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/*
signals.c : irssi
Copyright (C) 1999 Timo Sirainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "../common.h"
#include "signals.h"
#include "modules.h"
#define SIGNAL_LISTS 3
typedef struct {
int id; /* signal id */
int emitting; /* signal is being emitted */
int altered; /* some signal functions are marked as NULL */
int stop_emit; /* this signal was stopped */
GPtrArray *modulelist[SIGNAL_LISTS]; /* list of what signals belong
to which module */
GPtrArray *siglist[SIGNAL_LISTS]; /* signal lists */
} SIGNAL_REC;
#define signal_is_emitlist_empty(a) \
(!(a)->siglist[0] && !(a)->siglist[1] && !(a)->siglist[2])
static GMemChunk *signals_chunk;
static GHashTable *signals;
static SIGNAL_REC *current_emitted_signal;
void signal_add_to(const char *module, int pos,
const char *signal, SIGNAL_FUNC func)
{
g_return_if_fail(signal != NULL);
signal_add_to_id(module, pos, signal_get_uniq_id(signal), func);
}
/* bind a signal */
void signal_add_to_id(const char *module, int pos,
int signal_id, SIGNAL_FUNC func)
{
SIGNAL_REC *rec;
g_return_if_fail(signal_id >= 0);
g_return_if_fail(func != NULL);
g_return_if_fail(pos >= 0 && pos < SIGNAL_LISTS);
rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
if (rec == NULL) {
rec = g_mem_chunk_alloc0(signals_chunk);
rec->id = signal_id;
g_hash_table_insert(signals, GINT_TO_POINTER(signal_id), rec);
}
if (rec->siglist[pos] == NULL) {
rec->siglist[pos] = g_ptr_array_new();
rec->modulelist[pos] = g_ptr_array_new();
}
g_ptr_array_add(rec->siglist[pos], (void *) func);
g_ptr_array_add(rec->modulelist[pos], (void *) module);
}
/* Destroy the whole signal */
static void signal_destroy(int signal_id)
{
SIGNAL_REC *rec;
rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
if (rec != NULL) {
/* remove whole signal from memory */
g_hash_table_remove(signals, GINT_TO_POINTER(signal_id));
g_free(rec);
}
}
static int signal_list_find(GPtrArray *array, void *data)
{
unsigned int n;
for (n = 0; n < array->len; n++) {
if (g_ptr_array_index(array, n) == data)
return n;
}
return -1;
}
static void signal_remove_from_list(SIGNAL_REC *rec, int signal_id,
int list, int index)
{
if (rec->emitting) {
g_ptr_array_index(rec->siglist[list], index) = NULL;
rec->altered = TRUE;
} else {
g_ptr_array_remove_index(rec->siglist[list], index);
g_ptr_array_remove_index(rec->modulelist[list], index);
if (signal_is_emitlist_empty(rec))
signal_destroy(signal_id);
}
}
/* Remove signal from emit lists */
static int signal_remove_from_lists(SIGNAL_REC *rec, int signal_id,
SIGNAL_FUNC func)
{
int n, index;
for (n = 0; n < SIGNAL_LISTS; n++) {
if (rec->siglist[n] == NULL)
continue;
index = signal_list_find(rec->siglist[n], (void *) func);
if (index != -1) {
/* remove the function from emit list */
signal_remove_from_list(rec, signal_id, n, index);
return 1;
}
}
return 0;
}
void signal_remove_id(int signal_id, SIGNAL_FUNC func)
{
SIGNAL_REC *rec;
g_return_if_fail(signal_id >= 0);
g_return_if_fail(func != NULL);
rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
if (rec != NULL)
signal_remove_from_lists(rec, signal_id, func);
}
/* unbind signal */
void signal_remove(const char *signal, SIGNAL_FUNC func)
{
g_return_if_fail(signal != NULL);
signal_remove_id(signal_get_uniq_id(signal), func);
}
/* Remove all NULL functions from signal list */
static void signal_list_clean(SIGNAL_REC *rec)
{
int n, index;
for (n = 0; n < SIGNAL_LISTS; n++) {
if (rec->siglist[n] == NULL)
continue;
for (index = rec->siglist[n]->len-1; index >= 0; index--) {
if (g_ptr_array_index(rec->siglist[n], index) == NULL) {
g_ptr_array_remove_index(rec->siglist[n], index);
g_ptr_array_remove_index(rec->modulelist[n], index);
}
}
}
}
static int signal_emit_real(SIGNAL_REC *rec, gconstpointer *arglist)
{
SIGNAL_REC *prev_emitted_signal;
SIGNAL_FUNC func;
int n, index, stopped, stop_emit_count;
/* signal_stop_by_name("signal"); signal_emit("signal", ...);
fails if we compare rec->stop_emit against 0. */
stop_emit_count = rec->stop_emit;
stopped = FALSE;
rec->emitting++;
for (n = 0; n < SIGNAL_LISTS; n++) {
/* run signals in emit lists */
if (rec->siglist[n] == NULL)
continue;
for (index = rec->siglist[n]->len-1; index >= 0; index--) {
func = (SIGNAL_FUNC) g_ptr_array_index(rec->siglist[n], index);
if (func != NULL) {
prev_emitted_signal = current_emitted_signal;
current_emitted_signal = rec;
#if SIGNAL_MAX_ARGUMENTS != 6
# error SIGNAL_MAX_ARGS changed - update code
#endif
func(arglist[0], arglist[1], arglist[2], arglist[3], arglist[4], arglist[5]);
current_emitted_signal = prev_emitted_signal;
}
if (rec->stop_emit != stop_emit_count) {
stopped = TRUE;
rec->stop_emit--;
n = SIGNAL_LISTS;
break;
}
}
}
rec->emitting--;
if (!rec->emitting) {
if (rec->stop_emit != 0) {
/* signal_stop() used too many times */
rec->stop_emit = 0;
}
if (rec->altered) {
signal_list_clean(rec);
rec->altered = FALSE;
}
}
return stopped;
}
static int signal_emitv_id(int signal_id, int params, va_list va)
{
gconstpointer arglist[SIGNAL_MAX_ARGUMENTS];
SIGNAL_REC *rec;
int n;
g_return_val_if_fail(signal_id >= 0, FALSE);
g_return_val_if_fail(params >= 0 && params <= SIGNAL_MAX_ARGUMENTS, FALSE);
for (n = 0; n < SIGNAL_MAX_ARGUMENTS; n++)
arglist[n] = n > params ? NULL : va_arg(va, gconstpointer);
rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
if (rec != NULL && signal_emit_real(rec, arglist))
return TRUE;
return rec != NULL;
}
int signal_emit(const char *signal, int params, ...)
{
va_list va;
int signal_id, ret;
/* get arguments */
signal_id = signal_get_uniq_id(signal);
va_start(va, params);
ret = signal_emitv_id(signal_id, params, va);
va_end(va);
return ret;
}
int signal_emit_id(int signal_id, int params, ...)
{
va_list va;
int ret;
/* get arguments */
va_start(va, params);
ret = signal_emitv_id(signal_id, params, va);
va_end(va);
return ret;
}
/* stop the current ongoing signal emission */
void signal_stop(void)
{
SIGNAL_REC *rec;
rec = current_emitted_signal;
if (rec == NULL || rec->emitting <= rec->stop_emit)
g_warning("signal_stop() : no signals are being emitted currently");
else
rec->stop_emit++;
}
/* stop ongoing signal emission by signal name */
void signal_stop_by_name(const char *signal)
{
SIGNAL_REC *rec;
int signal_id;
signal_id = signal_get_uniq_id(signal);
rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
if (rec == NULL)
g_warning("signal_stop_by_name() : unknown signal \"%s\"", signal);
else if (rec->emitting <= rec->stop_emit)
g_warning("signal_stop_by_name() : signal \"%s\" not being emitted", signal);
else
rec->stop_emit++;
}
/* return the name of the signal that is currently being emitted */
const char *signal_get_emitted(void)
{
return signal_get_id_str(signal_get_emitted_id());
}
/* return the ID of the signal that is currently being emitted */
int signal_get_emitted_id(void)
{
SIGNAL_REC *rec;
rec = current_emitted_signal;
g_return_val_if_fail(rec != NULL, -1);
return rec->id;
}
static void signal_remove_module(void *signal, SIGNAL_REC *rec,
const char *module)
{
unsigned int index;
int signal_id, list;
signal_id = GPOINTER_TO_INT(signal);
for (list = 0; list < SIGNAL_LISTS; list++) {
if (rec->modulelist[list] == NULL)
continue;
for (index = 0; index < rec->modulelist[list]->len; index++) {
if (g_strcasecmp(g_ptr_array_index(rec->modulelist[list], index), module) == 0)
signal_remove_from_list(rec, signal_id, list, index);
}
}
}
/* remove all signals that belong to `module' */
void signals_remove_module(const char *module)
{
g_return_if_fail(module != NULL);
g_hash_table_foreach(signals, (GHFunc) signal_remove_module, (void *) module);
}
void signals_init(void)
{
signals_chunk = g_mem_chunk_new("signals", sizeof(SIGNAL_REC),
sizeof(SIGNAL_REC)*200, G_ALLOC_AND_FREE);
signals = g_hash_table_new((GHashFunc) g_direct_hash, (GCompareFunc) g_direct_equal);
}
static void signal_free(void *key, SIGNAL_REC *rec)
{
int n;
for (n = 0; n < SIGNAL_LISTS; n++) {
if (rec->siglist[n] != NULL) {
g_ptr_array_free(rec->siglist[n], TRUE);
g_ptr_array_free(rec->modulelist[n], TRUE);
}
}
g_mem_chunk_free(signals_chunk, rec);
current_emitted_signal = NULL;
}
void signals_deinit(void)
{
g_hash_table_foreach(signals, (GHFunc) signal_free, NULL);
g_hash_table_destroy(signals);
module_uniq_destroy("signals");
g_mem_chunk_destroy(signals_chunk);
}
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