extconf.c

/*!
  \brief Defines a structure to be used to hold a read/write list of specified type.
  \param name This will be the name of the defined structure.
  \param type This is the type of each list entry.

  This macro creates a structure definition that can be used
  to hold a list of the entries of type \a type. It does not actually
  declare (allocate) a structure; to do that, either follow this
  macro with the desired name of the instance you wish to declare,
  or use the specified \a name to declare instances elsewhere.

  Example usage:
  \code
  static AST_RWLIST_HEAD(entry_list, entry) entries;
  \endcode

  This would define \c struct \c entry_list, and declare an instance of it named
  \a entries, all intended to hold a list of type \c struct \c entry.
*/
#define AST_RWLIST_HEAD(name, type)                                     \
struct name {                                                           \
        struct type *first;                                             \
        struct type *last;                                              \
        ast_rwlock_t lock;                                              \
}

/*!
  \brief Defines a structure to be used to hold a list of specified type (with no lock).
  \param name This will be the name of the defined structure.
  \param type This is the type of each list entry.

  This macro creates a structure definition that can be used
  to hold a list of the entries of type \a type. It does not actually
  declare (allocate) a structure; to do that, either follow this
  macro with the desired name of the instance you wish to declare,
  or use the specified \a name to declare instances elsewhere.

  Example usage:
  \code
  static AST_LIST_HEAD_NOLOCK(entry_list, entry) entries;
  \endcode

  This would define \c struct \c entry_list, and declare an instance of it named
  \a entries, all intended to hold a list of type \c struct \c entry.
*/
#define AST_LIST_HEAD_NOLOCK(name, type)				\
struct name {								\
	struct type *first;						\
	struct type *last;						\
}

/*!
  \brief Defines initial values for a declaration of AST_LIST_HEAD
*/
#define AST_LIST_HEAD_INIT_VALUE	{		\
	.first = NULL,					\
	.last = NULL,					\
	.lock = AST_MUTEX_INIT_VALUE,			\
	}

/*!
  \brief Defines initial values for a declaration of AST_RWLIST_HEAD
*/
#define AST_RWLIST_HEAD_INIT_VALUE      {               \
        .first = NULL,                                  \
        .last = NULL,                                   \
        .lock = AST_RWLOCK_INIT_VALUE,                  \
        }

/*!
  \brief Defines initial values for a declaration of AST_LIST_HEAD_NOLOCK
*/
#define AST_LIST_HEAD_NOLOCK_INIT_VALUE	{	\
	.first = NULL,					\
	.last = NULL,					\
	}

/*!
  \brief Defines a structure to be used to hold a list of specified type, statically initialized.
  \param name This will be the name of the defined structure.
  \param type This is the type of each list entry.

  This macro creates a structure definition that can be used
  to hold a list of the entries of type \a type, and allocates an instance
  of it, initialized to be empty.

  Example usage:
  \code
  static AST_LIST_HEAD_STATIC(entry_list, entry);
  \endcode

  This would define \c struct \c entry_list, intended to hold a list of
  type \c struct \c entry.
*/
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS)
#define AST_LIST_HEAD_STATIC(name, type)				\
struct name {								\
	struct type *first;						\
	struct type *last;						\
	ast_mutex_t lock;						\
} name;									\
static void  __attribute__((constructor)) init_##name(void)		\
{									\
        AST_LIST_HEAD_INIT(&name);					\
}									\
static void  __attribute__((destructor)) fini_##name(void)		\
{									\
        AST_LIST_HEAD_DESTROY(&name);					\
}									\
struct __dummy_##name
#else
#define AST_LIST_HEAD_STATIC(name, type)				\
struct name {								\
	struct type *first;						\
	struct type *last;						\
	ast_mutex_t lock;						\
} name = AST_LIST_HEAD_INIT_VALUE
#endif

/*!
  \brief Defines a structure to be used to hold a read/write list of specified type, statically initialized.
  \param name This will be the name of the defined structure.
  \param type This is the type of each list entry.

  This macro creates a structure definition that can be used
  to hold a list of the entries of type \a type, and allocates an instance
  of it, initialized to be empty.

  Example usage:
  \code
  static AST_RWLIST_HEAD_STATIC(entry_list, entry);
  \endcode

  This would define \c struct \c entry_list, intended to hold a list of
  type \c struct \c entry.
*/
#ifndef AST_RWLOCK_INIT_VALUE
#define AST_RWLIST_HEAD_STATIC(name, type)                              \
struct name {                                                           \
        struct type *first;                                             \
        struct type *last;                                              \
        ast_rwlock_t lock;                                              \
} name;                                                                 \
static void  __attribute__((constructor)) init_##name(void)            \
{                                                                       \
        AST_RWLIST_HEAD_INIT(&name);                                    \
}                                                                       \
static void  __attribute__((destructor)) fini_##name(void)             \
{                                                                       \
        AST_RWLIST_HEAD_DESTROY(&name);                                 \
}                                                                       \
struct __dummy_##name
#else
#define AST_RWLIST_HEAD_STATIC(name, type)                              \
struct name {                                                           \
        struct type *first;                                             \
        struct type *last;                                              \
        ast_rwlock_t lock;                                              \
} name = AST_RWLIST_HEAD_INIT_VALUE
#endif

/*!
  \brief Defines a structure to be used to hold a list of specified type, statically initialized.

  This is the same as AST_LIST_HEAD_STATIC, except without the lock included.
*/
#define AST_LIST_HEAD_NOLOCK_STATIC(name, type)				\
struct name {								\
	struct type *first;						\
	struct type *last;						\
} name = AST_LIST_HEAD_NOLOCK_INIT_VALUE

/*!
  \brief Initializes a list head structure with a specified first entry.
  \param head This is a pointer to the list head structure
  \param entry pointer to the list entry that will become the head of the list

  This macro initializes a list head structure by setting the head
  entry to the supplied value and recreating the embedded lock.
*/
#define AST_LIST_HEAD_SET(head, entry) do {				\
	(head)->first = (entry);					\
	(head)->last = (entry);						\
	ast_mutex_init(&(head)->lock);					\
} while (0)

/*!
  \brief Initializes an rwlist head structure with a specified first entry.
  \param head This is a pointer to the list head structure
  \param entry pointer to the list entry that will become the head of the list

  This macro initializes a list head structure by setting the head
  entry to the supplied value and recreating the embedded lock.
*/
#define AST_RWLIST_HEAD_SET(head, entry) do {                           \
        (head)->first = (entry);                                        \
        (head)->last = (entry);                                         \
        ast_rwlock_init(&(head)->lock);                                 \
} while (0)

/*!
  \brief Initializes a list head structure with a specified first entry.
  \param head This is a pointer to the list head structure
  \param entry pointer to the list entry that will become the head of the list

  This macro initializes a list head structure by setting the head
  entry to the supplied value.
*/
#define AST_LIST_HEAD_SET_NOLOCK(head, entry) do {			\
	(head)->first = (entry);					\
	(head)->last = (entry);						\
} while (0)

/*!
  \brief Declare a forward link structure inside a list entry.
  \param type This is the type of each list entry.

  This macro declares a structure to be used to link list entries together.
  It must be used inside the definition of the structure named in
  \a type, as follows:

  \code
  struct list_entry {
  	...
  	AST_LIST_ENTRY(list_entry) list;
  }
  \endcode

  The field name \a list here is arbitrary, and can be anything you wish.
*/
#define AST_LIST_ENTRY(type)						\
struct {								\
	struct type *next;						\
}

#define AST_RWLIST_ENTRY AST_LIST_ENTRY
 
/*!
  \brief Returns the first entry contained in a list.
  \param head This is a pointer to the list head structure
 */
#define	AST_LIST_FIRST(head)	((head)->first)

#define AST_RWLIST_FIRST AST_LIST_FIRST

/*!
  \brief Returns the last entry contained in a list.
  \param head This is a pointer to the list head structure
 */
#define	AST_LIST_LAST(head)	((head)->last)

#define AST_RWLIST_LAST AST_LIST_LAST

/*!
  \brief Returns the next entry in the list after the given entry.
  \param elm This is a pointer to the current entry.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.
*/
#define AST_LIST_NEXT(elm, field)	((elm)->field.next)

#define AST_RWLIST_NEXT AST_LIST_NEXT

/*!
  \brief Checks whether the specified list contains any entries.
  \param head This is a pointer to the list head structure

  Returns non-zero if the list has entries, zero if not.
 */
#define	AST_LIST_EMPTY(head)	(AST_LIST_FIRST(head) == NULL)

#define AST_RWLIST_EMPTY AST_LIST_EMPTY

/*!
  \brief Loops over (traverses) the entries in a list.
  \param head This is a pointer to the list head structure
  \param var This is the name of the variable that will hold a pointer to the
  current list entry on each iteration. It must be declared before calling
  this macro.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.

  This macro is use to loop over (traverse) the entries in a list. It uses a
  \a for loop, and supplies the enclosed code with a pointer to each list
  entry as it loops. It is typically used as follows:
  \code
  static AST_LIST_HEAD(entry_list, list_entry) entries;
  ...
  struct list_entry {
  	...
  	AST_LIST_ENTRY(list_entry) list;
  }
  ...
  struct list_entry *current;
  ...
  AST_LIST_TRAVERSE(&entries, current, list) {
     (do something with current here)
  }
  \endcode
  \warning If you modify the forward-link pointer contained in the \a current entry while
  inside the loop, the behavior will be unpredictable. At a minimum, the following
  macros will modify the forward-link pointer, and should not be used inside
  AST_LIST_TRAVERSE() against the entry pointed to by the \a current pointer without
  careful consideration of their consequences:
  \li AST_LIST_NEXT() (when used as an lvalue)
  \li AST_LIST_INSERT_AFTER()
  \li AST_LIST_INSERT_HEAD()
  \li AST_LIST_INSERT_TAIL()
*/
#define AST_LIST_TRAVERSE(head,var,field) 				\
	for((var) = (head)->first; (var); (var) = (var)->field.next)

#define AST_RWLIST_TRAVERSE AST_LIST_TRAVERSE

/*!
  \brief Loops safely over (traverses) the entries in a list.
  \param head This is a pointer to the list head structure
  \param var This is the name of the variable that will hold a pointer to the
  current list entry on each iteration. It must be declared before calling
  this macro.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.

  This macro is used to safely loop over (traverse) the entries in a list. It
  uses a \a for loop, and supplies the enclosed code with a pointer to each list
  entry as it loops. It is typically used as follows:

  \code
  static AST_LIST_HEAD(entry_list, list_entry) entries;
  ...
  struct list_entry {
  	...
  	AST_LIST_ENTRY(list_entry) list;
  }
  ...
  struct list_entry *current;
  ...
  AST_LIST_TRAVERSE_SAFE_BEGIN(&entries, current, list) {
     (do something with current here)
  }
  AST_LIST_TRAVERSE_SAFE_END;
  \endcode

  It differs from AST_LIST_TRAVERSE() in that the code inside the loop can modify
  (or even free, after calling AST_LIST_REMOVE_CURRENT()) the entry pointed to by
  the \a current pointer without affecting the loop traversal.
*/
#define AST_LIST_TRAVERSE_SAFE_BEGIN(head, var, field) {				\
	typeof((head)->first) __list_next;						\
	typeof((head)->first) __list_prev = NULL;					\
	typeof((head)->first) __new_prev = NULL;					\
	for ((var) = (head)->first, __new_prev = (var),					\
	      __list_next = (var) ? (var)->field.next : NULL;				\
	     (var);									\
	     __list_prev = __new_prev, (var) = __list_next,				\
	     __new_prev = (var),							\
	     __list_next = (var) ? (var)->field.next : NULL				\
	    )

#define AST_RWLIST_TRAVERSE_SAFE_BEGIN AST_LIST_TRAVERSE_SAFE_BEGIN

/*!
  \brief Removes the \a current entry from a list during a traversal.
  \param head This is a pointer to the list head structure
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.

  \note This macro can \b only be used inside an AST_LIST_TRAVERSE_SAFE_BEGIN()
  block; it is used to unlink the current entry from the list without affecting
  the list traversal (and without having to re-traverse the list to modify the
  previous entry, if any).
 */
#define AST_LIST_REMOVE_CURRENT(head, field)						\
	__new_prev->field.next = NULL;							\
	__new_prev = __list_prev;							\
	if (__list_prev)								\
		__list_prev->field.next = __list_next;					\
	else										\
		(head)->first = __list_next;						\
	if (!__list_next)								\
		(head)->last = __list_prev;

#define AST_RWLIST_REMOVE_CURRENT AST_LIST_REMOVE_CURRENT

/*!
  \brief Inserts a list entry before the current entry during a traversal.
  \param head This is a pointer to the list head structure
  \param elm This is a pointer to the entry to be inserted.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.

  \note This macro can \b only be used inside an AST_LIST_TRAVERSE_SAFE_BEGIN()
  block.
 */
#define AST_LIST_INSERT_BEFORE_CURRENT(head, elm, field) do {		\
	if (__list_prev) {						\
		(elm)->field.next = __list_prev->field.next;		\
		__list_prev->field.next = elm;				\
	} else {							\
		(elm)->field.next = (head)->first;			\
		(head)->first = (elm);					\
	}								\
	__new_prev = (elm);						\
} while (0)

#define AST_RWLIST_INSERT_BEFORE_CURRENT AST_LIST_INSERT_BEFORE_CURRENT

/*!
  \brief Closes a safe loop traversal block.
 */
#define AST_LIST_TRAVERSE_SAFE_END  }

#define AST_RWLIST_TRAVERSE_SAFE_END AST_LIST_TRAVERSE_SAFE_END

/*!
  \brief Initializes a list head structure.
  \param head This is a pointer to the list head structure

  This macro initializes a list head structure by setting the head
  entry to \a NULL (empty list) and recreating the embedded lock.
*/
#define AST_LIST_HEAD_INIT(head) {					\
	(head)->first = NULL;						\
	(head)->last = NULL;						\
	ast_mutex_init(&(head)->lock);					\
}

/*!
  \brief Initializes an rwlist head structure.
  \param head This is a pointer to the list head structure

  This macro initializes a list head structure by setting the head
  entry to \a NULL (empty list) and recreating the embedded lock.
*/
#define AST_RWLIST_HEAD_INIT(head) {                                    \
        (head)->first = NULL;                                           \
        (head)->last = NULL;                                            \
        ast_rwlock_init(&(head)->lock);                                 \
}

/*!
  \brief Destroys a list head structure.
  \param head This is a pointer to the list head structure

  This macro destroys a list head structure by setting the head
  entry to \a NULL (empty list) and destroying the embedded lock.
  It does not free the structure from memory.
*/
#define AST_LIST_HEAD_DESTROY(head) {					\
	(head)->first = NULL;						\
	(head)->last = NULL;						\
	ast_mutex_destroy(&(head)->lock);				\
}

/*!
  \brief Destroys an rwlist head structure.
  \param head This is a pointer to the list head structure

  This macro destroys a list head structure by setting the head
  entry to \a NULL (empty list) and destroying the embedded lock.
  It does not free the structure from memory.
*/
#define AST_RWLIST_HEAD_DESTROY(head) {                                 \
        (head)->first = NULL;                                           \
        (head)->last = NULL;                                            \
        ast_rwlock_destroy(&(head)->lock);                              \
}

/*!
  \brief Initializes a list head structure.
  \param head This is a pointer to the list head structure

  This macro initializes a list head structure by setting the head
  entry to \a NULL (empty list). There is no embedded lock handling
  with this macro.
*/
#define AST_LIST_HEAD_INIT_NOLOCK(head) {				\
	(head)->first = NULL;						\
	(head)->last = NULL;						\
}

/*!
  \brief Inserts a list entry after a given entry.
  \param head This is a pointer to the list head structure
  \param listelm This is a pointer to the entry after which the new entry should
  be inserted.
  \param elm This is a pointer to the entry to be inserted.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.
 */
#define AST_LIST_INSERT_AFTER(head, listelm, elm, field) do {		\
	(elm)->field.next = (listelm)->field.next;			\
	(listelm)->field.next = (elm);					\
	if ((head)->last == (listelm))					\
		(head)->last = (elm);					\
} while (0)

#define AST_RWLIST_INSERT_AFTER AST_LIST_INSERT_AFTER

/*!
  \brief Inserts a list entry at the head of a list.
  \param head This is a pointer to the list head structure
  \param elm This is a pointer to the entry to be inserted.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.
 */
#define AST_LIST_INSERT_HEAD(head, elm, field) do {			\
		(elm)->field.next = (head)->first;			\
		(head)->first = (elm);					\
		if (!(head)->last)					\
			(head)->last = (elm);				\
} while (0)

#define AST_RWLIST_INSERT_HEAD AST_LIST_INSERT_HEAD

/*!
  \brief Appends a list entry to the tail of a list.
  \param head This is a pointer to the list head structure
  \param elm This is a pointer to the entry to be appended.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.

  Note: The link field in the appended entry is \b not modified, so if it is
  actually the head of a list itself, the entire list will be appended
  temporarily (until the next AST_LIST_INSERT_TAIL is performed).
 */
#define AST_LIST_INSERT_TAIL(head, elm, field) do {			\
      if (!(head)->first) {						\
		(head)->first = (elm);					\
		(head)->last = (elm);					\
      } else {								\
		(head)->last->field.next = (elm);			\
		(head)->last = (elm);					\
      }									\
} while (0)

#define AST_RWLIST_INSERT_TAIL AST_LIST_INSERT_TAIL

/*!
  \brief Appends a whole list to the tail of a list.
  \param head This is a pointer to the list head structure
  \param list This is a pointer to the list to be appended.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.
 */
#define AST_LIST_APPEND_LIST(head, list, field) do {			\
      if (!(head)->first) {						\
		(head)->first = (list)->first;				\
		(head)->last = (list)->last;				\
      } else {								\
		(head)->last->field.next = (list)->first;		\
		(head)->last = (list)->last;				\
      }									\
} while (0)

#define AST_RWLIST_APPEND_LIST AST_LIST_APPEND_LIST

/*!
  \brief Removes and returns the head entry from a list.
  \param head This is a pointer to the list head structure
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.

  Removes the head entry from the list, and returns a pointer to it.
  This macro is safe to call on an empty list.
 */
#define AST_LIST_REMOVE_HEAD(head, field) ({				\
		typeof((head)->first) cur = (head)->first;		\
		if (cur) {						\
			(head)->first = cur->field.next;		\
			cur->field.next = NULL;				\
			if ((head)->last == cur)			\
				(head)->last = NULL;			\
		}							\
		cur;							\
	})

#define AST_RWLIST_REMOVE_HEAD AST_LIST_REMOVE_HEAD

/*!
  \brief Removes a specific entry from a list.
  \param head This is a pointer to the list head structure
  \param elm This is a pointer to the entry to be removed.
  \param field This is the name of the field (declared using AST_LIST_ENTRY())
  used to link entries of this list together.
  \warning The removed entry is \b not freed nor modified in any way.
 */
#define AST_LIST_REMOVE(head, elm, field) do {			        \
	if ((head)->first == (elm)) {					\
		(head)->first = (elm)->field.next;			\
		if ((head)->last == (elm))			\
			(head)->last = NULL;			\
	} else {								\
		typeof(elm) curelm = (head)->first;			\
		while (curelm && (curelm->field.next != (elm)))			\
			curelm = curelm->field.next;			\
		if (curelm) { \
			curelm->field.next = (elm)->field.next;			\
			if ((head)->last == (elm))				\
				(head)->last = curelm;				\
		} \
	}								\
        (elm)->field.next = NULL;                                       \
} while (0)

#define AST_RWLIST_REMOVE AST_LIST_REMOVE

/* chanvars.h */

struct ast_var_t {
	AST_LIST_ENTRY(ast_var_t) entries;
	char *value;
	char name[0];
};

AST_LIST_HEAD_NOLOCK(varshead, ast_var_t);

AST_RWLOCK_DEFINE_STATIC(globalslock);
static struct varshead globals = AST_LIST_HEAD_NOLOCK_INIT_VALUE;


/* IN CONFLICT: struct ast_var_t *ast_var_assign(const char *name, const char *value); */

static struct ast_var_t *ast_var_assign(const char *name, const char *value);

static void ast_var_delete(struct ast_var_t *var);

/*from channel.h */
#define AST_MAX_EXTENSION  80      /*!< Max length of an extension */


/* from pbx.h */
#define PRIORITY_HINT	-1	/*!< Special Priority for a hint */

enum ast_extension_states {
	AST_EXTENSION_REMOVED = -2,	/*!< Extension removed */
	AST_EXTENSION_DEACTIVATED = -1,	/*!< Extension hint removed */
	AST_EXTENSION_NOT_INUSE = 0,	/*!< No device INUSE or BUSY  */
	AST_EXTENSION_INUSE = 1 << 0,	/*!< One or more devices INUSE */
	AST_EXTENSION_BUSY = 1 << 1,	/*!< All devices BUSY */
	AST_EXTENSION_UNAVAILABLE = 1 << 2, /*!< All devices UNAVAILABLE/UNREGISTERED */
	AST_EXTENSION_RINGING = 1 << 3,	/*!< All devices RINGING */
	AST_EXTENSION_ONHOLD = 1 << 4,	/*!< All devices ONHOLD */
};

struct ast_custom_function {
	const char *name;		/*!< Name */
	const char *synopsis;		/*!< Short description for "show functions" */
	const char *desc;		/*!< Help text that explains it all */
	const char *syntax;		/*!< Syntax description */
	int (*read)(struct ast_channel *, const char *, char *, char *, size_t);	/*!< Read function, if read is supported */
	int (*write)(struct ast_channel *, const char *, char *, const char *);		/*!< Write function, if write is supported */
	AST_RWLIST_ENTRY(ast_custom_function) acflist;
};

typedef int (ast_switch_f)(struct ast_channel *chan, const char *context,
	const char *exten, int priority, const char *callerid, const char *data);

struct ast_switch {
	AST_LIST_ENTRY(ast_switch) list;
	const char *name;			/*!< Name of the switch */
	const char *description;		/*!< Description of the switch */
	
	ast_switch_f *exists;
	ast_switch_f *canmatch;
	ast_switch_f *exec;
	ast_switch_f *matchmore;
};


static char *config_filename = "extensions.conf";
static char *global_registrar = "conf2ael";
static char userscontext[AST_MAX_EXTENSION] = "default";
static int static_config = 0;
static int write_protect_config = 1;
static int autofallthrough_config = 0;
static int clearglobalvars_config = 0;
/*! Go no deeper than this through includes (not counting loops) */
#define AST_PBX_MAX_STACK	128
static void pbx_substitute_variables_helper(struct ast_channel *c,const char *cp1,char *cp2,int count);


/* stolen from callerid.c */

/*! \brief Clean up phone string
 * remove '(', ' ', ')', non-trailing '.', and '-' not in square brackets.
 * Basically, remove anything that could be invalid in a pattern.
 */
static void ast_shrink_phone_number(char *n)
{
	int x, y=0;
	int bracketed = 0;

	for (x=0; n[x]; x++) {
		switch(n[x]) {
		case '[':
			bracketed++;
			n[y++] = n[x];
			break;
		case ']':
			bracketed--;
			n[y++] = n[x];
			break;
		case '-':
			if (bracketed)
				n[y++] = n[x];
			break;
		case '.':
			if (!n[x+1])
				n[y++] = n[x];
			break;
		default:
			if (!strchr("()", n[x]))
				n[y++] = n[x];
		}
	}
	n[y] = '\0';
}


/* stolen from chanvars.c */

static const char *ast_var_name(const struct ast_var_t *var)
{
	const char *name;

	if (var == NULL || (name = var->name) == NULL)
		return NULL;
	/* Return the name without the initial underscores */
	if (name[0] == '_') {
		name++;
		if (name[0] == '_')
			name++;
	}
	return name;
}

/* experiment 1: see if it's easier just to use existing config code
 *               to read in the extensions.conf file. In this scenario, 
                 I have to rip/copy code from other modules, because they
                 are staticly declared as-is. A solution would be to move
                 the ripped code to another location and make them available
                 to other modules and standalones */

/* Our own version of ast_log, since the expr parser uses it. -- stolen from utils/check_expr.c */

static void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...)
{
	va_list vars;
	va_start(vars,fmt);
	
	printf("LOG: lev:%d file:%s  line:%d func: %s  ",
		   level, file, line, function);
	vprintf(fmt, vars);
	fflush(stdout);
	va_end(vars);
}

void __attribute__((format(printf, 1, 2))) ast_verbose(const char *fmt, ...)
{
	va_list vars;
	va_start(vars,fmt);
	
	printf("VERBOSE: ");
	vprintf(fmt, vars);
	fflush(stdout);
	va_end(vars);
}

/* stolen from main/utils.c */
static char *ast_process_quotes_and_slashes(char *start, char find, char replace_with)
{
 	char *dataPut = start;
	int inEscape = 0;
	int inQuotes = 0;

	for (; *start; start++) {
		if (inEscape) {
			*dataPut++ = *start;       /* Always goes verbatim */
			inEscape = 0;
		} else {
			if (*start == '\\') {
				inEscape = 1;      /* Do not copy \ into the data */
			} else if (*start == '\'') {
				inQuotes = 1 - inQuotes;   /* Do not copy ' into the data */
			} else {
				/* Replace , with |, unless in quotes */
				*dataPut++ = inQuotes ? *start : ((*start == find) ? replace_with : *start);
			}
		}
	}
	if (start != dataPut)
		*dataPut = 0;
	return dataPut;
}

static int ast_true(const char *s)
{
	if (ast_strlen_zero(s))
		return 0;

	/* Determine if this is a true value */
	if (!strcasecmp(s, "yes") ||
	    !strcasecmp(s, "true") ||
	    !strcasecmp(s, "y") ||
	    !strcasecmp(s, "t") ||
	    !strcasecmp(s, "1") ||
	    !strcasecmp(s, "on"))
		return -1;

	return 0;
}

#define ONE_MILLION	1000000
/*
 * put timeval in a valid range. usec is 0..999999
 * negative values are not allowed and truncated.
 */
static struct timeval tvfix(struct timeval a)
{
	if (a.tv_usec >= ONE_MILLION) {
		ast_log(LOG_WARNING, "warning too large timestamp %ld.%ld\n",
			(long)a.tv_sec, (long int) a.tv_usec);
		a.tv_sec += a.tv_usec / ONE_MILLION;
		a.tv_usec %= ONE_MILLION;
	} else if (a.tv_usec < 0) {
		ast_log(LOG_WARNING, "warning negative timestamp %ld.%ld\n",
			(long)a.tv_sec, (long int) a.tv_usec);
		a.tv_usec = 0;
	}
	return a;
}

struct timeval ast_tvadd(struct timeval a, struct timeval b);
struct timeval ast_tvadd(struct timeval a, struct timeval b)
{
	/* consistency checks to guarantee usec in 0..999999 */
	a = tvfix(a);
	b = tvfix(b);
	a.tv_sec += b.tv_sec;
	a.tv_usec += b.tv_usec;
	if (a.tv_usec >= ONE_MILLION) {
		a.tv_sec++;
		a.tv_usec -= ONE_MILLION;
	}
	return a;
}

struct timeval ast_tvsub(struct timeval a, struct timeval b);
struct timeval ast_tvsub(struct timeval a, struct timeval b)
{
	/* consistency checks to guarantee usec in 0..999999 */
	a = tvfix(a);
	b = tvfix(b);
	a.tv_sec -= b.tv_sec;
	a.tv_usec -= b.tv_usec;
	if (a.tv_usec < 0) {
		a.tv_sec-- ;
		a.tv_usec += ONE_MILLION;
	}
	return a;
}
#undef ONE_MILLION

void ast_mark_lock_failed(void *lock_addr);
void ast_mark_lock_failed(void *lock_addr)
{
	/* Pretend to do something. */
}

/* stolen from pbx.c */
#define VAR_BUF_SIZE 4096

#define	VAR_NORMAL		1
#define	VAR_SOFTTRAN	2
#define	VAR_HARDTRAN	3

#define BACKGROUND_SKIP		(1 << 0)
#define BACKGROUND_NOANSWER	(1 << 1)
#define BACKGROUND_MATCHEXTEN	(1 << 2)
#define BACKGROUND_PLAYBACK	(1 << 3)

/*!
   \brief ast_exten: An extension
	The dialplan is saved as a linked list with each context
	having it's own linked list of extensions - one item per
	priority.
*/
struct ast_exten {
	char *exten;			/*!< Extension name */
	int matchcid;			/*!< Match caller id ? */
	const char *cidmatch;		/*!< Caller id to match for this extension */
	int priority;			/*!< Priority */
	const char *label;		/*!< Label */
	struct ast_context *parent;	/*!< The context this extension belongs to  */
	const char *app; 		/*!< Application to execute */
	struct ast_app *cached_app;     /*!< Cached location of application */
	void *data;			/*!< Data to use (arguments) */
	void (*datad)(void *);		/*!< Data destructor */
	struct ast_exten *peer;		/*!< Next higher priority with our extension */
	const char *registrar;		/*!< Registrar */
	struct ast_exten *next;		/*!< Extension with a greater ID */
	char stuff[0];
};
/* from pbx.h */
typedef int (*ast_state_cb_type)(char *context, char* id, enum ast_extension_states state, void *data);
struct ast_timing {
	int hastime;				/*!< If time construct exists */
	unsigned int monthmask;			/*!< Mask for month */
	unsigned int daymask;			/*!< Mask for date */
	unsigned int dowmask;			/*!< Mask for day of week (mon-sun) */
	unsigned int minmask[48];		/*!< Mask for minute */
	char *timezone;                 /*!< NULL, or zoneinfo style timezone */
};
/* end of pbx.h */
/*! \brief ast_include: include= support in extensions.conf */
struct ast_include {
	const char *name;
	const char *rname;			/*!< Context to include */
	const char *registrar;			/*!< Registrar */
	int hastime;				/*!< If time construct exists */
	struct ast_timing timing;               /*!< time construct */
	struct ast_include *next;		/*!< Link them together */
	char stuff[0];
};

/*! \brief ast_sw: Switch statement in extensions.conf */
struct ast_sw {
	char *name;
	const char *registrar;			/*!< Registrar */
	char *data;				/*!< Data load */
	int eval;
	AST_LIST_ENTRY(ast_sw) list;
	char *tmpdata;
	char stuff[0];
};

/*! \brief ast_ignorepat: Ignore patterns in dial plan */
struct ast_ignorepat {
	const char *registrar;
	struct ast_ignorepat *next;
	char pattern[0];
};

/*! \brief ast_context: An extension context */
struct ast_context {
	ast_rwlock_t lock; 			/*!< A lock to prevent multiple threads from clobbering the context */
	struct ast_exten *root;			/*!< The root of the list of extensions */
	struct ast_context *next;		/*!< Link them together */
	struct ast_include *includes;		/*!< Include other contexts */
	struct ast_ignorepat *ignorepats;	/*!< Patterns for which to continue playing dialtone */
	const char *registrar;			/*!< Registrar */
	AST_LIST_HEAD_NOLOCK(, ast_sw) alts;	/*!< Alternative switches */
	ast_mutex_t macrolock;			/*!< A lock to implement "exclusive" macros - held whilst a call is executing in the macro */
	char name[0];				/*!< Name of the context */
};


/*! \brief ast_app: A registered application */
struct ast_app {
	int (*execute)(struct ast_channel *chan, void *data);
	const char *synopsis;			/*!< Synopsis text for 'show applications' */
	const char *description;		/*!< Description (help text) for 'show application &lt;name&gt;' */
	AST_RWLIST_ENTRY(ast_app) list;		/*!< Next app in list */
	void *module;			/*!< Module this app belongs to */
	char name[0];				/*!< Name of the application */
};


/*! \brief ast_state_cb: An extension state notify register item */
struct ast_state_cb {
	int id;
	void *data;
	ast_state_cb_type callback;
	struct ast_state_cb *next;
};

/*! \brief Structure for dial plan hints

  \note Hints are pointers from an extension in the dialplan to one or
  more devices (tech/name) 
	- See \ref AstExtState
*/
struct ast_hint {
	struct ast_exten *exten;	/*!< Extension */
	int laststate; 			/*!< Last known state */
	struct ast_state_cb *callbacks;	/*!< Callback list for this extension */
	AST_RWLIST_ENTRY(ast_hint) list;/*!< Pointer to next hint in list */
};

struct store_hint {
	char *context;
	char *exten;
	struct ast_state_cb *callbacks;
	int laststate;
	AST_LIST_ENTRY(store_hint) list;
	char data[1];
};