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- #ifndef _CTYPE_H
- #define _CTYPE_H
-
- /** @file
- *
- * Character types
- */
-
- #define isdigit(c) ((c) >= '0' && (c) <= '9')
- #define islower(c) ((c) >= 'a' && (c) <= 'z')
- #define isupper(c) ((c) >= 'A' && (c) <= 'Z')
-
- static inline unsigned char tolower(unsigned char c)
- {
- if (isupper(c))
- c -= 'A'-'a';
- return c;
- }
-
- static inline unsigned char toupper(unsigned char c)
- {
- if (islower(c))
- c -= 'a'-'A';
- return c;
- }
-
- #endif /* _CTYPE_H */
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