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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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asctime.c
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C/C++ Source or Header
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1998-06-17
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4KB
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134 lines
/***
*asctime.c - convert date/time structure to ASCII string
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Contains asctime() - convert a date/time structure to ASCII string.
*
*******************************************************************************/
#include <cruntime.h>
#include <time.h>
#include <internal.h>
#include <mtdll.h>
#ifdef _MT
#include <malloc.h>
#include <stddef.h>
#endif /* _MT */
#include <tchar.h>
#include <dbgint.h>
#define _ASCBUFSIZE 26
static _TSCHAR buf[_ASCBUFSIZE];
/*
** This prototype must be local to this file since the procedure is static
*/
static _TSCHAR * __cdecl store_dt(_TSCHAR *, int);
static _TSCHAR * __cdecl store_dt (
REG1 _TSCHAR *p,
REG2 int val
)
{
*p++ = (_TSCHAR)(_T('0') + val / 10);
*p++ = (_TSCHAR)(_T('0') + val % 10);
return(p);
}
/***
*char *asctime(time) - convert a structure time to ascii string
*
*Purpose:
* Converts a time stored in a struct tm to a charcater string.
* The string is always exactly 26 characters of the form
* Tue May 01 02:34:55 1984\n\0
*
*Entry:
* struct tm *time - ptr to time structure
*
*Exit:
* returns pointer to static string with time string.
*
*Exceptions:
*
*******************************************************************************/
_TSCHAR * __cdecl _tasctime (
REG1 const struct tm *tb
)
{
#ifdef _MT
_ptiddata ptd = _getptd();
REG2 _TSCHAR *p; /* will point to asctime buffer */
_TSCHAR *retval; /* holds retval pointer */
#else /* _MT */
REG2 _TSCHAR *p = buf;
#endif /* _MT */
int day, mon;
int i;
#ifdef _MT
/* Use per thread buffer area (malloc space, if necessary) */
#ifdef _UNICODE
if ( (ptd->_wasctimebuf != NULL) || ((ptd->_wasctimebuf =
(wchar_t *)_malloc_crt(_ASCBUFSIZE * sizeof(wchar_t))) != NULL) )
p = ptd->_wasctimebuf;
#else /* _UNICODE */
if ( (ptd->_asctimebuf != NULL) || ((ptd->_asctimebuf =
(char *)_malloc_crt(_ASCBUFSIZE * sizeof(char))) != NULL) )
p = ptd->_asctimebuf;
#endif /* _UNICODE */
else
p = buf; /* error: use static buffer */
retval = p; /* save return value for later */
#endif /* _MT */
/* copy day and month names into the buffer */
day = tb->tm_wday * 3; /* index to correct day string */
mon = tb->tm_mon * 3; /* index to correct month string */
for (i=0; i < 3; i++,p++) {
*p = *(__dnames + day + i);
*(p+4) = *(__mnames + mon + i);
}
*p = _T(' '); /* blank between day and month */
p += 4;
*p++ = _T(' ');
p = store_dt(p, tb->tm_mday); /* day of the month (1-31) */
*p++ = _T(' ');
p = store_dt(p, tb->tm_hour); /* hours (0-23) */
*p++ = _T(':');
p = store_dt(p, tb->tm_min); /* minutes (0-59) */
*p++ = _T(':');
p = store_dt(p, tb->tm_sec); /* seconds (0-59) */
*p++ = _T(' ');
p = store_dt(p, 19 + (tb->tm_year/100)); /* year (after 1900) */
p = store_dt(p, tb->tm_year%100);
*p++ = _T('\n');
*p = _T('\0');
#ifdef _MT
return (retval);
#else /* _MT */
return ((_TSCHAR *) buf);
#endif /* _MT */
}