implement human-unit printing

kernel/src/arch/x86/bochs.c

@@ -1,3 +1,3 @@
 void breakpoint() {
     asm volatile ("xchgw %bx, %bx");
-}
+}

kernel/src/arch/x86/stivale2-parse.c

@@ -17,7 +17,7 @@ void parse_stivale2(struct stivale2_struct *info) {
                 printf("Memmap (%d entries):\n", m->entries);
                 for (size_t i = 0; i < m->entries; i++) {
                     struct stivale2_mmap_entry me = m->memmap[i];
-                    printf("\t[%x+%x] %x\n", me.base, me.length, me.type);
+                    printf("\t[%x+%h] %x\n", me.base, me.length, me.type);
                 }
                 break;
             }

kernel/src/print/print.c

@@ -14,6 +14,7 @@ void print(const char* c) {
 }
 
 static const char CONVERSION_TABLE[] = "0123456789abcdef";
+static const char UNITS[] = "bKM";
 
 static void printhex(size_t num) {
     int i;
@@ -56,6 +57,16 @@ static void printdec(size_t num) {
     puts(&buf[i]);
 }
 
+static void printhuman(size_t num) {
+    const char *unit = UNITS;
+    while(num >= 2048 && *(unit+1)) {
+        num /= 1024;
+        unit++;
+    }
+    printdec(num);
+    putchar(*unit);
+}
+
 void printf(const char *format, ...) {
     va_list argp;
     va_start(argp, format);
@@ -69,7 +80,9 @@ void printf(const char *format, ...) {
                 printdec(va_arg(argp, size_t));
             } else if (*format == 's') {
                 puts(va_arg(argp, char*));
-            } 
+            } else if (*format == 'h') {
+                printhuman(va_arg(argp, size_t));
+            }
         } else {
             putchar(*format);
         }