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/* yForth? - A Forth interpreter written in ANSI C
* Copyright (C) 2012 Luca Padovani
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ------------------------------------------------------------------------
* Module name:
* Abstract:
*/
#include <string.h>
#include <ctype.h>
#include "yforth.h"
#include "string.h"
#include "core.h"
/**************************************************************************/
/* WORDS ******************************************************************/
/**************************************************************************/
void _dash_trailing() {
register Char *s = (Char *) sp[1];
register int i = sp[0];
while (i-- > 0) if (!isspace(s[i])) break;
sp[0] = i + 1;
}
void _slash_string() {
register Cell n = *sp++;
sp[1] = (Cell) ((Char *) sp[1] + n);
sp[0] -= n;
}
void _blank() {
register UCell u = (UCell) *sp++;
register Char *s = (Char *) *sp++;
if (u) memset(s, ' ', u);
}
void _c_move() {
register UCell u = (UCell) *sp++;
register Char *dest = (Char *) *sp++;
register Char *source = (Char *) *sp++;
while (u--) *dest++ = *source++;
}
void _c_move_up() {
register UCell u = (UCell) *sp++;
register Char *dest = (Char *) *sp++ + u;
register Char *source = (Char *) *sp++ + u;
while (u--) *--dest = *--source;
}
void _compare() {
register UCell u2 = (UCell) *sp++;
register Char *s2 = (Char *) *sp++;
register UCell u1 = (UCell) *sp++;
register Char *s1 = (Char *) *sp;
register UCell m = u2 <= u1 ? u2 : u1;
while (m) {
if (*s1 != *s2) break;
s1++;
s2++;
m--;
}
if (u1 == u2 && !m) *sp = 0;
else if (!m) *sp = u1 < u2 ? -1 : 1;
else *sp = *s1 < *s2 ? -1 : 1;
}
void _search() {
register UCell u2 = (UCell) *sp++;
register Char *s2 = (Char *) sp[0];
register UCell u1 = (UCell) sp[1];
register Char *s1 = (Char *) sp[2];
if (u2 > u1) *sp = FFLAG(0);
else {
while (u1 >= u2) {
*--sp = (Cell) s1;
*--sp = (Cell) u1;
*--sp = (Cell) s2;
*--sp = (Cell) u2;
_compare();
if (!(*sp++)) {
sp[2] = (Cell) s1;
sp[1] = (Cell) u1;
sp[0] = FFLAG(1);
break;
} else {
s1++;
u1--;
}
}
}
}
void _s_literal() {
register UCell u = (UCell) *sp++;
register Char *s = (Char *) *sp++;
compile_cell((Cell) _do_literal);
compile_cell((Cell) s);
compile_cell((Cell) _do_literal);
compile_cell((Cell) u);
}
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