freebsd-dev/bin/csh/parse.c
1994-05-26 06:18:55 +00:00

699 lines
14 KiB
C

/*-
* 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. 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
static char sccsid[] = "@(#)parse.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#include "csh.h"
#include "extern.h"
static void asyntax __P((struct wordent *, struct wordent *));
static void asyn0 __P((struct wordent *, struct wordent *));
static void asyn3 __P((struct wordent *, struct wordent *));
static struct wordent
*freenod __P((struct wordent *, struct wordent *));
static struct command
*syn0 __P((struct wordent *, struct wordent *, int));
static struct command
*syn1 __P((struct wordent *, struct wordent *, int));
static struct command
*syn1a __P((struct wordent *, struct wordent *, int));
static struct command
*syn1b __P((struct wordent *, struct wordent *, int));
static struct command
*syn2 __P((struct wordent *, struct wordent *, int));
static struct command
*syn3 __P((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(lex)
register 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(p1, p2)
register struct wordent *p1, *p2;
{
while (p1 != p2)
if (any(";&\n", p1->word[0]))
p1 = p1->next;
else {
asyn0(p1, p2);
return;
}
}
static void
asyn0(p1, p2)
struct wordent *p1;
register struct wordent *p2;
{
register struct wordent *p;
register 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(p1, p2)
struct wordent *p1;
register struct wordent *p2;
{
register struct varent *ap;
struct wordent alout;
register 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);
xfree((ptr_t) 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;
xfree((ptr_t) alout.prev->word);
xfree((ptr_t) (alout.prev));
}
reset(); /* throw! */
}
static struct wordent *
freenod(p1, p2)
register struct wordent *p1, *p2;
{
register struct wordent *retp = p1->prev;
while (p1 != p2) {
xfree((ptr_t) p1->word);
p1 = p1->next;
xfree((ptr_t) (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(p1, p2, flags)
register struct wordent *p1, *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(p1, p2, flags)
struct wordent *p1, *p2;
int flags;
{
register struct wordent *p;
register 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 = (struct command *) 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 = (struct command *) 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(p1, p2, flags)
struct wordent *p1, *p2;
int flags;
{
register struct wordent *p;
register 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 = (struct command *) 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(p1, p2, flags)
struct wordent *p1, *p2;
int flags;
{
register struct wordent *p;
register struct command *t;
register 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 = (struct command *) 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(p1, p2, flags)
struct wordent *p1, *p2;
int flags;
{
register struct wordent *p;
register struct command *t;
register 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 = (struct command *) 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(p1, p2, flags)
struct wordent *p1, *p2;
int flags;
{
register struct wordent *p, *pn;
register struct command *t;
register 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 = (struct command *) 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(p1, p2, flags)
struct wordent *p1, *p2;
int flags;
{
register struct wordent *p;
struct wordent *lp, *rp;
register struct command *t;
register 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 = (struct command *) xcalloc(1, sizeof(*t));
av = (Char **) 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(t)
register struct command *t;
{
register Char **v;
if (t == 0)
return;
switch (t->t_dtyp) {
case NODE_COMMAND:
for (v = t->t_dcom; *v; v++)
xfree((ptr_t) * v);
xfree((ptr_t) (t->t_dcom));
xfree((ptr_t) t->t_dlef);
xfree((ptr_t) t->t_drit);
break;
case NODE_PAREN:
freesyn(t->t_dspr);
xfree((ptr_t) t->t_dlef);
xfree((ptr_t) 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;
}
xfree((ptr_t) t);
}