Пример #1
0
STATIC void
parsefname() {
      union node *n = redirnode;

      if (readtoken() != TWORD)
            synexpect(-1);
      if (n->type == NHERE) {
            struct heredoc *here = heredoc;
            struct heredoc *p;
            int i;

            if (quoteflag == 0)
                  n->type = NXHERE;
            TRACE(("Here document %d\n", n->type));
            if (here->striptabs) {
                  while (*wordtext == '\t')
                        wordtext++;
            }
            if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
                  synerror("Illegal eof marker for << redirection");
            rmescapes(wordtext);
            here->eofmark = wordtext;
            here->next = NULL;
            if (heredoclist == NULL)
                  heredoclist = here;
            else {
                  for (p = heredoclist ; p->next ; p = p->next);
                  p->next = here;
            }
      } else if (n->type == NTOFD || n->type == NFROMFD) {
            if (is_digit(wordtext[0]))
                  n->ndup.dupfd = digit_val(wordtext[0]);
            else if (wordtext[0] == '-')
                  n->ndup.dupfd = -1;
            else
                  goto bad;
            if (wordtext[1] != '\0') {
bad:
                  synerror("Bad fd number");
            }
      } else {
            n->nfile.fname = (union node *)stalloc(sizeof (struct narg));
            n = n->nfile.fname;
            n->type = NARG;
            n->narg.next = NULL;
            n->narg.text = wordtext;
            n->narg.backquote = backquotelist;
      }
}
Пример #2
0
STATIC void
synexpect(int token)
{
	char msg[64];

	if (token >= 0) {
		fmtstr(msg, 64, "%s unexpected (expecting %s)",
			tokname[lasttoken], tokname[token]);
	} else {
		fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
	}
	synerror(msg);
}
Пример #3
0
STATIC union node *
simplecmd() {
      union node *args, **app;
      union node *redir, **rpp;
      union node *n;

      args = NULL;
      app = &args;
      rpp = &redir;
      for (;;) {
            if (readtoken() == TWORD) {
                  n = (union node *)stalloc(sizeof (struct narg));
                  n->type = NARG;
                  n->narg.text = wordtext;
                  n->narg.backquote = backquotelist;
                  *app = n;
                  app = &n->narg.next;
            } else if (lasttoken == TREDIR) {
                  *rpp = n = redirnode;
                  rpp = &n->nfile.next;
                  parsefname();        /* read name of redirection file */
            } else if (lasttoken == TLP && app == &args->narg.next
                                 && rpp == &redir) {
                  /* We have a function */
                  if (readtoken() != TRP)
                        synexpect(TRP);
                  if (! goodname(n->narg.text))
                        synerror("Bad function name");
                  n->type = NDEFUN;
                  n->narg.next = command();
                  return n;
            } else {
                  tokpushback++;
                  break;
            }
      }
      *app = NULL;
      *rpp = NULL;
      n = (union node *)stalloc(sizeof (struct ncmd));
      n->type = NCMD;
      n->ncmd.backgnd = 0;
      n->ncmd.args = args;
      n->ncmd.redirect = redir;
      return n;
}
Пример #4
0
void fixredir(union node *n, const char *text, int err)
{
	TRACE(("Fix redir %s %d\n", text, err));
	if (!err)
		n->ndup.vname = NULL;

	if (is_digit(text[0]) && text[1] == '\0')
		n->ndup.dupfd = digit_val(text[0]);
	else if (text[0] == '-' && text[1] == '\0')
		n->ndup.dupfd = -1;
	else {

		if (err)
			synerror("Bad fd number");
		else
			n->ndup.vname = makename();
	}
}
Пример #5
0
STATIC void
parsefname(void)
{
	union node *n = redirnode;

	if (readtoken() != TWORD)
		synexpect(-1);
	if (n->type == NHERE) {
		struct heredoc *here = heredoc;
		struct heredoc *p;
		int i;

		if (quoteflag == 0)
			n->type = NXHERE;
		TRACE(("Here document %d\n", n->type));
		if (here->striptabs) {
			while (*wordtext == '\t')
				wordtext++;
		}
		if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
			synerror("Illegal eof marker for << redirection");
		rmescapes(wordtext);
		here->eofmark = wordtext;
		here->next = NULL;
		if (heredoclist == NULL)
			heredoclist = here;
		else {
			for (p = heredoclist ; p->next ; p = p->next);
			p->next = here;
		}
	} else if (n->type == NTOFD || n->type == NFROMFD) {
		fixredir(n, wordtext, 0);
	} else {
		n->nfile.fname = makename();
	}
}
Пример #6
0
STATIC int
readtoken1(int firstc, char const *syntax, char *eofmark, int striptabs)
{
	int c = firstc;
	char *out;
	int len;
	char line[EOFMARKLEN + 1];
	struct nodelist *bqlist;
	int quotef;
	int dblquote;
	int varnest;	/* levels of variables expansion */
	int arinest;	/* levels of arithmetic expansion */
	int parenlevel;	/* levels of parens in arithmetic */
	int oldstyle;
	char const *prevsyntax;	/* syntax before arithmetic */
	int synentry;
#if __GNUC__
	/* Avoid longjmp clobbering */
	(void) &out;
	(void) &quotef;
	(void) &dblquote;
	(void) &varnest;
	(void) &arinest;
	(void) &parenlevel;
	(void) &oldstyle;
	(void) &prevsyntax;
	(void) &syntax;
	(void) &synentry;
#endif

	startlinno = plinno;
	dblquote = 0;
	if (syntax == DQSYNTAX)
		dblquote = 1;
	quotef = 0;
	bqlist = NULL;
	varnest = 0;
	arinest = 0;
	parenlevel = 0;

	STARTSTACKSTR(out);
	loop: {	/* for each line, until end of word */
		CHECKEND();	/* set c to PEOF if at end of here document */
		for (;;) {	/* until end of line or end of word */
			CHECKSTRSPACE(3, out);	/* permit 3 calls to USTPUTC */

			synentry = syntax[c];

			switch(synentry) {
			case CNL:	/* '\n' */
				if (syntax == BASESYNTAX)
					goto endword;	/* exit outer loop */
				USTPUTC(c, out);
				plinno++;
				if (doprompt)
					setprompt(2);
				else
					setprompt(0);
				c = pgetc();
				goto loop;		/* continue outer loop */
			case CWORD:
				USTPUTC(c, out);
				break;
			case CCTL:
				if (eofmark == NULL || dblquote)
					USTPUTC(CTLESC, out);
				USTPUTC(c, out);
				break;
			case CBACK:	/* backslash */
				c = pgetc();
				if (c == PEOF) {
					USTPUTC('\\', out);
					pungetc();
				} else if (c == '\n') {
					if (doprompt)
						setprompt(2);
					else
						setprompt(0);
				} else {
					if (dblquote && c != '\\' &&
					    c != '`' && c != '$' &&
					    (c != '"' || eofmark != NULL))
						USTPUTC('\\', out);
					if (SQSYNTAX[c] == CCTL)
						USTPUTC(CTLESC, out);
					else if (eofmark == NULL)
						USTPUTC(CTLQUOTEMARK, out);
					USTPUTC(c, out);
					quotef++;
				}
				break;
			case CSQUOTE:
				if (eofmark == NULL)
					USTPUTC(CTLQUOTEMARK, out);
				syntax = SQSYNTAX;
				break;
			case CDQUOTE:
				if (eofmark == NULL)
					USTPUTC(CTLQUOTEMARK, out);
				syntax = DQSYNTAX;
				dblquote = 1;
				break;
			case CENDQUOTE:
				if (eofmark != NULL && arinest == 0 &&
				    varnest == 0) {
					USTPUTC(c, out);
				} else {
					if (arinest) {
						syntax = ARISYNTAX;
						dblquote = 0;
					} else if (eofmark == NULL) {
						syntax = BASESYNTAX;
						dblquote = 0;
					}
					quotef++;
				}
				break;
			case CVAR:	/* '$' */
				PARSESUB();		/* parse substitution */
				break;
			case CENDVAR:	/* '}' */
				if (varnest > 0) {
					varnest--;
					USTPUTC(CTLENDVAR, out);
				} else {
					USTPUTC(c, out);
				}
				break;
			case CLP:	/* '(' in arithmetic */
				parenlevel++;
				USTPUTC(c, out);
				break;
			case CRP:	/* ')' in arithmetic */
				if (parenlevel > 0) {
					USTPUTC(c, out);
					--parenlevel;
				} else {
					if (pgetc() == ')') {
						if (--arinest == 0) {
							USTPUTC(CTLENDARI, out);
							syntax = prevsyntax;
							if (syntax == DQSYNTAX)
								dblquote = 1;
							else
								dblquote = 0;
						} else
							USTPUTC(')', out);
					} else {
						/*
						 * unbalanced parens
						 *  (don't 2nd guess - no error)
						 */
						pungetc();
						USTPUTC(')', out);
					}
				}
				break;
			case CBQUOTE:	/* '`' */
				PARSEBACKQOLD();
				break;
			case CEOF:
				goto endword;		/* exit outer loop */
			default:
				if (varnest == 0)
					goto endword;	/* exit outer loop */
				USTPUTC(c, out);
			}
			c = pgetc_macro();
		}
	}
endword:
	if (syntax == ARISYNTAX)
		synerror("Missing '))'");
	if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
		synerror("Unterminated quoted string");
	if (varnest != 0) {
		startlinno = plinno;
		synerror("Missing '}'");
	}
	USTPUTC('\0', out);
	len = out - stackblock();
	out = stackblock();
	if (eofmark == NULL) {
		if ((c == '>' || c == '<')
		 && quotef == 0
		 && len <= 2
		 && (*out == '\0' || is_digit(*out))) {
			PARSEREDIR();
			return lasttoken = TREDIR;
		} else {
			pungetc();
		}
	}
	quoteflag = quotef;
	backquotelist = bqlist;
	grabstackblock(len);
	wordtext = out;
	return lasttoken = TWORD;
/* end of readtoken routine */



/*
 * Check to see whether we are at the end of the here document.  When this
 * is called, c is set to the first character of the next input line.  If
 * we are at the end of the here document, this routine sets the c to PEOF.
 */

checkend: {
	if (eofmark) {
		if (striptabs) {
			while (c == '\t')
				c = pgetc();
		}
		if (c == *eofmark) {
			if (pfgets(line, sizeof line) != NULL) {
				char *p, *q;

				p = line;
				for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
				if (*p == '\n' && *q == '\0') {
					c = PEOF;
					plinno++;
					needprompt = doprompt;
				} else {
					pushstring(line, strlen(line), NULL);
				}
			}
		}
	}
	goto checkend_return;
}


/*
 * Parse a redirection operator.  The variable "out" points to a string
 * specifying the fd to be redirected.  The variable "c" contains the
 * first character of the redirection operator.
 */

parseredir: {
	char fd = *out;
	union node *np;

	np = (union node *)stalloc(sizeof (struct nfile));
	if (c == '>') {
		np->nfile.fd = 1;
		c = pgetc();
		if (c == '>')
			np->type = NAPPEND;
		else if (c == '&')
			np->type = NTOFD;
		else if (c == '|')
			np->type = NCLOBBER;
		else {
			np->type = NTO;
			pungetc();
		}
	} else {	/* c == '<' */
		np->nfile.fd = 0;
		c = pgetc();
		if (c == '<') {
			if (sizeof (struct nfile) != sizeof (struct nhere)) {
				np = (union node *)stalloc(sizeof (struct nhere));
				np->nfile.fd = 0;
			}
			np->type = NHERE;
			heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
			heredoc->here = np;
			if ((c = pgetc()) == '-') {
				heredoc->striptabs = 1;
			} else {
				heredoc->striptabs = 0;
				pungetc();
			}
		} else if (c == '&')
			np->type = NFROMFD;
		else if (c == '>')
			np->type = NFROMTO;
		else {
			np->type = NFROM;
			pungetc();
		}
	}
	if (fd != '\0')
		np->nfile.fd = digit_val(fd);
	redirnode = np;
	goto parseredir_return;
}


/*
 * Parse a substitution.  At this point, we have read the dollar sign
 * and nothing else.
 */

parsesub: {
	int subtype;
	int typeloc;
	int flags;
	char *p;
#ifndef GDB_HACK
	static const char types[] = "}-+?=";
#endif
       int bracketed_name = 0; /* used to handle ${[0-9]*} variables */

	c = pgetc();
	if (c != '(' && c != '{' && !is_name(c) && !is_special(c)) {
		USTPUTC('$', out);
		pungetc();
	} else if (c == '(') {	/* $(command) or $((arith)) */
		if (pgetc() == '(') {
			PARSEARITH();
		} else {
			pungetc();
			PARSEBACKQNEW();
		}
	} else {
		USTPUTC(CTLVAR, out);
		typeloc = out - stackblock();
		USTPUTC(VSNORMAL, out);
		subtype = VSNORMAL;
		if (c == '{') {
			bracketed_name = 1;
			c = pgetc();
			if (c == '#') {
				if ((c = pgetc()) == '}')
					c = '#';
				else
					subtype = VSLENGTH;
			}
			else
				subtype = 0;
		}
		if (is_name(c)) {
			do {
				STPUTC(c, out);
				c = pgetc();
			} while (is_in_name(c));
		} else if (is_digit(c)) {
			if (bracketed_name) {
				do {
					STPUTC(c, out);
					c = pgetc();
				} while (is_digit(c));
			} else {
				STPUTC(c, out);
				c = pgetc();
			}
		} else {
			if (! is_special(c))
badsub:				synerror("Bad substitution");
			USTPUTC(c, out);
			c = pgetc();
		}
		STPUTC('=', out);
		flags = 0;
		if (subtype == 0) {
			switch (c) {
			case ':':
				flags = VSNUL;
				c = pgetc();
				/*FALLTHROUGH*/
			default:
				p = strchr(types, c);
				if (p == NULL)
					goto badsub;
				subtype = p - types + VSNORMAL;
				break;
			case '%':
			case '#':
				{
					int cc = c;
					subtype = c == '#' ? VSTRIMLEFT :
							     VSTRIMRIGHT;
					c = pgetc();
					if (c == cc)
						subtype++;
					else
						pungetc();
					break;
				}
			}
		} else {
			pungetc();
		}
		if (subtype != VSLENGTH && (dblquote || arinest))
			flags |= VSQUOTE;
		*(stackblock() + typeloc) = subtype | flags;
		if (subtype != VSNORMAL)
			varnest++;
	}
	goto parsesub_return;
}


/*
 * Called to parse command substitutions.  Newstyle is set if the command
 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
 * list of commands (passed by reference), and savelen is the number of
 * characters on the top of the stack which must be preserved.
 */

parsebackq: {
	struct nodelist **nlpp;
	int savepbq;
	union node *n;
	char *volatile str;
	struct jmploc jmploc;
	struct jmploc *volatile savehandler;
	int savelen;
	int saveprompt;
#if __GNUC__
	/* Avoid longjmp clobbering */
	(void) &saveprompt;
#endif

	savepbq = parsebackquote;
	if (setjmp(jmploc.loc)) {
		if (str)
			ckfree(str);
		parsebackquote = 0;
		handler = savehandler;
		longjmp(handler->loc, 1);
	}
	INTOFF;
	str = NULL;
	savelen = out - stackblock();
	if (savelen > 0) {
		str = ckmalloc(savelen);
		memcpy(str, stackblock(), savelen);
	}
	savehandler = handler;
	handler = &jmploc;
	INTON;
        if (oldstyle) {
                /* We must read until the closing backquote, giving special
                   treatment to some slashes, and then push the string and
                   reread it as input, interpreting it normally.  */
                char *out;
                int c;
                int savelen;
                char *str;


                STARTSTACKSTR(out);
		for (;;) {
			if (needprompt) {
				setprompt(2);
				needprompt = 0;
			}
			switch (c = pgetc()) {
			case '`':
				goto done;

			case '\\':
                                if ((c = pgetc()) == '\n') {
					plinno++;
					if (doprompt)
						setprompt(2);
					else
						setprompt(0);
					/*
					 * If eating a newline, avoid putting
					 * the newline into the new character
					 * stream (via the STPUTC after the
					 * switch).
					 */
					continue;
				}
                                if (c != '\\' && c != '`' && c != '$'
                                    && (!dblquote || c != '"'))
                                        STPUTC('\\', out);
				break;

			case '\n':
				plinno++;
				needprompt = doprompt;
				break;

			case PEOF:
			        startlinno = plinno;
				synerror("EOF in backquote substitution");
 				break;

			default:
				break;
			}
			STPUTC(c, out);
                }
done:
                STPUTC('\0', out);
                savelen = out - stackblock();
                if (savelen > 0) {
                        str = ckmalloc(savelen);
                        memcpy(str, stackblock(), savelen);
			setinputstring(str, 1);
                }
        }
	nlpp = &bqlist;
	while (*nlpp)
		nlpp = &(*nlpp)->next;
	*nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
	(*nlpp)->next = NULL;
	parsebackquote = oldstyle;

	if (oldstyle) {
		saveprompt = doprompt;
		doprompt = 0;
	}

	n = list(0);

	if (oldstyle)
		doprompt = saveprompt;
	else {
		if (readtoken() != TRP)
			synexpect(TRP);
	}

	(*nlpp)->n = n;
        if (oldstyle) {
		/*
		 * Start reading from old file again, ignoring any pushed back
		 * tokens left from the backquote parsing
		 */
                popfile();
		tokpushback = 0;
	}
	while (stackblocksize() <= savelen)
		growstackblock();
	STARTSTACKSTR(out);
	if (str) {
		memcpy(out, str, savelen);
		STADJUST(savelen, out);
		INTOFF;
		ckfree(str);
		str = NULL;
		INTON;
	}
	parsebackquote = savepbq;
	handler = savehandler;
	if (arinest || dblquote)
		USTPUTC(CTLBACKQ | CTLQUOTE, out);
	else
		USTPUTC(CTLBACKQ, out);
	if (oldstyle)
		goto parsebackq_oldreturn;
	else
		goto parsebackq_newreturn;
}

/*
 * Parse an arithmetic expansion (indicate start of one and set state)
 */
parsearith: {

	if (++arinest == 1) {
		prevsyntax = syntax;
		syntax = ARISYNTAX;
		USTPUTC(CTLARI, out);
		if (dblquote)
			USTPUTC('"',out);
		else
			USTPUTC(' ',out);
	} else {
		/*
		 * we collapse embedded arithmetic expansion to
		 * parenthesis, which should be equivalent
		 */
		USTPUTC('(', out);
	}
	goto parsearith_return;
}

} /* end of readtoken */
Пример #7
0
STATIC union node *
simplecmd(union node **rpp, union node *redir)
{
	union node *args, **app;
	union node **orig_rpp = rpp;
	union node *n = NULL, *n2;
	int negate = 0;

	/* If we don't have any redirections already, then we must reset */
	/* rpp to be the address of the local redir variable.  */
	if (redir == 0)
		rpp = &redir;

	args = NULL;
	app = &args;
	/*
	 * We save the incoming value, because we need this for shell
	 * functions.  There can not be a redirect or an argument between
	 * the function name and the open parenthesis.
	 */
	orig_rpp = rpp;

	while (readtoken() == TNOT) {
		TRACE(("command: TNOT recognized\n"));
		negate = !negate;
	}
	tokpushback++;

	for (;;) {
		if (readtoken() == TWORD) {
			n = (union node *)stalloc(sizeof (struct narg));
			n->type = NARG;
			n->narg.text = wordtext;
			n->narg.backquote = backquotelist;
			*app = n;
			app = &n->narg.next;
		} else if (lasttoken == TREDIR) {
			*rpp = n = redirnode;
			rpp = &n->nfile.next;
			parsefname();	/* read name of redirection file */
		} else if (lasttoken == TLP && app == &args->narg.next
					    && rpp == orig_rpp) {
			/* We have a function */
			if (readtoken() != TRP)
				synexpect(TRP);
#ifdef notdef
			if (! goodname(n->narg.text))
				synerror("Bad function name");
#endif
			n->type = NDEFUN;
			n->narg.next = command();
			goto checkneg;
		} else {
			tokpushback++;
			break;
		}
	}
	*app = NULL;
	*rpp = NULL;
	n = (union node *)stalloc(sizeof (struct ncmd));
	n->type = NCMD;
	n->ncmd.backgnd = 0;
	n->ncmd.args = args;
	n->ncmd.redirect = redir;

checkneg:
	if (negate) {
		n2 = (union node *)stalloc(sizeof (struct nnot));
		n2->type = NNOT;
		n2->nnot.com = n;
		return n2;
	}
	else
		return n;
}
Пример #8
0
STATIC union node *
command(void)
{
	union node *n1, *n2;
	union node *ap, **app;
	union node *cp, **cpp;
	union node *redir, **rpp;
	int t, negate = 0;

	checkkwd = 2;
	redir = NULL;
	n1 = NULL;
	rpp = &redir;

	/* Check for redirection which may precede command */
	while (readtoken() == TREDIR) {
		*rpp = n2 = redirnode;
		rpp = &n2->nfile.next;
		parsefname();
	}
	tokpushback++;

	while (readtoken() == TNOT) {
		TRACE(("command: TNOT recognized\n"));
		negate = !negate;
	}
	tokpushback++;

	switch (readtoken()) {
	case TIF:
		n1 = (union node *)stalloc(sizeof (struct nif));
		n1->type = NIF;
		if ((n1->nif.test = list(0)) == NULL)
			synexpect(-1);
		if (readtoken() != TTHEN)
			synexpect(TTHEN);
		n1->nif.ifpart = list(0);
		n2 = n1;
		while (readtoken() == TELIF) {
			n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
			n2 = n2->nif.elsepart;
			n2->type = NIF;
			if ((n2->nif.test = list(0)) == NULL)
				synexpect(-1);
			if (readtoken() != TTHEN)
				synexpect(TTHEN);
			n2->nif.ifpart = list(0);
		}
		if (lasttoken == TELSE)
			n2->nif.elsepart = list(0);
		else {
			n2->nif.elsepart = NULL;
			tokpushback++;
		}
		if (readtoken() != TFI)
			synexpect(TFI);
		checkkwd = 1;
		break;
	case TWHILE:
	case TUNTIL: {
		int got;
		n1 = (union node *)stalloc(sizeof (struct nbinary));
		n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
		if ((n1->nbinary.ch1 = list(0)) == NULL)
			synexpect(-1);
		if ((got=readtoken()) != TDO) {
TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : ""));
			synexpect(TDO);
		}
		n1->nbinary.ch2 = list(0);
		if (readtoken() != TDONE)
			synexpect(TDONE);
		checkkwd = 1;
		break;
	}
	case TFOR:
		if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
			synerror("Bad for loop variable");
		n1 = (union node *)stalloc(sizeof (struct nfor));
		n1->type = NFOR;
		n1->nfor.var = wordtext;
		if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) {
			app = &ap;
			while (readtoken() == TWORD) {
				n2 = (union node *)stalloc(sizeof (struct narg));
				n2->type = NARG;
				n2->narg.text = wordtext;
				n2->narg.backquote = backquotelist;
				*app = n2;
				app = &n2->narg.next;
			}
			*app = NULL;
			n1->nfor.args = ap;
			if (lasttoken != TNL && lasttoken != TSEMI)
				synexpect(-1);
		} else {
#ifndef GDB_HACK
			static const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE,
								   '@', '=', '\0'};
#endif
			n2 = (union node *)stalloc(sizeof (struct narg));
			n2->type = NARG;
			n2->narg.text = (char *)argvars;
			n2->narg.backquote = NULL;
			n2->narg.next = NULL;
			n1->nfor.args = n2;
			/*
			 * Newline or semicolon here is optional (but note
			 * that the original Bourne shell only allowed NL).
			 */
			if (lasttoken != TNL && lasttoken != TSEMI)
				tokpushback++;
		}
		checkkwd = 2;
		if ((t = readtoken()) == TDO)
			t = TDONE;
		else if (t == TBEGIN)
			t = TEND;
		else
			synexpect(-1);
		n1->nfor.body = list(0);
		if (readtoken() != t)
			synexpect(t);
		checkkwd = 1;
		break;
	case TCASE:
		n1 = (union node *)stalloc(sizeof (struct ncase));
		n1->type = NCASE;
		if (readtoken() != TWORD)
			synexpect(TWORD);
		n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
		n2->type = NARG;
		n2->narg.text = wordtext;
		n2->narg.backquote = backquotelist;
		n2->narg.next = NULL;
		while (readtoken() == TNL);
		if (lasttoken != TWORD || ! equal(wordtext, "in"))
			synerror("expecting \"in\"");
		cpp = &n1->ncase.cases;
		noaliases = 1;	/* turn off alias expansion */
		checkkwd = 2, readtoken();
		while (lasttoken != TESAC) {
			*cpp = cp = (union node *)stalloc(sizeof (struct nclist));
			cp->type = NCLIST;
			app = &cp->nclist.pattern;
			if (lasttoken == TLP)
				readtoken();
			for (;;) {
				*app = ap = (union node *)stalloc(sizeof (struct narg));
				ap->type = NARG;
				ap->narg.text = wordtext;
				ap->narg.backquote = backquotelist;
				if (checkkwd = 2, readtoken() != TPIPE)
					break;
				app = &ap->narg.next;
				readtoken();
			}
			ap->narg.next = NULL;
			if (lasttoken != TRP)
				noaliases = 0, synexpect(TRP);
			cp->nclist.body = list(0);

			checkkwd = 2;
			if ((t = readtoken()) != TESAC) {
				if (t != TENDCASE)
					noaliases = 0, synexpect(TENDCASE);
				else
					checkkwd = 2, readtoken();
			}
			cpp = &cp->nclist.next;
		}
		noaliases = 0;	/* reset alias expansion */
		*cpp = NULL;
		checkkwd = 1;
		break;
	case TLP:
		n1 = (union node *)stalloc(sizeof (struct nredir));
		n1->type = NSUBSHELL;
		n1->nredir.n = list(0);
		n1->nredir.redirect = NULL;
		if (readtoken() != TRP)
			synexpect(TRP);
		checkkwd = 1;
		break;
	case TBEGIN:
		n1 = list(0);
		if (readtoken() != TEND)
			synexpect(TEND);
		checkkwd = 1;
		break;
	/* Handle an empty command like other simple commands.  */
	case TSEMI:
	case TAND:
	case TOR:
		/*
		 * An empty command before a ; doesn't make much sense, and
		 * should certainly be disallowed in the case of `if ;'.
		 */
		if (!redir)
			synexpect(-1);
	case TNL:
	case TEOF:
	case TWORD:
	case TRP:
		tokpushback++;
		n1 = simplecmd(rpp, redir);
		goto checkneg;
	default:
		synexpect(-1);
	}

	/* Now check for redirection which may follow command */
	while (readtoken() == TREDIR) {
		*rpp = n2 = redirnode;
		rpp = &n2->nfile.next;
		parsefname();
	}
	tokpushback++;
	*rpp = NULL;
	if (redir) {
		if (n1->type != NSUBSHELL) {
			n2 = (union node *)stalloc(sizeof (struct nredir));
			n2->type = NREDIR;
			n2->nredir.n = n1;
			n1 = n2;
		}
		n1->nredir.redirect = redir;
	}

checkneg:
	if (negate) {
		n2 = (union node *)stalloc(sizeof (struct nnot));
		n2->type = NNOT;
		n2->nnot.com = n1;
		return n2;
	}
	else
		return n1;
}
Пример #9
0
STATIC union node *
command() {
      union node *n1, *n2;
      union node *ap, **app;
      union node *cp, **cpp;
      union node *redir, **rpp;
      int t;

      checkkwd();
      switch (readtoken()) {
      case TIF:
            n1 = (union node *)stalloc(sizeof (struct nif));
            n1->type = NIF;
            n1->nif.test = list(0);
            if (readtoken() != TTHEN)
                  synexpect(TTHEN);
            n1->nif.ifpart = list(0);
            n2 = n1;
            while (readtoken() == TELIF) {
                  n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
                  n2 = n2->nif.elsepart;
                  n2->type = NIF;
                  n2->nif.test = list(0);
                  if (readtoken() != TTHEN)
                        synexpect(TTHEN);
                  n2->nif.ifpart = list(0);
            }
            if (lasttoken == TELSE)
                  n2->nif.elsepart = list(0);
            else {
                  n2->nif.elsepart = NULL;
                  tokpushback++;
            }
            if (readtoken() != TFI)
                  synexpect(TFI);
            break;
      case TWHILE:
      case TUNTIL:
            n1 = (union node *)stalloc(sizeof (struct nbinary));
            n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
            n1->nbinary.ch1 = list(0);
            if (readtoken() != TDO)
                  synexpect(TDO);
            n1->nbinary.ch2 = list(0);
            if (readtoken() != TDONE)
                  synexpect(TDONE);
            break;
      case TFOR:
            if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
                  synerror("Bad for loop variable");
            n1 = (union node *)stalloc(sizeof (struct nfor));
            n1->type = NFOR;
            n1->nfor.var = wordtext;
            if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) {
                  app = &ap;
                  while (readtoken() == TWORD) {
                        n2 = (union node *)stalloc(sizeof (struct narg));
                        n2->type = NARG;
                        n2->narg.text = wordtext;
                        n2->narg.backquote = backquotelist;
                        *app = n2;
                        app = &n2->narg.next;
                  }
                  *app = NULL;
                  n1->nfor.args = ap;
            } else {
#ifndef GDB_HACK
                  static const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE,
                                                  '@', '=', '\0'};
#endif
                  n2 = (union node *)stalloc(sizeof (struct narg));
                  n2->type = NARG;
                  n2->narg.text = (char *)argvars;
                  n2->narg.backquote = NULL;
                  n2->narg.next = NULL;
                  n1->nfor.args = n2;
            }
            if (lasttoken != TNL && lasttoken != TSEMI)
                  synexpect(-1);
            checkkwd();
            if ((t = readtoken()) == TDO)
                  t = TDONE;
            else if (t == TBEGIN)
                  t = TEND;
            else
                  synexpect(-1);
            n1->nfor.body = list(0);
            if (readtoken() != t)
                  synexpect(t);
            break;
      case TCASE:
            n1 = (union node *)stalloc(sizeof (struct ncase));
            n1->type = NCASE;
            if (readtoken() != TWORD)
                  synexpect(TWORD);
            n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
            n2->type = NARG;
            n2->narg.text = wordtext;
            n2->narg.backquote = backquotelist;
            n2->narg.next = NULL;
            while (readtoken() == TNL);
            if (lasttoken != TWORD || ! equal(wordtext, "in"))
                  synerror("expecting \"in\"");
            cpp = &n1->ncase.cases;
            while (checkkwd(), readtoken() == TWORD) {
                  *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
                  cp->type = NCLIST;
                  app = &cp->nclist.pattern;
                  for (;;) {
                        *app = ap = (union node *)stalloc(sizeof (struct narg));
                        ap->type = NARG;
                        ap->narg.text = wordtext;
                        ap->narg.backquote = backquotelist;
                        if (readtoken() != TPIPE)
                              break;
                        app = &ap->narg.next;
                        if (readtoken() != TWORD)
                              synexpect(TWORD);
                  }
                  ap->narg.next = NULL;
                  if (lasttoken != TRP)
                        synexpect(TRP);
                  cp->nclist.body = list(0);
                  if ((t = readtoken()) == TESAC)
                        tokpushback++;
                  else if (t != TENDCASE)
                        synexpect(TENDCASE);
                  cpp = &cp->nclist.next;
            }
            *cpp = NULL;
            if (lasttoken != TESAC)
                  synexpect(TESAC);
            break;
      case TLP:
            n1 = (union node *)stalloc(sizeof (struct nredir));
            n1->type = NSUBSHELL;
            n1->nredir.n = list(0);
            n1->nredir.redirect = NULL;
            if (readtoken() != TRP)
                  synexpect(TRP);
            break;
      case TBEGIN:
            n1 = list(0);
            if (readtoken() != TEND)
                  synexpect(TEND);
            break;
      case TWORD:
      case TREDIR:
            tokpushback++;
            return simplecmd();
      default:
            synexpect(-1);
      }

      /* Now check for redirection which may follow command */
      rpp = &redir;
      while (readtoken() == TREDIR) {
            *rpp = n2 = redirnode;
            rpp = &n2->nfile.next;
            parsefname();
      }
      tokpushback++;
      *rpp = NULL;
      if (redir) {
            if (n1->type != NSUBSHELL) {
                  n2 = (union node *)stalloc(sizeof (struct nredir));
                  n2->type = NREDIR;
                  n2->nredir.n = n1;
                  n1 = n2;
            }
            n1->nredir.redirect = redir;
      }
      return n1;
}