diff --git a/include/ctype.h b/include/ctype.h
new file mode 100644
index 0000000..e85269d
--- /dev/null
+++ b/include/ctype.h
@@ -0,0 +1,38 @@
+//
+// Created by rick on 25-03-21.
+//
+
+#ifndef NEW_KERNEL_CTYPE_H
+#define NEW_KERNEL_CTYPE_H
+
+inline int tolower(int c);
+
+int toupper(int c);
+
+int isalnum(int c);
+
+int isalpha(int c);
+
+int iscntrl(int c);
+
+int isdigit(int c);
+
+int isgraph(int c);
+
+int islower(int c);
+
+int isprint(int c);
+
+int ispunct(int c);
+
+int isspace(int c);
+
+int isupper(int c);
+
+int isxdigit(int c);
+
+int isascii(int c);
+
+int isblank(int c);
+
+#endif //NEW_KERNEL_CTYPE_H
diff --git a/include/stdio.h b/include/stdio.h
index 01e5bda..1a24f9f 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -38,6 +38,8 @@ void setbuf(FILE *, char *);
 
 int vfprintf(FILE *, const char *, va_list);
 
+int vprintf(const char* fmt, va_list args);
+
 int printf(const char *fmt, ...);
 
 int sprintf(char *target, const char *fmt, ...);
diff --git a/include/string.h b/include/string.h
index 745fd7a..12aefd2 100644
--- a/include/string.h
+++ b/include/string.h
@@ -13,12 +13,20 @@ int memset(void *dst, int data, size_t amount);
 
 int strcpy(char *dst, const char *src);
 
+int strncpy(char *dst, const char *src, size_t n);
+
 size_t strlen(const char *str);
 
 const char *strchr(const char *s, char c);
 
+int memcmp(const void *s1, const void *s2, size_t n);
+
 int strcmp(const char *s1, const char *s2);
 
 int strncmp(const char *s1, const char *s2, int n);
 
+char *strcat(char *dest, const char *src);
+
+char *strncat(char *dest, const char *src, size_t n);
+
 #endif //NEW_KERNEL_STRING_H
diff --git a/kernel/command.c b/kernel/command.c
index c66dd57..ea5c52d 100644
--- a/kernel/command.c
+++ b/kernel/command.c
@@ -72,7 +72,7 @@ cmd_handler cmd_handlers[] = {
         {NULL, NULL},
 };
 
-void smash(const char* args) {
+void smash(const char *args) {
     char data[16];
     memset(data, 'A', 32);
 }
diff --git a/kernel/cpu/gdt.c b/kernel/cpu/gdt.c
index 164af63..a584997 100644
--- a/kernel/cpu/gdt.c
+++ b/kernel/cpu/gdt.c
@@ -106,7 +106,8 @@ gdt_t gdts[num_gdts] = {
                 .executable = true,
                 .read_write = true,
                 .privilege = 0,
-        }, { // 0x10 kernel data
+        },
+        { // 0x10 kernel data
                 .present = true,
                 .base = 0,
                 .limit = 0xFFFFFFFF,
@@ -115,7 +116,8 @@ gdt_t gdts[num_gdts] = {
                 .granularity = true,
                 .executable = false,
                 .read_write = true,
-        }, { // 0x18 user code
+        },
+        { // 0x18 user code
                 .present = true,
                 .base = 0,
                 .limit = 0xFFFFFFFF,
@@ -125,7 +127,8 @@ gdt_t gdts[num_gdts] = {
                 .granularity = true,
                 .executable = true,
                 .read_write = true,
-        }, { // 0x20 user  data
+        },
+        { // 0x20 user  data
                 .present = true,
                 .base = 0,
                 .limit = 0xFFFFFFFF,
@@ -135,7 +138,8 @@ gdt_t gdts[num_gdts] = {
                 .granularity = true,
                 .executable = true,
                 .read_write = true,
-        }, { // 0x28 tss
+        },
+        { // 0x28 tss
                 .base = (uint32_t) &tss,
                 .limit = sizeof(tss_t),
                 .present = true,
diff --git a/kernel/libc/ctype.c b/kernel/libc/ctype.c
new file mode 100644
index 0000000..9eacac2
--- /dev/null
+++ b/kernel/libc/ctype.c
@@ -0,0 +1,81 @@
+//
+// Created by rick on 25-03-21.
+//
+
+#include <ctype.h>
+
+int tolower(int c) {
+    if (c > 0xFF) {
+        // uh own
+        return c;
+    }
+    if (c >= 'A' && c <= 'Z') {
+        return c - 'A' + 'a';
+    }
+    return c;
+}
+
+int toupper(int c) {
+    if (c > 0xFF) {
+        // uh own
+        return c;
+    }
+    if (c >= 'a' && c <= 'z') {
+        return c - 'a' + 'A';
+    }
+    return c;
+}
+
+int isascii(int c) {
+    return c <= 0x7F;
+}
+
+int isblank(int c) {
+    return c == ' ' || c == '\t';
+}
+
+int iscntrl(int c) {
+    return c <= 0x1F || c == 0x7F;
+}
+
+int isdigit(int c) {
+    return c >= '0' && c <= '9';
+}
+
+int isgraph(int c) {
+    return c > ' ' && c < 0x7F;
+}
+
+int islower(int c) {
+    return c >= 'a' && c <= 'z';
+}
+
+int isprint(int c) {
+    return c >= ' ' && c < 0x7F;
+}
+
+int ispunct(int c) {
+    return (c > ' ' && c <= '@')
+           || (c >= '[' && c <= '`')
+           || (c >= '{' && c <= '~');
+}
+
+int isspace(int c) {
+    return c == ' ' || (c >= '\t' && c <= '\r');
+}
+
+int isupper(int c) {
+    return c >= 'A' && c <= 'Z';
+}
+
+int isxdigit(int c) {
+    return isdigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
+}
+
+int isalpha(int c) {
+    return isupper(c) | islower(c);
+}
+
+int isalnum(int c) {
+    return isalpha(c) || isdigit(c);
+}
diff --git a/kernel/libc/kprintf.c b/kernel/libc/kprintf.c
index 35d2116..da942d9 100644
--- a/kernel/libc/kprintf.c
+++ b/kernel/libc/kprintf.c
@@ -33,28 +33,51 @@ void print_int(uint32_t value, uint32_t width, char *buf, uint32_t *ptr, uint8_t
     }
 }
 
+void vasprintf_unsupported(char c) {
+    char *msg = "FMT '%x' is not supported\n";
+    msg[6] = c;
+    k_panics(msg);
+}
+
 uint32_t vasprintf(char *buf, const char *fmt, va_list args) {
     uint32_t ptr = 0;
-    for (int i = 0; i < strlen(fmt); ++i) {
+    for (size_t i = 0; i < strlen(fmt); ++i) {
         if (fmt[i] != '%') {
             buf[ptr++] = fmt[i];
             continue;
         }
         ++i;
-        uint32_t arg_width = 0;
-        while (fmt[i] >= '0' && fmt[i] <= '9') {
-            arg_width *= 10;
-            arg_width += fmt[i] - '0';
+        uint32_t field_width = 0;
+        uint32_t precision = 0; // todo
+        bool negative_field_width = false; // todo
+        if (fmt[i] == '-') {
+            // invert
+            negative_field_width = true;
             ++i;
         }
+        while (fmt[i] >= '0' && fmt[i] <= '9') {
+            field_width *= 10;
+            field_width += fmt[i] - '0';
+            ++i;
+        }
+        if (fmt[i] == '.') {
+            ++i;
+            while (fmt[i] >= '0' && fmt[i] <= '9') {
+                precision *= 10;
+                precision += fmt[i] - '0';
+                ++i;
+            }
+        }
         switch (fmt[i]) {
             case 's': { // string
+                uint32_t j = 0;
                 const char *s_fmt = (char *) va_arg(args, char*);
                 if (s_fmt == NULL) {
                     s_fmt = printf_null_str;
                 }
-                while (*s_fmt) {
+                while (*s_fmt && (precision == 0 || j != precision)) {
                     buf[ptr++] = *s_fmt++;
+                    j++;
                 }
                 break;
             }
@@ -62,18 +85,19 @@ uint32_t vasprintf(char *buf, const char *fmt, va_list args) {
                 buf[ptr++] = (char) va_arg(args, int);
                 break;
             case 'x':
-                print_int((uint32_t) va_arg(args, uint32_t), arg_width, buf, &ptr, 16);
+            case 'X': // todo capitalize
+                print_int((uint32_t) va_arg(args, uint32_t), field_width, buf, &ptr, 16);
                 break;
             case 'i':
             case 'd':
-                print_int((uint32_t) va_arg(args, uint32_t), arg_width, buf, &ptr, 10);
+            case 'u':
+                print_int((uint32_t) va_arg(args, uint32_t), field_width, buf, &ptr, 10);
                 break;
             case '%':
                 buf[ptr++] = '%';
                 break;
             default:
-                printf("FMT '%c' is not supported\n", fmt[i]);
-                k_panic();
+                vasprintf_unsupported(fmt[i]);
                 break;
         }
     }
@@ -81,14 +105,20 @@ uint32_t vasprintf(char *buf, const char *fmt, va_list args) {
     return ptr;
 }
 
-int printf(const char *fmt, ...) {
+int vprintf(const char *fmt, va_list args) {
     int result;
     char buf[1024] = {-1};
+    result = vasprintf(buf, fmt, args);
+    kprint(buf);
+    return result;
+}
+
+int printf(const char *fmt, ...) {
+    int result;
     va_list args;
     va_start(args, fmt);
-    result = vasprintf(buf, fmt, args);
+    result = vprintf(fmt, args);
     va_end(args);
-    kprint(buf);
     return result;
 }
 
diff --git a/kernel/libc/string.c b/kernel/libc/string.c
index a97b54c..365012b 100644
--- a/kernel/libc/string.c
+++ b/kernel/libc/string.c
@@ -4,6 +4,7 @@
 
 #include <string.h>
 #include <sys/param.h>
+#include <sys/types.h>
 
 int memcpy(void *dst, const void *src, size_t amount) {
     for (size_t i = 0; i < amount; i++) {
@@ -24,6 +25,10 @@ int strcpy(char *dst, const char *src) {
     return memcpy(dst, src, strlen(src) + 1);
 }
 
+int strncpy(char *dst, const char *src, size_t n) {
+    return memcpy(dst, src, MIN(strlen(src), n) + 1);
+}
+
 size_t strlen(const char *str) {
     int length = 0;
     while (str[length] != 0) {
@@ -51,6 +56,17 @@ const char *strchr(const char *s, char c) {
     }
 }
 
+int memcmp(const void *s1, const void *s2, size_t n) {
+    uint8_t a, b;
+    for (size_t i = 0; i < n; ++i) {
+        a = ((uint8_t *) s1)[i];
+        b = ((uint8_t *) s2)[i];
+        if (a > b) return 1;
+        if (b < a) return -1;
+    }
+    return 0;
+}
+
 int strncmp(const char *s1, const char *s2, int n) {
     for (int i = 0; i < n; ++i) {
         if (s1[i] == 0 && s2[i] == 0) {
@@ -71,3 +87,21 @@ int strncmp(const char *s1, const char *s2, int n) {
     }
     return 0;
 }
+
+char *strcat(char *dest, const char *src) {
+    size_t count = strlen(src);
+    return strncat(dest, src, count);
+}
+
+char *strncat(char *dest, const char *src, size_t n) {
+    size_t start = strlen(dest);
+    for (size_t index = 0; index < n; index++) {
+        char val = src[index];
+        dest[start + index] = val;
+        if (val == 0) {
+            dest[start + index] = 0;
+            break;
+        }
+    }
+    return dest;
+}
diff --git a/kernel/tasks/locking.c b/kernel/tasks/locking.c
index cb74032..a763020 100644
--- a/kernel/tasks/locking.c
+++ b/kernel/tasks/locking.c
@@ -126,7 +126,9 @@ void mutex_free(mutex_t *mutex) {
 }
 
 spinlock_t *spinlock_create() {
-    return malloc(sizeof(spinlock_t));
+    spinlock_t *lock = malloc(sizeof(spinlock_t));
+    lock->lock = false;
+    return lock;
 }
 
 void spinlock_acquire(spinlock_t *spinlock) {
diff --git a/kernel/util/ssp.c b/kernel/util/ssp.c
index 7fe1cd0..d2cf94a 100644
--- a/kernel/util/ssp.c
+++ b/kernel/util/ssp.c
@@ -4,10 +4,13 @@
 // stack smashing protector
 
 #include <stdint.h>
+
 #if __STDC_HOSTED__
 #include <stdlib.h>
 #else
+
 #include <myke/libk/libk.h>
+
 #endif
 
 #if UINT32_MAX == UINTPTR_MAX