contrib/gmp/printf/sprintffuns.c

   1 /* __gmp_sprintf_funs -- support for gmp_sprintf and gmp_vsprintf.
   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 <stdlib.h>
  34 #include <string.h>
  35
  36 #include "gmp.h"
  37 #include "gmp-impl.h"
  38
  39
  40 /* The data parameter "bufp" points to a "char *buf" which is the next
  41    character to be written, having started as the destination from the
  42    application.  This is then increased each time output is produced.  */
  43
  44
  45 /* If vsprintf returns -1 then pass it upwards.  It doesn't matter that
  46    "*bufp" is ruined in this case, since gmp_doprint will bail out
  47    immediately anyway.  */
  48 static int
  49 gmp_sprintf_format (char **bufp, const char *fmt, va_list ap)
  50 {
  51   char  *buf = *bufp;
  52   int   ret;
  53   vsprintf (buf, fmt, ap);
  54   ret = strlen (buf);
  55   *bufp = buf + ret;
  56   return ret;
  57 }
  58
  59 static int
  60 gmp_sprintf_memory (char **bufp, const char *str, size_t len)
  61 {
  62   char  *buf = *bufp;
  63   *bufp = buf + len;
  64   memcpy (buf, str, len);
  65   return len;
  66 }
  67
  68 static int
  69 gmp_sprintf_reps (char **bufp, int c, int reps)
  70 {
  71   char  *buf = *bufp;
  72   ASSERT (reps >= 0);
  73   *bufp = buf + reps;
  74   memset (buf, c, reps);
  75   return reps;
  76 }
  77
  78 static int
  79 gmp_sprintf_final (char **bufp, int c, int reps)
  80 {
  81   char  *buf = *bufp;
  82   *buf = '\0';
  83   return 0;
  84 }
  85
  86 const struct doprnt_funs_t  __gmp_sprintf_funs = {
  87   (doprnt_format_t) gmp_sprintf_format,
  88   (doprnt_memory_t) gmp_sprintf_memory,
  89   (doprnt_reps_t)   gmp_sprintf_reps,
  90   (doprnt_final_t)  gmp_sprintf_final
  91 };