contrib/gmp/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 the GNU Lesser General Public License as published by
  13 the Free Software Foundation; either version 3 of the License, or (at your
  14 option) any later version.
  15
  16 The GNU MP Library is distributed in the hope that it will be useful, but
  17 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  18 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  19 License for more details.
  20
  21 You should have received a copy of the GNU Lesser General Public License
  22 along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
  23
  24 #include "config.h"
  25
  26 #if HAVE_STDARG
  27 #include <stdarg.h>
  28 #else
  29 #include <varargs.h>
  30 #endif
  31
  32 #include <stdio.h>
  33 #include <string.h>
  34
  35 #include "gmp.h"
  36 #include "gmp-impl.h"
  37
  38 /* SunOS 4 stdio.h doesn't provide a prototype for this */
  39 #if ! HAVE_DECL_VFPRINTF
  40 int vfprintf __GMP_PROTO ((FILE *, const char *, va_list));
  41 #endif
  42
  43
  44 static int
  45 gmp_fprintf_memory (FILE *fp, const char *str, size_t len)
  46 {
  47   return fwrite (str, 1, len, fp);
  48 }
  49
  50 /* glibc putc is a function, at least when it's in multi-threaded mode or
  51    some such, so fwrite chunks instead of making many calls. */
  52 static int
  53 gmp_fprintf_reps (FILE *fp, int c, int reps)
  54 {
  55   char  buf[256];
  56   int   i, piece, ret;
  57   ASSERT (reps >= 0);
  58
  59   memset (buf, c, MIN (reps, sizeof (buf)));
  60   for (i = reps; i > 0; i -= sizeof (buf))
  61     {
  62       piece = MIN (i, sizeof (buf));
  63       ret = fwrite (buf, 1, piece, fp);
  64       if (ret == -1)
  65         return ret;
  66       ASSERT (ret == piece);
  67     }
  68
  69   return reps;
  70 }
  71
  72 const struct doprnt_funs_t  __gmp_fprintf_funs = {
  73   (doprnt_format_t) vfprintf,
  74   (doprnt_memory_t) gmp_fprintf_memory,
  75   (doprnt_reps_t)   gmp_fprintf_reps,
  76 };