Correct names and fix declaration issues

cStuff/string.c

@@ -13,6 +13,10 @@
  * @see https://lowenware.com/
  */
 
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
 
 #include "string.h"
 
@@ -86,13 +90,13 @@ cstuff_vsprintf(char **out, const char *format, va_list args)
 	char tmp, *s;
 
 	va_copy(vc, args);
-	result = vsprintf(&tmp, 1, format, vc);
+	result = vsnprintf(&tmp, 1, format, vc);
 	va_end(vc);
 
 	if (!(s = malloc(result + 1)))
 		return -1;
 
-	result = vsprintf(s, result+1, format, args); 
+	result = vsnprintf(s, result+1, format, args); 
 
 	return result;
 }

cStuff/string.h

@@ -16,7 +16,6 @@
 #ifndef CSTUFF_STRING_H_938B242C_B750_40E9_8B67_A69F2F37EB87
 #define CSTUFF_STRING_H_938B242C_B750_40E9_8B67_A69F2F37EB87
 
-#include <string.h>
 #include <stdarg.h>
 #include "retcode.h"
 
@@ -43,6 +42,10 @@ int
 cstuff_strset(char **out, const char *in);
 
 
+int
+cstuff_strnset(char **out, const char *in, int len);
+
+
 /** @brief Allocates memory and prints a formatted string into it
  *  @param out a pointer to an address where new string must be stored
  *  @param format a format for string (see manual for stdlib sprintf)