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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\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
#include "svarlang\svarlang.h"
/*****************************************************************************
* global variables and definitions *
*****************************************************************************/
#define COL_TXT 0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR 3
#define COL_MSG 4
#define COL_ERR 5
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0xf0};
static unsigned char screenw, screenh;
static struct {
unsigned char from;
unsigned char to;
} uidirty = {0, 0xff}; /* 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 {
int fd;
struct line far *cursor;
unsigned short xoffset;
unsigned char cursorposx;
unsigned char cursorposy;
unsigned short totlines;
unsigned short curline;
char lfonly; /* set if line endings are LF (CR/LF otherwise) */
char fname[1]; /* dynamically sized */
};
/*****************************************************************************
* functions *
*****************************************************************************/
/* 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 = _fcalloc(1, sizeof(struct line) + 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;
_fmemcpy(l->payload, line, slen);
l->len = slen;
db->totlines += 1;
db->curline += 1;
return(0);
}
/* append a nul-terminated string to line at cursor position */
static int line_append(struct file *f, const char far *buf, unsigned short len) {
struct line far *n;
if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
if (n == NULL) return(-1);
f->cursor = n;
_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
f->cursor->len += len;
/* rewire the linked list */
if (f->cursor->next) f->cursor->next->prev = f->cursor;
if (f->cursor->prev) f->cursor->prev->next = f->cursor;
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 load_colorscheme(void) {
scheme[COL_TXT] = 0x17;
scheme[COL_STATUSBAR1] = 0x70;
scheme[COL_STATUSBAR2] = 0x78;
scheme[COL_SCROLLBAR] = 0x70;
scheme[COL_MSG] = 0xf0;
scheme[COL_ERR] = 0x4f;
}
static void ui_basic(const struct file *db) {
const char *s = svarlang_strid(0); /* HELP */
unsigned char helpcol = screenw - (strlen(s) + 4);
/* fill status bar with background */
mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);
/* filename */
if (db->fname[0] == 0) {
mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);
} else {
mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);
}
/* eol type */
if (db->lfonly) {
mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);
} else {
mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);
}
mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
}
static void ui_msg(const char *msg, unsigned char attr) {
unsigned short x, y, msglen, i;
msglen = strlen(msg);
y = (screenh - 4) >> 1;
x = (screenw - msglen - 4) >> 1;
for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
mdr_cout_str(y+1, x+1, msg, attr, msglen);
if (uidirty.from > y) uidirty.from = y;
if (uidirty.to < y+2) uidirty.to = y+2;
}
static void ui_help(void) {
#define MAXLINLEN 35
unsigned short i, offset;
offset = (screenw - MAXLINLEN + 2) >> 1;
mdr_cout_cursor_hide();
for (i = 2; i <= 15; i++) {
mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);
}
mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
for (i = 0; i <= 4; i++) {
mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
}
mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
/* Press any key */
mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
keyb_getkey();
mdr_cout_cursor_show();
#undef MAXLINLEN
}
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[COL_TXT]);
}
/* write empty spaces until end of line */
if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);
#ifdef DBG_REFRESH
mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#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[COL_TXT], screenw - 1);
}
}
/* scroll bar */
for (y = 0; y < (screenh - 1); y++) {
mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
}
/* 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[COL_SCROLLBAR]);
}
}
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 {
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;
} 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;
}
}
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);
uidirty.from = db->cursorposy;
uidirty.to = 0xff;
db->totlines -= 1;
}
}
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);
}
/* 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 == 0) return("");
return(argv[0]);
}
static struct file *loadfile(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;
struct file *db;
len = strlen(fname) + 1;
db = calloc(1, sizeof(struct file) + len);
if (db == NULL) return(NULL);
memcpy(db->fname, fname, len);
if (*fname == 0) goto SKIPLOADING;
if (_dos_open(fname, O_RDONLY, &fd) != 0) {
mdr_coutraw_puts("Failed to open file:");
mdr_coutraw_puts(fname);
free(db);
return(NULL);
}
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 */
for (consumedbytes = 0;; consumedbytes++) {
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)) {
mdr_coutraw_puts("out of memory");
free(db);
db = NULL;
break;
}
/* add a new line if necessary */
if (eolfound) {
if (line_add(db, NULL, 0) != 0) {
/* TODO ERROR HANDLING */
mdr_coutraw_puts("out of memory");
free(db);
db = NULL;
break;
}
eolfound = 0;
}
/* 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 != NULL) {
if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
db_rewind(db);
}
return(db);
}
static int savefile(const struct file *db) {
int fd;
const struct line far *l;
unsigned bytes;
unsigned char eollen;
unsigned char eolbuf[2];
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) {
_dos_write(fd, l->payload, l->len, &bytes);
} else if (l->next == NULL) {
break;
}
_dos_write(fd, eolbuf, eollen, &bytes);
l = l->next;
}
_dos_close(fd);
return(0);
}
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
struct line far *n;
n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
if (n != NULL) {
unsigned short off = db->xoffset + db->cursorposx;
if (n->prev) n->prev->next = n;
if (n->next) n->next->prev = n;
db->cursor = n;
_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);
}
}
}
int main(void) {
const char *fname;
struct file *db;
{
char nlspath[128], lang[8];
svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
}
fname = parseargv();
if (fname == NULL) {
mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
return(0);
}
/* load file */
db = loadfile(fname);
if (db == NULL) return(1);
if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
ui_basic(db);
for (;;) {
int k;
check_cursor_not_after_eol(db);
mdr_cout_locate(db->cursorposy, db->cursorposx);
if (uidirty.from != 0xff) {
ui_refresh(db);
uidirty.from = 0xff;
}
#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[COL_STATUSBAR1], 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 */
// TODO
} else if (k == 0x151) { /* pgdown */
// TODO
} else if (k == 0x147) { /* home */
cursor_home(db);
} else if (k == 0x14F) { /* end */
cursor_eol(db);
} else if (k == 0x1B) { /* ESC */
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->cursor = db->cursor->prev; /* back to original line */
db->curline -= 1;
/* trim the line above */
db->cursor->len = off;
/* move cursor to the (new) line below */
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 */
const char *tab = " ";
insert_in_line(db, tab, 8);
} else if (k == 0x13b) { /* F1 */
ui_help();
uidirty.from = 0;
uidirty.to = 0xff;
} else if (k == 0x13f) { /* F5 */
if (savefile(db) == 0) {
ui_msg(svarlang_str(0, 2), scheme[COL_MSG]);
mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
} else {
ui_msg(svarlang_str(0, 3), scheme[COL_ERR]);
mdr_bios_tickswait(36); /* 2s */
}
} else if (k == 0x144) { /* F10 */
db->lfonly ^= 1;
ui_basic(db);
} 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;
}
} 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();
/* no need to free memory, DOS will do it for me */
return(0);
}