| 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 | * Options represent an additional configuration system private to the |
| 24 | * CGI program. |
| 25 | */ |
| 26 | |
| 27 | #include "disorder-cgi.h" |
| 28 | |
| 29 | struct column { |
| 30 | int ncolumns; |
| 31 | char **columns; |
| 32 | }; |
| 33 | |
| 34 | struct read_options_state { |
| 35 | const char *name; |
| 36 | int line; |
| 37 | }; |
| 38 | |
| 39 | static hash *labels; |
| 40 | static hash *columns; |
| 41 | |
| 42 | static void option__readfile(const char *name); |
| 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 | FILE *fp; |
| 83 | char **vec, *buffer; |
| 84 | struct read_options_state cs; |
| 85 | |
| 86 | if(!(cs.name = mx_find(name, 1/*report*/))) |
| 87 | return; |
| 88 | if(!(fp = fopen(cs.name, "r"))) |
| 89 | fatal(errno, "error opening %s", cs.name); |
| 90 | cs.line = 0; |
| 91 | while(!inputline(cs.name, fp, &buffer, '\n')) { |
| 92 | ++cs.line; |
| 93 | if(!(vec = split(buffer, &n, SPLIT_COMMENTS|SPLIT_QUOTES, |
| 94 | option__split_error, &cs))) |
| 95 | continue; |
| 96 | if(!n) |
| 97 | continue; |
| 98 | if((i = TABLE_FIND(options, name, vec[0])) == -1) { |
| 99 | error(0, "%s:%d: unknown option '%s'", cs.name, cs.line, vec[0]); |
| 100 | continue; |
| 101 | } |
| 102 | ++vec; |
| 103 | --n; |
| 104 | if(n < options[i].minargs) { |
| 105 | error(0, "%s:%d: too few arguments to '%s'", cs.name, cs.line, vec[-1]); |
| 106 | continue; |
| 107 | } |
| 108 | if(n > options[i].maxargs) { |
| 109 | error(0, "%s:%d: too many arguments to '%s'", cs.name, cs.line, vec[-1]); |
| 110 | continue; |
| 111 | } |
| 112 | options[i].handler(n, vec); |
| 113 | } |
| 114 | fclose(fp); |
| 115 | } |
| 116 | |
| 117 | static void option__init(void) { |
| 118 | static int have_read_options; |
| 119 | |
| 120 | if(!have_read_options) { |
| 121 | have_read_options = 1; |
| 122 | labels = hash_new(sizeof (char *)); |
| 123 | columns = hash_new(sizeof (struct column)); |
| 124 | option__readfile("options"); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /** @brief Set an option |
| 129 | * @param name Option name |
| 130 | * @param value Option value |
| 131 | * |
| 132 | * If the option was already set its value is replaced. |
| 133 | * |
| 134 | * @p name and @p value are copied. |
| 135 | */ |
| 136 | void option_set(const char *name, const char *value) { |
| 137 | char *v = xstrdup(value); |
| 138 | |
| 139 | option__init(); |
| 140 | hash_add(labels, name, &v, HASH_INSERT_OR_REPLACE); |
| 141 | } |
| 142 | |
| 143 | /** @brief Get a label |
| 144 | * @param key Name of label |
| 145 | * @return Value of label (never NULL) |
| 146 | * |
| 147 | * If label images.X isn't found then the return value is |
| 148 | * <url.static>X.png, allowing url.static to be used to provide a base |
| 149 | * for all images with per-image overrides. |
| 150 | * |
| 151 | * Otherwise undefined labels expand to their last (dot-separated) |
| 152 | * component. |
| 153 | */ |
| 154 | const char *option_label(const char *key) { |
| 155 | const char *label; |
| 156 | char **lptr; |
| 157 | |
| 158 | option__init(); |
| 159 | lptr = hash_find(labels, key); |
| 160 | if(lptr) |
| 161 | return *lptr; |
| 162 | /* No label found */ |
| 163 | if(!strncmp(key, "images.", 7)) { |
| 164 | static const char *url_static; |
| 165 | /* images.X defaults to <url.static>X.png */ |
| 166 | |
| 167 | if(!url_static) |
| 168 | url_static = option_label("url.static"); |
| 169 | byte_xasprintf((char **)&label, "%s%s.png", url_static, key + 7); |
| 170 | } else if((label = strrchr(key, '.'))) |
| 171 | /* X.Y defaults to Y */ |
| 172 | ++label; |
| 173 | else |
| 174 | /* otherwise default to label name */ |
| 175 | label = key; |
| 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 | */ |