lzutao b790439e28 Cast arguments to ut8 when feeding ctype.h functions ##refactor
The behavior of the `<ctype.h>` functions is undefined for negative
arguments (other than `EOF`). In such a situation, the argument should
be cast to `unsiged char` for safety.

References:
 - C Programming: A Modern Approach, 2nd Edition: page 612, chapter 23.5
2018-11-06 13:40:00 +01:00
..
2018-09-03 10:07:28 +02:00