strw_convfrom_rad.c

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#include "fb.h"

FBCALL int fb_WstrRadix2Int( const FB_WCHAR *src, ssize_t len, int radix )
{
        int c, v;

        v = 0;

        switch( radix )
        {
                /* hex */
                case 16:
                        while( --len >= 0 )
                        {
                                c = *src++;
                                if( (c >= 97) && (c <= 102) )
                                        c -= 87;
                                else if( (c >= 65) && (c <= 70) )
                                        c -= 55;
                                else if( (c >= 48) && (c <= 57) )
                                        c -= 48;
                                else
                                        break;
                                
                                v = (v * 16) + c;
                        }
                        break;

                /* oct */
                case 8:
                        while( --len >= 0 ) {
                                c = *src++;
                                if( (c >= 48) && (c <= 55) )
                                        v = (v * 8) + (c - 48);
                                else
                                        break;
                        }
                        break;

                /* bin */
                case 2:
                        while( --len >= 0 ) {
                                c = *src++;
                                if( (c >= 48) && (c <= 49) )
                                        v = (v * 2) + (c - 48);
                                else
                                        break;
                        }
                        break;
        }

        return v;
}