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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 | ||
dbc981de | 32 | #include "gdb_expat.h" |
fd79ecee DJ |
33 | #include "gdb_string.h" |
34 | ||
35 | /* Returns the value of attribute ATTR from expat attribute list | |
36 | ATTRLIST. If not found, throws an exception. */ | |
37 | ||
38 | const XML_Char * | |
39 | xml_get_required_attribute (const XML_Char **attrs, | |
40 | const XML_Char *attr) | |
41 | { | |
42 | const XML_Char **p; | |
43 | for (p = attrs; *p; p += 2) | |
44 | { | |
45 | const char *name = p[0]; | |
46 | const char *val = p[1]; | |
47 | ||
48 | if (strcmp (name, attr) == 0) | |
49 | return val; | |
50 | } | |
51 | throw_error (XML_PARSE_ERROR, _("Can't find attribute %s"), attr); | |
52 | } | |
53 | ||
54 | /* Parse a field VALSTR that we expect to contain an integer value. | |
55 | The integer is returned in *VALP. The string is parsed with an | |
56 | equivalent to strtoul. | |
57 | ||
58 | Returns 0 for success, -1 for error. */ | |
59 | ||
60 | static int | |
61 | xml_parse_unsigned_integer (const char *valstr, ULONGEST *valp) | |
62 | { | |
63 | const char *endptr; | |
64 | ULONGEST result; | |
65 | ||
66 | if (*valstr == '\0') | |
67 | return -1; | |
68 | ||
69 | result = strtoulst (valstr, &endptr, 0); | |
70 | if (*endptr != '\0') | |
71 | return -1; | |
72 | ||
73 | *valp = result; | |
74 | return 0; | |
75 | } | |
76 | ||
77 | /* Gets the value of an integer attribute named ATTR, if it's present. | |
78 | If the attribute is not found, or can't be parsed as integer, | |
79 | throws an exception. */ | |
80 | ||
81 | ULONGEST | |
82 | xml_get_integer_attribute (const XML_Char **attrs, | |
83 | const XML_Char *attr) | |
84 | { | |
85 | ULONGEST result; | |
86 | const XML_Char *value = xml_get_required_attribute (attrs, attr); | |
87 | ||
88 | if (xml_parse_unsigned_integer (value, &result) != 0) | |
89 | { | |
90 | throw_error (XML_PARSE_ERROR, | |
91 | _("Can't convert value of attribute %s, %s, to integer"), | |
92 | attr, value); | |
93 | } | |
94 | return result; | |
95 | } | |
96 | ||
97 | /* Obtains a value of attribute with enumerated type. In XML, enumerated | |
98 | attributes have string as a value, and in C, they are represented as | |
99 | values of enumerated type. This function maps the attribute onto | |
100 | an integer value that can be immediately converted into enumerated | |
101 | type. | |
102 | ||
103 | First, obtains the string value of ATTR in ATTRS. | |
104 | Then, finds the index of that value in XML_NAMES, which is a zero-terminated | |
105 | array of strings. If found, returns the element of VALUES with that index. | |
106 | Otherwise throws. */ | |
107 | ||
108 | int | |
109 | xml_get_enum_value (const XML_Char **attrs, | |
110 | const XML_Char *attr, | |
111 | const XML_Char **xml_names, | |
112 | int *values) | |
113 | { | |
114 | const XML_Char *value = xml_get_required_attribute (attrs, attr); | |
115 | ||
116 | int i; | |
117 | for (i = 0; xml_names[i]; ++i) | |
118 | { | |
119 | if (strcmp (xml_names[i], value) == 0) | |
120 | return values[i]; | |
121 | } | |
122 | throw_error (XML_PARSE_ERROR, | |
123 | _("Invalid enumerated value in XML: %s"), value); | |
124 | } | |
125 | ||
126 | /* Cleanup wrapper for XML_ParserFree, with the correct type | |
127 | for make_cleanup. */ | |
128 | ||
129 | static void | |
130 | free_xml_parser (void *parser) | |
131 | { | |
132 | XML_ParserFree (parser); | |
133 | } | |
134 | ||
135 | /* Register a cleanup to release PARSER. Only the parser itself | |
136 | is freed; another cleanup may be necessary to discard any | |
137 | associated user data. */ | |
138 | ||
139 | void | |
140 | make_cleanup_free_xml_parser (XML_Parser parser) | |
141 | { | |
142 | make_cleanup (free_xml_parser, parser); | |
143 | } | |
144 | ||
145 | #endif /* HAVE_LIBEXPAT */ |