This branch adds additional methods to dialplan functions, whereby the result buffers are now dynamic buffers, which can be expanded to the size of any result. No longer are variable substitutions limited to 4095 bytes of data. In addition, the common case of needing buffers much smaller than that will enable substitution to only take up the amount of memory actually needed. The existing variable substitution routines are still available, but users of those API calls should transition to using the dynamic-buffer APIs. Reviewboard: http://reviewboard.digium.com/r/174/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@191140 65c4cc65-6c06-0410-ace0-fbb531ad65f3
156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2008, Digium, Inc.
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*
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* Tilghman Lesher <tlesher@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief String manipulation API
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*
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* \author Tilghman Lesher <tilghman@digium.com>
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*/
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/*** MAKEOPTS
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<category name="MENUSELECT_CFLAGS" displayname="Compiler Flags" positive_output="yes" remove_on_change=".lastclean">
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<member name="DEBUG_OPAQUE" displayname="Change ast_str internals to detect improper usage">
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<defaultenabled>yes</defaultenabled>
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</member>
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</category>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/strings.h"
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#include "asterisk/pbx.h"
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/*!
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* core handler for dynamic strings.
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* This is not meant to be called directly, but rather through the
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* various wrapper macros
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* ast_str_set(...)
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* ast_str_append(...)
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* ast_str_set_va(...)
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* ast_str_append_va(...)
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*/
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#if (defined(MALLOC_DEBUG) && !defined(STANDALONE))
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int __ast_debug_str_helper(struct ast_str **buf, size_t max_len,
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int append, const char *fmt, va_list ap, const char *file, int lineno, const char *function)
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#else
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int __ast_str_helper(struct ast_str **buf, size_t max_len,
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int append, const char *fmt, va_list ap)
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#endif
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{
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int res, need;
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int offset = (append && (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_USED : 0;
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va_list aq;
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do {
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if (max_len < 0) {
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max_len = (*buf)->__AST_STR_LEN; /* don't exceed the allocated space */
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}
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/*
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* Ask vsnprintf how much space we need. Remember that vsnprintf
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* does not count the final <code>'\0'</code> so we must add 1.
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*/
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va_copy(aq, ap);
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res = vsnprintf((*buf)->__AST_STR_STR + offset, (*buf)->__AST_STR_LEN - offset, fmt, aq);
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need = res + offset + 1;
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/*
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* If there is not enough space and we are below the max length,
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* reallocate the buffer and return a message telling to retry.
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*/
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if (need > (*buf)->__AST_STR_LEN && (max_len == 0 || (*buf)->__AST_STR_LEN < max_len) ) {
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if (max_len && max_len < need) { /* truncate as needed */
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need = max_len;
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} else if (max_len == 0) { /* if unbounded, give more room for next time */
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need += 16 + need / 4;
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}
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if (0) { /* debugging */
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ast_verbose("extend from %d to %d\n", (int)(*buf)->__AST_STR_LEN, need);
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}
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if (
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#if (defined(MALLOC_DEBUG) && !defined(STANDALONE))
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_ast_str_make_space(buf, need, file, lineno, function)
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#else
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ast_str_make_space(buf, need)
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#endif
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) {
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ast_verbose("failed to extend from %d to %d\n", (int)(*buf)->__AST_STR_LEN, need);
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return AST_DYNSTR_BUILD_FAILED;
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}
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(*buf)->__AST_STR_STR[offset] = '\0'; /* Truncate the partial write. */
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/* Restart va_copy before calling vsnprintf() again. */
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va_end(aq);
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continue;
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}
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break;
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} while (1);
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/* update space used, keep in mind the truncation */
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(*buf)->__AST_STR_USED = (res + offset > (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_LEN : res + offset;
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return res;
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}
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char *__ast_str_helper2(struct ast_str **buf, size_t maxlen, const char *src, size_t maxsrc, int append, int escapecommas)
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{
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int dynamic = 0;
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char *ptr = append ? &((*buf)->__AST_STR_STR[(*buf)->__AST_STR_USED]) : (*buf)->__AST_STR_STR;
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if (maxlen < 1) {
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if (maxlen == 0) {
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dynamic = 1;
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}
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maxlen = (*buf)->__AST_STR_LEN;
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}
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while (*src && maxsrc && maxlen && (!escapecommas || (maxlen - 1))) {
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if (escapecommas && (*src == '\\' || *src == ',')) {
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*ptr++ = '\\';
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maxlen--;
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(*buf)->__AST_STR_USED++;
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}
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*ptr++ = *src++;
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maxsrc--;
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maxlen--;
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(*buf)->__AST_STR_USED++;
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if ((ptr >= (*buf)->__AST_STR_STR + (*buf)->__AST_STR_LEN - 3) ||
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(dynamic && (!maxlen || (escapecommas && !(maxlen - 1))))) {
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char *oldbase = (*buf)->__AST_STR_STR;
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size_t old = (*buf)->__AST_STR_LEN;
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if (ast_str_make_space(buf, (*buf)->__AST_STR_LEN * 2)) {
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/* If the buffer can't be extended, end it. */
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break;
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}
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/* What we extended the buffer by */
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maxlen = old;
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ptr += (*buf)->__AST_STR_STR - oldbase;
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}
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}
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if (__builtin_expect(!maxlen, 0)) {
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ptr--;
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}
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*ptr = '\0';
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return (*buf)->__AST_STR_STR;
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}
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