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      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 };
     80