175 lines
2.7 KiB
C
175 lines
2.7 KiB
C
/* Copyright (c) 1984 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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/* #ident "@(#)awk:parse.c 1.3" */
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#ident "$Header: /proj/irix6.5.7m/isms/eoe/cmd/oawk/RCS/parse.c,v 1.3 1986/09/17 19:38:39 scott Exp $"
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#include "awk.def"
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#include "awk.h"
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#include "stdio.h"
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NODE *nodealloc(n)
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{
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register NODE *x;
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x = (NODE *) malloc(sizeof(NODE) + (n-1)*sizeof(NODE *));
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if (x == NULL)
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error(FATAL, "out of space in nodealloc");
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return(x);
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}
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NODE *exptostat(a) NODE *a;
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{
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a->ntype = NSTAT;
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return(a);
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}
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NODE *node0(a)
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{
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register NODE *x;
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x = nodealloc(0);
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x->nnext = NULL;
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x->nobj = a;
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return(x);
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}
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NODE *node1(a,b) NODE *b;
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{
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register NODE *x;
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x = nodealloc(1);
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x->nnext = NULL;
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x->nobj = a;
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x->narg[0]=b;
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return(x);
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}
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NODE *node2(a,b,c) NODE *b, *c;
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{
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register NODE *x;
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x = nodealloc(2);
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x->nnext = NULL;
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x->nobj = a;
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x->narg[0] = b;
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x->narg[1] = c;
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return(x);
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}
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NODE *node3(a,b,c,d) NODE *b, *c, *d;
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{
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register NODE *x;
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x = nodealloc(3);
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x->nnext = NULL;
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x->nobj = a;
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x->narg[0] = b;
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x->narg[1] = c;
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x->narg[2] = d;
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return(x);
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}
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NODE *node4(a,b,c,d,e) NODE *b, *c, *d, *e;
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{
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register NODE *x;
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x = nodealloc(4);
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x->nnext = NULL;
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x->nobj = a;
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x->narg[0] = b;
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x->narg[1] = c;
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x->narg[2] = d;
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x->narg[3] = e;
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return(x);
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}
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NODE *stat3(a,b,c,d) NODE *b, *c, *d;
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{
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register NODE *x;
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x = node3(a,b,c,d);
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x->ntype = NSTAT;
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return(x);
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}
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NODE *op2(a,b,c) NODE *b, *c;
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{
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register NODE *x;
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x = node2(a,b,c);
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x->ntype = NEXPR;
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return(x);
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}
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NODE *op1(a,b) NODE *b;
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{
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register NODE *x;
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x = node1(a,b);
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x->ntype = NEXPR;
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return(x);
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}
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NODE *stat1(a,b) NODE *b;
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{
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register NODE *x;
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x = node1(a,b);
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x->ntype = NSTAT;
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return(x);
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}
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NODE *op3(a,b,c,d) NODE *b, *c, *d;
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{
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register NODE *x;
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x = node3(a,b,c,d);
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x->ntype = NEXPR;
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return(x);
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}
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NODE *stat2(a,b,c) NODE *b, *c;
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{
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register NODE *x;
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x = node2(a,b,c);
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x->ntype = NSTAT;
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return(x);
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}
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NODE *stat4(a,b,c,d,e) NODE *b, *c, *d, *e;
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{
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register NODE *x;
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x = node4(a,b,c,d,e);
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x->ntype = NSTAT;
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return(x);
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}
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NODE *valtonode(a, b) CELL *a;
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{
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register NODE *x;
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x = node0(a);
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x->ntype = NVALUE;
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x->subtype = b;
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return(x);
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}
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NODE *pa2stat(a,b,c) NODE *a, *b, *c;
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{
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register NODE *x;
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x = node4(PASTAT2, a, b, c, (NODE *) paircnt);
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paircnt++;
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x->ntype = NSTAT;
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return(x);
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}
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NODE *linkum(a,b) NODE *a, *b;
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{
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register NODE *c;
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if(a == NULL) return(b);
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else if(b == NULL) return(a);
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for (c = a; c->nnext != NULL; c=c->nnext)
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;
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c->nnext = b;
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return(a);
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}
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NODE *genprint()
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{
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register NODE *x;
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x = stat2(PRINT,valtonode(lookup("$record", symtab, 0), CFLD), NULL);
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return(x);
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}
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