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/* $Id: basic.c 40 2024-09-06 14:17:50Z nishi $ */
/* Krakow BASIC - Multi-platform simple BASIC */
#if defined(PLATFORM_X11)
#define PLATFORM_UNIX
#endif
#if defined(PLATFORM_SHIROI)
#include "dri/text.h"
#include "dri/video.h"
#include "dri/math.h"
#include "mem.h"
#include "char.h"
#define PLATFORM "Shiroi"
#define NEWLINE "\r\n"
#define BREAKKEY
#elif defined(PLATFORM_MSX)
#define PLATFORM "MSX"
#define NEWLINE "\r\n"
#define BREAKKEY
#define mull(x, y) ((x) * (y))
#define divl(x, y) ((x) / (y))
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#define agetch(x) oggetch(0)
void basic(void);
void main(void){
basic();
}
char _wgetch(char wait) __naked {
__asm
ld hl, #2
add hl, sp
ld a, (hl)
cp #1
jp z, wait
call 0x9c
jp nz, wait
ld l, a
ld h, #0
ret
wait:
call 0x9f
ld l, a
ld h, #0
ret
__endasm;
}
char oggetch(char wait){
char c = _wgetch(wait);
if(c == '\r') return '\n';
if(c == 3) return 1;
return c;
}
void putchar(char c) __naked {
__asm
ld hl, #2
add hl, sp
ld a, (hl)
call 0xa2
ret
__endasm;
}
void putstr(const char* str){
int i;
for(i = 0; str[i] != 0; i++) putchar(str[i]);
}
void putnum(int a){
char numbuf[64];
int incr = 63;
numbuf[incr--] = 0;
int i;
while(1){
numbuf[incr--] = (a % 10) + '0';
a /= 10;
if(a == 0) break;
}
putstr(numbuf + incr + 1);
}
char strcaseequ(const char* a, const char* b){
int i;
if(strlen(a) != strlen(b)) return 0;
for(i = 0; a[i] != 0; i++){
if(toupper(a[i]) != toupper(b[i])) return 0;
}
return 1;
}
void change_color(unsigned char c) __naked {
__asm
ld hl, #2
add hl, sp
ld a, (hl)
and a, #0xf
ld (0xf3ea), a
ld a, (hl)
and a, #0xf0
sra a
sra a
sra a
sra a
ld (0xf3e9), a
ld a, #1
call 0x62
ret
__endasm;
}
#define strnum atoi
void clear(void) __naked {
__asm
call 0x6f
ld a, #15
ld (0xf3e9), a
ld a, #1
ld (0xf3ea), a
ld a, #1
call 0x62
ret
__endasm;
}
#define killcursor(x)
#define cursor(x)
#elif defined(PLATFORM_UNIX) || defined(PLATFORM_WINDOWS) || defined(PLATFORM_ARDUINO) || defined(PLATFORM_C64) || defined(PLATFORM_A800XL) || defined(PLATFORM_APPLE2) || defined(PLATFORM_PET)
#if defined(PLATFORM_WINDOWS)
#define PLATFORM "Windows"
#define NO_PEEKPOKE
#elif defined(PLATFORM_UNIX)
#define PLATFORM "Unix"
#define NO_PEEKPOKE
#elif defined(PLATFORM_ARDUINO)
#define PLATFORM "Arduino"
#define NEWLINE "\r\n"
#define BREAKKEY
#elif defined(PLATFORM_C64)
#define PLATFORM "Commodore-64"
#define NEWLINE "\r\n"
#define BREAKKEY
#include <conio.h>
#elif defined(PLATFORM_PET)
#define PLATFORM "Commodore-PET"
#define NEWLINE "\r\n"
#define BREAKKEY
#include <conio.h>
#include <peekpoke.h>
#elif defined(PLATFORM_A800XL)
#define PLATFORM "Atari-800XL"
#define NEWLINE "\n"
#define BREAKKEY
#include <conio.h>
#elif defined(PLATFORM_APPLE2)
#define PLATFORM "Apple2"
#define NEWLINE "\n"
#define BREAKKEY
#include <conio.h>
#endif
#define mull(x, y) ((x) * (y))
#define divl(x, y) ((x) / (y))
#define killcursor(x)
#define cursor(x)
#define strnum atoi
#ifndef NEWLINE
#define NEWLINE "\n"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdbool.h>
#if defined(__MINGW32__)
#include <conio.h>
#include <windows.h>
#elif defined(PLATFORM_ARDUINO)
#define BAUD 9600
#include <avr/io.h>
#include <util/delay.h>
#include <util/setbaud.h>
#define BUFFER_SIZE (1024)
#define LINE_BUFFER_SIZE (128)
#define LINES (32)
#undef putchar
#define putchar uart_putchar
#elif defined(PLATFORM_UNIX)
#if defined(PLATFORM_X11)
#include <X11/Xlib.h>
#include <pthread.h>
void* x11_thread(void* arg);
char x11_putchar(char c);
void x11_init(void);
#else
#include <termios.h>
#include <sys/ioctl.h>
#endif
#elif defined(PLATFORM_PET)
#define BUFFER_SIZE (4 * 1024)
#undef killcursor
#undef cursor
#define killcursor(x) cursor(0)
#define cursor(x) cursor(1)
#elif defined(PLATFORM_C64)
#define BUFFER_SIZE (16 * 1024)
#undef killcursor
#undef cursor
#define killcursor(x) cursor(0)
#define cursor(x) cursor(1)
#elif defined(PLATFORM_A800XL)
#define BUFFER_SIZE (16 * 1024)
#undef killcursor
#undef cursor
#define killcursor(x) cursor(0)
#define cursor(x) cursor(1)
#elif defined(PLATFORM_APPLE2)
#define BUFFER_SIZE (8 * 1024)
#undef killcursor
#undef cursor
#define killcursor(x) cursor(0)
#define cursor(x) cursor(1)
#endif
#if defined(PLATFORM_ARDUINO)
int uart_putchar(char c) {
while(!(UCSR0A & _BV(UDRE0)))
;
UDR0 = c;
return 0;
}
void uart_init(void) {
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
UCSR0B |= _BV(TXEN0) | _BV(RXEN0);
UCSR0C |= _BV(UCSZ00) | _BV(UCSZ01);
}
#endif
#if defined(PLATFORM_X11)
#undef putchar
#define putchar(x) x11_putchar(x)
#endif
#define agetch() oggetch(0)
char oggetch(char wait)
#if defined(PLATFORM_X11)
;
#else
{
int c;
#if defined(PLATFORM_WINDOWS)
rescan:
if(!wait){
if(!_kbhit()) return 0;
}
c = _getch();
if(c == '\r') return '\n';
if(c == '\n') goto rescan;
#elif defined(PLATFORM_UNIX)
if(!wait){
int b;
ioctl(0, FIONREAD, &b);
if(b == 0) return 0;
}
c = getchar();
if(c == EOF) return -1;
if(c == '\r') return '\n';
#elif defined(PLATFORM_ARDUINO)
rescan:
if(!wait) {
if(!(UCSR0A & _BV(RXC0))) return 0;
} else {
while(!(UCSR0A & _BV(RXC0)))
;
}
c = UDR0;
if(c == '\r') return '\n';
if(c == '\n') goto rescan;
if(c == 3) return 1;
#elif defined(PLATFORM_C64) || defined(PLATFORM_PET)
if(!wait) {
if(!kbhit()) return 0;
}
c = cgetc();
if(c == EOF) return -1;
if(c == '\r') return '\n';
if(c == 20) return 8;
if(c == 3) return 1;
#elif defined(PLATFORM_A800XL)
if(!wait) {
if(!kbhit()) return 0;
}
c = cgetc();
if(c == EOF) return -1;
if(c == '\r') return '\n';
if(c == 126) return 8;
if(c == 3) return 1;
#elif defined(PLATFORM_APPLE2)
if(!wait) {
if(!kbhit()) return 0;
}
c = cgetc();
if(c == EOF) return -1;
if(c == '\r') return '\n';
if(c == 3) return 1;
#endif
return c;
}
#endif
bool strcaseequ(const char* a, const char* b) { return strcasecmp(a, b) == 0; }
#if defined(PLATFORM_ARDUINO)
void putstr(const char* n) {
int i;
for(i = 0; n[i] != 0; i++) {
uart_putchar(n[i]);
}
}
void putnum(int n) {
char buf[64];
int incr = 63;
buf[incr--] = 0;
while(1) {
buf[incr--] = (n % 10) + '0';
n /= 10;
if(n == 0) break;
}
putstr(buf + incr + 1);
}
#else
void putnum(int n)
#if defined(PLATFORM_X11)
;
#else
{
printf("%d", n);
fflush(stdout);
}
#endif
void putstr(const char* n)
#if defined(PLATFORM_X11)
;
#else
{
printf("%s", n);
fflush(stdout);
}
#endif
#endif
void change_color(int a)
#if defined(PLATFORM_X11)
;
#else
{
#if defined(PLATFORM_ARDUINO) || defined(PLATFORM_UNIX)
int fg = (a >> 4) & 0xf;
int bg = (a & 0xf);
char color[2];
if(!(0 <= fg && fg <= 15)) return;
if(!(0 <= bg && bg <= 15)) return;
color[1] = 0;
if(bg < 8) {
color[0] = bg + '0';
putstr("\x1b[4");
} else {
color[0] = (bg - 8) + '0';
putstr("\x1b[10");
}
putstr(color);
putstr("m");
if(fg < 8) {
color[0] = fg + '0';
putstr("\x1b[3");
} else {
color[0] = (fg - 8) + '0';
putstr("\x1b[9");
}
putstr(color);
putstr("m");
putstr("\x1b[2J\x1b[1;1H");
#elif defined(PLATFORM_C64) || defined(PLATFORM_A800XL) || defined(PLATFORM_APPLE2) || defined(PLATFORM_PET)
int fg = (a >> 4) & 0xf;
int bg = (a & 0xf);
bgcolor(bg);
textcolor(fg);
#endif
}
#endif
void clear(void)
#if defined(PLATFORM_X11)
;
#else
{
#if defined(PLATFORM_WINDOWS)
system("cls");
#elif defined(PLATFORM_UNIX) || defined(PLATFORM_ARDUINO)
putstr("\x1b[0m\x1b[2J\x1b[1;1H");
#elif defined(PLATFORM_C64) || defined(PLATFORM_A800XL) || defined(PLATFORM_APPLE2) || defined(PLATFORM_PET)
clrscr();
#endif
}
#endif
void basic(void);
int main() {
#if defined(PLATFORM_PET)
if(PEEK(0x9000) == POKE(0x9000, PEEK(0x9000) + 1)) {
_heapadd((void*)0x9000, 0x2000);
}
#endif
#if defined(PLATFORM_WINDOWS)
HANDLE winstdout = GetStdHandle(STD_OUTPUT_HANDLE);
DWORD mode = 0;
GetConsoleMode(winstdout, &mode);
const DWORD origmode = mode;
mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
SetConsoleMode(winstdout, mode);
#elif defined(PLATFORM_UNIX)
#if defined(PLATFORM_X11)
pthread_t thread;
x11_init();
pthread_create(&thread, NULL, x11_thread, NULL);
#else
struct termios old, new;
tcgetattr(0, &old);
new = old;
new.c_lflag &= ~(ECHO | ICANON);
tcsetattr(0, TCSANOW, &new);
#endif
#elif defined(PLATFORM_ARDUINO)
uart_init();
DDRB |= _BV(DDB5);
PORTB |= _BV(PORT5);
#endif
#if defined(PLATFORM_C64) || defined(PLATFORM_A800XL) || defined(PLATFORM_APPLE2) || defined(PLATFORM_PET)
change_color((1 << 4) | 0);
bordercolor(0);
#endif
basic();
#if defined(PLATFORM_WINDOWS)
SetConsoleMode(winstdout, origmode);
#elif defined(PLATFORM_UNIX)
#if defined(PLATFORM_X11)
pthread_join(thread, NULL);
#else
tcsetattr(0, TCSANOW, &old);
#endif
#endif
}
#else
#error "Define PLATFORM_*"
#endif
#define VERSION "0.0"
#ifndef LINE_BUFFER_SIZE
#define LINE_BUFFER_SIZE (512)
#endif
#ifndef BUFFER_SIZE
#define BUFFER_SIZE (1024 * 24)
#endif
#ifndef LINES
#define LINES (1024)
#endif
unsigned char basicbuffer[BUFFER_SIZE / 2];
unsigned char varbuffer[BUFFER_SIZE / 2];
char linebuf[LINE_BUFFER_SIZE];
int hexnum(char c) {
if('0' <= c && c <= '9') {
return c - '0';
} else if('A' <= c && c <= 'F') {
return c - 'A' + 10;
} else if('a' <= c && c <= 'f') {
return c - 'a' + 10;
}
return 0;
}
int pexpr(char* expr, char* buffer, int* number) {
char ownbuf[128];
int i;
int start = 0;
int br = 0;
int result = 0;
int stack[32];
int sp = 0;
char put = 0;
char hex = 0;
if(expr[0] == '"' && expr[strlen(expr) - 1] == '"'){
for(i = 1; expr[i + 1] != 0; i++){
buffer[i - 1] = expr[i];
}
buffer[i - 1] = 0;
return 0;
}
for(i = 0; expr[i] != 0; i++) ownbuf[i] = expr[i];
ownbuf[i] = 0;
for(i = 0; i < 32; i++) stack[i] = 0;
for(i = 0;; i++) {
if(ownbuf[i] == 0) {
break;
} else if(ownbuf[i] == '&' && put == 0) {
put = 1;
hex = 1;
} else if(('0' <= ownbuf[i] && ownbuf[i] <= '9') || (hex ? ('A' <= ownbuf[i] && ownbuf[i] <= 'F') : 0) || (hex ? ('a' <= ownbuf[i] && ownbuf[i] <= 'f') : 0)) {
stack[sp] *= hex ? 16 : 10;
if(hex == 1) {
stack[sp] += hexnum(ownbuf[i]);
} else {
stack[sp] += ownbuf[i] - '0';
}
put = 1;
#ifndef NO_PEEKPOKE
} else if(ownbuf[i] == 'R') {
put = 0;
hex = 0;
if(sp < 1) {
return -1;
} else {
int top = stack[--sp];
stack[sp++] = (int)*(unsigned char*)top;
}
stack[sp] = 0;
#endif
} else if(ownbuf[i] == '+' || ownbuf[i] == '-' || ownbuf[i] == '*' || ownbuf[i] == '/') {
put = 0;
hex = 0;
if(sp < 2) {
return -1;
} else {
int top = stack[--sp];
int bottom = stack[--sp];
int value = 0;
if(ownbuf[i] == '+') {
value = top + bottom;
} else if(ownbuf[i] == '-') {
value = bottom + top;
} else if(ownbuf[i] == '*') {
value = mull(top, bottom);
} else if(ownbuf[i] == '/') {
value = divl(bottom, top);
}
stack[sp++] = value;
}
stack[sp] = 0;
} else if(ownbuf[i] == ' ' && put == 1) {
stack[++sp] = 0;
}
}
result = stack[0];
*number = result;
return 1;
}
/* arr gets sorted, arr2 index gets replaced */
void sort(int* arr, int* arr2, int size) {
int i;
redo:
for(i = 1; i < size; i++) {
if(arr[i - 1] > arr[i]) {
int tmp = arr[i];
arr[i] = arr[i - 1];
arr[i - 1] = tmp;
tmp = arr2[i];
arr2[i] = arr2[i - 1];
arr2[i - 1] = tmp;
}
}
for(i = 1; i < size; i++) {
if(arr[i - 1] > arr[i]) {
goto redo;
}
}
}
int run(char* cmd, int linenum, char num, int* lgoto) {
char line[LINE_BUFFER_SIZE];
char rcmd[32];
int i;
char* arg;
int incr = 0;
#ifdef BREAKKEY
if(agetch() == 1) return -1;
#endif
if(lgoto != 0) *lgoto = 0;
for(i = 0; cmd[i] != 0; i++) line[i] = cmd[i];
line[i] = 0;
rcmd[0] = 0;
for(i = 0;; i++) {
if(line[i] == ' ' || line[i] == '\t' || line[i] == 0 || line[i] == '"') {
break;
} else {
rcmd[incr++] = line[i];
if(incr == 32) {
putstr("! Command too long");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
rcmd[incr] = 0;
}
}
arg = line + 1 + strlen(rcmd);
if(strcaseequ(rcmd, "COLOR")) {
int argc = 0;
char* farg = 0;
char* sarg = 0;
int fgcolor, bgcolor, ret0, ret1;
if(arg[0] != 0) argc++;
for(i = 0; arg[i] != 0; i++) {
if(arg[i] == ',') {
arg[i] = 0;
farg = arg;
sarg = arg + i + 1;
for(; *sarg != 0 && (*sarg == '\t' || *sarg == ' '); sarg++)
;
argc++;
}
}
if(argc != 2) {
putstr("! Invalid argument");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
bgcolor = 0;
fgcolor = 0;
ret0 = pexpr(farg, 0, &bgcolor);
ret1 = pexpr(sarg, 0, &fgcolor);
if(ret0 == 0) {
putstr("! Invalid argument");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
} else if(ret0 == -1) {
putstr("! Syntax error");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
if(ret1 == 1) {
change_color((fgcolor << 4) | bgcolor);
} else if(ret1 == 0) {
putstr("! Invalid argument");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
} else if(ret1 == -1) {
putstr("! Syntax error");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
} else if(strcaseequ(rcmd, "PRINT")){
if(arg[0] != 0){
char sc = 0;
int incr = 0;
for(i = 0;; i++) {
if(arg[i] != 0) sc = 0;
if(arg[i] == ';' || arg[i] == 0) {
char oldc = arg[i];
arg[i] = 0;
if(strlen(arg + incr) > 0){
char buffer[128];
int number;
int ret = pexpr(arg + incr, buffer, &number);
if(ret == 0){
putstr(buffer);
}else if(ret == 1){
putstr(" ");
putnum(number);
}else if(ret == -1){
putstr("! Syntax error");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
}
incr = i + 1;
if(oldc == ';') sc = 1;
if(oldc == 0) break;
}
}
if(!sc) putstr(NEWLINE);
}else{
putstr(NEWLINE);
}
#ifndef NO_PEEKPOKE
} else if(strcaseequ(rcmd, "POKE")) {
int argc = 0;
char* farg = 0;
char* sarg = 0;
int addr, data, ret0, ret1;
if(arg[0] != 0) argc++;
for(i = 0; arg[i] != 0; i++) {
if(arg[i] == ',') {
arg[i] = 0;
farg = arg;
sarg = arg + i + 1;
for(; *sarg != 0 && (*sarg == '\t' || *sarg == ' '); sarg++)
;
argc++;
}
}
if(argc != 2) {
putstr("! Invalid argument");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
addr = 0;
data = 0;
ret0 = pexpr(farg, 0, &addr);
ret1 = pexpr(sarg, 0, &data);
if(ret0 == 0) {
putstr("! Invalid argument");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
} else if(ret0 == -1) {
putstr("! Syntax error");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
if(ret1 == 1) {
unsigned char* a = (unsigned char*)addr;
*a = data;
} else if(ret1 == 0) {
putstr("! Invalid argument");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
} else if(ret1 == -1) {
putstr("! Syntax error");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
#endif
} else if(num == 0 && strcaseequ(rcmd, "LIST")) {
int addr = BUFFER_SIZE - 1;
int saddr = 0;
int lbuf[LINES];
int shift[LINES];
int cnt = 0;
int i;
while(1) {
unsigned long ln = 0;
for(i = 0; i < 4; i++) {
ln >>= 8;
ln |= (unsigned long)basicbuffer[addr--] << 24;
}
if(ln == 0) break;
lbuf[cnt] = ln;
shift[cnt++] = saddr;
saddr += strlen(basicbuffer + saddr) + 1;
}
sort(lbuf, shift, cnt);
for(i = 0; i < cnt; i++) {
putnum(lbuf[i]);
putstr(" ");
putstr(basicbuffer + shift[i]);
putstr(NEWLINE);
}
} else if(num == 1 && strcaseequ(rcmd, "GOTO")) {
int ret = pexpr(arg, 0, lgoto);
if(ret == 0) {
putstr("! Invalid argument");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
} else if(ret == -1) {
putstr("! Syntax error");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
} else if(num == 0 && strcaseequ(rcmd, "RUN")) {
int addr = BUFFER_SIZE - 1;
int saddr = 0;
int lbuf[LINES];
int shift[LINES];
int cnt = 0;
int gt, i;
while(1) {
unsigned long ln = 0;
for(i = 0; i < 4; i++) {
ln >>= 8;
ln |= (unsigned long)basicbuffer[addr--] << 24;
}
if(ln == 0) break;
lbuf[cnt] = ln;
shift[cnt++] = saddr;
saddr += strlen(basicbuffer + saddr) + 1;
}
sort(lbuf, shift, cnt);
for(i = 0; i < cnt; i++) {
int ret = run(basicbuffer + shift[i], lbuf[i], 1, >);
if(ret != 0) return ret;
if(gt != 0) {
char found;
for(i = 0; i < cnt; i++) {
if(lbuf[i] == gt) {
found = 1;
break;
}
}
if(found) {
i--;
} else {
putstr("! GOTO no such line");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
}
}
} else {
putstr("! Unknown command");
if(linenum != -1) {
putstr(" in line ");
putnum(linenum);
}
putstr(NEWLINE);
return 1;
}
return 0;
}
int execute(int linenum, char* cmd, char num) {
int i;
char line[LINE_BUFFER_SIZE];
int incr = 0;
char dq = 0;
for(i = 0; cmd[i] != 0; i++) {
if(cmd[i] == ' ' || cmd[i] == '\t') {
if(!dq) {
for(; cmd[i] != 0 && (cmd[i] == ' ' || cmd[i] == '\t'); i++)
;
i--;
}
line[incr++] = cmd[i];
} else if(cmd[i] == '"') {
line[incr++] = '"';
dq = dq == 0 ? 1 : 0;
} else {
line[incr++] = dq == 0 ? toupper(cmd[i]) : cmd[i];
}
}
line[incr] = 0;
if(num == 0) {
int ret = run(line, -1, 0, 0);
putstr("Ready");
putstr(NEWLINE);
return ret;
} else {
int addr = BUFFER_SIZE - 1;
int i;
int shf = 0;
int cnt = 0;
int len;
while(1) {
unsigned long ln = 0;
for(i = 0; i < 4; i++) {
ln >>= 8;
ln |= (unsigned long)basicbuffer[addr--] << 24;
}
cnt++;
if(ln == linenum) shf = cnt;
if(shf != 0) {
addr += 4;
for(i = 0; i < 4; i++) {
basicbuffer[addr] = basicbuffer[addr - 4 * shf];
addr--;
}
addr += 4;
ln = 0;
for(i = 0; i < 4; i++) {
ln >>= 8;
ln |= (unsigned long)basicbuffer[addr--] << 24;
}
}
if(ln == 0) break;
}
if(line[0] != 0) {
addr += 4;
for(i = 0; i < 4; i++) {
basicbuffer[addr--] = linenum & 0xff;
linenum >>= 8;
}
}
len = 0;
cnt = 0;
while(1) {
int slen = strlen(basicbuffer + len);
if(slen == 0) break;
len += slen + 1;
cnt++;
}
if(line[0] != 0) {
for(i = 0; line[i] != 0; i++) {
basicbuffer[len + i] = line[i];
}
basicbuffer[len + i] = 0;
basicbuffer[len + i + 1] = 0;
}
if(shf != 0) {
cnt = 0;
len = 0;
while(1) {
int slen = strlen(basicbuffer + len);
if(slen == 0) break;
len += slen + 1;
cnt++;
if(cnt == shf) {
int i;
int nc = 0;
len -= slen + 1;
for(i = len;; i++) {
basicbuffer[i] = basicbuffer[i + slen + 1];
if(basicbuffer[i] == 0) {
nc++;
if(nc == 2) break;
} else {
nc = 0;
}
}
break;
}
}
}
return 0;
}
}
void basic(void) {
int i;
int lineind;
clear();
#ifdef SMALL
putstr("Krakow BASIC Ver. ");
putstr(VERSION);
putstr(NEWLINE);
putstr(NEWLINE);
#else
putstr(PLATFORM);
putstr(" Krakow BASIC V");
putstr(VERSION);
putstr(NEWLINE);
putstr("Copyright 2024 by: Nishi.");
putstr(NEWLINE);
putstr(" penguin2233.");
putstr(NEWLINE);
putstr(NEWLINE);
putstr(" Max ");
putnum(LINE_BUFFER_SIZE);
putstr(" characters per line");
putstr(NEWLINE);
putstr(" Max ");
putnum(LINES);
putstr(" lines");
putstr(NEWLINE);
putstr(" ");
putstr("Variable buffer ");
putnum(BUFFER_SIZE / 2);
putstr(" bytes");
putstr(NEWLINE);
putstr(" ");
#endif
putnum(BUFFER_SIZE / 2);
putstr(" bytes free");
putstr(NEWLINE);
putstr(NEWLINE);
for(i = 0; i < BUFFER_SIZE / 2; i++) {
basicbuffer[i] = 0;
}
putstr("Ready");
putstr(NEWLINE);
cursor();
linebuf[0] = 0;
lineind = 0;
while(1) {
char c;
#if defined(PLATFORM_C64) || defined(PLATFORM_A800XL) || defined(PLATFORM_APPLE2) || defined(PLATFORM_PET) || defined(PLATFORM_MSX)
c = oggetch(1);
#else
c = agetch();
#endif
if(c != 0) {
killcursor();
}
if(c == 1) {
putstr("Break");
putstr(NEWLINE);
lineind = 0;
} else if(c == '\n') {
int i;
char num = 1;
char* cmd = linebuf;
linebuf[lineind] = 0;
putstr(NEWLINE);
if(lineind == 0) goto skip;
for(i = 0; linebuf[i] != 0; i++) {
if(linebuf[i] == ' ') {
linebuf[i] = 0;
cmd = linebuf + i + 1;
break;
} else if(!('0' <= linebuf[i] && linebuf[i] <= '9')) {
num = 0;
break;
}
}
if(num == 1 && strnum(linebuf) == 0) {
putstr("! Line number 0 is illegal");
putstr(NEWLINE);
} else {
int ret = execute(num == 1 ? strnum(linebuf) : -1, (num == 1 && cmd == linebuf) ? "" : cmd, num);
if(ret == -1) {
putstr("! Break");
putstr(NEWLINE);
}
}
skip:
lineind = 0;
} else if(c == 0x8 || c == 0x7f) {
if(lineind > 0) {
#if defined(PLATFORM_A800XL)
putstr("\x7e \x7e");
#else
putstr("\x08 \x08");
#endif
linebuf[--lineind] = 0;
}
} else if(c == -1) {
break;
} else if(c != 0) {
putchar(c);
if(lineind <= LINE_BUFFER_SIZE){
linebuf[lineind++] = c;
}
}
cursor();
}
}