/* format function */

#include "fb.h"
#include <math.h>

typedef enum _eMaskType {
    eMT_Unknown = 0,
    eMT_Number,
    eMT_DateTime
} eMaskType;

typedef struct _FormatMaskInfo {
    eMaskType mask_type;

    int has_decimal_point;
    int has_thousand_sep;
    int has_percent;
    int has_exponent;
    int exponent_add_plus;
    int has_sign;
    int sign_add_plus;
    int num_digits_fix;
    int num_digits_frac;
    int num_digits_omit;
    int exp_digits;

    int has_ampm;

    ssize_t length_min;
    ssize_t length_opt;
} FormatMaskInfo;

#define FB_MAXFIXLEN 19 /* floor( log10( pow( 2.0, 64 ) ) ) */

/** Splits a number into its fixed and fractional part.
 *
 * precision        info
 * 11               VBDOS' default floating point precision for FORMAT$()
 *                  when no mask was specified
 * 16               Precision when the user specified a mask
 */
static
void fb_hGetNumberParts
	(
		double number,
		char *pachFixPart,
		ssize_t *pcchLenFix,
		char *pachFracPart,
		ssize_t *pcchLenFrac,
        char *pchSign,
        char chDecimalPoint,
        int precision
	)
{
    char *pszFracStart, *pszFracEnd;
    char chSign;
    double dblFix;
    double dblFrac = modf( number, &dblFix );
    int neg = (number < 0.0);
    unsigned long long ullFix = (unsigned long long) (neg ? -dblFix : dblFix);
    ssize_t len_fix, len_frac;

    /* make fractional part positive */
    if( dblFrac < 0.0 )
        dblFrac = -dblFrac;

    /* Store fractional part of number into buffer */
    len_frac = sprintf( pachFracPart, "%.*f", precision, dblFrac );

    /* Remove trailing zeroes and - if it completely consists of zeroes -
     * also remove the decimal point */
    pszFracStart = pachFracPart;
    if( *pszFracStart=='-' )
        ++pszFracStart;       /* Required for -0.0 value */
    ++pszFracStart;
    pszFracEnd = pachFracPart + len_frac;
    while( pszFracEnd!=pszFracStart ) {
        --pszFracEnd;
        if( *pszFracEnd!='0' ) {
            if( *pszFracEnd!=chDecimalPoint ) {
                ++pszFracStart;
                ++pszFracEnd;
            }
            break;
        }
    }

    /* Move usable fractional part of number to begin of buffer */
    len_frac = pszFracEnd - pszFracStart;
    memmove( pachFracPart, pszFracStart, len_frac );
    pachFracPart[len_frac] = 0;

    /* Store fix part of the number into buffer */
    if( ullFix==0 && neg ) {
        pachFixPart[0] = 0;
        len_fix = 0;
        chSign = '-';
    } else if( ullFix==0 && number > 0.0 ) {
        pachFixPart[0] = 0;
        len_fix = 0;
        chSign = '+';
    } else {
        if( neg ) {
            chSign = '-';
        } else if( ullFix > 0 ) {
            chSign = '+';
        } else {
            chSign = '\0';
        }
        len_fix = sprintf( pachFixPart, "%" FB_LL_FMTMOD "u", ullFix );
    }

    if( pcchLenFix!=NULL )
        *pcchLenFix = len_fix;
    if( pcchLenFrac!=NULL )
        *pcchLenFrac = len_frac;
    if( pchSign!=NULL )
        *pchSign = chSign;
}

static
FBSTRING *fb_hBuildDouble
	(
		double num,
        char decimal_point,
        char thousands_separator
	)
{
    char FixPart[128], FracPart[128], chSign;
    ssize_t LenFix, LenFrac, LenSign, LenDecPoint, LenTotal;
    FBSTRING 	*dst;

    fb_hGetNumberParts( num,
                        FixPart, &LenFix,
                        FracPart, &LenFrac,
                        &chSign,
                        '.',
                        11 );

    LenSign = ( ( chSign=='-' ) ? 1 : 0 );
    LenDecPoint = ( ( LenFrac!=0 ) ? 1 : 0 );
    LenTotal = LenSign + LenFix + LenDecPoint + LenFrac;

	/* alloc temp string */
    dst = fb_hStrAllocTemp_NoLock( NULL, LenTotal );
	if( dst != NULL )
	{
        if( LenSign!=0 ) {
            dst->data[0] = chSign;
        }
        FB_MEMCPY( dst->data + LenSign, FixPart, LenFix );
        if( LenDecPoint!=0 ) {
            dst->data[LenSign + LenFix] = decimal_point;
        }
        FB_MEMCPY( dst->data + LenSign + LenFix + LenDecPoint,
                   FracPart,
                   LenFrac );
        dst->data[LenTotal] = 0;
	}
	else
		dst = &__fb_ctx.null_desc;

	return dst;
}

static double hRound
	(
		double value,
		const FormatMaskInfo *pInfo
	)
{
	double fix, frac = modf( value, &fix );

    if( pInfo->num_digits_frac == 0 )
    {
    	/* round it here, because modf() at GetNumParts won't */

    	/* convert to fixed-point because the imprecision and the optimizations
    	   that can be done by gcc (ie: keeping values on fpu stack as twords) */
    	long long int intfrac = (long long int)(frac * 1.E+15);
    	if( intfrac > (long long int)(5.E+14) )
        	value = ceil( value );
		else if( intfrac < -(long long int)(5.E+14) )
        	value = floor( value );
	}
	else
    {
		/* remove the fraction of the fraction to be compatible with
		   VBDOS (ie: 2.55 -> 2.5, not 2.6 as in VB6) */
		if( frac != 0.0 )
		{
	    	double p10 = pow( 10.0, pInfo->num_digits_frac );

	        double fracfrac = modf( frac * p10, &frac );

	        /* convert to fixed-point, see above */
	        long long int intfrac = (long long int)(fracfrac * (1.E+15 / p10) );

	        if( intfrac > (long long int)(5.E+14 / p10) )
	        	frac += 1.0;
	        else if( intfrac < -(long long int)(5.E+14 / p10) )
	        	frac += -1.0;

	        frac /= p10;

	        value = fix + frac;
		}
	}

	return value;
}

/** Processes a FORMAT mask.
 *
 * This function is used for two passes:
 *
 * - Determine the required size of the resulting string.
 * - Build the resulting string.
 *
 * This function is a mess, but hey, it works ...
 *
 * When I've too much time, I'll simplify this function so that almost all
 * queries of do_output will be removed.
 */
static
int fb_hProcessMask
	(
		FBSTRING *dst,
		const char *mask,
		ssize_t mask_length,
        double value,
        FormatMaskInfo *pInfo,
        char chThousandsSep,
        char chDecimalPoint,
        char chDateSep,
        char chTimeSep
	)
{
    char FixPart[128], FracPart[128], ExpPart[128], chSign = 0;
    ssize_t LenFix, LenFrac, LenExp = 0, IndexFix, IndexFrac, IndexExp = 0;
    ssize_t ExpValue, ExpAdjust = 0, NumSkipFix = 0, NumSkipExp = 0;
    int do_skip = FALSE, do_exp = FALSE, do_string = FALSE;
    int did_sign = FALSE, did_exp = FALSE, did_hour = FALSE, did_thousandsep = FALSE;
    int do_num_frac = FALSE, last_was_comma = FALSE, was_k_div = FALSE;
    int do_output = dst!=NULL;
    int do_add = FALSE;
    ssize_t LenOut;
    char *pszOut;
    ssize_t i;

    DBG_ASSERT( pInfo!=NULL );

    if( !do_output ) {
        memset( pInfo, 0, sizeof(FormatMaskInfo) );
        pszOut = NULL;
        LenOut = 0;
    } else {
        if( pInfo->mask_type==eMT_Number ) {
            if( pInfo->has_percent )
                value *= 100.0;
            value /= pow( 10.0, pInfo->num_digits_omit );
        }
        pszOut = dst->data;
        LenOut = FB_STRSIZE( dst );
    }

	if( value != 0.0 )
		ExpValue = (int)floor( log10( fabs( value ) ) ) + 1;
	else
		ExpValue = 0;

    if( do_output )
    {
        if( pInfo->mask_type==eMT_Number )
        {
            /* When output of exponent is required, shift value to the
             * left (* 10^n) as far as possible. "As far as possible" depends
             * on the number of digits required by the number as a textual
             * representation. */

			if( pInfo->has_exponent )
			{
				/* exponent too big? scale (up or down) */
				if( ExpValue <= 0 )
				{
					ExpValue -= pInfo->num_digits_fix;
				}
				else
				{
					if( pInfo->num_digits_frac > 0 )
					{
						if( ExpValue > pInfo->num_digits_fix )
							ExpValue -= pInfo->num_digits_fix;
						else
							ExpValue = 0;
					}
					else
					{
						if( ExpValue > FB_MAXFIXLEN )
							ExpValue -= FB_MAXFIXLEN;
						else
							ExpValue = 0;
					}
				}

				if( ExpValue != 0 )
				{
					if( -ExpValue <= 308 )
					{
						value *= pow( 10.0, -ExpValue );
					}
					else
					{
						value *= pow( 5.0, -ExpValue );
						value *= pow( 2.0, -ExpValue );
					}
				}

				LenExp = sprintf( ExpPart, "%d", (int)ExpValue );

	            if( ExpValue < 0 )
					IndexExp = ExpAdjust = 1;
				else
					IndexExp = ExpAdjust = 0;

				NumSkipExp = pInfo->exp_digits - ( LenExp - ExpAdjust );
			}
			/* value between (+|-)0.0..1.0 */
			else if( ExpValue < 0 )
			{
				/* too small? */
				if( -ExpValue >= pInfo->num_digits_frac )
				{
#if 0
					/* can't scale? */
					if( (pInfo->num_digits_frac == 0 ) ||
						(-ExpValue > pInfo->num_digits_fix +
									 pInfo->num_digits_frac -
									 pInfo->num_digits_omit) )
						value = 0.0;
					else
						value *= pow( 10.0, -ExpValue + pInfo->num_digits_fix );
#else
					value = 0.0;
#endif
					ExpValue = 0;
				}

			}
			/* value is 0.0 or (+|-)1.0... */
			else
			{
				/* too big to fit on a long long? */
				if( ExpValue > FB_MAXFIXLEN )
				{
					ExpValue -= FB_MAXFIXLEN;
					value *= pow( 10.0, -ExpValue );
				}
				else
					ExpValue = 0;
			}

			value = hRound( value, pInfo );

			/* value rounded up to next power of 10? */
			if( pInfo->has_exponent && (fb_IntLog10_64( (unsigned long long)fabs( value ) ) == pInfo->num_digits_fix) )
			{
				value /= 10.0;
				ExpValue += 1;
				LenExp = sprintf( ExpPart, "%d", (int)ExpValue );
				if( ExpValue < 0 )
					IndexExp = ExpAdjust = 1;
				else
					IndexExp = ExpAdjust = 0;

				NumSkipExp = pInfo->exp_digits - ( LenExp - ExpAdjust );
			}

			fb_hGetNumberParts( value,
            					FixPart, &LenFix,
                                FracPart, &LenFrac,
                                &chSign,
                                '.',
                                pInfo->num_digits_frac );


			/* handle too big numbers */
			if( (ExpValue > 0) && !pInfo->has_exponent )
			{
				int i;
				for( i = 0; i < ExpValue; i++ )
					FixPart[LenFix+i] = '0';

				LenFix += ExpValue;

				FixPart[LenFix] = '\0';
			}

			/* Number of digits to skip on output */
            NumSkipFix = pInfo->num_digits_fix - LenFix;

        }
    }
    else
    {
		/* just assume the max possible */
		LenFix = (ExpValue > FB_MAXFIXLEN? ExpValue : FB_MAXFIXLEN);
		LenFrac = 0;
    }

    IndexFix = IndexFrac = 0;
    for( i=0; i!=mask_length; ++i ) {
        const char *pszAdd = mask + i;
        char *pszAddFree = NULL;
        int LenAdd = 1;
        char chCurrent = *pszAdd;
        if( do_skip ) {
            do_skip = FALSE;
            if( !do_output ) {
                ++pInfo->length_min;
            } else {
                do_add = TRUE;
            }
        } else if( do_exp ) {
            if( !do_output ) {
                pInfo->has_exponent = TRUE;
                switch( chCurrent ) {
                case '-':
                    pInfo->exponent_add_plus = FALSE;
                    ++pInfo->length_opt;
                    break;
                case '+':
                    pInfo->exponent_add_plus = TRUE;
                    ++pInfo->length_min;
                    break;
                default:
                    fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
                    return FALSE;
                }
            } else {
                if( pInfo->exponent_add_plus || ExpValue<0 ) {
                    if( ExpValue < 0 ) {
                        pszAdd = "-";
                    } else {
                        pszAdd = "+";
                    }
                    do_add = TRUE;
                }
            }
            do_exp = FALSE;
            did_exp = TRUE;
            do_num_frac = FALSE;
        } else if( do_string ) {
            if( chCurrent=='"' ) {
                do_string = FALSE;
            } else if( !do_output ) {
                ++pInfo->length_min;
            } else {
                do_add = TRUE;
            }
        } else {
            if( do_output ) {
                switch (chCurrent ) {
                case '.':
                case '#':
                case '0':
                    if( !pInfo->has_sign && !did_sign ) {
                        did_sign = TRUE;
                        if( pInfo->sign_add_plus || chSign=='-' ) {
                            pszAdd = &chSign;
                            do_add = TRUE;
                        } else {
                            --i;
                            continue;
                        }
                    } else if( NumSkipFix < 0 ) {
                        DBG_ASSERT( IndexFix!=LenFix );
                        pszAdd = FixPart + IndexFix;
                        if( pInfo->has_thousand_sep ) {
                            int remaining = LenFix - IndexFix;
                            if( IndexFix != LenFix && (remaining % 3)==0 ) {
                                if( did_thousandsep ) {
                                    did_thousandsep = FALSE;
                                    LenAdd = 3;
                                } else {
                                    if( IndexFix >= 1 ) {
                                        did_thousandsep = TRUE;
                                        pszAdd = &chThousandsSep;
                                        LenAdd = 1;
                                    }
                                }
                            } else {
                                LenAdd = remaining % 3;
                            }
                        } else {
                            LenAdd = -NumSkipFix;
                        }
                        do_add = TRUE;
                        if( !did_thousandsep ) {
                            IndexFix += LenAdd;
                            NumSkipFix += LenAdd;
                        }
                    }
                    break;
                }
                if( do_add )
                    --i;
            }

            if( !do_add ) {
                switch( chCurrent ) {
                case '%':
                case ',':
                case '#':
                case '0':
                case '+':
                case 'E':
                case 'e':
                    if( pInfo->mask_type==eMT_Unknown ) {
                        pInfo->mask_type = eMT_Number;
#if 0
                    } else if( pInfo->mask_type!=eMT_Number ) {
                        fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
                        return FALSE;
#endif
                    }
                    break;
                case '-':
                case '.':
                    if( pInfo->mask_type==eMT_Unknown ) {
                        pInfo->mask_type = eMT_Number;
                    }
                    break;
                case 'd':
                case 'n':
                case 'm':
                case 'M':
                case 'y':
                case 'h':
                case 'H':
                case 's':
                case 't':
                case ':':
                case '/':
                    if( pInfo->mask_type==eMT_Unknown ) {
                        pInfo->mask_type = eMT_DateTime;
#if 0
                    } else if( pInfo->mask_type!=eMT_DateTime ) {
                        fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
                        return FALSE;
#endif
                    }
                    break;
                }


                /* Here comes the real interpretation */
                switch( chCurrent ) {
                case '%':
                    if( !do_output ) {
                        if( pInfo->mask_type==eMT_Number ) {
                            if( !pInfo->has_percent ) {
                                pInfo->has_percent = TRUE;
                                ++pInfo->length_min;
                            } else {
                                fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
                                return FALSE;
                            }
                        } else {
                            ++pInfo->length_min;
                        }
                    } else {
                        do_add = TRUE;
                    }
                    break;
                case '.':
                    if( !do_output ) {
                        if( pInfo->mask_type==eMT_Number ) {
                            if( !pInfo->has_decimal_point ) {
                                pInfo->has_decimal_point = TRUE;
                                if( last_was_comma ) {
                                    pInfo->num_digits_omit += 3;
                                    was_k_div = TRUE;
                                } else if( pInfo->num_digits_omit!=0 ) {
                                    pInfo->num_digits_omit += 3;
                                }
                            }
                        }
                        ++pInfo->length_min;
                    } else {
                        do_add = TRUE;
                        if( pInfo->mask_type==eMT_Number ) {
                            pszAdd = &chDecimalPoint;
                        }
                    }
                    do_num_frac = TRUE;
                    break;
                case ',':
                    if( !do_output ) {
                        if( pInfo->mask_type==eMT_Number ) {
                            if( last_was_comma ) {
                                pInfo->num_digits_omit += 3;
                                was_k_div = TRUE;
                            }
                            last_was_comma = TRUE;
                        } else {
                            ++pInfo->length_min;
                        }
                    } else {
                        if( pInfo->mask_type==eMT_Number ) {
                            if( last_was_comma ) {
                                was_k_div = TRUE;
                            }
                            last_was_comma = TRUE;
                        } else {
                            do_add = TRUE;
                        }
                    }
                    break;
                case '#':
                case '0':
                    if( !do_output ) {
                        if( pInfo->mask_type==eMT_Number ) {
                            if( do_num_frac ) {
                                ++pInfo->num_digits_frac;
                            } else if( did_exp ) {
                                ++pInfo->exp_digits;
                            } else {
                                ++pInfo->num_digits_fix;
                            }
                            if( chCurrent=='#' ) {
                                ++pInfo->length_opt;
                            } else {
                                ++pInfo->length_min;
                            }
                        } else {
                            ++pInfo->length_min;
                        }
                    } else {
                        if( pInfo->mask_type==eMT_Number ) {
                            if( do_num_frac ) {
                                if( IndexFrac!=LenFrac ) {
                                    pszAdd = FracPart + IndexFrac++;
                                    do_add = TRUE;
                                } else if( chCurrent=='0' ) {
                                    do_add = TRUE;
                                }
                            } else if( did_exp ) {
                                if( NumSkipExp > 0 ) {
                                    if( chCurrent=='0' ) {
                                        do_add = TRUE;
                                    }
                                    --NumSkipExp;
                                } else if( IndexExp!=LenExp ) {
                                    pszAdd = ExpPart + IndexExp++;
                                    if( (IndexExp-ExpAdjust)>=pInfo->exp_digits
                                        && ( IndexExp!=LenExp ) )
                                    {
                                        --i;
                                    }
                                    do_add = TRUE;
                                } else {
                                    DBG_ASSERT( FALSE );
                                }

                            } else {
                                if( pInfo->has_thousand_sep ) {
                                    int remaining = LenFix - IndexFix + NumSkipFix;
                                    if( (remaining % 3)==0 ) {
                                        if( did_thousandsep ) {
                                            did_thousandsep = FALSE;
                                        } else {
                                            if( NumSkipFix==0 && IndexFix!=0 ) {
                                                did_thousandsep = TRUE;
                                                pszAdd = &chThousandsSep;
                                                LenAdd = 1;
                                                do_add = TRUE;
                                                --i;
                                            }
                                        }
                                    }
                                }

                                if( !do_add ) {
                                    if( NumSkipFix ) {
                                        if( chCurrent=='0' )
                                            do_add = TRUE;
                                        --NumSkipFix;
                                    } else {
                                        if( IndexFix!=LenFix ) {
                                            pszAdd = FixPart + IndexFix++;
                                            do_add = TRUE;
                                        } else if( chCurrent=='0' ) {
                                            do_add = TRUE;
                                        }
                                    }
                                }
                            }
                        } else {
                            do_add = TRUE;
                        }
                    }
                    break;
                case 'E':
                case 'e':
                    if( pInfo->mask_type==eMT_Number ) {
                        if( !did_exp ) {
                            do_exp = TRUE;
                            if( !do_output ) {
                                ++pInfo->length_min;
                            } else {
                                do_add = TRUE;
                            }
                        } else {
                            fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
                            return FALSE;
                        }
                    } else {
                        if( !do_output ) {
                            ++pInfo->length_min;
                        } else {
                            do_add = TRUE;
                        }
                    }
                    break;
                case '\\':
                    do_skip = TRUE;
                    break;
                case '*':
                case '$':
                case '(':
                case ')':
                case ' ':
                case '\t':
                    if( !do_output ) {
                        ++pInfo->length_min;
                    } else {
                        do_add = TRUE;
                    }
                    break;
                case '+':
                case '-':
                    /* position of the sign? */
                    if( !do_output ) {
                        ++pInfo->length_min;
                        if( !pInfo->has_sign ) {
                            pInfo->has_sign = TRUE;
                            pInfo->sign_add_plus = chCurrent=='+';
                        }
                    } else {
                        if( pInfo->mask_type == eMT_DateTime ) {
                            do_add = TRUE;
                        } else if( !did_sign ) {
                            did_sign = TRUE;
                            if( pInfo->sign_add_plus || chSign=='-' ) {
                                pszAdd = &chSign;
                                do_add = TRUE;
                            }
                        } else {
                            do_add = TRUE;
                        }
                    }
                    break;
                case 'd':
                    /* day */
                case 'm':
                    /* minute or month */
                case 'n':
                    /* minute */
                case 'M':
                    /* month */
                case 'y':
                    /* year */
                case 'h':
                case 'H':
                    /* hour */
                case 's':
                    /* second */
                case 't':
                    /* complete short time */
                    if( pInfo->mask_type==eMT_DateTime ) {
                        int old_did_hour = did_hour;
                        int count = 1;
                        while( mask[i+count]==chCurrent )
                            ++count;
                        did_hour = FALSE;
                        if( chCurrent=='m' ) {
                            if( count>2 || !old_did_hour ) {
                                chCurrent = 'M';
                            }
                        }
                        if( chCurrent=='t' && count==5 ) {
                            FBSTRING *tmp;
                            i += count-1;
                            fb_IntlGetTimeFormat( FixPart, sizeof(FixPart), FALSE );
                            tmp = fb_hStrFormat ( value,
                                                  FixPart,
                                                  strlen(FixPart) );
                            if( !do_output ) {
                                pInfo->length_min += FB_STRSIZE(tmp);
                            } else {
                                pszAddFree = strdup( tmp->data );
                                LenAdd = FB_STRSIZE( tmp );
                                do_add = TRUE;
                            }
                            fb_hStrDelTemp( tmp );
                        } else if( chCurrent=='t' && (count==1 || count==2) ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += count;
                                pInfo->has_ampm = TRUE;
                            } else {
                                int hour = fb_Hour( value );
                                if( hour >= 12 ) {
                                    pszAdd = "PM";
                                } else {
                                    pszAdd = "AM";
                                }
                                LenAdd = count;
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='d' && count==5 ) {
                            FBSTRING *tmp;
                            i += count-1;
                            fb_IntlGetDateFormat( FixPart, sizeof(FixPart), FALSE );
                            tmp = fb_hStrFormat ( value,
                                                  FixPart,
                                                  strlen(FixPart) );
                            if( !do_output ) {
                                pInfo->length_min += FB_STRSIZE(tmp);
                            } else {
                                pszAddFree = strdup( tmp->data );
                                LenAdd = FB_STRSIZE( tmp );
                                do_add = TRUE;
                            }
                            fb_hStrDelTemp( tmp );
                        } else if( chCurrent=='d' && count==1 ) {
                            i += count-1;
                            if( !do_output ) {
                                ++pInfo->length_min;
                                ++pInfo->length_opt;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%d",
                                                  fb_Day( value ) );
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='d' && count==2 ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += 2;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%02d",
                                                  fb_Day( value ) );
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='d' && (count==3 || count==4) ) {
                            int weekday = fb_Weekday( value, FB_WEEK_DAY_SUNDAY );
                            FBSTRING *tmp = fb_WeekdayName( weekday, (count==3), FB_WEEK_DAY_SUNDAY );
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += FB_STRSIZE( tmp );
                            } else {
                                pszAddFree = strdup( tmp->data );
                                LenAdd = 0;
                                do_add = TRUE;
                            }
                            fb_hStrDelTemp( tmp );
                        } else if( (chCurrent=='m' || chCurrent == 'n') && count==1 ) {
                            i += count-1;
                            if( !do_output ) {
                                ++pInfo->length_min;
                                ++pInfo->length_opt;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%d",
                                                  fb_Minute( value ) );
                                do_add = TRUE;
                            }
                        } else if( (chCurrent=='m' || chCurrent == 'n') && count==2 ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += 2;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%02d",
                                                  fb_Minute( value ) );
                                do_add = TRUE;
                            }
                        } else if( (chCurrent=='h' || chCurrent=='H') && count==1 ) {
                            i += count-1;
                            if( !do_output ) {
                                ++pInfo->length_min;
                                ++pInfo->length_opt;
                            } else {
                                int hour = fb_Hour( value );
                                if( pInfo->has_ampm && chCurrent=='h') {
                                    if( hour > 12 ) {
                                        hour -= 12;
                                    } else if( hour==0 ) {
                                        hour += 12;
                                    }
                                }
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%d",
                                                  hour );
                                do_add = TRUE;
                            }
                            did_hour = TRUE;
                        } else if( (chCurrent=='h' || chCurrent=='H') && count==2 ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += 2;
                            } else {
                                int hour = fb_Hour( value );
                                if( pInfo->has_ampm && chCurrent=='h' ) {
                                    if( hour > 12 ) {
                                        hour -= 12;
                                    } else if( hour==0 ) {
                                        hour += 12;
                                    }
                                }
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%02d",
                                                  hour );
                                do_add = TRUE;
                            }
                            did_hour = TRUE;
                        } else if( chCurrent=='s' && count==1 ) {
                            i += count-1;
                            if( !do_output ) {
                                ++pInfo->length_min;
                                ++pInfo->length_opt;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%d",
                                                  fb_Second( value ) );
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='s' && count==2 ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += 2;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%02d",
                                                  fb_Second( value ) );
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='M' && count==1 ) {
                            i += count-1;
                            if( !do_output ) {
                                ++pInfo->length_min;
                                ++pInfo->length_opt;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%d",
                                                  fb_Month( value ) );
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='M' && count==2 ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += 2;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%02d",
                                                  fb_Month( value ) );
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='M' && (count==3 || count==4) ) {
                            int month = fb_Month( value );
                            FBSTRING *tmp = fb_MonthName( month, (count==3) );
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += FB_STRSIZE( tmp );
                            } else {
                                pszAddFree = strdup( tmp->data );
                                LenAdd = 0;
                                do_add = TRUE;
                            }
                            fb_hStrDelTemp( tmp );
                        } else if( chCurrent=='y' && count<3 ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += 2;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%02d",
                                                  fb_Year( value ) % 100);
                                do_add = TRUE;
                            }
                        } else if( chCurrent=='y' && count==4 ) {
                            i += count-1;
                            if( !do_output ) {
                                pInfo->length_min += 4;
                            } else {
                                LenAdd = sprintf( ((pszAdd = FixPart), FixPart),
                                                  "%04d",
                                                  fb_Year( value ));
                                do_add = TRUE;
                            }
                        } else {
                            if( !do_output ) {
                                ++pInfo->length_min;
                            } else {
                                do_add = TRUE;
                            }
                        }
                    } else {
                        if( !do_output ) {
                            ++pInfo->length_min;
                        } else {
                            do_add = TRUE;
                        }
                    }
                    break;
                case '/':
                    /* date divider */
                    if( !do_output ) {
                        ++pInfo->length_min;
                    } else {
                        if( pInfo->mask_type==eMT_DateTime ) {
                            pszAdd = &chDateSep;
                        }
                        do_add = TRUE;
                    }
                    break;
                case ':':
                    /* time divider */
                    if( !do_output ) {
                        ++pInfo->length_min;
                    } else {
                        if( pInfo->mask_type==eMT_DateTime ) {
                            pszAdd = &chTimeSep;
                        }
                        do_add = TRUE;
                    }
                    break;
                case 'a':
                case 'A':
                    /* AM/PM or A/P (in any combination of cases) */
                    if( pInfo->mask_type==eMT_DateTime ) {
                        if( (strncasecmp( mask+i, "AM/PM", 5 )==0)
                            || (strncasecmp( mask+i, "A/P", 3 )==0) )
                        {
                            if( !do_output ) {
                                if( pInfo->mask_type==eMT_Unknown ) {
                                    pInfo->mask_type = eMT_DateTime;
                                } else if( pInfo->mask_type!=eMT_DateTime ) {
                                    fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
                                    return FALSE;
                                }
                                pInfo->has_ampm = TRUE;
                            } else {
                                int ampm_small = mask[i+1]=='/';
                                LenAdd = ( ampm_small ? 1 : 2 );
                                if( fb_Hour( value ) >= 12 ) {
                                    pszAdd = mask + i + LenAdd + 1;
                                } else {
                                    pszAdd = mask + i;
                                }
                                do_add = TRUE;
                            }
                            i += ((mask[i+1]=='/') ? 2 : 4);
                        } else {
                            if( !do_output ) {
                                ++pInfo->length_min;
                            } else {
                                do_add = TRUE;
                            }
                        }
                    } else {
                        if( !do_output ) {
                            ++pInfo->length_min;
                        } else {
                            do_add = TRUE;
                        }
                    }
                    break;
                case '"':
                    do_string = TRUE;
                    break;
                default:
                    if( !do_output ) {
                        ++pInfo->length_min;
                    } else {
                        do_add = TRUE;
                    }
                    break;
                }
            }
        }
        if( last_was_comma && (chCurrent!=',' || i==(mask_length-1)) ) {
            if( !do_output && !was_k_div ) {
                pInfo->has_thousand_sep = TRUE;
            }
            last_was_comma = FALSE;
            was_k_div = FALSE;
        }
        if( do_add ) {
            do_add = FALSE;
            DBG_ASSERT(do_output);
            DBG_ASSERT(pszOut!=NULL);
            if( pszAddFree!=NULL )
                pszAdd = pszAddFree;
            if( LenAdd==0 )
                LenAdd = strlen( pszAdd );
            DBG_ASSERT(LenOut>=LenAdd);
            FB_MEMCPY( pszOut, pszAdd, LenAdd );
            pszOut += LenAdd;
            LenOut -= LenAdd;
            if( pszAddFree!=NULL ) {
                free( pszAddFree );
            }
        }
    }

    if( !do_output ) {
        if( !pInfo->has_decimal_point ) {
            if( pInfo->num_digits_omit!=0 ) {
                pInfo->num_digits_omit += 3;
            }
        }
        if( pInfo->has_thousand_sep ) {
            pInfo->length_min += (pInfo->num_digits_fix - 1) / 3;
        }
        if( LenFix > pInfo->num_digits_fix )
            pInfo->length_min += LenFix - pInfo->num_digits_fix;
        if( pInfo->exp_digits < 5 )
            pInfo->length_opt += 5 - pInfo->exp_digits;
        if( !pInfo->has_sign )
            pInfo->length_min += 1;
    } else {
        DBG_ASSERT( LenOut>=0 );
        *pszOut = 0;
        fb_hStrSetLength( dst, pszOut - dst->data );
    }

    return TRUE;
}

FBCALL FBSTRING *fb_hStrFormat
	(
		double value,
        const char *mask,
        size_t mask_length
	)
{
    FBSTRING *dst = &__fb_ctx.null_desc;
    const char *pszIntlResult;
    char chDecimalPoint, chThousandsSep, chDateSep, chTimeSep;

    fb_ErrorSetNum( FB_RTERROR_OK );

    FB_LOCK();
    pszIntlResult = fb_IntlGet( eFIL_NumDecimalPoint, FALSE );
    chDecimalPoint = (( pszIntlResult==NULL ) ? '.' : *pszIntlResult );
    pszIntlResult = fb_IntlGet( eFIL_NumThousandsSeparator, FALSE );
    chThousandsSep = (( pszIntlResult==NULL ) ? ',' : *pszIntlResult );
    pszIntlResult = fb_IntlGet( eFIL_DateDivider, FALSE );
    chDateSep = (( pszIntlResult==NULL ) ? '/' : *pszIntlResult );
    pszIntlResult = fb_IntlGet( eFIL_TimeDivider, FALSE );
    chTimeSep = (( pszIntlResult==NULL ) ? ':' : *pszIntlResult );
    FB_UNLOCK();
    
    if( chDecimalPoint==0 )
        chDecimalPoint = '.';
    if( chThousandsSep==0 )
        chThousandsSep = ',';

    FB_STRLOCK();

    if( mask == NULL || mask_length==0 ) 
    {
        dst = fb_hBuildDouble( value, chDecimalPoint, 0 );
    } 
    else 
    {
        FormatMaskInfo info;

        /* Extract all information from the mask string */
        if( fb_hProcessMask( NULL,
                              mask, mask_length,
                              value, &info,
                              chThousandsSep, chDecimalPoint,
                              chDateSep, chTimeSep ) ) 
        {
            dst = fb_hStrAllocTemp_NoLock( NULL, info.length_min + info.length_opt );
            if( dst == NULL ) 
            {
                fb_ErrorSetNum( FB_RTERROR_OUTOFMEM );
                dst = &__fb_ctx.null_desc;
            }
		    else
            {
                /* Build the new string according to the mask */
                fb_hProcessMask( dst,
                                 mask, mask_length,
                                 value, &info,
                                 chThousandsSep, chDecimalPoint,
                                 chDateSep, chTimeSep );
            }
        }
    }

    FB_STRUNLOCK();

    return dst;
}

FBCALL FBSTRING *fb_StrFormat
	(
		double value,
		FBSTRING *mask
	)
{
    FBSTRING *dst;

    dst = fb_hStrFormat( value, mask->data, FB_STRSIZE(mask) );

	/* del if temp */
	fb_hStrDelTemp( mask );

    return dst;
}
