From 1ed4b5788204ebbbde9b8b089b2991de7563a353 Mon Sep 17 00:00:00 2001
From: Imbus <>
Date: Wed, 1 Oct 2025 02:48:32 +0200
Subject: [PATCH] hexdump.[ch]: utility function for dumping memory regions as
 hex

---
 Makefile               |  3 ++-
 kern/libkern/hexdump.c | 34 ++++++++++++++++++++++++++++++++++
 kern/libkern/hexdump.h |  8 ++++++++
 3 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 kern/libkern/hexdump.c
 create mode 100644 kern/libkern/hexdump.h

diff --git a/Makefile b/Makefile
index 29aa115..5622f00 100644
--- a/Makefile
+++ b/Makefile
@@ -67,7 +67,8 @@ KERNEL_OBJ := \
 	kern/libkern/mini-printf.o \
 	kern/libkern/stdio.o \
 	kern/libkern/buddy.o \
-	kern/libkern/badrand.o
+	kern/libkern/badrand.o \
+	kern/libkern/hexdump.o
 
 kern/kernel.elf: $(KERNEL_OBJ)
 	@echo LD $@
diff --git a/kern/libkern/hexdump.c b/kern/libkern/hexdump.c
new file mode 100644
index 0000000..772095c
--- /dev/null
+++ b/kern/libkern/hexdump.c
@@ -0,0 +1,34 @@
+#include <stddef.h>
+#include <ctype.h>
+#include <stdio.h>
+
+void hexdump(const void *data, size_t size) {
+    const unsigned char *p = (const unsigned char *)data;
+    size_t               i, j;
+
+    for (i = 0; i < size; i += 16) {
+        // Print offset
+        kprintf("%08zx  ", i);
+
+        // Print hex bytes
+        for (j = 0; j < 16; j++) {
+            if (i + j < size) {
+                kprintf("%02X ", p[i + j]);
+            } else {
+                kprintf("   "); // padding for incomplete lines
+            }
+            if (j == 7)
+                kprintf(" "); // extra space in middle
+        }
+
+        kprintf(" |");
+
+        // Print ASCII characters
+        for (j = 0; j < 16 && i + j < size; j++) {
+            unsigned char c = p[i + j];
+            kprintf("%c", isprint(c) ? c : '.');
+        }
+
+        kprintf("|\n");
+    }
+}
diff --git a/kern/libkern/hexdump.h b/kern/libkern/hexdump.h
new file mode 100644
index 0000000..d01a907
--- /dev/null
+++ b/kern/libkern/hexdump.h
@@ -0,0 +1,8 @@
+#ifndef HEXDUMP_H
+#define HEXDUMP_H
+
+#include <stddef.h>
+
+void hexdump(const void *data, size_t size);
+
+#endif // HEXDUMP_H