NAME

       layout.h -

       Interface for user specific layout format of log4c_logging_event events.

SYNOPSIS

       #include <log4c/defs.h>
       #include <log4c/logging_event.h>
       #include <stdio.h>

   Data Structures
       struct log4c_layout_type
           log4c layout type class

   Defines
       #define log4c_layout_type_define(a_type)

   Typedefs
       typedef struct __log4c_layout log4c_layout_t
       typedef struct log4c_layout_type log4c_layout_type_t
           log4c layout type class

   Functions
       LOG4C_API const log4c_layout_type_t * log4c_layout_type_get (const char *a_name)
       LOG4C_API const log4c_layout_type_t * log4c_layout_type_set (const log4c_layout_type_t
           *a_type)
       LOG4C_API log4c_layout_t * log4c_layout_get (const char *a_name)
       LOG4C_API log4c_layout_t * log4c_layout_new (const char *a_name)
       LOG4C_API void log4c_layout_delete (log4c_layout_t *a_layout)
       LOG4C_API const char * log4c_layout_get_name (const log4c_layout_t *a_layout)
       LOG4C_API const log4c_layout_type_t * log4c_layout_get_type (const log4c_layout_t
           *a_layout)
       LOG4C_API const log4c_layout_type_t * log4c_layout_set_type (log4c_layout_t *a_layout,
           const log4c_layout_type_t *a_type)
       LOG4C_API void * log4c_layout_get_udata (const log4c_layout_t *a_layout)
       LOG4C_API void * log4c_layout_set_udata (log4c_layout_t *a_layout, void *a_udata)
       LOG4C_API const char * log4c_layout_format (const log4c_layout_t *a_layout, const
           log4c_logging_event_t *a_event)
       LOG4C_API void log4c_layout_print (const log4c_layout_t *a_layout, FILE *a_stream)
       LOG4C_API void log4c_layout_types_print (FILE *fp)

Detailed Description

       Interface for user specific layout format of log4c_logging_event events.

       Todo
           the layout interface needs a better configuration system depending on the layout type.
           The udata field is a just a trick.

       Todo
           a pattern layout would be welcomed !!

Define Documentation

   #define log4c_layout_type_define(a_type) Helper macro to define static layout types.
       Parameters:
           a_type the log4c_layout_type_t object to define

       Warning:
           needs GCC support: otherwise this macro does nothing

       Deprecated
           This macro, and the static initialialization of layouts in general, is deprecated. Use
           rather the log4c_layout_type_set() function to initialize your appenders before
           calling log4c_init()

Typedef Documentation

   typedef struct __log4c_layout log4c_layout_t log4c layout class
   typedef struct log4c_layout_type  log4c_layout_type_t
       log4c layout type class Attributes description:

       • name layout type name
       • format

Function Documentation

   LOG4C_API void log4c_layout_delete (log4c_layout_t *a_layout) Destructor for layout.
   LOG4C_API const char* log4c_layout_format (const log4c_layout_t *a_layout, const
       log4c_logging_event_t *a_event) format a log4c_logging_event events to a string.
       Parameters:
           a_layout the log4c_layout_t object
           a_event a logging_event_t object
       Returns:
           an appendable string.
   LOG4C_API log4c_layout_t* log4c_layout_get (const char *a_name) Get a pointer to an existing
       layout.
       Parameters:
           a_name the name of the layout to return.
       Returns:
           a pointer to an existing layout, or NULL if no layout with the specfied name exists.
   LOG4C_API const char* log4c_layout_get_name (const log4c_layout_t *a_layout) Parameters:
           a_layout the log4c_layout_t object
       Returns:
           the layout name
   LOG4C_API const log4c_layout_type_t* log4c_layout_get_type (const log4c_layout_t *a_layout)
       Parameters:
           a_layout the log4c_layout_t object
       Returns:
           a log4c_layout_type_t object
   LOG4C_API void* log4c_layout_get_udata (const log4c_layout_t *a_layout) Parameters:
           a_layout the log4c_layout_t object
       Returns:
           the layout user data
   LOG4C_API log4c_layout_t* log4c_layout_new (const char *a_name) Constructor for layout.
   LOG4C_API void log4c_layout_print (const log4c_layout_t *a_layout, FILE *a_stream) prints the
       layout on a stream
       Parameters:
           a_layout the log4c_layout_t object
           a_stream the stream
   LOG4C_API const log4c_layout_type_t* log4c_layout_set_type (log4c_layout_t *a_layout, const
       log4c_layout_type_t *a_type) sets the layout type
       Parameters:
           a_layout the log4c_layout_t object
           a_type the new layout type
       Returns:
           the previous layout type
   LOG4C_API void* log4c_layout_set_udata (log4c_layout_t *a_layout, void *a_udata) sets the
       layout user data
       Parameters:
           a_layout the log4c_layout_t object
           a_udata the new layout user data
       Returns:
           the previous layout user data
   LOG4C_API const log4c_layout_type_t* log4c_layout_type_get (const char *a_name) Get a pointer
       to an existing layout type.
       Parameters:
           a_name the name of the layout type to return.
       Returns:
           a pointer to an existing layout type, or NULL if no layout type with the specified
           name exists.
   LOG4C_API const log4c_layout_type_t* log4c_layout_type_set (const log4c_layout_type_t *a_type)
       Use this function to register a layout type with log4c. Once this is done you may refer to
       this type by name both programatically and in the log4c configuration file.
       Parameters:
           a_type a pointer to the new layout type to set.
       Returns:
           a pointer to the previous layout type of same name.
       Example code fragment:
        const log4c_layout_type_t log4c_layout_type_xml = {
           's13_xml',
           xml_format,
        };

        log4c_layout_type_set(&log4c_layout_type_xml);

   LOG4C_API void log4c_layout_types_print (FILE *fp) prints all the current registered layout
       types on a stream
       Parameters:
           fp the stream

Author

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