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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>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h> /* _fcalloc() */
#include "mdr\cout.h"
#include "mdr\keyb.h"
#include "svarlang\svarlang.h"
#define COL_TXT 0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR 3
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
#define SCROLL_CURSOR 0xB1
struct line {
struct line far *prev;
struct line far *next;
unsigned short len;
char payload[1];
};
struct linedb {
struct line far *topscreen;
struct line far *cursor;
unsigned short xoffset;
};
/* returns non-zero on error */
static int line_add(struct linedb *db, const char far *line) {
unsigned short slen;
struct line far *l;
/* slen = strlen(line) (but for far pointer) */
for (slen = 0; line[slen] != 0; slen++);
/* trim out CR/LF line endings */
if ((slen >= 2) && (line[slen - 2] == '\r')) {
slen -= 2;
} else if ((slen >= 1) && (line[slen - 1] == '\n')) {
slen--;
}
l = _fcalloc(1, sizeof(struct line) + slen + 1);
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;
_fmemcpy(l->payload, line, slen);
l->len = slen;
return(0);
}
static void db_rewind(struct linedb *db) {
if (db->cursor == NULL) return;
while (db->cursor->prev) db->cursor = db->cursor->prev;
db->topscreen = db->cursor;
}
static void load_colorscheme(void) {
scheme[COL_TXT] = 0x17;
scheme[COL_STATUSBAR1] = 0x70;
scheme[COL_STATUSBAR2] = 0x78;
scheme[COL_SCROLLBAR] = 0x70;
}
static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {
unsigned char i;
const char *s = "HELP";
unsigned char helpcol = screenw - (strlen(s) + 4);
/* clear screen */
mdr_cout_cls(scheme[COL_TXT]);
/* status bar */
for (i = 0; i < helpcol; i++) {
mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);
if (*fname != 0) fname++;
}
mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
/* scroll bar */
for (i = 0; i < (screenh - 1); i++) {
mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
}
}
static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
unsigned char y = 0;
unsigned char len;
struct line far *l;
#ifdef DBG_REFRESH
static char m = 'a';
m++;
if (m > 'z') m = 'a';
#endif
for (l = db->topscreen; l != NULL; l = l->next, y++) {
/* skip lines that do not to be refreshed */
if (y < uidirtyfrom) continue;
if (y > uidirtyto) break;
if (db->xoffset < l->len) {
for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);
} else {
len = 0;
}
while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);
#ifdef DBG_REFRESH
mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#endif
if (y == screenh - 2) break;
}
}
static void check_cursor_not_after_eol(struct linedb *db, unsigned char *cursorpos, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
if (db->xoffset + *cursorpos <= db->cursor->len) return;
if (db->cursor->len < db->xoffset) {
*cursorpos = 0;
db->xoffset = db->cursor->len;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
} else {
*cursorpos = db->cursor->len - db->xoffset;
}
}
static void cursor_up(struct linedb *db, unsigned char *cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
if (db->cursor->prev != NULL) {
db->cursor = db->cursor->prev;
if (*cursorposy == 0) {
db->topscreen = db->cursor;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
} else {
*cursorposy -= 1;
}
}
}
static void cursor_eol(struct linedb *db, unsigned char *cursorposx, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
/* adjust xoffset to make sure eol is visible on screen */
if (db->xoffset > db->cursor->len) {
db->xoffset = db->cursor->len - 1;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
if (db->xoffset + screenw - 1 <= db->cursor->len) {
db->xoffset = db->cursor->len - screenw + 2;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
*cursorposx = db->cursor->len - db->xoffset;
}
static void cursor_down(struct linedb *db, unsigned char *cursorposy, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
if (db->cursor->next != NULL) {
db->cursor = db->cursor->next;
if (*cursorposy < screenh - 2) {
*cursorposy += 1;
} else {
db->topscreen = db->topscreen->next;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
}
}
static void cursor_home(struct linedb *db, unsigned char *cursorposx, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
*cursorposx = 0;
if (db->xoffset != 0) {
db->xoffset = 0;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
}
static void del(struct linedb *db, unsigned char cursorposx, unsigned char cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
if (cursorposx + db->xoffset < db->cursor->len) {
_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);
db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
*uidirtyfrom = cursorposy;
*uidirtyto = cursorposy;
} 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) {
void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
if (newptr != NULL) {
db->cursor = newptr;
_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
db->cursor->len += db->cursor->next->len;
/* update db->topscreen if needed */
if (cursorposy == 0) db->topscreen = db->cursor;
}
}
db->cursor->next = db->cursor->next->next;
db->cursor->next->prev = db->cursor;
if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
_ffree(nextline);
*uidirtyfrom = cursorposy;
*uidirtyto = 0xff;
}
}
/* 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 */
static char *parseargv(void) {
char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
unsigned char count = 0;
char *argv[4];
while (count < 4) {
/* jump to nearest arg */
while (*tail == ' ') {
*tail = 0;
tail++;
}
if (*tail == '\r') {
*tail = 0;
break;
}
argv[count++] = tail;
/* jump to next delimiter */
while ((*tail != ' ') && (*tail != '\r')) tail++;
}
/* check args now */
if (count != 1) return(NULL);
return(argv[0]);
}
static int loadfile(struct linedb *db, const char *fname) {
char buff[1024];
unsigned int prevlen = 0, len, llen;
int fd;
int r = 0;
if (_dos_open(fname, O_RDONLY, &fd) != 0) {
mdr_coutraw_puts("Failed to open file:");
mdr_coutraw_puts(fname);
return(-1);
}
do {
if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {
len += prevlen;
} else {
len = prevlen;
}
/* look for nearest \n and replace with 0*/
for (llen = 0; buff[llen] != '\n'; llen++) {
if (llen == sizeof(buff)) break;
}
buff[llen] = 0;
if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
if (line_add(db, buff) != 0) {
mdr_coutraw_puts("out of memory");
r = -1;
break;
}
len -= llen + 1;
memmove(buff, buff + llen + 1, len);
prevlen = len;
} while (len > 0);
_dos_close(fd);
return(r);
}
int main(void) {
const char *fname;
struct linedb db;
unsigned char screenw = 0, screenh = 0;
unsigned char cursorposx = 0, cursorposy = 0;
unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
bzero(&db, sizeof(db));
svarlang_autoload_nlspath("sved");
fname = parseargv();
if (fname == NULL) {
mdr_coutraw_puts("usage: sved file.txt");
return(0);
}
/* load file */
if (loadfile(&db, fname) != 0) return(1);
/* add an empty line at end if not present already */
if (db.cursor->len != 0) line_add(&db, "");
if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
ui_basic(screenw, screenh, fname);
db_rewind(&db);
for (;;) {
int k;
check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
mdr_cout_locate(cursorposy, cursorposx);
if (uidirtyfrom != 0xff) {
ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);
uidirtyfrom = 0xff;
}
k = keyb_getkey();
if (k == 0x150) { /* down */
cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
} else if (k == 0x148) { /* up */
cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
} else if (k == 0x14D) { /* right */
if (db.cursor->len > db.xoffset + cursorposx) {
if (cursorposx < screenw - 2) {
cursorposx++;
} else {
db.xoffset++;
uidirtyfrom = 0;
uidirtyto = 0xff;
}
} else {
cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
}
} else if (k == 0x14B) { /* left */
if (cursorposx > 0) {
cursorposx--;
} else if (db.xoffset > 0) {
db.xoffset--;
uidirtyfrom = 0;
uidirtyto = 0xff;
} else if (db.cursor->prev != NULL) { /* jump to end of line above */
cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
}
} else if (k == 0x149) { /* pgup */
// TODO
} else if (k == 0x151) { /* pgdown */
// TODO
} else if (k == 0x147) { /* home */
cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
} else if (k == 0x14F) { /* end */
cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
} else if (k == 0x1B) { /* ESC */
break;
} else if (k == 0x0D) { /* ENTER */
/* add a new line */
if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {
/* trim the line above */
db.cursor->prev->len = db.xoffset + cursorposx;
db.cursor->prev->payload[db.cursor->prev->len] = 0;
/* move cursor to the (new) line below */
cursorposx = 0;
if (cursorposy < screenh - 2) {
uidirtyfrom = cursorposy;
cursorposy++;
} else {
db.topscreen = db.topscreen->next;
uidirtyfrom = 0;
}
uidirtyto = 0xff;
} else {
/* ERROR: OUT OF MEMORY */
}
} else if (k == 0x153) { /* DEL */
del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);
} 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[COL_STATUSBAR1], 17);
mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
keyb_getkey();
break;
}
}
mdr_cout_close();
/* TODO free memory */
return(0);
}