diff --git a/include/eduos/ctype.h b/include/eduos/ctype.h
new file mode 100644
index 0000000..c31e6e4
--- /dev/null
+++ b/include/eduos/ctype.h
@@ -0,0 +1,129 @@
+/****************************************************************************************
+ *
+ * Author: Stefan Lankes
+ *         Chair for Operating Systems, RWTH Aachen University
+ * Date:   24/03/2011
+ *
+ ****************************************************************************************
+ * 
+ * Written by the Chair for Operating Systems, RWTH Aachen University
+ * 
+ * NO Copyright (C) 2010, Stefan Lankes,
+ * consider these trivial functions to be public domain.
+ * 
+ * These functions are distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ */ 
+
+/** 
+ * @author Stefan Lankes
+ * @file include/eduos/ctype.h
+ * @brief Functions related to alphanumerical character values
+ *
+ * This file contains functions helping to determine 
+ * the type of alphanumerical character values.
+ */
+
+#ifndef __CTYPE_H_
+#define __CYTPE_H_
+
+/** Returns true if the value of 'c' is an ASCII-charater */
+static inline int isascii(int c) 
+{
+	return (((unsigned char)(c))<=0x7f);
+}
+
+/** Applies an and-operation to 
+ * push the value of 'c' into the ASCII-range */
+static inline int toascii(int c)
+{
+	return (((unsigned char)(c))&0x7f);
+}
+
+/** Returns true if the value of 'c' is the 
+ * space character or a control character */
+static inline int isspace(int c)
+{
+	if (!isascii(c))
+		return 0;
+
+	if (' ' == (unsigned char) c)
+		return 1;
+	if ('\n' == (unsigned char) c)
+		return 1;
+	if ('\r' == (unsigned char) c)
+		return 1;
+	if ('\t' == (unsigned char) c)
+		return 1;
+	if ('\v' == (unsigned char) c)
+		return 1;
+	if ('\f' == (unsigned char) c)
+		return 1;
+
+	return 0;
+}
+
+/** Returns true if the value of 'c' is a number */
+static inline int isdigit(int c)
+{
+	if (!isascii(c))
+		return 0;
+
+	if (((unsigned char) c >= '0') && ((unsigned char) c <= '9'))
+		return 1;
+
+	return 0;
+}
+
+/** Returns true if the value of 'c' is a lower case letter */
+static inline int islower(int c)
+{
+	if (!isascii(c))
+		return 0;
+
+	if (((unsigned char) c >= 'a') && ((unsigned char) c <= 'z'))
+		return 1;
+
+	return 0;
+}
+
+/** Returns true if the value of 'c' is an upper case letter */
+static inline int isupper(int c)
+{
+	if (!isascii(c))
+		return 0;
+
+	if (((unsigned char) c >= 'A') && ((unsigned char) c <= 'Z'))
+		return 1;
+
+	return 0;
+}
+
+/** Returns true if the value of 'c' is an alphabetic character */
+static inline int isalpha(int c)
+{
+	if (isupper(c) || islower(c))
+		return 1;
+
+	return 0;
+}
+
+/** Makes the input character lower case.\n Will do nothing if it 
+ * was something different than an upper case letter before. */
+static inline unsigned char tolower(unsigned char c)
+{
+	if (isupper(c))
+		c -= 'A'-'a';
+	return c;
+}
+
+/** Makes the input character upper case.\n Will do nothing if it 
+ * was something different than a lower case letter before. */
+static inline unsigned char toupper(unsigned char c)
+{
+	if (islower(c))
+		c -= 'a'-'A';
+	return c;
+}
+
+#endif
diff --git a/include/eduos/stdlib.h b/include/eduos/stdlib.h
index eaed27c..6d87e91 100644
--- a/include/eduos/stdlib.h
+++ b/include/eduos/stdlib.h
@@ -38,7 +38,7 @@
 #define __STDLIB_H__
 
 #include <eduos/config.h>
-#include <asm/stddef.h>
+#include <eduos/stddef.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -50,6 +50,29 @@ extern "C" {
  */
 void* create_stack(tid_t id);
 
+/** @brief String to long
+ *
+ * @return Long value of the parsed numerical string
+ */
+long strtol(const char* str, char** endptr, int base);
+
+/** @brief String to unsigned long
+ *
+ * @return Unsigned long value of the parsed numerical string
+ */
+unsigned long strtoul(const char* nptr, char** endptr, int base);
+
+/** @brief ASCII to integer
+ *
+ * Convenience function using strtol().
+ *
+ * @return Integer value of the parsed numerical string
+ */
+static inline int atoi(const char *str)
+{
+	return (int)strtol(str, (char **)NULL, 10);
+}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/eduos/string.h b/include/eduos/string.h
index 70284fa..3d86c29 100644
--- a/include/eduos/string.h
+++ b/include/eduos/string.h
@@ -54,11 +54,11 @@ size_t strlen(const char *str);
 #endif
 
 #ifndef HAVE_ARCH_STRNCPY
-char* strncpy(char *dest, const char *src, size_t n);
+char *strncpy(char *dest, const char *src, size_t n);
 #endif
 
 #ifndef HAVE_ARCH_STRCPY
-char* strcpy(char *dest, const char *src);
+char *strcpy(char *dest, const char *src);
 #endif
 
 #ifndef HAVE_ARCH_STRCMP
@@ -69,6 +69,8 @@ int strcmp(const char *s1, const char *s2);
 int strncmp(const char *s1, const char *s2, size_t n);
 #endif
 
+char *strstr(const char *s, const char *find);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/libkern/Makefile b/libkern/Makefile
index 3da1611..6247dab 100644
--- a/libkern/Makefile
+++ b/libkern/Makefile
@@ -1,4 +1,4 @@
-C_source := string.c stdio.c printf.c sprintf.c moddi3.c umoddi3.c divdi3.c udivdi3.c qdivrem.c 
+C_source := string.c stdio.c printf.c sprintf.c strtol.c strtoul.c strstr.c moddi3.c umoddi3.c divdi3.c udivdi3.c qdivrem.c 
 MODULE := libkern
 
 include $(TOPDIR)/Makefile.inc
diff --git a/libkern/stdio.c b/libkern/stdio.c
index 8530ae4..8166f6a 100644
--- a/libkern/stdio.c
+++ b/libkern/stdio.c
@@ -31,6 +31,7 @@
 #include <eduos/spinlock.h>
 #include <asm/atomic.h>
 #include <asm/processor.h>
+#include <asm/multiboot.h>
 #ifdef CONFIG_VGA
 #include <asm/vga.h>
 #endif
@@ -56,6 +57,11 @@ int koutput_init(void)
 #ifdef CONFIG_VGA
 	vga_init();
 #endif
+#ifdef CONFIG_UART
+	if (mb_info && (mb_info->flags & MULTIBOOT_INFO_CMDLINE))
+		if (!uart_early_init((char*) mb_info->cmdline))
+			early_print |= UART_EARLY_PRINT;
+#endif
 
 	return 0;
 }
@@ -114,12 +120,14 @@ int kputs(const char *str)
 int koutput_add_uart(void)
 {
 #ifdef CONFIG_UART
-	uint32_t i;
+	if (!(early_print & UART_EARLY_PRINT)) {
+		uint32_t i;
 
-	early_print |= UART_EARLY_PRINT;
+		early_print |= UART_EARLY_PRINT;
 
-	for(i=0; i<atomic_int32_read(&kmsg_counter); i++)
-		uart_putchar(kmessages[i % KMSG_SIZE]);
+		for(i=0; i<atomic_int32_read(&kmsg_counter); i++)
+			uart_putchar(kmessages[i % KMSG_SIZE]);
+	}
 
 	return 0;
 #else
diff --git a/libkern/strstr.c b/libkern/strstr.c
new file mode 100644
index 0000000..74592a3
--- /dev/null
+++ b/libkern/strstr.c
@@ -0,0 +1,69 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * The code has been taken from FreeBSD (sys/libkern/strstr.c) and is therefore
+ * BSD-licensed. Unnecessary functions have been removed and all typedefs required
+ * have been added.
+ */
+
+/* eduOS prelude */
+#include <eduos/stdlib.h>
+#include <eduos/string.h>
+#include <eduos/ctype.h>
+#include <asm/limits.h>
+
+/*
+ * Find the first occurrence of find in s.
+ */
+char *
+strstr(const char *s, const char *find)
+{
+	char c, sc;
+	size_t len;
+
+	if ((c = *find++) != 0) {
+		len = strlen(find);
+		do {
+			do {
+				if ((sc = *s++) == 0)
+					return (NULL);
+			} while (sc != c);
+		} while (strncmp(s, find, len) != 0);
+		s--;
+	}
+	return ((char *) s);
+}
diff --git a/libkern/strtol.c b/libkern/strtol.c
new file mode 100644
index 0000000..68715c8
--- /dev/null
+++ b/libkern/strtol.c
@@ -0,0 +1,133 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * From: @(#)strtol.c	8.1 (Berkeley) 6/4/93
+ */
+
+/* 
+ * The code has been taken from FreeBSD (sys/libkern/strtol.c) and is therefore 
+ * BSD-licensed. Unnecessary functions have been removed and all typedefs required 
+ * have been added.
+ */
+
+/* eduOS prelude */
+#include <eduos/stddef.h>
+#include <eduos/ctype.h>
+#include <asm/limits.h>
+
+/*
+ * Convert a string to a long integer.
+ *
+ * Ignores `locale' stuff.  Assumes that the upper and lower case
+ * alphabets and digits are each contiguous.
+ */
+long
+strtol(nptr, endptr, base)
+	const char *nptr;
+	char **endptr;
+	int base;
+{
+	const char *s = nptr;
+	unsigned long acc;
+	unsigned char c;
+	unsigned long cutoff;
+	int neg = 0, any, cutlim;
+
+	/*
+	 * Skip white space and pick up leading +/- sign if any.
+	 * If base is 0, allow 0x for hex and 0 for octal, else
+	 * assume decimal; if base is already 16, allow 0x.
+	 */
+	do {
+		c = *s++;
+	} while (isspace(c));
+	if (c == '-') {
+		neg = 1;
+		c = *s++;
+	} else if (c == '+')
+		c = *s++;
+	if ((base == 0 || base == 16) &&
+	    c == '0' && (*s == 'x' || *s == 'X')) {
+		c = s[1];
+		s += 2;
+		base = 16;
+	}
+	if (base == 0)
+		base = c == '0' ? 8 : 10;
+
+	/*
+	 * Compute the cutoff value between legal numbers and illegal
+	 * numbers.  That is the largest legal value, divided by the
+	 * base.  An input number that is greater than this value, if
+	 * followed by a legal input character, is too big.  One that
+	 * is equal to this value may be valid or not; the limit
+	 * between valid and invalid numbers is then based on the last
+	 * digit.  For instance, if the range for longs is
+	 * [-2147483648..2147483647] and the input base is 10,
+	 * cutoff will be set to 214748364 and cutlim to either
+	 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
+	 * a value > 214748364, or equal but the next digit is > 7 (or 8),
+	 * the number is too big, and we will return a range error.
+	 *
+	 * Set any if any `digits' consumed; make it negative to indicate
+	 * overflow.
+	 */
+	cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
+	cutlim = cutoff % (unsigned long)base;
+	cutoff /= (unsigned long)base;
+	for (acc = 0, any = 0;; c = *s++) {
+		if (!isascii(c))
+			break;
+		if (isdigit(c))
+			c -= '0';
+		else if (isalpha(c))
+			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
+		else
+			break;
+		if (c >= base)
+			break;
+		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
+			any = -1;
+		else {
+			any = 1;
+			acc *= base;
+			acc += c;
+		}
+	}
+	if (any < 0) {
+		acc = neg ? LONG_MIN : LONG_MAX;
+	} else if (neg)
+		acc = -acc;
+	if (endptr != 0)
+		*((const char **)endptr) = any ? s - 1 : nptr;
+	return (acc);
+}
+
diff --git a/libkern/strtoul.c b/libkern/strtoul.c
new file mode 100644
index 0000000..f7d5afc
--- /dev/null
+++ b/libkern/strtoul.c
@@ -0,0 +1,112 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * From: @(#)strtoul.c	8.1 (Berkeley) 6/4/93
+ */
+
+/* 
+ * The code has been taken from FreeBSD (sys/libkern/strtoul.c) and is therefore 
+ * BSD-licensed. Unnecessary functions have been removed and all typedefs required 
+ * have been added.
+ */
+
+/* eduOS prelude */
+#include <eduos/stddef.h>
+#include <eduos/ctype.h>
+#include <asm/limits.h>
+
+/*
+ * Convert a string to an unsigned long integer.
+ *
+ * Ignores `locale' stuff.  Assumes that the upper and lower case
+ * alphabets and digits are each contiguous.
+ */
+unsigned long
+strtoul(nptr, endptr, base)
+	const char *nptr;
+	char **endptr;
+	int base;
+{
+	const char *s = nptr;
+	unsigned long acc;
+	unsigned char c;
+	unsigned long cutoff;
+	int neg = 0, any, cutlim;
+
+	/*
+	 * See strtol for comments as to the logic used.
+	 */
+	do {
+		c = *s++;
+	} while (isspace(c));
+	if (c == '-') {
+		neg = 1;
+		c = *s++;
+	} else if (c == '+')
+		c = *s++;
+	if ((base == 0 || base == 16) &&
+	    c == '0' && (*s == 'x' || *s == 'X')) {
+		c = s[1];
+		s += 2;
+		base = 16;
+	}
+	if (base == 0)
+		base = c == '0' ? 8 : 10;
+	cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
+	cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
+	for (acc = 0, any = 0;; c = *s++) {
+		if (!isascii(c))
+			break;
+		if (isdigit(c))
+			c -= '0';
+		else if (isalpha(c))
+			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
+		else
+			break;
+		if (c >= base)
+			break;
+		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
+			any = -1;
+		else {
+			any = 1;
+			acc *= base;
+			acc += c;
+		}
+	}
+	if (any < 0) {
+		acc = ULONG_MAX;
+	} else if (neg)
+		acc = -acc;
+	if (endptr != 0)
+		*((const char **)endptr) = any ? s - 1 : nptr;
+	return (acc);
+}
+