diff --git a/core/klibc.c b/core/klibc.c
index f309a53..c229352 100644
--- a/core/klibc.c
+++ b/core/klibc.c
@@ -127,36 +127,46 @@ char *strzcpy(register char *dst, register const char *src, register int len)
     return dst;
 }
 
-void printf(const char *format, ...)
+int printf(const char *format, ...)
 {
+    int ret;
+
     va_list ap;
     va_start(ap, format);
-    vprintf(format, ap);
+    ret = vprintf(format, ap);
     va_end(ap);
+
+    return ret;
 }
 
-void puts(const char *str)
+int puts(const char *str)
 {
+    int ret = 0;
     while (*str) {
         putc(*(str++));
+        ret++;
     }
+    return ret;
 }
 
-void putc(const char str)
+int putc(const char c)
 {
-    VGAputc(str);
-    serialPutc(str);
+    VGAputc(c);
+    serialPutc(c);
+    return (unsigned char)c;
 }
 
-void printInt64(long long int integer)
+int printInt64(long long int integer)
 {
     char num[sizeof(integer) *
              3]; // int max is 2^(sizeof(int)*8) which is (2^3)^(sizeof(int)*8/3)
                  // = 8^(sizeof(int)*8/3) ~ 10^(sizeof(int)*8/3)
     int i = 0;
+    int ret = 0;
 
     if (integer < 0) {
         putc('-');
+        ret++;
     }
 
     do {
@@ -167,18 +177,22 @@ void printInt64(long long int integer)
 
     for (i = i - 1; i >= 0; i--) {
         putc(num[i] + '0');
+        ret++;
     }
+    return ret;
 }
 
-void printInt(int integer)
+int printInt(int integer)
 {
     char num[sizeof(integer) *
              3]; // int max is 2^(sizeof(int)*8) which is (2^3)^(sizeof(int)*8/3)
                  // = 8^(sizeof(int)*8/3) ~ 10^(sizeof(int)*8/3)
-    int i = 0;
+    int i   = 0;
+    int ret = 0;
 
     if (integer < 0) {
         putc('-');
+        ret++;
     }
 
     do {
@@ -189,12 +203,15 @@ void printInt(int integer)
 
     for (i = i - 1; i >= 0; i--) {
         putc(num[i] + '0');
+        ret++;
     }
+    return ret;
 }
 
-void vprintf(const char *format, va_list ap)
+int vprintf(const char *format, va_list ap)
 {
-    int i = 0;
+    int i   = 0;
+    int ret = 0;
     while (format[i] != '\0') {
         switch (format[i]) {
             case '%':
@@ -202,7 +219,7 @@ void vprintf(const char *format, va_list ap)
                     case 'i':
                     case 'd': {
                         int d = va_arg(ap, int);
-                        printInt(d);
+                        ret += printInt(d);
                         break;
                     }
                     case 'p':
@@ -210,23 +227,25 @@ void vprintf(const char *format, va_list ap)
                         char val[sizeof(int) * 2];
                         int d = va_arg(ap, int);
                         itoa(d, val, 16);
-                        puts(val);
+                        ret += puts(val);
                         break;
                     }
                     case 'c': {
                         int c = va_arg(ap, int);
                         putc((char)c);
+                        ret++;
                         break;
                     }
                     case 's': {
                         char *str = va_arg(ap, char *);
                         if (!str)
                             str = "[NULL STR]";
-                        puts(str);
+                        ret += puts(str);
                         break;
                     }
                     case '%':
                         putc('%');
+                        ret++;
                         break;
                     case 'l':
                         switch (format[i + 2]) {
@@ -234,7 +253,7 @@ void vprintf(const char *format, va_list ap)
                                 switch (format[i + 3]) {
                                     case 'd': {
                                         long long int d = va_arg(ap, long long int);
-                                        printInt64(d);
+                                        ret += printInt64(d);
                                         break;
                                     }
                                     case 'p':
@@ -242,7 +261,7 @@ void vprintf(const char *format, va_list ap)
                                         char val[sizeof(long long int) * 2];
                                         long long int d = va_arg(ap, long long int);
                                         itoa(d, val, 16);
-                                        puts(val);
+                                        ret += puts(val);
                                         break;
                                     }
                                 }
@@ -251,7 +270,7 @@ void vprintf(const char *format, va_list ap)
                             case 'i':
                             case 'd': {
                                 long int d = va_arg(ap, long int);
-                                printInt64(d);
+                                ret += printInt64(d);
                                 break;
                             }
                         }
@@ -263,7 +282,9 @@ void vprintf(const char *format, va_list ap)
 
             default:
                 putc(format[i]);
+                ret++;
         }
         i++;
     }
+    return ret;
 }
diff --git a/core/klibc.h b/core/klibc.h
index 5f6d10e..f3b4e06 100644
--- a/core/klibc.h
+++ b/core/klibc.h
@@ -19,10 +19,10 @@ int strlen(const char s[]);
 unsigned int strnlen(const char *s, size_t count);
 int strcmp(const char s1[], const char s2[]);
 char *strzcpy(char *dst, const char *src, int len);
-void puts(const char *str);
-void putc(const char str);
-void vprintf(const char *format, va_list ap);
-void printf(const char *format, ...);
+int puts(const char *str);
+int putc(const char str);
+int vprintf(const char *format, va_list ap);
+int printf(const char *format, ...);
 
 /*
  * Dummy printk for disabled debugging statements to use whilst maintaining