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luciaos/progs.c
Lucia Ceionia 89c0f95219 Hex viewer is now a hex editor!
2023-02-09 23:32:51 -06:00

688 lines
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#include "progs.h"
#include "helper.h"
#include "kbd.h"
void HexViewTest(uint8_t *path, VOLINFO *vi) {
uint32_t err;
uint16_t *vga_text = (uint16_t *)0xb8000;
uint32_t screenSize = 80*25;
uint8_t *scratch = (uint8_t *)0x20000;
const uint32_t blockSize = 0x10000; // 64K
const uint32_t blockMask = ~0xffff; // block = (offset & blockMask)
const uint32_t blockShift = 16; // blockSize = 1 << blockShift
const uint32_t maxFileSize = 0x80000000; // 2GB
const uint32_t totalBlocks = maxFileSize / blockSize;
// TODO This hackish code means we should really be loading these
// programs rather than having them all be in the kernel itself
uint16_t (*writtenMap)[totalBlocks] =
(uint16_t (*)[totalBlocks])0x400000;
uint32_t (*blockLenMap)[totalBlocks] =
(uint32_t (*)[totalBlocks])((uintptr_t)writtenMap + sizeof(*writtenMap));
uint8_t (*writeStore)[blockSize] =
(uint8_t (*)[blockSize])((uintptr_t)blockLenMap + sizeof(*blockLenMap));
for (int i = 0; i < totalBlocks; i++)
(*writtenMap)[i] = 0;
uint8_t *screenBuff = *writeStore;
// First two blocks are screen buffer
uint32_t nextFreeBlock = 2;
FILEINFO fi;
vga_text = (uint16_t *)0xb8000;
for (int i = 0; i < 80*50; i++)
vga_text[i] = 0x0f00;
err = DFS_OpenFile(vi, path, DFS_READ | DFS_WRITE, scratch, &fi);
if (err) {
vga_text += printStr("Open Error: ", vga_text);
printDword(err, vga_text);
kbd_wait();
return;
}
if (fi.filelen == 0) {
vga_text += printStr("File ", vga_text);
vga_text += printStr((char*)path, vga_text);
vga_text += printStr(" has no data.", vga_text);
kbd_wait();
return;
}
if (fi.filelen > maxFileSize) {
vga_text += printStr("File ", vga_text);
vga_text += printStr((char*)path, vga_text);
vga_text += printStr(" is too large (> 2GB).", vga_text);
kbd_wait();
return;
}
uint32_t drawOffset = 0, lastDrawOffset = -1;
char cont = 1;
uint32_t byteCount = 16*24, lastByteCount = 0;
// Cursor offset from *drawOff*
int32_t cursorScreenOff = 0, lastCursorScreenOff = -1;
// Pointer to last cursor in *VGA mem*
uint8_t *lastCursorScreenPtr = (uint8_t*)0xb8000;
char cursorNibble = 1, lastCursorNibble = 0;
char cursorRedraw = 1;
char reread = 1, redraw = 1;
uint8_t *currBuff = 0, *nextBuff = 0;
uint32_t currBuffLength, nextBuffLength, totalBuffLength;
uint16_t currLoadedBlock = -1, nextLoadedBlock = -1;
char currInMap = 0, nextInMap = 0;
uint32_t changeOffset = -1, lastChangeOffset = -1;
char fileChanged = 0;
for (;cont;) {
// Check if we need to scroll screen for cursor
// Should never be more than 16 away, if it is,
// things will be caught by sanity checks.
// Scroll Back
if (cursorScreenOff < 0) {
if (drawOffset - 16 < fi.filelen)
drawOffset -= 16;
cursorScreenOff += 16;
}
// Scroll Forward
if (cursorScreenOff >= byteCount) {
if (drawOffset + 16 < fi.filelen)
drawOffset += 16;
cursorScreenOff -= 16;
}
// Sanity checks
if (cursorScreenOff >= byteCount)
cursorScreenOff = byteCount - 1;
if (cursorScreenOff + drawOffset >= fi.filelen)
cursorScreenOff = fi.filelen - drawOffset - 1;
if (cursorScreenOff < 0) cursorScreenOff = 0;
if (cursorNibble != lastCursorNibble)
cursorRedraw = 1;
if (cursorScreenOff != lastCursorScreenOff)
cursorRedraw = 1;
if (cursorRedraw) {
const uint32_t hexViewScreenOff = 10 * 2;
const uint32_t asciiViewScreenOff = 61 * 2;
uint16_t *screen = (uint16_t*)0xb8000;
// Byte draw starts on first line
uint16_t *line = &screen[80 * (1 + (cursorScreenOff >> 4))];
uint8_t *cursorPtr = (uint8_t*)line;
if (cursorNibble == 0) {
// Each byte takes 3 chars on screen
cursorPtr += hexViewScreenOff + (cursorScreenOff & 0xF) * 3 * 2;
if ((cursorScreenOff & 0xF) > 7)
cursorPtr += 2;
// Low nibble
cursorPtr += 2;
} else if (cursorNibble == 1) {
// Each byte takes 3 chars on screen
cursorPtr += hexViewScreenOff + (cursorScreenOff & 0xF) * 3 * 2;
if ((cursorScreenOff & 0xF) > 7)
cursorPtr += 2;
// ASCII area
} else {
// Each byte takes 1 char on screen
cursorPtr += asciiViewScreenOff + (cursorScreenOff & 0xF) * 2;
}
// We want the color byte, not char
cursorPtr++;
if (cursorPtr != lastCursorScreenPtr) {
*lastCursorScreenPtr = 0x0f;
*cursorPtr = 0xf0;
lastCursorScreenPtr = cursorPtr;
}
lastCursorScreenOff = cursorScreenOff;
lastCursorNibble = cursorNibble;
cursorRedraw = 0;
}
if ((drawOffset & blockMask) != (lastDrawOffset & blockMask)) {
lastDrawOffset = (drawOffset & blockMask);
reread = 1;
redraw = 1;
}
if (drawOffset != lastDrawOffset) {
lastDrawOffset = drawOffset;
redraw = 1;
}
if (byteCount != lastByteCount) {
lastByteCount = byteCount;
redraw = 1;
}
if (changeOffset != lastChangeOffset) {
redraw = 1;
lastChangeOffset = changeOffset;
}
// Check for changes to block
if (changeOffset != -1) {
char isCurr = changeOffset < blockSize;
char changeInMap = isCurr ? currInMap : nextInMap;
uint8_t *changedBlock = isCurr ? currBuff : nextBuff;
// If changes are in map we don't need to do anything
if (!changeInMap) {
uint16_t loadedBlock = isCurr ? currLoadedBlock : nextLoadedBlock;
uint16_t storeBlockIdx = (*writtenMap)[loadedBlock];
// Add a new map entry
if (!storeBlockIdx) {
(*writtenMap)[loadedBlock] = storeBlockIdx = nextFreeBlock++;
(*blockLenMap)[loadedBlock] = isCurr ? currBuffLength : nextBuffLength;
}
uint8_t *storeBlock = writeStore[storeBlockIdx];
for (int i = 0; i < blockSize; i++)
storeBlock[i] = changedBlock[i];
// Move the current buffer to map
if (isCurr) { currBuff = storeBlock; currInMap = 1; }
else { nextBuff = storeBlock; nextInMap = 1; }
}
changeOffset = -1;
fileChanged = 1;
redraw = 1;
}
if (reread) {
// TODO We should probably check if we already have
// the block to read in nextBuff from previous stuff
// We are in a modified block
uint16_t newBlock = drawOffset >> blockShift;
if ((*writtenMap)[newBlock]) {
currBuff = writeStore[(*writtenMap)[newBlock]];
currBuffLength = (*blockLenMap)[newBlock];
totalBuffLength = currBuffLength;
currInMap = 1;
// We are in an unmodified block
} else {
uint32_t blockOffset = drawOffset & blockMask;
vga_text = &((uint16_t*)0xb8000)[80];
DFS_Seek(&fi, blockOffset, scratch);
if (fi.pointer != blockOffset) {
vga_text += printStr("Seek Error", vga_text);
kbd_wait();
return;
}
err = DFS_ReadFile(&fi, scratch, screenBuff, &currBuffLength, blockSize);
if (err && err != DFS_EOF) {
vga_text += printStr("Read Error: ", vga_text);
printDword(err, vga_text);
kbd_wait();
return;
}
currBuff = screenBuff;
totalBuffLength = currBuffLength;
currInMap = 0;
}
currLoadedBlock = newBlock;
reread = 0;
nextInMap = 0;
}
// We will be drawing stuff in the next block
// TODO This would be better served with nice functions!
if (currBuffLength == blockSize && (drawOffset & ~blockMask) > (blockSize - byteCount)) {
// TODO We should probably check if we already have
// the next block in currBuff from previous stuff
// Next is a modified block
uint16_t newBlock = (drawOffset >> blockShift) + 1;
if (nextLoadedBlock != newBlock) {
if ((*writtenMap)[newBlock]) {
nextBuffLength = (*blockLenMap)[newBlock];
nextBuff = writeStore[(*writtenMap)[newBlock]];
nextInMap = 1;
// Next is an unmodified block
} else {
uint32_t blockOffset = (drawOffset & blockMask) + blockSize;
vga_text = &((uint16_t*)0xb8000)[80];
DFS_Seek(&fi, blockOffset, scratch);
if (fi.pointer != blockOffset) {
vga_text += printStr("Seek Error", vga_text);
kbd_wait();
return;
}
err = DFS_ReadFile(&fi, scratch, &screenBuff[blockSize], &nextBuffLength, blockSize);
if (err && err != DFS_EOF) {
vga_text += printStr("Read Error: ", vga_text);
printDword(err, vga_text);
kbd_wait();
return;
}
nextBuff = &screenBuff[blockSize];
nextInMap = 0;
}
nextLoadedBlock = newBlock;
}
totalBuffLength = currBuffLength + nextBuffLength;
}
if (redraw) {
vga_text = (uint16_t *)0xb8000;
vga_text += printStr((char*)path, vga_text);
vga_text += printChar(fileChanged ? '*' : ' ', vga_text);
{
const char prnt[] = "Scroll: Up/Down PgUp/PgDown Home/End Exit: F1";
vga_text = &((uint16_t*)0xb8000)[80-sizeof(prnt)];
vga_text += printStr((char*)prnt, vga_text);
}
vga_text = &((uint16_t*)0xb8000)[80];
uint32_t offsetInBuff = drawOffset & ~blockMask;
uint8_t *drawFromBuff = &currBuff[offsetInBuff];
uint32_t maxDrawLen = totalBuffLength - (drawOffset & ~blockMask);
for (int i = 0; i < maxDrawLen && i < byteCount; i += 16) {
// Blocks are blockSize aligned, so 16-byte alignment should work
if (i + offsetInBuff >= blockSize) {
drawFromBuff = &nextBuff[-i];
offsetInBuff = 0;
}
vga_text += printDword(i + drawOffset, vga_text);
vga_text += printChar(' ', vga_text);
vga_text += printChar(' ', vga_text);
for (uint32_t j = 0; j < 16; j++) {
if (i + j < maxDrawLen)
vga_text += printByte(drawFromBuff[i + j], vga_text);
else {
vga_text += printChar(' ', vga_text);
vga_text += printChar(' ', vga_text);
}
vga_text += printChar(' ', vga_text);
if (j == 7)
vga_text += printChar(' ', vga_text);
}
vga_text += printChar(' ', vga_text);
vga_text += printChar('|', vga_text);
for (uint32_t j = 0; j < 16; j++) {
if (i + j < maxDrawLen)
vga_text += printChar(drawFromBuff[i + j], vga_text);
else vga_text += printChar(' ', vga_text);
}
vga_text += printChar('|', vga_text);
vga_text = nextLine(vga_text);
}
// Clear remainder of screen
for (;vga_text < &((uint16_t*)0xb8000)[screenSize]; vga_text++)
*vga_text = 0x0f00;
redraw = 0;
}
uint16_t key = get_scancode();
union V86Regs_t regs;
FARPTR v86_entry;
char try_edit = 0;
switch (key & 0xff) {
case KEY_DOWN:
// Stay in file
if ((cursorScreenOff + 16 + drawOffset) < fi.filelen)
cursorScreenOff += 16;
break;
case KEY_UP:
// Stay in file
if ((uint32_t)(cursorScreenOff - 16 + drawOffset) < fi.filelen)
cursorScreenOff -= 16;
break;
case KEY_LEFT:
if (cursorNibble == 0) { cursorNibble = 1; break; }
// Exiting text area
else if (cursorNibble == 2 && (cursorScreenOff & 0xF) == 0) {
cursorNibble = 0;
cursorScreenOff |= 0xF;
// Stay in file
} else if ((cursorScreenOff - 1 + drawOffset) < fi.filelen) {
cursorScreenOff--;
if (cursorNibble == 1) cursorNibble = 0;
}
break;
case KEY_RIGHT:
if (cursorNibble == 1) { cursorNibble = 0; break; }
// Entering text area
else if (cursorNibble == 0 && (cursorScreenOff & 0xF) == 0xF) {
cursorNibble = 2;
cursorScreenOff &= ~0xF;
// Stay in file
} else if ((cursorScreenOff + 1 + drawOffset) < fi.filelen) {
cursorScreenOff++;
if (cursorNibble == 0) cursorNibble = 1;
}
break;
case KEY_PGDOWN:
if (drawOffset + byteCount < fi.filelen)
drawOffset += byteCount;
else if ((fi.filelen / byteCount) * byteCount > drawOffset)
drawOffset = (fi.filelen / byteCount) * byteCount;
break;
case KEY_PGUP:
if (drawOffset - byteCount < fi.filelen)
drawOffset -= byteCount;
else drawOffset = 0;
break;
case KEY_HOME:
cursorScreenOff &= ~0xF;
if (cursorNibble == 0) cursorNibble = 1;
break;
case KEY_END:
cursorScreenOff |= 0xF;
if (cursorNibble == 1) cursorNibble = 0;
break;
case KEY_F1:
cont = 0;
break;
case KEY_F3: // start of file
drawOffset = 0;
break;
case KEY_F4: // end of file
if ((fi.filelen / byteCount) * byteCount > drawOffset)
drawOffset = (fi.filelen / byteCount) * byteCount;
break;
case KEY_F6: // TODO write file
break;
case KEY_F2:
if (byteCount != 16*24) {
SetVideo25Lines();
SetCursorDisabled();
screenSize = 80*25;
byteCount = 16*24;
}
break;
case KEY_F5:
if (byteCount != 16*49) {
SetVideo50Lines();
SetCursorDisabled();
screenSize = 80*50;
byteCount = 16*49;
}
break;
default:
try_edit = 1;
break;
}
if (!try_edit) continue;
// Check if in range
char k = key >> 8; // ASCII portion
char v;
if (cursorNibble == 2 && k >= 0x20 && k <= 0x7E) v = k;
else if (k >= '0' && k <= '9')
v = k - '0';
else if (k >= 'a' && k <= 'f')
v = k - 'a' + 0xA;
else if (k >= 'A' && k <= 'F')
v = k - 'A' + 0xA;
else continue;
// Change buffer at cursor
uint32_t screenOffsetInBuff = drawOffset & ~blockMask;
changeOffset = screenOffsetInBuff + cursorScreenOff;
char isCurr = changeOffset < blockSize;
uint8_t *changeBuff = isCurr ? currBuff : nextBuff;
uint32_t changeOffsetInBuff = isCurr ? changeOffset : changeOffset - blockSize;
if (cursorNibble == 0)
changeBuff[changeOffsetInBuff] = (changeBuff[changeOffsetInBuff] & 0xF0) | v;
else if (cursorNibble == 1)
changeBuff[changeOffsetInBuff] = (changeBuff[changeOffsetInBuff] & 0x0F) | (v << 4);
else changeBuff[changeOffsetInBuff] = v;
redraw = 1;
}
if (!fileChanged) return;
vga_text = (uint16_t*)0xb8000;
vga_text += printStr((char*)path, vga_text);
vga_text += printChar(fileChanged ? '*' : ' ', vga_text);
vga_text += printChar(' ', vga_text);
vga_text += printStr("Save changes to file? (Y/N)", vga_text);
for (;vga_text < &((uint16_t*)0xb8000)[80];vga_text++)
*vga_text = 0x0f00;
uint16_t key=0;
for(;(key & 0xff) != KEY_N && (key & 0xff) != KEY_Y;key = get_scancode());
if ((key & 0xff) != KEY_Y) return;
// Write changes
for (int i = 0; i < totalBlocks && (i << blockShift) < fi.filelen; i++) {
// No change in current block
uint16_t blockIdx = (*writtenMap)[i];
uint32_t blockLen = (*blockLenMap)[i];
if (!blockIdx) continue;
// Write block to file
uint32_t successcount;
uint32_t blockOff = i << blockShift;
DFS_Seek(&fi, blockOff, scratch);
if (fi.pointer != blockOff) {
vga_text = (uint16_t*)0xb8000;
vga_text += printStr("Seek Error ", vga_text);
kbd_wait();
return;
}
uint32_t err = DFS_WriteFile(&fi, scratch, writeStore[blockIdx], &successcount, blockLen);
if (successcount < blockLen || err) {
vga_text = (uint16_t*)0xb8000;
vga_text += printStr("Write Error ", vga_text);
kbd_wait();
return;
}
}
}
void TextViewTest(uint8_t *path, VOLINFO *vi) {
uint16_t *vga_text = (uint16_t *)0xb8000;
uint32_t fileLen;
uint8_t *diskReadBuf = (uint8_t *)0x500000;
{
uint32_t err;
uint8_t *scratch = (uint8_t *)0x20000;
FILEINFO fi;
err = DFS_OpenFile(vi, path, DFS_READ, scratch, &fi);
if (err) {
vga_text += printStr("Open Error: ", vga_text);
printDword(err, vga_text);
return;
}
// file too large
if (fi.filelen > 0x300000) {
vga_text += printStr("File too large.", vga_text);
kbd_wait();
return;
}
DFS_Seek(&fi, 0, scratch);
if (fi.pointer != 0) {
vga_text += printStr("Seek Error", vga_text);
return;
}
err = DFS_ReadFile(&fi, scratch, diskReadBuf, &fileLen, fi.filelen);
if (err && err != DFS_EOF) {
vga_text += printStr("Read Error: ", vga_text);
printDword(err, vga_text);
return;
}
}
uint32_t *lineOffsets = (uint32_t *)0x400000;
uint32_t lastLine;
{
char nl;
uint8_t c = 0x0A; // start with a pretend newline
uint32_t line = -1; // start a pretend line behind
for (int32_t o = -1; o < (int32_t)fileLen; c = diskReadBuf[++o]) {
// newline
if (c == 0x0A) {
lineOffsets[++line] = o;
}
// file too large
if ((uintptr_t)&lineOffsets[line] >= 0x4FFFFC) {
vga_text += printStr("File too large.", vga_text);
kbd_wait();
return;
}
}
lastLine = line;
}
uint32_t currLine = 0;
char cont = 1;
uint32_t screenSize = 80*25;
char redraw = 1;
uint32_t linesOnScreen = 0;
for (;cont;) {
if (redraw) {
vga_text = (uint16_t *)0xb8000;
for (int i = 0; i < screenSize; i++)
vga_text[i] = 0x0f00;
vga_text += printStr((char*)path, vga_text);
vga_text += 2;
vga_text += printStr("Line: ", vga_text);
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: E ";
vga_text = &((uint16_t*)0xb8000)[80-sizeof(prnt)];
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 lineOff = 6;
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 = diskReadBuf[++o]) {
// newline
if (c == 0x0A) {
vga_text = nextLine(vga_text);
line++;
{
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;
lineOff = 6;
continue;
}
*(uint8_t*)vga_text = c;
vga_text++;
lineOff++;
if (lineOff == 80) { // last char
vga_text += 6;
lineOff = 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_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_E: // e
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;
}
}
}
// 400000 - 700000 Usermode Code (3mB)
// 700000 - 800000 Usermode Stack (1mB)
extern uint32_t create_user_child(uint32_t esp, uint32_t eip, uint32_t argc, ...);
void ProgramLoadTest(uint8_t *path, VOLINFO *vi) {
uint16_t *vga_text = (uint16_t *)0xb8000;
for (int i = 0; i < 80*25; i++)
vga_text[i] = 0x0f00;
uint32_t successcount;
uint8_t *diskReadBuf = (uint8_t *)0x400000;
{
uint32_t err;
uint8_t *scratch = (uint8_t *)0x20000;
FILEINFO fi;
err = DFS_OpenFile(vi, path, DFS_READ, scratch, &fi);
if (err) {
vga_text += printStr("Open Error: ", vga_text);
printDword(err, vga_text);
return;
}
if (fi.filelen > 0x300000) {
vga_text += printStr("File too large.", vga_text);
kbd_wait();
return;
}
DFS_Seek(&fi, 0, scratch);
if (fi.pointer != 0) {
vga_text += printStr("Seek Error", vga_text);
return;
}
err = DFS_ReadFile(&fi, scratch, diskReadBuf, &successcount, fi.filelen);
if (err && err != DFS_EOF) {
vga_text += printStr("Read Error: ", vga_text);
printDword(err, vga_text);
return;
}
if (successcount < fi.filelen) {
vga_text += printStr("Could not read all file bytes.", vga_text);
return;
}
}
vga_text += printStr("Successfully loaded program \"", vga_text);
vga_text += printStr((char*)path, vga_text);
vga_text += printStr("\", ", vga_text);
vga_text += printDec(successcount, vga_text);
vga_text += printStr(" Bytes.", vga_text);
vga_text = nextLine(vga_text);
vga_text += printStr("Press any key to run.", vga_text);
kbd_wait();
uint32_t res = create_user_child(0x800000, 0x400000, 0);
union V86Regs_t regs;
regs.w.ax = 3; // text mode
V8086Int(0x10, &regs);
vga_text = (uint16_t *)0xb8000;
for (int i = 0; i < 80*25; i++)
vga_text[i] = 0x0f00;
vga_text += printStr("Program returned code: ", vga_text);
vga_text += printDec(res, vga_text);
vga_text += printStr(" (0x", vga_text);
vga_text += printDword(res, vga_text);
vga_text += printStr("). Press any key to exit.", vga_text);
kbd_wait();
}
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