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fd79ecee DJ |
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 | ||
f2d483c4 DJ |
36 | #ifndef XML_STATUS_OK |
37 | # define XML_STATUS_OK 1 | |
38 | # define XML_STATUS_ERROR 0 | |
39 | #endif | |
40 | ||
fd79ecee DJ |
41 | /* Returns the value of attribute ATTR from expat attribute list |
42 | ATTRLIST. If not found, throws an exception. */ | |
43 | ||
44 | const XML_Char * | |
45 | xml_get_required_attribute (const XML_Char **attrs, | |
46 | const XML_Char *attr) | |
47 | { | |
48 | const XML_Char **p; | |
49 | for (p = attrs; *p; p += 2) | |
50 | { | |
51 | const char *name = p[0]; | |
52 | const char *val = p[1]; | |
53 | ||
54 | if (strcmp (name, attr) == 0) | |
55 | return val; | |
56 | } | |
57 | throw_error (XML_PARSE_ERROR, _("Can't find attribute %s"), attr); | |
58 | } | |
59 | ||
60 | /* Parse a field VALSTR that we expect to contain an integer value. | |
61 | The integer is returned in *VALP. The string is parsed with an | |
62 | equivalent to strtoul. | |
63 | ||
64 | Returns 0 for success, -1 for error. */ | |
65 | ||
66 | static int | |
67 | xml_parse_unsigned_integer (const char *valstr, ULONGEST *valp) | |
68 | { | |
69 | const char *endptr; | |
70 | ULONGEST result; | |
71 | ||
72 | if (*valstr == '\0') | |
73 | return -1; | |
74 | ||
75 | result = strtoulst (valstr, &endptr, 0); | |
76 | if (*endptr != '\0') | |
77 | return -1; | |
78 | ||
79 | *valp = result; | |
80 | return 0; | |
81 | } | |
82 | ||
83 | /* Gets the value of an integer attribute named ATTR, if it's present. | |
84 | If the attribute is not found, or can't be parsed as integer, | |
85 | throws an exception. */ | |
86 | ||
87 | ULONGEST | |
88 | xml_get_integer_attribute (const XML_Char **attrs, | |
89 | const XML_Char *attr) | |
90 | { | |
91 | ULONGEST result; | |
92 | const XML_Char *value = xml_get_required_attribute (attrs, attr); | |
93 | ||
94 | if (xml_parse_unsigned_integer (value, &result) != 0) | |
95 | { | |
96 | throw_error (XML_PARSE_ERROR, | |
97 | _("Can't convert value of attribute %s, %s, to integer"), | |
98 | attr, value); | |
99 | } | |
100 | return result; | |
101 | } | |
102 | ||
103 | /* Obtains a value of attribute with enumerated type. In XML, enumerated | |
104 | attributes have string as a value, and in C, they are represented as | |
105 | values of enumerated type. This function maps the attribute onto | |
106 | an integer value that can be immediately converted into enumerated | |
107 | type. | |
108 | ||
109 | First, obtains the string value of ATTR in ATTRS. | |
110 | Then, finds the index of that value in XML_NAMES, which is a zero-terminated | |
111 | array of strings. If found, returns the element of VALUES with that index. | |
112 | Otherwise throws. */ | |
113 | ||
114 | int | |
115 | xml_get_enum_value (const XML_Char **attrs, | |
116 | const XML_Char *attr, | |
117 | const XML_Char **xml_names, | |
118 | int *values) | |
119 | { | |
120 | const XML_Char *value = xml_get_required_attribute (attrs, attr); | |
121 | ||
122 | int i; | |
123 | for (i = 0; xml_names[i]; ++i) | |
124 | { | |
125 | if (strcmp (xml_names[i], value) == 0) | |
126 | return values[i]; | |
127 | } | |
128 | throw_error (XML_PARSE_ERROR, | |
129 | _("Invalid enumerated value in XML: %s"), value); | |
130 | } | |
131 | ||
132 | /* Cleanup wrapper for XML_ParserFree, with the correct type | |
133 | for make_cleanup. */ | |
134 | ||
135 | static void | |
136 | free_xml_parser (void *parser) | |
137 | { | |
138 | XML_ParserFree (parser); | |
139 | } | |
140 | ||
141 | /* Register a cleanup to release PARSER. Only the parser itself | |
142 | is freed; another cleanup may be necessary to discard any | |
143 | associated user data. */ | |
144 | ||
145 | void | |
146 | make_cleanup_free_xml_parser (XML_Parser parser) | |
147 | { | |
148 | make_cleanup (free_xml_parser, parser); | |
149 | } | |
150 | ||
151 | #endif /* HAVE_LIBEXPAT */ |