strftime.c

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*
*       *** For internal use with strftime() only ***
*
*Entry:
*       int num = pointer to integer value
*       int digits = # of ascii digits to put into string
*       char **out = address of pointer to output string
*       size_t *count = address of char count (space in output area)
*
*Exit:
*       none
*Exceptions:
*
*******************************************************************************/

static void __cdecl _store_num (
        int num,
        int digits,
        char **out,
        size_t *count
        )
{
int temp=0;

        if (__no_lead_zeros) {
                _store_number (num, out, count);
                return;
        }

        if ((size_t)digits < *count)  {
                for (digits--; (digits+1); digits--) {
                        (*out)[digits] = (char)('0' + num % 10);
                        num /= 10;
                        temp++;
                }
                *out += temp;
                *count -= temp;
        }
else
        *count = 0;
}

/***
*_store_number() - Convert positive integer to string
*
*Purpose:
*       Convert positive integer to a string and store it in the output
*       buffer with no null terminator.  Update both the count and
*       buffer pointers.
*
*       Differs from _store_num in that the precision is not specified,
*       and no leading zeros are added.
*
*       *** For internal use with strftime() only ***
*
*       Created from xtoi.c
*
*Entry:
*       int num = pointer to integer value
*       char **out = address of pointer to output string
*       size_t *count = address of char count (space in output area)
*
*Exit:
*       none
*
*Exceptions:
*       The buffer is filled until it is out of space.  There is no
*       way to tell beforehand (as in _store_num) if the buffer will
*       run out of space.
*
*******************************************************************************/

static void __cdecl _store_number (
        int num,
        char **out,
        size_t *count
        )
{
        char *p;                /* pointer to traverse string */
        char *firstdig;         /* pointer to first digit */
        char temp;              /* temp char */

        p = *out;

        /* put the digits in the buffer in reverse order */
        if (*count > 1)
        {
                do {
                        *p++ = (char) (num % 10 + '0');
                        (*count)--;
                } while ((num/=10) > 0 && *count > 1);
        }

        firstdig = *out;                /* firstdig points to first digit */
        *out = p;                       /* return pointer to next space */
        p--;                            /* p points to last digit */

        /* reverse the buffer */
        do {
                temp = *p;
                *p-- = *firstdig;
                *firstdig++ = temp;     /* swap *p and *firstdig */
        } while (firstdig < p);         /* repeat until halfway */
}


/***
*_store_winword() - Store date/time in WinWord format
*
*Purpose:
*       Format the date/time in the supplied WinWord format
*       and store it in the supplied buffer.
*
*       *** For internal use with strftime() only ***
*
*       The WinWord format is converted token by token to
*       strftime conversion specifiers.  _expandtime is then called to
*       do the work.  The WinWord format is expected to be a
*       character string (not wide-chars).
*
*Entry:
*       const char **format = address of pointer to WinWord format
*       const struct tm *tmptr = pointer to time/date structure
*       char **out = address of pointer to output string
*       size_t *count = address of char count (space in output area)
*       struct __lc_time_data *lc_time = pointer to locale-specific info
*
*Exit:
*       none
*
*Exceptions:
*
*******************************************************************************/

static void __cdecl _store_winword (
        const char *format,
        const struct tm *tmptr,
        char **out,
        size_t *count,
        struct __lc_time_data *lc_time
        )
{
        char specifier;
        const char *p;
        int repeat;
        char *ampmstr;

        while (*format && *count != 0)
        {
                specifier = 0;          /* indicate no match */
                __no_lead_zeros = 0;    /* default is print leading zeros */

                /* count the number of repetitions of this character */
                for (repeat=0, p=format; *p++ == *format; repeat++);
                /* leave p pointing to the beginning of the next token */
                p--;

                /* switch on ascii format character and determine specifier */
                switch (*format)
                {
                        case 'M':
                                switch (repeat)
                                {
                                        case 1: __no_lead_zeros = 1; /* fall thru */
                                        case 2: specifier = 'm'; break;
                                        case 3: specifier = 'b'; break;
                                        case 4: specifier = 'B'; break;
                                } break;
                        case 'd':
                                switch (repeat)
                                {
                                        case 1: __no_lead_zeros = 1; /* fall thru */
                                        case 2: specifier = 'd'; break;
                                        case 3: specifier = 'a'; break;
                                        case 4: specifier = 'A'; break;
                                } break;
                        case 'y':
                                switch (repeat)
                                {
                                        case 2: specifier = 'y'; break;
                                        case 4: specifier = 'Y'; break;
                                } break;
                        case 'h':
                                switch (repeat)
                                {
                                        case 1: __no_lead_zeros = 1; /* fall thru */
                                        case 2: specifier = 'I'; break;
                                } break;
                        case 'H':
                                switch (repeat)
                                {
                                        case 1: __no_lead_zeros = 1; /* fall thru */
                                        case 2: specifier = 'H'; break;
                                } break;
                        case 'm':
                                switch (repeat)
                                {
                                        case 1: __no_lead_zeros = 1; /* fall thru */
                                        case 2: specifier = 'M'; break;
                                } break;
                        case 's': /* for compatibility; not strictly WinWord */
                                switch (repeat)
                                {
                                        case 1: __no_lead_zeros = 1; /* fall thru */
                                        case 2: specifier = 'S'; break;
                                } break;
                        case 'A':
                        case 'a':
                                if (!_stricmp(format, "am/pm"))
                                        p = format + 5;
                                else if (!_stricmp(format, "a/p"))
                                        p = format + 3;
                                specifier = 'p';
                                break;
                        case 't': /* t or tt time marker suffix */
                                if ( tmptr->tm_hour <= 11 )
                                        ampmstr = lc_time->ampm[0];
                                else
                                        ampmstr = lc_time->ampm[1];

                                if (  (repeat == 1) && (*count > 0) )
                                {
                                        if ( isleadbyte((int)*ampmstr) && (*count > 1) )
                                        {
                                                *(*out)++ = *ampmstr++;
                                                (*count)--;
                                        }
                                        *(*out)++ = *ampmstr++;
                                        (*count)--;
                                }
                                else
                                {
                                        /* assume repeat == 2           */
                                        /* i.e. copy whole am/pm string */
                                        while( (*ampmstr != 0) && ( *count > 0 ) )
                                        {
                                                if ( isleadbyte((int)*ampmstr) && (*count > 1) )
                                                {
                                                        *(*out)++ = *ampmstr++;
                                                        (*count)--;
                                                }
                                                *(*out)++ = *ampmstr++;
                                                (*count)--;
                                        }
                                }
                                format = p;
                                continue;

                        case '\'': /* literal string */
                                if (repeat & 1) /* odd number */
                                {
                                        format += repeat;
                                        while (*format && *count != 0)
                                        {
                                                if (*format == '\'')
                                                {
                                                        format++;
                                                        break;
                                                }
                                                if ( isleadbyte((int)*format) &&
                                                     (*count > 1) )
                                                {
                                                        *(*out)++ = *format++;
                                                        (*count)--;
                                                }
                                                *(*out)++ = *format++;
                                                (*count)--;
                                        }
                                }
                                else { /* even number */
                                        format += repeat;
                                }
                                continue;

                        default: /* non-control char, print it */
                                break;
                } /* switch */

                /* expand specifier, or copy literal if specifier not found */
                if (specifier)
                {
                        _expandtime(specifier, tmptr, out, count, lc_time);
                        format = p; /* bump format up to the next token */
                } else {
                        if (isleadbyte((int)*format))
                        {
                                *(*out)++ = *format++;
                                (*count)--;
                        }
                        *(*out)++ = *format++;
                        (*count)--;
                }
        } /* while */
}