CTYPE_BITS.cpp

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// checking for ctype constants
 
 
#include <ctype.h>
#include <stdio.h>
 
 
int main ()
{
    struct {
        const char* name;
        int         val;
    } bits[] = {
 
        {
            "UPPER",
#if defined (_ISUPPER)
            _ISUPPER
#elif defined (_ISupper)
            _ISupper
#elif defined (_U)
            _U
#elif defined (__GLIBC__)
            _ISupper,
#else
            -1
#endif
        },
 
        {
            "LOWER",
#if defined (_ISLOWER)
            _ISLOWER
#elif defined (_ISlower)
            _ISlower
#elif defined (_L)
            _L
#elif defined (__GLIBC__)
            _ISlower,
#else
            -1
#endif
        },
 
        {
            "DIGIT",
#if defined (_ISDIGIT)
            _ISDIGIT
#elif defined (_ISdigit)
            _ISdigit
#elif defined (_D)
            _D
#elif defined (__GLIBC__)
            _ISdigit,
#else
            -1
#endif
        },
 
        {
            "SPACE",
#if defined (_ISSPACE)
            _ISSPACE
#elif defined (_ISspace)
            _ISspace
#elif defined (_S)
            _S
#elif defined (__GLIBC__)
            _ISspace,
#else
            -1
#endif
        },
 
        {
            "PUNCT",
#if defined (_ISPUNCT)
            _ISPUNCT
#elif defined (_ISpunct)
            _ISpunct
#elif defined (_P)
            _P
#elif defined (__GLIBC__)
            _ISpunct,
#else
            -1
#endif
        },
 
        {
            "CNTRL",
#if defined (_ISCNTRL)
            _ISCNTRL
#elif defined (_IScntrl)
            _IScntrl
#elif defined (_C)
            _C
#elif defined (__GLIBC__)
            _IScntrl,
#else
            -1
#endif
        },
 
        {
            "BLANK",
#if defined (_ISBLANK)
            _ISBLANK
#elif defined (_ISblank)
            _ISblank
#elif defined (_B)
            _B
#elif defined (__GLIBC__)
            _ISblank,
#else
            -1
#endif
        },
 
        {
            "XDIGIT",
#if defined (_ISXDIGIT)
            _ISXDIGIT
#elif defined (_ISxdigit)
            _ISxdigit
#elif defined (_X)
            _X
#elif defined (__GLIBC__)
            _ISxdigit,
#else
            -1
#endif
        },
 
        {
            "GRAPH",
#if defined (_ISGRAPH)
            _ISGRAPH
#elif defined (_ISgraph)
            _ISgraph
#elif defined (__GLIBC__)
            _ISgraph,
#else
            -1
#endif
        },
 
        {
            "ALPHA",
#if defined (_ISALPHA)
            _ISALPHA
#elif defined (_ISalpha)
            _ISalpha
#elif defined (__GLIBC__)
            _ISalpha,
#else
            -1
#endif
        },
 
        {
            "PRINT",
#if defined (_ISPRINT)
            _ISPRINT
#elif defined (_ISprint)
            _ISprint
#elif defined (__GLIBC__)
            _ISprint,
#else
            -1
#endif
        },
 
        {
            "ALNUM",
#if defined (_ISALNUM)
            _ISALNUM
#elif defined (_ISalnum)
            _ISalnum
#elif defined (__GLIBC__)
            _ISalnum,
#else
            -1
#endif
        }
    };
 
    int used = 0;
 
    for (unsigned i = 0; i != sizeof bits / sizeof *bits; ++i) {
 
        if (-1 != bits [i].val) {
            used |= bits [i].val;
 
            printf ("#define _RWSTD_CTYPE_%s %#010x"
                    "   /* libc value */\n",
                    bits [i].name, bits [i].val);
        }
    }
 
    for (unsigned j = 0; j != sizeof bits / sizeof *bits; ++j) {
        if (-1 == bits [j].val) {
            for (unsigned i = 0; i != sizeof used * 8; ++i) {
                if (!(used & (1 << i))) {
 
                    used |= 1 << i;
 
                    printf ("#define _RWSTD_CTYPE_%s %#010x"
                            "   /* computed */\n",
                            bits [j].name, 1 << i);
 
                    break;
                }
            }
        }
    }
 
    return 0;
}