f0fedd9746
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4809 a95241bf-73f2-0310-859d-f6bbb57e9c96
98 lines
3.8 KiB
C
98 lines
3.8 KiB
C
/*******************************************************************************
|
|
/
|
|
/ File: atomizer.h
|
|
/
|
|
/ Description: Kernel atomizer module API
|
|
/
|
|
/ Copyright 1999, Be Incorporated, All Rights Reserved.
|
|
/
|
|
*******************************************************************************/
|
|
|
|
#ifndef _ATOMIZER_MODULE_H_
|
|
#define _ATOMIZER_MODULE_H_
|
|
|
|
#include <module.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
An atomizer is a software device that returns a unique token for a
|
|
null-terminated UTF8 string.
|
|
|
|
Each atomizer comprises a separate token space. The same string interned
|
|
in two different atomizers will generate two distinct tokens.
|
|
|
|
Atomizers and the tokens they generate are only guaranteed valid between
|
|
matched calls to get_module/put_module.
|
|
|
|
void * find_or_make_atomizer(const char *string)
|
|
Returns a token that identifies the named atomizer, creating a new
|
|
atomizer if the named atomizer does not exist. Pass null, a zero
|
|
length string, or the value B_SYSTEM_ATOMIZER_NAME for string will
|
|
return a pointer to the system atomizer. Returns (void *)(0)
|
|
if the atomizer could not be created (for whatever reason). A return
|
|
value of (void *)(-1) refers to the system atomizer.
|
|
|
|
status_t delete_atomizer(void *atomizer)
|
|
Delete the atomizer specified. Returns B_OK if successfull, B_ERROR
|
|
otherwise. An error return usually means that a race condition was
|
|
detected while destroying the atomizer.
|
|
|
|
void * atomize(void *atomizer, const char *string, int create)
|
|
Return the unique token for the specified string, creating a new token
|
|
if the string was not previously atomized and create is non-zero. If
|
|
atomizer is (void *)(-1), use the system atomizer (saving the step of
|
|
looking it up with find_or_make_atomizer(). Returns (const char *)(0)
|
|
if there were any errors detected: insufficient memory or a race
|
|
condition with someone deleting the atomizer.
|
|
|
|
const char * string_for_token(void *atomizer, void *atom)
|
|
Return a pointer to the string described by atom in the provided atomizer.
|
|
Returns (const char *)(0) if either the atomizer or the atom were invalid.
|
|
|
|
status_t get_next_atomizer_info(void **cookie, atomizer_info *info)
|
|
Returns info about the next atomizer in the list of atomizers by modifying
|
|
the contents of info. The pointer specified by *cookie should be set to
|
|
(void *)(0) to retrieve the first atomizer, and should not be modified
|
|
thereafter. Returns B_ERROR when there are no more atomizers.
|
|
Adding or deleting atomizers between calls to get_next_atomizer() results
|
|
in a safe but undefined behavior.
|
|
|
|
void * get_next_atom(void *atomizer, uint32 *cookie)
|
|
Returns the next atom interned in specified atomizer, *cookie
|
|
should be set to (uint32)(0) to get the first atom. Returns
|
|
(void *)(0) when there are no more atoms. Adding atoms between
|
|
calls to get_next_atom() may cause atoms to be skipped.
|
|
|
|
Atomizers are SMP-safe. Check return codes for errors!
|
|
|
|
*/
|
|
|
|
#define B_ATOMIZER_MODULE_NAME "generic/atomizer/v1"
|
|
#define B_SYSTEM_ATOMIZER_NAME "BeOS System Atomizer"
|
|
|
|
typedef struct {
|
|
void *atomizer; /* An opaque token representing the atomizer. */
|
|
char name[B_OS_NAME_LENGTH]; /* The first B_OS_NAME_LENGTH bytes of the atomizer name, null terminated. */
|
|
uint32 atom_count; /* The number of atoms currently interned in this atomizer. */
|
|
} atomizer_info;
|
|
|
|
typedef struct {
|
|
module_info minfo;
|
|
const void * (*find_or_make_atomizer)(const char *string);
|
|
status_t (*delete_atomizer)(const void *atomizer);
|
|
const void * (*atomize)(const void *atomizer, const char *string, int create);
|
|
const char * (*string_for_token)(const void * atomizer, const void *atom);
|
|
status_t (*get_next_atomizer_info)(void **cookie, atomizer_info *info);
|
|
const void * (*get_next_atom)(const void *atomizer, uint32 *cookie);
|
|
} atomizer_module_info;
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|