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pbx: Create pbx_sw.c for management of 'struct ast_sw'.

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This changes context switches from a linked list to a vector, makes
'struct ast_sw' opaque to pbx.c.

Although ast_walk_context_switches is maintained the procedure is no
longer efficient except for the first call (inc==NULL).  This
functionality is replaced by two new functions implemented by vector
macros.
* ast_context_switches_count (AST_VECTOR_SIZE)
* ast_context_switches_get (AST_VECTOR_GET)

As with ast_walk_context_switches callers of these functions are
expected to have locked contexts.  Only a few places in Asterisk walked
the switches, they have been converted to use the new functions.

Change-Id: I08deb016df22eee8288eb03de62593e45a1f0998
changes/82/3282/2
Corey Farrell 9 years ago
parent 3ca6407dab
commit a36a174c4b
8 changed files with 235 additions and 114 deletions
Show Stats Download Patch File Download Diff File

13
include/asterisk/pbx.h
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@ -1229,9 +1229,9 @@ const char *ast_get_extension_name(struct ast_exten *exten);
struct ast_context *ast_get_extension_context(struct ast_exten *exten);
const char *ast_get_include_name(const struct ast_include *include);
const char *ast_get_ignorepat_name(const struct ast_ignorepat *ip);
const char *ast_get_switch_name(struct ast_sw *sw);
const char *ast_get_switch_data(struct ast_sw *sw);
int ast_get_switch_eval(struct ast_sw *sw);
const char *ast_get_switch_name(const struct ast_sw *sw);
const char *ast_get_switch_data(const struct ast_sw *sw);
int ast_get_switch_eval(const struct ast_sw *sw);
/*! @} */
@ -1251,7 +1251,7 @@ const char *ast_get_context_registrar(struct ast_context *c);
const char *ast_get_extension_registrar(struct ast_exten *e);
const char *ast_get_include_registrar(const struct ast_include *i);
const char *ast_get_ignorepat_registrar(const struct ast_ignorepat *ip);
const char *ast_get_switch_registrar(struct ast_sw *sw);
const char *ast_get_switch_registrar(const struct ast_sw *sw);
/*! @} */
/*! @name Walking functions ... */
@ -1265,7 +1265,8 @@ const struct ast_include *ast_walk_context_includes(const struct ast_context *co
const struct ast_include *inc);
const struct ast_ignorepat *ast_walk_context_ignorepats(const struct ast_context *con,
const struct ast_ignorepat *ip);
struct ast_sw *ast_walk_context_switches(struct ast_context *con, struct ast_sw *sw);
const struct ast_sw *ast_walk_context_switches(const struct ast_context *con,
const struct ast_sw *sw);
/*! @} */
/*! @name Iterator functions ... */
@ -1274,6 +1275,8 @@ int ast_context_includes_count(const struct ast_context *con);
const struct ast_include *ast_context_includes_get(const struct ast_context *con, int idx);
int ast_context_ignorepats_count(const struct ast_context *con);
const struct ast_ignorepat *ast_context_ignorepats_get(const struct ast_context *con, int idx);
int ast_context_switches_count(const struct ast_context *con);
const struct ast_sw *ast_context_switches_get(const struct ast_context *con, int idx);
/*! @} */
/*!

194
main/pbx.c
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@ -255,16 +255,6 @@ struct ast_exten {
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 stuff[0];
};
/*! \brief match_char: forms a syntax tree for quick matching of extension patterns */
struct match_char
{
@ -297,10 +287,10 @@ struct ast_context {
struct ast_context *next; /*!< Link them together */
struct ast_includes includes; /*!< Include other contexts */
struct ast_ignorepats ignorepats; /*!< Patterns for which to continue playing dialtone */
struct ast_sws alts; /*!< Alternative switches */
char *registrar; /*!< Registrar -- make sure you malloc this, as the registrar may have to survive module unloads */
int refcount; /*!< each module that would have created this context should inc/dec this as appropriate */
int autohints; /*!< Whether autohints support is enabled or not */
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 */
};
@ -2375,10 +2365,10 @@ struct fake_context /* this struct is purely for matching in the hashtab */
struct ast_context *next;
struct ast_includes includes;
struct ast_ignorepats ignorepats;
struct ast_sws alts;
const char *registrar;
int refcount;
int autohints;
AST_LIST_HEAD_NOLOCK(, ast_sw) alts;
ast_mutex_t macrolock;
char name[256];
};
@ -2433,7 +2423,6 @@ struct ast_exten *pbx_find_extension(struct ast_channel *chan,
int x, res;
struct ast_context *tmp = NULL;
struct ast_exten *e = NULL, *eroot = NULL;
struct ast_sw *sw = NULL;
struct ast_exten pattern = {NULL, };
struct scoreboard score = {0, };
struct ast_str *tmpdata = NULL;
@ -2657,23 +2646,28 @@ struct ast_exten *pbx_find_extension(struct ast_channel *chan,
}
/* Check alternative switches */
AST_LIST_TRAVERSE(&tmp->alts, sw, list) {
struct ast_switch *asw = pbx_findswitch(sw->name);
for (idx = 0; idx < ast_context_switches_count(tmp); idx++) {
const struct ast_sw *sw = ast_context_switches_get(tmp, idx);
struct ast_switch *asw = pbx_findswitch(ast_get_switch_name(sw));
ast_switch_f *aswf = NULL;
char *datap;
const char *datap;
if (!asw) {
ast_log(LOG_WARNING, "No such switch '%s'\n", sw->name);
ast_log(LOG_WARNING, "No such switch '%s'\n", ast_get_switch_name(sw));
continue;
}
/* Substitute variables now */
if (sw->eval) {
if (ast_get_switch_eval(sw)) {
if (!(tmpdata = ast_str_thread_get(&switch_data, 512))) {
ast_log(LOG_WARNING, "Can't evaluate switch?!\n");
continue;
}
pbx_substitute_variables_helper(chan, sw->data, ast_str_buffer(tmpdata), ast_str_size(tmpdata));
pbx_substitute_variables_helper(chan, ast_get_switch_data(sw),
ast_str_buffer(tmpdata), ast_str_size(tmpdata));
datap = ast_str_buffer(tmpdata);
} else {
datap = ast_get_switch_data(sw);
}
/* equivalent of extension_match_core() at the switch level */
@ -2683,7 +2677,6 @@ struct ast_exten *pbx_find_extension(struct ast_channel *chan,
aswf = asw->matchmore;
else /* action == E_MATCH */
aswf = asw->exists;
datap = sw->eval ? ast_str_buffer(tmpdata) : sw->data;
if (!aswf)
res = 0;
else {
@ -4819,24 +4812,29 @@ int ast_context_remove_switch(const char *context, const char *sw, const char *d
*/
int ast_context_remove_switch2(struct ast_context *con, const char *sw, const char *data, const char *registrar)
{
struct ast_sw *i;
int idx;
int ret = -1;
ast_wrlock_context(con);
/* walk switches */
AST_LIST_TRAVERSE_SAFE_BEGIN(&con->alts, i, list) {
if (!strcmp(i->name, sw) && !strcmp(i->data, data) &&
(!registrar || !strcmp(i->registrar, registrar))) {
for (idx = 0; idx < ast_context_switches_count(con); idx++) {
struct ast_sw *i = AST_VECTOR_GET(&con->alts, idx);
if (!strcmp(ast_get_switch_name(i), sw) &&
!strcmp(ast_get_switch_data(i), data) &&
(!registrar || !strcmp(ast_get_switch_registrar(i), registrar))) {
/* found, remove from list */
ast_verb(3, "Removing switch '%s' from context '%s; registrar=%s'\n", sw, ast_get_context_name(con), registrar);
AST_LIST_REMOVE_CURRENT(list);
ast_free(i); /* free switch and return */
AST_VECTOR_REMOVE_ORDERED(&con->alts, idx);
/* free switch and return */
sw_free(i);
ret = 0;
break;
}
}
AST_LIST_TRAVERSE_SAFE_END;
ast_unlock_context(con);
@ -5517,8 +5515,9 @@ static int show_dialplan_helper(int fd, const char *context, const char *exten,
}
}
if (!rinclude) {
struct ast_sw *sw = NULL;
while ( (sw = ast_walk_context_switches(c, sw)) ) {
for (idx = 0; idx < ast_context_switches_count(c); idx++) {
const struct ast_sw *sw = ast_context_switches_get(c, idx);
snprintf(buf, sizeof(buf), "'%s/%s'",
ast_get_switch_name(sw),
ast_get_switch_data(sw));
@ -5836,8 +5835,9 @@ static int manager_show_dialplan_helper(struct mansession *s, const struct messa
}
}
if (!rinclude) {
struct ast_sw *sw = NULL;
while ( (sw = ast_walk_context_switches(c, sw)) ) {
for (idx = 0; idx < ast_context_switches_count(c); idx++) {
const struct ast_sw *sw = ast_context_switches_get(c, idx);
if (!dpc->total_items++)
manager_dpsendack(s, m);
astman_append(s, "Event: ListDialplan\r\n%s", actionidtext);
@ -6087,6 +6087,7 @@ struct ast_context *ast_context_find_or_create(struct ast_context **extcontexts,
tmp->registrar = ast_strdup(registrar);
AST_VECTOR_INIT(&tmp->includes, 0);
AST_VECTOR_INIT(&tmp->ignorepats, 0);
AST_VECTOR_INIT(&tmp->alts, 0);
tmp->refcount = 1;
} else {
ast_log(LOG_ERROR, "Danger! We failed to allocate a context for %s!\n", name);
@ -6138,7 +6139,6 @@ AST_LIST_HEAD_NOLOCK(store_hints, store_hint);
static void context_merge_incls_swits_igps_other_registrars(struct ast_context *new, struct ast_context *old, const char *registrar)
{
int idx;
struct ast_sw *sw;
ast_verb(3, "merging incls/swits/igpats from old(%s) to new(%s) context, registrar = %s\n", ast_get_context_name(old), ast_get_context_name(new), registrar);
/* copy in the includes, switches, and ignorepats */
@ -6153,9 +6153,12 @@ static void context_merge_incls_swits_igps_other_registrars(struct ast_context *
}
/* walk through switches */
for (sw = NULL; (sw = ast_walk_context_switches(old, sw)) ; ) {
if (strcmp(ast_get_switch_registrar(sw), registrar) == 0)
for (idx = 0; idx < ast_context_switches_count(old); idx++) {
const struct ast_sw *sw = ast_context_switches_get(old, idx);
if (!strcmp(ast_get_switch_registrar(sw), registrar)) {
continue; /* not mine */
}
ast_context_add_switch2(new, ast_get_switch_name(sw), ast_get_switch_data(sw), ast_get_switch_eval(sw), ast_get_switch_registrar(sw));
}
@ -6622,43 +6625,24 @@ int ast_context_add_switch(const char *context, const char *sw, const char *data
int ast_context_add_switch2(struct ast_context *con, const char *value,
const char *data, int eval, const char *registrar)
{
int idx;
struct ast_sw *new_sw;
struct ast_sw *i;
int length;
char *p;
length = sizeof(struct ast_sw);
length += strlen(value) + 1;
if (data)
length += strlen(data);
length++;
/* allocate new sw structure ... */
if (!(new_sw = ast_calloc(1, length)))
if (!(new_sw = sw_alloc(value, data, eval, registrar))) {
return -1;
/* ... fill in this structure ... */
p = new_sw->stuff;
new_sw->name = p;
strcpy(new_sw->name, value);
p += strlen(value) + 1;
new_sw->data = p;
if (data) {
strcpy(new_sw->data, data);
p += strlen(data) + 1;
} else {
strcpy(new_sw->data, "");
p++;
}
new_sw->eval = eval;
new_sw->registrar = registrar;
/* ... try to lock this context ... */
ast_wrlock_context(con);
/* ... go to last sw and check if context is already swd too... */
AST_LIST_TRAVERSE(&con->alts, i, list) {
if (!strcasecmp(i->name, new_sw->name) && !strcasecmp(i->data, new_sw->data)) {
ast_free(new_sw);
for (idx = 0; idx < ast_context_switches_count(con); idx++) {
const struct ast_sw *i = ast_context_switches_get(con, idx);
if (!strcasecmp(ast_get_switch_name(i), ast_get_switch_name(new_sw)) &&
!strcasecmp(ast_get_switch_data(i), ast_get_switch_data(new_sw))) {
sw_free(new_sw);
ast_unlock_context(con);
errno = EEXIST;
return -1;
@ -6666,9 +6650,10 @@ int ast_context_add_switch2(struct ast_context *con, const char *value,
}
/* ... sw new context into context list, unlock, return */
AST_LIST_INSERT_TAIL(&con->alts, new_sw, list);
AST_VECTOR_APPEND(&con->alts, new_sw);
ast_verb(3, "Including switch '%s/%s' in context '%s'\n", new_sw->name, new_sw->data, ast_get_context_name(con));
ast_verb(3, "Including switch '%s/%s' in context '%s'\n",
ast_get_switch_name(new_sw), ast_get_switch_data(new_sw), ast_get_context_name(con));
ast_unlock_context(con);
@ -7775,7 +7760,6 @@ int ast_pbx_outgoing_app(const char *type, struct ast_format_cap *cap, const cha
static void __ast_internal_context_destroy( struct ast_context *con)
{
struct ast_sw *sw;
struct ast_exten *e, *el, *en;
struct ast_context *tmp = con;
@ -7787,6 +7771,10 @@ static void __ast_internal_context_destroy( struct ast_context *con)
AST_VECTOR_CALLBACK_VOID(&tmp->ignorepats, ignorepat_free);
AST_VECTOR_FREE(&tmp->ignorepats);
/* Free switches */
AST_VECTOR_CALLBACK_VOID(&tmp->alts, sw_free);
AST_VECTOR_FREE(&tmp->alts);
if (tmp->registrar)
ast_free(tmp->registrar);
@ -7798,8 +7786,6 @@ static void __ast_internal_context_destroy( struct ast_context *con)
if (tmp->pattern_tree)
destroy_pattern_tree(tmp->pattern_tree);
while ((sw = AST_LIST_REMOVE_HEAD(&tmp->alts, list)))
ast_free(sw);
for (e = tmp->root; e;) {
for (en = e->peer; en;) {
el = en;
@ -7846,7 +7832,6 @@ void __ast_context_destroy(struct ast_context *list, struct ast_hashtab *context
/* then search thru and remove any extens that match registrar. */
struct ast_hashtab_iter *exten_iter;
struct ast_hashtab_iter *prio_iter;
struct ast_sw *sw = NULL;
int idx;
/* remove any ignorepats whose registrar matches */
@ -7868,13 +7853,14 @@ void __ast_context_destroy(struct ast_context *list, struct ast_hashtab *context
}
}
/* remove any switches whose registrar matches */
AST_LIST_TRAVERSE_SAFE_BEGIN(&tmp->alts, sw, list) {
if (strcmp(sw->registrar,registrar) == 0) {
AST_LIST_REMOVE_CURRENT(list);
ast_free(sw);
for (idx = ast_context_switches_count(tmp) - 1; idx >= 0; idx--) {
struct ast_sw *sw = AST_VECTOR_GET(&tmp->alts, idx);
if (!strcmp(ast_get_switch_registrar(sw), registrar)) {
AST_VECTOR_REMOVE_ORDERED(&tmp->alts, idx);
sw_free(sw);
}
}
AST_LIST_TRAVERSE_SAFE_END;
if (tmp->root_table) { /* it is entirely possible that the context is EMPTY */
exten_iter = ast_hashtab_start_traversal(tmp->root_table);
@ -7925,7 +7911,7 @@ void __ast_context_destroy(struct ast_context *list, struct ast_hashtab *context
/* delete the context if it's registrar matches, is empty, has refcount of 1, */
/* it's not empty, if it has includes, ignorepats, or switches that are registered from
another registrar. It's not empty if there are any extensions */
if (strcmp(tmp->registrar, registrar) == 0 && tmp->refcount < 2 && !tmp->root && !ast_context_ignorepats_count(tmp) && !ast_context_includes_count(tmp) && AST_LIST_EMPTY(&tmp->alts)) {
if (strcmp(tmp->registrar, registrar) == 0 && tmp->refcount < 2 && !tmp->root && !ast_context_ignorepats_count(tmp) && !ast_context_includes_count(tmp) && !ast_context_switches_count(tmp)) {
ast_debug(1, "delete ctx %s %s\n", tmp->name, tmp->registrar);
ast_hashtab_remove_this_object(contexttab, tmp);
@ -8364,26 +8350,6 @@ void *ast_get_extension_app_data(struct ast_exten *e)
return e ? e->data : NULL;
}
const char *ast_get_switch_name(struct ast_sw *sw)
{
return sw ? sw->name : NULL;
}
const char *ast_get_switch_data(struct ast_sw *sw)
{
return sw ? sw->data : NULL;
}
int ast_get_switch_eval(struct ast_sw *sw)
{
return sw->eval;
}
const char *ast_get_switch_registrar(struct ast_sw *sw)
{
return sw ? sw->registrar : NULL;
}
/*
* Walking functions ...
*/
@ -8401,13 +8367,43 @@ struct ast_exten *ast_walk_context_extensions(struct ast_context *con,
return exten->next;
}
struct ast_sw *ast_walk_context_switches(struct ast_context *con,
struct ast_sw *sw)
const struct ast_sw *ast_walk_context_switches(const struct ast_context *con,
const struct ast_sw *sw)
{
if (!sw)
return con ? AST_LIST_FIRST(&con->alts) : NULL;
else
return AST_LIST_NEXT(sw, list);
if (sw) {
int idx;
int next = 0;
for (idx = 0; idx < ast_context_switches_count(con); idx++) {
const struct ast_sw *s = ast_context_switches_get(con, idx);
if (next) {
return s;
}
if (sw == s) {
next = 1;
}
}
return NULL;
}
if (!ast_context_switches_count(con)) {
return NULL;
}
return ast_context_switches_get(con, 0);
}
int ast_context_switches_count(const struct ast_context *con)
{
return AST_VECTOR_SIZE(&con->alts);
}
const struct ast_sw *ast_context_switches_get(const struct ast_context *con, int idx)
{
return AST_VECTOR_GET(&con->alts, idx);
}
struct ast_exten *ast_walk_extension_priorities(struct ast_exten *exten,

6
main/pbx_private.h
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@ -49,6 +49,12 @@ void include_free(struct ast_include *inc);
int include_valid(const struct ast_include *inc);
const char *include_rname(const struct ast_include *inc);
/*! pbx_sw.c */
struct ast_sw;
AST_VECTOR(ast_sws, struct ast_sw *);
struct ast_sw *sw_alloc(const char *value, const char *data, int eval, const char *registrar);
void sw_free(struct ast_sw *sw);
/*! pbx_builtins.c functions needed by pbx.c */
int indicate_congestion(struct ast_channel *, const char *);
int indicate_busy(struct ast_channel *, const char *);

107
main/pbx_sw.c
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@ -0,0 +1,107 @@
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2016, CFWare, LLC
*
* Corey Farrell <git@cfware.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Dialplan switch routines.
*
* \author Corey Farrell <git@cfware.com>
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_REGISTER_FILE()
#include "asterisk/_private.h"
#include "asterisk/pbx.h"
#include "pbx_private.h"
/*! \brief ast_sw: Switch statement in extensions.conf */
struct ast_sw {
const char *name;
/*! Registrar */
const char *registrar;
/*! Data load */
const char *data;
int eval;
AST_LIST_ENTRY(ast_sw) list;
char stuff[0];
};
const char *ast_get_switch_name(const struct ast_sw *sw)
{
return sw ? sw->name : NULL;
}
const char *ast_get_switch_data(const struct ast_sw *sw)
{
return sw ? sw->data : NULL;
}
int ast_get_switch_eval(const struct ast_sw *sw)
{
return sw->eval;
}
const char *ast_get_switch_registrar(const struct ast_sw *sw)
{
return sw ? sw->registrar : NULL;
}
struct ast_sw *sw_alloc(const char *value, const char *data, int eval, const char *registrar)
{
struct ast_sw *new_sw;
int length;
char *p;
if (!data) {
data = "";
}
length = sizeof(struct ast_sw);
length += strlen(value) + 1;
length += strlen(data) + 1;
/* allocate new sw structure ... */
if (!(new_sw = ast_calloc(1, length))) {
return NULL;
}
/* ... fill in this structure ... */
p = new_sw->stuff;
new_sw->name = p;
strcpy(p, value);
p += strlen(value) + 1;
new_sw->data = p;
strcpy(p, data);
new_sw->eval = eval;
new_sw->registrar = registrar;
return new_sw;
}
void sw_free(struct ast_sw *sw)
{
ast_free(sw);
}

8
pbx/pbx_config.c
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@ -928,7 +928,6 @@ static char *handle_cli_dialplan_save(struct ast_cli_entry *e, int cmd, struct a
int context_header_written = 0;
struct ast_exten *ext, *last_written_e = NULL;
int idx;
struct ast_sw *sw;
/* try to lock context and fireout all info */
if (ast_rdlock_context(c)) { /* lock failure */
@ -1016,7 +1015,9 @@ static char *handle_cli_dialplan_save(struct ast_cli_entry *e, int cmd, struct a
}
/* walk through switches */
for (sw = NULL; (sw = ast_walk_context_switches(c, sw)) ; ) {
for (idx = 0; idx < ast_context_switches_count(c); idx++) {
const struct ast_sw *sw = ast_context_switches_get(c, idx);
if (strcmp(ast_get_switch_registrar(sw), registrar) != 0)
continue; /* not mine */
PUT_CTX_HDR;
@ -1024,8 +1025,9 @@ static char *handle_cli_dialplan_save(struct ast_cli_entry *e, int cmd, struct a
ast_get_switch_name(sw), ast_get_switch_data(sw));
}
if (ast_walk_context_switches(c, NULL))
if (ast_context_switches_count(c)) {
fprintf(output, "\n");
}
/* fireout ignorepats ... */
for (idx = 0; idx < ast_context_ignorepats_count(c); idx++) {

2
res/ael/pval.c
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@ -4410,7 +4410,7 @@ static int context_used(struct ael_extension *exten_list, struct ast_context *co
{
struct ael_extension *exten;
/* Check the simple elements first */
if (ast_walk_context_extensions(context, NULL) || ast_context_includes_count(context) || ast_context_ignorepats_count(context) || ast_walk_context_switches(context, NULL)) {
if (ast_walk_context_extensions(context, NULL) || ast_context_includes_count(context) || ast_context_ignorepats_count(context) || ast_context_switches_count(context)) {
return 1;
}
for (exten = exten_list; exten; exten = exten->next_exten) {

6
utils/conf2ael.c
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@ -670,12 +670,6 @@ const struct ast_include *ast_walk_context_includes(const struct ast_context *co
return NULL;
}
struct ast_sw *ast_walk_context_switches(struct ast_context *con, struct ast_sw *sw);
struct ast_sw *ast_walk_context_switches(struct ast_context *con, struct ast_sw *sw)
{
return NULL;
}
struct ast_exten *pbx_find_extension(struct ast_channel *chan,
struct ast_context *bypass,
struct pbx_find_info *q,

13
utils/extconf.c
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@ -4448,6 +4448,19 @@ struct ast_sw *localized_walk_context_switches(struct ast_context *con,
return ast_walk_context_switches(con, sw);
}
int ast_context_switches_count(struct ast_context *con);
int ast_context_switches_count(struct ast_context *con)
{
int c = 0;
struct ast_sw *sw = NULL;
while ((sw = ast_walk_context_switches(con, sw))) {
c++;
}
return c;
}
static struct ast_context *ast_context_find(const char *name);

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