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9faa7a88 RK |
1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2004-2008 Richard Kettlewell | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | /** @file server/options.c | |
21 | * @brief CGI options | |
22 | */ | |
23 | ||
24 | #include <config.h> | |
25 | #include "types.h" | |
26 | ||
27 | #include <stdio.h> | |
28 | ||
29 | #include "mem.h" | |
30 | #include "hash.h" | |
31 | #include "macros.h" | |
32 | #include "options.h" | |
33 | #include "split.h" | |
34 | #include "table.h" | |
35 | ||
36 | struct column { | |
37 | int ncolumns; | |
38 | char **columns; | |
39 | }; | |
40 | ||
41 | static hash *labels; | |
42 | static hash *columns; | |
43 | ||
44 | static void option__label(int attribute((unused)) nvec, | |
45 | char **vec) { | |
46 | option_set(vec[0], vec[1]); | |
47 | } | |
48 | ||
49 | static void option__include(int attribute((unused)) nvec, | |
50 | char **vec) { | |
51 | option__readfile(vec[0]); | |
52 | } | |
53 | ||
54 | static void option__columns(int nvec, | |
55 | char **vec) { | |
56 | struct column c; | |
57 | ||
58 | c.ncolumns = nvec - 1; | |
59 | c.columns = &vec[1]; | |
60 | hash_add(columns, vec[0], &c, HASH_INSERT_OR_REPLACE); | |
61 | } | |
62 | ||
63 | static struct option { | |
64 | const char *name; | |
65 | int minargs, maxargs; | |
66 | void (*handler)(int nvec, char **vec); | |
67 | } options[] = { | |
68 | { "columns", 1, INT_MAX, option_columns }, | |
69 | { "include", 1, 1, option_include }, | |
70 | { "label", 2, 2, option_label }, | |
71 | }; | |
72 | ||
73 | static void option__split_error(const char *msg, | |
74 | void *u) { | |
75 | struct read_options_state *cs = u; | |
76 | ||
77 | error(0, "%s:%d: %s", cs->name, cs->line, msg); | |
78 | } | |
79 | ||
80 | static void option__readfile(const char *name) { | |
81 | int n, i; | |
82 | int fd; | |
83 | FILE *fp; | |
84 | char **vec, *buffer; | |
85 | struct read_options_state cs; | |
86 | const char *path; | |
87 | ||
88 | if(!(cs.name = mx_find(name))) | |
89 | return; | |
90 | if(!(fp = fopen(cs.name, "r"))) | |
91 | fatal(errno, "error opening %s", cs.name); | |
92 | cs.line = 0; | |
93 | while(!inputline(cs.name, fp, &buffer, '\n')) { | |
94 | ++cs.line; | |
95 | if(!(vec = split(buffer, &n, SPLIT_COMMENTS|SPLIT_QUOTES, | |
96 | option__split_error, &cs))) | |
97 | continue; | |
98 | if(!n) | |
99 | continue; | |
100 | if((i = TABLE_FIND(options, struct option, name, vec[0])) == -1) { | |
101 | error(0, "%s:%d: unknown option '%s'", cs.name, cs.line, vec[0]); | |
102 | continue; | |
103 | } | |
104 | ++vec; | |
105 | --n; | |
106 | if(n < options[i].minargs) { | |
107 | error(0, "%s:%d: too few arguments to '%s'", cs.name, cs.line, vec[-1]); | |
108 | continue; | |
109 | } | |
110 | if(n > options[i].maxargs) { | |
111 | error(0, "%s:%d: too many arguments to '%s'", cs.name, cs.line, vec[-1]); | |
112 | continue; | |
113 | } | |
114 | options[i].handler(n, vec); | |
115 | } | |
116 | fclose(fp); | |
117 | } | |
118 | ||
119 | static void option__init(void) { | |
120 | static int have_read_options; | |
121 | ||
122 | if(!have_read_options) { | |
123 | have_read_options = 1; | |
124 | labels = hash_new(sizeof (char *)); | |
125 | columns = hash_new(sizeof (struct column)); | |
126 | option__readfile("options"); | |
127 | } | |
128 | } | |
129 | ||
130 | /** @brief Set an option | |
131 | * @param name Option name | |
132 | * @param value Option value | |
133 | * | |
134 | * If the option was already set its value is replaced. | |
135 | * | |
136 | * @p name and @p value are copied. | |
137 | */ | |
138 | void option_set(const char *name, const char *value) { | |
139 | char *v = xstrdup(value); | |
140 | ||
141 | option__init(); | |
142 | hash_add(labels, name, &v, HASH_INSERT_OR_REPLACE); | |
143 | } | |
144 | ||
145 | /** @brief Get a label | |
146 | * @param key Name of label | |
147 | * @return Value of label (never NULL) | |
148 | * | |
149 | * If label images.X isn't found then the return value is | |
150 | * <url.static>X.png, allowing url.static to be used to provide a base | |
151 | * for all images with per-image overrides. | |
152 | * | |
153 | * Otherwise undefined labels expand to their last (dot-separated) | |
154 | * component. | |
155 | */ | |
156 | const char *option_label(const char *key) { | |
157 | const char *label; | |
158 | ||
159 | option__init(); | |
160 | if(!(label = *(char **)hash_find(labels, key))) { | |
161 | /* No label found */ | |
162 | if(!strncmp(key, "images.", 7)) { | |
163 | static const char *url_static; | |
164 | /* images.X defaults to <url.static>X.png */ | |
165 | ||
166 | if(!url_static) | |
167 | url_static = option_label("url.static"); | |
168 | byte_xasprintf((char **)&label, "%s%s.png", url_static, key + 7); | |
169 | } else if((label = strrchr(key, '.'))) | |
170 | /* X.Y defaults to Y */ | |
171 | ++label; | |
172 | else | |
173 | /* otherwise default to label name */ | |
174 | label = key; | |
175 | } | |
176 | return label; | |
177 | } | |
178 | ||
179 | /** @brief Test whether a label exists | |
180 | * @param key Name of label | |
181 | * @return 1 if label exists, otherwise 0 | |
182 | * | |
183 | * Labels that don't exist still have an expansion (per option_label() | |
184 | * documentation), and possibly not even a placeholder one. | |
185 | */ | |
186 | int option_label_exists(const char *key) { | |
187 | option__init(); | |
188 | return !!hash_find(labels, key); | |
189 | } | |
190 | ||
191 | /** @brief Return a column list | |
192 | * @param name Context (playing/recent/etc) | |
193 | * @param ncolumns Where to store column count or NULL | |
194 | * @return Pointer to column list | |
195 | */ | |
196 | char **option_columns(const char *name, int *ncolumns) { | |
197 | struct column *c; | |
198 | ||
199 | option__init(); | |
200 | c = hash_find(columns, name); | |
201 | if(c) { | |
202 | if(ncolumns) | |
203 | *ncolumns = c->ncolumns; | |
204 | return c->columns; | |
205 | } else { | |
206 | if(ncolumns) | |
207 | *ncolumns = 0; | |
208 | return 0; | |
209 | } | |
210 | } | |
211 | ||
212 | /* | |
213 | Local Variables: | |
214 | c-basic-offset:2 | |
215 | comment-column:40 | |
216 | End: | |
217 | */ |