ROSE/textedit.c

245 lines
8.6 KiB
C
Raw Normal View History

#include "progs.h"
#define MAXFILESIZE 0x300000 // 3MB
#define MAXLINES 100000
#define BLOCKSIZE 0x1000
#define BLOCKMASK 0xfff
#define BLOCKSHIFT 12
#define TOTALBLOCKS (MAXFILESIZE/BLOCKSIZE)
uintptr_t lineOffsets[MAXLINES] __attribute__((section(".textbss")));;
uintptr_t lineLengths[MAXLINES] __attribute__((section(".textbss")));;
uint8_t editedBlocks[TOTALBLOCKS] __attribute__((section(".textbss")));;
uint8_t fileBuffer[MAXFILESIZE]
__attribute__((aligned(0x1000)))
__attribute__((section(".textlatebss")));
void TextViewTest(char *path) {
uint16_t *vga_text = (uint16_t *)0xb8000;
uint32_t fileLen;
{
uint32_t err;
dirent de;
err = path_getinfo(path, &de);
if (err) {
vga_text += printStr("Error getting file info.", vga_text);
kbd_wait();
return;
}
fileLen = de.size;
FILE file;
err = file_open(&file, path, OPENREAD);
if (err) {
vga_text += printStr("Open Error: ", vga_text);
printDword(err, vga_text);
kbd_wait();
return;
}
// file too large
if (fileLen > MAXFILESIZE) {
vga_text += printStr("File too large.", vga_text);
kbd_wait();
return;
}
if (file_seek(&file, 0)) {
vga_text += printStr("Seek Error", vga_text);
kbd_wait();
return;
}
uint32_t bytesRead = file_read(&file, fileBuffer, fileLen);
if (bytesRead < fileLen) {
vga_text += printStr("Read Error: ", vga_text);
printDword(err, vga_text);
kbd_wait();
return;
}
}
uint32_t lastLine;
{
char nl;
uint8_t c = 0x0A; // start with a pretend newline
uint32_t line = -1; // start a pretend line behind
uint32_t lineLen = 0;
for (int32_t o = -1; o < (int32_t)fileLen; lineLen++, c = fileBuffer[++o]) {
// newline
if (c == 0x0A) {
lineOffsets[++line] = o;
lineLengths[line] = lineLen > 0 ? lineLen : 1;
lineLen = 0;
}
// file too large
if (line >= MAXLINES) {
vga_text += printStr("File too large.", vga_text);
kbd_wait();
return;
}
}
lineLengths[line] = lineLen;
lastLine = line;
}
uint32_t currLine = 0;
char cont = 1;
uint32_t screenSize = 80*25;
char redraw = 1;
uint32_t linesOnScreen = 0;
uint32_t cursorLine = 0;
uint32_t cursorLineOffset = 0;
char cursorChange = 0;
for (;cont;) {
if (cursorLine > lastLine) {
cursorLine = lastLine;
cursorLineOffset = lineLengths[lastLine] - 2;
cursorChange = 1;
}
if (lineLengths[cursorLine+1] == 1 && cursorLineOffset == 0){}
else if (cursorLineOffset >= lineLengths[cursorLine+1] - 1) {
cursorLineOffset = 0;
cursorLine++;
cursorChange = 1;
}
if (redraw || cursorChange) {
vga_text = (uint16_t *)0xb8000;
for (int i = 0; i < screenSize; i++)
vga_text[i] = 0x0f00;
char pathBuff[22];
trimPath((char*)path, pathBuff, sizeof(pathBuff));
vga_text += printStr(pathBuff, vga_text);
vga_text += 2;
vga_text += printDec(currLine, vga_text);
vga_text += printChar('/', vga_text);
vga_text += printDec(lastLine, vga_text);
vga_text += printStr(" Scroll: Up/Down PgUp/PgDown Home/End", vga_text);
{
const char prnt[] = "Exit: F1";
vga_text = &((uint16_t*)0xb8000)[80-sizeof(prnt)+1];
vga_text += printStr((char*)prnt, vga_text);
}
for (vga_text = &((uint16_t*)0xb8000)[84]; vga_text < &((uint16_t*)0xb8000)[screenSize]; vga_text += 80)
*(uint8_t*)vga_text = '|';
vga_text = &((uint16_t*)0xb8000)[0];
uint32_t screenLineOff = 6;
uint32_t lineOffset = 0;
uint8_t c = 0x0A; // start with a pretend newline
uint32_t line = currLine - 1; // start a pretend line behind
int32_t o = lineOffsets[currLine]; // the real or fake newline on previous line
linesOnScreen = screenSize/80;
for (; o < (int32_t)fileLen && vga_text < &((uint16_t*)0xb8000)[screenSize]; c = fileBuffer[++o]) {
// newline
if (c == 0x0A) {
vga_text = nextLine(vga_text,(uint16_t*)0xb8000);
line++;
lineOffset = 0;
{
uint16_t *vga_tmp = vga_text;
uint16_t decTmp[11];
char cnt = printDec(line, decTmp);
char off = cnt <= 4 ? 0 : cnt - 4;
vga_tmp += 4 - (cnt - off);
for (int i = off; i < cnt; i++, vga_tmp++)
*(uint8_t*)vga_tmp = (uint8_t)decTmp[i];
}
vga_text += 6;
screenLineOff = 6;
if (cursorLine == line && cursorLineOffset == lineOffset) {
((uint8_t*)vga_text)[1] = 0xf0;
}
continue;
}
*(uint8_t*)vga_text = c;
if (cursorLine == line && cursorLineOffset == lineOffset) {
((uint8_t*)vga_text)[1] = 0xf0;
}
lineOffset++;
vga_text++;
screenLineOff++;
if (screenLineOff == 80) { // last char
vga_text += 6;
screenLineOff = 6;
linesOnScreen--;
}
}
redraw = 0;
}
uint16_t key = get_scancode();
union V86Regs_t regs;
FARPTR v86_entry;
switch (key & 0xff) {
/*case KEY_DOWN: // down
if (currLine < lastLine && lineOffsets[currLine+1] < fileLen) {
currLine++;
redraw = 1;
}
break;
case KEY_UP: // up
if ((currLine > 0 && lineOffsets[currLine-1] < fileLen) || currLine == 1) {
currLine--;
redraw = 1;
}
break;*/
case KEY_DOWN:
cursorLine++;
cursorChange = 1;
break;
case KEY_UP:
if (cursorLine > 0) cursorLine--;
cursorChange = 1;
break;
case KEY_LEFT:
if (cursorLineOffset > 0) cursorLineOffset--;
cursorChange = 1;
break;
case KEY_RIGHT:
cursorLineOffset++;
cursorChange = 1;
break;
case KEY_PGDOWN:
if (currLine+(linesOnScreen/2) <= lastLine && lineOffsets[currLine+(linesOnScreen/2)] < fileLen) {
currLine += (linesOnScreen/2);
redraw = 1;
} else goto end;
break;
case KEY_PGUP:
if (currLine > (linesOnScreen/2) && lineOffsets[currLine-(linesOnScreen/2)] < fileLen) {
currLine -= (linesOnScreen/2);
redraw = 1;
} else if (currLine <= (linesOnScreen/2)) {
currLine = 0;
redraw = 1;
}
break;
case KEY_HOME: home:
if (currLine != 0) {
currLine = 0;
redraw = 1;
}
break;
case KEY_END: end:
if (currLine != lastLine) {
currLine = lastLine;
redraw = 1;
}
break;
case KEY_F1:
cont = 0;
break;
case KEY_F2:
if (screenSize != 80*25) {
SetVideo25Lines();
SetCursorDisabled();
screenSize = 80*25;
redraw = 1;
}
break;
case KEY_F5:
if (screenSize != 80*50) {
SetVideo50Lines();
SetCursorDisabled();
screenSize = 80*50;
redraw = 1;
}
break;
default:
break;
}
}
}