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/* Sved, the SvarDOS editor
*
* Copyright (C) 2023 Mateusz Viste
*
* Sved is released under the terms of the MIT license.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <dos.h> /* _dos_open(), _dos_read(), _dos_close(), ... */
#include <fcntl.h> /* O_RDONLY, O_WRONLY */
#include <string.h>
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
#include "svarlang\svarlang.h"
#define PVER "2023.0"
#define PDATE "2023"
/*****************************************************************************
* global variables and definitions *
*****************************************************************************/
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char SCHEME_TEXT = 0x07,
SCHEME_MENU = 0x70,
SCHEME_MENU_CUR= 0x0f,
SCHEME_MENU_SEL= 0x00,
SCHEME_STBAR1 = 0x70,
SCHEME_STBAR2 = 0x70, /* greyed out information */
SCHEME_STBAR3 = 0x70, /* query */
SCHEME_SCROLL = 0x70,
SCHEME_MSG = 0x70,
SCHEME_ERR = 0x70;
static unsigned char screenw, screenh;
static struct {
unsigned char from;
unsigned char to;
unsigned char statusbar;
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
#define SCROLL_CURSOR 0xB1
struct line {
struct line far *prev;
struct line far *next;
unsigned short len;
char payload[1];
};
struct file {
struct line far *cursor;
unsigned short xoffset;
unsigned short cursorposx;
unsigned short cursorposy;
unsigned short totlines;
unsigned short curline;
char lfonly; /* set if line endings are LF (CR/LF otherwise) */
char modflag; /* non-zero if file has been modified since last save */
char modflagprev;
char fname[128];
};
/*****************************************************************************
* functions *
*****************************************************************************/
static struct line far *line_calloc(unsigned short siz) {
struct line far *res;
unsigned int seg;
if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
res = MK_FP(seg, 0);
_fmemset(res, 0, sizeof(struct line) + siz);
return(MK_FP(seg, 0));
}
static void line_free(struct line far *ptr) {
_dos_freemem(FP_SEG(ptr));
}
static int curline_resize(struct file far *db, unsigned short newsiz) {
unsigned int maxavail;
struct line far *newptr;
/* try resizing the block (much faster) */
if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
/* create a new block and copy data over */
newptr = line_calloc(newsiz);
if (newptr == NULL) return(-1);
_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
/* rewire the linked list */
db->cursor = newptr;
if (newptr->next) newptr->next->prev = newptr;
if (newptr->prev) newptr->prev->next = newptr;
return(0);
}
/* adds a new line at cursor position into file linked list and advance cursor
* returns non-zero on error */
static int line_add(struct file *db, const char far *line, unsigned short slen) {
struct line far *l;
l = line_calloc(slen);
if (l == NULL) return(-1);
l->prev = db->cursor;
if (db->cursor) {
l->next = db->cursor->next;
db->cursor->next = l;
l->next->prev = l;
}
db->cursor = l;
if (slen > 0) {
_fmemmove(l->payload, line, slen);
l->len = slen;
}
db->totlines += 1;
db->curline += 1;
return(0);
}
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
unsigned short len = 0;
unsigned char y, x;
int k;
if (maxlen == 0) return;
maxlen--; /* make room for the nul terminator */
y = screenh - 1;
/* print query string */
x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
for (;;) {
mdr_cout_locate(y, x + len);
k = keyb_getkey();
switch (k) {
case 0x1b: /* ESC */
s[0] = 0;
return;
case '\r':
s[len] = 0;
return;
case 0x08: /* BKSPC */
if (len > 0) {
len--;
mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
}
break;
default:
if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
s[len++] = k;
}
}
}
}
/* append a nul-terminated string to line at cursor position */
static int line_append(struct file *f, const char far *buf, unsigned short len) {
if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
if (curline_resize(f, f->cursor->len + len) != 0) return(-1);
_fmemmove(f->cursor->payload + f->cursor->len, buf, len);
f->cursor->len += len;
return(0);
}
static void db_rewind(struct file *db) {
if (db->cursor == NULL) return;
while (db->cursor->prev) db->cursor = db->cursor->prev;
db->curline = 0;
}
static void ui_basic(const struct file *db, unsigned short slotnum) {
const char *s = svarlang_strid(0); /* ESC=MENU */
unsigned short helpcol = screenw - strlen(s);
/* slot number */
{
char slot[4] = "#00";
slotnum++;
slot[1] += (slotnum / 10);
slot[2] += (slotnum % 10);
mdr_cout_str(screenh - 1, 0, slot, SCHEME_STBAR2, 3);
}
/* fill rest of status bar with background */
mdr_cout_char_rep(screenh - 1, 3, ' ', SCHEME_STBAR1, screenw - 1);
/* filename */
{
const char *fn = db->fname;
unsigned short x;
if (*fn == 0) fn = svarlang_str(0, 1);
x = mdr_cout_str(screenh - 1, 4, fn, SCHEME_STBAR1, screenw);
if (db->modflag) mdr_cout_char(screenh - 1, 5 + x, '*', SCHEME_STBAR1);
}
/* eol type */
{
const char *eoltype = "CRLF";
if (db->lfonly) eoltype += 2;
mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
}
mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
}
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
unsigned short x, y, msglen, i;
unsigned char msg2flag = 0;
msglen = strlen(msg1);
if (msg2) {
msg2flag = 1;
i = strlen(msg2);
if (i > msglen) msglen = i;
}
y = (screenh - 6) >> 1;
x = (screenw - msglen - 4) >> 1;
for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
x++;
mdr_cout_str(y+1, x, msg1, attr, msglen);
if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
if (uidirty.from > y) uidirty.from = y;
if (uidirty.to < y+4) uidirty.to = y+4;
}
static unsigned char ui_confirm_if_unsaved(struct file *db) {
unsigned char r = 0;
if (db->modflag == 0) return(0);
mdr_cout_cursor_hide();
/* if file has been modified then ask for confirmation */
ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
if (keyb_getkey() != '\r') r = 1;
mdr_cout_cursor_show();
return(r);
}
static void ui_refresh(const struct file *db) {
unsigned char x;
const struct line far *l;
unsigned char y = db->cursorposy;
#ifdef DBG_REFRESH
static char m = 'a';
m++;
if (m > 'z') m = 'a';
#endif
/* rewind cursor line to first line that needs redrawing */
for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
/* iterate over lines and redraw whatever needs to be redrawn */
for (; l != NULL; l = l->next, y++) {
/* skip lines that do not need to be refreshed */
if (y < uidirty.from) continue;
if (y > uidirty.to) break;
x = 0;
if (db->xoffset < l->len) {
unsigned char i, limit;
if (l->len - db->xoffset < screenw) {
limit = l->len;
} else {
limit = db->xoffset + screenw - 1;
}
for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
}
/* write empty spaces until end of line */
if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
#ifdef DBG_REFRESH
mdr_cout_char(y, 0, m, SCHEME_STBAR1);
#endif
if (y == screenh - 2) break;
}
/* fill all lines below if empty (and they need to be redrawn) */
if (l == NULL) {
while ((y < screenh - 1) && (y < uidirty.to)) {
mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
}
}
/* scroll bar */
for (y = 0; y < (screenh - 1); y++) {
mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
}
/* scroll cursor */
if (db->totlines >= screenh) {
unsigned short topline = db->curline - db->cursorposy;
unsigned short col;
unsigned short totlines = db->totlines - screenh + 1;
if (db->totlines - screenh > screenh) {
col = topline / (totlines / (screenh - 1));
} else {
col = topline * (screenh - 1) / totlines;
}
if (col >= screenh - 1) col = screenh - 2;
mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
}
}
static void check_cursor_not_after_eol(struct file *db) {
if (db->xoffset + db->cursorposx <= db->cursor->len) return;
if (db->cursor->len < db->xoffset) {
db->cursorposx = 0;
db->xoffset = db->cursor->len;
uidirty.from = 0;
uidirty.to = 0xff;
} else {
db->cursorposx = db->cursor->len - db->xoffset;
}
}
static void cursor_up(struct file *db) {
if (db->cursor->prev != NULL) {
db->curline -= 1;
db->cursor = db->cursor->prev;
if (db->cursorposy == 0) {
uidirty.from = 0;
uidirty.to = 0xff;
} else {
db->cursorposy -= 1;
}
}
}
static void cursor_eol(struct file *db) {
/* adjust xoffset to make sure eol is visible on screen */
if (db->xoffset > db->cursor->len) {
db->xoffset = db->cursor->len - 1;
uidirty.from = 0;
uidirty.to = 0xff;
}
if (db->xoffset + screenw - 1 <= db->cursor->len) {
db->xoffset = db->cursor->len - screenw + 2;
uidirty.from = 0;
uidirty.to = 0xff;
}
db->cursorposx = db->cursor->len - db->xoffset;
}
static void cursor_down(struct file *db) {
if (db->cursor->next != NULL) {
db->curline += 1;
db->cursor = db->cursor->next;
if (db->cursorposy < screenh - 2) {
db->cursorposy += 1;
} else {
uidirty.from = 0;
uidirty.to = 0xff;
}
}
}
static void cursor_left(struct file *db) {
if (db->cursorposx > 0) {
db->cursorposx -= 1;
} else if (db->xoffset > 0) {
db->xoffset -= 1;
uidirty.from = 0;
uidirty.to = 0xff;
} else if (db->cursor->prev != NULL) { /* jump to end of line above */
cursor_up(db);
cursor_eol(db);
}
}
static void cursor_home(struct file *db) {
db->cursorposx = 0;
if (db->xoffset != 0) {
db->xoffset = 0;
uidirty.from = 0;
uidirty.to = 0xff;
}
}
static void cursor_right(struct file *db) {
if (db->cursor->len > db->xoffset + db->cursorposx) {
if (db->cursorposx < screenw - 2) {
db->cursorposx += 1;
} else {
db->xoffset += 1;
uidirty.from = 0;
uidirty.to = 0xff;
}
} else if (db->cursor->next != NULL) { /* jump to start of next line */
cursor_down(db);
cursor_home(db);
}
}
static void del(struct file *db) {
if (db->cursorposx + db->xoffset < db->cursor->len) {
_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
uidirty.from = db->cursorposy;
uidirty.to = db->cursorposy;
db->modflag = '*';
} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
struct line far *nextline = db->cursor->next;
if (db->cursor->next->len > 0) {
if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
db->cursor->len += db->cursor->next->len;
}
}
db->cursor->next = db->cursor->next->next;
db->cursor->next->prev = db->cursor;
line_free(nextline);
uidirty.from = db->cursorposy;
uidirty.to = 0xff;
db->totlines -= 1;
db->modflag = '*';
}
}
static void bkspc(struct file *db) {
/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
cursor_left(db);
del(db);
}
/* returns 0 on success, 1 on file not found, 2 on other error */
static int loadfile(struct file *db, const char *fname) {
char buff[512]; /* read one entire sector at a time (faster) */
char *buffptr;
unsigned int len, llen;
int fd;
unsigned char eolfound;
/* free the entire linked list of lines */
db_rewind(db);
while (db->cursor) {
struct line far *victim;
victim = db->cursor;
db->cursor = db->cursor->next;
line_free(victim);
}
/* zero out the struct */
bzero(db, sizeof(struct file));
if (*fname == 0) goto SKIPLOADING;
memcpy(db->fname, fname, strlen(fname));
if (_dos_open(fname, O_RDONLY, &fd) != 0) {
return(1);
}
db->lfonly = 1;
/* start by adding an empty line */
if (line_add(db, NULL, 0) != 0) {
/* TODO ERROR HANDLING */
}
for (eolfound = 0;;) {
unsigned short consumedbytes;
if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
buffptr = buff;
FINDLINE:
/* look for nearest \n (also expand tabs) */
for (consumedbytes = 0;; consumedbytes++) {
if (buffptr[consumedbytes] == '\t') {
llen = consumedbytes;
break;
}
if (consumedbytes == len) {
llen = consumedbytes;
break;
}
if (buffptr[consumedbytes] == '\r') {
llen = consumedbytes;
consumedbytes++;
db->lfonly = 0;
break;
}
if (buffptr[consumedbytes] == '\n') {
eolfound = 1;
llen = consumedbytes;
consumedbytes++;
break;
}
}
/* consumedbytes is the amount of bytes processed from buffptr,
* llen is the length of line's payload (without its line terminator) */
/* append content, if line is non-empty */
if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
goto IOERR;
}
/* add a new line if necessary */
if (eolfound) {
if (line_add(db, NULL, 0) != 0) {
goto IOERR;
}
eolfound = 0;
}
/* append 8 spaces if tab char found */
if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t')) {
consumedbytes++;
if (line_append(db, " ", 8) != 0) {
goto IOERR;
}
}
/* anything left? process the buffer leftover again */
if (consumedbytes < len) {
len -= consumedbytes;
buffptr += consumedbytes;
goto FINDLINE;
}
}
_dos_close(fd);
SKIPLOADING:
/* add an empty line at end if not present already, also rewind cursor to top of file */
if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
db_rewind(db);
return(0);
IOERR:
_dos_close(fd);
return(2);
}
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
* of argc and argv, saves some 330 bytes of binary size
* returns non-zero on error */
static int parseargv(struct file *dbarr) {
char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
unsigned short count = 0;
char *arg;
unsigned short lastarg = 0;
int err;
while (!lastarg) {
/* jump to nearest arg */
while (*tail == ' ') {
*tail = 0;
tail++;
}
if (*tail == '\r') {
*tail = 0;
break;
}
arg = tail;
/* jump to next delimiter */
while ((*tail != ' ') && (*tail != '\r')) tail++;
/* if \r then remember this is the last arg */
if (*tail == '\r') lastarg = 1;
*tail = 0;
tail++;
/* look at the arg now */
if (*arg == '/') {
const char far *self = mdr_dos_selfexe();
unsigned short i;
if (self == NULL) self = "sved";
for (i = 0; self[i] != 0; i++) {
if (self[i] == '\\') {
self += i + 1;
i = 0;
}
}
mdr_coutraw_puts("sved ver " PVER " copyright (C) " PDATE " Mateusz Viste");
mdr_coutraw_crlf();
mdr_coutraw_str(svarlang_str(1,0)); /* usage: */
mdr_coutraw_char(' ');
while (*self != 0) {
mdr_coutraw_char(*self);
self++;
}
mdr_coutraw_char(' ');
mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
return(-1);
}
/* looks to be a filename */
if (count == 10) {
mdr_coutraw_puts(svarlang_str(0,12));
return(-1); /* too many files */
}
/* try loading it */
mdr_coutraw_str(svarlang_str(1,2));
mdr_coutraw_char(' ');
mdr_coutraw_puts(arg);
err = loadfile(&(dbarr[count]), arg);
if (err) {
if (err == 1) { /* file not found */
err = 11;
} else { /* general error */
err = 10;
}
mdr_coutraw_puts(svarlang_str(0,err));
return(-1);
}
count++;
}
return(0);
}
static int savefile(const struct file *db, const char *newfname) {
int fd;
const struct line far *l;
unsigned bytes;
unsigned char eollen;
unsigned char eolbuf[2];
int errflag = 0;
/* either create a new file if newfname provided, or... */
if (newfname) {
if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
} else { /* ...open db->fname */
if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
}
l = db->cursor;
while (l->prev) l = l->prev;
/* preset line terminators */
if (db->lfonly) {
eolbuf[0] = '\n';
eollen = 1;
} else {
eolbuf[0] = '\r';
eolbuf[1] = '\n';
eollen = 2;
}
while (l) {
/* do not write the last empty line, it is only useful for edition */
if (l->len != 0) {
errflag |= _dos_write(fd, l->payload, l->len, &bytes);
} else if (l->next == NULL) {
break;
}
errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
l = l->next;
}
errflag |= _dos_close(fd);
return(errflag);
}
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
if (curline_resize(db, db->cursor->len + len) == 0) {
unsigned short off = db->xoffset + db->cursorposx;
db->modflag = '*';
_fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
db->cursor->len += len;
uidirty.from = db->cursorposy;
uidirty.to = db->cursorposy;
while (len--) {
db->cursor->payload[off++] = *databuf;
databuf++;
cursor_right(db);
}
}
}
/* recompute db->curline by counting nodes in linked list */
static void recompute_curline(struct file *db) {
const struct line far *l = db->cursor;
db->curline = 0;
while (l->prev != NULL) {
db->curline += 1;
l = l->prev;
}
}
enum MENU_ACTION {
MENU_OPEN = 0,
MENU_SAVE = 1,
MENU_SAVEAS = 2,
MENU_CLOSE = 3,
MENU_CHGEOL = 4,
MENU_QUIT = 5,
MENU_NONE = 0xff
};
static enum MENU_ACTION ui_menu(void) {
unsigned short i, curchoice, attr, x, slen;
uidirty.from = 0;
uidirty.to = 0xff;
uidirty.statusbar = 1;
/* find out the longest string */
slen = 0;
for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
x = strlen(svarlang_str(8, i));
if (x > slen) slen = x;
}
curchoice = MENU_OPEN;
for (;;) {
/* render menu */
for (i = MENU_OPEN; i <= MENU_QUIT + 1; i++) {
mdr_cout_char_rep(i, 0, ' ', SCHEME_MENU, slen+3);
if (i == curchoice) {
attr = SCHEME_MENU_CUR;
mdr_cout_char(i, 0, '>', SCHEME_MENU_SEL);
} else {
attr = SCHEME_MENU;
}
x = mdr_cout_str(i, 1, svarlang_str(8, i), attr, slen);
if (i == curchoice) {
mdr_cout_char_rep(i, x + 1, ' ', SCHEME_MENU_SEL, slen - x + 1);
mdr_cout_locate(i, x + 1);
}
}
/* wait for key */
switch (keyb_getkey()) {
case '\r': return(curchoice); /* ENTER */
case 0x150: /* down */
if (curchoice == MENU_QUIT) {
curchoice = MENU_OPEN;
} else {
curchoice++;
}
break;
case 0x148: /* up */
if (curchoice == MENU_OPEN) {
curchoice = MENU_QUIT;
} else {
curchoice--;
}
break;
default: return(MENU_NONE);
}
}
}
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
uidirty.from = 0;
uidirty.to = 0xff;
uidirty.statusbar = 1;
dbarr = &(dbarr[curfile]);
ui_basic(dbarr, curfile);
ui_refresh(dbarr);
return(dbarr);
}
/* main returns nothing, ie. sved always exits with a zero exit code
* (this saves 20 bytes of executable footprint) */
void main(void) {
static struct file dbarr[10];
unsigned short curfile;
struct file *db = dbarr; /* visible file is the first slot by default */
{
unsigned short i = 0;
const char far *selfptr;
char self[128], lang[8];
selfptr = mdr_dos_selfexe();
if (selfptr != NULL) {
do {
self[i] = selfptr[i];
} while (self[i++] != 0);
svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
}
}
/* preload all slots with empty files */
for (curfile = 9;; curfile--) {
loadfile(&(dbarr[curfile]), "");
if (curfile == 0) break;
}
/* parse argv (and load files, if any passed on) */
if (parseargv(dbarr) != 0) return;
if (mdr_cout_init(&screenw, &screenh)) {
/* load color scheme if mdr_cout_init returns a color flag */
SCHEME_TEXT = 0x17;
SCHEME_MENU = 0x70;
SCHEME_MENU_CUR = 0x6f;
SCHEME_MENU_SEL = 0x66;
SCHEME_STBAR1 = 0x70;
SCHEME_STBAR2 = 0x78;
SCHEME_STBAR3 = 0x70;
SCHEME_SCROLL = 0x70;
SCHEME_MSG = 0x6f;
SCHEME_ERR = 0x4f;
}
for (;;) {
int k;
/* add an extra empty line if cursor is on last line and this line is not empty */
if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
if (line_add(db, NULL, 0) == 0) {
db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
}
}
check_cursor_not_after_eol(db);
mdr_cout_locate(db->cursorposy, db->cursorposx);
if (uidirty.from != 0xff) {
ui_refresh(db);
uidirty.from = 0xff;
}
if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag)) {
ui_basic(db, curfile);
uidirty.statusbar = 0;
db->modflagprev = db->modflag;
}
#ifdef DBG_LINENUM
{
char ddd[10];
db->curline += 1;
ddd[0] = '0' + db->curline / 100;
ddd[1] = '0' + (db->curline % 100) / 10;
ddd[2] = '0' + (db->curline % 10);
db->curline -= 1;
ddd[3] = '/';
ddd[4] = '0' + db->totlines / 100;
ddd[5] = '0' + (db->totlines % 100) / 10;
ddd[6] = '0' + (db->totlines % 10);
ddd[7] = 0;
mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
}
#endif
k = keyb_getkey();
if (k == 0x150) { /* down */
cursor_down(db);
} else if (k == 0x148) { /* up */
cursor_up(db);
} else if (k == 0x14D) { /* right */
cursor_right(db);
} else if (k == 0x14B) { /* left */
cursor_left(db);
} else if (k == 0x149) { /* pgup */
unsigned char dist = db->cursorposy + screenh - 1;
while ((dist != 0) && (db->cursor->prev != NULL)) {
db->cursor = db->cursor->prev;
dist--;
}
if (dist != 0) {
db->cursorposy = 0;
db->cursorposx = 0;
} else {
dist = db->cursorposy;
while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
}
uidirty.from = 0;
uidirty.to = 0xff;
recompute_curline(db);
} else if (k == 0x151) { /* pgdown */
unsigned char dist = screenh + screenh - db->cursorposy - 3;
while ((dist != 0) && (db->cursor->next != NULL)) {
db->cursor = db->cursor->next;
dist--;
}
if (dist != 0) {
db->cursorposy = screenh - 2;
if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
db->cursorposx = 0;
} else {
dist = screenh - 2 - db->cursorposy;
while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
}
uidirty.from = 0;
uidirty.to = 0xff;
recompute_curline(db);
} else if (k == 0x147) { /* home */
cursor_home(db);
} else if (k == 0x14F) { /* end */
cursor_eol(db);
} else if (k == 0x1B) { /* ESC */
int quitnow = 0;
char fname[25];
int saveflag = 0;
switch (ui_menu()) {
case MENU_NONE:
break;
case MENU_OPEN:
/* display a warning if unsaved changes are pending */
if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
/* ask for filename */
ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
if (fname[0] != 0) {
int err;
err = loadfile(db, fname);
if (err != 0) {
if (err == 1) {
ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
} else {
ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR); /* ERROR */
}
mdr_bios_tickswait(44); /* 3s */
loadfile(db, "");
}
}
break;
case MENU_SAVEAS:
saveflag = 1;
/* FALLTHRU */
case MENU_SAVE:
if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
if (*fname == 0) break;
saveflag = savefile(db, fname);
if (saveflag == 0) memcpy(db->fname, fname, sizeof(fname));
} else {
saveflag = savefile(db, NULL);
}
if (saveflag == 0) {
db->modflag = 0;
ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
} else {
ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
mdr_bios_tickswait(36); /* 2s */
}
break;
case MENU_CLOSE:
if (ui_confirm_if_unsaved(db) == 0) {
loadfile(db, "");
}
uidirty.from = 0;
uidirty.to = 0xff;
uidirty.statusbar = 1;
break;
case MENU_CHGEOL:
db->modflag = '*';
db->lfonly ^= 1;
break;
case MENU_QUIT:
quitnow = 1;
for (curfile = 0; curfile < 10; curfile++) {
if (dbarr[curfile].modflag) {
db = select_slot(dbarr, curfile);
if (ui_confirm_if_unsaved(db) != 0) quitnow = 0;
}
}
break;
}
if (quitnow) break;
} else if (k == 0x0D) { /* ENTER */
unsigned short off = db->xoffset + db->cursorposx;
/* add a new line */
if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
db->modflag = '*';
db->cursor = db->cursor->prev; /* back to original line */
/* trim the line above */
db->cursor->len = off;
/* move cursor to the (new) line below */
db->curline -= 1;
uidirty.from = db->cursorposy;
uidirty.to = 0xff;
cursor_down(db);
cursor_home(db);
} else {
/* ERROR: OUT OF MEMORY */
}
} else if (k == 0x153) { /* DEL */
del(db);
} else if (k == 0x008) { /* BKSPC */
bkspc(db);
} else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
char c = k;
insert_in_line(db, &c, 1);
} else if (k == 0x009) { /* TAB */
insert_in_line(db, " ", 8);
} else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
curfile = k - 0x13b;
db = select_slot(dbarr, curfile);
} else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
/* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
for (;;) {
if (db->xoffset + db->cursorposx == db->cursor->len) break;
if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
cursor_right(db);
}
/* now skip to next non-space or end of file */
for (;;) {
cursor_right(db);
if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
}
} else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
cursor_left(db);
/* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
for (;;) {
if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
cursor_left(db);
}
/* now skip to next space or start of file */
for (;;) {
cursor_left(db);
if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
cursor_right(db);
break;
}
if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
}
#ifdef DBG_UNHKEYS
} else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
char buff[4];
const char *HEX = "0123456789ABCDEF";
buff[0] = HEX[(k >> 8) & 15];
buff[1] = HEX[(k >> 4) & 15];
buff[2] = HEX[k & 15];
mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
keyb_getkey();
break;
#endif
}
}
mdr_cout_close();
/* no need to free memory, DOS will do it for me */
return;
}