strftime.c

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/***
*strftime.c - String Format Time
*
*       Copyright (c) 1988-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*
*******************************************************************************/

#ifdef _MAC
#define _WLM_NOFORCE_LIBS
#include <windows.h>
#ifdef _WIN32
#undef  _WIN32  /* windows.h should NOT set _WIN32 */
#endif  /* _WIN32 */
/* The following two TYPEDEFs are NOT defined in <windows.h> for the Mac */
typedef DWORD LCTYPE;           /* from windows.h */
typedef int mbstate_t;          /* from wchar.h */
#endif  /* _MAC */

#include <cruntime.h>
#include <internal.h>
#include <mtdll.h>
#include <time.h>
#include <locale.h>
#include <setlocal.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <xlocinfo.h>

/* Prototypes for local routines */
static void __cdecl _expandtime (char specifier, const struct tm *tmptr,
        char **out, size_t *count, struct __lc_time_data *lc_time);
static void __cdecl _store_str (char *in, char **out, size_t *count);
static void __cdecl _store_num (int num, int digits, char **out, size_t *count);
static void __cdecl _store_number (int num, char **out, size_t *count);
static void __cdecl _store_winword (const char *format, const struct tm *tmptr, char **out, size_t *count, struct __lc_time_data *lc_time);


/* LC_TIME data for local "C" */

__declspec(selectany) struct __lc_time_data __lc_time_c = {

        {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"},

        {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
                "Friday", "Saturday", },

        {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
                "Sep", "Oct", "Nov", "Dec"},

        {"January", "February", "March", "April", "May", "June",
                "July", "August", "September", "October",
                "November", "December"},

        {"AM", "PM"}

        , { "M/d/yy" }
        , { "dddd, MMMM dd, yyyy" }
        , { "H:mm:ss" }
        };

/* Pointer to the current LC_TIME data structure. */

struct __lc_time_data *__lc_time_curr = &__lc_time_c;

/* Flags */
unsigned __alternate_form;
unsigned __no_lead_zeros;

#define TIME_SEP        ':'

/*      get a copy of the current day names */
char * __cdecl _Getdays (
        void
        )
{
        const struct __lc_time_data *pt = __lc_time_curr;
        size_t n, len = 0;
        char *p;

        for (n = 0; n < 7; ++n)
                len += strlen(pt->wday_abbr[n]) + strlen(pt->wday[n]) + 2;
        p = (char *)malloc(len + 1);

        if (p != 0) {
                char *s = p;

                for (n = 0; n < 7; ++n) {
                        *s++ = TIME_SEP;
                        s += strlen(strcpy(s, pt->wday_abbr[n]));
                        *s++ = TIME_SEP;
                        s += strlen(strcpy(s, pt->wday[n]));
                }
                *s++ = '\0';
        }

        return (p);
}

/*      get a copy of the current month names */
char * __cdecl _Getmonths (
        void
        )
{
        const struct __lc_time_data *pt = __lc_time_curr;
        size_t n, len = 0;
        char *p;

        for (n = 0; n < 12; ++n)
                len += strlen(pt->month_abbr[n]) + strlen(pt->month[n]) + 2;
        p = (char *)malloc(len + 1);

        if (p != 0) {
                char *s = p;

                for (n = 0; n < 12; ++n) {
                        *s++ = TIME_SEP;
                        s += strlen(strcpy(s, pt->month_abbr[n]));
                        *s++ = TIME_SEP;
                        s += strlen(strcpy(s, pt->month[n]));
                }
                *s++ = '\0';
        }

        return (p);
}

/*      get a copy of the current time locale information */
void * __cdecl _Gettnames (
        void
        )
{
        const struct __lc_time_data *pt = __lc_time_curr;
        size_t n, len = 0;
        void *p;

        for (n = 0; n < 7; ++n)
                len += strlen(pt->wday_abbr[n]) + strlen(pt->wday[n]) + 2;
        for (n = 0; n < 12; ++n)
                len += strlen(pt->month_abbr[n]) + strlen(pt->month[n]) + 2;
        len += strlen(pt->ampm[0]) + strlen(pt->ampm[1]) + 2;
        len += strlen(pt->ww_sdatefmt) + 1;
        len += strlen(pt->ww_ldatefmt) + 1;
        len += strlen(pt->ww_timefmt) + 1;
        p = malloc(sizeof (*pt) + len);

        if (p != 0)
                {struct __lc_time_data *pn = (struct __lc_time_data *)p;
                char *s = (char *)p + sizeof (*pt);

                memcpy(p, __lc_time_curr, sizeof (*pt));
                for (n = 0; n < 7; ++n)
                        {pn->wday_abbr[n] = s;
                        s += strlen(strcpy(s, pt->wday_abbr[n])) + 1;
                        pn->wday[n] = s;
                        s += strlen(strcpy(s, pt->wday[n])) + 1; }
                for (n = 0; n < 12; ++n)
                        {pn->month_abbr[n] = s;
                        s += strlen(strcpy(s, pt->month_abbr[n])) + 1;
                        pn->month[n] = s;
                        s += strlen(strcpy(s, pt->month[n])) + 1; }
                pn->ampm[0] = s;
                s += strlen(strcpy(s, pt->ampm[0])) + 1;
                pn->ampm[1] = s;
                s += strlen(strcpy(s, pt->ampm[1])) + 1;
                pn->ww_sdatefmt = s;
                s += strlen(strcpy(s, pt->ww_sdatefmt)) + 1;
                pn->ww_ldatefmt = s;
                s += strlen(strcpy(s, pt->ww_ldatefmt)) + 1;
                pn->ww_timefmt = s; }

        return (p);
}


/***
*size_t strftime(string, maxsize, format, timeptr) - Format a time string
*
*Purpose:
*       Place characters into the user's output buffer expanding time
*       format directives as described in the user's control string.
*       Use the supplied 'tm' structure for time data when expanding
*       the format directives.
*       [ANSI]
*
*Entry:
*       char *string = pointer to output string
*       size_t maxsize = max length of string
*       const char *format = format control string
*       const struct tm *timeptr = pointer to tb data structure
*
*Exit:
*       !0 = If the total number of resulting characters including the
*       terminating null is not more than 'maxsize', then return the
*       number of chars placed in the 'string' array (not including the
*       null terminator).
*
*       0 = Otherwise, return 0 and the contents of the string are
*       indeterminate.
*
*Exceptions:
*
*******************************************************************************/

size_t __cdecl strftime (
        char *string,
        size_t maxsize,
        const char *format,
        const struct tm *timeptr
        )
{
        return (_Strftime(string, maxsize, format, timeptr, 0));
}

/***
*size_t _Strftime(string, maxsize, format,
*       timeptr, lc_time) - Format a time string for a given locale
*
*Purpose:
*       Place characters into the user's output buffer expanding time
*       format directives as described in the user's control string.
*       Use the supplied 'tm' structure for time data when expanding
*       the format directives. use the locale information at lc_time.
*       [ANSI]
*
*Entry:
*       char *string = pointer to output string
*       size_t maxsize = max length of string
*       const char *format = format control string
*       const struct tm *timeptr = pointer to tb data structure
*               struct __lc_time_data *lc_time = pointer to locale-specific info
*                       (passed as void * to avoid type mismatch with C++)
*
*Exit:
*       !0 = If the total number of resulting characters including the
*       terminating null is not more than 'maxsize', then return the
*       number of chars placed in the 'string' array (not including the
*       null terminator).
*
*       0 = Otherwise, return 0 and the contents of the string are
*       indeterminate.
*
*Exceptions:
*
*******************************************************************************/

size_t __cdecl _Strftime (
        char *string,
        size_t maxsize,
        const char *format,
        const struct tm *timeptr,
                void *lc_time_arg
        )
{
        struct __lc_time_data *lc_time;

        size_t left;                    /* space left in output string */
#ifdef _MT
        int local_lock_flag;
#endif  /* _MT */

        /* Copy maxsize into temp. */
        left = maxsize;

        _lock_locale( local_lock_flag )

        /* Defer initialization until the crtitical section has been entered */
        lc_time = lc_time_arg == 0 ? __lc_time_curr : (struct __lc_time_data *)lc_time_arg;

        /* Copy the input string to the output string expanding the format
        designations appropriately.  Stop copying when one of the following
        is true: (1) we hit a null char in the input stream, or (2) there's
        no room left in the output stream. */

        while (left > 0)
        {
                switch(*format)
                {

                case('\0'):

                        /* end of format input string */
                        goto done;

                case('%'):

                        /* Format directive.  Take appropriate action based
                        on format control character. */

                        format++;                       /* skip over % char */

                        /* process flags */
                        __alternate_form = 0;
                        if (*format == '#')
                        {
                                __alternate_form = 1;