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/* Helper routines for parsing XML using Expat.
Copyright (C) 2006
Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "defs.h"
/* The contents of this file are only useful if XML support is
available. */
#ifdef HAVE_LIBEXPAT
#include "exceptions.h"
#include "xml-support.h"
#include <expat.h>
#include "gdb_string.h"
#ifndef XML_STATUS_OK
# define XML_STATUS_OK 1
# define XML_STATUS_ERROR 0
#endif
/* Returns the value of attribute ATTR from expat attribute list
ATTRLIST. If not found, throws an exception. */
const XML_Char *
xml_get_required_attribute (const XML_Char **attrs,
const XML_Char *attr)
{
const XML_Char **p;
for (p = attrs; *p; p += 2)
{
const char *name = p[0];
const char *val = p[1];
if (strcmp (name, attr) == 0)
return val;
}
throw_error (XML_PARSE_ERROR, _("Can't find attribute %s"), attr);
}
/* Parse a field VALSTR that we expect to contain an integer value.
The integer is returned in *VALP. The string is parsed with an
equivalent to strtoul.
Returns 0 for success, -1 for error. */
static int
xml_parse_unsigned_integer (const char *valstr, ULONGEST *valp)
{
const char *endptr;
ULONGEST result;
if (*valstr == '\0')
return -1;
result = strtoulst (valstr, &endptr, 0);
if (*endptr != '\0')
return -1;
*valp = result;
return 0;
}
/* Gets the value of an integer attribute named ATTR, if it's present.
If the attribute is not found, or can't be parsed as integer,
throws an exception. */
ULONGEST
xml_get_integer_attribute (const XML_Char **attrs,
const XML_Char *attr)
{
ULONGEST result;
const XML_Char *value = xml_get_required_attribute (attrs, attr);
if (xml_parse_unsigned_integer (value, &result) != 0)
{
throw_error (XML_PARSE_ERROR,
_("Can't convert value of attribute %s, %s, to integer"),
attr, value);
}
return result;
}
/* Obtains a value of attribute with enumerated type. In XML, enumerated
attributes have string as a value, and in C, they are represented as
values of enumerated type. This function maps the attribute onto
an integer value that can be immediately converted into enumerated
type.
First, obtains the string value of ATTR in ATTRS.
Then, finds the index of that value in XML_NAMES, which is a zero-terminated
array of strings. If found, returns the element of VALUES with that index.
Otherwise throws. */
int
xml_get_enum_value (const XML_Char **attrs,
const XML_Char *attr,
const XML_Char **xml_names,
int *values)
{
const XML_Char *value = xml_get_required_attribute (attrs, attr);
int i;
for (i = 0; xml_names[i]; ++i)
{
if (strcmp (xml_names[i], value) == 0)
return values[i];
}
throw_error (XML_PARSE_ERROR,
_("Invalid enumerated value in XML: %s"), value);
}
/* Cleanup wrapper for XML_ParserFree, with the correct type
for make_cleanup. */
static void
free_xml_parser (void *parser)
{
XML_ParserFree (parser);
}
/* Register a cleanup to release PARSER. Only the parser itself
is freed; another cleanup may be necessary to discard any
associated user data. */
void
make_cleanup_free_xml_parser (XML_Parser parser)
{
make_cleanup (free_xml_parser, parser);
}
#endif /* HAVE_LIBEXPAT */
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