704 lines
14 KiB
C
704 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
|
|
#if 0
|
|
static char sccsid[] = "@(#)parse.c 8.1 (Berkeley) 5/31/93";
|
|
#else
|
|
static const char rcsid[] =
|
|
"$Id: parse.c,v 1.5 1997/02/22 14:02:03 peter Exp $";
|
|
#endif
|
|
#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)
|
|
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)
|
|
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;
|
|
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(p1, p2)
|
|
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);
|
|
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)
|
|
struct wordent *p1, *p2;
|
|
{
|
|
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)
|
|
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;
|
|
{
|
|
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 = (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;
|
|
{
|
|
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 = (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;
|
|
{
|
|
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 = (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;
|
|
{
|
|
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 = (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;
|
|
{
|
|
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 = (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;
|
|
{
|
|
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 = (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)
|
|
struct command *t;
|
|
{
|
|
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);
|
|
}
|