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AT&T awk, by B. W. Kernighan, with fixes from 4.4BSD and by me

/****************************************************************
Copyright (C) AT&T and Lucent Technologies 1996
All Rights Reserved

Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the names of AT&T or Lucent Technologies
or any of their entities not be used in advertising or publicity
pertaining to distribution of the software without specific,
written prior permission.

AT&T AND LUCENT DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL AT&T OR LUCENT OR ANY OF THEIR
ENTITIES BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
USE OR PERFORMANCE OF THIS SOFTWARE.
****************************************************************/

#define DEBUG
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "awk.h"
#include "awkgram.h"

Node *nodealloc(int n)
{
	Node *x;

	x = (Node *) malloc(sizeof(Node) + (n-1)*sizeof(Node *));
	if (x == NULL)
		ERROR "out of space in nodealloc" FATAL;
	x->nnext = NULL;
	x->lineno = lineno;
	return(x);
}

Node *exptostat(Node *a)
{
	a->ntype = NSTAT;
	return(a);
}

Node *node1(int a, Node *b)
{
	Node *x;

	x = nodealloc(1);
	x->nobj = a;
	x->narg[0]=b;
	return(x);
}

Node *node2(int a, Node *b, Node *c)
{
	Node *x;

	x = nodealloc(2);
	x->nobj = a;
	x->narg[0] = b;
	x->narg[1] = c;
	return(x);
}

Node *node3(int a, Node *b, Node *c, Node *d)
{
	Node *x;

	x = nodealloc(3);
	x->nobj = a;
	x->narg[0] = b;
	x->narg[1] = c;
	x->narg[2] = d;
	return(x);
}

Node *node4(int a, Node *b, Node *c, Node *d, Node *e)
{
	Node *x;

	x = nodealloc(4);
	x->nobj = a;
	x->narg[0] = b;
	x->narg[1] = c;
	x->narg[2] = d;
	x->narg[3] = e;
	return(x);
}

Node *stat1(int a, Node *b)
{
	Node *x;

	x = node1(a,b);
	x->ntype = NSTAT;
	return(x);
}

Node *stat2(int a, Node *b, Node *c)
{
	Node *x;

	x = node2(a,b,c);
	x->ntype = NSTAT;
	return(x);
}

Node *stat3(int a, Node *b, Node *c, Node *d)
{
	Node *x;

	x = node3(a,b,c,d);
	x->ntype = NSTAT;
	return(x);
}

Node *stat4(int a, Node *b, Node *c, Node *d, Node *e)
{
	Node *x;

	x = node4(a,b,c,d,e);
	x->ntype = NSTAT;
	return(x);
}

Node *op1(int a, Node *b)
{
	Node *x;

	x = node1(a,b);
	x->ntype = NEXPR;
	return(x);
}

Node *op2(int a, Node *b, Node *c)
{
	Node *x;

	x = node2(a,b,c);
	x->ntype = NEXPR;
	return(x);
}

Node *op3(int a, Node *b, Node *c, Node *d)
{
	Node *x;

	x = node3(a,b,c,d);
	x->ntype = NEXPR;
	return(x);
}

Node *op4(int a, Node *b, Node *c, Node *d, Node *e)
{
	Node *x;

	x = node4(a,b,c,d,e);
	x->ntype = NEXPR;
	return(x);
}

Node *valtonode(Cell *a, int b)
{
	Node *x;

	a->ctype = OCELL;
	a->csub = b;
	x = node1(0, (Node *) a);
	x->ntype = NVALUE;
	return(x);
}

Node *rectonode(void)	/* make $0 into a Node */
{
	return valtonode(recloc, CFLD);
}

Node *makearr(Node *p)
{
	Cell *cp;

	if (isvalue(p)) {
		cp = (Cell *) (p->narg[0]);
		if (isfunc(cp))
			ERROR "%s is a function, not an array", cp->nval SYNTAX;
		else if (!isarr(cp)) {
			xfree(cp->sval);
			cp->sval = (char *) makesymtab(NSYMTAB);
			cp->tval = ARR;
		}
	}
	return p;
}

Node *pa2stat(Node *a, Node *b, Node *c)	/* pat, pat {...} */
{
	Node *x;

	x = node4(PASTAT2, a, b, c, (Node *) paircnt);
	paircnt++;
	x->ntype = NSTAT;
	return(x);
}

Node *linkum(Node *a, Node *b)
{
	Node *c;

	if (errorflag)	/* don't link things that are wrong */
		return a;
	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);
}

void defn(Cell *v, Node *vl, Node *st)	/* turn on FCN bit in definition, */
{					/*   body of function, arglist */
	Node *p;
	int n;

	if (isarr(v)) {
		ERROR "`%s' is an array name and a function name", v->nval SYNTAX;
		return;
	}
	v->tval = FCN;
	v->sval = (char *) st;
	n = 0;	/* count arguments */
	for (p = vl; p; p = p->nnext)
		n++;
	v->fval = n;
	dprintf( ("defining func %s (%d args)\n", v->nval, n) );
}

int isarg(char *s)		/* is s in argument list for current function? */
{			/* return -1 if not, otherwise arg # */
	extern Node *arglist;
	Node *p = arglist;
	int n;

	for (n = 0; p != 0; p = p->nnext, n++)
		if (strcmp(((Cell *)(p->narg[0]))->nval, s) == 0)
			return n;
	return -1;
}