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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2008, Digium, Inc.
*
* Tilghman Lesher <tlesher@digium.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 String manipulation API
*
* \author Tilghman Lesher <tilghman@digium.com>
*/
/*** MAKEOPTS
<category name="MENUSELECT_CFLAGS" displayname="Compiler Flags" positive_output="yes">
<member name="DEBUG_OPAQUE" displayname="Change ast_str internals to detect improper usage" touch_on_change="include/asterisk/strings.h">
<defaultenabled>yes</defaultenabled>
</member>
</category>
***/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/strings.h"
#include "asterisk/pbx.h"
/*!
* core handler for dynamic strings.
* This is not meant to be called directly, but rather through the
* various wrapper macros
* ast_str_set(...)
* ast_str_append(...)
* ast_str_set_va(...)
* ast_str_append_va(...)
*/
#if (defined(MALLOC_DEBUG) && !defined(STANDALONE))
int __ast_debug_str_helper(struct ast_str **buf, ssize_t max_len,
int append, const char *fmt, va_list ap, const char *file, int lineno, const char *function)
#else
int __ast_str_helper(struct ast_str **buf, ssize_t max_len,
int append, const char *fmt, va_list ap)
#endif
{
int res;
int added;
int need;
int offset = (append && (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_USED : 0;
va_list aq;
if (max_len < 0) {
max_len = (*buf)->__AST_STR_LEN; /* don't exceed the allocated space */
}
do {
va_copy(aq, ap);
res = vsnprintf((*buf)->__AST_STR_STR + offset, (*buf)->__AST_STR_LEN - offset, fmt, aq);
va_end(aq);
if (res < 0) {
/*
* vsnprintf write to string failed.
* I don't think this is possible with a memory buffer.
*/
res = AST_DYNSTR_BUILD_FAILED;
added = 0;
break;
}
/*
* vsnprintf returns how much space we used or would need.
* Remember that vsnprintf does not count the nil terminator
* so we must add 1.
*/
added = res;
need = offset + added + 1;
if (need <= (*buf)->__AST_STR_LEN
|| (max_len && max_len <= (*buf)->__AST_STR_LEN)) {
/*
* There was enough room for the string or we are not
* allowed to try growing the string buffer.
*/
break;
}
/* Reallocate the buffer and try again. */
if (max_len == 0) {
/* unbounded, give more room for next time */
need += 16 + need / 4;
} else if (max_len < need) {
/* truncate as needed */
need = max_len;
}
if (
#if (defined(MALLOC_DEBUG) && !defined(STANDALONE))
_ast_str_make_space(buf, need, file, lineno, function)
#else
ast_str_make_space(buf, need)
#endif
) {
ast_log_safe(LOG_VERBOSE, "failed to extend from %d to %d\n",
(int) (*buf)->__AST_STR_LEN, need);
res = AST_DYNSTR_BUILD_FAILED;
break;
}
} while (1);
/* Update space used, keep in mind truncation may be necessary. */
(*buf)->__AST_STR_USED = ((*buf)->__AST_STR_LEN <= offset + added)
? (*buf)->__AST_STR_LEN - 1
: offset + added;
/* Ensure that the string is terminated. */
(*buf)->__AST_STR_STR[(*buf)->__AST_STR_USED] = '\0';
return res;
}
char *__ast_str_helper2(struct ast_str **buf, ssize_t maxlen, const char *src, size_t maxsrc, int append, int escapecommas)
{
int dynamic = 0;
char *ptr = append ? &((*buf)->__AST_STR_STR[(*buf)->__AST_STR_USED]) : (*buf)->__AST_STR_STR;
if (maxlen < 1) {
if (maxlen == 0) {
dynamic = 1;
}
maxlen = (*buf)->__AST_STR_LEN;
}
while (*src && maxsrc && maxlen && (!escapecommas || (maxlen - 1))) {
if (escapecommas && (*src == '\\' || *src == ',')) {
*ptr++ = '\\';
maxlen--;
(*buf)->__AST_STR_USED++;
}
*ptr++ = *src++;
maxsrc--;
maxlen--;
(*buf)->__AST_STR_USED++;
if ((ptr >= (*buf)->__AST_STR_STR + (*buf)->__AST_STR_LEN - 3) ||
(dynamic && (!maxlen || (escapecommas && !(maxlen - 1))))) {
char *oldbase = (*buf)->__AST_STR_STR;
size_t old = (*buf)->__AST_STR_LEN;
if (ast_str_make_space(buf, (*buf)->__AST_STR_LEN * 2)) {
/* If the buffer can't be extended, end it. */
break;
}
/* What we extended the buffer by */
maxlen = old;
ptr += (*buf)->__AST_STR_STR - oldbase;
}
}
if (__builtin_expect(!maxlen, 0)) {
ptr--;
}
*ptr = '\0';
return (*buf)->__AST_STR_STR;
}
static int str_hash(const void *obj, const int flags)
{
return ast_str_hash(obj);
}
static int str_cmp(void *lhs, void *rhs, int flags)
{
return strcmp(lhs, rhs) ? 0 : CMP_MATCH;
}
//struct ao2_container *ast_str_container_alloc_options(enum ao2_container_opts opts, int buckets)
struct ao2_container *ast_str_container_alloc_options(enum ao2_alloc_opts opts, int buckets)
{
return ao2_container_alloc_options(opts, buckets, str_hash, str_cmp);
}
int ast_str_container_add(struct ao2_container *str_container, const char *add)
{
char *ao2_add;
/* The ao2_add object is immutable so it doesn't need a lock of its own. */
ao2_add = ao2_alloc_options(strlen(add) + 1, NULL, AO2_ALLOC_OPT_LOCK_NOLOCK);
if (!ao2_add) {
return -1;
}
strcpy(ao2_add, add);/* Safe */
ao2_link(str_container, ao2_add);
ao2_ref(ao2_add, -1);
return 0;
}
void ast_str_container_remove(struct ao2_container *str_container, const char *remove)
{
ao2_find(str_container, remove, OBJ_SEARCH_KEY | OBJ_NODATA | OBJ_UNLINK);
}
char *ast_generate_random_string(char *buf, size_t size)
{
int i;
for (i = 0; i < size - 1; ++i) {
buf[i] = 'a' + (ast_random() % 26);
}
buf[i] = '\0';
return buf;
}
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