/*

 * Copyright (c) 2011 Collabora Ltd

 * Copyright (c) 2012 Stef Walter

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *     * Redistributions of source code must retain the above

 *       copyright notice, this list of conditions and the

 *       following disclaimer.

 *     * Redistributions in binary form must reproduce the

 *       above copyright notice, this list of conditions and

 *       the following disclaimer in the documentation and/or

 *       other materials provided with the distribution.

 *     * The names of contributors to this software may not be

 *       used to endorse or promote products derived from this

 *       software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,

 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS

 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF

 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 *

 *

 * CONTRIBUTORS

 *  Stef Walter <stef@thewalter.net>

 */

#include "config.h"

/*

 * Oh god. glibc is nasty. Changes behavior and definitions of POSIX

 * functions to completely different signatures depending on defines

 */

#define _POSIX_C_SOURCE 200112L

#include "compat.h"

#define P11_DEBUG_FLAG P11_DEBUG_LIB

#include "debug.h"

#include "message.h"

#include <assert.h>

#include <errno.h>

#ifdef HAVE_LOCALE_H

#include <locale.h>

#endif

#include <stdarg.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

bool p11_print_messages = false;

#ifdef HAVE_STRERROR_L

locale_t p11_message_locale = (locale_t) 0;

#endif

static char *

default_message_storage (void)

{

  static char message[P11_MESSAGE_MAX] = { 0, };

  return message;

}

/* Function pointer declared in message.h as extern */

char * (* p11_message_storage) (void) = default_message_storage;

void

p11_message_store (const char* msg,

                   size_t length)

{

  char *buffer;

  /*

   * p11_message_storage() is called to get a storage location for

   * the last message. It defaults to a globally allocated buffer

   * but is overridden in library.c with a function that returns

   * per thread buffers.

   *

   * The returned value is P11_MESSAGE_MAX bytes long

   */

  buffer = p11_message_storage ();

  if (length > P11_MESSAGE_MAX - 1)

    length = P11_MESSAGE_MAX - 1;

  if (buffer != NULL) {

    memcpy (buffer, msg, length);

    buffer[length] = 0;

  }

}

void

p11_message_err (int errnum,

                 const char* msg,

                 ...)

{

  char buffer[P11_MESSAGE_MAX];

  char strerr[P11_MESSAGE_MAX];

  va_list va;

  size_t length;

  va_start (va, msg);

  length = vsnprintf (buffer, P11_MESSAGE_MAX - 1, msg, va);

  va_end (va);

  /* Was it truncated? */

  if (length > P11_MESSAGE_MAX - 1)

    length = P11_MESSAGE_MAX - 1;

  buffer[length] = 0;

  snprintf (strerr, sizeof (strerr), "Unknown error %d", errnum);

#ifdef HAVE_STRERROR_L

  if (p11_message_locale != (locale_t) 0)

    strncpy (strerr, strerror_l (errnum, p11_message_locale), sizeof (strerr));

#else

  strerror_r (errnum, strerr, sizeof (strerr));

#endif

  strerr[P11_MESSAGE_MAX - 1] = 0;

  p11_message ("%s: %s", buffer, strerr);

}

void

p11_message (const char* msg,

             ...)

{

  char buffer[P11_MESSAGE_MAX];

  va_list va;

  size_t length;

  va_start (va, msg);

  length = vsnprintf (buffer, P11_MESSAGE_MAX - 1, msg, va);

  va_end (va);

  /* Was it truncated? */

  if (length > P11_MESSAGE_MAX - 1)

    length = P11_MESSAGE_MAX - 1;

  buffer[length] = 0;

  /* If printing is not disabled, just print out */

  if (p11_print_messages)

    fprintf (stderr, "p11-kit: %s\n", buffer);

  else

    p11_debug_message (P11_DEBUG_LIB, "message: %s", buffer);

  p11_message_store (buffer, length);

}

void

p11_message_quiet (void)

{

  p11_print_messages = false;

}

void

p11_message_loud (void)

{

  p11_print_messages = true;

}

const char *

p11_message_last (void)

{

  char *buffer;

  buffer = p11_message_storage ();

  return buffer && buffer[0] ? buffer : NULL;

}

void

p11_message_clear (void)

{

  char *buffer;

  buffer = p11_message_storage ();

  if (buffer != NULL)

    buffer[0] = 0;

}