From: Duje Mihanović <duje.mihanovic@skole.hr>
Date: Fri, 13 May 2022 18:19:23 +0000 (+0200)
Subject: Add ability to print numbers in decimal
X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/%7B%7B?a=commitdiff_plain;h=49dc1d078bb1a5530e452aa800c8871c18808340;p=nameless-os.git

Add ability to print numbers in decimal
---

diff --git a/Makefile b/Makefile
index aee8cc1..f5a33b6 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ QEMU = qemu-system-i386 -monitor stdio
 
 export GIT_REV = $(shell git describe --long HEAD)
 
-CFLAGS = -std=gnu89 -g -Iinclude/arch/x86 -ffreestanding -DGIT_COMMIT=\"$(GIT_REV)\"
+CFLAGS = -std=gnu99 -g -Iinclude/arch/x86 -ffreestanding -DGIT_COMMIT=\"$(GIT_REV)\"
 
 KERNEL_OBJ = kernel/entry.o kernel/arch/x86/tty/tty.o kernel/drivers/irq/i8259a.o kernel/arch/x86/irq/idt.o kernel/arch/x86/irq/sample_handler.o kernel/kernel.o
 BOOTLOADER_OBJ = boot/x86/mbr boot/x86/vbr-fat32 boot/x86/stage3/LOADER.BIN
@@ -18,6 +18,9 @@ bootloader: $(BOOTLOADER_OBJ)
 run: all
 	$(QEMU) boot/x86/disk.img
 
+debug: all
+	$(QEMU) -s -S boot/x86/disk.img
+
 boot/x86/mbr: boot/x86/mbr.s
 boot/x86/vbr-fat32: boot/x86/vbr-fat32.s boot/x86/fat32/*.s 
 boot/x86/stage3/LOADER.BIN: boot/x86/stage3/*.s boot/x86/fat32/*.s
@@ -52,4 +55,4 @@ clean:
 	-rm kernel/kernel.{bin,dbg,elf} ${KERNEL_OBJ}
 	cd boot/x86 && $(MAKE) clean
 
-.PHONY: default all clean run bootloader
+.PHONY: default all clean run debug bootloader
diff --git a/include/arch/x86/tty.h b/include/arch/x86/tty.h
index 2224737..42857ac 100644
--- a/include/arch/x86/tty.h
+++ b/include/arch/x86/tty.h
@@ -25,4 +25,5 @@ extern void kprint(const char *string, uint8_t color);
 extern void kprintb(const uint8_t byte);
 extern void kprintw(const uint16_t word);
 extern void kprintd(const uint32_t dword);
+extern int kprintdec(uint32_t num);
 #endif
diff --git a/kernel/arch/x86/tty/tty.c b/kernel/arch/x86/tty/tty.c
index 07d734e..51686a3 100644
--- a/kernel/arch/x86/tty/tty.c
+++ b/kernel/arch/x86/tty/tty.c
@@ -137,3 +137,38 @@ void kprintd(uint32_t dword)
 	temp = dword & 0xF;
 	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
 }
+
+int kprintdec(uint32_t num)
+{
+	char buffer[11];
+	int digits = 10;
+	/* TODO: make an actual memset function to use instead of this */
+	for (int i=0; i<11; i++) {
+		buffer[i] = 0;
+	}
+
+	/* put the numbers in the buffer */
+	for (int i=9; i>0 && num>0; i--) {
+		uint8_t currdigit = num%10;
+		buffer[i] = currdigit+'0';
+		num /= 10;
+	}
+
+	/* shift the array as much as needed */
+	while (*buffer == '\0') {
+		digits--;
+		for (int i=0; i<9; i++) {
+			buffer[i] = buffer[i+1];
+		}
+	}
+
+	/* zero out any leftovers */
+	if (digits < 10) {
+		for (int i=digits; i<10; i++) {
+			buffer[i] = '\0';
+		}
+	}
+
+	kprint(buffer, 0);
+	return digits;
+}
diff --git a/kernel/kernel.c b/kernel/kernel.c
index 4c6efd8..24deeb9 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -27,5 +27,9 @@ void kmain(void)
 	pic_unmask(1);
 	asm volatile ("sti");
 	kprint("All done\n", 0);
+	kprintdec(12345);
+	kprintc('\n');
+	kprintdec(6789);
+	kprintc('\n');
 	while(1);
 }