/* assuan-util.c - Utility functions for Assuan 
 *	Copyright (C) 2001 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GnuPG is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "assuan-defs.h"

#ifdef HAVE_JNLIB_LOGGING
#include "../jnlib/logging.h"
#endif


static void *(*alloc_func)(size_t n) = malloc;
static void *(*realloc_func)(void *p, size_t n) = realloc;
static void (*free_func)(void*) = free;



void
assuan_set_malloc_hooks ( void *(*new_alloc_func)(size_t n),
                          void *(*new_realloc_func)(void *p, size_t n),
                          void (*new_free_func)(void*) )
{
  alloc_func	    = new_alloc_func;
  realloc_func      = new_realloc_func;
  free_func	    = new_free_func;
}

void *
_assuan_malloc (size_t n)
{
  return alloc_func (n);
}

void *
_assuan_realloc (void *a, size_t n)
{
  return realloc_func (a, n);
}

void *
_assuan_calloc (size_t n, size_t m)
{
  void *p = _assuan_malloc (n*m);
  if (p)
    memset (p, 0, n* m);
  return p;
}

void
_assuan_free (void *p)
{
  if (p)
    free_func (p);
}



/* Store the error in the context so that the error sending function
  can take out a descriptive text.  Inside the assuan code, use the
  macro set_error instead of this function. */
int
assuan_set_error (ASSUAN_CONTEXT ctx, int err, const char *text)
{
  ctx->err_no = err;
  ctx->err_str = text;
  return err;
}

void
assuan_set_pointer (ASSUAN_CONTEXT ctx, void *pointer)
{
  if (ctx)
    ctx->user_pointer = pointer;
}

void *
assuan_get_pointer (ASSUAN_CONTEXT ctx)
{
  return ctx? ctx->user_pointer : NULL;
}


void
assuan_set_log_stream (ASSUAN_CONTEXT ctx, FILE *fp)
{
  if (ctx)
    {
      if (ctx->log_fp)
        fflush (ctx->log_fp);
      ctx->log_fp = fp;
    }
}


void
assuan_begin_confidential (ASSUAN_CONTEXT ctx)
{
  if (ctx)
    {
      ctx->confidential = 1;
    }
}

void
assuan_end_confidential (ASSUAN_CONTEXT ctx)
{
  if (ctx)
    {
      ctx->confidential = 0;
    }
}

void
_assuan_log_print_buffer (FILE *fp, const void *buffer, size_t length)
{
  const unsigned char *s;
  int n;

  for (n=length,s=buffer; n; n--, s++)
    {
      if (*s < ' ' || (*s >= 0x7f && *s <= 0xa0))
        break;
    }
  s = buffer;
  if (!n && *s != '[')
    fwrite (buffer, length, 1, fp);
  else
    {
      putc ('[', fp);
      for (n=0; n < length; n++, s++)
          fprintf (fp, " %02x", *s);
      putc (' ', fp);
      putc (']', fp);
    }
}


/* print a user supplied string after filtering out potential bad
   characters*/
void
_assuan_log_sanitized_string (const char *string)
{
  const unsigned char *s = (const unsigned char*)string;
#ifdef HAVE_JNLIB_LOGGING
  FILE *fp = log_get_stream ();
#else
  FILE *fp = stderr;
#endif

  for (; *s; s++)
    {
      if (*s < 0x20 || (*s >= 0x7f && *s <= 0xa0))
        {
          putc ('\\', fp);
          if (*s == '\n')
            putc ('n', fp);
          else if (*s == '\r')
            putc ('r', fp);
          else if (*s == '\f')
            putc ('f', fp);
          else if (*s == '\v')
            putc ('v', fp);
          else if (*s == '\b')
            putc ('b', fp);
          else if (!*s)
            putc ('0', fp);
          else
            fprintf (fp, "x%02x", *s );
	}
      else
        putc (*s, fp);
    }
}


