From:	Myron Seto <myron_seto AT hotmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Question (beginner's): strptime
Date:	Thu, 23 Sep 1999 12:30:51 GMT
Organization:	Deja.com - Share what you know. Learn what you don't.
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To:	djgpp AT delorie DOT com
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Here's a program to calculate the number of days between two dates.
But it won't compile because of "strptime" which is not defined in
djgpp.  Can someone help me to correct this problem?
Thanks, myron_seto AT hotmail DOT com


----

#include <stdio.h>
#include <string.h>
#include <time.h>

const char *format = "%x";
const long secondsperday = (24 * 60 * 60);

static char *program;

void usage(void);

int main(int argc, char *argv[])
{
  struct tm first, second;

  if ( NULL == (program = strrchr(argv[0], '/')) )
    program = argv[0];
  else
    program++;

  if ( 3 != argc ) {
    usage();
    exit(1);
  }

  if ( NULL == strptime(argv[1], format, &first) ) {
    usage();
    exit(1);
  }

  if ( NULL == strptime(argv[2], format, &second) ) {
    usage();
    exit(1);
  }

  printf("%d\n", (mktime(&second) - mktime(&first)) / secondsperday);
}

void usage()
{
  fprintf(stderr, "usage: %s %s %s\n", program, format, format);
  fprintf(stderr, "\t see man date for more info\n");
}


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