windows-server-2003/base/crts/crtw32/convert/wchtodig.c

/***
*wchtodig.c - Contains _wchartodigit function
*
*       Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       _wchartodigit - convert wchar_t character to digit
*
*Revision History:
*       08-01-00  GB    Module Created
*
*******************************************************************************/

#include <wchar.h>

/***
*_wchartodigit(wchar_t) converts unicode character to it's corrosponding digit
*
*Purpose:
*   Convert unicode character to it's corrosponding digit
*
*Entry:
*   ch char to convert
*
*Exit:
*   good result: int 0-9
*
*   bad result: -1
*
*Exceptions:
*
*******************************************************************************/

int _wchartodigit(wchar_t ch)
{
#define DIGIT_RANGE_TEST(zero)  \
    if (ch < zero)              \
        return -1;              \
    if (ch < zero + 10)         \
    {                           \
        return ch - zero;       \
    }

    DIGIT_RANGE_TEST(0x0030)        // 0030;DIGIT ZERO
    if (ch < 0xFF10)                // FF10;FULLWIDTH DIGIT ZERO
    {
        DIGIT_RANGE_TEST(0x0660)    // 0660;ARABIC-INDIC DIGIT ZERO
        DIGIT_RANGE_TEST(0x06F0)    // 06F0;EXTENDED ARABIC-INDIC DIGIT ZERO
        DIGIT_RANGE_TEST(0x0966)    // 0966;DEVANAGARI DIGIT ZERO
        DIGIT_RANGE_TEST(0x09E6)    // 09E6;BENGALI DIGIT ZERO
        DIGIT_RANGE_TEST(0x0A66)    // 0A66;GURMUKHI DIGIT ZERO
        DIGIT_RANGE_TEST(0x0AE6)    // 0AE6;GUJARATI DIGIT ZERO
        DIGIT_RANGE_TEST(0x0B66)    // 0B66;ORIYA DIGIT ZERO
        DIGIT_RANGE_TEST(0x0C66)    // 0C66;TELUGU DIGIT ZERO
        DIGIT_RANGE_TEST(0x0CE6)    // 0CE6;KANNADA DIGIT ZERO
        DIGIT_RANGE_TEST(0x0D66)    // 0D66;MALAYALAM DIGIT ZERO
        DIGIT_RANGE_TEST(0x0E50)    // 0E50;THAI DIGIT ZERO
        DIGIT_RANGE_TEST(0x0ED0)    // 0ED0;LAO DIGIT ZERO
        DIGIT_RANGE_TEST(0x0F20)    // 0F20;TIBETAN DIGIT ZERO
        DIGIT_RANGE_TEST(0x1040)    // 1040;MYANMAR DIGIT ZERO
        DIGIT_RANGE_TEST(0x17E0)    // 17E0;KHMER DIGIT ZERO
        DIGIT_RANGE_TEST(0x1810)    // 1810;MONGOLIAN DIGIT ZERO


        return -1;
    }
#undef DIGIT_RANGE_TEST

                                    // FF10;FULLWIDTH DIGIT ZERO
    if (ch < 0xFF10 + 10) 
    { 
        return ch - 0xFF10; 
    }
    return -1;

}