dist/tests/tfprintf.c

/* tfprintf.c -- test file for mpfr_fprintf and mpfr_vfprintf

Copyright 2008-2020 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
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */

/* FIXME: The output is not tested (thus coverage data are meaningless).
   For instance, slightly changing the code of mpfr_fprintf does not
   trigger any failure in the test suite.
   Knowing the implementation, we may need only some minimal checks:
   all the formatted output functions are based on mpfr_vasnprintf_aux
   and full checks are done via tsprintf. */

/* Needed due to the tests on HAVE_STDARG and MPFR_USE_MINI_GMP */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#if defined(HAVE_STDARG) && !defined(MPFR_USE_MINI_GMP)
#include <stdarg.h>

#include <float.h>
#include <stddef.h>

#define MPFR_NEED_INTMAX_H
#include "mpfr-test.h"

#define QUOTE(X) NAME(X)
#define NAME(X) #X

#define check_length(num_test, var, value, var_spec)                    \
  if ((var) != (value))                                                 \
    {                                                                   \
      printf ("Error in test #%d: mpfr_vfprintf printed %"QUOTE(var_spec) \
              " characters instead of %d\n", (num_test), (var), (value)); \
      exit (1);                                                         \
    }

#define check_length_with_cmp(num_test, var, value, cmp, var_spec)      \
  if (cmp != 0)                                                         \
    {                                                                   \
      mpfr_printf ("Error in test #%d, mpfr_vfprintf printed %"         \
                   QUOTE(var_spec)" characters instead of %d\n",        \
                   (num_test), (var), (value));                         \
      exit (1);                                                         \
    }

/* limit for random precision in random() */
const int prec_max_printf = 5000;

static void
check (FILE *fout, const char *fmt, mpfr_t x)
{
  if (mpfr_fprintf (fout, fmt, x) == -1)
    {
      mpfr_printf ("Error in mpfr_fprintf(fout, \"%s\", %Re)\n",
                   fmt, x);
      exit (1);
    }
  fputc ('\n', fout);
}

static void
check_vfprintf (FILE *fout, const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  if (mpfr_vfprintf (fout, fmt, ap) == -1)
    {
      mpfr_printf ("Error in mpfr_vfprintf(fout, \"%s\", ...)\n", fmt);

      va_end (ap);
      exit (1);
    }

  va_end (ap);
  fputc ('\n', fout);
}

static void
check_special (FILE *fout)
{
  mpfr_t x;

  mpfr_init (x);

  mpfr_set_inf (x, 1);
  check (fout, "%Ra", x);
  check (fout, "%Rb", x);
  check (fout, "%Re", x);
  check (fout, "%Rf", x);
  check (fout, "%Rg", x);
  check_vfprintf (fout, "%Ra", x);
  check_vfprintf (fout, "%Rb", x);
  check_vfprintf (fout, "%Re", x);
  check_vfprintf (fout, "%Rf", x);
  check_vfprintf (fout, "%Rg", x);

  mpfr_set_inf (x, -1);
  check (fout, "%Ra", x);
  check (fout, "%Rb", x);
  check (fout, "%Re", x);
  check (fout, "%Rf", x);
  check (fout, "%Rg", x);
  check_vfprintf (fout, "%Ra", x);
  check_vfprintf (fout, "%Rb", x);
  check_vfprintf (fout, "%Re", x);
  check_vfprintf (fout, "%Rf", x);
  check_vfprintf (fout, "%Rg", x);

  mpfr_set_nan (x);
  check (fout, "%Ra", x);
  check (fout, "%Rb", x);
  check (fout, "%Re", x);
  check (fout, "%Rf", x);
  check (fout, "%Rg", x);
  check_vfprintf (fout, "%Ra", x);
  check_vfprintf (fout, "%Rb", x);
  check_vfprintf (fout, "%Re", x);
  check_vfprintf (fout, "%Rf", x);
  check_vfprintf (fout, "%Rg", x);

  mpfr_clear (x);
}

static void
check_mixed (FILE *fout)
{
  int ch = 'a';
#ifndef NPRINTF_HH
  signed char sch = -1;
  unsigned char uch = 1;
#endif
  short sh = -1;
  unsigned short ush = 1;
  int i = -1;
  int j = 1;
  unsigned int ui = 1;
  long lo = -1;
  unsigned long ulo = 1;
  float f = -1.25;
  double d = -1.25;
#if defined(PRINTF_T) || defined(PRINTF_L)
  long double ld = -1.25;
#endif

#ifdef PRINTF_T
  ptrdiff_t p = 1, saved_p;
#endif
  size_t sz = 1;

  mpz_t mpz;
  mpq_t mpq;
  mpf_t mpf;
  mpfr_rnd_t rnd = MPFR_RNDN;

  mp_size_t limb_size = 3;
  mp_limb_t limb[3];

  mpfr_t mpfr;
  mpfr_prec_t prec = 53;

  mpz_init (mpz);
  mpz_set_ui (mpz, ulo);
  mpq_init (mpq);
  mpq_set_si (mpq, lo, ulo);
  mpf_init (mpf);
  mpf_set_q (mpf, mpq);

  mpfr_init2 (mpfr, prec);
  mpfr_set_f (mpfr, mpf, MPFR_RNDN);

  limb[0] = limb[1] = limb[2] = MPFR_LIMB_MAX;

  check_vfprintf (fout, "a. %Ra, b. %u, c. %lx%n", mpfr, ui, ulo, &j);
  check_length (1, j, 22, d);
  check_vfprintf (fout, "a. %c, b. %Rb, c. %u, d. %li%ln", i, mpfr, i,
                  lo, &ulo);
  check_length (2, ulo, 36, lu);
  check_vfprintf (fout, "a. %hi, b. %*f, c. %Re%hn", ush, 3, f, mpfr, &ush);
  check_length (3, ush, 46, hu);
  check_vfprintf (fout, "a. %hi, b. %f, c. %#.2Rf%n", sh, d, mpfr, &i);
  check_length (4, i, 29, d);
  check_vfprintf (fout, "a. %R*A, b. %Fe, c. %i%zn", rnd, mpfr, mpf, sz,
                  &sz);
  check_length (5, (unsigned long) sz, 34, lu); /* no format specifier "%zu" in C89 */
  check_vfprintf (fout, "a. %Pu, b. %c, c. %Zi%Zn", prec, ch, mpz, &mpz);
  check_length_with_cmp (6, mpz, 17, mpz_cmp_ui (mpz, 17), Zi);
  check_vfprintf (fout, "%% a. %#.0RNg, b. %Qx%Rn, c. %p", mpfr, mpq, &mpfr,
                  (void *) &i);
  check_length_with_cmp (7, mpfr, 15, mpfr_cmp_ui (mpfr, 15), Rg);

#ifdef PRINTF_T
  saved_p = p;
  check_vfprintf (fout, "%% a. %RNg, b. %Qx, c. %td%tn", mpfr, mpq, p, &p);
  if (p != 20)
    {
      mpfr_fprintf (stderr, "Error in test 8, got '%% a. %RNg, b. %Qx, c. %td'\n", mpfr, mpq, saved_p);
#if defined(__MINGW32__) || defined(__MINGW64__)
      fprintf (stderr,
               "Your MinGW may be too old, in which case compiling GMP\n"
               "with -D__USE_MINGW_ANSI_STDIO might be required.\n");
#endif
    }
  check_length (8, (long) p, 20, ld); /* no format specifier "%td" in C89 */
#endif

#ifdef PRINTF_L
  check_vfprintf (fout, "a. %RA, b. %Lf, c. %QX%zn", mpfr, ld, mpq, &sz);
  check_length (9, (unsigned long) sz, 30, lu); /* no format specifier "%zu" in C89 */
#endif

#ifndef NPRINTF_HH
  check_vfprintf (fout, "a. %hhi, b. %RA, c. %hhu%hhn", sch, mpfr, uch, &uch);
  check_length (10, (unsigned int) uch, 22, u); /* no format specifier "%hhu" in C89 */
#endif

#if (__GNU_MP_VERSION * 10 + __GNU_MP_VERSION_MINOR) >= 42
  /* The 'M' specifier was added in gmp 4.2.0 */
  check_vfprintf (fout, "a. %Mx b. %Re%Mn", limb[0], mpfr, &limb[0]);
  if (limb[0] != 29 + GMP_NUMB_BITS / 4 ||
      limb[1] != MPFR_LIMB_MAX ||
      limb[2] != MPFR_LIMB_MAX)
    {
      printf ("Error in test #11: mpfr_vfprintf did not print %d characters"
              " as expected\n", 29 + (int) GMP_NUMB_BITS / 4);
      exit (1);
    }

  limb[0] = MPFR_LIMB_MAX;
  /* we tell vfprintf that limb array is 2 cells wide
     and check it doesn't go through */
  check_vfprintf (fout, "a. %Re .b %Nx%Nn", mpfr, limb, limb_size, limb,
                  limb_size - 1);
  if (limb[0] != 29 + 3 * GMP_NUMB_BITS / 4 ||
      limb[1] != MPFR_LIMB_ZERO ||
      limb[2] != MPFR_LIMB_MAX)
    {
      printf ("Error in test #12: mpfr_vfprintf did not print %d characters"
              " as expected\n", 29 + (int) GMP_NUMB_BITS / 4);
      exit (1);
    }
#endif

#if defined(HAVE_LONG_LONG) && !defined(NPRINTF_LL)
  {
    long long llo = -1;
    unsigned long long ullo = 1;

    check_vfprintf (fout, "a. %Re, b. %llx%Qn", mpfr, ullo, &mpq);
    check_length_with_cmp (21, mpq, 31, mpq_cmp_ui (mpq, 31, 1), Qu);
    check_vfprintf (fout, "a. %lli, b. %Rf%Fn", llo, mpfr, &mpf);
    check_length_with_cmp (22, mpf, 19, mpf_cmp_ui (mpf, 19), Fg);
  }
#endif

#if defined(_MPFR_H_HAVE_INTMAX_T) && !defined(NPRINTF_J)
  {
    intmax_t im = -1;
    uintmax_t uim = 1;

    check_vfprintf (fout, "a. %*RA, b. %ji%Qn", 10, mpfr, im, &mpq);
    check_length_with_cmp (31, mpq, 20, mpq_cmp_ui (mpq, 20, 1), Qu);
    check_vfprintf (fout, "a. %.*Re, b. %jx%Fn", 10, mpfr, uim, &mpf);
    check_length_with_cmp (32, mpf, 25, mpf_cmp_ui (mpf, 25), Fg);
  }
#endif

  mpfr_clear (mpfr);
  mpf_clear (mpf);
  mpq_clear (mpq);
  mpz_clear (mpz);
}

static void
check_random (FILE *fout, int nb_tests)
{
  int i;
  mpfr_t x;
  mpfr_rnd_t rnd;
  char flag[] =
    {
      '-',
      '+',
      ' ',
      '#',
      '0', /* no ambiguity: first zeros are flag zero*/
      '\''
    };
  char specifier[] =
    {
      'a',
      'b',
      'e',
      'f',
      'g'
    };
  mpfr_exp_t old_emin, old_emax;

  old_emin = mpfr_get_emin ();
  old_emax = mpfr_get_emax ();

  mpfr_init (x);

  for (i = 0; i < nb_tests; ++i)
    {
      int ret;
      int j, jmax;
      int spec, prec;
#define FMT_SIZE 13
      char fmt[FMT_SIZE]; /* at most something like "%-+ #0'.*R*f" */
      char *ptr = fmt;

      tests_default_random (x, 256, MPFR_EMIN_MIN, MPFR_EMAX_MAX, 0);
      rnd = RND_RAND ();

      spec = (int) (randlimb () % 5);
      jmax = (spec == 3 || spec == 4) ? 6 : 5; /* ' flag only with %f or %g */
      /* advantage small precision */
      prec = (int) (randlimb () % ((randlimb () % 2) ? 10 : prec_max_printf));
      if (spec == 3
          && (mpfr_get_exp (x) > prec_max_printf
              || mpfr_get_exp (x) < -prec_max_printf))
        /*  change style 'f' to style 'e' when number x is large */
        --spec;

      *ptr++ = '%';
      for (j = 0; j < jmax; j++)
        {
          if (randlimb () % 3 == 0)
            *ptr++ = flag[j];
        }
      *ptr++ = '.';
      *ptr++ = '*';
      *ptr++ = 'R';
      *ptr++ = '*';
      *ptr++ = specifier[spec];
      *ptr = '\0';
      MPFR_ASSERTD (ptr - fmt < FMT_SIZE);

      mpfr_fprintf (fout, "mpfr_fprintf(fout, \"%s\", %d, %s, %Re)\n",
                    fmt, prec, mpfr_print_rnd_mode (rnd), x);
      ret = mpfr_fprintf (fout, fmt, prec, rnd, x);
      if (ret == -1)
        {
          if (spec == 3
              && (MPFR_GET_EXP (x) > INT_MAX || MPFR_GET_EXP (x) < -INT_MAX))
            /* normal failure: x is too large to be output with full precision */
            {
              mpfr_fprintf (fout, "too large !");
            }
          else
            {
              mpfr_printf ("Error in mpfr_fprintf(fout, \"%s\", %d, %s, %Re)\n",
                           fmt, prec, mpfr_print_rnd_mode (rnd), x);
              exit (1);
            }
        }
      mpfr_fprintf (fout, "\n");
    }

  mpfr_set_emin (old_emin);
  mpfr_set_emax (old_emax);

  mpfr_clear (x);
}

static void
bug_20090316 (FILE *fout)
{
  mpfr_t x;

  mpfr_init2 (x, 53);

  /* bug 20090316: fixed in r6112 */
  mpfr_set_ui_2exp (x, 0x60fa2916, -30, MPFR_RNDN);
  check (fout, "%-#.4095RDg\n", x);

  mpfr_clear (x);
}

int
main (int argc, char *argv[])
{
  FILE *fout;
  int N;

  tests_start_mpfr ();

  /* with no argument: prints to /dev/null,
     tfprintf N: prints N tests to stdout */
  if (argc == 1)
    {
      N = 1000;
      fout = fopen ("/dev/null", "w");
      /* If we failed to open this device, try with a dummy file */
      if (fout == NULL)
        {
          fout = fopen ("tfprintf_out.txt", "w");

          if (fout == NULL)
            {
              printf ("Can't open /dev/null or a temporary file\n");
              exit (1);
            }
        }
    }
  else
    {
      fout = stdout;
      N = atoi (argv[1]);
    }

  check_special (fout);
  check_mixed (fout);
  check_random (fout, N);

  bug_20090316 (fout);

  fclose (fout);
  tests_end_mpfr ();
  return 0;
}

#else  /* HAVE_STDARG */

int
main (void)
{
  /* We have nothing to test. */
  return 77;
}

#endif  /* HAVE_STDARG */