strw_hex_lng.c

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/* hexw$ routine for long long's */

#include "fb.h"

static FB_WCHAR hex_table[16] = {_LC('0'),_LC('1'),_LC('2'),_LC('3'),
                                                                 _LC('4'),_LC('5'),_LC('6'),_LC('7'),
                                                                 _LC('8'),_LC('9'),_LC('A'),_LC('B'),
                                                                 _LC('C'),_LC('D'),_LC('E'),_LC('F')};

FBCALL FB_WCHAR *fb_WstrHexEx_l ( unsigned long long num, int digits )
{
        FB_WCHAR *s;
        int i;
        unsigned long long num2;

        if( digits <= 0 ) {
                /* Only use the minimum amount of digits needed; need to count
                   the important 4-bit (base 16) chunks in the number.
                   And if it's zero, use 1 digit for 1 zero. */
                digits = 0;
                num2 = num;
                while( num2 ) {
                        digits += 1;
                        num2 >>= 4;
                }
                if( digits == 0 )
                        digits = 1;
        }

        s = fb_wstr_AllocTemp( digits );
        if( s == NULL )
                return NULL;

        i = digits - 1;
        while( i >= 0 ) {
                s[i] = hex_table[num & 0xF];
                num >>= 4;
                i -= 1;
        }

        s[digits] = _LC('\0');
        return s;
}

FBCALL FB_WCHAR *fb_WstrHex_l ( unsigned long long num )
{
        return fb_WstrHexEx_l( num, 0 );
}