ctype.h

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#ifndef CTYPE_H
#define CTYPE_H
 
static inline int isspace(int c)
{
        switch (c) {
        case ' ': case '\f': case '\n':
        case '\r': case '\t': case '\v':
                return 1;
        default:
                return 0;
        }
}
 
static inline int isprint(int c)
{
        return c >= ' ' && c <= '~';
}
 
static inline int isdigit(int c)
{
        return (c >= '0' && c <= '9');
}
 
static inline int isxdigit(int c)
{
        return ((c >= '0' && c <= '9') ||
                (c >= 'a' && c <= 'f') ||
                (c >= 'A' && c <= 'F'));
}
 
static inline int isupper(int c)
{
        return (c >= 'A' && c <= 'Z');
}
 
static inline int islower(int c)
{
        return (c >= 'a' && c <= 'z');
}
 
static inline int toupper(int c)
{
        if (islower(c))
                c -= 'a'-'A';
        return c;
}
 
static inline int tolower(int c)
{
        if (isupper(c))
                c -= 'A'-'a';
        return c;
}
 
#endif /* CTYPE_H */