Hello, this is my first post, sorry in advance for any grievances.
I'm playing around with the BareBones tutorial from the wiki to learn, and I've pretty much gotten a keyboard "listener" working, but I'm having trouble with a prompt system I want to implement.
My C/C++ is rusty, but anyways, everything works fine in
getScancode(), it's when I pass the char to
prompt() that it starts being odd. I am trying to make the loop in
prompt() stop when the user hits RETURN. (This also happens if I change the key I want detected to something else) For some reason, the loop doesn't sometimes acknowledge what
input is. Did I do something dumb?
Here is the code:
Code:
// I have omitted the terminal.h because it's mostly irrelevant for this, and it works like it should
#if !defined(__cplusplus)
#include <stdbool.h> /* C doesn't have booleans by default. */
#endif
#include <stddef.h>
#include <stdint.h>
#include "terminal.h"
#if defined(__linux__)
#error "You are not using a cross-compiler, you will most certainly run into trouble"
#endif
#if !defined(__i386__)
#error "This needs to be compiled with a ix86-elf compiler"
#endif
unsigned char keyset[128] = {
0, 27, '1', '2', '3', '4', '5', '6', '7', '8', /* 9 */
'9', '0', '-', '=', '\b', /* Backspace */
'\t', /* Tab */
'q', 'w', 'e', 'r', /* 19 */
't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n', /* Enter key */
0, /* 29 - Control */
'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', /* 39 */
'\'', '`', 0, /* Left shift */
'\\', 'z', 'x', 'c', 'v', 'b', 'n', /* 49 */
'm', ',', '.', '/', 0, /* Right shift */
'*',
0, /* Alt */
' ', /* Space bar */
0, /* Caps lock */
0, /* 59 - F1 key ... > */
0, 0, 0, 0, 0, 0, 0, 0,
0, /* < ... F10 */
0, /* 69 - Num lock*/
0, /* Scroll Lock */
0, /* Home key */
0, /* Up Arrow */
0, /* Page Up */
'-',
0, /* Left Arrow */
0,
0, /* Right Arrow */
'+',
0, /* 79 - End key*/
0, /* Down Arrow */
0, /* Page Down */
0, /* Insert Key */
0, /* Delete Key */
0, 0, 0,
0, /* F11 Key */
0, /* F12 Key */
0, /* All other keys are undefined */
};
#if defined(__cplusplus)
extern "C" { /* Use C linkage for kernel_main. */
#endif
static inline void outb(uint16_t port, uint8_t val) {
asm volatile ( "outb %0, %1" : : "a"(val), "Nd"(port) );
}
static inline uint8_t inb(uint16_t port) {
uint8_t ret;
asm volatile ( "inb %1, %0"
: "=a"(ret)
: "Nd"(port) );
return ret;
}
// initialize the terminal
Terminal term;
char last = 0;
char getScancode() {
char c=0;
if(inb(0x60)!=c) {
c=inb(0x60);
if (c!= last) {
last = c;
if (c>0) {
if (keyset[c] == '\n') {
term.WriteString("(Enter Pressed)");
} else {
term.PutChar(keyset[c]);
}
return keyset[c];
}
}
}
}
void prompt() {
term.PutChar('>');
char input=0;
while (input != '\n'){
if (getScancode()) {
input = getScancode();
}
}
term.PutChar('\n');
}
void kernel_main(void) {
/* Initialize terminal interface */
term.Initialize();
/* Newline support is left as an exercise. */
term.WriteString("|Ready!\n");
while(true)
prompt();
}
}
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