# printf.m4 serial 61

dnl Copyright (C) 2003, 2007-2019 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl Test whether the *printf family of functions supports the 'j', 'z', 't',

dnl 'L' size specifiers. (ISO C99, POSIX:2001)

dnl Result is gl_cv_func_printf_sizes_c99.

AC_DEFUN([gl_PRINTF_SIZES_C99],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([gl_AC_HEADER_STDINT_H])

  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports size specifiers as in C99],

    [gl_cv_func_printf_sizes_c99],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stddef.h>

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#if HAVE_STDINT_H_WITH_UINTMAX

# include <stdint.h>

#endif

#if HAVE_INTTYPES_H_WITH_UINTMAX

# include <inttypes.h>

#endif

static char buf[100];

int main ()

{

  int result = 0;

#if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX

  buf[0] = '\0';

  if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0

      || strcmp (buf, "12345671 33") != 0)

    result |= 1;

#else

  result |= 1;

#endif

  buf[0] = '\0';

  if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0

      || strcmp (buf, "12345672 33") != 0)

    result |= 2;

  buf[0] = '\0';

  if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0

      || strcmp (buf, "12345673 33") != 0)

    result |= 4;

  buf[0] = '\0';

  if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0

      || strcmp (buf, "1.5 33") != 0)

    result |= 8;

  return result;

}]])],

        [gl_cv_func_printf_sizes_c99=yes],

        [gl_cv_func_printf_sizes_c99=no],

        [

         case "$host_os" in

changequote(,)dnl

                                 # Guess yes on glibc systems.

           *-gnu* | gnu*)        gl_cv_func_printf_sizes_c99="guessing yes";;

                                 # Guess yes on musl systems.

           *-musl*)              gl_cv_func_printf_sizes_c99="guessing yes";;

                                 # Guess yes on FreeBSD >= 5.

           freebsd[1-4].*)       gl_cv_func_printf_sizes_c99="guessing no";;

           freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;

                                 # Guess yes on Mac OS X >= 10.3.

           darwin[1-6].*)        gl_cv_func_printf_sizes_c99="guessing no";;

           darwin*)              gl_cv_func_printf_sizes_c99="guessing yes";;

                                 # Guess yes on OpenBSD >= 3.9.

           openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)

                                 gl_cv_func_printf_sizes_c99="guessing no";;

           openbsd*)             gl_cv_func_printf_sizes_c99="guessing yes";;

                                 # Guess yes on Solaris >= 2.10.

           solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;

           solaris*)             gl_cv_func_printf_sizes_c99="guessing no";;

                                 # Guess yes on NetBSD >= 3.

           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)

                                 gl_cv_func_printf_sizes_c99="guessing no";;

           netbsd*)              gl_cv_func_printf_sizes_c99="guessing yes";;

                                 # Guess yes on Android.

           linux*-android*)      gl_cv_func_printf_sizes_c99="guessing yes";;

changequote([,])dnl

                                 # Guess yes on MSVC, no on mingw.

           mingw*)               AC_EGREP_CPP([Known], [

#ifdef _MSC_VER

 Known

#endif

                                   ],

                                   [gl_cv_func_printf_sizes_c99="guessing yes"],

                                   [gl_cv_func_printf_sizes_c99="guessing no"])

                                 ;;

                                 # If we don't know, assume the worst.

           *)                    gl_cv_func_printf_sizes_c99="guessing no";;

         esac

        ])

    ])

])

dnl Test whether the *printf family of functions supports 'long double'

dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001)

dnl Result is gl_cv_func_printf_long_double.

AC_DEFUN([gl_PRINTF_LONG_DOUBLE],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports 'long double' arguments],

    [gl_cv_func_printf_long_double],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stdio.h>

#include <string.h>

static char buf[10000];

int main ()

{

  int result = 0;

  buf[0] = '\0';

  if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0

      || strcmp (buf, "1.750000 33") != 0)

    result |= 1;

  buf[0] = '\0';

  if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0

      || strcmp (buf, "1.750000e+00 33") != 0)

    result |= 2;

  buf[0] = '\0';

  if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0

      || strcmp (buf, "1.75 33") != 0)

    result |= 4;

  return result;

}]])],

        [gl_cv_func_printf_long_double=yes],

        [gl_cv_func_printf_long_double=no],

        [case "$host_os" in

                            # Guess no on BeOS.

           beos*)           gl_cv_func_printf_long_double="guessing no";;

                            # Guess yes on Android.

           linux*-android*) gl_cv_func_printf_long_double="guessing yes";;

                            # Guess yes on MSVC, no on mingw.

           mingw*)          AC_EGREP_CPP([Known], [

#ifdef _MSC_VER

 Known

#endif

                              ],

                              [gl_cv_func_printf_long_double="guessing yes"],

                              [gl_cv_func_printf_long_double="guessing no"])

                            ;;

           *)               gl_cv_func_printf_long_double="guessing yes";;

         esac

        ])

    ])

])

dnl Test whether the *printf family of functions supports infinite and NaN

dnl 'double' arguments and negative zero arguments in the %f, %e, %g

dnl directives. (ISO C99, POSIX:2001)

dnl Result is gl_cv_func_printf_infinite.

AC_DEFUN([gl_PRINTF_INFINITE],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],

    [gl_cv_func_printf_infinite],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stdio.h>

#include <string.h>

static int

strisnan (const char *string, size_t start_index, size_t end_index)

{

  if (start_index < end_index)

    {

      if (string[start_index] == '-')

        start_index++;

      if (start_index + 3 <= end_index

          && memcmp (string + start_index, "nan", 3) == 0)

        {

          start_index += 3;

          if (start_index == end_index

              || (string[start_index] == '(' && string[end_index - 1] == ')'))

            return 1;

        }

    }

  return 0;

}

static int

have_minus_zero ()

{

  static double plus_zero = 0.0;

  double minus_zero = - plus_zero;

  return memcmp (&plus_zero, &minus_zero, sizeof (double)) != 0;

}

static char buf[10000];

static double zero = 0.0;

int main ()

{

  int result = 0;

  if (sprintf (buf, "%f", 1.0 / zero) < 0

      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%f", -1.0 / zero) < 0

      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%f", zero / zero) < 0

      || !strisnan (buf, 0, strlen (buf)))

    result |= 2;

  if (sprintf (buf, "%e", 1.0 / zero) < 0

      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))

    result |= 4;

  if (sprintf (buf, "%e", -1.0 / zero) < 0

      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))

    result |= 4;

  if (sprintf (buf, "%e", zero / zero) < 0

      || !strisnan (buf, 0, strlen (buf)))

    result |= 8;

  if (sprintf (buf, "%g", 1.0 / zero) < 0

      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))

    result |= 16;

  if (sprintf (buf, "%g", -1.0 / zero) < 0

      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))

    result |= 16;

  if (sprintf (buf, "%g", zero / zero) < 0

      || !strisnan (buf, 0, strlen (buf)))

    result |= 32;

  /* This test fails on HP-UX 10.20.  */

  if (have_minus_zero ())

    if (sprintf (buf, "%g", - zero) < 0

        || strcmp (buf, "-0") != 0)

    result |= 64;

  return result;

}]])],

        [gl_cv_func_printf_infinite=yes],

        [gl_cv_func_printf_infinite=no],

        [

         case "$host_os" in

changequote(,)dnl

                                 # Guess yes on glibc systems.

           *-gnu* | gnu*)        gl_cv_func_printf_infinite="guessing yes";;

                                 # Guess yes on musl systems.

           *-musl*)              gl_cv_func_printf_infinite="guessing yes";;

                                 # Guess yes on FreeBSD >= 6.

           freebsd[1-5].*)       gl_cv_func_printf_infinite="guessing no";;

           freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;

                                 # Guess yes on Mac OS X >= 10.3.

           darwin[1-6].*)        gl_cv_func_printf_infinite="guessing no";;

           darwin*)              gl_cv_func_printf_infinite="guessing yes";;

                                 # Guess yes on HP-UX >= 11.

           hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;

           hpux*)                gl_cv_func_printf_infinite="guessing yes";;

                                 # Guess yes on NetBSD >= 3.

           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)

                                 gl_cv_func_printf_infinite="guessing no";;

           netbsd*)              gl_cv_func_printf_infinite="guessing yes";;

                                 # Guess yes on BeOS.

           beos*)                gl_cv_func_printf_infinite="guessing yes";;

                                 # Guess no on Android.

           linux*-android*)      gl_cv_func_printf_infinite="guessing no";;

changequote([,])dnl

                                 # Guess yes on MSVC, no on mingw.

           mingw*)               AC_EGREP_CPP([Known], [

#ifdef _MSC_VER

 Known

#endif

                                   ],

                                   [gl_cv_func_printf_infinite="guessing yes"],

                                   [gl_cv_func_printf_infinite="guessing no"])

                                 ;;

                                 # If we don't know, assume the worst.

           *)                    gl_cv_func_printf_infinite="guessing no";;

         esac

        ])

    ])

])

dnl Test whether the *printf family of functions supports infinite and NaN

dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)

dnl Result is gl_cv_func_printf_infinite_long_double.

AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],

[

  AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([gl_BIGENDIAN])

  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  dnl The user can set or unset the variable gl_printf_safe to indicate

  dnl that he wishes a safe handling of non-IEEE-754 'long double' values.

  if test -n "$gl_printf_safe"; then

    AC_DEFINE([CHECK_PRINTF_SAFE], [1],

      [Define if you wish *printf() functions that have a safe handling of

       non-IEEE-754 'long double' values.])

  fi

  case "$gl_cv_func_printf_long_double" in

    *yes)

      AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],

        [gl_cv_func_printf_infinite_long_double],

        [

          AC_RUN_IFELSE(

            [AC_LANG_SOURCE([[

]GL_NOCRASH[

#include <float.h>

#include <stdio.h>

#include <string.h>

static int

strisnan (const char *string, size_t start_index, size_t end_index)

{

  if (start_index < end_index)

    {

      if (string[start_index] == '-')

        start_index++;

      if (start_index + 3 <= end_index

          && memcmp (string + start_index, "nan", 3) == 0)

        {

          start_index += 3;

          if (start_index == end_index

              || (string[start_index] == '(' && string[end_index - 1] == ')'))

            return 1;

        }

    }

  return 0;

}

static char buf[10000];

static long double zeroL = 0.0L;

int main ()

{

  int result = 0;

  nocrash_init();

  if (sprintf (buf, "%Lf", 1.0L / zeroL) < 0

      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%Lf", -1.0L / zeroL) < 0

      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%Lf", zeroL / zeroL) < 0

      || !strisnan (buf, 0, strlen (buf)))

    result |= 1;

  if (sprintf (buf, "%Le", 1.0L / zeroL) < 0

      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%Le", -1.0L / zeroL) < 0

      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%Le", zeroL / zeroL) < 0

      || !strisnan (buf, 0, strlen (buf)))

    result |= 1;

  if (sprintf (buf, "%Lg", 1.0L / zeroL) < 0

      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%Lg", -1.0L / zeroL) < 0

      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))

    result |= 1;

  if (sprintf (buf, "%Lg", zeroL / zeroL) < 0

      || !strisnan (buf, 0, strlen (buf)))

    result |= 1;

#if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE

/* Representation of an 80-bit 'long double' as an initializer for a sequence

   of 'unsigned int' words.  */

# ifdef WORDS_BIGENDIAN

#  define LDBL80_WORDS(exponent,manthi,mantlo) \

     { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \

       ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16),   \

       (unsigned int) (mantlo) << 16                                        \

     }

# else

#  define LDBL80_WORDS(exponent,manthi,mantlo) \

     { mantlo, manthi, exponent }

# endif

  { /* Quiet NaN.  */

    static union { unsigned int word[4]; long double value; } x =

      { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };

    if (sprintf (buf, "%Lf", x.value) < 0

        || !strisnan (buf, 0, strlen (buf)))

      result |= 2;

    if (sprintf (buf, "%Le", x.value) < 0

        || !strisnan (buf, 0, strlen (buf)))

      result |= 2;

    if (sprintf (buf, "%Lg", x.value) < 0

        || !strisnan (buf, 0, strlen (buf)))

      result |= 2;

  }

  {

    /* Signalling NaN.  */

    static union { unsigned int word[4]; long double value; } x =

      { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };

    if (sprintf (buf, "%Lf", x.value) < 0

        || !strisnan (buf, 0, strlen (buf)))

      result |= 2;

    if (sprintf (buf, "%Le", x.value) < 0

        || !strisnan (buf, 0, strlen (buf)))

      result |= 2;

    if (sprintf (buf, "%Lg", x.value) < 0

        || !strisnan (buf, 0, strlen (buf)))

      result |= 2;

  }

  { /* Pseudo-NaN.  */

    static union { unsigned int word[4]; long double value; } x =

      { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };

    if (sprintf (buf, "%Lf", x.value) <= 0)

      result |= 4;

    if (sprintf (buf, "%Le", x.value) <= 0)

      result |= 4;

    if (sprintf (buf, "%Lg", x.value) <= 0)

      result |= 4;

  }

  { /* Pseudo-Infinity.  */

    static union { unsigned int word[4]; long double value; } x =

      { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };

    if (sprintf (buf, "%Lf", x.value) <= 0)

      result |= 8;

    if (sprintf (buf, "%Le", x.value) <= 0)

      result |= 8;

    if (sprintf (buf, "%Lg", x.value) <= 0)

      result |= 8;

  }

  { /* Pseudo-Zero.  */

    static union { unsigned int word[4]; long double value; } x =

      { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };

    if (sprintf (buf, "%Lf", x.value) <= 0)

      result |= 16;

    if (sprintf (buf, "%Le", x.value) <= 0)

      result |= 16;

    if (sprintf (buf, "%Lg", x.value) <= 0)

      result |= 16;

  }

  { /* Unnormalized number.  */

    static union { unsigned int word[4]; long double value; } x =

      { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };

    if (sprintf (buf, "%Lf", x.value) <= 0)

      result |= 32;

    if (sprintf (buf, "%Le", x.value) <= 0)

      result |= 32;

    if (sprintf (buf, "%Lg", x.value) <= 0)

      result |= 32;

  }

  { /* Pseudo-Denormal.  */

    static union { unsigned int word[4]; long double value; } x =

      { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };

    if (sprintf (buf, "%Lf", x.value) <= 0)

      result |= 64;

    if (sprintf (buf, "%Le", x.value) <= 0)

      result |= 64;

    if (sprintf (buf, "%Lg", x.value) <= 0)

      result |= 64;

  }

#endif

  return result;

}]])],

            [gl_cv_func_printf_infinite_long_double=yes],

            [gl_cv_func_printf_infinite_long_double=no],

            [case "$host_cpu" in

                                     # Guess no on ia64, x86_64, i386.

               ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;

               *)

                 case "$host_os" in

changequote(,)dnl

                                         # Guess yes on glibc systems.

                   *-gnu* | gnu*)        gl_cv_func_printf_infinite_long_double="guessing yes";;

                                         # Guess yes on musl systems.

                   *-musl*)              gl_cv_func_printf_infinite_long_double="guessing yes";;

                                         # Guess yes on FreeBSD >= 6.

                   freebsd[1-5].*)       gl_cv_func_printf_infinite_long_double="guessing no";;

                   freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;

                                         # Guess yes on HP-UX >= 11.

                   hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;

                   hpux*)                gl_cv_func_printf_infinite_long_double="guessing yes";;

                                         # Guess no on Android.

                   linux*-android*)      gl_cv_func_printf_infinite_long_double="guessing no";;

changequote([,])dnl

                                         # Guess yes on MSVC, no on mingw.

                   mingw*)               AC_EGREP_CPP([Known], [

#ifdef _MSC_VER

 Known

#endif

                                           ],

                                           [gl_cv_func_printf_infinite_long_double="guessing yes"],

                                           [gl_cv_func_printf_infinite_long_double="guessing no"])

                                         ;;

                                         # If we don't know, assume the worst.

                   *)                    gl_cv_func_printf_infinite_long_double="guessing no";;

                 esac

                 ;;

             esac

            ])

        ])

      ;;

    *)

      gl_cv_func_printf_infinite_long_double="irrelevant"

      ;;

  esac

])

dnl Test whether the *printf family of functions supports the 'a' and 'A'

dnl conversion specifier for hexadecimal output of floating-point numbers.

dnl (ISO C99, POSIX:2001)

dnl Result is gl_cv_func_printf_directive_a.

AC_DEFUN([gl_PRINTF_DIRECTIVE_A],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],

    [gl_cv_func_printf_directive_a],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stdio.h>

#include <string.h>

static char buf[100];

static double zero = 0.0;

int main ()

{

  int result = 0;

  if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0

      || (strcmp (buf, "0x1.922p+1 33") != 0

          && strcmp (buf, "0x3.244p+0 33") != 0

          && strcmp (buf, "0x6.488p-1 33") != 0

          && strcmp (buf, "0xc.91p-2 33") != 0))

    result |= 1;

  if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0

      || (strcmp (buf, "-0X1.922P+1 33") != 0

          && strcmp (buf, "-0X3.244P+0 33") != 0

          && strcmp (buf, "-0X6.488P-1 33") != 0

          && strcmp (buf, "-0XC.91P-2 33") != 0))

    result |= 2;

  /* This catches a FreeBSD 6.1 bug: it doesn't round.  */

  if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0

      || (strcmp (buf, "0x1.83p+0 33") != 0

          && strcmp (buf, "0x3.05p-1 33") != 0

          && strcmp (buf, "0x6.0ap-2 33") != 0

          && strcmp (buf, "0xc.14p-3 33") != 0))

    result |= 4;

  /* This catches a Mac OS X 10.12.4 (Darwin 16.5) bug: it doesn't round.  */

  if (sprintf (buf, "%.0a %d", 1.51, 33, 44, 55) < 0

      || (strcmp (buf, "0x2p+0 33") != 0

          && strcmp (buf, "0x3p-1 33") != 0

          && strcmp (buf, "0x6p-2 33") != 0

          && strcmp (buf, "0xcp-3 33") != 0))

    result |= 4;

  /* This catches a FreeBSD 6.1 bug.  See

     <https://lists.gnu.org/r/bug-gnulib/2007-04/msg00107.html> */

  if (sprintf (buf, "%010a %d", 1.0 / zero, 33, 44, 55) < 0

      || buf[0] == '0')

    result |= 8;

  /* This catches a Mac OS X 10.3.9 (Darwin 7.9) bug.  */

  if (sprintf (buf, "%.1a", 1.999) < 0

      || (strcmp (buf, "0x1.0p+1") != 0

          && strcmp (buf, "0x2.0p+0") != 0

          && strcmp (buf, "0x4.0p-1") != 0

          && strcmp (buf, "0x8.0p-2") != 0))

    result |= 16;

  /* This catches the same Mac OS X 10.3.9 (Darwin 7.9) bug and also a

     glibc 2.4 bug <https://sourceware.org/bugzilla/show_bug.cgi?id=2908>.  */

  if (sprintf (buf, "%.1La", 1.999L) < 0

      || (strcmp (buf, "0x1.0p+1") != 0

          && strcmp (buf, "0x2.0p+0") != 0

          && strcmp (buf, "0x4.0p-1") != 0

          && strcmp (buf, "0x8.0p-2") != 0))

    result |= 32;

  return result;

}]])],

        [gl_cv_func_printf_directive_a=yes],

        [gl_cv_func_printf_directive_a=no],

        [

         case "$host_os" in

                                 # Guess yes on glibc >= 2.5 systems.

           *-gnu* | gnu*)

             AC_EGREP_CPP([BZ2908], [

               #include <features.h>

               #ifdef __GNU_LIBRARY__

                #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)) && !defined __UCLIBC__

                 BZ2908

                #endif

               #endif

               ],

               [gl_cv_func_printf_directive_a="guessing yes"],

               [gl_cv_func_printf_directive_a="guessing no"])

             ;;

                                 # Guess yes on musl systems.

           *-musl*)              gl_cv_func_printf_directive_a="guessing yes";;

                                 # Guess no on Android.

           linux*-android*)      gl_cv_func_printf_directive_a="guessing no";;

                                 # Guess no on native Windows.

           mingw*)               gl_cv_func_printf_directive_a="guessing no";;

                                 # If we don't know, assume the worst.

           *)                    gl_cv_func_printf_directive_a="guessing no";;

         esac

        ])

    ])

])

dnl Test whether the *printf family of functions supports the %F format

dnl directive. (ISO C99, POSIX:2001)

dnl Result is gl_cv_func_printf_directive_f.

AC_DEFUN([gl_PRINTF_DIRECTIVE_F],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports the 'F' directive],

    [gl_cv_func_printf_directive_f],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stdio.h>

#include <string.h>

static char buf[100];

static double zero = 0.0;

int main ()

{

  int result = 0;

  if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0

      || strcmp (buf, "1234567.000000 33") != 0)

    result |= 1;

  if (sprintf (buf, "%F", 1.0 / zero) < 0

      || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))

    result |= 2;

  /* This catches a Cygwin 1.5.x bug.  */

  if (sprintf (buf, "%.F", 1234.0) < 0

      || strcmp (buf, "1234") != 0)

    result |= 4;

  return result;

}]])],

        [gl_cv_func_printf_directive_f=yes],

        [gl_cv_func_printf_directive_f=no],

        [

         case "$host_os" in

changequote(,)dnl

                                 # Guess yes on glibc systems.

           *-gnu* | gnu*)        gl_cv_func_printf_directive_f="guessing yes";;

                                 # Guess yes on musl systems.

           *-musl*)              gl_cv_func_printf_directive_f="guessing yes";;

                                 # Guess yes on FreeBSD >= 6.

           freebsd[1-5].*)       gl_cv_func_printf_directive_f="guessing no";;

           freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;

                                 # Guess yes on Mac OS X >= 10.3.

           darwin[1-6].*)        gl_cv_func_printf_directive_f="guessing no";;

           darwin*)              gl_cv_func_printf_directive_f="guessing yes";;

                                 # Guess yes on Solaris >= 2.10.

           solaris2.[1-9][0-9]*) gl_cv_func_printf_directive_f="guessing yes";;

           solaris*)             gl_cv_func_printf_directive_f="guessing no";;

                                 # Guess no on Android.

           linux*-android*)      gl_cv_func_printf_directive_f="guessing no";;

changequote([,])dnl

                                 # Guess yes on MSVC, no on mingw.

           mingw*)               AC_EGREP_CPP([Known], [

#ifdef _MSC_VER

 Known

#endif

                                   ],

                                   [gl_cv_func_printf_directive_f="guessing yes"],

                                   [gl_cv_func_printf_directive_f="guessing no"])

                                 ;;

                                 # If we don't know, assume the worst.

           *)                    gl_cv_func_printf_directive_f="guessing no";;

         esac

        ])

    ])

])

dnl Test whether the *printf family of functions supports the %n format

dnl directive. (ISO C99, POSIX:2001)

dnl Result is gl_cv_func_printf_directive_n.

AC_DEFUN([gl_PRINTF_DIRECTIVE_N],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports the 'n' directive],

    [gl_cv_func_printf_directive_n],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#ifdef _MSC_VER

/* See page about "Parameter Validation" on msdn.microsoft.com.  */

static void cdecl

invalid_parameter_handler (const wchar_t *expression,

                           const wchar_t *function,

                           const wchar_t *file, unsigned int line,

                           uintptr_t dummy)

{

  exit (1);

}

#endif

static char fmtstring[10];

static char buf[100];

int main ()

{

  int count = -1;

#ifdef _MSC_VER

  _set_invalid_parameter_handler (invalid_parameter_handler);

#endif

  /* Copy the format string.  Some systems (glibc with _FORTIFY_SOURCE=2)

     support %n in format strings in read-only memory but not in writable

     memory.  */

  strcpy (fmtstring, "%d %n");

  if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0

      || strcmp (buf, "123 ") != 0

      || count != 4)

    return 1;

  return 0;

}]])],

        [gl_cv_func_printf_directive_n=yes],

        [gl_cv_func_printf_directive_n=no],

        [case "$host_os" in

                            # Guess no on Android.

           linux*-android*) gl_cv_func_printf_directive_n="guessing no";;

                            # Guess no on native Windows.

           mingw*)          gl_cv_func_printf_directive_n="guessing no";;

           *)               gl_cv_func_printf_directive_n="guessing yes";;

         esac

        ])

    ])

])

dnl Test whether the *printf family of functions supports the %ls format

dnl directive and in particular, when a precision is specified, whether

dnl the functions stop converting the wide string argument when the number

dnl of bytes that have been produced by this conversion equals or exceeds

dnl the precision.

dnl Result is gl_cv_func_printf_directive_ls.

AC_DEFUN([gl_PRINTF_DIRECTIVE_LS],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports the 'ls' directive],

    [gl_cv_func_printf_directive_ls],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before

   <wchar.h>.

   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be

   included before <wchar.h>.  */

#include <stddef.h>

#include <stdio.h>

#include <time.h>

#include <wchar.h>

#include <string.h>

int main ()

{

  int result = 0;

  char buf[100];

  /* Test whether %ls works at all.

     This test fails on OpenBSD 4.0, IRIX 6.5, Solaris 2.6, Haiku, but not on

     Cygwin 1.5.  */

  {

    static const wchar_t wstring[] = { 'a', 'b', 'c', 0 };

    buf[0] = '\0';

    if (sprintf (buf, "%ls", wstring) < 0

        || strcmp (buf, "abc") != 0)

      result |= 1;

  }

  /* This test fails on IRIX 6.5, Solaris 2.6, Cygwin 1.5, Haiku (with an

     assertion failure inside libc), but not on OpenBSD 4.0.  */

  {

    static const wchar_t wstring[] = { 'a', 0 };

    buf[0] = '\0';

    if (sprintf (buf, "%ls", wstring) < 0

        || strcmp (buf, "a") != 0)

      result |= 2;

  }

  /* Test whether precisions in %ls are supported as specified in ISO C 99

     section 7.19.6.1:

       "If a precision is specified, no more than that many bytes are written

        (including shift sequences, if any), and the array shall contain a

        null wide character if, to equal the multibyte character sequence

        length given by the precision, the function would need to access a

        wide character one past the end of the array."

     This test fails on Solaris 10.  */

  {

    static const wchar_t wstring[] = { 'a', 'b', (wchar_t) 0xfdfdfdfd, 0 };

    buf[0] = '\0';

    if (sprintf (buf, "%.2ls", wstring) < 0

        || strcmp (buf, "ab") != 0)

      result |= 8;

  }

  return result;

}]])],

        [gl_cv_func_printf_directive_ls=yes],

        [gl_cv_func_printf_directive_ls=no],

        [

changequote(,)dnl

         case "$host_os" in

           openbsd*)        gl_cv_func_printf_directive_ls="guessing no";;

           irix*)           gl_cv_func_printf_directive_ls="guessing no";;

           solaris*)        gl_cv_func_printf_directive_ls="guessing no";;

           cygwin*)         gl_cv_func_printf_directive_ls="guessing no";;

           beos* | haiku*)  gl_cv_func_printf_directive_ls="guessing no";;

                            # Guess no on Android.

           linux*-android*) gl_cv_func_printf_directive_ls="guessing no";;

                            # Guess yes on native Windows.

           mingw*)          gl_cv_func_printf_directive_ls="guessing yes";;

           *)               gl_cv_func_printf_directive_ls="guessing yes";;

         esac

changequote([,])dnl

        ])

    ])

])

dnl Test whether the *printf family of functions supports POSIX/XSI format

dnl strings with positions. (POSIX:2001)

dnl Result is gl_cv_func_printf_positions.

AC_DEFUN([gl_PRINTF_POSITIONS],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],

    [gl_cv_func_printf_positions],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stdio.h>

#include <string.h>

/* The string "%2$d %1$d", with dollar characters protected from the shell's

   dollar expansion (possibly an autoconf bug).  */

static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };

static char buf[100];

int main ()

{

  sprintf (buf, format, 33, 55);

  return (strcmp (buf, "55 33") != 0);

}]])],

        [gl_cv_func_printf_positions=yes],

        [gl_cv_func_printf_positions=no],

        [

changequote(,)dnl

         case "$host_os" in

           netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)

                            gl_cv_func_printf_positions="guessing no";;

           beos*)           gl_cv_func_printf_positions="guessing no";;

                            # Guess yes on Android.

           linux*-android*) gl_cv_func_printf_positions="guessing yes";;

                            # Guess no on native Windows.

           mingw* | pw*)    gl_cv_func_printf_positions="guessing no";;

           *)               gl_cv_func_printf_positions="guessing yes";;

         esac

changequote([,])dnl

        ])

    ])

])

dnl Test whether the *printf family of functions supports POSIX/XSI format

dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001)

dnl Result is gl_cv_func_printf_flag_grouping.

AC_DEFUN([gl_PRINTF_FLAG_GROUPING],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CACHE_CHECK([whether printf supports the grouping flag],

    [gl_cv_func_printf_flag_grouping],

    [

      AC_RUN_IFELSE(

        [AC_LANG_SOURCE([[

#include <stdio.h>

#include <string.h>

static char buf[100];

int main ()

{

  if (sprintf (buf, "%'d %d", 1234567, 99) < 0

      || buf[strlen (buf) - 1] != '9')

    return 1;

  return 0;

}]])],

        [gl_cv_func_printf_flag_grouping=yes],

        [gl_cv_func_printf_flag_grouping=no],

        [

changequote(,)dnl

         case "$host_os" in