getdate.y

mgcp协议源代码。支持多种编码：g711

    { "cct",	tZONE,     -HOUR(8) },	/* China Coast, USSR Zone 7 */
    { "jst",	tZONE,     -HOUR(9) },	/* Japan Standard, USSR Zone 8 */
#if 0
    { "cast",	tZONE,     -HOUR(9.5) },/* Central Australian Standard */
    { "cadt",	tDAYZONE,  -HOUR(9.5) },/* Central Australian Daylight */
#endif
    { "east",	tZONE,     -HOUR(10) },	/* Eastern Australian Standard */
    { "eadt",	tDAYZONE,  -HOUR(10) },	/* Eastern Australian Daylight */
    { "gst",	tZONE,     -HOUR(10) },	/* Guam Standard, USSR Zone 9 */
    { "nzt",	tZONE,     -HOUR(12) },	/* New Zealand */
    { "nzst",	tZONE,     -HOUR(12) },	/* New Zealand Standard */
    { "nzdt",	tDAYZONE,  -HOUR(12) },	/* New Zealand Daylight */
    { "idle",	tZONE,     -HOUR(12) },	/* International Date Line East */
    {  NULL  }
};

/* Military timezone table. */
static TABLE const MilitaryTable[] = {
    { "a",	tZONE,	HOUR(  1) },
    { "b",	tZONE,	HOUR(  2) },
    { "c",	tZONE,	HOUR(  3) },
    { "d",	tZONE,	HOUR(  4) },
    { "e",	tZONE,	HOUR(  5) },
    { "f",	tZONE,	HOUR(  6) },
    { "g",	tZONE,	HOUR(  7) },
    { "h",	tZONE,	HOUR(  8) },
    { "i",	tZONE,	HOUR(  9) },
    { "k",	tZONE,	HOUR( 10) },
    { "l",	tZONE,	HOUR( 11) },
    { "m",	tZONE,	HOUR( 12) },
    { "n",	tZONE,	HOUR(- 1) },
    { "o",	tZONE,	HOUR(- 2) },
    { "p",	tZONE,	HOUR(- 3) },
    { "q",	tZONE,	HOUR(- 4) },
    { "r",	tZONE,	HOUR(- 5) },
    { "s",	tZONE,	HOUR(- 6) },
    { "t",	tZONE,	HOUR(- 7) },
    { "u",	tZONE,	HOUR(- 8) },
    { "v",	tZONE,	HOUR(- 9) },
    { "w",	tZONE,	HOUR(-10) },
    { "x",	tZONE,	HOUR(-11) },
    { "y",	tZONE,	HOUR(-12) },
    { "z",	tZONE,	HOUR(  0) },
    { NULL }
};

static int LookupWord(char * buff, YYSTYPE * yylval)
{
    register char	*p;
    register char	*q;
    register const TABLE	*tp;
    int			i;
    int			abbrev;

    /* Make it lowercase. */
    for (p = buff; *p != '\0'; p++)
        *p = (char)tolower(*p);

    if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
	yylval->Meridian = MERam;
	return tMERIDIAN;
    }
    if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
	yylval->Meridian = MERpm;
	return tMERIDIAN;
    }

    /* See if we have an abbreviation for a month. */
    if (strlen(buff) == 3)
	abbrev = 1;
    else if (strlen(buff) == 4 && buff[3] == '.') {
	abbrev = 1;
	buff[3] = '\0';
    }
    else
	abbrev = 0;

    for (tp = MonthDayTable; tp->name; tp++) {
	if (abbrev) {
	    if (strncmp(buff, tp->name, 3) == 0) {
		yylval->Number = tp->value;
		return tp->type;
	    }
	}
	else if (strcmp(buff, tp->name) == 0) {
	    yylval->Number = tp->value;
	    return tp->type;
	}
    }

    for (tp = TimezoneTable; tp->name; tp++)
	if (strcmp(buff, tp->name) == 0) {
	    yylval->Number = tp->value;
	    return tp->type;
	}

    if (strcmp(buff, "dst") == 0) 
	return tDST;

    for (tp = UnitsTable; tp->name; tp++)
	if (strcmp(buff, tp->name) == 0) {
	    yylval->Number = tp->value;
	    return tp->type;
	}

    /* Strip off any plural and try the units table again. */
    i = strlen(buff) - 1;
    if (buff[i] == 's') {
	buff[i] = '\0';
	for (tp = UnitsTable; tp->name; tp++)
	    if (strcmp(buff, tp->name) == 0) {
		yylval->Number = tp->value;
		return tp->type;
	    }
	buff[i] = 's';		/* Put back for "this" in OtherTable. */
    }

    for (tp = OtherTable; tp->name; tp++)
	if (strcmp(buff, tp->name) == 0) {
	    yylval->Number = tp->value;
	    return tp->type;
	}

    /* Military timezones. */
    if (buff[1] == '\0' && isalpha(*buff)) {
	for (tp = MilitaryTable; tp->name; tp++)
	    if (strcmp(buff, tp->name) == 0) {
		yylval->Number = tp->value;
		return tp->type;
	    }
    }

    /* Drop out any periods and try the timezone table again. */
    for (i = 0, p = q = buff; *q; q++)
	if (*q != '.')
	    *p++ = *q;
	else
	    i++;
    *p = '\0';
    if (i)
	for (tp = TimezoneTable; tp->name; tp++)
	    if (strcmp(buff, tp->name) == 0) {
		yylval->Number = tp->value;
		return tp->type;
	    }

    for (i = 1; i <= 12; i++)
	for (abbrev = 0; abbrev < 2; abbrev++)
	    if (PTimeIsMonthName(buff, i, abbrev)) {
		yylval->Number = i;
		return tMONTH;
	    }

    for (i = 1; i <= 7; i++)
	for (abbrev = 0; abbrev < 2; abbrev++)
	    if (PTimeIsDayName(buff, i, abbrev)) {
		yylval->Number = i;
		return tDAY;
	    }

    return tID;
}


#ifdef _MSC_VER
#pragma warning(disable:4211)
#endif

#ifndef __GNUC__
static
#endif
int yylex(YYSTYPE * yylval, void * yyInput)
{
    register char	*p;
    char		buff[20];
    int			Count;
    int			sign;
    register int	c = PTimeGetChar(yyInput);

    while (c != EOF && c != '\0' && c != '\n') {
	while (isspace(c))
	    c = PTimeGetChar(yyInput);

	if (isdigit(c) || c == '-' || c == '+') {
	    if (c == '-' || c == '+') {
		sign = c == '-' ? -1 : 1;
		if (!isdigit(c = PTimeGetChar(yyInput)))
		    /* skip the '-' sign */
		    continue;
	    }
	    else
		sign = 0;
	    yylval->Number = 0;
	    while (isdigit(c)) {
		yylval->Number = 10 * yylval->Number + c - '0';
		c = PTimeGetChar(yyInput);
	    }
	    PTimeUngetChar(yyInput, c);
	    if (sign < 0)
		yylval->Number = -yylval->Number;
	    return sign ? tSNUMBER : tUNUMBER;
	}

	if (isalpha(c)) {
	    for (p = buff; isalpha(c) || c == '.'; c = PTimeGetChar(yyInput)) {
		if (p < &buff[sizeof(buff)-1])
		    *p++ = (char)c;
	    }
	    *p = '\0';
	    PTimeUngetChar(yyInput, c);
	    return LookupWord(buff, yylval);
	}

	if (c != '(')
	    return c;

	Count = 0;
	do {
	    c = PTimeGetChar(yyInput);
	    if (c == '\0' || c == EOF)
		return c;
	    if (c == '(')
		Count++;
	    else if (c == ')')
		Count--;
	} while (Count > 0);
    }

    return EOF;
}

#ifdef _MSC_VER
#pragma warning(default:4211)
#endif


static time_t ToSeconds(time_t Hours, time_t Minutes, time_t Seconds,
			MERIDIAN Meridian)
{
    if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
	return -1;
    switch (Meridian) {
    case MER24:
	if (Hours < 0 || Hours > 23)
	    return -1;
	return (Hours * 60L + Minutes) * 60L + Seconds;
    case MERam:
	if (Hours < 1 || Hours > 12)
	    return -1;
	if (Hours == 12)
	    Hours = 0;
	return (Hours * 60L + Minutes) * 60L + Seconds;
    case MERpm:
	if (Hours < 1 || Hours > 12)
	    return -1;
	if (Hours == 12)
	    Hours = 0;
	return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
    }

    return -1;
}


static time_t Convert(time_t Month, time_t Day, time_t Year,
		      time_t Hours, time_t Minutes, time_t Seconds,
		      MERIDIAN Meridian, DSTMODE DSTmode, time_t yyTimezone)
{
    static int DaysInMonth[12] = {
	31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    };
    time_t	tod;
    time_t	Julian;
    int		i;

    if (Year < 0)
	Year = -Year;
    if (Year < 70)
	Year += 2000;
    else if (Year < 100)
	Year += 1900;
    DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
		    ? 29 : 28;
    /* Checking for 2038 bogusly assumes that time_t is 32 bits.  But
       I'm too lazy to try to check for time_t overflow in another way.  */
    if (Year < EPOCH || Year > 2038
     || Month < 1 || Month > 12
     /* Lint fluff:  "conversion from long may lose accuracy" */
     || Day < 1 || Day > DaysInMonth[(int)--Month])
	return -1;

    for (Julian = Day - 1, i = 0; i < Month; i++)
	Julian += DaysInMonth[i];
    for (i = EPOCH; i < Year; i++)
	Julian += 365 + (i % 4 == 0);
    Julian *= SECSPERDAY;
    Julian += yyTimezone * 60L;
    if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
	return -1;
    Julian += tod;
    if (DSTmode == DSTon
     || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst))
	Julian -= 60 * 60;
    return Julian;
}


static time_t DSTcorrect(time_t Start, time_t Future)
{
    time_t	StartDay;
    time_t	FutureDay;

    StartDay = (localtime(&Start)->tm_hour + 1) % 24;
    FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
    return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
}


static time_t RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
{
    struct tm	*tm;
    time_t	now;

    now = Start;
    tm = localtime(&now);
    now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
    now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
    return DSTcorrect(Start, now);
}


static time_t RelativeMonth(time_t Start, time_t RelMonth, time_t yyTimezone)
{
    struct tm	*tm;
    time_t	Month;
    time_t	Year;

    if (RelMonth == 0)
	return 0;
    tm = localtime(&Start);
    Month = 12 * tm->tm_year + tm->tm_mon + RelMonth;
    Year = Month / 12;
    Month = Month % 12 + 1;
    return DSTcorrect(Start,
	    Convert(Month, (time_t)tm->tm_mday, Year,
		(time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
		MER24, DSTmaybe, yyTimezone));
}


static void SetPossibleDate(struct Variables * var,
			      time_t possible_day,
			      time_t possible_month,
			      time_t possible_year)
{
    int date_order;

    if (possible_day > 31) /* test for ymd */
	date_order = 2;
    else if (possible_day > 12) /* test for dmy */
	date_order = 1;
    else if (possible_month > 12) /* test for mdy */
	date_order = 0;
    else {
	static int default_date_order = -1;
	if (default_date_order < 0)
	    default_date_order = PTimeGetDateOrder();
	date_order = default_date_order;
    }

    switch (date_order) {
      case 0 :
	var->yyDay   = possible_month;
	var->yyMonth = possible_day;
	var->yyYear  = possible_year;
	break;
      case 1 :
	var->yyDay   = possible_day;
	var->yyMonth = possible_month;
	var->yyYear  = possible_year;
	break;
      default :
	var->yyDay   = possible_year;
	var->yyMonth = possible_month;
	var->yyYear  = possible_day;
    }
}


time_t STDAPICALLTYPE PTimeParse(void * inputStream, struct tm * now, int timezone)
{
    time_t		Start;
    struct Variables	var;


    var.yyInput = inputStream;
    var.yyYear = now->tm_year + 1900;
    var.yyMonth = now->tm_mon + 1;
    var.yyDay = now->tm_mday;
    var.yyTimezone = -timezone;
    var.yyDSTmode = DSTmaybe;
    var.yyHour = 0;
    var.yyMinutes = 0;
    var.yySeconds = 0;
    var.yyMeridian = MER24;
    var.yyRelSeconds = 0;
    var.yyRelMonth = 0;
    var.yyHaveDate = 0;
    var.yyHaveDay = 0;
    var.yyHaveRel = 0;
    var.yyHaveTime = 0;
    var.yyHaveZone = 0;

    yyparse(&var);

    if (var.yyHaveTime > 1 || var.yyHaveZone > 1 ||
	var.yyHaveDate > 1 || var.yyHaveDay > 1)
	return -1;

    if (var.yyHaveTime == 0 && var.yyHaveZone == 0 &&
	var.yyHaveDate == 0 && var.yyHaveDay == 0 && var.yyHaveRel == 0)
	return -1;

    if (var.yyHaveDate || var.yyHaveTime || var.yyHaveDay) {
	Start = Convert(var.yyMonth, var.yyDay, var.yyYear,
			var.yyHour, var.yyMinutes, var.yySeconds,
			var.yyMeridian, var.yyDSTmode, var.yyTimezone);
	if (Start < 0)
	    return -1;
    }
    else {
	time(&Start);
	if (!var.yyHaveRel)
	    Start -= ((now->tm_hour * 60L + now->tm_min) * 60L) + now->tm_sec;
    }

    Start += var.yyRelSeconds;
    Start += RelativeMonth(Start, var.yyRelMonth, var.yyTimezone);

    if (var.yyHaveDay && !var.yyHaveDate)
	Start += RelativeDate(Start, var.yyDayOrdinal, var.yyDayNumber);

    /* Have to do *something* with a legitimate -1 so it's distinguishable
     * from the error return value.  (Alternately could set errno on error.) */
    return Start == -1 ? 0 : Start;
}


#ifdef _MSC_VER
#pragma warning(disable:4100 4211)
#endif

#ifdef __GNUC__
int yyerror(const char * s)
{
  return 0;
}
#else
static void yyerror(const char * s)
{
}
#endif

#ifdef _MSC_VER
#pragma warning(default:4100 4211)
#endif


/* End of file ***************************************************************/