feat: added printf

kernel/kernel.c

@@ -14,6 +14,7 @@
 #include <libk.h>
 #include <drivers/pci.h>
 #include <drivers/ide.h>
+#include <libc/kprintf.h>
 
 #define BOOTLOADER_NAME_MAX_LENGTH 64
 #define CMDLINE_MAX_LENGTH 256
@@ -44,12 +45,10 @@ cmd_handler cmd_handlers[] = {
 };
 
 void print_bootinfo() {
-    kprint("Bootloader name: ");
-    kprint(bootloader_name[0] == 0 ? "NULL" : bootloader_name);
-    kprint(newline);
-    kprint("cmdline: ");
-    kprint(cmdline[0] == 0 ? "NULL" : cmdline);
-    kprint(newline);
+    printf("Bootloader name: %s\n"
+           "cmdline: %s\n",
+           (bootloader_name[0] == 0 ? "NULL" : bootloader_name),
+           (cmdline[0] == 0 ? "NULL" : cmdline));
 }
 
 void help(const char* arg) {
@@ -59,8 +58,7 @@ void help(const char* arg) {
         if (cmd_handlers[index].cmd == NULL) {
             break;
         }
-        kprint(cmd_handlers[index].cmd);
-        kprint(newline);
+        printf("%s\n", cmd_handlers[index].cmd);
         index += 1;
     }
 
@@ -96,16 +94,14 @@ void store_bootloader_info(multiboot_info_t *multiboot_info) {
     if (multiboot_info->flags & MULTIBOOT_INFO_CMDLINE) {
         int cmdline_length = strlen((const char *) multiboot_info->cmdline);
         if (cmdline_length > CMDLINE_MAX_LENGTH) {
-            kprint("cmdline to long!");
-            k_panic();
+            k_panics("cmdline to long!\n");
         }
         memcpy(cmdline, (char *) multiboot_info->cmdline, cmdline_length);
     }
     if (multiboot_info->flags & MULTIBOOT_INFO_BOOT_LOADER_NAME) {
         int bootloader_length = strlen((const char *) multiboot_info->boot_loader_name);
         if (bootloader_length > BOOTLOADER_NAME_MAX_LENGTH) {
-            kprint("bootloader name to long!");
-            k_panic();
+            k_panics("bootloader name to long!\n");
         }
         memcpy(bootloader_name, (char *) multiboot_info->boot_loader_name, bootloader_length);
     }
@@ -117,8 +113,7 @@ void init_mmap(multiboot_info_t *multiboot_info) {
                             multiboot_info->mmap_length / sizeof(struct multiboot_mmap_entry));
         // todo fallback on other mechanisms?
     } else {
-        kprint("mmap invalid!\n");
-        k_panic();
+        k_panics("mmap invalid!\n");
     }
 }
 
@@ -156,8 +151,10 @@ void kmain(multiboot_info_t *multiboot_info) {
     // setup PS/2 keyboard
     init_keyboard();
 
-    u8* tmp = malloc(4096);
-    ide_read_access(0, 0, 0, 16, tmp);
+//    print_gdt();
+
+//    u8* tmp = malloc(4096);
+//    ide_read_access(0, 0, 0, 16, tmp);
 
     // enter main loop
     while (true) {

kernel/libc/kprintf.c

@@ -0,0 +1,84 @@
+//
+// Created by rick on 06-02-21.
+//
+
+#include "kprintf.h"
+#include "libc.h"
+#include <libc/string.h>
+#include <libc/va_list.h>
+#include <kprint.h>
+#include <libk.h>
+#include <types.h>
+
+/*
+ * Integer to string
+ */
+void print_int(u32 value, u32 width, char* buf, u32 *ptr, u8 base) {
+    // u32 in binary is 32 digits, so never longer than 33 digits
+    char msg[33];
+    itoa(value, msg, base);
+    u32 digits = strlen(msg);
+    if (digits < width) {
+        for (u32 i = 0; i < (width - digits); ++i) {
+            buf[*ptr] = '0';
+            *ptr += 1;
+        }
+    }
+    for (u32 i = 0; i < digits; ++i) {
+        buf[*ptr] = msg[i];
+        *ptr += 1;
+    }
+}
+
+u32 vasprintf(char *buf, const char *fmt, va_list args) {
+    u32 ptr = 0;
+    for (int i = 0; i < strlen(fmt); ++i) {
+        if (fmt[i] != '%') {
+            buf[ptr++] = fmt[i];
+            continue;
+        }
+        ++i;
+        u32 arg_width = 0;
+        while (fmt[i] >= '0' && fmt[i] <= '9') {
+            arg_width *= 10;
+            arg_width += fmt[i] - '0';
+            ++i;
+        }
+        switch (fmt[i]) {
+            case 's': { // string
+                char *s_fmt = (char *) va_arg(args, char*);
+                while (*s_fmt) {
+                    buf[ptr++] = *s_fmt++;
+                }
+                break;
+            }
+            case 'c':
+                buf[ptr++] = (char)va_arg(args, int);
+                break;
+            case 'x':
+                print_int((u32)va_arg(args, u32), arg_width, buf, &ptr, 16);
+                break;
+            case 'd':
+                print_int((u32)va_arg(args, u32), arg_width, buf, &ptr, 10);
+                break;
+            case '%':
+                buf[ptr++] = '%';
+                break;
+            default:
+                printf("FMT '%c' is not supported\n", fmt[i]);
+                k_panic();
+                break;
+        }
+    }
+    buf[ptr] = 0;
+    return ptr;
+}
+
+void printf(const char *fmt, ...) {
+    char buf[1024] = {-1};
+    va_list args;
+    va_start(args, fmt);
+    vasprintf(buf, fmt, args);
+    va_end(args);
+    kprint(buf);
+}

kernel/libc/kprintf.h

@@ -0,0 +1,10 @@
+//
+// Created by rick on 06-02-21.
+//
+
+#ifndef NEW_KERNEL_KPRINTF_H
+#define NEW_KERNEL_KPRINTF_H
+
+void printf(const char *fmt, ...);
+
+#endif //NEW_KERNEL_KPRINTF_H

kernel/libc/va_list.h

@@ -0,0 +1,14 @@
+//
+// Created by rick on 06-02-21.
+//
+
+#ifndef NEW_KERNEL_VA_LIST_H
+#define NEW_KERNEL_VA_LIST_H
+
+typedef __builtin_va_list va_list;
+#define va_start(ap,last) __builtin_va_start(ap, last)
+#define va_end(ap) __builtin_va_end(ap)
+#define va_arg(ap,type) __builtin_va_arg(ap,type)
+#define va_copy(dest, src) __builtin_va_copy(dest,src)
+
+#endif //NEW_KERNEL_VA_LIST_H

kernel/mem/mem.c

@@ -3,9 +3,8 @@
 //
 
 #include <types.h>
-#include <kprint.h>
 #include <mem/mem.h>
-#include <libc/libc.h>
+#include <libc/kprintf.h>
 
 #define MEMMAP_ENTRIES 16
 
@@ -28,22 +27,12 @@
 extern void *kernel_start;
 //extern void *kernel_end;
 
-char *msg_index = "Idx: ";
-char *msg_addr = "Address: ";
-char *msg_len = "Length:  ";
-char *msg_type = "Type:    ";
-char *msg_nl = "\n";
-char *msg_malloc_num_entries_avail = "Malloc avail entries: ";
-char *msg_malloc_num_entries_used  = "Malloc used  entries: ";
-
 typedef struct {
     void *address;
     u32 length;
     u32 type;
 } __attribute((packed)) mmap_entry;
 
-char *msg_lu = "0123456789ABCDEF";
-
 int malloc_entries = 0;
 int malloc_used = 0;
 
@@ -149,7 +138,7 @@ void *malloc(unsigned int size) {
             }
             malloc_used++;
             current_map->type = MALLOC_TYPE_USED;
-            return ((void*)current_map) + sizeof(malloc_map);
+            return ((void *) current_map) + sizeof(malloc_map);
 
             malloc_find_next:
             current_map = current_map->next;
@@ -168,21 +157,9 @@ void free(void *mem) {
 };
 
 
-void print_int(int val, int base) {
-    char tmp_str[32];
-    memset(tmp_str, 0, 32);
-    itoa(val, tmp_str, base);
-    kprint(tmp_str);
-}
-
 void print_malloc_info() {
-    kprint(msg_malloc_num_entries_avail);
-    print_int(malloc_entries, 10);
-    kprint(msg_nl);
-
-    kprint(msg_malloc_num_entries_used);
-    print_int(malloc_used, 10);
-    kprint(msg_nl);
+    printf("Malloc avail entries: %d\n"
+           "Malloc used entries: %d\n", malloc_entries, malloc_used);
 }
 
 
@@ -191,18 +168,9 @@ void print_mmap_info() {
         if (memmap[i].type == 0) {
             break;
         }
-        kprint(msg_index);
-        print_int(i, 10);
-        kprint(msg_nl);
-        kprint(msg_addr);
-        print_int((int) memmap[i].address, 16);
-        kprint(msg_nl);
-        kprint(msg_len);
-        print_int(memmap[i].length, 16);
-        kprint(msg_nl);
-        kprint(msg_type);
-        print_int(memmap[i].type, 10);
-        kprint(msg_nl);
-        kprint(msg_nl);
+        printf("Idx: %d\n"
+               "Address: %8x\n"
+               "Length:  %8x\n"
+               "Type: %d\n\n", i, memmap[i].address, memmap[i].length, memmap[i].type);
     }
 }