From: Duje Mihanović <duje.mihanovic@skole.hr>
Date: Wed, 29 Jun 2022 09:01:23 +0000 (+0200)
Subject: kernel: tty: Use recursion in byte/word printing
X-Git-Url: http://git.dujemihanovic.xyz/%22/icons/right.gif/static/git-logo.png?a=commitdiff_plain;h=1134d10715ddb0d9f1d36275b7c909189424035c;p=nameless-os.git

kernel: tty: Use recursion in byte/word printing
---

diff --git a/kernel/arch/x86/irq/interrupt.c b/kernel/arch/x86/irq/interrupt.c
index f7cbcdc..5c448fe 100644
--- a/kernel/arch/x86/irq/interrupt.c
+++ b/kernel/arch/x86/irq/interrupt.c
@@ -12,13 +12,13 @@ void int_handler(struct interrupt_frame *frame)
 	int interrupt = frame->interrupt;
 	if (int_handler_table[interrupt] == NULL) {
 		kprint("WARNING: Unhandled interrupt ", 0);
-		kprintb(interrupt);
+		kprintb(interrupt, 1);
 		kprint(" occurred!\n", 0);
 	} else {
 		int ret = (*int_handler_table[interrupt])(frame);
 		if (ret) {
 			kprint("WARNING: Error while handling interrupt ", 0);
-			kprintb(interrupt);
+			kprintb(interrupt, 1);
 			kprint("!\n", 0);
 		}
 	}
diff --git a/kernel/arch/x86/tty/tty.c b/kernel/arch/x86/tty/tty.c
index c55cdd4..ca3212a 100644
--- a/kernel/arch/x86/tty/tty.c
+++ b/kernel/arch/x86/tty/tty.c
@@ -92,88 +92,48 @@ void kprintc(const char character, uint8_t color)
 
 }
 
-void kprintb(uint8_t byte)
+void kprintnibble(uint8_t nibble)
 {
-	uint8_t temp;
-	temp = byte >> 4;
-	kprint("0x", VGA_COLOR_LIGHT_GRAY);
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = byte & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
+	nibble &= 0xf;
+	if (nibble < 0xa)
+		kprintc('0' + nibble, 0);
+	else kprintc('a' - 0xa + nibble, 0);
 }
 
-void kprintw(uint16_t word)
+void kprintb(uint8_t byte, int print_delm)
 {
-	uint8_t temp;
-	temp = word >> 12;
-	kprint("0x", VGA_COLOR_LIGHT_GRAY);
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (word >> 8) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (word >> 4) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = word & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
+	if (print_delm)
+		kprint("0x", 0);
+
+	kprintnibble(byte >> 4);
+	kprintnibble(byte);
 }
 
-void kprintd(uint32_t dword)
+void kprintw(uint16_t word, int print_delm)
 {
-	uint8_t temp;
-	temp = dword >> 28;
-	kprint("0x", VGA_COLOR_LIGHT_GRAY);
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (dword >> 24) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (dword >> 20) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (dword >> 16) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (dword >> 12) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (dword >> 8) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (dword >> 4) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = dword & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
+	if (print_delm)
+		kprint("0x", 0);
+
+	kprintb(word >> 8, 0);
+	kprintb(word, 0);
 }
 
-void kprintq(uint64_t qword)
+void kprintd(uint32_t dword, int print_delm)
 {
-	uint8_t temp;
-	temp = qword >> 60;
-	kprint("0x", VGA_COLOR_LIGHT_GRAY);
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 56) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 52) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 48) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 44) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 40) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 36) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 32) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 28) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 24) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 20) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 16) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 12) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 8) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = (qword >> 4) & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
-	temp = qword & 0xF;
-	kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
+	if (print_delm)
+		kprint("0x", 0);
+
+	kprintw(dword >> 16, 0);
+	kprintw(dword, 0);
+}
+
+void kprintq(uint64_t qword, int print_delm)
+{
+	if (print_delm)
+		kprint("0x", 0);
+
+	kprintd(qword >> 32, 0);
+	kprintd(qword, 0);
 }
 
 int kprintdec(uint32_t num, uint8_t color)
diff --git a/kernel/include/tty.h b/kernel/include/tty.h
index 3e1aab0..87aad81 100644
--- a/kernel/include/tty.h
+++ b/kernel/include/tty.h
@@ -23,9 +23,9 @@
 extern void screen_clear(void);
 extern void kprint(const char *string, uint8_t color);
 extern void kprintc(const char character, 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 void kprintq(const uint64_t qword);
+extern void kprintb(uint8_t byte, int print_delm);
+extern void kprintw(uint16_t word, int print_delm);
+extern void kprintd(uint32_t dword, int print_delm);
+extern void kprintq(uint64_t qword, int print_delm);
 extern int kprintdec(uint32_t num, uint8_t color);
 #endif
diff --git a/kernel/kernel.c b/kernel/kernel.c
index adfdd3f..cd3e228 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -23,13 +23,13 @@ void print_e820(struct e820_map *mmap, int mmap_size)
 	kprint("       Base       |      Length      |   Type   |  Attrib  |\n", 0);
 	kprint("------------------------------------------------------------\n", 0);
 	for (int i=0; i<mmap_size; i++) {
-		kprintq(mmap[i].base);
+		kprintq(mmap[i].base, 1);
 		kprintc('|', 0);
-		kprintq(mmap[i].length);
+		kprintq(mmap[i].length, 1);
 		kprintc('|', 0);
-		kprintd(mmap[i].type);
+		kprintd(mmap[i].type, 1);
 		kprintc('|', 0);
-		kprintd(mmap[i].attrib);
+		kprintd(mmap[i].attrib, 1);
 		kprintc('|', 0);
 		kprintc('\n', 0);
 	}
@@ -40,34 +40,34 @@ int double_fault_handler(struct interrupt_frame *frame)
 {
 	kprint("Double fault occurred!\n", VGA_COLOR_BRIGHT_RED);
 	kprint("EAX: ", 0);
-	kprintd(frame->eax);
+	kprintd(frame->eax, 1);
 	kprintc(' ', 0);
 	kprint("EBX: ", 0);
-	kprintd(frame->ebx);
+	kprintd(frame->ebx, 1);
 	kprintc(' ', 0);
 	kprint("ECX: ", 0);
-	kprintd(frame->ecx);
+	kprintd(frame->ecx, 1);
 	kprintc(' ', 0);
 	kprint("EDX: ", 0);
-	kprintd(frame->edx);
+	kprintd(frame->edx, 1);
 	kprintc('\n', 0);
 	kprint("EBP: ", 0);
-	kprintd(frame->ebp);
+	kprintd(frame->ebp, 1);
 	kprintc(' ', 0);
 	kprint("ESP: ", 0);
-	kprintd(frame->esp);
+	kprintd(frame->esp, 1);
 	kprintc('\n', 0);
 	kprint("ESI: ", 0);
-	kprintd(frame->esi);
+	kprintd(frame->esi, 1);
 	kprintc(' ', 0);
 	kprint("EDI: ", 0);
-	kprintd(frame->edi);
+	kprintd(frame->edi, 1);
 	kprintc('\n', 0);
 	kprint("EIP: ", 0);
-	kprintd(frame->eip);
+	kprintd(frame->eip, 1);
 	kprintc(' ', 0);
 	kprint("EFLAGS: ", 0);
-	kprintd(frame->eflags);
+	kprintd(frame->eflags, 1);
 	kprintc('\n', 0);
 	PANIC("double fault");
 }