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Added newline and scroll support to the VGA driver.

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This commit is contained in:
L. Bradley LaBoon 2013-10-16 15:55:37 -04:00
parent 61b351b3b3
commit 028ea93acf
1 changed files with 25 additions and 4 deletions
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27
kernel/brados.c
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@ -1,4 +1,3 @@
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
@ -80,13 +79,35 @@ void terminalPutEntryAt(char c, uint8_t color, size_t x, size_t y)
terminalBuf[index] = makeVGAEntry(c, color);
}
void terminalScroll()
{
for (size_t i = 1; i < VGA_HEIGHT; i++) {
for (size_t j = 0; j < VGA_WIDTH; j++) {
const size_t index = i * VGA_WIDTH + j;
const size_t indexBelow = (i - 1) * VGA_WIDTH + j;
terminalBuf[indexBelow] = terminalBuf[index];
}
}
for (size_t i = 0; i < VGA_WIDTH; i++) {
const size_t index = (VGA_HEIGHT - 1) * VGA_WIDTH + i;
terminalBuf[index] = ' ';
}
}
void terminalPutChar(char c)
{
if (c == '\n')
terminalCol = VGA_WIDTH - 1;
else
terminalPutEntryAt(c, terminalColor, terminalCol, terminalRow);
if (terminalCol++ == VGA_WIDTH) {
terminalCol = 0;
if (terminalRow++ == VGA_HEIGHT)
terminalRow = 0;
if (terminalRow++ == VGA_HEIGHT) {
terminalRow--;
terminalScroll();
}
}
}