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[plomrogue] / src / server / run.c
1 /* src/server/run.c */
2
3 #define _POSIX_C_SOURCE 200809L
4 #include "run.h"
5 #include <stddef.h> /* NULL */
6 #include <stdint.h> /* uint8_t, uint16_t, uint32_t */
7 #include <stdio.h> /* FILE, printf(), fflush() */
8 #include <stdlib.h> /* free() */
9 #include <string.h> /* strlen(), strcmp(), strncmp(), strdup() */
10 #include <unistd.h> /* access() */
11 #include "../common/parse_file.h" /* set_err_line_options(), token_from_line(),
12                                    * err_line(), err_line_inc(), parse_val()
13                                    */
14 #include "../common/readwrite.h" /* try_fopen(), try_fcose(), try_fwrite(),
15                                   * try_fgets(), textfile_width(), try_fputc()
16                                   */
17 #include "../common/rexit.h" /* exit_trouble(), exit_err() */
18 #include "../common/try_malloc.h" /* try_malloc() */
19 #include "ai.h" /* ai() */
20 #include "cleanup.h" /* unset_cleanup_flag() */
21 #include "god_commands.h" /* parse_god_command_1arg() */
22 #include "hardcoded_strings.h" /* s */
23 #include "io.h" /* io_round(), save_world() */
24 #include "things.h" /* Thing, get_thing_action_id_by_name(), get_player() */
25 #include "world.h" /* world */
26
27
28
29 /* If "string" and "comparand" match in string, set "c_to_set" to value."  */
30 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
31                                              char * c_to_set, char value);
32
33 /* Return 1 on world.exists, else 0 and err_line() appropriate error message. */
34 static uint8_t player_commands_allowed();
35
36 /* Parse player command "tok0" with no argument to player action, comment on
37  * invalidity of non-zero "tok1" (but do not abort in that case).
38  */
39 static uint8_t parse_player_command_0arg(char * tok0, char * tok1);
40
41 /* Parse player command "tok0" with one argument "tok1" to player action. */
42 static uint8_t parse_player_command_1arg(char * tok0, char * tok1);
43
44 /* Parse/apply command "tok0" with argument "tok1" and test the line for further
45  * tokens, commenting on their invalidity (but don't abort on finding them).
46  */
47 static uint8_t parse_command_1arg(char * tok0, char * tok1);
48
49
50 /* Compares first line of server out file to world.server_test, aborts if they
51  * don't match, but not before unsetting the flags deleting files in the server
52  * directory, for in that case those must be assumed to belong to another server
53  * process.
54  */
55 static void server_test();
56
57 /* Run the game world and its inhabitants (and their actions) until the player
58  * avatar is free to receive new commands (or is dead).
59  */
60 static void turn_over();
61
62
63
64
65 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
66                                              char * c_to_set, char value)
67 {
68     if (!strcmp(string, comparand))
69     {
70         * c_to_set = value;
71         return 1;
72     }
73     return 0;
74 }
75
76
77
78 static uint8_t player_commands_allowed()
79 {
80     if (!world.exists)
81     {
82         err_line(1, "No world exists in which to run player commands.");
83         return 0;
84     }
85     return 1;
86 }
87
88
89
90 static uint8_t parse_player_command_0arg(char * tok0, char * tok1)
91 {
92     struct Thing * player = get_player();
93     if (!strcmp(tok0, s[S_CMD_WAIT]) || !strcmp(tok0, s[S_CMD_PICKUP]))
94     {
95         if (player_commands_allowed())
96         {
97             player->command = get_thing_action_id_by_name(tok0);
98             player->arg = 0;
99             turn_over();
100             err_line (NULL != tok1, "No arguments expected, ignoring them.");
101         }
102         return 1;
103     }
104     return 0;
105 }
106
107
108
109 static uint8_t parse_player_command_1arg(char * tok0, char * tok1)
110 {
111     struct Thing * player = get_player();
112     if (   (   parse_val(tok0, tok1, s[S_CMD_DROP], '8', (char *) &player->arg)
113             || parse_val(tok0, tok1, s[S_CMD_USE], '8', (char *) &player->arg))
114         && player_commands_allowed())
115     {
116         player->command = get_thing_action_id_by_name(tok0);
117         turn_over();
118     }
119     else if (!strcmp(tok0, s[S_CMD_MOVE]) && player_commands_allowed())
120     {
121         char dir = '\0';
122         if (!(   set_char_by_string_comparison(tok1, "east",       &dir, 'd')
123               || set_char_by_string_comparison(tok1, "south-east", &dir, 'c')
124               || set_char_by_string_comparison(tok1, "south-west", &dir, 'x')
125               || set_char_by_string_comparison(tok1, "west",       &dir, 's')
126               || set_char_by_string_comparison(tok1, "north-west", &dir, 'w')
127               || set_char_by_string_comparison(tok1, "north-east", &dir, 'e')))
128         {
129             return 0;
130         }
131         player->arg = dir;
132         player->command = get_thing_action_id_by_name(tok0);
133         turn_over();
134     }
135     else
136     {
137         return 0;
138     }
139     return 1;
140 }
141
142
143
144 static uint8_t parse_command_1arg(char * tok0, char * tok1)
145 {
146     char * tok2 = token_from_line(NULL);
147     if (   parse_player_command_1arg(tok0, tok1)
148         || parse_god_command_1arg(tok0, tok1));
149     else
150     {
151         return 0;
152     }
153     char * err = "But one argument expected, ignoring further arguments.";
154     err_line (NULL != tok2, err);
155     return 1;
156 }
157
158
159
160 static void server_test()
161 {
162     char test[10 + 1 + 10 + 1 + 1];
163     FILE * file = try_fopen(s[S_PATH_OUT], "r", __func__);
164     try_fgets(test, 10 + 10 + 1 + 1, file, __func__);
165     try_fclose(file, __func__);
166     if (strcmp(test, world.server_test))
167     {
168         unset_cleanup_flag(CLEANUP_WORLDSTATE);
169         unset_cleanup_flag(CLEANUP_OUT);
170         unset_cleanup_flag(CLEANUP_IN);
171         char * msg = "Server test string in server output file does not match. "
172                      "This indicates that the current server process has been "
173                      "superseded by another one.";
174         exit_err(1, msg);
175     }
176 }
177
178
179
180 static void turn_over()
181 {
182     struct Thing * player = get_player();
183     struct Thing * thing = player;
184     uint16_t start_turn = world.turn;
185     while (    0 < player->lifepoints
186            || (0 == player->lifepoints && start_turn == world.turn))
187     {
188         if (NULL == thing)
189         {
190             world.turn++;
191             thing = world.things;
192         }
193         if (0 < thing->lifepoints)
194         {
195             if (0 == thing->command)
196             {
197                 if (thing == player)
198                 {
199                     break;
200                 }
201                 ai(thing);
202             }
203             thing->progress++;
204
205             struct ThingAction * ta = get_thing_action(thing->command);
206             if (thing->progress == ta->effort)
207             {
208                 ta->func(thing);
209                 thing->command = 0;
210                 thing->progress = 0;
211             }
212         }
213         thing = thing->next;
214     }
215 }
216
217
218
219 static void record_msg(char * msg)
220 {
221     char * path_tmp;
222     FILE * file_tmp = atomic_write_start(s[S_PATH_RECORD], &path_tmp);
223     if (!access(s[S_PATH_RECORD], F_OK))
224     {
225         FILE * file_read = try_fopen(s[S_PATH_RECORD], "r", __func__);
226         uint32_t linemax = textfile_width(file_read);
227         char * line = try_malloc(linemax + 1, __func__);
228         while (try_fgets(line, linemax + 1, file_read, __func__))
229         {
230             try_fwrite(line, strlen(line), 1, file_tmp, __func__);
231         }
232         free(line);
233         try_fclose(file_read, __func__);
234     }
235     try_fwrite(msg, strlen(msg), 1, file_tmp, __func__);
236     try_fputc('\n', file_tmp, __func__);
237     atomic_write_finish(file_tmp, s[S_PATH_RECORD], path_tmp);
238 }
239
240
241
242 extern void obey_msg(char * msg, uint8_t do_record, uint8_t do_verbose)
243 {
244     if (world.is_verbose && do_verbose)
245     {
246         exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
247     }
248     set_err_line_options("Trouble with message: ", msg, 0);
249     char * msg_copy = strdup(msg);
250     char * tok0 = token_from_line(msg_copy);
251     if (NULL != tok0)
252     {
253         char * tok1 = token_from_line(NULL);
254         if (    parse_player_command_0arg(tok0, tok1)
255             || (tok1 && parse_command_1arg(tok0, tok1)))
256         {
257             if (world.exists)
258             {
259                 world.do_update = 1;
260             }
261             if (do_record)
262             {
263                 save_world();
264                 record_msg(msg);
265             }
266             free(msg_copy);
267             return;
268         }
269     }
270     err_line(1, "Unknown command/argument or bad number of tokens.");
271     free(msg_copy);
272 }
273
274
275
276 extern uint8_t io_loop()
277 {
278     while (1)
279     {
280         server_test();
281         char * msg = io_round();
282         if (NULL == msg)
283         {
284             continue;
285         }
286         if (world.is_verbose)
287         {
288             exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
289         }
290         if (!strcmp("QUIT", msg))
291         {
292             free(msg);
293             return 1;
294         }
295         if (!strcmp("PING", msg))
296         {
297             free(msg);
298             char * pong = "PONG\n";
299             try_fwrite(pong, strlen(pong), 1, world.file_out, __func__);
300             fflush(world.file_out);
301             continue;
302         }
303         if (world.replay)
304         {
305             free(msg);
306             return 0;
307         }
308         obey_msg(msg, 1, 0);
309         free(msg);
310     }
311 }