text: /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
  /* lib/krb5/os/ustime.c */
  /*
   * Copyright 1990,1991,2007 by the Massachusetts Institute of Technology.
   * All Rights Reserved.
   *
   * Export of this software from the United States of America may
   *   require a specific license from the United States Government.
   *   It is the responsibility of any person or organization contemplating
   *   export to obtain such a license before exporting.
   *
   * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
   * distribute this software and its documentation for any purpose and
   * without fee is hereby granted, provided that the above copyright
   * notice appear in all copies and that both that copyright notice and
   * this permission notice appear in supporting documentation, and that
   * the name of M.I.T. not be used in advertising or publicity pertaining
   * to distribution of the software without specific, written prior
   * permission.  Furthermore if you modify this software you must label
   * your software as modified software and not distribute it in such a
   * fashion that it might be confused with the original M.I.T. software.
   * M.I.T. makes no representations about the suitability of
   * this software for any purpose.  It is provided "as is" without express
   * or implied warranty.
   */
  
  /*
   * krb5_crypto_us_timeofday() does all of the real work; however, we
   * handle the time offset adjustment here, since this is context
   * specific, and the crypto version of this call doesn't have access
   * to the context variable.  Fortunately the only user of
   * krb5_crypto_us_timeofday in the crypto library doesn't require that
   * this time adjustment be done.
   */
  
  #include "k5-int.h"
  #include "os-proto.h"
  
  krb5_error_code
  k5_time_with_offset(krb5_timestamp offset, krb5_int32 offset_usec,
                      krb5_timestamp *time_out, krb5_int32 *usec_out)
  {
      krb5_timestamp sec;
      krb5_int32 usec;
      krb5_error_code retval;
  
      retval = krb5_crypto_us_timeofday(&sec, &usec);
      if (retval)
          return retval;
      usec += offset_usec;
      if (usec > 1000000) {
          usec -= 1000000;
          sec = ts_incr(sec, 1);
      }
      if (usec < 0) {
          usec += 1000000;
          sec = ts_incr(sec, -1);
      }
      sec = ts_incr(sec, offset);
  
      *time_out = sec;
      *usec_out = usec;
      return 0;
  }
  
  krb5_error_code KRB5_CALLCONV
  krb5_us_timeofday(krb5_context context, krb5_timestamp *seconds,
                    krb5_int32 *microseconds)
  {
      krb5_os_context os_ctx = &context->os_context;
  
      if (os_ctx->os_flags & KRB5_OS_TOFFSET_TIME) {
          *seconds = os_ctx->time_offset;
          *microseconds = os_ctx->usec_offset;
          return 0;
      } else if (os_ctx->os_flags & KRB5_OS_TOFFSET_VALID) {
          return k5_time_with_offset(os_ctx->time_offset, os_ctx->usec_offset,
                                     seconds, microseconds);
      } else {
          return krb5_crypto_us_timeofday(seconds, microseconds);
      }
  }
  