Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
5aff007d | 3 | * Copyright (C) 2004-2008 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
132a5a4a RK |
18 | /** @file lib/queue.c |
19 | * @brief Track queues | |
20 | */ | |
05b75f8d | 21 | #include "common.h" |
460b9539 | 22 | |
460b9539 | 23 | #include <errno.h> |
460b9539 | 24 | #include <stddef.h> |
460b9539 | 25 | |
26 | #include "mem.h" | |
27 | #include "queue.h" | |
28 | #include "log.h" | |
460b9539 | 29 | #include "split.h" |
30 | #include "syscalls.h" | |
460b9539 | 31 | #include "table.h" |
460b9539 | 32 | #include "printf.h" |
460b9539 | 33 | |
2dc2f478 | 34 | const char *const playing_states[] = { |
460b9539 | 35 | "failed", |
36 | "isscratch", | |
37 | "no_player", | |
38 | "ok", | |
39 | "paused", | |
40 | "quitting", | |
41 | "random", | |
42 | "scratched", | |
43 | "started", | |
44 | "unplayed" | |
45 | }; | |
46 | ||
2dc2f478 RK |
47 | /** @brief String values for @c origin field */ |
48 | const char *const track_origins[] = { | |
49 | "adopted", | |
50 | "picked", | |
51 | "random", | |
52 | "scheduled", | |
53 | "scratch", | |
54 | }; | |
55 | ||
460b9539 | 56 | #define VALUE(q, offset, type) *(type *)((char *)q + offset) |
57 | ||
05b75f8d RK |
58 | /* add new entry @n@ to a doubly linked list just after @b@ */ |
59 | void queue_insert_entry(struct queue_entry *b, struct queue_entry *n) { | |
60 | n->prev = b; | |
61 | n->next = b->next; | |
62 | n->next->prev = n; | |
63 | n->prev->next = n; | |
64 | } | |
65 | ||
66 | /* remove an entry from a doubly-linked list */ | |
67 | void queue_delete_entry(struct queue_entry *node) { | |
68 | node->next->prev = node->prev; | |
69 | node->prev->next = node->next; | |
70 | } | |
71 | ||
460b9539 | 72 | static int unmarshall_long(char *data, struct queue_entry *q, |
73 | size_t offset, | |
74 | void (*error_handler)(const char *, void *), | |
75 | void *u) { | |
76 | if(xstrtol(&VALUE(q, offset, long), data, 0, 0)) { | |
77 | error_handler(strerror(errno), u); | |
78 | return -1; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static const char *marshall_long(const struct queue_entry *q, size_t offset) { | |
84 | char buffer[256]; | |
85 | int n; | |
86 | ||
87 | n = byte_snprintf(buffer, sizeof buffer, "%ld", VALUE(q, offset, long)); | |
88 | if(n < 0) | |
89 | fatal(errno, "error converting int"); | |
90 | else if((size_t)n >= sizeof buffer) | |
91 | fatal(0, "long converted to decimal is too long"); | |
92 | return xstrdup(buffer); | |
93 | } | |
94 | ||
95 | static int unmarshall_string(char *data, struct queue_entry *q, | |
96 | size_t offset, | |
97 | void attribute((unused)) (*error_handler)(const char *, void *), | |
98 | void attribute((unused)) *u) { | |
99 | VALUE(q, offset, char *) = data; | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static const char *marshall_string(const struct queue_entry *q, size_t offset) { | |
104 | return VALUE(q, offset, char *); | |
105 | } | |
106 | ||
107 | static int unmarshall_time_t(char *data, struct queue_entry *q, | |
108 | size_t offset, | |
109 | void (*error_handler)(const char *, void *), | |
110 | void *u) { | |
111 | long_long ul; | |
112 | ||
113 | if(xstrtoll(&ul, data, 0, 0)) { | |
114 | error_handler(strerror(errno), u); | |
115 | return -1; | |
116 | } | |
117 | VALUE(q, offset, time_t) = ul; | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static const char *marshall_time_t(const struct queue_entry *q, size_t offset) { | |
122 | char buffer[256]; | |
123 | int n; | |
124 | ||
125 | n = byte_snprintf(buffer, sizeof buffer, | |
126 | "%"PRIdMAX, (intmax_t)VALUE(q, offset, time_t)); | |
127 | if(n < 0) | |
128 | fatal(errno, "error converting time"); | |
129 | else if((size_t)n >= sizeof buffer) | |
130 | fatal(0, "time converted to decimal is too long"); | |
131 | return xstrdup(buffer); | |
132 | } | |
133 | ||
134 | static int unmarshall_state(char *data, struct queue_entry *q, | |
135 | size_t offset, | |
136 | void (*error_handler)(const char *, void *), | |
137 | void *u) { | |
138 | int n; | |
139 | ||
140 | if((n = table_find(playing_states, 0, sizeof (char *), | |
141 | sizeof playing_states / sizeof *playing_states, | |
142 | data)) < 0) { | |
143 | D(("state=[%s] n=%d", data, n)); | |
144 | error_handler("invalid state", u); | |
145 | return -1; | |
146 | } | |
147 | VALUE(q, offset, enum playing_state) = n; | |
148 | return 0; | |
149 | } | |
150 | ||
2dc2f478 RK |
151 | static int unmarshall_origin(char *data, struct queue_entry *q, |
152 | size_t offset, | |
153 | void (*error_handler)(const char *, void *), | |
154 | void *u) { | |
155 | int n; | |
156 | ||
157 | if((n = table_find(track_origins, 0, sizeof (char *), | |
158 | sizeof track_origins / sizeof *track_origins, | |
159 | data)) < 0) { | |
160 | D(("origin=[%s] n=%d", data, n)); | |
161 | error_handler("invalid origin", u); | |
162 | return -1; | |
163 | } | |
164 | VALUE(q, offset, enum track_origin) = n; | |
165 | return 0; | |
166 | } | |
167 | ||
460b9539 | 168 | static const char *marshall_state(const struct queue_entry *q, size_t offset) { |
169 | return playing_states[VALUE(q, offset, enum playing_state)]; | |
170 | } | |
171 | ||
2dc2f478 RK |
172 | static const char *marshall_origin(const struct queue_entry *q, size_t offset) { |
173 | return track_origins[VALUE(q, offset, enum track_origin)]; | |
174 | } | |
175 | ||
460b9539 | 176 | #define F(n, h) { #n, offsetof(struct queue_entry, n), marshall_##h, unmarshall_##h } |
177 | ||
178 | static const struct field { | |
179 | const char *name; | |
180 | size_t offset; | |
181 | const char *(*marshall)(const struct queue_entry *q, size_t offset); | |
182 | int (*unmarshall)(char *data, struct queue_entry *q, size_t offset, | |
183 | void (*error_handler)(const char *, void *), | |
184 | void *u); | |
185 | } fields[] = { | |
186 | /* Keep this table sorted. */ | |
187 | F(expected, time_t), | |
188 | F(id, string), | |
2dc2f478 | 189 | F(origin, origin), |
460b9539 | 190 | F(played, time_t), |
191 | F(scratched, string), | |
192 | F(sofar, long), | |
193 | F(state, state), | |
194 | F(submitter, string), | |
195 | F(track, string), | |
196 | F(when, time_t), | |
197 | F(wstat, long) | |
198 | }; | |
199 | ||
200 | int queue_unmarshall(struct queue_entry *q, const char *s, | |
201 | void (*error_handler)(const char *, void *), | |
202 | void *u) { | |
203 | char **vec; | |
204 | int nvec; | |
205 | ||
90b8faa5 | 206 | q->pid = -1; /* =none */ |
460b9539 | 207 | if(!(vec = split(s, &nvec, SPLIT_QUOTES, error_handler, u))) |
208 | return -1; | |
209 | return queue_unmarshall_vec(q, nvec, vec, error_handler, u); | |
210 | } | |
211 | ||
212 | int queue_unmarshall_vec(struct queue_entry *q, int nvec, char **vec, | |
213 | void (*error_handler)(const char *, void *), | |
214 | void *u) { | |
215 | int n; | |
216 | ||
217 | if(nvec % 2 != 0) { | |
218 | error_handler("invalid marshalled queue format", u); | |
219 | return -1; | |
220 | } | |
221 | while(*vec) { | |
222 | D(("key %s value %s", vec[0], vec[1])); | |
ba937f01 | 223 | if((n = TABLE_FIND(fields, name, *vec)) < 0) { |
460b9539 | 224 | error_handler("unknown key in queue data", u); |
225 | return -1; | |
226 | } else { | |
227 | if(fields[n].unmarshall(vec[1], q, fields[n].offset, error_handler, u)) | |
228 | return -1; | |
229 | } | |
230 | vec += 2; | |
231 | } | |
232 | return 0; | |
233 | } | |
234 | ||
460b9539 | 235 | char *queue_marshall(const struct queue_entry *q) { |
236 | unsigned n; | |
237 | const char *vec[sizeof fields / sizeof *fields], *v; | |
238 | char *r, *s; | |
239 | size_t len = 1; | |
240 | ||
241 | for(n = 0; n < sizeof fields / sizeof *fields; ++n) | |
242 | if((v = fields[n].marshall(q, fields[n].offset))) { | |
243 | vec[n] = quoteutf8(v); | |
244 | len += strlen(vec[n]) + strlen(fields[n].name) + 2; | |
245 | } else | |
246 | vec[n] = 0; | |
247 | s = r = xmalloc_noptr(len); | |
248 | for(n = 0; n < sizeof fields / sizeof *fields; ++n) | |
249 | if(vec[n]) { | |
250 | *s++ = ' '; | |
251 | s += strlen(strcpy(s, fields[n].name)); | |
252 | *s++ = ' '; | |
253 | s += strlen(strcpy(s, vec[n])); | |
254 | } | |
255 | return r; | |
256 | } | |
257 | ||
460b9539 | 258 | /* |
259 | Local Variables: | |
260 | c-basic-offset:2 | |
261 | comment-column:40 | |
262 | fill-column:79 | |
263 | End: | |
264 | */ |