assuan/src/funopen.c

   1 /* funopen.c - Replacement for funopen.
   2  * Copyright (C) 2003, 2005 Free Software Foundation, Inc.
   3  *
   4  * This file is part of Assuan.
   5  *
   6  * Assuan is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as
   8  * published by the Free Software Foundation; either version 2.1 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * Assuan is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <stdio.h>
  25
  26
  27 /* Replacement for the *BSD function:
  28
  29   FILE *funopen (void *cookie,
  30                  int (*readfn)(void *, char *, int),
  31                  int (*writefn)(void *, const char *, int),
  32                  fpos_t (*seekfn)(void *, fpos_t, int),
  33                  int (*closefn)(void *));
  34
  35   The functions to provide my either be NULL if not required or
  36   similar to the unistd function with the exception of using the
  37   cookie instead of the fiel descripor.
  38 */
  39
  40
  41 #ifdef HAVE_FOPENCOOKIE
  42 FILE *
  43 _assuan_funopen(void *cookie,
  44                 cookie_read_function_t *readfn,
  45                 cookie_write_function_t *writefn,
  46                 cookie_seek_function_t *seekfn,
  47                 cookie_close_function_t *closefn)
  48 {
  49   cookie_io_functions_t io;
  50
  51   io.read = readfn;
  52   io.write = writefn;
  53   io.seek = seekfn;
  54   io.close = closefn;
  55
  56   return fopencookie (cookie,
  57                       readfn ? ( writefn ? "rw" : "r" )
  58                       : ( writefn ? "w" : ""), io);
  59 }
  60 #else
  61 #error No known way to implement funopen.
  62 #endif