xref: /freebsd-10.3-release/contrib/ncurses/ncurses/tinfo/add_tries.c

/****************************************************************************
 * Copyright (c) 1998 Free Software Foundation, Inc.                        *
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 * "Software"), to deal in the Software without restriction, including      *
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 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
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 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
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 ****************************************************************************/

/****************************************************************************
 *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
 ****************************************************************************/

/*
**	add_tries.c
**
**	Add keycode/string to tries-tree.
**
*/

#include <curses.priv.h>

MODULE_ID("$Id: add_tries.c,v 1.1 1998/11/08 00:04:18 tom Exp $")

#define SET_TRY(dst,src) if ((dst->ch = *src++) == 128) dst->ch = '\0'
#define CMP_TRY(a,b) ((a)? (a == b) : (b == 128))

void _nc_add_to_try(struct tries **tree, char *str, unsigned short code)
{
	static bool     out_of_memory = FALSE;
	struct tries    *ptr, *savedptr;
	unsigned char	*txt = (unsigned char *)str;

	if (txt == 0 || *txt == '\0' || out_of_memory || code == 0)
		return;

	if ((*tree) != 0) {
		ptr = savedptr = (*tree);

		for (;;) {
			unsigned char cmp = *txt;

			while (!CMP_TRY(ptr->ch, cmp)
			       &&  ptr->sibling != 0)
				ptr = ptr->sibling;

			if (CMP_TRY(ptr->ch, cmp)) {
				if (*(++txt) == '\0') {
					ptr->value = code;
					return;
				}
				if (ptr->child != 0)
					ptr = ptr->child;
				else
					break;
			} else {
				if ((ptr->sibling = typeCalloc(struct tries,1)) == 0) {
					out_of_memory = TRUE;
					return;
				}

				savedptr = ptr = ptr->sibling;
				SET_TRY(ptr,txt);
				ptr->value = 0;

				break;
			}
		} /* end for (;;) */
	} else {   /* (*tree) == 0 :: First sequence to be added */
		savedptr = ptr = (*tree) = typeCalloc(struct tries,1);

		if (ptr == 0) {
			out_of_memory = TRUE;
			return;
		}

		SET_TRY(ptr,txt);
		ptr->value = 0;
	}

	    /* at this point, we are adding to the try.  ptr->child == 0 */

	while (*txt) {
		ptr->child = typeCalloc(struct tries,1);

		ptr = ptr->child;

		if (ptr == 0) {
			out_of_memory = TRUE;

			while ((ptr = savedptr) != 0) {
				savedptr = ptr->child;
				free(ptr);
			}

			return;
		}

		SET_TRY(ptr,txt);
		ptr->value = 0;
	}

	ptr->value = code;
	return;
}