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SETTIME.C
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─────Run-Time Library───────────────────────────────────────────────────────
/* SETTIME.C illustrates getting and setting the DOS time and date using:
* _dos_gettime _dos_settime _dos_getdate _dos_setdate
* (DOS-only)
* Formatted input to a string is illustrated using:
* sscanf
*
* See TABLE.C (fscanf) and SCANF.C for other examples of formatted input.
*/
#include <dos.h>
#include <stdio.h>
#include <conio.h>
#include <string.h>
struct _dosdate_t ddate;
struct _dostime_t dtime;
void main()
{
unsigned tmpday, tmpmonth, tmpyear;
unsigned tmphour, tmpminute, tmpsecond;
char *days[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
char tmpbuf[20];
/* Get current date. */
_dos_getdate( &ddate );
printf( "Date: %u/%02u/%02u %s\n",
ddate.month, ddate.day, ddate.year - 1900,
days[ddate.dayofweek] );
printf( "Enter new date: " );
/* Get a date string and if it's not 0 (for CR), assign it to date. */
gets( tmpbuf );
if( strlen( tmpbuf ) )
{
/* NOTE: You must read the month and day into a temporary unsigned
* variable. If you try to read directly into the unsigned char
* values ddate.day or ddate.month, sscanf (or scanf) will read a
* word, thus overriding adjacent bytes.
*/
sscanf( tmpbuf, "%u/%u/%u", &tmpmonth, &tmpday, &tmpyear );
if( (tmpyear - 80) <= 20 )
ddate.year = tmpyear + 1900;
else if( (tmpyear >= 1980) && (tmpyear <= 2099 ) )
ddate.year = tmpyear;
if( (tmpmonth + 1) <= 13 )
ddate.month = (unsigned char)tmpmonth;
if( (tmpday + 1) <= 32 )
ddate.day = (unsigned char)tmpday;
_dos_setdate( &ddate );
_dos_getdate( &ddate );
printf( "New date: %u/%02u/%02u %s\n",
ddate.month, ddate.day, ddate.year - 1900,
days[ddate.dayofweek] );
}
/* Get current time. */
_dos_gettime( &dtime );
printf( "Time: %u:%02u:%02u\n", dtime.hour, dtime.minute, dtime.second );
printf( "Enter new time: " );
/* Get a time string and if it's not 0 (for CR), assign it to time. */
gets( tmpbuf );
if( strlen( tmpbuf ) )
{
sscanf( tmpbuf, "%u:%u:%u", &tmphour, &tmpminute, &tmpsecond );
if( tmphour < 24 )
dtime.hour = (unsigned char)tmphour;
if( tmpminute < 60 )
dtime.minute = (unsigned char)tmpminute;
if( tmpsecond < 60 )
dtime.second = (unsigned char)tmpsecond;
_dos_settime( &dtime );
_dos_gettime( &dtime );
printf( "New time: %u:%02u:%02u\n",
dtime.hour, dtime.minute, dtime.second );
}
}
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