heirloom-070715/oawk/parse.c

/*-
 * This code contains changes by
 *      Gunnar Ritter, Freiburg i. Br., Germany, 2002. All rights reserved.
 *
 * Conditions 1, 2, and 4 and the no-warranty notice below apply
 * to these changes.
 *
 *
 * Copyright (c) 1991
 * 	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.
 *
 *
 * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *   Redistributions of source code and documentation must retain the
 *    above copyright notice, this list of conditions and the following
 *    disclaimer.
 *   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.
 *   All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed or owned by Caldera
 *      International, Inc.
 *   Neither the name of Caldera International, Inc. nor the names of
 *    other contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
 * INTERNATIONAL, INC. 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 CALDERA INTERNATIONAL, INC. 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.
 */

/*	from 4.4BSD /usr/src/old/awk/parse.c	4.3 (Berkeley) 4/17/91	*/
/*	Sccsid @(#)parse.c	1.5 (gritter) 4/21/04>	*/

#include "awk.def"
#include "awk.h"
#include "stdio.h"
node *ALLOC(int n)
{
	register node *x;
	x = (node *) malloc(sizeof(node) + (n-1)*sizeof(node *));
	if (x == NULL)
		error(FATAL, "out of space in ALLOC");
	return(x);
}
node *exptostat(node *a)
{
	a->ntype = NSTAT;
	return(a);
}
node	*nullstat;
node *node0(intptr_t a)
{
	register node *x;
	x=ALLOC(0);
	x->nnext = NULL;
	x->nobj=a;
	return(x);
}
node *node1(intptr_t a,node *b)
{
	register node *x;
	x=ALLOC(1);
	x->nnext = NULL;
	x->nobj=a;
	x->narg[0]=b;
	return(x);
}
node *node2(intptr_t a,node *b,node *c)
{
	register node *x;
	x = ALLOC(2);
	x->nnext = NULL;
	x->nobj = a;
	x->narg[0] = b;
	x->narg[1] = c;
	return(x);
}
node *node3(intptr_t a,node *b,node *c,node *d)
{
	register node *x;
	x = ALLOC(3);
	x->nnext = NULL;
	x->nobj = a;
	x->narg[0] = b;
	x->narg[1] = c;
	x->narg[2] = d;
	return(x);
}
node *node4(intptr_t a,node *b,node *c,node *d,node *e)
{
	register node *x;
	x = ALLOC(4);
	x->nnext = NULL;
	x->nobj = a;
	x->narg[0] = b;
	x->narg[1] = c;
	x->narg[2] = d;
	x->narg[3] = e;
	return(x);
}
node *stat3(intptr_t a,node *b,node *c,node *d)
{
	register node *x;
	x = node3(a,b,c,d);
	x->ntype = NSTAT;
	return(x);
}
node *op2(intptr_t a,node *b,node *c)
{
	register node *x;
	x = node2(a,b,c);
	x->ntype = NEXPR;
	return(x);
}
node *op1(intptr_t a,node *b)
{
	register node *x;
	x = node1(a,b);
	x->ntype = NEXPR;
	return(x);
}
node *stat1(intptr_t a,node *b)
{
	register node *x;
	x = node1(a,b);
	x->ntype = NSTAT;
	return(x);
}
node *op3(intptr_t a,node *b,node *c,node *d)
{
	register node *x;
	x = node3(a,b,c,d);
	x->ntype = NEXPR;
	return(x);
}
node *stat2(intptr_t a,node *b,node *c)
{
	register node *x;
	x = node2(a,b,c);
	x->ntype = NSTAT;
	return(x);
}
node *stat4(intptr_t a,node *b,node *c,node *d,node *e)
{
	register node *x;
	x = node4(a,b,c,d,e);
	x->ntype = NSTAT;
	return(x);
}
node *valtonode(cell *a, int b)
{
	register node *x;
	x = node0((intptr_t)a);
	x->ntype = NVALUE;
	x->subtype = b;
	return(x);
}
node *pa2stat(node *a,node *b,node *c)
{
	register node *x;
	x = node3(paircnt++, a, b, c);
	x->ntype = NPA2;
	return(x);
}
node *linkum(node *a,node *b)
{
	register node *c;
	if(a == NULL) return(b);
	else if(b == NULL) return(a);
	for(c=a; c->nnext != NULL; c=c->nnext);
	c->nnext = b;
	return(a);
}
node *genprint(void)
{
	register node *x;
	x = stat2(PRINT,valtonode(lookup("$record", symtab, 0), CFLD), nullstat);
	return(x);
}