+XBT_PUBLIC(long int) xbt_str_parse_int(const char* str, const char* error_msg);
+XBT_PUBLIC(double) xbt_str_parse_double(const char* str, const char* error_msg);
+
+#define DJB2_HASH_FUNCTION
+//#define FNV_HASH_FUNCTION
+
+/**
+ * @brief Returns the hash code of a string.
+ */
+static XBT_INLINE unsigned int xbt_str_hash_ext(const char *str, int str_len)
+{
+
+#ifdef DJB2_HASH_FUNCTION
+ /* fast implementation of djb2 algorithm */
+ int c;
+ unsigned int hash = 5381;
+
+ while (str_len--) {
+ c = *str++;
+ hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
+ }
+# elif defined(FNV_HASH_FUNCTION)
+ unsigned int hash = 0x811c9dc5;
+ unsigned char *bp = (unsigned char *) str; /* start of buffer */
+ unsigned char *be = bp + str_len; /* beyond end of buffer */
+
+ while (bp < be) {
+ /* multiply by the 32 bit FNV magic prime mod 2^32 */
+ hash +=
+ (hash << 1) + (hash << 4) + (hash << 7) + (hash << 8) +
+ (hash << 24);
+
+ /* xor the bottom with the current octet */
+ hash ^= (unsigned int) *bp++;
+ }
+
+# else
+ unsigned int hash = 0;
+
+ while (str_len--) {
+ hash += (*str) * (*str);
+ str++;
+ }
+#endif
+
+ return hash;
+}
+
+/**
+ * @brief Returns the hash code of a string.