src/include/ctype.h

   1 #ifndef _CTYPE_H
   2 #define _CTYPE_H
   3
   4 /** @file
   5  *
   6  * Character types
   7  */
   8
   9 #define isdigit(c)      ((c) >= '0' && (c) <= '9')
  10 #define islower(c)      ((c) >= 'a' && (c) <= 'z')
  11 #define isupper(c)      ((c) >= 'A' && (c) <= 'Z')
  12
  13 static inline unsigned char tolower(unsigned char c)
  14 {
  15         if (isupper(c))
  16                 c -= 'A'-'a';
  17         return c;
  18 }
  19
  20 static inline unsigned char toupper(unsigned char c)
  21 {
  22         if (islower(c))
  23                 c -= 'a'-'A';
  24         return c;
  25 }
  26
  27 #endif /* _CTYPE_H */