Category : C Source Code
Archive   : WTWG12B.ZIP
Filename : WVALDATE.C

/* wvaldate.c
* validate a date string in form of mm/dd/yy or mm/dd/yyyy
*
* RETURNS: 0 if date is valid. nonzero otherwise.
* alters the date string by removing extra digits, sapces, etc...
* (never makes string longer than that provided)
*
*
*/
#include "wsys.h"

static int max_day[] = {0,31,29,31,30,31,30,31, 31,30,31,30,31};
#define NOT_LEAPYEAR(yy) ( ((yy)&3) || ( ((yy)/100)*100 ==(yy) ) )


int wval_date ( char *date )
{
int retcode =1;
unsigned int m=0,d=0,y=0;
char *ptr = date;

wdtparse ( &m, &ptr, '/' );
wdtparse ( &d, &ptr, '/' );
wdtparse ( &y, &ptr, '/' );

if ( ( (m>0) && (m<13) )
&& ( (d>0) && (d<=max_day[m]) )
&& ( (y>0) && (y<9999) )
&& (! ( (d==29) && (m==2) && NOT_LEAPYEAR(y) ) )
)
{
retcode = 0;
sprintf ( date, "%u/%u/%u", m,d,y);
}


return (retcode); /* wvdate ()*/
}

/*--------------- end of WVALDATE.C --------------------*/