1  /* __gmp_fprintf_funs -- support for formatted output to FILEs.
       2  
       3     THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY.  THEY'RE ALMOST
       4     CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
       5     FUTURE GNU MP RELEASES.
       6  
       7  Copyright 2001 Free Software Foundation, Inc.
       8  
       9  This file is part of the GNU MP Library.
      10  
      11  The GNU MP Library is free software; you can redistribute it and/or modify
      12  it under the terms of either:
      13  
      14    * the GNU Lesser General Public License as published by the Free
      15      Software Foundation; either version 3 of the License, or (at your
      16      option) any later version.
      17  
      18  or
      19  
      20    * the GNU General Public License as published by the Free Software
      21      Foundation; either version 2 of the License, or (at your option) any
      22      later version.
      23  
      24  or both in parallel, as here.
      25  
      26  The GNU MP Library is distributed in the hope that it will be useful, but
      27  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      28  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      29  for more details.
      30  
      31  You should have received copies of the GNU General Public License and the
      32  GNU Lesser General Public License along with the GNU MP Library.  If not,
      33  see https://www.gnu.org/licenses/.  */
      34  
      35  #include <stdarg.h>
      36  #include <stdio.h>
      37  #include <string.h>
      38  
      39  #include "gmp-impl.h"
      40  
      41  /* SunOS 4 stdio.h doesn't provide a prototype for this */
      42  #if ! HAVE_DECL_VFPRINTF
      43  int vfprintf (FILE *, const char *, va_list);
      44  #endif
      45  
      46  
      47  static int
      48  gmp_fprintf_memory (FILE *fp, const char *str, size_t len)
      49  {
      50    return fwrite (str, 1, len, fp);
      51  }
      52  
      53  /* glibc putc is a function, at least when it's in multi-threaded mode or
      54     some such, so fwrite chunks instead of making many calls. */
      55  static int
      56  gmp_fprintf_reps (FILE *fp, int c, int reps)
      57  {
      58    char  buf[256];
      59    int   i, piece, ret;
      60    ASSERT (reps >= 0);
      61  
      62    memset (buf, c, MIN (reps, sizeof (buf)));
      63    for (i = reps; i > 0; i -= sizeof (buf))
      64      {
      65        piece = MIN (i, sizeof (buf));
      66        ret = fwrite (buf, 1, piece, fp);
      67        if (ret == -1)
      68          return ret;
      69        ASSERT (ret == piece);
      70      }
      71  
      72    return reps;
      73  }
      74  
      75  const struct doprnt_funs_t  __gmp_fprintf_funs = {
      76    (doprnt_format_t) vfprintf,
      77    (doprnt_memory_t) gmp_fprintf_memory,
      78    (doprnt_reps_t)   gmp_fprintf_reps,
      79  };