source/libs/gmp/gmp-src/printf/printffuns.c

   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.h"
  40 #include "gmp-impl.h"
  41
  42 /* SunOS 4 stdio.h doesn't provide a prototype for this */
  43 #if ! HAVE_DECL_VFPRINTF
  44 int vfprintf (FILE *, const char *, va_list);
  45 #endif
  46
  47
  48 static int
  49 gmp_fprintf_memory (FILE *fp, const char *str, size_t len)
  50 {
  51   return fwrite (str, 1, len, fp);
  52 }
  53
  54 /* glibc putc is a function, at least when it's in multi-threaded mode or
  55    some such, so fwrite chunks instead of making many calls. */
  56 static int
  57 gmp_fprintf_reps (FILE *fp, int c, int reps)
  58 {
  59   char  buf[256];
  60   int   i, piece, ret;
  61   ASSERT (reps >= 0);
  62
  63   memset (buf, c, MIN (reps, sizeof (buf)));
  64   for (i = reps; i > 0; i -= sizeof (buf))
  65     {
  66       piece = MIN (i, sizeof (buf));
  67       ret = fwrite (buf, 1, piece, fp);
  68       if (ret == -1)
  69         return ret;
  70       ASSERT (ret == piece);
  71     }
  72
  73   return reps;
  74 }
  75
  76 const struct doprnt_funs_t  __gmp_fprintf_funs = {
  77   (doprnt_format_t) vfprintf,
  78   (doprnt_memory_t) gmp_fprintf_memory,
  79   (doprnt_reps_t)   gmp_fprintf_reps,
  80 };