third_party/gmp/printf/doprnt.c - RealtimeRoboticsGroup/test - Gitiles

 /* __gmp_doprnt -- printf style formatted output.

    THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY.  THEY'RE ALMOST
    CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
    FUTURE GNU MP RELEASES.

 Copyright 2001-2003 Free Software Foundation, Inc.

 This file is part of the GNU MP Library.

 The GNU MP Library is free software; you can redistribute it and/or modify
 it under the terms of either:

   * 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.

 or

   * the GNU General Public License as published by the Free Software
     Foundation; either version 2 of the License, or (at your option) any
     later version.

 or both in parallel, as here.

 The GNU MP 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 General Public License
 for more details.

 You should have received copies of the GNU General Public License and the
 GNU Lesser General Public License along with the GNU MP Library.  If not,
 see https://www.gnu.org/licenses/.  */

 #define _GNU_SOURCE    /* for DECIMAL_POINT in glibc langinfo.h */

 #include "config.h"	/* needed for the HAVE_, could also move gmp incls */

 #include <stdarg.h>
 #include <ctype.h>     /* for isdigit */
 #include <stddef.h>    /* for ptrdiff_t */
 #include <string.h>
 #include <stdio.h>     /* for NULL */
 #include <stdlib.h>

 #if HAVE_INTTYPES_H
 # include <inttypes.h> /* for intmax_t */
 #else
 # if HAVE_STDINT_H
 #  include <stdint.h>
 # endif
 #endif

 #if HAVE_LANGINFO_H
 #include <langinfo.h>  /* for nl_langinfo */
 #endif

 #if HAVE_LOCALE_H
 #include <locale.h>    /* for localeconv */
 #endif

 #if HAVE_SYS_TYPES_H
 #include <sys/types.h> /* for quad_t */
 #endif

 #include "gmp-impl.h"


 /* change this to "#define TRACE(x) x" for diagnostics */
 #define TRACE(x)


 /* Should be portable, but in any case this is only used under some ASSERTs. */
 #define va_equal(x, y)                           \
   (memcmp (&(x), &(y), sizeof(va_list)) == 0)


 /* printf is convenient because it allows various types to be printed in one
    fairly compact call, so having gmp_printf support the standard types as
    well as the gmp ones is important.  This ends up meaning all the standard
    parsing must be duplicated, to get a new routine recognising the gmp
    extras.

    With the currently favoured handling of mpz etc as Z, Q and F type
    markers, it's not possible to use glibc register_printf_function since
    that only accepts new conversion characters, not new types.  If Z was a
    conversion there'd be no way to specify hex, decimal or octal, or
    similarly with F no way to specify fixed point or scientific format.

    It seems wisest to pass conversions %f, %e and %g of float, double and
    long double over to the standard printf.  It'd be hard to be sure of
    getting the right handling for NaNs, rounding, etc.  Integer conversions
    %d etc and string conversions %s on the other hand could be easily enough
    handled within gmp_doprnt, but if floats are going to libc then it's just
    as easy to send all non-gmp types there.

    "Z" was a type marker for size_t in old glibc, but there seems no need to
    provide access to that now "z" is standard.

    In GMP 4.1.1 we documented "ll" and "L" as being equivalent, but in C99
    in fact "ll" is just for long long and "L" just for long double.
    Apparently GLIBC allows "L" for long long though.  This doesn't affect
    us as such, since both are passed through to the C library.  To be
    consistent with what we said before, the two are treated equivalently
    here, and it's left to the C library to do what it thinks with them.

    Possibilities:

    "b" might be nice for binary output, and could even be supported for the
    standard C types too if desired.

    POSIX style "%n$" parameter numbering would be possible, but would need
    to be handled completely within gmp_doprnt, since the numbering will be
    all different once the format string it cut into pieces.

    Some options for mpq formatting would be good.  Perhaps a non-zero
    precision field could give a width for the denominator and mean always
    put a "/".  A form "n+p/q" might interesting too, though perhaps that's
    better left to applications.

    Right now there's no way for an application to know whether types like
    intmax_t are supported here.  If configure is doing its job and the same
    compiler is used for gmp as for the application then there shouldn't be
    any problem, but perhaps gmp.h should have some preprocessor symbols to
    say what libgmp can do.  */


 /* If a gmp format is the very first thing or there are two gmp formats with
    nothing in between then we'll reach here with this_fmt == last_fmt and we
    can do nothing in that case.

    last_ap is always replaced after a FLUSH, so it doesn't matter if va_list
    is a call-by-reference and the funs->format routine modifies it.  */

 #define FLUSH()                                         \
   do {                                                  \
     if (this_fmt == last_fmt)                           \
       {                                                 \
 	TRACE (printf ("nothing to flush\n"));          \
 	ASSERT (va_equal (this_ap, last_ap));           \
       }                                                 \
     else                                                \
       {                                                 \
 	ASSERT (*this_fmt == '%');                      \
 	*this_fmt = '\0';                               \
 	TRACE (printf ("flush \"%s\"\n", last_fmt));    \
 	DOPRNT_FORMAT (last_fmt, last_ap);              \
       }                                                 \
   } while (0)


 /* Parse up the given format string and do the appropriate output using the
    given "funs" routines.  The data parameter is passed through to those
    routines.  */

 int
 __gmp_doprnt (const struct doprnt_funs_t *funs, void *data,
 	      const char *orig_fmt, va_list orig_ap)
 {
   va_list  ap, this_ap, last_ap;
   size_t   alloc_fmt_size, orig_fmt_size;
   char     *fmt, *alloc_fmt, *last_fmt, *this_fmt, *gmp_str;
   int      retval = 0;
   int      type, fchar, *value, seen_precision;
   struct doprnt_params_t param;

   TRACE (printf ("gmp_doprnt \"%s\"\n", orig_fmt));

   /* Don't modify orig_ap, if va_list is actually an array and hence call by
      reference.  It could be argued that it'd be more efficient to leave the
      caller to make a copy if it cared, but doing so here is going to be a
      very small part of the total work, and we may as well keep applications
      out of trouble.  */
   va_copy (ap, orig_ap);

   /* The format string is chopped up into pieces to be passed to
      funs->format.  Unfortunately that means it has to be copied so each
      piece can be null-terminated.  We're not going to be very fast here, so
      use __gmp_allocate_func rather than TMP_ALLOC, to avoid overflowing the
      stack if a long output string is given.  */
   alloc_fmt_size = orig_fmt_size = strlen (orig_fmt) + 1;
 #if _LONG_LONG_LIMB
   /* for a long long limb we change %Mx to %llx, so could need an extra 1
      char for every 3 existing */
   alloc_fmt_size += alloc_fmt_size / 3;
 #endif
   alloc_fmt = __GMP_ALLOCATE_FUNC_TYPE (alloc_fmt_size, char);
   fmt = alloc_fmt;
   memcpy (fmt, orig_fmt, orig_fmt_size);

   /* last_fmt and last_ap are just after the last output, and hence where
      the next output will begin, when that's done */
   last_fmt = fmt;
   va_copy (last_ap, ap);

   for (;;)
     {
       TRACE (printf ("next: \"%s\"\n", fmt));

       fmt = strchr (fmt, '%');
       if (fmt == NULL)
 	break;

       /* this_fmt and this_ap are the current '%' sequence being considered */
       this_fmt = fmt;
       va_copy (this_ap, ap);
       fmt++; /* skip the '%' */

       TRACE (printf ("considering\n");
 	     printf ("  last: \"%s\"\n", last_fmt);
 	     printf ("  this: \"%s\"\n", this_fmt));

       type = '\0';
       value = &param.width;

       param.base = 10;
       param.conv = 0;
       param.expfmt = "e%c%02ld";
       param.exptimes4 = 0;
       param.fill = ' ';
       param.justify = DOPRNT_JUSTIFY_RIGHT;
       param.prec = 6;
       param.showbase = DOPRNT_SHOWBASE_NO;
       param.showpoint = 0;
       param.showtrailing = 1;
       param.sign = '\0';
       param.width = 0;
       seen_precision = 0;

       /* This loop parses a single % sequence.  "break" from the switch
 	 means continue with this %, "goto next" means the conversion
 	 character has been seen and a new % should be sought.  */
       for (;;)
 	{
 	  fchar = *fmt++;
 	  if (fchar == '\0')
 	    break;

 	  switch (fchar) {

 	  case 'a':
 	    /* %a behaves like %e, but defaults to all significant digits,
 	       and there's no leading zeros on the exponent (which is in
 	       fact bit-based) */
 	    param.base = 16;
 	    param.expfmt = "p%c%ld";
 	    goto conv_a;
 	  case 'A':
 	    param.base = -16;
 	    param.expfmt = "P%c%ld";
 	  conv_a:
 	    param.conv = DOPRNT_CONV_SCIENTIFIC;
 	    param.exptimes4 = 1;
 	    if (! seen_precision)
 	      param.prec = -1;  /* default to all digits */
 	    param.showbase = DOPRNT_SHOWBASE_YES;
 	    param.showtrailing = 1;
 	    goto floating_a;

 	  case 'c':
 	    /* Let's assume wchar_t will be promoted to "int" in the call,
 	       the same as char will be. */
 	    (void) va_arg (ap, int);
 	    goto next;

 	  case 'd':
 	  case 'i':
 	  case 'u':
 	  integer:
 	    TRACE (printf ("integer, base=%d\n", param.base));
 	    if (! seen_precision)
 	      param.prec = -1;
 	    switch (type) {
 	    case 'j':
 	      /* Let's assume uintmax_t is the same size as intmax_t. */
 #if HAVE_INTMAX_T
 	      (void) va_arg (ap, intmax_t);
 #else
 	      ASSERT_FAIL (intmax_t not available);
 #endif
 	      break;
 	    case 'l':
 	      (void) va_arg (ap, long);
 	      break;
 	    case 'L':
 #if HAVE_LONG_LONG
 	      (void) va_arg (ap, long long);
 #else
 	      ASSERT_FAIL (long long not available);
 #endif
 	      break;
 	    case 'N':
 	      {
 		mp_ptr     xp;
 		mp_size_t  xsize, abs_xsize;
 		mpz_t      z;
 		FLUSH ();
 		xp = va_arg (ap, mp_ptr);
 		PTR(z) = xp;
 		xsize = (int) va_arg (ap, mp_size_t);
 		abs_xsize = ABS (xsize);
 		MPN_NORMALIZE (xp, abs_xsize);
 		SIZ(z) = (xsize >= 0 ? abs_xsize : -abs_xsize);
 		ASSERT_CODE (ALLOC(z) = abs_xsize);
 		gmp_str = mpz_get_str (NULL, param.base, z);
 		goto gmp_integer;
 	      }
 	      /* break; */
 	    case 'q':
 	      /* quad_t is probably the same as long long, but let's treat
 		 it separately just to be sure.  Also let's assume u_quad_t
 		 will be the same size as quad_t.  */
 #if HAVE_QUAD_T
 	      (void) va_arg (ap, quad_t);
 #else
 	      ASSERT_FAIL (quad_t not available);
 #endif
 	      break;
 	    case 'Q':
 	      FLUSH ();
 	      gmp_str = mpq_get_str (NULL, param.base, va_arg(ap, mpq_srcptr));
 	      goto gmp_integer;
 	    case 't':
 #if HAVE_PTRDIFF_T
 	      (void) va_arg (ap, ptrdiff_t);
 #else
 	      ASSERT_FAIL (ptrdiff_t not available);
 #endif
 	      break;
 	    case 'z':
 	      (void) va_arg (ap, size_t);
 	      break;
 	    case 'Z':
 	      {
 		int   ret;
 		FLUSH ();
 		gmp_str = mpz_get_str (NULL, param.base,
 				       va_arg (ap, mpz_srcptr));
 	      gmp_integer:
 		ret = __gmp_doprnt_integer (funs, data, &param, gmp_str);
 		 __GMP_FREE_FUNC_TYPE (gmp_str, strlen(gmp_str)+1, char);
 		DOPRNT_ACCUMULATE (ret);
 		va_copy (last_ap, ap);
 		last_fmt = fmt;
 	      }
 	      break;
 	    default:
 	      /* default is an "int", and this includes h=short and hh=char
 		 since they're promoted to int in a function call */
 	      (void) va_arg (ap, int);
 	      break;
 	    }
 	    goto next;

 	  case 'E':
 	    param.base = -10;
 	    param.expfmt = "E%c%02ld";
 	    /*FALLTHRU*/
 	  case 'e':
 	    param.conv = DOPRNT_CONV_SCIENTIFIC;
 	  floating:
 	    if (param.showbase == DOPRNT_SHOWBASE_NONZERO)
 	      {
 		/* # in %e, %f and %g */
 		param.showpoint = 1;
 		param.showtrailing = 1;
 	      }
 	  floating_a:
 	    switch (type) {
 	    case 'F':
 	      FLUSH ();
 	      DOPRNT_ACCUMULATE (__gmp_doprnt_mpf (funs, data, &param,
 						   GMP_DECIMAL_POINT,
 						   va_arg (ap, mpf_srcptr)));
 	      va_copy (last_ap, ap);
 	      last_fmt = fmt;
 	      break;
 	    case 'L':
 #if HAVE_LONG_DOUBLE
 	      (void) va_arg (ap, long double);
 #else
 	      ASSERT_FAIL (long double not available);
 #endif
 	      break;
 	    default:
 	      (void) va_arg (ap, double);
 	      break;
 	    }
 	    goto next;

 	  case 'f':
 	    param.conv = DOPRNT_CONV_FIXED;
 	    goto floating;

 	  case 'F': /* mpf_t     */
 	  case 'j': /* intmax_t  */
 	  case 'L': /* long long */
 	  case 'N': /* mpn       */
 	  case 'q': /* quad_t    */
 	  case 'Q': /* mpq_t     */
 	  case 't': /* ptrdiff_t */
 	  case 'z': /* size_t    */
 	  case 'Z': /* mpz_t     */
 	  set_type:
 	    type = fchar;
 	    break;

 	  case 'G':
 	    param.base = -10;
 	    param.expfmt = "E%c%02ld";
 	    /*FALLTHRU*/
 	  case 'g':
 	    param.conv = DOPRNT_CONV_GENERAL;
 	    param.showtrailing = 0;
 	    goto floating;

 	  case 'h':
 	    if (type != 'h')
 	      goto set_type;
 	    type = 'H';   /* internal code for "hh" */
 	    break;

 	  case 'l':
 	    if (type != 'l')
 	      goto set_type;
 	    type = 'L';   /* "ll" means "L" */
 	    break;

 	  case 'm':
 	    /* glibc strerror(errno), no argument */
 	    goto next;

 	  case 'M': /* mp_limb_t */
 	    /* mung format string to l or ll and let plain printf handle it */
 #if _LONG_LONG_LIMB
 	    memmove (fmt+1, fmt, strlen (fmt)+1);
 	    fmt[-1] = 'l';
 	    fmt[0] = 'l';
 	    fmt++;
 	    type = 'L';
 #else
 	    fmt[-1] = 'l';
 	    type = 'l';
 #endif
 	    break;

 	  case 'n':
 	    {
 	      void  *p;
 	      FLUSH ();
 	      p = va_arg (ap, void *);
 	      switch (type) {
 	      case '\0': * (int       *) p = retval; break;
 	      case 'F':  mpf_set_si ((mpf_ptr) p, (long) retval); break;
 	      case 'H':  * (char      *) p = retval; break;
 	      case 'h':  * (short     *) p = retval; break;
 #if HAVE_INTMAX_T
 	      case 'j':  * (intmax_t  *) p = retval; break;
 #else
 	      case 'j':  ASSERT_FAIL (intmax_t not available); break;
 #endif
 	      case 'l':  * (long      *) p = retval; break;
 #if HAVE_QUAD_T && HAVE_LONG_LONG
 	      case 'q':
 		ASSERT_ALWAYS (sizeof (quad_t) == sizeof (long long));
 		/*FALLTHRU*/
 #else
 	      case 'q':  ASSERT_FAIL (quad_t not available); break;
 #endif
 #if HAVE_LONG_LONG
 	      case 'L':  * (long long *) p = retval; break;
 #else
 	      case 'L':  ASSERT_FAIL (long long not available); break;
 #endif
 	      case 'N':
 		{
 		  mp_size_t  n;
 		  n = va_arg (ap, mp_size_t);
 		  n = ABS (n);
 		  if (n != 0)
 		    {
 		      * (mp_ptr) p = retval;
 		      MPN_ZERO ((mp_ptr) p + 1, n - 1);
 		    }
 		}
 		break;
 	      case 'Q':  mpq_set_si ((mpq_ptr) p, (long) retval, 1L); break;
 #if HAVE_PTRDIFF_T
 	      case 't':  * (ptrdiff_t *) p = retval; break;
 #else
 	      case 't':  ASSERT_FAIL (ptrdiff_t not available); break;
 #endif
 	      case 'z':  * (size_t    *) p = retval; break;
 	      case 'Z':  mpz_set_si ((mpz_ptr) p, (long) retval); break;
 	      }
 	    }
 	    va_copy (last_ap, ap);
 	    last_fmt = fmt;
 	    goto next;

 	  case 'o':
 	    param.base = 8;
 	    goto integer;

 	  case 'p':
 	  case 's':
 	    /* "void *" will be good enough for "char *" or "wchar_t *", no
 	       need for separate code.  */
 	    (void) va_arg (ap, const void *);
 	    goto next;

 	  case 'x':
 	    param.base = 16;
 	    goto integer;
 	  case 'X':
 	    param.base = -16;
 	    goto integer;

 	  case '%':
 	    goto next;

 	  case '#':
 	    param.showbase = DOPRNT_SHOWBASE_NONZERO;
 	    break;

 	  case '\'':
 	    /* glibc digit grouping, just pass it through, no support for it
 	       on gmp types */
 	    break;

 	  case '+':
 	  case ' ':
 	    param.sign = fchar;
 	    break;

 	  case '-':
 	    param.justify = DOPRNT_JUSTIFY_LEFT;
 	    break;
 	  case '.':
 	    seen_precision = 1;
 	    param.prec = -1; /* "." alone means all necessary digits */
 	    value = &param.prec;
 	    break;

 	  case '*':
 	    {
 	      int n = va_arg (ap, int);

 	      if (value == &param.width)
 		{
 		  /* negative width means left justify */
 		  if (n < 0)
 		    {
 		      param.justify = DOPRNT_JUSTIFY_LEFT;
 		      n = -n;
 		    }
 		  param.width = n;
 		}
 	      else
 		{
 		  /* don't allow negative precision */
 		  param.prec = MAX (0, n);
 		}
 	    }
 	    break;

 	  case '0':
 	    if (value == &param.width)
 	      {
 		/* in width field, set fill */
 		param.fill = '0';

 		/* for right justify, put the fill after any minus sign */
 		if (param.justify == DOPRNT_JUSTIFY_RIGHT)
 		  param.justify = DOPRNT_JUSTIFY_INTERNAL;
 	      }
 	    else
 	      {
 		/* in precision field, set value */
 		*value = 0;
 	      }
 	    break;

 	  case '1': case '2': case '3': case '4': case '5':
 	  case '6': case '7': case '8': case '9':
 	    /* process all digits to form a value */
 	    {
 	      int  n = 0;
 	      do {
 		n = n * 10 + (fchar-'0');
 		fchar = *fmt++;
 	      } while (isascii (fchar) && isdigit (fchar));
 	      fmt--; /* unget the non-digit */
 	      *value = n;
 	    }
 	    break;

 	  default:
 	    /* something invalid */
 	    ASSERT (0);
 	    goto next;
 	  }
 	}

     next:
       /* Stop parsing the current "%" format, look for a new one. */
       ;
     }

   TRACE (printf ("remainder: \"%s\"\n", last_fmt));
   if (*last_fmt != '\0')
     DOPRNT_FORMAT (last_fmt, last_ap);

   if (funs->final != NULL)
     if ((*funs->final) (data) == -1)
       goto error;

  done:
   __GMP_FREE_FUNC_TYPE (alloc_fmt, alloc_fmt_size, char);
   return retval;

  error:
   retval = -1;
   goto done;
 }
	/* __gmp_doprnt -- printf style formatted output.

	THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST
	CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
	FUTURE GNU MP RELEASES.

	Copyright 2001-2003 Free Software Foundation, Inc.

	This file is part of the GNU MP Library.

	The GNU MP Library is free software; you can redistribute it and/or modify
	it under the terms of either:

	* 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.

	or

	* the GNU General Public License as published by the Free Software
	Foundation; either version 2 of the License, or (at your option) any
	later version.

	or both in parallel, as here.

	The GNU MP 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 General Public License
	for more details.

	You should have received copies of the GNU General Public License and the
	GNU Lesser General Public License along with the GNU MP Library. If not,
	see https://www.gnu.org/licenses/. */

	#define _GNU_SOURCE /* for DECIMAL_POINT in glibc langinfo.h */

	#include "config.h" /* needed for the HAVE_, could also move gmp incls */

	#include <stdarg.h>
	#include <ctype.h> /* for isdigit */
	#include <stddef.h> /* for ptrdiff_t */
	#include <string.h>
	#include <stdio.h> /* for NULL */
	#include <stdlib.h>

	#if HAVE_INTTYPES_H
	# include <inttypes.h> /* for intmax_t */
	#else
	# if HAVE_STDINT_H
	# include <stdint.h>
	# endif
	#endif

	#if HAVE_LANGINFO_H
	#include <langinfo.h> /* for nl_langinfo */
	#endif

	#if HAVE_LOCALE_H
	#include <locale.h> /* for localeconv */
	#endif

	#if HAVE_SYS_TYPES_H
	#include <sys/types.h> /* for quad_t */
	#endif

	#include "gmp-impl.h"


	/* change this to "#define TRACE(x) x" for diagnostics */
	#define TRACE(x)


	/* Should be portable, but in any case this is only used under some ASSERTs. */
	#define va_equal(x, y) \
	(memcmp (&(x), &(y), sizeof(va_list)) == 0)


	/* printf is convenient because it allows various types to be printed in one
	fairly compact call, so having gmp_printf support the standard types as
	well as the gmp ones is important. This ends up meaning all the standard
	parsing must be duplicated, to get a new routine recognising the gmp
	extras.

	With the currently favoured handling of mpz etc as Z, Q and F type
	markers, it's not possible to use glibc register_printf_function since
	that only accepts new conversion characters, not new types. If Z was a
	conversion there'd be no way to specify hex, decimal or octal, or
	similarly with F no way to specify fixed point or scientific format.

	It seems wisest to pass conversions %f, %e and %g of float, double and
	long double over to the standard printf. It'd be hard to be sure of
	getting the right handling for NaNs, rounding, etc. Integer conversions
	%d etc and string conversions %s on the other hand could be easily enough
	handled within gmp_doprnt, but if floats are going to libc then it's just
	as easy to send all non-gmp types there.

	"Z" was a type marker for size_t in old glibc, but there seems no need to
	provide access to that now "z" is standard.

	In GMP 4.1.1 we documented "ll" and "L" as being equivalent, but in C99
	in fact "ll" is just for long long and "L" just for long double.
	Apparently GLIBC allows "L" for long long though. This doesn't affect
	us as such, since both are passed through to the C library. To be
	consistent with what we said before, the two are treated equivalently
	here, and it's left to the C library to do what it thinks with them.

	Possibilities:

	"b" might be nice for binary output, and could even be supported for the
	standard C types too if desired.

	POSIX style "%n$" parameter numbering would be possible, but would need
	to be handled completely within gmp_doprnt, since the numbering will be
	all different once the format string it cut into pieces.

	Some options for mpq formatting would be good. Perhaps a non-zero
	precision field could give a width for the denominator and mean always
	put a "/". A form "n+p/q" might interesting too, though perhaps that's
	better left to applications.

	Right now there's no way for an application to know whether types like
	intmax_t are supported here. If configure is doing its job and the same
	compiler is used for gmp as for the application then there shouldn't be
	any problem, but perhaps gmp.h should have some preprocessor symbols to
	say what libgmp can do. */



	/* If a gmp format is the very first thing or there are two gmp formats with
	nothing in between then we'll reach here with this_fmt == last_fmt and we
	can do nothing in that case.

	last_ap is always replaced after a FLUSH, so it doesn't matter if va_list
	is a call-by-reference and the funs->format routine modifies it. */

	#define FLUSH() \
	do { \
	if (this_fmt == last_fmt) \
	{ \
	TRACE (printf ("nothing to flush\n")); \
	ASSERT (va_equal (this_ap, last_ap)); \
	} \
	else \
	{ \
	ASSERT (*this_fmt == '%'); \
	*this_fmt = '\0'; \
	TRACE (printf ("flush \"%s\"\n", last_fmt)); \
	DOPRNT_FORMAT (last_fmt, last_ap); \
	} \
	} while (0)


	/* Parse up the given format string and do the appropriate output using the
	given "funs" routines. The data parameter is passed through to those
	routines. */

	int
	__gmp_doprnt (const struct doprnt_funs_t funs, void data,
	const char *orig_fmt, va_list orig_ap)
	{
	va_list ap, this_ap, last_ap;
	size_t alloc_fmt_size, orig_fmt_size;
	char fmt, alloc_fmt, last_fmt, this_fmt, *gmp_str;
	int retval = 0;
	int type, fchar, *value, seen_precision;
	struct doprnt_params_t param;

	TRACE (printf ("gmp_doprnt \"%s\"\n", orig_fmt));

	/* Don't modify orig_ap, if va_list is actually an array and hence call by
	reference. It could be argued that it'd be more efficient to leave the
	caller to make a copy if it cared, but doing so here is going to be a
	very small part of the total work, and we may as well keep applications
	out of trouble. */
	va_copy (ap, orig_ap);

	/* The format string is chopped up into pieces to be passed to
	funs->format. Unfortunately that means it has to be copied so each
	piece can be null-terminated. We're not going to be very fast here, so
	use __gmp_allocate_func rather than TMP_ALLOC, to avoid overflowing the
	stack if a long output string is given. */
	alloc_fmt_size = orig_fmt_size = strlen (orig_fmt) + 1;
	#if _LONG_LONG_LIMB
	/* for a long long limb we change %Mx to %llx, so could need an extra 1
	char for every 3 existing */
	alloc_fmt_size += alloc_fmt_size / 3;
	#endif
	alloc_fmt = __GMP_ALLOCATE_FUNC_TYPE (alloc_fmt_size, char);
	fmt = alloc_fmt;
	memcpy (fmt, orig_fmt, orig_fmt_size);

	/* last_fmt and last_ap are just after the last output, and hence where
	the next output will begin, when that's done */
	last_fmt = fmt;
	va_copy (last_ap, ap);

	for (;;)
	{
	TRACE (printf ("next: \"%s\"\n", fmt));

	fmt = strchr (fmt, '%');
	if (fmt == NULL)
	break;

	/* this_fmt and this_ap are the current '%' sequence being considered */
	this_fmt = fmt;
	va_copy (this_ap, ap);
	fmt++; /* skip the '%' */

	TRACE (printf ("considering\n");
	printf (" last: \"%s\"\n", last_fmt);
	printf (" this: \"%s\"\n", this_fmt));

	type = '\0';
	value = &param.width;

	param.base = 10;
	param.conv = 0;
	param.expfmt = "e%c%02ld";
	param.exptimes4 = 0;
	param.fill = ' ';
	param.justify = DOPRNT_JUSTIFY_RIGHT;
	param.prec = 6;
	param.showbase = DOPRNT_SHOWBASE_NO;
	param.showpoint = 0;
	param.showtrailing = 1;
	param.sign = '\0';
	param.width = 0;
	seen_precision = 0;

	/* This loop parses a single % sequence. "break" from the switch
	means continue with this %, "goto next" means the conversion
	character has been seen and a new % should be sought. */
	for (;;)
	{
	fchar = *fmt++;
	if (fchar == '\0')
	break;

	switch (fchar) {

	case 'a':
	/* %a behaves like %e, but defaults to all significant digits,
	and there's no leading zeros on the exponent (which is in
	fact bit-based) */
	param.base = 16;
	param.expfmt = "p%c%ld";
	goto conv_a;
	case 'A':
	param.base = -16;
	param.expfmt = "P%c%ld";
	conv_a:
	param.conv = DOPRNT_CONV_SCIENTIFIC;
	param.exptimes4 = 1;
	if (! seen_precision)
	param.prec = -1; /* default to all digits */
	param.showbase = DOPRNT_SHOWBASE_YES;
	param.showtrailing = 1;
	goto floating_a;

	case 'c':
	/* Let's assume wchar_t will be promoted to "int" in the call,
	the same as char will be. */
	(void) va_arg (ap, int);
	goto next;

	case 'd':
	case 'i':
	case 'u':
	integer:
	TRACE (printf ("integer, base=%d\n", param.base));
	if (! seen_precision)
	param.prec = -1;
	switch (type) {
	case 'j':
	/* Let's assume uintmax_t is the same size as intmax_t. */
	#if HAVE_INTMAX_T
	(void) va_arg (ap, intmax_t);
	#else
	ASSERT_FAIL (intmax_t not available);
	#endif
	break;
	case 'l':
	(void) va_arg (ap, long);
	break;
	case 'L':
	#if HAVE_LONG_LONG
	(void) va_arg (ap, long long);
	#else
	ASSERT_FAIL (long long not available);
	#endif
	break;
	case 'N':
	{
	mp_ptr xp;
	mp_size_t xsize, abs_xsize;
	mpz_t z;
	FLUSH ();
	xp = va_arg (ap, mp_ptr);
	PTR(z) = xp;
	xsize = (int) va_arg (ap, mp_size_t);
	abs_xsize = ABS (xsize);
	MPN_NORMALIZE (xp, abs_xsize);
	SIZ(z) = (xsize >= 0 ? abs_xsize : -abs_xsize);
	ASSERT_CODE (ALLOC(z) = abs_xsize);
	gmp_str = mpz_get_str (NULL, param.base, z);
	goto gmp_integer;
	}
	/* break; */
	case 'q':
	/* quad_t is probably the same as long long, but let's treat
	it separately just to be sure. Also let's assume u_quad_t
	will be the same size as quad_t. */
	#if HAVE_QUAD_T
	(void) va_arg (ap, quad_t);
	#else
	ASSERT_FAIL (quad_t not available);
	#endif
	break;
	case 'Q':
	FLUSH ();
	gmp_str = mpq_get_str (NULL, param.base, va_arg(ap, mpq_srcptr));
	goto gmp_integer;
	case 't':
	#if HAVE_PTRDIFF_T
	(void) va_arg (ap, ptrdiff_t);
	#else
	ASSERT_FAIL (ptrdiff_t not available);
	#endif
	break;
	case 'z':
	(void) va_arg (ap, size_t);
	break;
	case 'Z':
	{
	int ret;
	FLUSH ();
	gmp_str = mpz_get_str (NULL, param.base,
	va_arg (ap, mpz_srcptr));
	gmp_integer:
	ret = __gmp_doprnt_integer (funs, data, &param, gmp_str);
	__GMP_FREE_FUNC_TYPE (gmp_str, strlen(gmp_str)+1, char);
	DOPRNT_ACCUMULATE (ret);
	va_copy (last_ap, ap);
	last_fmt = fmt;
	}
	break;
	default:
	/* default is an "int", and this includes h=short and hh=char
	since they're promoted to int in a function call */
	(void) va_arg (ap, int);
	break;
	}
	goto next;

	case 'E':
	param.base = -10;
	param.expfmt = "E%c%02ld";
	/FALLTHRU/
	case 'e':
	param.conv = DOPRNT_CONV_SCIENTIFIC;
	floating:
	if (param.showbase == DOPRNT_SHOWBASE_NONZERO)
	{
	/* # in %e, %f and %g */
	param.showpoint = 1;
	param.showtrailing = 1;
	}
	floating_a:
	switch (type) {
	case 'F':
	FLUSH ();
	DOPRNT_ACCUMULATE (__gmp_doprnt_mpf (funs, data, &param,
	GMP_DECIMAL_POINT,
	va_arg (ap, mpf_srcptr)));
	va_copy (last_ap, ap);
	last_fmt = fmt;
	break;
	case 'L':
	#if HAVE_LONG_DOUBLE
	(void) va_arg (ap, long double);
	#else
	ASSERT_FAIL (long double not available);
	#endif
	break;
	default:
	(void) va_arg (ap, double);
	break;
	}
	goto next;

	case 'f':
	param.conv = DOPRNT_CONV_FIXED;
	goto floating;

	case 'F': /* mpf_t */
	case 'j': /* intmax_t */
	case 'L': /* long long */
	case 'N': /* mpn */
	case 'q': /* quad_t */
	case 'Q': /* mpq_t */
	case 't': /* ptrdiff_t */
	case 'z': /* size_t */
	case 'Z': /* mpz_t */
	set_type:
	type = fchar;
	break;

	case 'G':
	param.base = -10;
	param.expfmt = "E%c%02ld";
	/FALLTHRU/
	case 'g':
	param.conv = DOPRNT_CONV_GENERAL;
	param.showtrailing = 0;
	goto floating;

	case 'h':
	if (type != 'h')
	goto set_type;
	type = 'H'; /* internal code for "hh" */
	break;

	case 'l':
	if (type != 'l')
	goto set_type;
	type = 'L'; /* "ll" means "L" */
	break;

	case 'm':
	/* glibc strerror(errno), no argument */
	goto next;

	case 'M': /* mp_limb_t */
	/* mung format string to l or ll and let plain printf handle it */
	#if _LONG_LONG_LIMB
	memmove (fmt+1, fmt, strlen (fmt)+1);
	fmt[-1] = 'l';
	fmt[0] = 'l';
	fmt++;
	type = 'L';
	#else
	fmt[-1] = 'l';
	type = 'l';
	#endif
	break;

	case 'n':
	{
	void *p;
	FLUSH ();
	p = va_arg (ap, void *);
	switch (type) {
	case '\0': * (int *) p = retval; break;
	case 'F': mpf_set_si ((mpf_ptr) p, (long) retval); break;
	case 'H': * (char *) p = retval; break;
	case 'h': * (short *) p = retval; break;
	#if HAVE_INTMAX_T
	case 'j': * (intmax_t *) p = retval; break;
	#else
	case 'j': ASSERT_FAIL (intmax_t not available); break;
	#endif
	case 'l': * (long *) p = retval; break;
	#if HAVE_QUAD_T && HAVE_LONG_LONG
	case 'q':
	ASSERT_ALWAYS (sizeof (quad_t) == sizeof (long long));
	/FALLTHRU/
	#else
	case 'q': ASSERT_FAIL (quad_t not available); break;
	#endif
	#if HAVE_LONG_LONG
	case 'L': * (long long *) p = retval; break;
	#else
	case 'L': ASSERT_FAIL (long long not available); break;
	#endif
	case 'N':
	{
	mp_size_t n;
	n = va_arg (ap, mp_size_t);
	n = ABS (n);
	if (n != 0)
	{
	* (mp_ptr) p = retval;
	MPN_ZERO ((mp_ptr) p + 1, n - 1);
	}
	}
	break;
	case 'Q': mpq_set_si ((mpq_ptr) p, (long) retval, 1L); break;
	#if HAVE_PTRDIFF_T
	case 't': * (ptrdiff_t *) p = retval; break;
	#else
	case 't': ASSERT_FAIL (ptrdiff_t not available); break;
	#endif
	case 'z': * (size_t *) p = retval; break;
	case 'Z': mpz_set_si ((mpz_ptr) p, (long) retval); break;
	}
	}
	va_copy (last_ap, ap);
	last_fmt = fmt;
	goto next;

	case 'o':
	param.base = 8;
	goto integer;

	case 'p':
	case 's':
	/* "void " will be good enough for "char " or "wchar_t *", no
	need for separate code. */
	(void) va_arg (ap, const void *);
	goto next;

	case 'x':
	param.base = 16;
	goto integer;
	case 'X':
	param.base = -16;
	goto integer;

	case '%':
	goto next;

	case '#':
	param.showbase = DOPRNT_SHOWBASE_NONZERO;
	break;

	case '\'':
	/* glibc digit grouping, just pass it through, no support for it
	on gmp types */
	break;

	case '+':
	case ' ':
	param.sign = fchar;
	break;

	case '-':
	param.justify = DOPRNT_JUSTIFY_LEFT;
	break;
	case '.':
	seen_precision = 1;
	param.prec = -1; /* "." alone means all necessary digits */
	value = &param.prec;
	break;

	case '*':
	{
	int n = va_arg (ap, int);

	if (value == &param.width)
	{
	/* negative width means left justify */
	if (n < 0)
	{
	param.justify = DOPRNT_JUSTIFY_LEFT;
	n = -n;
	}
	param.width = n;
	}
	else
	{
	/* don't allow negative precision */
	param.prec = MAX (0, n);
	}
	}
	break;

	case '0':
	if (value == &param.width)
	{
	/* in width field, set fill */
	param.fill = '0';

	/* for right justify, put the fill after any minus sign */
	if (param.justify == DOPRNT_JUSTIFY_RIGHT)
	param.justify = DOPRNT_JUSTIFY_INTERNAL;
	}
	else
	{
	/* in precision field, set value */
	*value = 0;
	}
	break;

	case '1': case '2': case '3': case '4': case '5':
	case '6': case '7': case '8': case '9':
	/* process all digits to form a value */
	{
	int n = 0;
	do {
	n = n * 10 + (fchar-'0');
	fchar = *fmt++;
	} while (isascii (fchar) && isdigit (fchar));
	fmt--; /* unget the non-digit */
	*value = n;
	}
	break;

	default:
	/* something invalid */
	ASSERT (0);
	goto next;
	}
	}

	next:
	/* Stop parsing the current "%" format, look for a new one. */
	;
	}

	TRACE (printf ("remainder: \"%s\"\n", last_fmt));
	if (*last_fmt != '\0')
	DOPRNT_FORMAT (last_fmt, last_ap);

	if (funs->final != NULL)
	if ((*funs->final) (data) == -1)
	goto error;

	done:
	__GMP_FREE_FUNC_TYPE (alloc_fmt, alloc_fmt_size, char);
	return retval;

	error:
	retval = -1;
	goto done;
	}