ctype.h

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#ifndef MSL_CTYPE_H
#define MSL_CTYPE_H
 
extern const unsigned char __ctype_map[];
extern const unsigned char __lower_map[];
extern const unsigned char __upper_map[];
 
#define EOF -1L
#define __control_char 0x01
#define __motion_char 0x02
#define __space_char 0x04
#define __punctuation 0x08
#define __digit 0x10
#define __hex_digit 0x20
#define __lower_case 0x40
#define __upper_case 0x80
 
#define __letter (__lower_case | __upper_case)
#define __alphanumeric (__letter | __digit)
#define __graphic (__alphanumeric | __punctuation)
#define __printable (__graphic | __space_char)
#define __whitespace (__motion_char | __space_char)
#define __control (__motion_char | __control_char)
#define __zero_fill(c) ((int) (unsigned char) (c))
 
static inline int isalpha(int c)
{
    return (int) (__ctype_map[(unsigned char) c] & __letter);
}
static inline int isdigit(int c)
{
    return (int) (__ctype_map[(unsigned char) c] & __digit);
}
static inline int isspace(int c)
{
    return (int) (__ctype_map[(unsigned char) c] & __whitespace);
}
static inline int isupper(int c)
{
    return (int) (__ctype_map[(unsigned char) c] & __upper_case);
}
static inline int isxdigit(int c)
{
    return (int) (__ctype_map[(unsigned char) c] & __hex_digit);
}
 
int toupper(int c);
int tolower(int c);
 
#endif