assuan/assuan-util.c

   1 /* assuan-util.c - Utility functions for Assuan
   2  * Copyright (C) 2001, 2002, 2003, 2004, 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 #include <config.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <ctype.h>
  25 #include <errno.h>
  26
  27 #include "assuan-defs.h"
  28
  29 static void *(*alloc_func)(size_t n) = malloc;
  30 static void *(*realloc_func)(void *p, size_t n) = realloc;
  31 static void (*free_func)(void*) = free;
  32
  33 struct assuan_io_hooks _assuan_io_hooks;
  34
  35
  36
  37 void
  38 assuan_set_malloc_hooks ( void *(*new_alloc_func)(size_t n),
  39                           void *(*new_realloc_func)(void *p, size_t n),
  40                           void (*new_free_func)(void*) )
  41 {
  42   alloc_func        = new_alloc_func;
  43   realloc_func      = new_realloc_func;
  44   free_func         = new_free_func;
  45 }
  46
  47
  48 void
  49 assuan_set_io_hooks (assuan_io_hooks_t io_hooks)
  50 {
  51   _assuan_io_hooks.read_hook = NULL;
  52   _assuan_io_hooks.write_hook = NULL;
  53   if (io_hooks)
  54     {
  55       _assuan_io_hooks.read_hook = io_hooks->read_hook;
  56       _assuan_io_hooks.write_hook = io_hooks->write_hook;
  57     }
  58 }
  59
  60
  61 void *
  62 _assuan_malloc (size_t n)
  63 {
  64   return alloc_func (n);
  65 }
  66
  67 void *
  68 _assuan_realloc (void *a, size_t n)
  69 {
  70   return realloc_func (a, n);
  71 }
  72
  73 void *
  74 _assuan_calloc (size_t n, size_t m)
  75 {
  76   void *p;
  77   size_t nbytes;
  78
  79   nbytes = n * m;
  80   if (m && nbytes / m != n)
  81     {
  82       errno = ENOMEM;
  83       return NULL;
  84     }
  85
  86   p = _assuan_malloc (nbytes);
  87   if (p)
  88     memset (p, 0, nbytes);
  89   return p;
  90 }
  91
  92 void
  93 _assuan_free (void *p)
  94 {
  95   if (p)
  96     free_func (p);
  97 }
  98
  99 \f
 100 /* Store the error in the context so that the error sending function
 101   can take out a descriptive text.  Inside the assuan code, use the
 102   macro set_error instead of this function. */
 103 int
 104 assuan_set_error (assuan_context_t ctx, int err, const char *text)
 105 {
 106   ctx->err_no = err;
 107   ctx->err_str = text;
 108   return err;
 109 }
 110
 111 void assuan_set_finish_handler(assuan_context_t ctx,
 112         void (*handler)(assuan_context_t))
 113 {
 114     if (ctx)
 115         ctx->user_finish_handler = handler;
 116 }
 117
 118 void
 119 assuan_set_pointer (assuan_context_t ctx, void *pointer)
 120 {
 121   if (ctx)
 122     ctx->user_pointer = pointer;
 123 }
 124
 125 void *
 126 assuan_get_pointer (assuan_context_t ctx)
 127 {
 128   return ctx? ctx->user_pointer : NULL;
 129 }
 130
 131
 132 void
 133 assuan_begin_confidential (assuan_context_t ctx)
 134 {
 135   if (ctx)
 136     {
 137       ctx->confidential = 1;
 138     }
 139 }
 140
 141 void
 142 assuan_end_confidential (assuan_context_t ctx)
 143 {
 144   if (ctx)
 145     {
 146       ctx->confidential = 0;
 147     }
 148 }
 149
 150
 151 void
 152 assuan_set_io_monitor (assuan_context_t ctx,
 153                        unsigned int (*monitor)(assuan_context_t ctx,
 154                                                int direction,
 155                                                const char *line,
 156                                                size_t linelen))
 157 {
 158   if (ctx)
 159     {
 160       ctx->io_monitor = monitor;
 161     }
 162 }
 163
 164
 165
 166
 167 /* For context CTX, set the flag FLAG to VALUE.  Values for flags
 168    are usually 1 or 0 but certain flags might allow for other values;
 169    see the description of the type assuan_flag_t for details. */
 170 void
 171 assuan_set_flag (assuan_context_t ctx, assuan_flag_t flag, int value)
 172 {
 173   if (!ctx)
 174     return;
 175   switch (flag)
 176     {
 177     case ASSUAN_NO_WAITPID: ctx->flags.no_waitpid = value; break;
 178     case ASSUAN_CONFIDENTIAL: ctx->confidential = value; break;
 179     }
 180 }
 181
 182 /* Return the VALUE of FLAG in context CTX. */
 183 int
 184 assuan_get_flag (assuan_context_t ctx, assuan_flag_t flag)
 185 {
 186   if (!ctx)
 187     return 0;
 188   switch (flag)
 189     {
 190     case ASSUAN_NO_WAITPID: return ctx->flags.no_waitpid;
 191     case ASSUAN_CONFIDENTIAL: return ctx->confidential;
 192     }
 193   return 0;
 194 }
 195