diff --git a/inc/stdlib.h b/inc/stdlib.h
index 90cdb70..cdb20ff 100644
--- a/inc/stdlib.h
+++ b/inc/stdlib.h
@@ -36,6 +36,13 @@
 int32_t atoi(const char* str);
 int64_t atol(const char* str);
 
+
+char* utoa(uint32_t n, char* buffer, uint32_t radix);
+char* ultoa(uint64_t n, char* buffer, uint32_t radix);
+char* itoa(int32_t n, char* buffer, uint32_t radix);
+char* ltoa(int64_t n, char* buffer, uint32_t radix);
+
+
 float strtof(const char *str, char **endptr);
 
 void abort(void);
diff --git a/src/stdlib.c b/src/stdlib.c
index 4a373f6..37d6163 100644
--- a/src/stdlib.c
+++ b/src/stdlib.c
@@ -13,6 +13,9 @@
 #include <assert.h>
 
 
+static const char l_digits[] = "0123456789abcdef";
+
+
 __attribute__((weak)) 
 void rtlibc_abort_handler(void)
 {
@@ -306,6 +309,118 @@
 }
 
 
+char* utoa(uint32_t n, char* buffer, uint32_t radix)
+{
+	if ((radix < 2) || (radix > 16))
+		return buffer;
+
+	char str[36];
+	char* dptr = str + sizeof(str) - 1;
+	*dptr = 0;
+
+	while(n)
+	{	
+		*--dptr = l_digits[n % radix];
+		n /= radix;
+	}
+
+	if (*dptr == 0)
+		*--dptr = l_digits[0];
+
+	strcpy(buffer, dptr);
+
+	return buffer;
+}
+
+
+char* ultoa(uint64_t n, char* buffer, uint32_t radix)
+{
+	if ((radix < 2) || (radix > 16))
+		return buffer;
+
+	char str[72];
+	char* dptr = str + sizeof(str) - 1;
+	*dptr = 0;
+
+	while(n)
+	{	
+		*--dptr = l_digits[n % radix];
+		n /= radix;
+	}
+
+	if (*dptr == 0)
+		*--dptr = l_digits[0];
+
+	strcpy(buffer, dptr);
+
+	return buffer;
+}
+
+
+
+char* itoa(int32_t n, char* buffer, uint32_t radix)
+{
+	if ((radix < 2) || (radix > 16))
+		return buffer;
+
+	char str[36];
+	char* dptr = str + sizeof(str) - 1;
+	*dptr = 0;
+
+	const bool negative = (radix == 10) && (n < 0);
+
+	uint32_t x = negative ? -n : n;
+
+	while(x)
+	{	
+		*--dptr = l_digits[x % radix];
+		x /= radix;
+	}
+
+	if (*dptr == 0)
+		*--dptr = l_digits[0];
+
+	if (negative)
+		*--dptr = '-';
+
+	strcpy(buffer, dptr);
+
+	return buffer;
+}
+
+
+char* ltoa(int64_t n, char* buffer, uint32_t radix)
+{
+	if ((radix < 2) || (radix > 16))
+		return buffer;
+
+	char str[72];
+	char* dptr = str + sizeof(str) - 1;
+	*dptr = 0;
+
+	const bool negative = (radix == 10) && (n < 0);
+
+	uint64_t x = negative ? -n : n;
+
+	while(x)
+	{	
+		*--dptr = l_digits[x % radix];
+		x /= radix;
+	}
+
+	if (*dptr == 0)
+		*--dptr = l_digits[0];
+
+	if (negative)
+		*--dptr = '-';
+
+	strcpy(buffer, dptr);
+
+	return buffer;
+}
+
+
+
 
 void abort(void)
 {