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time.c

/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006 Linpro AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: time.c 1096 2006-09-20 07:50:27Z des $
 *
 * Semi-trivial functions to handle HTTP header timestamps according to
 * RFC 2616 section 3.3.
 *
 * In the highly unlikely event of performance trouble, handbuilt versions
 * would likely be faster than relying on the OS time functions.
 *
 * We must parse three different formats:
 *       000000000011111111112222222222
 *       012345678901234567890123456789
 *       ------------------------------
 *    "Sun, 06 Nov 1994 08:49:37 GMT"           RFC822 & RFC1123
 *    "Sunday, 06-Nov-94 08:49:37 GMT"    RFC850
 *    "Sun Nov  6 08:49:37 1994"          ANSI-C asctime()
 *
 * And always output the RFC1123 format.
 *
 */

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

#include "libvarnish.h"

void
TIM_format(time_t t, char *p)
{
      struct tm tm;

      gmtime_r(&t, &tm);
      strftime(p, 30, "%a, %d %b %Y %T GMT", &tm);
}

/* XXX: add statistics ? */
static const char *fmts[] = {
      "%a, %d %b %Y %T GMT",  /* RFC 822 & RFC1123 */
      "%A, %d-%b-%y %T GMT",  /* RFC850 */
      "%a %b %d %T %Y", /* ANSI-C asctime() */
      NULL
};

time_t
TIM_parse(const char *p)
{
      struct tm tm;
      const char **r;

      for (r = fmts; *r != NULL; r++) {
            memset(&tm, 0, sizeof tm);
            if (strptime(p, *r, &tm) != NULL)
                  return(timegm(&tm));
      }
      return (0);
}

#ifdef TEST_DRIVER
int
main(int argc, char **argv)
{
      time_t t;
      char buf[BUFSIZ];

      time(&t);
      memset(buf, 0x55, sizeof buf);
      TIM_format(t, buf);
      printf("scan = %d <%s>\n", TIM_parse(buf), buf);

      /* Examples from RFC2616 section 3.3.1 */
      printf("scan = %d\n", TIM_parse("Sun, 06 Nov 1994 08:49:37 GMT"));
      printf("scan = %d\n", TIM_parse("Sunday, 06-Nov-94 08:49:37 GMT"));
      printf("scan = %d\n", TIM_parse("Sun Nov  6 08:49:37 1994"));

      return (0);
}
#endif

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