xmldoc.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2008, Eliel C. Sardanons (LU1ALY) <eliels@gmail.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 XML Documentation API
 *
 * \author Eliel C. Sardanons (LU1ALY) <eliels@gmail.com>
 *
 * libxml2 http://www.xmlsoft.org/
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/_private.h"
#include "asterisk/paths.h"
#include "asterisk/linkedlists.h"
#include "asterisk/config.h"
#include "asterisk/term.h"
#include "asterisk/astobj2.h"
#include "asterisk/xmldoc.h"
#include "asterisk/cli.h"
 
#ifdef AST_XML_DOCS
 
/*! \brief Default documentation language. */
static const char default_documentation_language[] = "en_US";
 
/*! \brief Number of columns to print when showing the XML documentation with a
 *         'core show application/function *' CLI command. Used in text wrapping.*/
static const int xmldoc_text_columns = 79;
 
/*! \brief XML documentation language. */
static char documentation_language[6];
 
/*! \brief XML documentation tree */
struct documentation_tree {
    char *filename;                 /*!< XML document filename. */
    struct ast_xml_doc *doc;            /*!< Open document pointer. */
    AST_RWLIST_ENTRY(documentation_tree) entry;
};
 
static char *xmldoc_get_syntax_cmd(struct ast_xml_node *fixnode, const char *name, int printname);
static int xmldoc_parse_enumlist(struct ast_xml_node *fixnode, const char *tabs, struct ast_str **buffer);
static void xmldoc_parse_parameter(struct ast_xml_node *fixnode, const char *tabs, struct ast_str **buffer);
static int xmldoc_parse_info(struct ast_xml_node *node, const char *tabs, const char *posttabs, struct ast_str **buffer);
static int xmldoc_parse_para(struct ast_xml_node *node, const char *tabs, const char *posttabs, struct ast_str **buffer);
static int xmldoc_parse_specialtags(struct ast_xml_node *fixnode, const char *tabs, const char *posttabs, struct ast_str **buffer);
 
 
/*!
 * \brief Container of documentation trees
 *
 * \note A RWLIST is a sufficient container type to use, provided
 *       the list lock is always held while there are references to the list.
 */
static AST_RWLIST_HEAD_STATIC(xmldoc_tree, documentation_tree);
 
static const struct strcolorized_tags {
    const char *init;      /*!< Replace initial tag with this string. */
    const char *end;       /*!< Replace end tag with this string. */
    const int colorfg;     /*!< Foreground color. */
    const char *inittag;   /*!< Initial tag description. */
    const char *endtag;    /*!< Ending tag description. */
} colorized_tags[] = {
    { "<",  ">",  COLOR_GREEN,  "<replaceable>", "</replaceable>" },
    { "\'", "\'", COLOR_BLUE,   "<literal>",     "</literal>" },
    { "*",  "*",  COLOR_RED,    "<emphasis>",    "</emphasis>" },
    { "\"", "\"", COLOR_YELLOW, "<filename>",    "</filename>" },
    { "\"", "\"", COLOR_CYAN,   "<directory>",   "</directory>" },
    { "${", "}",  COLOR_GREEN,  "<variable>",    "</variable>" },
    { "",   "",   COLOR_BLUE,   "<value>",       "</value>" },
    { "",   "",   COLOR_BLUE,   "<enum>",        "</enum>" },
    { "\'", "\'", COLOR_GRAY,   "<astcli>",      "</astcli>" },
 
    /* Special tags */
    { "", "", COLOR_YELLOW, "<note>",   "</note>" },
    { "", "", COLOR_RED,   "<warning>", "</warning>" },
    { "", "", COLOR_WHITE, "<example>", "</example>" },
    { "", "", COLOR_GRAY, "<exampletext>", "</exampletext>"},
};
 
static const struct strspecial_tags {
    const char *tagname;        /*!< Special tag name. */
    const char *init;       /*!< Print this at the beginning. */
    const char *end;        /*!< Print this at the end. */
} special_tags[] = {
    { "note",    "<note>NOTE:</note> ",             "" },
    { "warning", "<warning>WARNING!!!:</warning> ", "" },
    { "example", "<example>Example:</example> ", "" },
};
 
/*!
 * \internal
 * \brief Calculate the space in bytes used by a format string
 *        that will be passed to a sprintf function.
 *
 * \param postbr The format string to use to calculate the length.
 *
 * \retval The postbr length.
 */
static int xmldoc_postbrlen(const char *postbr)
{
    int postbrreallen = 0, i;
    size_t postbrlen;
 
    if (!postbr) {
        return 0;
    }
    postbrlen = strlen(postbr);
    for (i = 0; i < postbrlen; i++) {
        if (postbr[i] == '\t') {
            postbrreallen += 8 - (postbrreallen % 8);
        } else {
            postbrreallen++;
        }
    }
    return postbrreallen;
}
 
/*!
 * \internal
 * \brief Setup postbr to be used while wrapping the text.
 *        Add to postbr array all the spaces and tabs at the beginning of text.
 *
 * \param postbr output array.
 * \param len text array length.
 * \param text Text with format string before the actual string.
 */
static void xmldoc_setpostbr(char *postbr, size_t len, const char *text)
{
    int c, postbrlen = 0;
 
    if (!text) {
        return;
    }
 
    for (c = 0; c < len; c++) {
        if (text[c] == '\t' || text[c] == ' ') {
            postbr[postbrlen++] = text[c];
        } else {
            break;
        }
    }
    postbr[postbrlen] = '\0';
}
 
/*!
 * \internal
 * \brief Justify a text to a number of columns.
 *
 * \param text Input text to be justified.
 * \param columns Number of columns to preserve in the text.
 *
 * \retval NULL on error.
 * \retval The wrapped text.
 */
static char *xmldoc_string_wrap(const char *text, int columns)
{
    struct ast_str *tmp;
    char *ret, postbr[160];
    int count, i, textlen, postbrlen, lastbreak;
 
    /* sanity check */
    if (!text || columns <= 0) {
        ast_log(LOG_WARNING, "Passing wrong arguments while trying to wrap the text\n");
        return NULL;
    }
 
    tmp = ast_str_create(strlen(text) * 3);
 
    if (!tmp) {
        return NULL;
    }
 
    /* Check for blanks and tabs and put them in postbr. */
    xmldoc_setpostbr(postbr, sizeof(postbr), text);
    postbrlen = xmldoc_postbrlen(postbr);
 
    count = 0;
    lastbreak = 0;
 
    textlen = strlen(text);
    for (i = 0; i < textlen; i++) {
        if (text[i] == '\n') {
            xmldoc_setpostbr(postbr, sizeof(postbr), &text[i] + 1);
            postbrlen = xmldoc_postbrlen(postbr);
            count = 0;
            lastbreak = 0;
        } else if (text[i] == ESC) {
            /* Walk over escape sequences without counting them. */
            do {
                ast_str_append(&tmp, 0, "%c", text[i]);
                i++;
            } while (i < textlen && text[i] != 'm');
        } else {
            if (text[i] == ' ') {
                lastbreak = i;
            }
            count++;
        }
 
        if (count > columns) {
            /* Seek backwards if it was at most 30 characters ago. */
            int back = i - lastbreak;
            if (lastbreak && back > 0 && back < 30) {
                ast_str_truncate(tmp, -back);
                i = lastbreak; /* go back a bit */
            }
            ast_str_append(&tmp, 0, "\n%s", postbr);
            count = postbrlen;
            lastbreak = 0;
        } else {
            ast_str_append(&tmp, 0, "%c", text[i]);
        }
    }
 
    ret = ast_strdup(ast_str_buffer(tmp));
    ast_free(tmp);
 
    return ret;
}
 
char *ast_xmldoc_printable(const char *bwinput, int withcolors)
{
    struct ast_str *colorized;
    char *wrapped = NULL;
    int i, c, len, colorsection;
    char *tmp;
    size_t bwinputlen;
    static const int base_fg = COLOR_CYAN;
 
    if (!bwinput) {
        return NULL;
    }
 
    bwinputlen = strlen(bwinput);
 
    if (!(colorized = ast_str_create(256))) {
        return NULL;
    }
 
    if (withcolors) {
        ast_term_color_code(&colorized, base_fg, 0);
        if (!colorized) {
            return NULL;
        }
    }
 
    for (i = 0; i < bwinputlen; i++) {
        colorsection = 0;
        /* Check if we are at the beginning of a tag to be colorized. */
        for (c = 0; c < ARRAY_LEN(colorized_tags); c++) {
            if (strncasecmp(bwinput + i, colorized_tags[c].inittag, strlen(colorized_tags[c].inittag))) {
                continue;
            }
 
            if (!(tmp = strcasestr(bwinput + i + strlen(colorized_tags[c].inittag), colorized_tags[c].endtag))) {
                continue;
            }
 
            len = tmp - (bwinput + i + strlen(colorized_tags[c].inittag));
 
            /* Setup color */
            if (withcolors) {
                if (ast_opt_light_background) {
                    /* Turn off *bright* colors */
                    ast_term_color_code(&colorized, colorized_tags[c].colorfg & 0x7f, 0);
                } else {
                    /* Turn on *bright* colors */
                    ast_term_color_code(&colorized, colorized_tags[c].colorfg | 0x80, 0);
                }
                if (!colorized) {
                    return NULL;
                }
            }
 
            /* copy initial string replace */
            ast_str_append(&colorized, 0, "%s", colorized_tags[c].init);
            if (!colorized) {
                return NULL;
            }
            {
                char buf[len + 1];
                ast_copy_string(buf, bwinput + i + strlen(colorized_tags[c].inittag), sizeof(buf));
                ast_str_append(&colorized, 0, "%s", buf);
            }
            if (!colorized) {
                return NULL;
            }
 
            /* copy the ending string replace */
            ast_str_append(&colorized, 0, "%s", colorized_tags[c].end);
            if (!colorized) {
                return NULL;
            }
 
            /* Continue with the last color. */
            if (withcolors) {
                ast_term_color_code(&colorized, base_fg, 0);
                if (!colorized) {
                    return NULL;
                }
            }
 
            i += len + strlen(colorized_tags[c].endtag) + strlen(colorized_tags[c].inittag) - 1;
            colorsection = 1;
            break;
        }
 
        if (!colorsection) {
            ast_str_append(&colorized, 0, "%c", bwinput[i]);
            if (!colorized) {
                return NULL;
            }
        }
    }
 
    if (withcolors) {
        ast_str_append(&colorized, 0, "%s", ast_term_reset());
        if (!colorized) {
            return NULL;
        }
    }
 
    /* Wrap the text, notice that string wrap will avoid cutting an ESC sequence. */
    wrapped = xmldoc_string_wrap(ast_str_buffer(colorized), xmldoc_text_columns);
 
    ast_free(colorized);
 
    return wrapped;
}
 
/*!
 * \internal
 * \brief Cleanup spaces and tabs after a \\n
 *
 * \param text String to be cleaned up.
 * \param output buffer (not already allocated).
 * \param lastspaces Remove last spaces in the string.
 * \param maintain_newlines Preserve new line characters (\\n \\r) discovered in the string
 */
static void xmldoc_string_cleanup(const char *text, struct ast_str **output, int lastspaces, int maintain_newlines)
{
    int i;
    size_t textlen;
 
    if (!text) {
        *output = NULL;
        return;
    }
 
    textlen = strlen(text);
 
    *output = ast_str_create(textlen);
    if (!(*output)) {
        ast_log(LOG_ERROR, "Problem allocating output buffer\n");
        return;
    }
 
    for (i = 0; i < textlen; i++) {
        if (text[i] == '\n' || text[i] == '\r') {
            if (maintain_newlines) {
                ast_str_append(output, 0, "%c", text[i]);
            }
            /* remove spaces/tabs/\n after a \n. */
            while (text[i + 1] == '\t' || text[i + 1] == '\r' || text[i + 1] == '\n') {
                i++;
            }
            ast_str_append(output, 0, " ");
            continue;
        } else {
            ast_str_append(output, 0, "%c", text[i]);
        }
    }
 
    /* remove last spaces (we don't want always to remove the trailing spaces). */
    if (lastspaces) {
        ast_str_trim_blanks(*output);
    }
}
 
/*!
 * \internal
 * \brief Check if the given attribute on the given node matches the given value.
 *
 * \param node the node to match
 * \param attr the name of the attribute
 * \param value the expected value of the attribute
 *
 * \retval true if the given attribute contains the given value
 * \retval false if the given attribute does not exist or does not contain the given value
 */
static int xmldoc_attribute_match(struct ast_xml_node *node, const char *attr, const char *value)
{
    const char *attr_value = ast_xml_get_attribute(node, attr);
    int match = attr_value && !strcmp(attr_value, value);
    ast_xml_free_attr(attr_value);
    return match;
}
 
/*!
 * \internal
 * \brief Get the application/function node for 'name' application/function with language 'language'
 *        and module 'module' if we don't find any, get the first application
 *        with 'name' no matter which language or module.
 *
 * \param type 'application', 'function', ...
 * \param name Application or Function name.
 * \param module Module item is in.
 * \param language Try to get this language (if not found try with en_US)
 *
 * \retval NULL on error.
 * \retval A node of type ast_xml_node.
 *
 * \note Must be called with a RDLOCK held on xmldoc_tree
 */
static struct ast_xml_node *xmldoc_get_node(const char *type, const char *name, const char *module, const char *language)
{
    struct ast_xml_node *node = NULL;
    struct ast_xml_node *first_match = NULL;
    struct ast_xml_node *lang_match = NULL;
    struct documentation_tree *doctree;
 
    AST_LIST_TRAVERSE(&xmldoc_tree, doctree, entry) {
        /* the core xml documents have priority over thirdparty document. */
        node = ast_xml_get_root(doctree->doc);
        if (!node) {
            break;
        }
 
        node = ast_xml_node_get_children(node);
        while ((node = ast_xml_find_element(node, type, "name", name))) {
            if (!ast_xml_node_get_children(node)) {
                /* ignore empty nodes */
                node = ast_xml_node_get_next(node);
                continue;
            }
 
            if (!first_match) {
                first_match = node;
            }
 
            /* Check language */
            if (xmldoc_attribute_match(node, "language", language)) {
                if (!lang_match) {
                    lang_match = node;
                }
 
                /* if module is empty we have a match */
                if (ast_strlen_zero(module)) {
                    break;
                }
 
                /* Check module */
                if (xmldoc_attribute_match(node, "module", module)) {
                    break;
                }
            }
 
            node = ast_xml_node_get_next(node);
        }
 
        /* if we matched lang and module return this match */
        if (node) {
            break;
        }
 
        /* we didn't match lang and module, just return the first
         * result with a matching language if we have one */
        if (lang_match) {
            node = lang_match;
            break;
        }
 
        /* we didn't match with only the language, just return the
         * first match */
        if (first_match) {
            node = first_match;
            break;
        }
    }
 
    return node;
}
 
/*!
 * \internal
 * \brief Helper function used to build the syntax, it allocates the needed buffer (or reallocates it),
 *        and based on the reverse value it makes use of fmt to print the parameter list inside the
 *        realloced buffer (syntax).
 *
 * \param reverse We are going backwards while generating the syntax?
 * \param len Current length of 'syntax' buffer.
 * \param syntax Output buffer for the concatenated values.
 * \param fmt A format string that will be used in a sprintf call.
 */
static void __attribute__((format(printf, 4, 5))) xmldoc_reverse_helper(int reverse, int *len, char **syntax, const char *fmt, ...)
{
    int totlen;
    int tmpfmtlen;
    char *tmpfmt;
    char *new_syntax;
    char tmp;
    va_list ap;
 
    va_start(ap, fmt);
    if (ast_vasprintf(&tmpfmt, fmt, ap) < 0) {
        va_end(ap);
        return;
    }
    va_end(ap);
 
    tmpfmtlen = strlen(tmpfmt);
    totlen = *len + tmpfmtlen + 1;
 
    new_syntax = ast_realloc(*syntax, totlen);
    if (!new_syntax) {
        ast_free(tmpfmt);
        return;
    }
    *syntax = new_syntax;
 
    if (reverse) {
        memmove(*syntax + tmpfmtlen, *syntax, *len);
        /* Save this char, it will be overwritten by the \0 of strcpy. */
        tmp = (*syntax)[0];
        strcpy(*syntax, tmpfmt);
        /* Restore the already saved char. */
        (*syntax)[tmpfmtlen] = tmp;
        (*syntax)[totlen - 1] = '\0';
    } else {
        strcpy(*syntax + *len, tmpfmt);
    }
 
    *len = totlen - 1;
    ast_free(tmpfmt);
}
 
/*!
 * \internal
 * \brief Check if the passed node has 'what' tags inside it.
 *
 * \param fixnode Root node to search 'what' elements.
 * \param what    Node name to search inside node.
 *
 * \retval 1 If a 'what' element is found inside 'node'.
 * \retval 0 If no 'what' is found inside 'node'.
 */
static int xmldoc_has_inside(struct ast_xml_node *fixnode, const char *what)
{
    struct ast_xml_node *node = fixnode;
 
    for (node = ast_xml_node_get_children(fixnode); node; node = ast_xml_node_get_next(node)) {
        if (!strcasecmp(ast_xml_node_get_name(node), what)) {
            return 1;
        }
    }
    return 0;
}
 
/*!
 * \internal
 * \brief Check if the passed node has at least one node inside it.
 *
 * \param fixnode Root node to search node elements.
 *
 * \retval 1 If a node element is found inside 'node'.
 * \retval 0 If no node is found inside 'node'.
 */
static int xmldoc_has_nodes(struct ast_xml_node *fixnode)
{
    struct ast_xml_node *node = fixnode;
 
    for (node = ast_xml_node_get_children(fixnode); node; node = ast_xml_node_get_next(node)) {
        if (strcasecmp(ast_xml_node_get_name(node), "text")) {
            return 1;
        }
    }
    return 0;
}
 
/*!
 * \internal
 * \brief Check if the passed node has at least one specialtag.
 *
 * \param fixnode Root node to search "specialtags" elements.
 *
 * \retval 1 If a "specialtag" element is found inside 'node'.
 * \retval 0 If no "specialtag" is found inside 'node'.
 */
static int xmldoc_has_specialtags(struct ast_xml_node *fixnode)
{
    struct ast_xml_node *node = fixnode;
    int i;
 
    for (node = ast_xml_node_get_children(fixnode); node; node = ast_xml_node_get_next(node)) {
        for (i = 0; i < ARRAY_LEN(special_tags); i++) {
            if (!strcasecmp(ast_xml_node_get_name(node), special_tags[i].tagname)) {
                return 1;
            }
        }
    }
    return 0;
}
 
/*!
 * \internal
 * \brief Build the syntax for a specified starting node.
 *
 * \param rootnode A pointer to the ast_xml root node.
 * \param rootname Name of the application, function, option, etc. to build the syntax.
 * \param childname The name of each parameter node.
 * \param printparenthesis Boolean if we must print parenthesis if not parameters are found in the rootnode.
 * \param printrootname Boolean if we must print the rootname before the syntax and parenthesis at the begining/end.
 *
 * \retval NULL on error.
 * \retval An ast_malloc'ed string with the syntax generated.
 */
static char *xmldoc_get_syntax_fun(struct ast_xml_node *rootnode, const char *rootname, const char *childname, int printparenthesis, int printrootname)
{
#define GOTONEXT(__rev, __a) (__rev ? ast_xml_node_get_prev(__a) : ast_xml_node_get_next(__a))
#define ISLAST(__rev, __a)  (__rev == 1 ? (ast_xml_node_get_prev(__a) ? 0 : 1) : (ast_xml_node_get_next(__a) ? 0 : 1))
#define MP(__a) ((multiple ? __a : ""))
    struct ast_xml_node *node = NULL, *firstparam = NULL, *lastparam = NULL;
    const char *paramtype, *multipletype, *paramnameattr, *attrargsep, *parenthesis, *argname;
    int reverse, required, paramcount = 0, openbrackets = 0, len = 0, hasparams=0;
    int reqfinode = 0, reqlanode = 0, optmidnode = 0, prnparenthesis, multiple;
    char *syntax = NULL, *argsep, *paramname;
 
    if (ast_strlen_zero(rootname) || ast_strlen_zero(childname)) {
        ast_log(LOG_WARNING, "Tried to look in XML tree with faulty rootname or childname while creating a syntax.\n");
        return NULL;
    }
 
    if (!rootnode || !ast_xml_node_get_children(rootnode)) {
        /* If the rootnode field is not found, at least print name. */
        if (ast_asprintf(&syntax, "%s%s", (printrootname ? rootname : ""), (printparenthesis ? "()" : "")) < 0) {
            syntax = NULL;
        }
        return syntax;
    }
 
    /* Get the argument separator from the root node attribute name 'argsep', if not found
    defaults to ','. */
    attrargsep = ast_xml_get_attribute(rootnode, "argsep");
    if (attrargsep) {
        argsep = ast_strdupa(attrargsep);
        ast_xml_free_attr(attrargsep);
    } else {
        argsep = ast_strdupa(",");
    }
 
    /* Get order of evaluation. */
    for (node = ast_xml_node_get_children(rootnode); node; node = ast_xml_node_get_next(node)) {
        if (strcasecmp(ast_xml_node_get_name(node), childname)) {
            continue;
        }
        required = 0;
        hasparams = 1;
        if ((paramtype = ast_xml_get_attribute(node, "required"))) {
            if (ast_true(paramtype)) {
                required = 1;
            }
            ast_xml_free_attr(paramtype);
        }
 
        lastparam = node;
        reqlanode = required;
 
        if (!firstparam) {
            /* first parameter node */
            firstparam = node;
            reqfinode = required;
        }
    }
 
    if (!hasparams) {
        /* This application, function, option, etc, doesn't have any params. */
        if (ast_asprintf(&syntax, "%s%s", (printrootname ? rootname : ""), (printparenthesis ? "()" : "")) < 0) {
            syntax = NULL;
        }
        return syntax;
    }
 
    if (reqfinode && reqlanode) {
        /* check midnode */
        for (node = ast_xml_node_get_children(rootnode); node; node = ast_xml_node_get_next(node)) {
            if (strcasecmp(ast_xml_node_get_name(node), childname)) {
                continue;
            }
            if (node != firstparam && node != lastparam) {
                if ((paramtype = ast_xml_get_attribute(node, "required"))) {
                    if (!ast_true(paramtype)) {
                        optmidnode = 1;
                        ast_xml_free_attr(paramtype);
                        break;
                    }
                    ast_xml_free_attr(paramtype);
                }
            }
        }
    }
 
    if ((!reqfinode && reqlanode) || (reqfinode && reqlanode && optmidnode)) {
        reverse = 1;
        node = lastparam;
    } else {
        reverse = 0;
        node = firstparam;
    }
 
    /* init syntax string. */
    if (reverse) {
        xmldoc_reverse_helper(reverse, &len, &syntax,
            (printrootname ? (printrootname == 2 ? ")]" : ")"): ""));
    } else {
        xmldoc_reverse_helper(reverse, &len, &syntax, "%s%s", (printrootname ? rootname : ""),
            (printrootname ? (printrootname == 2 ? "[(" : "(") : ""));
    }
 
    for (; node; node = GOTONEXT(reverse, node)) {
        if (strcasecmp(ast_xml_node_get_name(node), childname)) {
            continue;
        }
 
        /* Get the argument name, if it is not the leaf, go inside that parameter. */
        if (xmldoc_has_inside(node, "argument")) {
            parenthesis = ast_xml_get_attribute(node, "hasparams");
            prnparenthesis = 0;
            if (parenthesis) {
                prnparenthesis = ast_true(parenthesis);
                if (!strcasecmp(parenthesis, "optional")) {
                    prnparenthesis = 2;
                }
                ast_xml_free_attr(parenthesis);
            }
            argname = ast_xml_get_attribute(node, "name");
            if (argname) {
                paramname = xmldoc_get_syntax_fun(node, argname, "argument", prnparenthesis, prnparenthesis);
                ast_xml_free_attr(argname);
            } else {
                /* Malformed XML, print **UNKOWN** */
                paramname = ast_strdup("**unknown**");
            }
        } else {
            paramnameattr = ast_xml_get_attribute(node, "name");
            if (!paramnameattr) {
                ast_log(LOG_WARNING, "Malformed XML %s: no %s name\n", rootname, childname);
                if (syntax) {
                    /* Free already allocated syntax */
                    ast_free(syntax);
                }
                /* to give up is ok? */
                if (ast_asprintf(&syntax, "%s%s", (printrootname ? rootname : ""), (printparenthesis ? "()" : "")) < 0) {
                    syntax = NULL;
                }
                return syntax;
            }
            paramname = ast_strdup(paramnameattr);
            ast_xml_free_attr(paramnameattr);
        }
 
        if (!paramname) {
            return NULL;
        }
 
        /* Defaults to 'false'. */
        multiple = 0;
        if ((multipletype = ast_xml_get_attribute(node, "multiple"))) {
            if (ast_true(multipletype)) {
                multiple = 1;
            }
            ast_xml_free_attr(multipletype);
        }
 
        required = 0;   /* Defaults to 'false'. */
        if ((paramtype = ast_xml_get_attribute(node, "required"))) {
            if (ast_true(paramtype)) {
                required = 1;
            }
            ast_xml_free_attr(paramtype);
        }
 
        /* build syntax core. */
 
        if (required) {
            /* First parameter */
            if (!paramcount) {
                xmldoc_reverse_helper(reverse, &len, &syntax, "%s%s%s%s", paramname, MP("["), MP(argsep), MP("...]"));
            } else {
                /* Time to close open brackets. */
                while (openbrackets > 0) {
                    xmldoc_reverse_helper(reverse, &len, &syntax, (reverse ? "[" : "]"));
                    openbrackets--;
                }
                if (reverse) {
                    xmldoc_reverse_helper(reverse, &len, &syntax, "%s%s", paramname, argsep);
                } else {
                    xmldoc_reverse_helper(reverse, &len, &syntax, "%s%s", argsep, paramname);
                }
                xmldoc_reverse_helper(reverse, &len, &syntax, "%s%s%s", MP("["), MP(argsep), MP("...]"));
            }
        } else {
            /* First parameter */
            if (!paramcount) {
                xmldoc_reverse_helper(reverse, &len, &syntax, "[%s%s%s%s]", paramname, MP("["), MP(argsep), MP("...]"));
            } else {
                if (ISLAST(reverse, node)) {
                    /* This is the last parameter. */
                    if (reverse) {
                        xmldoc_reverse_helper(reverse, &len, &syntax, "[%s%s%s%s]%s", paramname,
                                    MP("["), MP(argsep), MP("...]"), argsep);
                    } else {
                        xmldoc_reverse_helper(reverse, &len, &syntax, "%s[%s%s%s%s]", argsep, paramname,
                                    MP("["), MP(argsep), MP("...]"));
                    }
                } else {
                    if (reverse) {
                        xmldoc_reverse_helper(reverse, &len, &syntax, "%s%s%s%s%s]", paramname, argsep,
                                    MP("["), MP(argsep), MP("...]"));
                    } else {
                        xmldoc_reverse_helper(reverse, &len, &syntax, "[%s%s%s%s%s", argsep, paramname,
                                    MP("["), MP(argsep), MP("...]"));
                    }
                    openbrackets++;
                }
            }
        }
        ast_free(paramname);
 
        paramcount++;
    }
 
    /* Time to close open brackets. */
    while (openbrackets > 0) {
        xmldoc_reverse_helper(reverse, &len, &syntax, (reverse ? "[" : "]"));
        openbrackets--;
    }
 
    /* close syntax string. */
    if (reverse) {
        xmldoc_reverse_helper(reverse, &len, &syntax, "%s%s", (printrootname ? rootname : ""),
            (printrootname ? (printrootname == 2 ? "[(" : "(") : ""));
    } else {
        xmldoc_reverse_helper(reverse, &len, &syntax, (printrootname ? (printrootname == 2 ? ")]" : ")") : ""));
    }
 
    return syntax;
#undef ISLAST
#undef GOTONEXT
#undef MP
}
 
/*!
 * \internal
 * \brief Parse an enumlist inside a <parameter> to generate a COMMAND syntax.
 *
 * \param fixnode A pointer to the <enumlist> node.
 *
 * \retval {<unknown>} on error.
 * \retval A string inside brackets {} with the enum's separated by pipes |.
 */
static char *xmldoc_parse_cmd_enumlist(struct ast_xml_node *fixnode)
{
    struct ast_xml_node *node = fixnode;
    struct ast_str *paramname;
    char *enumname, *ret;
    int first = 1;
 
    paramname = ast_str_create(128);
    if (!paramname) {
        return ast_strdup("{<unkown>}");
    }
 
    ast_str_append(&paramname, 0, "{");
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (strcasecmp(ast_xml_node_get_name(node), "enum")) {
            continue;
        }
 
        enumname = xmldoc_get_syntax_cmd(node, "", 0);
        if (!enumname) {
            continue;
        }
        if (!first) {
            ast_str_append(&paramname, 0, "|");
        }
        ast_str_append(&paramname, 0, "%s", enumname);
        first = 0;
        ast_free(enumname);
    }
 
    ast_str_append(&paramname, 0, "}");
 
    ret = ast_strdup(ast_str_buffer(paramname));
    ast_free(paramname);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Generate a syntax of COMMAND type.
 *
 * \param fixnode The <syntax> node pointer.
 * \param name The name of the 'command'.
 * \param printname Print the name of the command before the paramters?
 *
 * \return On error, return just 'name'.
 * \return On success return the generated syntax.
 */
static char *xmldoc_get_syntax_cmd(struct ast_xml_node *fixnode, const char *name, int printname)
{
    struct ast_str *syntax;
    struct ast_xml_node *tmpnode, *node = fixnode;
    char *ret, *paramname;
    const char *paramtype, *attrname, *literal;
    int required, isenum, first = 1, isliteral;
 
    if (!fixnode) {
        return NULL;
    }
 
    syntax = ast_str_create(128);
    if (!syntax) {
        /* at least try to return something... */
        return ast_strdup(name);
    }
 
    /* append name to output string. */
    if (printname) {
        ast_str_append(&syntax, 0, "%s", name);
        first = 0;
    }
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (strcasecmp(ast_xml_node_get_name(node), "parameter")) {
            continue;
        }
 
        if (xmldoc_has_inside(node, "parameter")) {
            /* is this a recursive parameter. */
            paramname = xmldoc_get_syntax_cmd(node, "", 0);
            isenum = 1;
        } else {
            for (tmpnode = ast_xml_node_get_children(node); tmpnode; tmpnode = ast_xml_node_get_next(tmpnode)) {
                if (!strcasecmp(ast_xml_node_get_name(tmpnode), "enumlist")) {
                    break;
                }
            }
            if (tmpnode) {
                /* parse enumlist (note that this is a special enumlist
                that is used to describe a syntax like {<param1>|<param2>|...} */
                paramname = xmldoc_parse_cmd_enumlist(tmpnode);
                isenum = 1;
            } else {
                /* this is a simple parameter. */
                attrname = ast_xml_get_attribute(node, "name");
                if (!attrname) {
                    /* ignore this bogus parameter and continue. */
                    continue;
                }
                paramname = ast_strdup(attrname);
                ast_xml_free_attr(attrname);
                isenum = 0;
            }
        }
 
        /* Is this parameter required? */
        required = 0;
        paramtype = ast_xml_get_attribute(node, "required");
        if (paramtype) {
            required = ast_true(paramtype);
            ast_xml_free_attr(paramtype);
        }
 
        /* Is this a replaceable value or a fixed parameter value? */
        isliteral = 0;
        literal = ast_xml_get_attribute(node, "literal");
        if (literal) {
            isliteral = ast_true(literal);
            ast_xml_free_attr(literal);
        }
 
        /* if required="false" print with [...].
         * if literal="true" or is enum print without <..>.
         * if not first print a space at the beginning.
         */
        ast_str_append(&syntax, 0, "%s%s%s%s%s%s",
                (first ? "" : " "),
                (required ? "" : "["),
                (isenum || isliteral ? "" : "<"),
                paramname,
                (isenum || isliteral ? "" : ">"),
                (required ? "" : "]"));
        first = 0;
        ast_free(paramname);
    }
 
    /* return a common string. */
    ret = ast_strdup(ast_str_buffer(syntax));
    ast_free(syntax);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Generate an AMI action/event syntax.
 *
 * \param fixnode The manager action/event node pointer.
 * \param name The name of the manager action/event.
 * \param manager_type "Action" or "Event"
 *
 * \retval The generated syntax.
 * \retval NULL on error.
 */
static char *xmldoc_get_syntax_manager(struct ast_xml_node *fixnode, const char *name, const char *manager_type)
{
    struct ast_str *syntax;
    struct ast_xml_node *node = fixnode;
    const char *paramtype, *attrname;
    int required;
    char *ret;
 
    if (!fixnode) {
        return NULL;
    }
 
    syntax = ast_str_create(128);
    if (!syntax) {
        return ast_strdup(name);
    }
 
    ast_str_append(&syntax, 0, "%s: %s", manager_type, name);
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (strcasecmp(ast_xml_node_get_name(node), "parameter")) {
            continue;
        }
 
        /* Is this parameter required? */
        required = !strcasecmp(manager_type, "event") ? 1 : 0;
        paramtype = ast_xml_get_attribute(node, "required");
        if (paramtype) {
            required = ast_true(paramtype);
            ast_xml_free_attr(paramtype);
        }
 
        attrname = ast_xml_get_attribute(node, "name");
        if (!attrname) {
            /* ignore this bogus parameter and continue. */
            continue;
        }
 
        ast_str_append(&syntax, 0, "\n%s%s:%s <value>",
            (required ? "" : "["),
            attrname,
            (required ? "" : "]"));
        ast_xml_free_attr(attrname);
    }
 
    /* return a common string. */
    ret = ast_strdup(ast_str_buffer(syntax));
    ast_free(syntax);
 
    return ret;
}
 
static char *xmldoc_get_syntax_config_object(struct ast_xml_node *fixnode, const char *name)
{
    struct ast_xml_node *matchinfo, *tmp;
    int match;
    const char *attr_value;
    const char *text;
    RAII_VAR(struct ast_str *, syntax, ast_str_create(128), ast_free);
 
    if (!syntax || !fixnode) {
        return NULL;
    }
    if (!(matchinfo = ast_xml_find_element(ast_xml_node_get_children(fixnode), "matchInfo", NULL, NULL))) {
        return NULL;
    }
    if (!(tmp  = ast_xml_find_element(ast_xml_node_get_children(matchinfo), "category", NULL, NULL))) {
        return NULL;
    }
    attr_value = ast_xml_get_attribute(tmp, "match");
    if (attr_value) {
        match = ast_true(attr_value);
        text = ast_xml_get_text(tmp);
        ast_str_set(&syntax, 0, "category %s /%s/", match ? "=~" : "!~", text);
        ast_xml_free_attr(attr_value);
        ast_xml_free_text(text);
    }
 
    if ((tmp = ast_xml_find_element(ast_xml_node_get_children(matchinfo), "field", NULL, NULL))) {
        text = ast_xml_get_text(tmp);
        attr_value = ast_xml_get_attribute(tmp, "name");
        ast_str_append(&syntax, 0, " matchfield: %s = %s", S_OR(attr_value, "Unknown"), text);
        ast_xml_free_attr(attr_value);
        ast_xml_free_text(text);
    }
    return ast_strdup(ast_str_buffer(syntax));
}
 
static char *xmldoc_get_syntax_config_option(struct ast_xml_node *fixnode, const char *name)
{
    const char *type;
    const char *default_value;
    const char *regex;
    RAII_VAR(struct ast_str *, syntax, ast_str_create(128), ast_free);
 
    if (!syntax || !fixnode) {
        return NULL;
    }
    type = ast_xml_get_attribute(fixnode, "type");
    default_value = ast_xml_get_attribute(fixnode, "default");
 
    regex = ast_xml_get_attribute(fixnode, "regex");
    ast_str_set(&syntax, 0, "%s = [%s] (Default: %s) (Regex: %s)\n",
        name,
        type ?: "",
        default_value ?: "n/a",
        regex ?: "False");
 
    ast_xml_free_attr(type);
    ast_xml_free_attr(default_value);
    ast_xml_free_attr(regex);
 
    return ast_strdup(ast_str_buffer(syntax));
}
 
/*! \brief Types of syntax that we are able to generate. */
enum syntaxtype {
    FUNCTION_SYNTAX,
    MANAGER_SYNTAX,
    MANAGER_EVENT_SYNTAX,
    CONFIG_INFO_SYNTAX,
    CONFIG_FILE_SYNTAX,
    CONFIG_OPTION_SYNTAX,
    CONFIG_OBJECT_SYNTAX,
    COMMAND_SYNTAX
};
 
/*! \brief Mapping between type of node and type of syntax to generate. */
static struct strsyntaxtype {
    const char *type;
    enum syntaxtype stxtype;
} stxtype[] = {
    { "function",     FUNCTION_SYNTAX      },
    { "application",  FUNCTION_SYNTAX      },
    { "manager",      MANAGER_SYNTAX       },
    { "managerEvent", MANAGER_EVENT_SYNTAX },
    { "configInfo",   CONFIG_INFO_SYNTAX   },
    { "configFile",   CONFIG_FILE_SYNTAX   },
    { "configOption", CONFIG_OPTION_SYNTAX },
    { "configObject", CONFIG_OBJECT_SYNTAX },
    { "agi",          COMMAND_SYNTAX       },
};
 
/*!
 * \internal
 * \brief Get syntax type based on type of node.
 *
 * \param type Type of node.
 *
 * \retval The type of syntax to generate based on the type of node.
 */
static enum syntaxtype xmldoc_get_syntax_type(const char *type)
{
    int i;
    for (i=0; i < ARRAY_LEN(stxtype); i++) {
        if (!strcasecmp(stxtype[i].type, type)) {
            return stxtype[i].stxtype;
        }
    }
 
    return FUNCTION_SYNTAX;
}
 
/*!
 * \internal
 * \brief Build syntax information for an item
 * \param root_node The syntax node to parse
 * \param type      The source type
 * \param name      The name of the item that the syntax describes
 *
 * \note This method exists for when you already have the node.  This
 * prevents having to lock the documentation tree twice
 *
 * \retval A malloc'd character pointer to the syntax of the item
 * \retval NULL on failure
 *
 * \since 11
 */
static char *_ast_xmldoc_build_syntax(struct ast_xml_node *root_node, const char *type, const char *name)
{
    char *syntax = NULL;
    struct ast_xml_node *node = root_node;
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (!strcasecmp(ast_xml_node_get_name(node), "syntax")) {
            break;
        }
    }
 
    switch (xmldoc_get_syntax_type(type)) {
    case FUNCTION_SYNTAX:
        syntax = xmldoc_get_syntax_fun(node, name, "parameter", 1, 1);
        break;
    case COMMAND_SYNTAX:
        syntax = xmldoc_get_syntax_cmd(node, name, 1);
        break;
    case MANAGER_SYNTAX:
        syntax = xmldoc_get_syntax_manager(node, name, "Action");
        break;
    case MANAGER_EVENT_SYNTAX:
        syntax = xmldoc_get_syntax_manager(node, name, "Event");
        break;
    case CONFIG_OPTION_SYNTAX:
        syntax = xmldoc_get_syntax_config_option(root_node, name);
        break;
    case CONFIG_OBJECT_SYNTAX:
        syntax = xmldoc_get_syntax_config_object(node, name);
        break;
    default:
        syntax = xmldoc_get_syntax_fun(node, name, "parameter", 1, 1);
    }
 
    return syntax;
}
 
char *ast_xmldoc_build_syntax(const char *type, const char *name, const char *module)
{
    struct ast_xml_node *node;
    char *syntax;
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    node = xmldoc_get_node(type, name, module, documentation_language);
    if (!node) {
        AST_RWLIST_UNLOCK(&xmldoc_tree);
        return NULL;
    }
 
    syntax = _ast_xmldoc_build_syntax(node, type, name);
    AST_RWLIST_UNLOCK(&xmldoc_tree);
    return syntax;
}
 
/*!
 * \internal
 * \brief Parse common internal elements.  This includes paragraphs, special
 *        tags, and information nodes.
 *
 * \param node The element to parse
 * \param tabs Add this string before the content of the parsed element.
 * \param posttabs Add this string after the content of the parsed element.
 * \param buffer This must be an already allocated ast_str. It will be used to
 *               store the result (if something has already been placed in the
 *               buffer, the parsed elements will be appended)
 *
 * \retval 1 if any data was appended to the buffer
 * \retval 2 if the data appended to the buffer contained a text paragraph
 * \retval 0 if no data was appended to the buffer
 */
static int xmldoc_parse_common_elements(struct ast_xml_node *node, const char *tabs, const char *posttabs, struct ast_str **buffer)
{
    return (xmldoc_parse_para(node, tabs, posttabs, buffer)
        || xmldoc_parse_specialtags(node, tabs, posttabs, buffer)
        || xmldoc_parse_info(node, tabs, posttabs, buffer));
}
 
/*!
 * \internal
 * \brief Parse a <para> element.
 *
 * \param node The <para> element pointer.
 * \param tabs Add this string before the content of the <para> element.
 * \param posttabs Added this string after the content of the <para> element.
 * \param buffer This must be an already allocated ast_str. It will be used
 *        to store the result (if already has something it will be appended to the current
 *        string).
 *
 * \retval 1 If 'node' is a named 'para'.
 * \retval 2 If data is appended in buffer.
 * \retval 0 on error.
 */
static int xmldoc_parse_para(struct ast_xml_node *node, const char *tabs, const char *posttabs, struct ast_str **buffer)
{
    const char *tmptext;
    struct ast_xml_node *tmp;
    int ret = 0;
    struct ast_str *tmpstr;
 
    if (!node || !ast_xml_node_get_children(node)) {
        return ret;
    }
 
    if (strcasecmp(ast_xml_node_get_name(node), "para")) {
        return ret;
    }
 
    ast_str_append(buffer, 0, "%s", tabs);
 
    ret = 1;
 
    for (tmp = ast_xml_node_get_children(node); tmp; tmp = ast_xml_node_get_next(tmp)) {
        /* Get the text inside the <para> element and append it to buffer. */
        tmptext = ast_xml_get_text(tmp);
        if (tmptext) {
            /* Strip \n etc. */
            xmldoc_string_cleanup(tmptext, &tmpstr, 0, 0);
            ast_xml_free_text(tmptext);
            if (tmpstr) {
                if (strcasecmp(ast_xml_node_get_name(tmp), "text")) {
                    ast_str_append(buffer, 0, "<%s>%s</%s>", ast_xml_node_get_name(tmp),
                            ast_str_buffer(tmpstr), ast_xml_node_get_name(tmp));
                } else {
                    ast_str_append(buffer, 0, "%s", ast_str_buffer(tmpstr));
                }
                ast_free(tmpstr);
                ret = 2;
            }
        }
    }
 
    ast_str_append(buffer, 0, "%s", posttabs);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Parse an <example> node.
 * \since 13.0.0
 *
 * \param fixnode An ast xml pointer to the <example> node.
 * \param buffer The output buffer.
 *
 * \retval 0 if no example node is parsed.
 * \retval 1 if an example node is parsed.
 */
static int xmldoc_parse_example(struct ast_xml_node *fixnode, struct ast_str **buffer)
{
    struct ast_xml_node *node = fixnode;
    const char *tmptext;
    const char *title;
    struct ast_str *stripped_text;
    int ret = 0;
 
    if (!node || !ast_xml_node_get_children(node)) {
        return ret;
    }
 
    if (strcasecmp(ast_xml_node_get_name(node), "example")) {
        return ret;
    }
 
    ret = 1;
 
    title = ast_xml_get_attribute(node, "title");
    if (title) {
        ast_str_append(buffer, 0, "%s", title);
        ast_xml_free_attr(title);
    }
    ast_str_append(buffer, 0, "\n");
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        tmptext = ast_xml_get_text(node);
        if (tmptext) {
            xmldoc_string_cleanup(tmptext, &stripped_text, 0, 1);
            if (stripped_text) {
                ast_str_append(buffer, 0, "<exampletext>%s</exampletext>\n", ast_str_buffer(stripped_text));
                ast_xml_free_text(tmptext);
                ast_free(stripped_text);
            }
        }
    }
 
    return ret;
}
 
/*!
 * \internal
 * \brief Parse special elements defined in 'struct special_tags' special elements must have a <para> element inside them.
 *
 * \param fixnode special tag node pointer.
 * \param tabs put tabs before printing the node content.
 * \param posttabs put posttabs after printing node content.
 * \param buffer Output buffer, the special tags will be appended here.
 *
 * \retval 0 if no special element is parsed.
 * \retval 1 if a special element is parsed (data is appended to buffer).
 * \retval 2 if a special element is parsed and also a <para> element is parsed inside the specialtag.
 */
static int xmldoc_parse_specialtags(struct ast_xml_node *fixnode, const char *tabs, const char *posttabs, struct ast_str **buffer)
{
    struct ast_xml_node *node = fixnode;
    int ret = 0, i;
 
    if (!node || !ast_xml_node_get_children(node)) {
        return ret;
    }
 
    for (i = 0; i < ARRAY_LEN(special_tags); i++) {
        if (strcasecmp(ast_xml_node_get_name(node), special_tags[i].tagname)) {
            continue;
        }
 
        ret = 1;
        /* This is a special tag. */
 
        /* concat data */
        if (!ast_strlen_zero(special_tags[i].init)) {
            ast_str_append(buffer, 0, "%s%s", tabs, special_tags[i].init);
        }
 
        if (xmldoc_parse_example(node, buffer)) {
            ret = 1;
            break;
        }
 
        /* parse <para> elements inside special tags. */
        for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
            /* first <para> just print it without tabs at the begining. */
            if ((xmldoc_parse_para(node, "", posttabs, buffer) == 2)
                || (xmldoc_parse_info(node, "", posttabs, buffer) == 2)) {
                ret = 2;
            }
        }
 
        if (!ast_strlen_zero(special_tags[i].end)) {
            ast_str_append(buffer, 0, "%s%s", special_tags[i].end, posttabs);
        }
 
        break;
    }
 
    return ret;
}
 
/*!
 * \internal
 * \brief Parse an <argument> element from the xml documentation.
 *
 * \param fixnode Pointer to the 'argument' xml node.
 * \param insideparameter If we are parsing an <argument> inside a <parameter>.
 * \param paramtabs pre tabs if we are inside a parameter element.
 * \param tabs What to be printed before the argument name.
 * \param buffer Output buffer to put values found inside the <argument> element.
 *
 * \retval 1 If there is content inside the argument.
 * \retval 0 If the argument element is not parsed, or there is no content inside it.
 */
static int xmldoc_parse_argument(struct ast_xml_node *fixnode, int insideparameter, const char *paramtabs, const char *tabs, struct ast_str **buffer)
{
    struct ast_xml_node *node = fixnode;
    const char *argname;
    int count = 0, ret = 0;
 
    if (!node || !ast_xml_node_get_children(node)) {
        return ret;
    }
 
    /* Print the argument names */
    argname = ast_xml_get_attribute(node, "name");
    if (!argname) {
        return 0;
    }
    if (xmldoc_has_inside(node, "para") || xmldoc_has_inside(node, "info") || xmldoc_has_specialtags(node)) {
        ast_str_append(buffer, 0, "%s%s%s", tabs, argname, (insideparameter ? "\n" : ""));
        ast_xml_free_attr(argname);
    } else {
        ast_xml_free_attr(argname);
        return 0;
    }
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (xmldoc_parse_common_elements(node, (insideparameter ? paramtabs : (!count ? " - " : tabs)), "\n", buffer) == 2) {
            count++;
            ret = 1;
        }
    }
 
    return ret;
}
 
/*!
 * \internal
 * \brief Parse a <variable> node inside a <variablelist> node.
 *
 * \param node The variable node to parse.
 * \param tabs A string to be appended at the begining of the output that will be stored
 *        in buffer.
 * \param buffer This must be an already created ast_str. It will be used
 *        to store the result (if already has something it will be appended to the current
 *        string).
 *
 * \retval 0 if no data is appended.
 * \retval 1 if data is appended.
 */
static int xmldoc_parse_variable(struct ast_xml_node *node, const char *tabs, struct ast_str **buffer)
{
    struct ast_xml_node *tmp;
    const char *valname;
    const char *tmptext;
    struct ast_str *cleanstr;
    int ret = 0, printedpara=0;
 
    for (tmp = ast_xml_node_get_children(node); tmp; tmp = ast_xml_node_get_next(tmp)) {
        if (xmldoc_parse_common_elements(tmp, (ret ? tabs : ""), "\n", buffer)) {
            printedpara = 1;
            continue;
        }
 
        if (strcasecmp(ast_xml_node_get_name(tmp), "value")) {
            continue;
        }
 
        /* Parse a <value> tag only. */
        if (!printedpara) {
            ast_str_append(buffer, 0, "\n");
            printedpara = 1;
        }
        /* Parse each <value name='valuename'>desciption</value> */
        valname = ast_xml_get_attribute(tmp, "name");
        if (valname) {
            ret = 1;
            ast_str_append(buffer, 0, "%s<value>%s</value>", tabs, valname);
            ast_xml_free_attr(valname);
        }
        tmptext = ast_xml_get_text(tmp);
        /* Check inside this node for any explanation about its meaning. */
        if (tmptext) {
            /* Cleanup text. */
            xmldoc_string_cleanup(tmptext, &cleanstr, 1, 0);
            ast_xml_free_text(tmptext);
            if (cleanstr && ast_str_strlen(cleanstr) > 0) {
                ast_str_append(buffer, 0, ":%s", ast_str_buffer(cleanstr));
            }
            ast_free(cleanstr);
        }
        ast_str_append(buffer, 0, "\n");
    }
 
    return ret;
}
 
/*!
 * \internal
 * \brief Parse a <variablelist> node and put all the output inside 'buffer'.
 *
 * \param node The variablelist node pointer.
 * \param tabs A string to be appended at the begining of the output that will be stored
 *        in buffer.
 * \param buffer This must be an already created ast_str. It will be used
 *        to store the result (if already has something it will be appended to the current
 *        string).
 *
 * \retval 1 If a <variablelist> element is parsed.
 * \retval 0 On error.
 */
static int xmldoc_parse_variablelist(struct ast_xml_node *node, const char *tabs, struct ast_str **buffer)
{
    struct ast_xml_node *tmp;
    const char *varname;
    char *vartabs;
    int ret = 0;
 
    if (!node || !ast_xml_node_get_children(node)) {
        return ret;
    }
 
    if (strcasecmp(ast_xml_node_get_name(node), "variablelist")) {
        return ret;
    }
 
    /* use this spacing (add 4 spaces) inside a variablelist node. */
    if (ast_asprintf(&vartabs, "%s    ", tabs) < 0) {
        return ret;
    }
    for (tmp = ast_xml_node_get_children(node); tmp; tmp = ast_xml_node_get_next(tmp)) {
        /* We can have a <para> element inside the variable list */
        if (xmldoc_parse_common_elements(tmp, (ret ? tabs : ""), "\n", buffer)) {
            ret = 1;
            continue;
        }
 
        if (!strcasecmp(ast_xml_node_get_name(tmp), "variable")) {
            /* Store the variable name in buffer. */
            varname = ast_xml_get_attribute(tmp, "name");
            if (varname) {
                ast_str_append(buffer, 0, "%s<variable>%s</variable>: ", tabs, varname);
                ast_xml_free_attr(varname);
                /* Parse the <variable> possible values. */
                xmldoc_parse_variable(tmp, vartabs, buffer);
                ret = 1;
            }
        }
    }
 
    ast_free(vartabs);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Build seealso information for an item
 *
 * \param node  The seealso node to parse
 *
 * \note This method exists for when you already have the node.  This
 * prevents having to lock the documentation tree twice
 *
 * \retval A malloc'd character pointer to the seealso information of the item
 * \retval NULL on failure
 *
 * \since 11
 */
static char *_ast_xmldoc_build_seealso(struct ast_xml_node *node)
{
    char *output;
    struct ast_str *outputstr;
    const char *typename;
    const char *content;
    int first = 1;
 
    /* Find the <see-also> node. */
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (!strcasecmp(ast_xml_node_get_name(node), "see-also")) {
            break;
        }
    }
 
    if (!node || !ast_xml_node_get_children(node)) {
        /* we couldnt find a <see-also> node. */
        return NULL;
    }
 
    /* prepare the output string. */
    outputstr = ast_str_create(128);
    if (!outputstr) {
        return NULL;
    }
 
    /* get into the <see-also> node. */
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (strcasecmp(ast_xml_node_get_name(node), "ref")) {
            continue;
        }
 
        /* parse the <ref> node. 'type' attribute is required. */
        typename = ast_xml_get_attribute(node, "type");
        if (!typename) {
            continue;
        }
        content = ast_xml_get_text(node);
        if (!content) {
            ast_xml_free_attr(typename);
            continue;
        }
        if (!strcasecmp(typename, "application")) {
            ast_str_append(&outputstr, 0, "%s%s()", (first ? "" : ", "), content);
        } else if (!strcasecmp(typename, "function")) {
            ast_str_append(&outputstr, 0, "%s%s", (first ? "" : ", "), content);
        } else if (!strcasecmp(typename, "astcli")) {
            ast_str_append(&outputstr, 0, "%s<astcli>%s</astcli>", (first ? "" : ", "), content);
        } else {
            ast_str_append(&outputstr, 0, "%s%s", (first ? "" : ", "), content);
        }
        first = 0;
        ast_xml_free_text(content);
        ast_xml_free_attr(typename);
    }
 
    output = ast_strdup(ast_str_buffer(outputstr));
    ast_free(outputstr);
 
    return output;
}
 
char *ast_xmldoc_build_seealso(const char *type, const char *name, const char *module)
{
    char *output;
    struct ast_xml_node *node;
 
    if (ast_strlen_zero(type) || ast_strlen_zero(name)) {
        return NULL;
    }
 
    /* get the application/function root node. */
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    node = xmldoc_get_node(type, name, module, documentation_language);
    if (!node || !ast_xml_node_get_children(node)) {
        AST_RWLIST_UNLOCK(&xmldoc_tree);
        return NULL;
    }
 
    output = _ast_xmldoc_build_seealso(node);
    AST_RWLIST_UNLOCK(&xmldoc_tree);
 
    return output;
}
 
/*!
 * \internal
 * \brief Parse a <enum> node.
 *
 * \param fixnode An ast_xml_node pointer to the <enum> node.
 * \param tabs    Add this string before the content of the <enum> node.
 * \param buffer  The output buffer.
 *
 * \retval 0 if content is not found inside the enum element (data is not appended to buffer).
 * \retval 1 if content is found and data is appended to buffer.
 */
static int xmldoc_parse_enum(struct ast_xml_node *fixnode, const char *tabs, struct ast_str **buffer)
{
    struct ast_xml_node *node = fixnode;
    int ret = 0;
    char *optiontabs;
 
    if (ast_asprintf(&optiontabs, "%s    ", tabs) < 0) {
        return ret;
    }
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (xmldoc_parse_common_elements(node, (ret ? tabs : " - "), "\n", buffer)) {
            ret = 1;
        }
 
        xmldoc_parse_enumlist(node, optiontabs, buffer);
        xmldoc_parse_parameter(node, optiontabs, buffer);
    }
 
    ast_free(optiontabs);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Parse a <enumlist> node.
 *
 * \param fixnode As ast_xml pointer to the <enumlist> node.
 * \param tabs    Add this string before the content of the <enumlist> node.
 * \param buffer  The ast_str output buffer.
 *
 * \retval 0 if no <enumlist> node was parsed.
 * \retval 1 if a <enumlist> node was parsed.
 */
static int xmldoc_parse_enumlist(struct ast_xml_node *fixnode, const char *tabs, struct ast_str **buffer)
{
    struct ast_xml_node *node = fixnode;
    const char *enumname;
    int ret = 0;
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (strcasecmp(ast_xml_node_get_name(node), "enum")) {
            continue;
        }
 
        enumname = ast_xml_get_attribute(node, "name");
        if (enumname) {
            ast_str_append(buffer, 0, "%s<enum>%s</enum>", tabs, enumname);
            ast_xml_free_attr(enumname);
 
            /* parse only enum elements inside a enumlist node. */
            if ((xmldoc_parse_enum(node, tabs, buffer))) {
                ret = 1;
            } else {
                ast_str_append(buffer, 0, "\n");
            }
        }
    }
    return ret;
}
 
/*!
 * \internal
 * \brief Parse an <option> node.
 *
 * \param fixnode An ast_xml pointer to the <option> node.
 * \param tabs A string to be appended at the begining of each line being added to the
 *             buffer string.
 * \param buffer The output buffer.
 *
 * \retval 0 if no option node is parsed.
 * \retval 1 if an option node is parsed.
 */
static int xmldoc_parse_option(struct ast_xml_node *fixnode, const char *tabs, struct ast_str **buffer)
{
    struct ast_xml_node *node;
    int ret = 0;
    char *optiontabs;
 
    if (ast_asprintf(&optiontabs, "%s    ", tabs) < 0) {
        return ret;
    }
    for (node = ast_xml_node_get_children(fixnode); node; node = ast_xml_node_get_next(node)) {
        if (!strcasecmp(ast_xml_node_get_name(node), "argument")) {
            /* if this is the first data appended to buffer, print a \n*/
            if (!ret && ast_xml_node_get_children(node)) {
                /* print \n */
                ast_str_append(buffer, 0, "\n");
            }
            if (xmldoc_parse_argument(node, 0, NULL, optiontabs, buffer)) {
                ret = 1;
            }
            continue;
        }
 
        if (xmldoc_parse_common_elements(node, (ret ? tabs :  ""), "\n", buffer)) {
            ret = 1;
        }
 
        xmldoc_parse_variablelist(node, optiontabs, buffer);
 
        xmldoc_parse_enumlist(node, optiontabs, buffer);
    }
    ast_free(optiontabs);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Parse an <optionlist> element from the xml documentation.
 *
 * \param fixnode Pointer to the optionlist xml node.
 * \param tabs A string to be appended at the begining of each line being added to the
 *             buffer string.
 * \param buffer Output buffer to put what is inside the optionlist tag.
 */
static void xmldoc_parse_optionlist(struct ast_xml_node *fixnode, const char *tabs, struct ast_str **buffer)
{
    struct ast_xml_node *node;
    const char *optname, *hasparams;
    char *optionsyntax;
    int optparams;
 
    for (node = ast_xml_node_get_children(fixnode); node; node = ast_xml_node_get_next(node)) {
        /* Start appending every option tag. */
        if (strcasecmp(ast_xml_node_get_name(node), "option")) {
            continue;
        }
 
        /* Get the option name. */
        optname = ast_xml_get_attribute(node, "name");
        if (!optname) {
            continue;
        }
 
        optparams = 1;
        hasparams = ast_xml_get_attribute(node, "hasparams");
        if (hasparams && !strcasecmp(hasparams, "optional")) {
            optparams = 2;
        }
 
        optionsyntax = xmldoc_get_syntax_fun(node, optname, "argument", 0, optparams);
        if (!optionsyntax) {
            ast_xml_free_attr(optname);
            ast_xml_free_attr(hasparams);
            continue;
        }
 
        ast_str_append(buffer, 0, "%s%s: ", tabs, optionsyntax);
 
        if (!xmldoc_parse_option(node, tabs, buffer)) {
            ast_str_append(buffer, 0, "\n");
        }
        ast_str_append(buffer, 0, "\n");
        ast_xml_free_attr(optname);
        ast_xml_free_attr(hasparams);
        ast_free(optionsyntax);
    }
}
 
/*!
 * \internal
 * \brief Parse a 'parameter' tag inside a syntax element.
 *
 * \param fixnode A pointer to the 'parameter' xml node.
 * \param tabs A string to be appended at the beginning of each line being printed inside
 *             'buffer'.
 * \param buffer String buffer to put values found inside the parameter element.
 */
static void xmldoc_parse_parameter(struct ast_xml_node *fixnode, const char *tabs, struct ast_str **buffer)
{
    const char *paramname;
    struct ast_xml_node *node = fixnode;
    int hasarguments, printed = 0;
    char *internaltabs;
 
    if (strcasecmp(ast_xml_node_get_name(node), "parameter")) {
        return;
    }
 
    hasarguments = xmldoc_has_inside(node, "argument");
    if (!(paramname = ast_xml_get_attribute(node, "name"))) {
        /* parameter MUST have an attribute name. */
        return;
    }
 
    if (ast_asprintf(&internaltabs, "%s    ", tabs) < 0) {
        ast_xml_free_attr(paramname);
        return;
    }
 
    if (!hasarguments && xmldoc_has_nodes(node)) {
        ast_str_append(buffer, 0, "%s\n", paramname);
        ast_xml_free_attr(paramname);
        printed = 1;
    }
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (!strcasecmp(ast_xml_node_get_name(node), "optionlist")) {
            xmldoc_parse_optionlist(node, internaltabs, buffer);
        } else if (!strcasecmp(ast_xml_node_get_name(node), "enumlist")) {
            xmldoc_parse_enumlist(node, internaltabs, buffer);
        } else if (!strcasecmp(ast_xml_node_get_name(node), "argument")) {
            xmldoc_parse_argument(node, 1, internaltabs, (!hasarguments ? "        " : ""), buffer);
        } else if (!strcasecmp(ast_xml_node_get_name(node), "para")) {
            if (!printed) {
                ast_str_append(buffer, 0, "%s\n", paramname);
                ast_xml_free_attr(paramname);
                printed = 1;
            }
            if (xmldoc_parse_para(node, internaltabs, "\n", buffer)) {
                /* If anything ever goes in below this condition before the continue below,
                 * we should probably continue immediately. */
                continue;
            }
            continue;
        } else if (!strcasecmp(ast_xml_node_get_name(node), "info")) {
            if (!printed) {
                ast_str_append(buffer, 0, "%s\n", paramname);
                ast_xml_free_attr(paramname);
                printed = 1;
            }
            if (xmldoc_parse_info(node, internaltabs, "\n", buffer)) {
                /* If anything ever goes in below this condition before the continue below,
                 * we should probably continue immediately. */
                continue;
            }
            continue;
        } else if ((xmldoc_parse_specialtags(node, internaltabs, "\n", buffer))) {
            continue;
        }
    }
    if (!printed) {
        ast_xml_free_attr(paramname);
    }
    ast_free(internaltabs);
}
 
/*!
 * \internal
 * \brief Parse an 'info' tag inside an element.
 *
 * \param node A pointer to the 'info' xml node.
 * \param tabs A string to be appended at the beginning of each line being printed
 *             inside 'buffer'.
 * \param posttabs Add this string after the content of the <para> element, if one exists
 * \param buffer   String buffer to put values found inide the info element.
 *
 * \retval 2 if the information contained a para element, and it returned a value of 2
 * \retval 1 if information was put into the buffer
 * \retval 0 if no information was put into the buffer or error
 */
static int xmldoc_parse_info(struct ast_xml_node *node, const char *tabs, const char *posttabs, struct ast_str **buffer)
{
    const char *tech;
    char *internaltabs;
    int internal_ret;
    int ret = 0;
 
    if (strcasecmp(ast_xml_node_get_name(node), "info")) {
        return ret;
    }
 
    ast_asprintf(&internaltabs, "%s    ", tabs);
    if (!internaltabs) {
        return ret;
    }
 
    tech = ast_xml_get_attribute(node, "tech");
    if (tech) {
        ast_str_append(buffer, 0, "%s<note>Technology: %s</note>\n", internaltabs, tech);
        ast_xml_free_attr(tech);
    }
 
    ret = 1;
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (!strcasecmp(ast_xml_node_get_name(node), "enumlist")) {
            xmldoc_parse_enumlist(node, internaltabs, buffer);
        } else if (!strcasecmp(ast_xml_node_get_name(node), "parameter")) {
            xmldoc_parse_parameter(node, internaltabs, buffer);
        } else if ((internal_ret = xmldoc_parse_common_elements(node, internaltabs, posttabs, buffer))) {
            if (internal_ret > ret) {
                ret = internal_ret;
            }
        }
    }
    ast_free(internaltabs);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Build the arguments for an item
 *
 * \param node  The arguments node to parse
 *
 * \note This method exists for when you already have the node.  This
 * prevents having to lock the documentation tree twice
 *
 * \retval A malloc'd character pointer to the arguments for the item
 * \retval NULL on failure
 *
 * \since 11
 */
static char *_ast_xmldoc_build_arguments(struct ast_xml_node *node)
{
    char *retstr = NULL;
    struct ast_str *ret;
 
    ret = ast_str_create(128);
    if (!ret) {
        return NULL;
    }
 
    /* Find the syntax field. */
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        if (!strcasecmp(ast_xml_node_get_name(node), "syntax")) {
            break;
        }
    }
 
    if (!node || !ast_xml_node_get_children(node)) {
        /* We couldn't find the syntax node. */
        ast_free(ret);
        return NULL;
    }
 
    for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
        xmldoc_parse_parameter(node, "", &ret);
    }
 
    if (ast_str_strlen(ret) > 0) {
        /* remove last '\n' */
        char *buf = ast_str_buffer(ret);
        if (buf[ast_str_strlen(ret) - 1] == '\n') {
            ast_str_truncate(ret, -1);
        }
        retstr = ast_strdup(ast_str_buffer(ret));
    }
    ast_free(ret);
 
    return retstr;
}
 
char *ast_xmldoc_build_arguments(const char *type, const char *name, const char *module)
{
    struct ast_xml_node *node;
    char *arguments;
 
    if (ast_strlen_zero(type) || ast_strlen_zero(name)) {
        return NULL;
    }
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    node = xmldoc_get_node(type, name, module, documentation_language);
 
    if (!node || !ast_xml_node_get_children(node)) {
        AST_RWLIST_UNLOCK(&xmldoc_tree);
        return NULL;
    }
 
    arguments = _ast_xmldoc_build_arguments(node);
    AST_RWLIST_UNLOCK(&xmldoc_tree);
    return arguments;
}
 
/*!
 * \internal
 * \brief Return the string within a node formatted with <para> and <variablelist> elements.
 *
 * \param node       Parent node where content resides.
 * \param raw_output If set, return the node's content without further processing.
 * \param raw_wrap   Wrap raw text.
 *
 * \retval NULL on error
 * \retval Node content on success.
 */
static struct ast_str *xmldoc_get_formatted(struct ast_xml_node *node, int raw_output, int raw_wrap)
{
    struct ast_xml_node *tmp;
    const char *notcleanret, *tmpstr;
    struct ast_str *ret;
 
    if (raw_output) {
        /* xmldoc_string_cleanup will allocate the ret object */
        notcleanret = ast_xml_get_text(node);
        tmpstr = notcleanret;
        xmldoc_string_cleanup(ast_skip_blanks(notcleanret), &ret, 0, 0);
        ast_xml_free_text(tmpstr);
    } else {
        ret = ast_str_create(128);
        if (!ret) {
            return NULL;
        }
        for (tmp = ast_xml_node_get_children(node); tmp; tmp = ast_xml_node_get_next(tmp)) {
            /* if found, parse children elements. */
            if (xmldoc_parse_common_elements(tmp, "", "\n", &ret)) {
                continue;
            }
            if (xmldoc_parse_variablelist(tmp, "", &ret)) {
                continue;
            }
            if (xmldoc_parse_enumlist(tmp, "    ", &ret)) {
                continue;
            }
            if (xmldoc_parse_specialtags(tmp, "", "", &ret)) {
                continue;
            }
        }
        /* remove last '\n' */
        /* XXX Don't modify ast_str internals manually */
        tmpstr = ast_str_buffer(ret);
        if (tmpstr[ast_str_strlen(ret) - 1] == '\n') {
            ast_str_truncate(ret, -1);
        }
    }
    return ret;
}
 
/*!
 * \internal
 * \brief Get the content of a field (synopsis, description, etc) from an asterisk document tree node
 *
 * \param node The node to obtain the information from
 * \param var Name of field to return (synopsis, description, etc).
 * \param raw Field only contains text, no other elements inside it.
 *
 * \retval NULL On error.
 * \retval Field text content on success.
 * \since 11
 */
static char *_xmldoc_build_field(struct ast_xml_node *node, const char *var, int raw)
{
    char *ret = NULL;
    struct ast_str *formatted;
 
    node = ast_xml_find_element(ast_xml_node_get_children(node), var, NULL, NULL);
 
    if (!node || !ast_xml_node_get_children(node)) {
        return ret;
    }
 
    formatted = xmldoc_get_formatted(node, raw, raw);
    if (formatted && ast_str_strlen(formatted) > 0) {
        ret = ast_strdup(ast_str_buffer(formatted));
    }
    ast_free(formatted);
 
    return ret;
}
 
/*!
 * \internal
 * \brief Get the content of a field (synopsis, description, etc) from an asterisk document tree
 *
 * \param type Type of element (application, function, ...).
 * \param name Name of element (Dial, Echo, Playback, ...).
 * \param var Name of field to return (synopsis, description, etc).
 * \param module
 * \param raw Field only contains text, no other elements inside it.
 *
 * \retval NULL On error.
 * \retval Field text content on success.
 */
static char *xmldoc_build_field(const char *type, const char *name, const char *module, const char *var, int raw)
{
    struct ast_xml_node *node;
    char *field;
 
    if (ast_strlen_zero(type) || ast_strlen_zero(name)) {
        ast_log(LOG_ERROR, "Tried to look in XML tree with faulty values.\n");
        return NULL;
    }
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    node = xmldoc_get_node(type, name, module, documentation_language);
 
    if (!node) {
        AST_RWLIST_UNLOCK(&xmldoc_tree);
        ast_log(LOG_WARNING, "Couldn't find %s %s in XML documentation"
            " If this module was recently built, run 'xmldoc reload' to refresh documentation\n",
            type, name);
        return NULL;
    }
 
    field = _xmldoc_build_field(node, var, raw);
    AST_RWLIST_UNLOCK(&xmldoc_tree);
    return field;
}
 
/*!
 * \internal
 * \brief Build the synopsis for an item
 *
 * \param node The synopsis node
 *
 * \note This method exists for when you already have the node.  This
 * prevents having to lock the documentation tree twice
 *
 * \retval A malloc'd character pointer to the synopsis information
 * \retval NULL on failure
 * \since 11
 */
static char *_ast_xmldoc_build_synopsis(struct ast_xml_node *node)
{
    return _xmldoc_build_field(node, "synopsis", 1);
}
 
char *ast_xmldoc_build_synopsis(const char *type, const char *name, const char *module)
{
    return xmldoc_build_field(type, name, module, "synopsis", 1);
}
 
/*!
 * \internal
 * \brief Build the descripton for an item
 *
 * \param node  The description node to parse
 *
 * \note This method exists for when you already have the node.  This
 * prevents having to lock the documentation tree twice
 *
 * \retval A malloc'd character pointer to the arguments for the item
 * \retval NULL on failure
 * \since 11
 */
static char *_ast_xmldoc_build_description(struct ast_xml_node *node)
{
    return _xmldoc_build_field(node, "description", 0);
}
 
char *ast_xmldoc_build_description(const char *type, const char *name, const char *module)
{
    return xmldoc_build_field(type, name, module, "description", 0);
}
 
/*!
 * \internal
 * \brief ast_xml_doc_item ao2 destructor
 * \since 11
 */
static void ast_xml_doc_item_destructor(void *obj)
{
    struct ast_xml_doc_item *doc = obj;
 
    if (!doc) {
        return;
    }
 
    ast_free(doc->syntax);
    ast_free(doc->seealso);
    ast_free(doc->arguments);
    ast_free(doc->synopsis);
    ast_free(doc->description);
    ast_string_field_free_memory(doc);
 
    if (AST_LIST_NEXT(doc, next)) {
        ao2_ref(AST_LIST_NEXT(doc, next), -1);
        AST_LIST_NEXT(doc, next) = NULL;
    }
}
 
/*!
 * \internal
 * \brief Create an ao2 ref counted ast_xml_doc_item
 *
 * \param name The name of the item
 * \param type The item's source type
 * \since 11
 */
static struct ast_xml_doc_item *ast_xml_doc_item_alloc(const char *name, const char *type)
{
    struct ast_xml_doc_item *item;
 
    item = ao2_alloc_options(sizeof(*item), ast_xml_doc_item_destructor,
        AO2_ALLOC_OPT_LOCK_NOLOCK);
    if (!item) {
        ast_log(AST_LOG_ERROR, "Failed to allocate memory for ast_xml_doc_item instance\n");
        return NULL;
    }
 
    if (   !(item->syntax = ast_str_create(128))
        || !(item->seealso = ast_str_create(128))
        || !(item->arguments = ast_str_create(128))
        || !(item->synopsis = ast_str_create(128))
        || !(item->description = ast_str_create(128))) {
        ast_log(AST_LOG_ERROR, "Failed to allocate strings for ast_xml_doc_item instance\n");
        goto ast_xml_doc_item_failure;
    }
 
    if (ast_string_field_init(item, 64)) {
        ast_log(AST_LOG_ERROR, "Failed to initialize string field for ast_xml_doc_item instance\n");
        goto ast_xml_doc_item_failure;
    }
    ast_string_field_set(item, name, name);
    ast_string_field_set(item, type, type);
 
    return item;
 
ast_xml_doc_item_failure:
    ao2_ref(item, -1);
    return NULL;
}
 
/*!
 * \internal
 * \brief ao2 item hash function for ast_xml_doc_item
 * \since 11
 */
static int ast_xml_doc_item_hash(const void *obj, const int flags)
{
    const struct ast_xml_doc_item *item = obj;
    const char *name = (flags & OBJ_KEY) ? obj : item->name;
    return ast_str_case_hash(name);
}
 
/*!
 * \internal
 * \brief ao2 item comparison function for ast_xml_doc_item
 * \since 11
 */
static int ast_xml_doc_item_cmp(void *obj, void *arg, int flags)
{
    struct ast_xml_doc_item *left = obj;
    struct ast_xml_doc_item *right = arg;
    const char *match = (flags & OBJ_KEY) ? arg : right->name;
    return strcasecmp(left->name, match) ? 0 : (CMP_MATCH | CMP_STOP);
}
 
/*!
 * \internal
 * \brief Build an XML documentation item
 *
 * \param node The root node for the item
 * \param name The name of the item
 * \param type The item's source type
 *
 * \retval NULL on failure
 * \retval An ao2 ref counted object
 * \since 11
 */
static struct ast_xml_doc_item *xmldoc_build_documentation_item(struct ast_xml_node *node, const char *name, const char *type)
{
    struct ast_xml_doc_item *item;
    char *syntax;
    char *seealso;
    char *arguments;
    char *synopsis;
    char *description;
 
    if (!(item = ast_xml_doc_item_alloc(name, type))) {
        return NULL;
    }
    item->node = node;
 
    syntax = _ast_xmldoc_build_syntax(node, type, name);
    seealso = _ast_xmldoc_build_seealso(node);
    arguments = _ast_xmldoc_build_arguments(node);
    synopsis = _ast_xmldoc_build_synopsis(node);
    description = _ast_xmldoc_build_description(node);
 
    if (syntax) {
        ast_str_set(&item->syntax, 0, "%s", syntax);
    }
    if (seealso) {
        ast_str_set(&item->seealso, 0, "%s", seealso);
    }
    if (arguments) {
        ast_str_set(&item->arguments, 0, "%s", arguments);
    }
    if (synopsis) {
        ast_str_set(&item->synopsis, 0, "%s", synopsis);
    }
    if (description) {
        ast_str_set(&item->description, 0, "%s", description);
    }
 
    ast_free(syntax);
    ast_free(seealso);
    ast_free(arguments);
    ast_free(synopsis);
    ast_free(description);
 
    return item;
}
 
/*!
 * \internal
 * \brief Build the list responses for an item
 *
 * \param manager_action The action node to parse
 *
 * \note This method exists for when you already have the node.  This
 * prevents having to lock the documentation tree twice
 *
 * \retval A list of ast_xml_doc_items
 * \retval NULL on failure
 *
 * \since 13.0.0
 */
static struct ast_xml_doc_item *xmldoc_build_list_responses(struct ast_xml_node *manager_action)
{
    struct ast_xml_node *event;
    struct ast_xml_node *responses;
    struct ast_xml_node *list_elements;
    struct ast_xml_doc_item_list root;
 
    AST_LIST_HEAD_INIT(&root);
 
    responses = ast_xml_find_element(ast_xml_node_get_children(manager_action), "responses", NULL, NULL);
    if (!responses) {
        return NULL;
    }
 
    list_elements = ast_xml_find_element(ast_xml_node_get_children(responses), "list-elements", NULL, NULL);
    if (!list_elements) {
        return NULL;
    }
 
    /* Iterate over managerEvent nodes */
    for (event = ast_xml_node_get_children(list_elements); event; event = ast_xml_node_get_next(event)) {
        struct ast_xml_node *event_instance;
        RAII_VAR(const char *, name, ast_xml_get_attribute(event, "name"),
            ast_xml_free_attr);
        struct ast_xml_doc_item *new_item;
 
        if (!name || strcmp(ast_xml_node_get_name(event), "managerEvent")) {
            continue;
        }
 
        event_instance = ast_xml_find_element(ast_xml_node_get_children(event),
            "managerEventInstance", NULL, NULL);
        new_item = xmldoc_build_documentation_item(event_instance, name, "managerEvent");
        if (!new_item) {
            ao2_cleanup(AST_LIST_FIRST(&root));
            return NULL;
        }
 
        AST_LIST_INSERT_TAIL(&root, new_item, next);
    }
 
    return AST_LIST_FIRST(&root);
}
 
struct ast_xml_doc_item *ast_xmldoc_build_list_responses(const char *type, const char *name, const char *module)
{
    struct ast_xml_node *node;
    struct ast_xml_doc_item *responses;
 
    if (ast_strlen_zero(type) || ast_strlen_zero(name)) {
        return NULL;
    }
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    node = xmldoc_get_node(type, name, module, documentation_language);
 
    if (!node || !ast_xml_node_get_children(node)) {
        AST_RWLIST_UNLOCK(&xmldoc_tree);
        return NULL;
    }
 
    responses = xmldoc_build_list_responses(node);
    AST_RWLIST_UNLOCK(&xmldoc_tree);
    return responses;
}
 
/*!
 * \internal
 * \brief Build the final response for an item
 *
 * \param manager_action The action node to parse
 *
 * \note This method exists for when you already have the node.  This
 * prevents having to lock the documentation tree twice
 *
 * \retval An ast_xml_doc_item
 * \retval NULL on failure
 *
 * \since 13.0.0
 */
static struct ast_xml_doc_item *xmldoc_build_final_response(struct ast_xml_node *manager_action)
{
    struct ast_xml_node *responses;
    struct ast_xml_node *final_response_event;
    struct ast_xml_node *event_instance;
 
    responses = ast_xml_find_element(ast_xml_node_get_children(manager_action),
        "responses", NULL, NULL);
    if (!responses) {
        return NULL;
    }
 
    final_response_event = ast_xml_find_element(ast_xml_node_get_children(responses),
        "managerEvent", NULL, NULL);
    if (!final_response_event) {
        return NULL;
    }
 
    event_instance = ast_xml_find_element(ast_xml_node_get_children(final_response_event),
        "managerEventInstance", NULL, NULL);
    if (!event_instance) {
        return NULL;
    } else {
        const char *name;
        struct ast_xml_doc_item *res;
 
        name = ast_xml_get_attribute(final_response_event, "name");
        res = xmldoc_build_documentation_item(event_instance, name, "managerEvent");
        ast_xml_free_attr(name);
        return res;
    }
 
}
 
struct ast_xml_doc_item *ast_xmldoc_build_final_response(const char *type, const char *name, const char *module)
{
    struct ast_xml_node *node;
    static struct ast_xml_doc_item *response;
 
    if (ast_strlen_zero(type) || ast_strlen_zero(name)) {
        return NULL;
    }
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    node = xmldoc_get_node(type, name, module, documentation_language);
 
    if (!node || !ast_xml_node_get_children(node)) {
        AST_RWLIST_UNLOCK(&xmldoc_tree);
        return NULL;
    }
 
    response = xmldoc_build_final_response(node);
    AST_RWLIST_UNLOCK(&xmldoc_tree);
    return response;
}
 
struct ast_xml_xpath_results *__attribute__((format(printf, 1, 2))) ast_xmldoc_query(const char *fmt, ...)
{
    struct ast_xml_xpath_results *results = NULL;
    struct documentation_tree *doctree;
    RAII_VAR(struct ast_str *, xpath_str, ast_str_create(128), ast_free);
    va_list ap;
    int res;
 
    if (!xpath_str) {
        return NULL;
    }
 
    va_start(ap, fmt);
    res = ast_str_set_va(&xpath_str, 0, fmt, ap);
    va_end(ap);
    if (res == AST_DYNSTR_BUILD_FAILED) {
        return NULL;
    }
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    AST_LIST_TRAVERSE(&xmldoc_tree, doctree, entry) {
        if (!(results = ast_xml_query(doctree->doc, ast_str_buffer(xpath_str)))) {
            continue;
        }
        break;
    }
    AST_RWLIST_UNLOCK(&xmldoc_tree);
 
    return results;
}
 
static void build_config_docs(struct ast_xml_node *cur, struct ast_xml_doc_item_list *root)
{
    struct ast_xml_node *iter;
    struct ast_xml_doc_item *item;
 
    for (iter = ast_xml_node_get_children(cur); iter; iter = ast_xml_node_get_next(iter)) {
        const char *iter_name;
        if (strncasecmp(ast_xml_node_get_name(iter), "config", 6)) {
            continue;
        }
        iter_name = ast_xml_get_attribute(iter, "name");
        /* Now add all of the child config-related items to the list */
        if (!(item = xmldoc_build_documentation_item(iter, iter_name, ast_xml_node_get_name(iter)))) {
            ast_log(LOG_ERROR, "Could not build documentation for '%s:%s'\n", ast_xml_node_get_name(iter), iter_name);
            ast_xml_free_attr(iter_name);
            break;
        }
        ast_xml_free_attr(iter_name);
        if (!strcasecmp(ast_xml_node_get_name(iter), "configOption")) {
            const char *name = ast_xml_get_attribute(cur, "name");
            ast_string_field_set(item, ref, name);
            ast_xml_free_attr(name);
        }
        AST_LIST_INSERT_TAIL(root, item, next);
        build_config_docs(iter, root);
    }
}
 
int ast_xmldoc_regenerate_doc_item(struct ast_xml_doc_item *item)
{
    const char *name;
    char *syntax;
    char *seealso;
    char *arguments;
    char *synopsis;
    char *description;
 
    if (!item || !item->node) {
        return -1;
    }
 
    name = ast_xml_get_attribute(item->node, "name");
    if (!name) {
        return -1;
    }
 
    syntax = _ast_xmldoc_build_syntax(item->node, item->type, name);
    seealso = _ast_xmldoc_build_seealso(item->node);
    arguments = _ast_xmldoc_build_arguments(item->node);
    synopsis = _ast_xmldoc_build_synopsis(item->node);
    description = _ast_xmldoc_build_description(item->node);
 
    if (syntax) {
        ast_str_set(&item->syntax, 0, "%s", syntax);
    }
    if (seealso) {
        ast_str_set(&item->seealso, 0, "%s", seealso);
    }
    if (arguments) {
        ast_str_set(&item->arguments, 0, "%s", arguments);
    }
    if (synopsis) {
        ast_str_set(&item->synopsis, 0, "%s", synopsis);
    }
    if (description) {
        ast_str_set(&item->description, 0, "%s", description);
    }
 
    ast_free(syntax);
    ast_free(seealso);
    ast_free(arguments);
    ast_free(synopsis);
    ast_free(description);
    ast_xml_free_attr(name);
    return 0;
}
 
struct ao2_container *ast_xmldoc_build_documentation(const char *type)
{
    struct ao2_container *docs;
    struct ast_xml_node *node = NULL, *instance = NULL;
    struct documentation_tree *doctree;
    const char *name;
 
    docs = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_MUTEX, 0, 127,
        ast_xml_doc_item_hash, NULL, ast_xml_doc_item_cmp);
    if (!docs) {
        ast_log(AST_LOG_ERROR, "Failed to create container for xml document item instances\n");
        return NULL;
    }
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    AST_LIST_TRAVERSE(&xmldoc_tree, doctree, entry) {
        /* the core xml documents have priority over thirdparty document. */
        node = ast_xml_get_root(doctree->doc);
        if (!node) {
            break;
        }
 
        for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
            struct ast_xml_doc_item *item = NULL;
 
            /* Ignore empty nodes or nodes that aren't of the type requested */
            if (!ast_xml_node_get_children(node) || strcasecmp(ast_xml_node_get_name(node), type)) {
                continue;
            }
            name = ast_xml_get_attribute(node, "name");
            if (!name) {
                continue;
            }
 
            switch (xmldoc_get_syntax_type(type)) {
            case MANAGER_EVENT_SYNTAX:
            {
                struct ast_xml_doc_item_list root;
 
                AST_LIST_HEAD_INIT(&root);
                for (instance = ast_xml_node_get_children(node); instance; instance = ast_xml_node_get_next(instance)) {
                    struct ast_xml_doc_item *temp;
                    if (!ast_xml_node_get_children(instance) || strcasecmp(ast_xml_node_get_name(instance), "managerEventInstance")) {
                        continue;
                    }
                    temp = xmldoc_build_documentation_item(instance, name, type);
                    if (!temp) {
                        break;
                    }
                    AST_LIST_INSERT_TAIL(&root, temp, next);
                }
                item = AST_LIST_FIRST(&root);
                break;
            }
            case CONFIG_INFO_SYNTAX:
            {
                RAII_VAR(const char *, name, ast_xml_get_attribute(node, "name"), ast_xml_free_attr);
 
                if (!ast_xml_node_get_children(node) || strcasecmp(ast_xml_node_get_name(node), "configInfo")) {
                    break;
                }
 
                item = xmldoc_build_documentation_item(node, name, "configInfo");
                if (item) {
                    struct ast_xml_doc_item_list root;
 
                    AST_LIST_HEAD_INIT(&root);
                    AST_LIST_INSERT_TAIL(&root, item, next);
                    build_config_docs(node, &root);
                }
                break;
            }
            default:
                item = xmldoc_build_documentation_item(node, name, type);
            }
            ast_xml_free_attr(name);
 
            if (item) {
                ao2_link(docs, item);
                ao2_t_ref(item, -1, "Dispose of creation ref");
            }
        }
    }
    AST_RWLIST_UNLOCK(&xmldoc_tree);
 
    return docs;
}
 
int ast_xmldoc_regenerate_doc_item(struct ast_xml_doc_item *item);
 
 
#if !defined(HAVE_GLOB_NOMAGIC) || !defined(HAVE_GLOB_BRACE) || defined(DEBUG_NONGNU)
static int xml_pathmatch(char *xmlpattern, int xmlpattern_maxlen, glob_t *globbuf)
{
    int globret;
 
    snprintf(xmlpattern, xmlpattern_maxlen, "%s/documentation/thirdparty/*-%s.xml",
        ast_config_AST_DATA_DIR, documentation_language);
    if((globret = glob(xmlpattern, GLOB_NOCHECK, NULL, globbuf))) {
        return globret;
    }
 
    snprintf(xmlpattern, xmlpattern_maxlen, "%s/documentation/thirdparty/*-%.2s_??.xml",
        ast_config_AST_DATA_DIR, documentation_language);
    if((globret = glob(xmlpattern, GLOB_APPEND | GLOB_NOCHECK, NULL, globbuf))) {
        return globret;
    }
 
    snprintf(xmlpattern, xmlpattern_maxlen, "%s/documentation/thirdparty/*-%s.xml",
        ast_config_AST_DATA_DIR, default_documentation_language);
    if((globret = glob(xmlpattern, GLOB_APPEND | GLOB_NOCHECK, NULL, globbuf))) {
        return globret;
    }
 
    snprintf(xmlpattern, xmlpattern_maxlen, "%s/documentation/*-%s.xml",
        ast_config_AST_DATA_DIR, documentation_language);
    if((globret = glob(xmlpattern, GLOB_APPEND | GLOB_NOCHECK, NULL, globbuf))) {
        return globret;
    }
 
    snprintf(xmlpattern, xmlpattern_maxlen, "%s/documentation/*-%.2s_??.xml",
        ast_config_AST_DATA_DIR, documentation_language);
    if((globret = glob(xmlpattern, GLOB_APPEND | GLOB_NOCHECK, NULL, globbuf))) {
        return globret;
    }
 
    snprintf(xmlpattern, xmlpattern_maxlen, "%s/documentation/*-%s.xml",
        ast_config_AST_DATA_DIR, default_documentation_language);
    globret = glob(xmlpattern, GLOB_APPEND | GLOB_NOCHECK, NULL, globbuf);
 
    return globret;
}
#endif
 
static char *handle_dump_docs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    struct documentation_tree *doctree;
    struct ast_xml_doc *dumpdoc;
    struct ast_xml_node *dumproot;
    FILE *f;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "xmldoc dump";
        e->usage =
            "Usage: xmldoc dump <filename>\n"
            "  Dump XML documentation to a file\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc != 3) {
        return CLI_SHOWUSAGE;
    }
 
    dumpdoc = ast_xml_new();
    if (!dumpdoc) {
        ast_log(LOG_ERROR, "Could not create new XML document\n");
        return CLI_FAILURE;
    }
 
    dumproot = ast_xml_new_node("docs");
    if (!dumproot) {
        ast_xml_close(dumpdoc);
        ast_log(LOG_ERROR, "Could not create new XML root node\n");
        return CLI_FAILURE;
    }
 
    ast_xml_set_root(dumpdoc, dumproot);
 
    AST_RWLIST_RDLOCK(&xmldoc_tree);
    AST_LIST_TRAVERSE(&xmldoc_tree, doctree, entry) {
        struct ast_xml_node *root_node = ast_xml_get_root(doctree->doc);
        struct ast_xml_node *kids = ast_xml_node_get_children(root_node);
        struct ast_xml_node *kids_copy;
 
        /* If there are no kids someone screwed up, but we check anyway. */
        if (!kids) {
            continue;
        }
 
        kids_copy = ast_xml_copy_node_list(kids);
        if (!kids_copy) {
            ast_xml_close(dumpdoc);
            ast_log(LOG_ERROR, "Could not create copy of XML node list\n");
            return CLI_FAILURE;
        }
 
        ast_xml_add_child_list(dumproot, kids_copy);
    }
    AST_RWLIST_UNLOCK(&xmldoc_tree);
 
    if (!(f = fopen(a->argv[2], "w"))) {
        ast_xml_close(dumpdoc);
        ast_log(LOG_ERROR, "Could not open file '%s': %s\n", a->argv[2], strerror(errno));
        return CLI_FAILURE;
    }
 
    ast_xml_doc_dump_file(f, dumpdoc);
    ast_xml_close(dumpdoc);
 
    fclose(f);
    return CLI_SUCCESS;
}
 
static struct ast_cli_entry cli_dump_xmldocs = AST_CLI_DEFINE(handle_dump_docs, "Dump the XML docs to the specified file");
 
static char *handle_reload_docs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
static struct ast_cli_entry cli_reload_xmldocs = AST_CLI_DEFINE(handle_reload_docs, "Reload the XML docs");
 
/*! \note Must be called with xmldoc_tree locked */
static void xmldoc_purge_documentation(void)
{
    struct documentation_tree *doctree;
 
    while ((doctree = AST_RWLIST_REMOVE_HEAD(&xmldoc_tree, entry))) {
        ast_free(doctree->filename);
        ast_xml_close(doctree->doc);
        ast_free(doctree);
    }
}
 
/*! \brief Close and unload XML documentation. */
static void xmldoc_unload_documentation(void)
{
    ast_cli_unregister(&cli_reload_xmldocs);
    ast_cli_unregister(&cli_dump_xmldocs);
 
    AST_RWLIST_WRLOCK(&xmldoc_tree);
    xmldoc_purge_documentation();
    AST_RWLIST_UNLOCK(&xmldoc_tree);
 
    ast_xml_finish();
}
 
static int xmldoc_load_documentation(int first_time)
{
    struct ast_xml_node *root_node;
    struct ast_xml_doc *tmpdoc;
    struct documentation_tree *doc_tree;
    char *xmlpattern;
    struct ast_config *cfg = NULL;
    struct ast_variable *var = NULL;
    struct ast_flags cnfflags = { 0 };
    int globret, i, dup, duplicate;
    glob_t globbuf;
#if !defined(HAVE_GLOB_NOMAGIC) || !defined(HAVE_GLOB_BRACE) || defined(DEBUG_NONGNU)
    int xmlpattern_maxlen;
#endif
 
    /* setup default XML documentation language */
    snprintf(documentation_language, sizeof(documentation_language), default_documentation_language);
 
    if ((cfg = ast_config_load2("asterisk.conf", "" /* core can't reload */, cnfflags)) && cfg != CONFIG_STATUS_FILEINVALID) {
        for (var = ast_variable_browse(cfg, "options"); var; var = var->next) {
            if (!strcasecmp(var->name, "documentation_language")) {
                if (!ast_strlen_zero(var->value)) {
                    snprintf(documentation_language, sizeof(documentation_language), "%s", var->value);
                }
            }
        }
        ast_config_destroy(cfg);
    }
 
    if (first_time) {
        /* initialize the XML library. */
        ast_xml_init();
        ast_cli_register(&cli_dump_xmldocs);
        ast_cli_register(&cli_reload_xmldocs);
        /* register function to be run when asterisk finish. */
        ast_register_cleanup(xmldoc_unload_documentation);
    }
 
    globbuf.gl_offs = 0;    /* slots to reserve in gl_pathv */
 
#if !defined(HAVE_GLOB_NOMAGIC) || !defined(HAVE_GLOB_BRACE) || defined(DEBUG_NONGNU)
    xmlpattern_maxlen = strlen(ast_config_AST_DATA_DIR) + strlen("/documentation/thirdparty") + strlen("/*-??_??.xml") + 1;
    xmlpattern = ast_malloc(xmlpattern_maxlen);
    globret = xml_pathmatch(xmlpattern, xmlpattern_maxlen, &globbuf);
#else
    /* Get every *-LANG.xml file inside $(ASTDATADIR)/documentation */
    if (ast_asprintf(&xmlpattern, "%s/documentation{/thirdparty/,/}*-{%s,%.2s_??,%s}.xml", ast_config_AST_DATA_DIR,
        documentation_language, documentation_language, default_documentation_language) < 0) {
        return 1;
    }
    globret = glob(xmlpattern, MY_GLOB_FLAGS, NULL, &globbuf);
#endif
 
    ast_debug(3, "gl_pathc %zu\n", (size_t)globbuf.gl_pathc);
    if (globret == GLOB_NOSPACE) {
        ast_log(LOG_WARNING, "XML load failure, glob expansion of pattern '%s' failed: Not enough memory\n", xmlpattern);
        ast_free(xmlpattern);
        return 1;
    } else if (globret  == GLOB_ABORTED) {
        ast_log(LOG_WARNING, "XML load failure, glob expansion of pattern '%s' failed: Read error\n", xmlpattern);
        ast_free(xmlpattern);
        return 1;
    }
    ast_free(xmlpattern);
 
    AST_RWLIST_WRLOCK(&xmldoc_tree);
 
    if (!first_time) {
        /* If we're reloading, purge the existing documentation.
         * We do this with the lock held so that if somebody
         * else tries to get documentation, there's no chance
         * of retrieiving it after we purged the old docs
         * but before we loaded the new ones. */
        xmldoc_purge_documentation();
    }
 
    /* loop over expanded files */
    for (i = 0; i < globbuf.gl_pathc; i++) {
        /* check for duplicates (if we already [try to] open the same file. */
        duplicate = 0;
        for (dup = 0; dup < i; dup++) {
            if (!strcmp(globbuf.gl_pathv[i], globbuf.gl_pathv[dup])) {
                duplicate = 1;
                break;
            }
        }
        if (duplicate || strchr(globbuf.gl_pathv[i], '*')) {
        /* skip duplicates as well as pathnames not found
         * (due to use of GLOB_NOCHECK in xml_pathmatch) */
            continue;
        }
        tmpdoc = NULL;
        tmpdoc = ast_xml_open(globbuf.gl_pathv[i]);
        if (!tmpdoc) {
            ast_log(LOG_ERROR, "Could not open XML documentation at '%s'\n", globbuf.gl_pathv[i]);
            continue;
        }
        /* Get doc root node and check if it starts with '<docs>' */
        root_node = ast_xml_get_root(tmpdoc);
        if (!root_node) {
            ast_log(LOG_ERROR, "Error getting documentation root node\n");
            ast_xml_close(tmpdoc);
            continue;
        }
        /* Check root node name for malformed xmls. */
        if (strcmp(ast_xml_node_get_name(root_node), "docs")) {
            ast_log(LOG_ERROR, "Documentation file is not well formed!\n");
            ast_xml_close(tmpdoc);
            continue;
        }
        doc_tree = ast_calloc(1, sizeof(*doc_tree));
        if (!doc_tree) {
            ast_log(LOG_ERROR, "Unable to allocate documentation_tree structure!\n");
            ast_xml_close(tmpdoc);
            continue;
        }
        doc_tree->doc = tmpdoc;
        doc_tree->filename = ast_strdup(globbuf.gl_pathv[i]);
        AST_RWLIST_INSERT_TAIL(&xmldoc_tree, doc_tree, entry);
    }
    AST_RWLIST_UNLOCK(&xmldoc_tree);
 
    globfree(&globbuf);
 
    return 0;
}
 
int ast_xmldoc_load_documentation(void)
{
    return xmldoc_load_documentation(1);
}
 
static int xmldoc_reload_documentation(void)
{
    return xmldoc_load_documentation(0);
}
 
static char *handle_reload_docs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    switch (cmd) {
    case CLI_INIT:
        e->command = "xmldoc reload";
        e->usage =
            "Usage: xmldoc reload\n"
            "  Reload XML documentation\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    xmldoc_reload_documentation();
    return CLI_SUCCESS;
}
 
#endif /* AST_XML_DOCS */