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100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Parse tree node implementation */
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#include "pgenheaders.h"
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#include "node.h"
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node *
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newtree(type)
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int type;
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{
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node *n = NEW(node, 1);
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if (n == NULL)
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return NULL;
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n->n_type = type;
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n->n_str = NULL;
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n->n_lineno = 0;
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n->n_nchildren = 0;
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n->n_child = NULL;
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return n;
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}
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#define XXX 3 /* Node alignment factor to speed up realloc */
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#define XXXROUNDUP(n) ((n) == 1 ? 1 : ((n) + XXX - 1) / XXX * XXX)
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node *
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addchild(n1, type, str, lineno)
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register node *n1;
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int type;
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char *str;
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int lineno;
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{
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register int nch = n1->n_nchildren;
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register int nch1 = nch+1;
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register node *n;
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if (XXXROUNDUP(nch) < nch1) {
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n = n1->n_child;
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nch1 = XXXROUNDUP(nch1);
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RESIZE(n, node, nch1);
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if (n == NULL)
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return NULL;
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n1->n_child = n;
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}
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n = &n1->n_child[n1->n_nchildren++];
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n->n_type = type;
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n->n_str = str;
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n->n_lineno = lineno;
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n->n_nchildren = 0;
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n->n_child = NULL;
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return n;
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}
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/* Forward */
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static void freechildren PROTO((node *));
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void
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freetree(n)
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node *n;
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{
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if (n != NULL) {
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freechildren(n);
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DEL(n);
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}
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}
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static void
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freechildren(n)
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node *n;
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{
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int i;
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for (i = NCH(n); --i >= 0; )
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freechildren(CHILD(n, i));
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if (n->n_child != NULL)
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DEL(n->n_child);
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if (STR(n) != NULL)
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DEL(STR(n));
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}
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