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strlst.h
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#ifndef footxtlisthfoo
#define footxtlisthfoo
/***
This file is part of avahi.
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
avahi 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 Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
/** \file strlst.h Implementation of a data type to store lists of strings */
#include <sys/types.h>
#include <inttypes.h>
#include <stdarg.h>
#include <avahi-common/cdecl.h>
#include <avahi-common/gccmacro.h>
AVAHI_C_DECL_BEGIN
/** Linked list of strings that can contain any number of binary
* characters, including NUL bytes. An empty list is created by
* assigning a NULL to a pointer to AvahiStringList. The string list
* is stored in reverse order, so that appending to the string list is
* effectively a prepending to the linked list. This object is used
* primarily for storing DNS TXT record data. */
typedef struct AvahiStringList {
struct AvahiStringList *next; /**< Pointer to the next linked list element */
size_t size; /**< Size of text[] */
uint8_t text[1]; /**< Character data */
} AvahiStringList;
/** @{ \name Construction and destruction */
/** Create a new string list by taking a variable list of NUL
* terminated strings. The strings are copied using g_strdup(). The
* argument list must be terminated by a NULL pointer. */
AvahiStringList *avahi_string_list_new(const char *txt, ...) AVAHI_GCC_SENTINEL;
/** \cond fulldocs */
/** Same as avahi_string_list_new() but pass a va_list structure */
AvahiStringList *avahi_string_list_new_va(va_list va);
/** \endcond */
/** Create a new string list from a string array. The strings are
* copied using g_strdup(). length should contain the length of the
* array, or -1 if the array is NULL terminated*/
AvahiStringList *avahi_string_list_new_from_array(const char **array, int length);
/** Free a string list */
void avahi_string_list_free(AvahiStringList *l);
/** @} */
/** @{ \name Adding strings */
/** Append a NUL terminated string to the specified string list. The
* passed string is copied using g_strdup(). Returns the new list
* start. */
AvahiStringList *avahi_string_list_add(AvahiStringList *l, const char *text);
/** Append a new NUL terminated formatted string to the specified string list */
AvahiStringList *avahi_string_list_add_printf(AvahiStringList *l, const char *format, ...) AVAHI_GCC_PRINTF_ATTR23;
/** \cond fulldocs */
/** Append a new NUL terminated formatted string to the specified string list */
AvahiStringList *avahi_string_list_add_vprintf(AvahiStringList *l, const char *format, va_list va);
/** \endcond */
/** Append an arbitrary length byte string to the list. Returns the
* new list start. */
AvahiStringList *avahi_string_list_add_arbitrary(AvahiStringList *l, const uint8_t *text, size_t size);
/** Append a new entry to the string list. The string is not filled
with data. The caller should fill in string data afterwards by writing
it to l->text, where l is the pointer returned by this function. This
function exists solely to optimize a few operations where otherwise
superfluous string copying would be necessary. */
AvahiStringList*avahi_string_list_add_anonymous(AvahiStringList *l, size_t size);
/** Same as avahi_string_list_add(), but takes a variable number of
* NUL terminated strings. The argument list must be terminated by a
* NULL pointer. Returns the new list start. */
AvahiStringList *avahi_string_list_add_many(AvahiStringList *r, ...) AVAHI_GCC_SENTINEL;
/** \cond fulldocs */
/** Same as avahi_string_list_add_many(), but use a va_list
* structure. Returns the new list start. */
AvahiStringList *avahi_string_list_add_many_va(AvahiStringList *r, va_list va);
/** \endcond */
/** @} */
/** @{ \name String list operations */
/** Convert the string list object to a single character string,
* seperated by spaces and enclosed in "". avahi_free() the result! This
* function doesn't work well with strings that contain NUL bytes. */
char* avahi_string_list_to_string(AvahiStringList *l);
/** \cond fulldocs */
/** Serialize the string list object in a way that is compatible with
* the storing of DNS TXT records. Strings longer than 255 bytes are truncated. */
size_t avahi_string_list_serialize(AvahiStringList *l, void * data, size_t size);
/** Inverse of avahi_string_list_serialize() */
int avahi_string_list_parse(const void *data, size_t size, AvahiStringList **ret);
/** \endcond */
/** Compare to string lists */
int avahi_string_list_equal(const AvahiStringList *a, const AvahiStringList *b);
/** Copy a string list */
AvahiStringList *avahi_string_list_copy(const AvahiStringList *l);
/** Reverse the string list. */
AvahiStringList* avahi_string_list_reverse(AvahiStringList *l);
/** Return the number of elements in the string list */
unsigned avahi_string_list_length(const AvahiStringList *l);
/** @} */
/** @{ \name Accessing items */
/** Returns the next item in the string list */
AvahiStringList *avahi_string_list_get_next(AvahiStringList *l);
/** Returns the text for the current item */
uint8_t *avahi_string_list_get_text(AvahiStringList *l);
/** Returns the size of the current text */
size_t avahi_string_list_get_size(AvahiStringList *l);
/** @} */
/** @{ \name DNS-SD TXT pair handling */
/** Find the string list entry for the given DNS-SD TXT key */
AvahiStringList *avahi_string_list_find(AvahiStringList *l, const char *key);
/** Return the DNS-SD TXT key and value for the specified string list
* item. If size is not NULL it will be filled with the length of
* value. (for strings containing NUL bytes). If the entry doesn't
* contain a value *value will be set to NULL. You need to
* avahi_free() the strings returned in *key and *value. */
int avahi_string_list_get_pair(AvahiStringList *l, char **key, char **value, size_t *size);
/** Add a new DNS-SD TXT key value pair to the string list. value may
* be NULL in case you want to specify a key without a value */
AvahiStringList *avahi_string_list_add_pair(AvahiStringList *l, const char *key, const char *value);
/** Same as avahi_string_list_add_pair() but allow strings containing NUL bytes in *value. */
AvahiStringList *avahi_string_list_add_pair_arbitrary(AvahiStringList *l, const char *key, const uint8_t *value, size_t size);
/** @} */
/** \cond fulldocs */
/** Try to find a magic service cookie in the specified DNS-SD string
* list. Or return AVAHI_SERVICE_COOKIE_INVALID if none is found. */
uint32_t avahi_string_list_get_service_cookie(AvahiStringList *l);
/** \endcond */
AVAHI_C_DECL_END
#endif