR_AMBIG);
479	break;
480    case G_APPEND:
481	chars = 0;
482	for (t = vlp; (p = *t++) != '\0'; chars++)
483	    while (*p++)
484		chars++;
485	str = (Char *)xmalloc((size_t)(chars * sizeof(Char)));
486	for (t = vlp, strp = str; (p = *t++) != '\0'; chars++) {
487	    while (*p)
488		 *strp++ = *p++ & TRIM;
489	    *strp++ = ' ';
490	}
491	*--strp = '\0';
492	blkfree(vl);
493	break;
494    case G_IGNORE:
495	str = Strsave(strip(*vlp));
496	blkfree(vl);
497	break;
498    default:
499	break;
500    }
501    return (str);
502}
503
504static Char **
505libglob(vl)
506    Char  **vl;
507{
508    int     gflgs = GLOB_QUOTE | GLOB_NOMAGIC | GLOB_ALTNOT;
509    glob_t  globv;
510    char   *ptr;
511    int     nonomatch = adrof(STRnonomatch) != 0, magic = 0, match = 0;
512
513    if (!vl || !vl[0])
514	return(vl);
515
516    globv.gl_offs = 0;
517    globv.gl_pathv = 0;
518    globv.gl_pathc = 0;
519
520    if (nonomatch)
521	gflgs |= GLOB_NOCHECK;
522
523    do {
524	ptr = short2qstr(*vl);
525	switch (glob(ptr, gflgs, 0, &globv)) {
526	case GLOB_ABEND:
527	    globfree(&globv);
528	    setname(ptr);
529	    stderror(ERR_NAME | ERR_GLOB);
530	    /* NOTREACHED */
531	case GLOB_NOSPACE:
532	    globfree(&globv);
533	    stderror(ERR_NOMEM);
534	    /* NOTREACHED */
535	default:
536	    break;
537	}
538	if (globv.gl_flags & GLOB_MAGCHAR) {
539	    match |= (globv.gl_matchc != 0);
540	    magic = 1;
541	}
542	gflgs |= GLOB_APPEND;
543    }
544    while (*++vl);
545    vl = (globv.gl_pathc == 0 || (magic && !match && !nonomatch)) ?
546	NULL : blk2short(globv.gl_pathv);
547    globfree(&globv);
548    return (vl);
549}
550
551Char   *
552globone(str, action)
553    Char   *str;
554    int     action;
555{
556
557    Char   *v[2], **vl, **vo;
558    int gflg;
559
560    noglob = adrof(STRnoglob) != 0;
561    gflag = 0;
562    v[0] = str;
563    v[1] = 0;
564    tglob(v);
565    gflg = gflag;
566    if (gflg == G_NONE)
567	return (strip(Strsave(str)));
568
569    if (gflg & G_CSH) {
570	/*
571	 * Expand back-quote, tilde and brace
572	 */
573	vo = globexpand(v);
574	if (noglob || (gflg & G_GLOB) == 0) {
575	    if (vo[0] == NULL) {
576		xfree((ptr_t) vo);
577		return (Strsave(STRNULL));
578	    }
579	    if (vo[1] != NULL)
580		return (handleone(str, vo, action));
581	    else {
582		str = strip(vo[0]);
583		xfree((ptr_t) vo);
584		return (str);
585	    }
586	}
587    }
588    else if (noglob || (gflg & G_GLOB) == 0)
589	return (strip(Strsave(str)));
590    else
591	vo = v;
592
593    vl = libglob(vo);
594    if ((gflg & G_CSH) && vl != vo)
595	blkfree(vo);
596    if (vl == NULL) {
597	setname(short2str(str));
598	stderror(ERR_NAME | ERR_NOMATCH);
599    }
600    if (vl[0] == NULL) {
601	xfree((ptr_t) vl);
602	return (Strsave(STRNULL));
603    }
604    if (vl[1])
605	return (handleone(str, vl, action));
606    else {
607	str = strip(*vl);
608	xfree((ptr_t) vl);
609	return (str);
610    }
611}
612
613Char  **
614globall(v)
615    Char  **v;
616{
617    Char  **vl, **vo;
618    int gflg = gflag;
619
620    if (!v || !v[0]) {
621	gargv = saveblk(v);
622	gargc = blklen(gargv);
623	return (gargv);
624    }
625
626    noglob = adrof(STRnoglob) != 0;
627
628    if (gflg & G_CSH)
629	/*
630	 * Expand back-quote, tilde and brace
631	 */
632	vl = vo = globexpand(v);
633    else
634	vl = vo = saveblk(v);
635
636    if (!noglob && (gflg & G_GLOB)) {
637	vl = libglob(vo);
638	if (vl != vo)
639	    blkfree(vo);
640    }
641    else
642	trim(vl);
643
644    gargc = vl ? blklen(vl) : 0;
645    return (gargv = vl);
646}
647
648void
649ginit()
650{
651    gargsiz = GLOBSPACE;
652    gargv = (Char **) xmalloc((size_t) (sizeof(Char *) * gargsiz));
653    gargv[0] = 0;
654    gargc = 0;
655}
656
657void
658rscan(t, f)
659    register Char **t;
660    void    (*f) __P((int));
661{
662    register Char *p;
663
664    while ((p = *t++) != '\0')
665	while (*p)
666	    (*f) (*p++);
667}
668
669void
670trim(t)
671    register Char **t;
672{
673    register Char *p;
674
675    while ((p = *t++) != '\0')
676	while (*p)
677	    *p++ &= TRIM;
678}
679
680void
681tglob(t)
682    register Char **t;
683{
684    register Char *p, *c;
685
686    while ((p = *t++) != '\0') {
687	if (*p == '~' || *p == '=')
688	    gflag |= G_CSH;
689	else if (*p == '{' &&
690		 (p[1] == '\0' || (p[1] == '}' && p[2] == '\0')))
691	    continue;
692	/*
693	 * The following line used to be *(c = p++), but hp broke their
694	 * optimizer in 9.01, so we break the assignment into two pieces
695	 * The careful reader here will note that *most* compiler workarounds
696	 * in tcsh are either for apollo/DomainOS or hpux. Is it a coincidence?
697	 */
698	while ( *(c = p) != '\0') {
699	    p++;
700	    if (*c == '`') {
701		gflag |= G_CSH;
702#ifdef notdef
703		/*
704		 * We do want to expand echo `echo '*'`, so we don't\
705		 * use this piece of code anymore.
706		 */
707		while (*p && *p != '`')
708		    if (*p++ == '\\') {
709			if (*p)		/* Quoted chars */
710			    p++;
711			else
712			    break;
713		    }
714		if (*p)			/* The matching ` */
715		    p++;
716		else
717		    break;
718#endif
719	    }
720	    else if (*c == '{')
721		gflag |= G_CSH;
722	    else if (isglob(*c))
723		gflag |= G_GLOB;
724	    else if (symlinks == SYM_EXPAND &&
725		*p && ISDOTDOT(c) && (c == *(t-1) || *(c-1) == '/') )
726	    	gflag |= G_CSH;
727	}
728    }
729}
730
731/*
732 * Command substitute cp.  If literal, then this is a substitution from a
733 * << redirection, and so we should not crunch blanks and tabs, separating
734 * words only at newlines.
735 */
736Char  **
737dobackp(cp, literal)
738    Char   *cp;
739    bool    literal;
740{
741    register Char *lp, *rp;
742    Char   *ep, word[LONGBSIZE];
743
744    if (pargv) {
745#ifdef notdef
746	abort();
747#endif
748	blkfree(pargv);
749    }
750    pargsiz = GLOBSPACE;
751    pargv = (Char **) xmalloc((size_t) (sizeof(Char *) * pargsiz));
752    pargv[0] = NULL;
753    pargcp = pargs = word;
754    pargc = 0;
755    pnleft = LONGBSIZE - 4;
756    for (;;) {
757#if defined(DSPMBYTE)
758	for (lp = cp;; lp++) {
759	    if (*lp == '`' &&
760		(lp-1 < cp || !Ismbyte2(*lp) || !Ismbyte1(*(lp-1)))) {
761		break;
762	    }
763#else /* DSPMBYTE */
764	for (lp = cp; *lp != '`'; lp++) {
765#endif /* DSPMBYTE */
766	    if (*lp == 0) {
767		if (pargcp != pargs)
768		    pword(LONGBSIZE);
769		return (pargv);
770	    }
771	    psave(*lp);
772	}
773	lp++;
774	for (rp = lp; *rp && *rp != '`'; rp++)
775	    if (*rp == '\\') {
776		rp++;
777		if (!*rp)
778		    goto oops;
779	    }
780	if (!*rp)
781    oops:  stderror(ERR_UNMATCHED, '`');
782	ep = Strsave(lp);
783	ep[rp - lp] = 0;
784	backeval(ep, literal);
785	cp = rp + 1;
786    }
787}
788
789
790static void
791backeval(cp, literal)
792    Char   *cp;
793    bool    literal;
794{
795    register int icnt, c;
796    register Char *ip;
797    struct command faket;
798    bool    hadnl;
799    int     pvec[2], quoted;
800    Char   *fakecom[2], ibuf[BUFSIZE];
801    char    tibuf[BUFSIZE];
802
803    hadnl = 0;
804    icnt = 0;
805    quoted = (literal || (cp[0] & QUOTE)) ? QUOTE : 0;
806    faket.t_dtyp = NODE_COMMAND;
807    faket.t_dflg = F_BACKQ;
808    faket.t_dlef = 0;
809    faket.t_drit = 0;
810    faket.t_dspr = 0;
811    faket.t_dcom = fakecom;
812    fakecom[0] = STRfakecom1;
813    fakecom[1] = 0;
814
815    /*
816     * We do the psave job to temporarily change the current job so that the
817     * following fork is considered a separate job.  This is so that when
818     * backquotes are used in a builtin function that calls glob the "current
819     * job" is not corrupted.  We only need one level of pushed jobs as long as
820     * we are sure to fork here.
821     */
822    psavejob();
823
824    /*
825     * It would be nicer if we could integrate this redirection more with the
826     * routines in sh.sem.c by doing a fake execute on a builtin function that
827     * was piped out.
828     */
829    mypipe(pvec);
830    if (pfork(&faket, -1) == 0) {
831	struct command *t;
832
833	(void) close(pvec[0]);
834	(void) dmove(pvec[1], 1);
835	(void) dmove(SHDIAG,  2);
836	initdesc();
837	/*
838	 * Bugfix for nested backquotes by Michael Greim <greim@sbsvax.UUCP>,
839	 * posted to comp.bugs.4bsd 12 Sep. 1989.
840	 */
841	if (pargv)		/* mg, 21.dec.88 */
842	    blkfree(pargv), pargv = 0, pargsiz = 0;
843	/* mg, 21.dec.88 */
844	arginp = cp;
845	while (*cp)
846	    *cp++ &= TRIM;
847
848        /*
849	 * In the child ``forget'' everything about current aliases or
850	 * eval vectors.
851	 */
852	alvec = NULL;
853	evalvec = NULL;
854	alvecp = NULL;
855	evalp = NULL;
856	(void) lex(&paraml);
857	if (seterr)
858	    stderror(ERR_OLD);
859	alias(&paraml);
860	t = syntax(paraml.next, &paraml, 0);
861	if (seterr)
862	    stderror(ERR_OLD);
863	if (t)
864	    t->t_dflg |= F_NOFORK;
865#ifdef SIGTSTP
866	(void) sigignore(SIGTSTP);
867#endif
868#ifdef SIGTTIN
869	(void) sigignore(SIGTTIN);
870#endif
871#ifdef SIGTTOU
872	(void) sigignore(SIGTTOU);
873#endif
874	execute(t, -1, NULL, NULL);
875	exitstat();
876    }
877    xfree((ptr_t) cp);
878    (void) close(pvec[1]);
879    c = 0;
880    ip = NULL;
881    do {
882	int     cnt = 0;
883
884	for (;;) {
885	    if (icnt == 0) {
886		int     i;
887
888		ip = ibuf;
889		do
890		    icnt = read(pvec[0], tibuf, BUFSIZE);
891		while (icnt == -1 && errno == EINTR);
892		if (icnt <= 0) {
893		    c = -1;
894		    break;
895		}
896		for (i = 0; i < icnt; i++)
897		    ip[i] = (unsigned char) tibuf[i];
898	    }
899	    if (hadnl)
900		break;
901	    --icnt;
902	    c = (*ip++ & TRIM);
903	    if (c == 0)
904		break;
905#ifdef WINNT_NATIVE
906	    if (c == '\r')
907	    	c = ' ';
908#endif /* WINNT_NATIVE */
909	    if (c == '\n') {
910		/*
911		 * Continue around the loop one more time, so that we can eat
912		 * the last newline without terminating this word.
913		 */
914		hadnl = 1;
915		continue;
916	    }
917	    if (!quoted && (c == ' ' || c == '\t'))
918		break;
919	    cnt++;
920	    psave(c | quoted);
921	}
922	/*
923	 * Unless at end-of-file, we will form a new word here if there were
924	 * characters in the word, or in any case when we take text literally.
925	 * If we didn't make empty words here when literal was set then we
926	 * would lose blank lines.
927	 */
928	if (c != -1 && (cnt || literal))
929	    pword(BUFSIZE);
930	hadnl = 0;
931    } while (c >= 0);
932    (void) close(pvec[0]);
933    pwait();
934    prestjob();
935}
936
937static void
938psave(c)
939    int    c;
940{
941    if (--pnleft <= 0)
942	stderror(ERR_WTOOLONG);
943    *pargcp++ = (Char) c;
944}
945
946static void
947pword(bufsiz)
948    int    bufsiz;
949{
950    psave(0);
951    if (pargc == pargsiz - 1) {
952	pargsiz += GLOBSPACE;
953	pargv = (Char **) xrealloc((ptr_t) pargv,
954				   (size_t) (pargsiz * sizeof(Char *)));
955    }
956    pargv[pargc++] = Strsave(pargs);
957    pargv[pargc] = NULL;
958    pargcp = pargs;
959    pnleft = bufsiz - 4;
960}
961
962int
963Gmatch(string, pattern)
964    Char *string, *pattern;
965{
966    return Gnmatch(string, pattern, NULL);
967}
968
969int
970Gnmatch(string, pattern, endstr)
971    Char *string, *pattern, **endstr;
972{
973    Char **blk, **p, *tstring = string;
974    int	   gpol = 1, gres = 0;
975
976    if (*pattern == '^') {
977	gpol = 0;
978	pattern++;
979    }
980
981    blk = (Char **) xmalloc((size_t) (GLOBSPACE * sizeof(Char *)));
982    blk[0] = Strsave(pattern);
983    blk[1] = NULL;
984
985    expbrace(&blk, NULL, GLOBSPACE);
986
987    if (endstr == NULL)
988	/* Exact matches only */
989	for (p = blk; *p; p++)
990	    gres |= pmatch(string, *p, &tstring) == 2 ? 1 : 0;
991    else {
992	/* partial matches */
993	int minc = 0x7fffffff;
994	for (p = blk; *p; p++)
995	    if (pmatch(string, *p, &tstring) != 0) {
996		int t = (int) (tstring - string);
997		gres |= 1;
998		if (minc == -1 || minc > t)
999		    minc = t;
1000	    }
1001	*endstr = string + minc;
1002    }
1003
1004    blkfree(blk);
1005    return(gres == gpol);
1006}
1007
1008/* pmatch():
1009 *	Return 2 on exact match,
1010 *	Return 1 on substring match.
1011 *	Return 0 on no match.
1012 *	*estr will point to the end of the longest exact or substring match.
1013 */
1014static int
1015pmatch(string, pattern, estr)
1016    register Char *string, *pattern, **estr;
1017{
1018    register Char stringc, patternc;
1019    int     match, negate_range;
1020    Char    rangec, *oestr, *pestr;
1021
1022    for (;; ++string) {
1023	stringc = *string & TRIM;
1024	/*
1025	 * apollo compiler bug: switch (patternc = *pattern++) dies
1026	 */
1027	patternc = *pattern++;
1028	switch (patternc) {
1029	case 0:
1030	    *estr = string;
1031	    return (stringc == 0 ? 2 : 1);
1032	case '?':
1033	    if (stringc == 0)
1034		return (0);
1035	    *estr = string;
1036	    break;
1037	case '*':
1038	    if (!*pattern) {
1039		while (*string) string++;
1040		*estr = string;
1041		return (2);
1042	    }
1043	    oestr = *estr;
1044	    pestr = NULL;
1045
1046	    do {
1047		switch(pmatch(string, pattern, estr)) {
1048		case 0:
1049		    break;
1050		case 1:
1051		    pestr = *estr;
1052		    break;
1053		case 2:
1054		    return 2;
1055		default:
1056		    abort();	/* Cannot happen */
1057		}
1058		*estr = string;
1059	    }
1060	    while (*string++);
1061
1062	    if (pestr) {
1063		*estr = pestr;
1064		return 1;
1065	    }
1066	    else {
1067		*estr = oestr;
1068		return 0;
1069	    }
1070
1071	case '[':
1072	    match = 0;
1073	    if ((negate_range = (*pattern == '^')) != 0)
1074		pattern++;
1075	    while ((rangec = *pattern++) != '\0') {
1076		if (rangec == ']')
1077		    break;
1078		if (match)
1079		    continue;
1080		if (rangec == '-' && *(pattern-2) != '[' && *pattern  != ']') {
1081		    match = (globcharcoll(stringc, *pattern & TRIM) <= 0 &&
1082		    globcharcoll(*(pattern-2) & TRIM, stringc) <= 0);
1083		    pattern++;
1084		}
1085		else
1086		    match = (stringc == (rangec & TRIM));
1087	    }
1088	    if (rangec == 0)
1089		stderror(ERR_NAME | ERR_MISSING, ']');
1090	    if (match == negate_range)
1091		return (0);
1092	    *estr = string;
1093	    break;
1094	default:
1095	    if ((patternc & TRIM) != stringc)
1096		return (0);
1097	    *estr = string;
1098	    break;
1099	}
1100    }
1101}
1102
1103void
1104Gcat(s1, s2)
1105    Char   *s1, *s2;
1106{
1107    register Char *p, *q;
1108    int     n;
1109
1110    for (p = s1; *p++;)
1111	continue;
1112    for (q = s2; *q++;)
1113	continue;
1114    n = (int) ((p - s1) + (q - s2) - 1);
1115    if (++gargc >= gargsiz) {
1116	gargsiz += GLOBSPACE;
1117	gargv = (Char **) xrealloc((ptr_t) gargv,
1118				   (size_t) (gargsiz * sizeof(Char *)));
1119    }
1120    gargv[gargc] = 0;
1121    p = gargv[gargc - 1] = (Char *) xmalloc((size_t) (n * sizeof(Char)));
1122    for (q = s1; (*p++ = *q++) != '\0';)
1123	continue;
1124    for (p--, q = s2; (*p++ = *q++) != '\0';)
1125	continue;
1126}
1127
1128#ifdef FILEC
1129int
1130sortscmp(a, b)
1131    register Char **a, **b;
1132{
1133    if (!a)			/* check for NULL */
1134	return (b ? 1 : 0);
1135    if (!b)
1136	return (-1);
1137
1138    if (!*a)			/* check for NULL */
1139	return (*b ? 1 : 0);
1140    if (!*b)
1141	return (-1);
1142
1143    return (int) collate(*a, *b);
1144}
1145
1146#endif
1147