/* MPFR Logging functions.

Copyright 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

The GNU MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */

#include "mpfr-impl.h"

/* Logging MPFR needs GCC >= 3.0 and GLIBC >= 2.0. */

#ifdef MPFR_USE_LOGGING

/* Can't include them before (in particular, printf.h) */
#include <stdlib.h>
#include <printf.h>
#include <stdarg.h>
#include <time.h>

/* Define LOGGING variables */

FILE *mpfr_log_file;
int   mpfr_log_type;
int   mpfr_log_level;
int   mpfr_log_base;
int   mpfr_log_current;
int   mpfr_log_worstcase_limit;
mpfr_prec_t mpfr_log_prec;

static int
mpfr_printf_mpfr_print (FILE *stream, const struct printf_info *info,
                        const void * const *arg)
{
  int length;
  int org_type_logging;

  /* TODO: Use much more flag from info  */
  mpfr_srcptr w = *((mpfr_srcptr *) (arg[0]));
  mpfr_prec_t prec = mpfr_log_prec != 0 ? mpfr_log_prec
    : info->width == -1 ? 0 : (mpfr_prec_t) info->width;

  org_type_logging = mpfr_log_type;
  mpfr_log_type = 0; /* We disable the logging during this print! */
  if (info->alt)
    length = fprintf (stream, "%lu", (unsigned long) MPFR_PREC (w));
  else
    length = mpfr_out_str (stream, mpfr_log_base, prec, w, MPFR_RNDN);
  mpfr_log_type = org_type_logging;

  return length;
}

static int
mpfr_printf_mpfr_arginfo (const struct printf_info *info, size_t n,
                          int *argtypes)
{
  if (n > 0)
    argtypes[0] = PA_POINTER;
  return 1;
}

static void mpfr_log_begin (void) __attribute__((constructor));

/* We let the system close the LOG itself
   (Otherwise functions called by destructor can't use LOG File */
static void
mpfr_log_begin (void)
{
  const char *var;
  time_t tt;

  /* Grab some information */
  var = getenv ("MPFR_LOG_BASE");
  mpfr_log_base = var == NULL || *var == 0 ? 10 : atoi (var);

  var = getenv ("MPFR_LOG_LEVEL");
  mpfr_log_level = var == NULL || *var == 0 ? 7 : atoi (var);
  mpfr_log_current = 0;

  var = getenv ("MPFR_LOG_PREC");
  mpfr_log_prec = var == NULL || *var == 0 ? 0 : atol (var);

  /* Get what we need to log */
  mpfr_log_type = 0;
  if (getenv ("MPFR_LOG_INPUT") != NULL)
    mpfr_log_type |= MPFR_LOG_INPUT_F;
  if (getenv ("MPFR_LOG_OUTPUT") != NULL)
    mpfr_log_type |= MPFR_LOG_OUTPUT_F;
  if (getenv ("MPFR_LOG_TIME") != NULL)
    mpfr_log_type |= MPFR_LOG_TIME_F;
  if (getenv ("MPFR_LOG_INTERNAL") != NULL)
    mpfr_log_type |= MPFR_LOG_INTERNAL_F;
  if (getenv ("MPFR_LOG_MSG") != NULL)
    mpfr_log_type |= MPFR_LOG_MSG_F;
  if (getenv ("MPFR_LOG_ZIV") != NULL)
    mpfr_log_type |= MPFR_LOG_BADCASE_F;
  if (getenv ("MPFR_LOG_STAT") != NULL)
    mpfr_log_type |= MPFR_LOG_STAT_F;
  if (getenv ("MPFR_LOG_ALL") != NULL)
    mpfr_log_type = MPFR_LOG_INPUT_F|MPFR_LOG_OUTPUT_F|MPFR_LOG_TIME_F
      |MPFR_LOG_INTERNAL_F|MPFR_LOG_MSG_F|MPFR_LOG_BADCASE_F|MPFR_LOG_STAT_F;

  /* Register printf functions */
  register_printf_function ('R', mpfr_printf_mpfr_print,
                            mpfr_printf_mpfr_arginfo);

  /* Open filename if needed */
  var = getenv ("MPFR_LOG_FILE");
  if (var == NULL || *var == 0)
    var = "mpfr.log";
  if (mpfr_log_type != 0)
    {
      mpfr_log_file = fopen (var, "w");
      if (mpfr_log_file == NULL)
        {
          fprintf (stderr, "MPFR LOG: Can't open '%s' with w.\n", var);
          abort ();
        }
      time (&tt);
      fprintf (mpfr_log_file, "MPFR LOG FILE %s\n", ctime (&tt));
    }
}

/* Return user CPU time measured in milliseconds. Thanks to Torbjorn. */

#if defined (ANSIONLY) || defined (USG) || defined (__SVR4) \
 || defined (_UNICOS) || defined(__hpux)

int
mpfr_get_cputime (void)
{
  return (int) ((unsigned long long) clock () * 1000 / CLOCKS_PER_SEC);
}

#else /* Use getrusage for cputime */

#include <sys/types.h>
#include <sys/resource.h>

int
mpfr_get_cputime (void)
{
  struct rusage rus;
  getrusage (0, &rus);
  return rus.ru_utime.tv_sec * 1000 + rus.ru_utime.tv_usec / 1000;
}

#endif /* cputime */

#endif /* MPFR_USE_LOGGING */
