Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	bin/csh/parse.c	Lines:	0	285	0.0 %
Date:	2017-11-07	Branches:	0	241	0.0 %


/*	$OpenBSD: parse.c,v 1.12 2015/12/26 13:48:38 mestre Exp $	*/
/*	$NetBSD: parse.c,v 1.6 1995/03/21 09:03:10 cgd Exp $	*/

/*-
 * Copyright (c) 1980, 1991, 1993
 *	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. 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.
 */

#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>

#include "csh.h"
#include "extern.h"

static void	 asyntax(struct wordent *, struct wordent *);
static void	 asyn0(struct wordent *, struct wordent *);
static void	 asyn3(struct wordent *, struct wordent *);
static struct wordent
		*freenod(struct wordent *, struct wordent *);
static struct command
		*syn0(struct wordent *, struct wordent *, int);
static struct command
		*syn1(struct wordent *, struct wordent *, int);
static struct command
		*syn1a(struct wordent *, struct wordent *, int);
static struct command
		*syn1b(struct wordent *, struct wordent *, int);
static struct command
		*syn2(struct wordent *, struct wordent *, int);
static struct command
		*syn3(struct wordent *, struct wordent *, int);

#define ALEFT	21		/* max of 20 alias expansions	 */
#define HLEFT	11		/* max of 10 history expansions	 */
/*
 * Perform aliasing on the word list lex
 * Do a (very rudimentary) parse to separate into commands.
 * If word 0 of a command has an alias, do it.
 * Repeat a maximum of 20 times.
 */
static int aleft;
extern int hleft;
void
alias(struct wordent *lex)
{
    jmp_buf osetexit;

    aleft = ALEFT;
    hleft = HLEFT;
    getexit(osetexit);
    (void) setexit();
    if (haderr) {
	resexit(osetexit);
	reset();
    }
    if (--aleft == 0)
	stderror(ERR_ALIASLOOP);
    asyntax(lex->next, lex);
    resexit(osetexit);
}

static void
asyntax(struct wordent *p1, struct wordent *p2)
{
    while (p1 != p2)
	if (any(";&\n", p1->word[0]))
	    p1 = p1->next;
	else {
	    asyn0(p1, p2);
	    return;
	}
}

static void
asyn0(struct wordent *p1, struct wordent *p2)
{
    struct wordent *p;
    int l = 0;

    for (p = p1; p != p2; p = p->next)
	switch (p->word[0]) {

	case '(':
	    l++;
	    continue;

	case ')':
	    l--;
	    if (l < 0)
		stderror(ERR_TOOMANYRP);
	    continue;

	case '>':
	    if (p->next != p2 && eq(p->next->word, STRand))
		p = p->next;
	    continue;

	case '&':
	case '|':
	case ';':
	case '\n':
	    if (l != 0)
		continue;
	    asyn3(p1, p);
	    asyntax(p->next, p2);
	    return;
	}
    if (l == 0)
	asyn3(p1, p2);
}

static void
asyn3(struct wordent *p1, struct wordent *p2)
{
    struct varent *ap;
    struct wordent alout;
    bool redid;

    if (p1 == p2)
	return;
    if (p1->word[0] == '(') {
	for (p2 = p2->prev; p2->word[0] != ')'; p2 = p2->prev)
	    if (p2 == p1)
		return;
	if (p2 == p1->next)
	    return;
	asyn0(p1->next, p2);
	return;
    }
    ap = adrof1(p1->word, &aliases);
    if (ap == 0)
	return;
    alhistp = p1->prev;
    alhistt = p2;
    alvec = ap->vec;
    redid = lex(&alout);
    alhistp = alhistt = 0;
    alvec = 0;
    if (seterr) {
	freelex(&alout);
	stderror(ERR_OLD);
    }
    if (p1->word[0] && eq(p1->word, alout.next->word)) {
	Char   *cp = alout.next->word;

	alout.next->word = Strspl(STRQNULL, cp);
	free(cp);
    }
    p1 = freenod(p1, redid ? p2 : p1->next);
    if (alout.next != &alout) {
	p1->next->prev = alout.prev->prev;
	alout.prev->prev->next = p1->next;
	alout.next->prev = p1;
	p1->next = alout.next;
	free(alout.prev->word);
	free((alout.prev));
    }
    reset();			/* throw! */
}

static struct wordent *
freenod(struct wordent *p1, struct wordent *p2)
{
    struct wordent *retp = p1->prev;

    while (p1 != p2) {
	free(p1->word);
	p1 = p1->next;
	free((p1->prev));
    }
    retp->next = p2;
    p2->prev = retp;
    return (retp);
}

#define	PHERE	1
#define	PIN	2
#define	POUT	4
#define	PERR	8

/*
 * syntax
 *	empty
 *	syn0
 */
struct command *
syntax(struct wordent *p1, struct wordent *p2, int flags)
{

    while (p1 != p2)
	if (any(";&\n", p1->word[0]))
	    p1 = p1->next;
	else
	    return (syn0(p1, p2, flags));
    return (0);
}

/*
 * syn0
 *	syn1
 *	syn1 & syntax
 */
static struct command *
syn0(struct wordent *p1, struct wordent *p2, int flags)
{
    struct wordent *p;
    struct command *t, *t1;
    int     l;

    l = 0;
    for (p = p1; p != p2; p = p->next)
	switch (p->word[0]) {

	case '(':
	    l++;
	    continue;

	case ')':
	    l--;
	    if (l < 0)
		seterror(ERR_TOOMANYRP);
	    continue;

	case '|':
	    if (p->word[1] == '|')
		continue;
	    /* fall into ... */

	case '>':
	    if (p->next != p2 && eq(p->next->word, STRand))
		p = p->next;
	    continue;

	case '&':
	    if (l != 0)
		break;
	    if (p->word[1] == '&')
		continue;
	    t1 = syn1(p1, p, flags);
	    if (t1->t_dtyp == NODE_LIST ||
		t1->t_dtyp == NODE_AND ||
		t1->t_dtyp == NODE_OR) {
		t = xcalloc(1, sizeof(*t));
		t->t_dtyp = NODE_PAREN;
		t->t_dflg = F_AMPERSAND | F_NOINTERRUPT;
		t->t_dspr = t1;
		t1 = t;
	    }
	    else
		t1->t_dflg |= F_AMPERSAND | F_NOINTERRUPT;
	    t = xcalloc(1, sizeof(*t));
	    t->t_dtyp = NODE_LIST;
	    t->t_dflg = 0;
	    t->t_dcar = t1;
	    t->t_dcdr = syntax(p, p2, flags);
	    return (t);
	}
    if (l == 0)
	return (syn1(p1, p2, flags));
    seterror(ERR_TOOMANYLP);
    return (0);
}

/*
 * syn1
 *	syn1a
 *	syn1a ; syntax
 */
static struct command *
syn1(struct wordent *p1, struct wordent *p2, int flags)
{
    struct wordent *p;
    struct command *t;
    int     l;

    l = 0;
    for (p = p1; p != p2; p = p->next)
	switch (p->word[0]) {

	case '(':
	    l++;
	    continue;

	case ')':
	    l--;
	    continue;

	case ';':
	case '\n':
	    if (l != 0)
		break;
	    t = xcalloc(1, sizeof(*t));
	    t->t_dtyp = NODE_LIST;
	    t->t_dcar = syn1a(p1, p, flags);
	    t->t_dcdr = syntax(p->next, p2, flags);
	    if (t->t_dcdr == 0)
		t->t_dcdr = t->t_dcar, t->t_dcar = 0;
	    return (t);
	}
    return (syn1a(p1, p2, flags));
}

/*
 * syn1a
 *	syn1b
 *	syn1b || syn1a
 */
static struct command *
syn1a(struct wordent *p1, struct wordent *p2, int flags)
{
    struct wordent *p;
    struct command *t;
    int l = 0;

    for (p = p1; p != p2; p = p->next)
	switch (p->word[0]) {

	case '(':
	    l++;
	    continue;

	case ')':
	    l--;
	    continue;

	case '|':
	    if (p->word[1] != '|')
		continue;
	    if (l == 0) {
		t = xcalloc(1, sizeof(*t));
		t->t_dtyp = NODE_OR;
		t->t_dcar = syn1b(p1, p, flags);
		t->t_dcdr = syn1a(p->next, p2, flags);
		t->t_dflg = 0;
		return (t);
	    }
	    continue;
	}
    return (syn1b(p1, p2, flags));
}

/*
 * syn1b
 *	syn2
 *	syn2 && syn1b
 */
static struct command *
syn1b(struct wordent *p1, struct wordent *p2, int flags)
{
    struct wordent *p;
    struct command *t;
    int l = 0;

    for (p = p1; p != p2; p = p->next)
	switch (p->word[0]) {

	case '(':
	    l++;
	    continue;

	case ')':
	    l--;
	    continue;

	case '&':
	    if (p->word[1] == '&' && l == 0) {
		t = xcalloc(1, sizeof(*t));
		t->t_dtyp = NODE_AND;
		t->t_dcar = syn2(p1, p, flags);
		t->t_dcdr = syn1b(p->next, p2, flags);
		t->t_dflg = 0;
		return (t);
	    }
	    continue;
	}
    return (syn2(p1, p2, flags));
}

/*
 * syn2
 *	syn3
 *	syn3 | syn2
 *	syn3 |& syn2
 */
static struct command *
syn2(struct wordent *p1, struct wordent *p2, int flags)
{
    struct wordent *p, *pn;
    struct command *t;
    int l = 0;
    int     f;

    for (p = p1; p != p2; p = p->next)
	switch (p->word[0]) {

	case '(':
	    l++;
	    continue;

	case ')':
	    l--;
	    continue;

	case '|':
	    if (l != 0)
		continue;
	    t = xcalloc(1, sizeof(*t));
	    f = flags | POUT;
	    pn = p->next;
	    if (pn != p2 && pn->word[0] == '&') {
		f |= PERR;
		t->t_dflg |= F_STDERR;
	    }
	    t->t_dtyp = NODE_PIPE;
	    t->t_dcar = syn3(p1, p, f);
	    if (pn != p2 && pn->word[0] == '&')
		p = pn;
	    t->t_dcdr = syn2(p->next, p2, flags | PIN);
	    return (t);
	}
    return (syn3(p1, p2, flags));
}

static char RELPAR[] = {'<', '>', '(', ')', '\0'};

/*
 * syn3
 *	( syn0 ) [ < in  ] [ > out ]
 *	word word* [ < in ] [ > out ]
 *	KEYWORD ( word* ) word* [ < in ] [ > out ]
 *
 *	KEYWORD = (@ exit foreach if set switch test while)
 */
static struct command *
syn3(struct wordent *p1, struct wordent *p2, int flags)
{
    struct wordent *p;
    struct wordent *lp, *rp;
    struct command *t;
    int l;
    Char  **av;
    int     n, c;
    bool    specp = 0;

    if (p1 != p2) {
	p = p1;
again:
	switch (srchx(p->word)) {

	case T_ELSE:
	    p = p->next;
	    if (p != p2)
		goto again;
	    break;

	case T_EXIT:
	case T_FOREACH:
	case T_IF:
	case T_LET:
	case T_SET:
	case T_SWITCH:
	case T_WHILE:
	    specp = 1;
	    break;
	}
    }
    n = 0;
    l = 0;
    for (p = p1; p != p2; p = p->next)
	switch (p->word[0]) {

	case '(':
	    if (specp)
		n++;
	    l++;
	    continue;

	case ')':
	    if (specp)
		n++;
	    l--;
	    continue;

	case '>':
	case '<':
	    if (l != 0) {
		if (specp)
		    n++;
		continue;
	    }
	    if (p->next == p2)
		continue;
	    if (any(RELPAR, p->next->word[0]))
		continue;
	    n--;
	    continue;

	default:
	    if (!specp && l != 0)
		continue;
	    n++;
	    continue;
	}
    if (n < 0)
	n = 0;
    t = xcalloc(1, sizeof(*t));
    av = xcalloc((size_t) (n + 1), sizeof(Char **));
    t->t_dcom = av;
    n = 0;
    if (p2->word[0] == ')')
	t->t_dflg = F_NOFORK;
    lp = 0;
    rp = 0;
    l = 0;
    for (p = p1; p != p2; p = p->next) {
	c = p->word[0];
	switch (c) {

	case '(':
	    if (l == 0) {
		if (lp != 0 && !specp)
		    seterror(ERR_BADPLP);
		lp = p->next;
	    }
	    l++;
	    goto savep;

	case ')':
	    l--;
	    if (l == 0)
		rp = p;
	    goto savep;

	case '>':
	    if (l != 0)
		goto savep;
	    if (p->word[1] == '>')
		t->t_dflg |= F_APPEND;
	    if (p->next != p2 && eq(p->next->word, STRand)) {
		t->t_dflg |= F_STDERR, p = p->next;
		if (flags & (POUT | PERR)) {
		    seterror(ERR_OUTRED);
		    continue;
		}
	    }
	    if (p->next != p2 && eq(p->next->word, STRbang))
		t->t_dflg |= F_OVERWRITE, p = p->next;
	    if (p->next == p2) {
		seterror(ERR_MISRED);
		continue;
	    }
	    p = p->next;
	    if (any(RELPAR, p->word[0])) {
		seterror(ERR_MISRED);
		continue;
	    }
	    if ((flags & POUT) && ((flags & PERR) == 0 || t->t_drit))
		seterror(ERR_OUTRED);
	    else
		t->t_drit = Strsave(p->word);
	    continue;

	case '<':
	    if (l != 0)
		goto savep;
	    if (p->word[1] == '<')
		t->t_dflg |= F_READ;
	    if (p->next == p2) {
		seterror(ERR_MISRED);
		continue;
	    }
	    p = p->next;
	    if (any(RELPAR, p->word[0])) {
		seterror(ERR_MISRED);
		continue;
	    }
	    if ((flags & PHERE) && (t->t_dflg & F_READ))
		seterror(ERR_REDPAR);
	    else if ((flags & PIN) || t->t_dlef)
		seterror(ERR_INRED);
	    else
		t->t_dlef = Strsave(p->word);
	    continue;

    savep:
	    if (!specp)
		continue;
	default:
	    if (l != 0 && !specp)
		continue;
	    if (seterr == 0)
		av[n] = Strsave(p->word);
	    n++;
	    continue;
	}
    }
    if (lp != 0 && !specp) {
	if (n != 0)
	    seterror(ERR_BADPLPS);
	t->t_dtyp = NODE_PAREN;
	t->t_dspr = syn0(lp, rp, PHERE);
    }
    else {
	if (n == 0)
	    seterror(ERR_NULLCOM);
	t->t_dtyp = NODE_COMMAND;
    }
    return (t);
}

void
freesyn(struct command *t)
{
    Char **v;

    if (t == 0)
	return;
    switch (t->t_dtyp) {

    case NODE_COMMAND:
	for (v = t->t_dcom; *v; v++)
	    free(* v);
	free((t->t_dcom));
	free(t->t_dlef);
	free(t->t_drit);
	break;
    case NODE_PAREN:
	freesyn(t->t_dspr);
	free(t->t_dlef);
	free(t->t_drit);
	break;

    case NODE_AND:
    case NODE_OR:
    case NODE_PIPE:
    case NODE_LIST:
	freesyn(t->t_dcar), freesyn(t->t_dcdr);
	break;
    }
    free(t);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: parse.c,v 1.12 2015/12/26 13:48:38 mestre Exp $ */
2			/* $NetBSD: parse.c,v 1.6 1995/03/21 09:03:10 cgd Exp $ */
3
4			/*-
5			* Copyright (c) 1980, 1991, 1993
6			* The Regents of the University of California. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
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. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32
33			#include <sys/types.h>
34			#include <stdlib.h>
35			#include <string.h>
36			#include <stdarg.h>
37
38			#include "csh.h"
39			#include "extern.h"
40
41			static void asyntax(struct wordent , struct wordent );
42			static void asyn0(struct wordent , struct wordent );
43			static void asyn3(struct wordent , struct wordent );
44			static struct wordent
45			freenod(struct wordent , struct wordent *);
46			static struct command
47			syn0(struct wordent , struct wordent *, int);
48			static struct command
49			syn1(struct wordent , struct wordent *, int);
50			static struct command
51			syn1a(struct wordent , struct wordent *, int);
52			static struct command
53			syn1b(struct wordent , struct wordent *, int);
54			static struct command
55			syn2(struct wordent , struct wordent *, int);
56			static struct command
57			syn3(struct wordent , struct wordent *, int);
58
59			#define ALEFT 21 /* max of 20 alias expansions */
60			#define HLEFT 11 /* max of 10 history expansions */
61			/*
62			* Perform aliasing on the word list lex
63			* Do a (very rudimentary) parse to separate into commands.
64			* If word 0 of a command has an alias, do it.
65			* Repeat a maximum of 20 times.
66			*/
67			static int aleft;
68			extern int hleft;
69			void
70			alias(struct wordent *lex)
71			{
72			jmp_buf osetexit;
73
74			aleft = ALEFT;
75			hleft = HLEFT;
76			getexit(osetexit);
77			(void) setexit();
78			if (haderr) {
79			resexit(osetexit);
80			reset();
81			}
82			if (--aleft == 0)
83			stderror(ERR_ALIASLOOP);
84			asyntax(lex->next, lex);
85			resexit(osetexit);
86			}
87
88			static void
89			asyntax(struct wordent p1, struct wordent p2)
90			{
91			while (p1 != p2)
92			if (any(";&\n", p1->word[0]))
93			p1 = p1->next;
94			else {
95			asyn0(p1, p2);
96			return;
97			}
98			}
99
100			static void
101			asyn0(struct wordent p1, struct wordent p2)
102			{
103			struct wordent *p;
104			int l = 0;
105
106			for (p = p1; p != p2; p = p->next)
107			switch (p->word[0]) {
108
109			case '(':
110			l++;
111			continue;
112
113			case ')':
114			l--;
115			if (l < 0)
116			stderror(ERR_TOOMANYRP);
117			continue;
118
119			case '>':
120			if (p->next != p2 && eq(p->next->word, STRand))
121			p = p->next;
122			continue;
123
124			case '&':
125			case '\|':
126			case ';':
127			case '\n':
128			if (l != 0)
129			continue;
130			asyn3(p1, p);
131			asyntax(p->next, p2);
132			return;
133			}
134			if (l == 0)
135			asyn3(p1, p2);
136			}
137
138			static void
139			asyn3(struct wordent p1, struct wordent p2)
140			{
141			struct varent *ap;
142			struct wordent alout;
143			bool redid;
144
145			if (p1 == p2)
146			return;
147			if (p1->word[0] == '(') {
148			for (p2 = p2->prev; p2->word[0] != ')'; p2 = p2->prev)
149			if (p2 == p1)
150			return;
151			if (p2 == p1->next)
152			return;
153			asyn0(p1->next, p2);
154			return;
155			}
156			ap = adrof1(p1->word, &aliases);
157			if (ap == 0)
158			return;
159			alhistp = p1->prev;
160			alhistt = p2;
161			alvec = ap->vec;
162			redid = lex(&alout);
163			alhistp = alhistt = 0;
164			alvec = 0;
165			if (seterr) {
166			freelex(&alout);
167			stderror(ERR_OLD);
168			}
169			if (p1->word[0] && eq(p1->word, alout.next->word)) {
170			Char *cp = alout.next->word;
171
172			alout.next->word = Strspl(STRQNULL, cp);
173			free(cp);
174			}
175			p1 = freenod(p1, redid ? p2 : p1->next);
176			if (alout.next != &alout) {
177			p1->next->prev = alout.prev->prev;
178			alout.prev->prev->next = p1->next;
179			alout.next->prev = p1;
180			p1->next = alout.next;
181			free(alout.prev->word);
182			free((alout.prev));
183			}
184			reset(); /* throw! */
185			}
186
187			static struct wordent *
188			freenod(struct wordent p1, struct wordent p2)
189			{
190			struct wordent *retp = p1->prev;
191
192			while (p1 != p2) {
193			free(p1->word);
194			p1 = p1->next;
195			free((p1->prev));
196			}
197			retp->next = p2;
198			p2->prev = retp;
199			return (retp);
200			}
201
202			#define PHERE 1
203			#define PIN 2
204			#define POUT 4
205			#define PERR 8
206
207			/*
208			* syntax
209			* empty
210			* syn0
211			*/
212			struct command *
213			syntax(struct wordent p1, struct wordent p2, int flags)
214			{
215
216			while (p1 != p2)
217			if (any(";&\n", p1->word[0]))
218			p1 = p1->next;
219			else
220			return (syn0(p1, p2, flags));
221			return (0);
222			}
223
224			/*
225			* syn0
226			* syn1
227			* syn1 & syntax
228			*/
229			static struct command *
230			syn0(struct wordent p1, struct wordent p2, int flags)
231			{
232			struct wordent *p;
233			struct command t, t1;
234			int l;
235
236			l = 0;
237			for (p = p1; p != p2; p = p->next)
238			switch (p->word[0]) {
239
240			case '(':
241			l++;
242			continue;
243
244			case ')':
245			l--;
246			if (l < 0)
247			seterror(ERR_TOOMANYRP);
248			continue;
249
250			case '\|':
251			if (p->word[1] == '\|')
252			continue;
253			/* fall into ... */
254
255			case '>':
256			if (p->next != p2 && eq(p->next->word, STRand))
257			p = p->next;
258			continue;
259
260			case '&':
261			if (l != 0)
262			break;
263			if (p->word[1] == '&')
264			continue;
265			t1 = syn1(p1, p, flags);
266			if (t1->t_dtyp == NODE_LIST \|\|
267			t1->t_dtyp == NODE_AND \|\|
268			t1->t_dtyp == NODE_OR) {
269			t = xcalloc(1, sizeof(*t));
270			t->t_dtyp = NODE_PAREN;
271			t->t_dflg = F_AMPERSAND \| F_NOINTERRUPT;
272			t->t_dspr = t1;
273			t1 = t;
274			}
275			else
276			t1->t_dflg \|= F_AMPERSAND \| F_NOINTERRUPT;
277			t = xcalloc(1, sizeof(*t));
278			t->t_dtyp = NODE_LIST;
279			t->t_dflg = 0;
280			t->t_dcar = t1;
281			t->t_dcdr = syntax(p, p2, flags);
282			return (t);
283			}
284			if (l == 0)
285			return (syn1(p1, p2, flags));
286			seterror(ERR_TOOMANYLP);
287			return (0);
288			}
289
290			/*
291			* syn1
292			* syn1a
293			* syn1a ; syntax
294			*/
295			static struct command *
296			syn1(struct wordent p1, struct wordent p2, int flags)
297			{
298			struct wordent *p;
299			struct command *t;
300			int l;
301
302			l = 0;
303			for (p = p1; p != p2; p = p->next)
304			switch (p->word[0]) {
305
306			case '(':
307			l++;
308			continue;
309
310			case ')':
311			l--;
312			continue;
313
314			case ';':
315			case '\n':
316			if (l != 0)
317			break;
318			t = xcalloc(1, sizeof(*t));
319			t->t_dtyp = NODE_LIST;
320			t->t_dcar = syn1a(p1, p, flags);
321			t->t_dcdr = syntax(p->next, p2, flags);
322			if (t->t_dcdr == 0)
323			t->t_dcdr = t->t_dcar, t->t_dcar = 0;
324			return (t);
325			}
326			return (syn1a(p1, p2, flags));
327			}
328
329			/*
330			* syn1a
331			* syn1b
332			* syn1b \|\| syn1a
333			*/
334			static struct command *
335			syn1a(struct wordent p1, struct wordent p2, int flags)
336			{
337			struct wordent *p;
338			struct command *t;
339			int l = 0;
340
341			for (p = p1; p != p2; p = p->next)
342			switch (p->word[0]) {
343
344			case '(':
345			l++;
346			continue;
347
348			case ')':
349			l--;
350			continue;
351
352			case '\|':
353			if (p->word[1] != '\|')
354			continue;
355			if (l == 0) {
356			t = xcalloc(1, sizeof(*t));
357			t->t_dtyp = NODE_OR;
358			t->t_dcar = syn1b(p1, p, flags);
359			t->t_dcdr = syn1a(p->next, p2, flags);
360			t->t_dflg = 0;
361			return (t);
362			}
363			continue;
364			}
365			return (syn1b(p1, p2, flags));
366			}
367
368			/*
369			* syn1b
370			* syn2
371			* syn2 && syn1b
372			*/
373			static struct command *
374			syn1b(struct wordent p1, struct wordent p2, int flags)
375			{
376			struct wordent *p;
377			struct command *t;
378			int l = 0;
379
380			for (p = p1; p != p2; p = p->next)
381			switch (p->word[0]) {
382
383			case '(':
384			l++;
385			continue;
386
387			case ')':
388			l--;
389			continue;
390
391			case '&':
392			if (p->word[1] == '&' && l == 0) {
393			t = xcalloc(1, sizeof(*t));
394			t->t_dtyp = NODE_AND;
395			t->t_dcar = syn2(p1, p, flags);
396			t->t_dcdr = syn1b(p->next, p2, flags);
397			t->t_dflg = 0;
398			return (t);
399			}
400			continue;
401			}
402			return (syn2(p1, p2, flags));
403			}
404
405			/*
406			* syn2
407			* syn3
408			* syn3 \| syn2
409			* syn3 \|& syn2
410			*/
411			static struct command *
412			syn2(struct wordent p1, struct wordent p2, int flags)
413			{
414			struct wordent p, pn;
415			struct command *t;
416			int l = 0;
417			int f;
418
419			for (p = p1; p != p2; p = p->next)
420			switch (p->word[0]) {
421
422			case '(':
423			l++;
424			continue;
425
426			case ')':
427			l--;
428			continue;
429
430			case '\|':
431			if (l != 0)
432			continue;
433			t = xcalloc(1, sizeof(*t));
434			f = flags \| POUT;
435			pn = p->next;
436			if (pn != p2 && pn->word[0] == '&') {
437			f \|= PERR;
438			t->t_dflg \|= F_STDERR;
439			}
440			t->t_dtyp = NODE_PIPE;
441			t->t_dcar = syn3(p1, p, f);
442			if (pn != p2 && pn->word[0] == '&')
443			p = pn;
444			t->t_dcdr = syn2(p->next, p2, flags \| PIN);
445			return (t);
446			}
447			return (syn3(p1, p2, flags));
448			}
449
450			static char RELPAR[] = {'<', '>', '(', ')', '\0'};
451
452			/*
453			* syn3
454			* ( syn0 ) [ < in ] [ > out ]
455			* word word* [ < in ] [ > out ]
456			* KEYWORD ( word* ) word* [ < in ] [ > out ]
457			*
458			* KEYWORD = (@ exit foreach if set switch test while)
459			*/
460			static struct command *
461			syn3(struct wordent p1, struct wordent p2, int flags)
462			{
463			struct wordent *p;
464			struct wordent lp, rp;
465			struct command *t;
466			int l;
467			Char **av;
468			int n, c;
469			bool specp = 0;
470
471			if (p1 != p2) {
472			p = p1;
473			again:
474			switch (srchx(p->word)) {
475
476			case T_ELSE:
477			p = p->next;
478			if (p != p2)
479			goto again;
480			break;
481
482			case T_EXIT:
483			case T_FOREACH:
484			case T_IF:
485			case T_LET:
486			case T_SET:
487			case T_SWITCH:
488			case T_WHILE:
489			specp = 1;
490			break;
491			}
492			}
493			n = 0;
494			l = 0;
495			for (p = p1; p != p2; p = p->next)
496			switch (p->word[0]) {
497
498			case '(':
499			if (specp)
500			n++;
501			l++;
502			continue;
503
504			case ')':
505			if (specp)
506			n++;
507			l--;
508			continue;
509
510			case '>':
511			case '<':
512			if (l != 0) {
513			if (specp)
514			n++;
515			continue;
516			}
517			if (p->next == p2)
518			continue;
519			if (any(RELPAR, p->next->word[0]))
520			continue;
521			n--;
522			continue;
523
524			default:
525			if (!specp && l != 0)
526			continue;
527			n++;
528			continue;
529			}
530			if (n < 0)
531			n = 0;
532			t = xcalloc(1, sizeof(*t));
533			av = xcalloc((size_t) (n + 1), sizeof(Char **));
534			t->t_dcom = av;
535			n = 0;
536			if (p2->word[0] == ')')
537			t->t_dflg = F_NOFORK;
538			lp = 0;
539			rp = 0;
540			l = 0;
541			for (p = p1; p != p2; p = p->next) {
542			c = p->word[0];
543			switch (c) {
544
545			case '(':
546			if (l == 0) {
547			if (lp != 0 && !specp)
548			seterror(ERR_BADPLP);
549			lp = p->next;
550			}
551			l++;
552			goto savep;
553
554			case ')':
555			l--;
556			if (l == 0)
557			rp = p;
558			goto savep;
559
560			case '>':
561			if (l != 0)
562			goto savep;
563			if (p->word[1] == '>')
564			t->t_dflg \|= F_APPEND;
565			if (p->next != p2 && eq(p->next->word, STRand)) {
566			t->t_dflg \|= F_STDERR, p = p->next;
567			if (flags & (POUT \| PERR)) {
568			seterror(ERR_OUTRED);
569			continue;
570			}
571			}
572			if (p->next != p2 && eq(p->next->word, STRbang))
573			t->t_dflg \|= F_OVERWRITE, p = p->next;
574			if (p->next == p2) {
575			seterror(ERR_MISRED);
576			continue;
577			}
578			p = p->next;
579			if (any(RELPAR, p->word[0])) {
580			seterror(ERR_MISRED);
581			continue;
582			}
583			if ((flags & POUT) && ((flags & PERR) == 0 \|\| t->t_drit))
584			seterror(ERR_OUTRED);
585			else
586			t->t_drit = Strsave(p->word);
587			continue;
588
589			case '<':
590			if (l != 0)
591			goto savep;
592			if (p->word[1] == '<')
593			t->t_dflg \|= F_READ;
594			if (p->next == p2) {
595			seterror(ERR_MISRED);
596			continue;
597			}
598			p = p->next;
599			if (any(RELPAR, p->word[0])) {
600			seterror(ERR_MISRED);
601			continue;
602			}
603			if ((flags & PHERE) && (t->t_dflg & F_READ))
604			seterror(ERR_REDPAR);
605			else if ((flags & PIN) \|\| t->t_dlef)
606			seterror(ERR_INRED);
607			else
608			t->t_dlef = Strsave(p->word);
609			continue;
610
611			savep:
612			if (!specp)
613			continue;
614			default:
615			if (l != 0 && !specp)
616			continue;
617			if (seterr == 0)
618			av[n] = Strsave(p->word);
619			n++;
620			continue;
621			}
622			}
623			if (lp != 0 && !specp) {
624			if (n != 0)
625			seterror(ERR_BADPLPS);
626			t->t_dtyp = NODE_PAREN;
627			t->t_dspr = syn0(lp, rp, PHERE);
628			}
629			else {
630			if (n == 0)
631			seterror(ERR_NULLCOM);
632			t->t_dtyp = NODE_COMMAND;
633			}
634			return (t);
635			}
636
637			void
638			freesyn(struct command *t)
639			{
640			Char **v;
641
642			if (t == 0)
643			return;
644			switch (t->t_dtyp) {
645
646			case NODE_COMMAND:
647			for (v = t->t_dcom; *v; v++)
648			free(* v);
649			free((t->t_dcom));
650			free(t->t_dlef);
651			free(t->t_drit);
652			break;
653			case NODE_PAREN:
654			freesyn(t->t_dspr);
655			free(t->t_dlef);
656			free(t->t_drit);
657			break;
658
659			case NODE_AND:
660			case NODE_OR:
661			case NODE_PIPE:
662			case NODE_LIST:
663			freesyn(t->t_dcar), freesyn(t->t_dcdr);
664			break;
665			}
666			free(t);
667			}