diff --git a/src/stdio.c b/src/stdio.c
index 6b4c60d..f3c84f1 100644
--- a/src/stdio.c
+++ b/src/stdio.c
@@ -6,27 +6,27 @@
 #include <../src/stdio_internal.h>
 
 
-
 static int32_t rtstring_output_handler(void* user, const char* data, size_t size)
 {
 	string_descriptor_t* const str_descriptor = (string_descriptor_t*)user;
-
-	const size_t len = size < (str_descriptor->len - 1) ? size : (str_descriptor->len - 1);
-
-	if (len)
+	if (str_descriptor->ptr && str_descriptor->len)
 	{
-		str_descriptor->len -= len;
+		const size_t len = size < (str_descriptor->len - 1) ? size : (str_descriptor->len - 1);
 
-		memcpy(str_descriptor->ptr, data, len);
-		str_descriptor->ptr += len;
-		*str_descriptor->ptr = 0;
+		if (len)
+		{
+			str_descriptor->len -= len;
+
+			memcpy(str_descriptor->ptr, data, len);
+			str_descriptor->ptr += len;
+			*str_descriptor->ptr = 0;
+		}
 	}
 
 	return size;
 }
 
 
-
 int32_t sprintf(char* str, const char* format, ...)
 {
 	va_list args;
@@ -42,21 +42,14 @@
 
 int32_t snprintf(char* str, size_t n, const char* format, ...)
 {
-	if (n > 0)
-	{
-		va_list args;
-		va_start(args, format);	
+	va_list args;
+	va_start(args, format);	
 
-		string_descriptor_t str_descriptor = {str, n};
-		const int32_t rv = rtprintf(rtstring_output_handler, &str_descriptor, format, args);
+	string_descriptor_t str_descriptor = {str, n};
+	const int32_t rv = rtprintf(rtstring_output_handler, &str_descriptor, format, args);
 
-		va_end(args);
-		return rv;
-	}
-	else
-	{
-		return 0;
-	}
+	va_end(args);
+	return rv;
 }
 
 
@@ -67,22 +60,13 @@
 }
 
 
-
 int32_t vsnprintf(char* str, size_t n, const char* format, va_list args)
 {
-	if (n > 0)
-	{
-		string_descriptor_t str_descriptor = {str, n};
-		return rtprintf(rtstring_output_handler, &str_descriptor, format, args);
-	}
-	else
-	{
-		return 0;
-	}
+	string_descriptor_t str_descriptor = {str, n};
+	return rtprintf(rtstring_output_handler, &str_descriptor, format, args);
 }
 
 
-
 //simplified versions
 int32_t isprintf(char *str, const char *format, ...)
 {