Use strlen() rather than fixed length in fast_atof.h

This avoids reading past the length of the input string.

include/assimp/fast_atof.h

@@ -194,7 +194,7 @@ uint64_t strtoul10_64( const char* in, const char** out=0, unsigned int* max_ino
 
     if ( *in < '0' || *in > '9' ) {
         // The string is known to be bad, so don't risk printing the whole thing.
-        throw ExceptionType("The string \"", ai_str_toprintable(in, 30), "\" cannot be converted into a value." );
+        throw ExceptionType("The string \"", ai_str_toprintable(in, (int)strlen(in)), "\" cannot be converted into a value." );
     }
 
     for ( ;; ) {
@@ -294,7 +294,7 @@ const char* fast_atoreal_move(const char* c, Real& out, bool check_comma = true)
     if (!(c[0] >= '0' && c[0] <= '9') &&
             !((c[0] == '.' || (check_comma && c[0] == ',')) && c[1] >= '0' && c[1] <= '9')) {
         // The string is known to be bad, so don't risk printing the whole thing.
-        throw ExceptionType("Cannot parse string \"", ai_str_toprintable(c, 30),
+        throw ExceptionType("Cannot parse string \"", ai_str_toprintable(c, (int)strlen(c)),
                                     "\" as a real number: does not start with digit "
                                     "or decimal point followed by digit.");
     }