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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" remove_on_change=".lastclean">
<member name="DEBUG_OPAQUE" displayname="Change ast_str internals to detect improper usage">
<defaultenabled>yes</defaultenabled>
</member>
</category>
***/
#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, need;
int offset = (append && (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_USED : 0;
va_list aq;
do {
if (max_len < 0) {
max_len = (*buf)->__AST_STR_LEN; /* don't exceed the allocated space */
}
/*
* Ask vsnprintf how much space we need. Remember that vsnprintf
* does not count the final <code>'\0'</code> so we must add 1.
*/
va_copy(aq, ap);
res = vsnprintf((*buf)->__AST_STR_STR + offset, (*buf)->__AST_STR_LEN - offset, fmt, aq);
need = res + offset + 1;
/*
* If there is not enough space and we are below the max length,
* reallocate the buffer and return a message telling to retry.
*/
if (need > (*buf)->__AST_STR_LEN && (max_len == 0 || (*buf)->__AST_STR_LEN < max_len) ) {
int len = (int)(*buf)->__AST_STR_LEN;
if (max_len && max_len < need) { /* truncate as needed */
need = max_len;
} else if (max_len == 0) { /* if unbounded, give more room for next time */
need += 16 + need / 4;
}
if (0) { /* debugging */
ast_verbose("extend from %d to %d\n", len, need);
}
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_verbose("failed to extend from %d to %d\n", len, need);
va_end(aq);
return AST_DYNSTR_BUILD_FAILED;
}
(*buf)->__AST_STR_STR[offset] = '\0'; /* Truncate the partial write. */
/* Restart va_copy before calling vsnprintf() again. */
va_end(aq);
continue;
}
va_end(aq);
break;
} while (1);
/* update space used, keep in mind the truncation */
(*buf)->__AST_STR_USED = (res + offset > (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_LEN - 1 : res + offset;
return res;
}
void ast_str_substitute_variables(struct ast_str **buf, size_t maxlen, struct ast_channel *chan, const char *template)
{
int first = 1;
do {
ast_str_make_space(buf, maxlen ? maxlen :
(first ? strlen(template) * 2 : (*buf)->__AST_STR_LEN * 2));
pbx_substitute_variables_helper_full(chan, NULL, template, (*buf)->__AST_STR_STR, (*buf)->__AST_STR_LEN - 1, &((*buf)->__AST_STR_USED));
first = 0;
} while (maxlen == 0 && (*buf)->__AST_STR_LEN - 5 < (*buf)->__AST_STR_USED);
}
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;
}
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