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//========================================================================

//

//      timeutil.cxx

//

//      ISO C date and time implementation support functions

//

//========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

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//

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// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

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//####ECOSGPLCOPYRIGHTEND####

//========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-28

// Purpose:       Provide support functions used by the ISO C date and time

//                implementation

// Description:   This file provides the functions:

//                  cyg_libc_time_normalize_structtm()

//                  cyg_libc_time_getzoneoffsets()

//                  cyg_libc_time_setzoneoffsets()

//                  cyg_libc_time_setdst()

//                  cyg_libc_time_itoa()

//                and the globals:

//                  cyg_libc_time_day_name

//                  cyg_libc_time_day_name_len

//                  cyg_libc_time_month_name

//                  cyg_libc_time_month_name_len

//                  cyg_libc_time_month_lengths

//                  cyg_libc_time_current_dst_stat

//                  cyg_libc_time_current_std_offset

//                  cyg_libc_time_current_dst_offset

// Usage:         

//

//####DESCRIPTIONEND####

//

//========================================================================

// CONFIGURATION

#include <pkgconf/libc_time.h>          // C library configuration

// INCLUDES

// define these functions as outline, not inline, functions in this file

#define CYGPRI_LIBC_TIME_GETZONEOFFSETS_INLINE extern "C"

#define CYGPRI_LIBC_TIME_SETZONEOFFSETS_INLINE extern "C"

#define CYGPRI_LIBC_TIME_SETDST_INLINE extern "C"

#include <cyg/infra/cyg_type.h>    // Common type definitions and support

#include <cyg/libc/time/timeutil.h>// Header for this file

#include <time.h>                  // Main date and time definitions

#include <stdlib.h>                // for div() and abs()

// GLOBALS

// FIXME: PR19440 - const char & -fwritable-strings don't mix

const char cyg_libc_time_day_name[7][10] = {

    "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",

    "Saturday"

};

const cyg_uint8 cyg_libc_time_day_name_len[7] = { 6, 6, 7, 9, 8, 6, 8 };

// FIXME: PR19440 - const char & -fwritable-strings don't mix

const char cyg_libc_time_month_name[12][10] = {

    "January", "February", "March", "April", "May", "June",

    "July", "August", "September", "October", "November", "December"

};

const cyg_uint8 cyg_libc_time_month_name_len[12] = { 7, 8, 5, 5, 3, 4,

                                                     4, 6, 9, 7, 8, 8 };

const cyg_uint8 cyg_libc_time_month_lengths[2][12] = {

    {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},

    {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}

};

Cyg_libc_time_dst cyg_libc_time_current_dst_stat =

     (Cyg_libc_time_dst)CYGNUM_LIBC_TIME_DST_DEFAULT_STATE;

time_t cyg_libc_time_current_std_offset =

     (time_t)CYGNUM_LIBC_TIME_STD_DEFAULT_OFFSET;

time_t cyg_libc_time_current_dst_offset =

     (time_t)CYGNUM_LIBC_TIME_DST_DEFAULT_OFFSET;

// FUNCTIONS

////////////////////////////////////////

// cyg_libc_time_normalize_structtm() //

////////////////////////////////////////

//

// cyg_libc_time_normalize_structtm() will adjust the fields of a struct tm

// so that they are within the normal ranges expected.

// tm_wday, tm_yday and tm_isdst are ignored

externC void

cyg_libc_time_normalize_structtm( struct tm *timeptr )

{

    div_t t;

    CYG_REPORT_FUNCNAME("cyg_libc_time_normalize_structtm");

    CYG_REPORT_FUNCARG1("timeptr is at address %08x", timeptr);

    // normalize seconds to 0..59

    if ((timeptr->tm_sec < 0) || (timeptr->tm_sec > 59)) {

        t = div(timeptr->tm_sec, 60);

        while (t.rem < 0) {

            t.rem += 60;

            --t.quot;

        }

        timeptr->tm_min += t.quot;

        timeptr->tm_sec = t.rem;

    } // if

    // normalize minutes to 0..59

    if ((timeptr->tm_min < 0) || (timeptr->tm_min > 59)) {

        t = div(timeptr->tm_min, 60);

        while (t.rem < 0) {

            t.rem += 60;

            --t.quot;

        }

        timeptr->tm_hour += t.quot;

        timeptr->tm_min = t.rem;

    } // if

    // normalize hours to 0..23

    if ((timeptr->tm_hour < 0) || (timeptr->tm_hour > 23)) {

        t = div(timeptr->tm_hour, 24);

        while (t.rem < 0) {

            t.rem += 24;

            --t.quot;

        }

        timeptr->tm_mday += t.quot;

        timeptr->tm_hour = t.rem;

    } // if

    // we wait before normalizing tm_mday as per ISO C 7.12.2.3 (although

    // actually it only makes sense if you think about it

    // normalize months to 0..11

    if ((timeptr->tm_mon < 0) || (timeptr->tm_mon > 11)) {

        t = div(timeptr->tm_mon, 12);

        while (t.rem < 0) {

            t.rem += 12;

            --t.quot;

        }

        timeptr->tm_year += t.quot;

        timeptr->tm_mon = t.rem;

    } // if

    // now tm_mday which needs to go to 1..31

    cyg_bool leap = cyg_libc_time_year_is_leap(timeptr->tm_year);

    while (timeptr->tm_mday < 1) {

        // move back a month

        if (--timeptr->tm_mon < 0) {

            --timeptr->tm_year;

            timeptr->tm_mon = 11;

            leap = cyg_libc_time_year_is_leap(timeptr->tm_year);

        } // if

        // we move backward the number of days in the _new_ current month

        timeptr->tm_mday += cyg_libc_time_month_lengths[leap][timeptr->tm_mon];

    } // while

    while (timeptr->tm_mday >

           cyg_libc_time_month_lengths[leap][timeptr->tm_mon]) {

        // move forward a month

        // we move forward the number of days in the _old_ current month

        timeptr->tm_mday -= cyg_libc_time_month_lengths[leap][timeptr->tm_mon];

        if (++timeptr->tm_mon > 11) {

            ++timeptr->tm_year;

            timeptr->tm_mon = 0;

            leap = cyg_libc_time_year_is_leap(timeptr->tm_year);

        } // if

    } // while

    CYG_REPORT_RETURN();

} // cyg_libc_time_normalize_structtm()

//////////////////////////

// cyg_libc_time_itoa() //

//////////////////////////

//

// This converts num to a string and puts it into s padding with

// "0"'s if padzero is set, or spaces otherwise if necessary.

// The number of chars written to s is returned

//

// This implementation is probably suboptimal in terms of performance

// but there wouldn't be much in it with only 11 chars max to convert :-/.

// Actually FIXME: what if someone passes a width >11

externC cyg_uint8

cyg_libc_time_itoa( cyg_uint8 *s, cyg_int32 num, cyg_uint8 width,

                    cyg_bool padzero )

{

    CYG_REPORT_FUNCNAMETYPE("cyg_libc_time_itoa", "returning %d");

    CYG_REPORT_FUNCARG4( "s=%08x, num=%d, width=%d, padzero=%d",

                         s, num, width, padzero );

    CYG_CHECK_DATA_PTR(s, "input string not a valid pointer");

    // special case for zero otherwise we'd have to treat it specially later

    // on anyway

    if (num==0) {

        cyg_ucount8 i;

        for (i=0; i<width; ++i)

            s[i] = padzero ? '0' : ' ';

        CYG_REPORT_RETVAL(i);

        return i;

    }

    // return value

    cyg_uint8 ret=0;

    // Pre-fiddle for negative numbers

    if ((num < 0) && (width > 0)) {

        *s++ = '-';

        --width;

        num = abs(num);

        ++ret;

    }

    cyg_ucount32 i;

    cyg_bool reachednum = false;

    cyg_uint8 c, j;

    // i starts off with factor of 10 digits - which is the string length

    // of a positive 32-bit number

    for (i=1000000000, j=10; i>0; i/=10, --j) {

        c = (num / i);

        if (!reachednum && c==0) {

            if (j <= width) {

                *s++ = padzero ?  '0' : ' ';

                ++ret;

            }

        } // if

        else {

            *s++ = c + '0';

            ++ret;

            reachednum = true;

        }

        num %= i;

    } // for

    CYG_POSTCONDITION(ret >= width, "Didn't output enough chars!");

    CYG_REPORT_RETVAL(ret);

    return ret;

} // cyg_libc_time_itoa()

// EOF timeutil.cxx