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

/* wtime.c
* time handling routines for getting and displaying time as time_t
*
* wt2showt() - converts time_t to strings mm/dd/yyyy and hh:mm:ss
* wshowt2t() - converts strings as above to time_t
* if yyyy is a 2 digit number, 1900 is assumed
* allows for overflows (ie: 25 hours, 36 days,etc)
*
*
* PARAMETERS are same for both routines:
* time_t *t = UNIX_style time counter, seconds since 1/1/1970
* char *date = ptr to a buffer that must be AT LEAST 11 bytes
* holds, or returns mm/dd/yyyy
* char *time = ptr to a buffer that must be AT LEAST 9 bytes
* holds, or returns hh:mm:ss
*
* BEWARE!!!
* ANSI struct tm, year= yrs since 1900 (0 and up)
* mon = mons since Jan (0-11)
* day = day of the month (1-31)
* h.m.s all start at 0.
* LOCALTIME: use tzset() to pick up environment var TZ=PST8, etc...
* ANSI time_t value is # seconds since 1/1/1970
*
* DOS struct time - h, m, s all start at 0.
* DOS struct date - da_day runs 1-31, da_mon 1-12, da_year 1970=1970
*
*/
#include "wsys.h"
#include
#include

#define BUFFSZ 11


void wshowt2t (char *date, char *time, time_t *t)
{
struct tm tms;
char buff[BUFFSZ];
char *ptr;


memset (&tms, 0, sizeof (tms) );


/* break date from mm/dd/yyyy
*/
memcpy (buff, date, BUFFSZ);
buff[BUFFSZ-1] =0;
ptr = strtok (buff, "/-");
tms.tm_mon = atoi (ptr) -1; /* month goes 0-11 */
ptr = strtok (NULL, "/-");
tms.tm_mday = atoi (ptr); /* day runs 1-31 */
ptr = strtok (NULL, "/-");
tms.tm_year = atoi (ptr);

if ( tms.tm_year >1900 )
{
tms.tm_year -= 1900; /* ANSI struct tm.tm_year=0 == 1900 */
}

/* break time from hh:mm:ss
*/
memcpy (buff, time, BUFFSZ);
buff[BUFFSZ-1] =0;
ptr = strtok (buff, ".:-");
tms.tm_hour = atoi (ptr);
ptr = strtok (NULL, ".:-");
tms.tm_min = atoi (ptr);
ptr = strtok (NULL, ".:-");
tms.tm_sec = atoi (ptr);


*t = mktime ( &tms );

return; /* wt2showt */
}



void wt2showt (time_t *t, char *date, char *time)
{
struct tm tms;

tms = *localtime (t); /* convert time_t to struct tm */

tms.tm_year += 1900; /* 0 = 1900 */
tms.tm_mon += 1; /* 0 = JAN */

sprintf(date,"%2.2i/%2.2i/%2.4i", tms.tm_mon, tms.tm_mday,tms.tm_year );
sprintf(time,"%2.2i:%2.2i:%2.2i", tms.tm_hour,tms.tm_min, tms.tm_sec );

return; /* wt2showt */
}


/*---------------- end of WTIME.C -----------------*/