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 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 <stdlib.h>
      38  #include <string.h>
      39  
      40  #include "gmp-impl.h"
      41  
      42  
      43  /* The data parameter "bufp" points to a "char *buf" which is the next
      44     character to be written, having started as the destination from the
      45     application.  This is then increased each time output is produced.  */
      46  
      47  
      48  /* If vsprintf returns -1 then pass it upwards.  It doesn't matter that
      49     "*bufp" is ruined in this case, since gmp_doprint will bail out
      50     immediately anyway.  */
      51  static int
      52  gmp_sprintf_format (char **bufp, const char *fmt, va_list ap)
      53  {
      54    char  *buf = *bufp;
      55    int   ret;
      56    vsprintf (buf, fmt, ap);
      57    ret = strlen (buf);
      58    *bufp = buf + ret;
      59    return ret;
      60  }
      61  
      62  static int
      63  gmp_sprintf_memory (char **bufp, const char *str, size_t len)
      64  {
      65    char  *buf = *bufp;
      66    *bufp = buf + len;
      67    memcpy (buf, str, len);
      68    return len;
      69  }
      70  
      71  static int
      72  gmp_sprintf_reps (char **bufp, int c, int reps)
      73  {
      74    char  *buf = *bufp;
      75    ASSERT (reps >= 0);
      76    *bufp = buf + reps;
      77    memset (buf, c, reps);
      78    return reps;
      79  }
      80  
      81  static int
      82  gmp_sprintf_final (char **bufp)
      83  {
      84    char  *buf = *bufp;
      85    *buf = '\0';
      86    return 0;
      87  }
      88  
      89  const struct doprnt_funs_t  __gmp_sprintf_funs = {
      90    (doprnt_format_t) gmp_sprintf_format,
      91    (doprnt_memory_t) gmp_sprintf_memory,
      92    (doprnt_reps_t)   gmp_sprintf_reps,
      93    (doprnt_final_t)  gmp_sprintf_final
      94  };