92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
/***********************************************************
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Copyright (c) 2000, BeOpen.com.
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Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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All rights reserved.
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See the file "Misc/COPYRIGHT" for information on usage and
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redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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******************************************************************/
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#include <limits.h>
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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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#include "errcode.h"
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node *
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PyNode_New(type)
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int type;
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{
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node *n = PyMem_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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int
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PyNode_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 (nch == SHRT_MAX || nch < 0)
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return E_OVERFLOW;
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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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PyMem_RESIZE(n, node, nch1);
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if (n == NULL)
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return E_NOMEM;
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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 0;
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}
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/* Forward */
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static void freechildren Py_PROTO((node *));
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void
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PyNode_Free(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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PyMem_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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PyMem_DEL(n->n_child);
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if (STR(n) != NULL)
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PyMem_DEL(STR(n));
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}
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