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1 | /* Helper routines for parsing XML using Expat. |
2 | ||
3 | Copyright (C) 2006 | |
4 | Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
21 | Boston, MA 02110-1301, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | ||
25 | /* The contents of this file are only useful if XML support is | |
26 | available. */ | |
27 | #ifdef HAVE_LIBEXPAT | |
28 | ||
29 | #include "exceptions.h" | |
30 | #include "xml-support.h" | |
31 | ||
32 | #include <expat.h> | |
33 | ||
34 | #include "gdb_string.h" | |
35 | ||
36 | /* Returns the value of attribute ATTR from expat attribute list | |
37 | ATTRLIST. If not found, throws an exception. */ | |
38 | ||
39 | const XML_Char * | |
40 | xml_get_required_attribute (const XML_Char **attrs, | |
41 | const XML_Char *attr) | |
42 | { | |
43 | const XML_Char **p; | |
44 | for (p = attrs; *p; p += 2) | |
45 | { | |
46 | const char *name = p[0]; | |
47 | const char *val = p[1]; | |
48 | ||
49 | if (strcmp (name, attr) == 0) | |
50 | return val; | |
51 | } | |
52 | throw_error (XML_PARSE_ERROR, _("Can't find attribute %s"), attr); | |
53 | } | |
54 | ||
55 | /* Parse a field VALSTR that we expect to contain an integer value. | |
56 | The integer is returned in *VALP. The string is parsed with an | |
57 | equivalent to strtoul. | |
58 | ||
59 | Returns 0 for success, -1 for error. */ | |
60 | ||
61 | static int | |
62 | xml_parse_unsigned_integer (const char *valstr, ULONGEST *valp) | |
63 | { | |
64 | const char *endptr; | |
65 | ULONGEST result; | |
66 | ||
67 | if (*valstr == '\0') | |
68 | return -1; | |
69 | ||
70 | result = strtoulst (valstr, &endptr, 0); | |
71 | if (*endptr != '\0') | |
72 | return -1; | |
73 | ||
74 | *valp = result; | |
75 | return 0; | |
76 | } | |
77 | ||
78 | /* Gets the value of an integer attribute named ATTR, if it's present. | |
79 | If the attribute is not found, or can't be parsed as integer, | |
80 | throws an exception. */ | |
81 | ||
82 | ULONGEST | |
83 | xml_get_integer_attribute (const XML_Char **attrs, | |
84 | const XML_Char *attr) | |
85 | { | |
86 | ULONGEST result; | |
87 | const XML_Char *value = xml_get_required_attribute (attrs, attr); | |
88 | ||
89 | if (xml_parse_unsigned_integer (value, &result) != 0) | |
90 | { | |
91 | throw_error (XML_PARSE_ERROR, | |
92 | _("Can't convert value of attribute %s, %s, to integer"), | |
93 | attr, value); | |
94 | } | |
95 | return result; | |
96 | } | |
97 | ||
98 | /* Obtains a value of attribute with enumerated type. In XML, enumerated | |
99 | attributes have string as a value, and in C, they are represented as | |
100 | values of enumerated type. This function maps the attribute onto | |
101 | an integer value that can be immediately converted into enumerated | |
102 | type. | |
103 | ||
104 | First, obtains the string value of ATTR in ATTRS. | |
105 | Then, finds the index of that value in XML_NAMES, which is a zero-terminated | |
106 | array of strings. If found, returns the element of VALUES with that index. | |
107 | Otherwise throws. */ | |
108 | ||
109 | int | |
110 | xml_get_enum_value (const XML_Char **attrs, | |
111 | const XML_Char *attr, | |
112 | const XML_Char **xml_names, | |
113 | int *values) | |
114 | { | |
115 | const XML_Char *value = xml_get_required_attribute (attrs, attr); | |
116 | ||
117 | int i; | |
118 | for (i = 0; xml_names[i]; ++i) | |
119 | { | |
120 | if (strcmp (xml_names[i], value) == 0) | |
121 | return values[i]; | |
122 | } | |
123 | throw_error (XML_PARSE_ERROR, | |
124 | _("Invalid enumerated value in XML: %s"), value); | |
125 | } | |
126 | ||
127 | /* Cleanup wrapper for XML_ParserFree, with the correct type | |
128 | for make_cleanup. */ | |
129 | ||
130 | static void | |
131 | free_xml_parser (void *parser) | |
132 | { | |
133 | XML_ParserFree (parser); | |
134 | } | |
135 | ||
136 | /* Register a cleanup to release PARSER. Only the parser itself | |
137 | is freed; another cleanup may be necessary to discard any | |
138 | associated user data. */ | |
139 | ||
140 | void | |
141 | make_cleanup_free_xml_parser (XML_Parser parser) | |
142 | { | |
143 | make_cleanup (free_xml_parser, parser); | |
144 | } | |
145 | ||
146 | #endif /* HAVE_LIBEXPAT */ |