/* mpfr_printf -- printf function and friends.

Copyright 2007-2016 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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. */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/* The mpfr_printf-like functions are defined only if <stdarg.h> exists */
#ifdef HAVE_STDARG

#include <stdarg.h>

#ifndef HAVE_VA_COPY
# ifdef HAVE___VA_COPY
#  define va_copy(dst,src) __va_copy(dst, src)
# else
/* autoconf manual advocates this fallback.
   This is also the solution chosen by gmp */
#  define va_copy(dst,src) \
  do { memcpy(&(dst), &(src), sizeof(va_list)); } while (0)
# endif /* HAVE___VA_COPY */
#endif /* HAVE_VA_COPY */

#include <errno.h>
#include "mpfr-impl.h"

#ifdef _MPFR_H_HAVE_FILE

/* Each printf-like function calls mpfr_vasprintf which
   - returns the number of characters in the returned string excluding the
   terminating null
   - returns -1 and sets the erange flag if the number of produced characters
   exceeds INT_MAX (in that case, also sets errno to EOVERFLOW in POSIX
   systems) */

#define GET_STR_VA(sz, str, fmt, ap)            \
  do                                            \
    {                                           \
      sz = mpfr_vasprintf (&(str), fmt, ap);    \
      if (sz < 0)                               \
        {                                       \
          if (str)                              \
            mpfr_free_str (str);                \
          return -1;                            \
        }                                       \
    } while (0)

#define GET_STR(sz, str, fmt)                   \
  do                                            \
    {                                           \
      va_list ap;                               \
      va_start(ap, fmt);                        \
      sz = mpfr_vasprintf (&(str), fmt, ap);    \
      va_end (ap);                              \
      if (sz < 0)                               \
        {                                       \
          if (str)                              \
            mpfr_free_str (str);                \
          return -1;                            \
        }                                       \
    } while (0)

int
mpfr_printf (const char *fmt, ...)
{
  char *str;
  int ret;

  GET_STR (ret, str, fmt);
  ret = printf ("%s", str);

  mpfr_free_str (str);
  return ret;
}

int
mpfr_vprintf (const char *fmt, va_list ap)
{
  char *str;
  int ret;

  GET_STR_VA (ret, str, fmt, ap);
  ret = printf ("%s", str);

  mpfr_free_str (str);
  return ret;
}


int
mpfr_fprintf (FILE *fp, const char *fmt, ...)
{
  char *str;
  int ret;

  GET_STR (ret, str, fmt);
  ret = fprintf (fp, "%s", str);

  mpfr_free_str (str);
  return ret;
}

int
mpfr_vfprintf (FILE *fp, const char *fmt, va_list ap)
{
  char *str;
  int ret;

  GET_STR_VA (ret, str, fmt, ap);
  ret = fprintf (fp, "%s", str);

  mpfr_free_str (str);
  return ret;
}
#endif /* _MPFR_H_HAVE_FILE */

int
mpfr_sprintf (char *buf, const char *fmt, ...)
{
  char *str;
  int ret;

  GET_STR (ret, str, fmt);
  ret = sprintf (buf, "%s", str);

  mpfr_free_str (str);
  return ret;
}

int
mpfr_vsprintf (char *buf, const char *fmt, va_list ap)
{
  char *str;
  int ret;

  GET_STR_VA (ret, str, fmt, ap);
  ret = sprintf (buf, "%s", str);

  mpfr_free_str (str);
  return ret;
}

int
mpfr_snprintf (char *buf, size_t size, const char *fmt, ...)
{
  char *str;
  int ret;
  size_t min_size;

  GET_STR (ret, str, fmt);

  /* C99 allows SIZE to be zero */
  if (size != 0)
    {
      MPFR_ASSERTN (buf != NULL);
      min_size = (size_t)ret < size ? (size_t)ret : size - 1;
      strncpy (buf, str, min_size);
      buf[min_size] = '\0';
    }

  mpfr_free_str (str);
  return ret;
}

int
mpfr_vsnprintf (char *buf, size_t size, const char *fmt, va_list ap)
{
  char *str;
  int ret;
  int min_size;

  GET_STR_VA (ret, str, fmt, ap);

  /* C99 allows SIZE to be zero */
  if (size != 0)
    {
      MPFR_ASSERTN (buf != NULL);
      min_size = (size_t)ret < size ? (size_t)ret : size - 1;
      strncpy (buf, str, min_size);
      buf[min_size] = '\0';
    }

  mpfr_free_str (str);
  return ret;
}

int
mpfr_asprintf (char **pp, const char *fmt, ...)
{
  int ret;

  GET_STR (ret, *pp, fmt);

  return ret;
}
#endif /* HAVE_STDARG */
