/* src/client/io.c */
+#define _POSIX_C_SOURCE 1 /* PIPE_BUF */
#include "io.h"
-#include <errno.h> /* global errno */
-#include <fcntl.h> /* open() */
#include <limits.h> /* PIPE_BUF */
#include <ncurses.h> /* halfdelay(), getch() */
#include <stddef.h> /* NULL */
#include <stdint.h> /* uint8_t, uint16_t, uint32_t */
-#include <stdio.h> /* FILE, sprintf(), fseek() */
+#include <stdio.h> /* FILE, sprintf(), fseek(), fflush() */
#include <string.h> /* strcmp(), strlen(), memcpy() */
#include <stdlib.h> /* free(), atoi() */
#include <sys/stat.h> /* stat() */
-#include <unistd.h> /* access(), write() */
+#include <sys/types.h> /* time_t */
+#include <time.h> /* time() */
+#include <unistd.h> /* access() */
#include "../common/try_malloc.h" /* try_malloc() */
#include "../common/rexit.h" /* exit_trouble(), exit_err() */
#include "../common/readwrite.h" /* try_fopen(), try_fclose(), try_fgets(),
- * try_fgetc(), textfile_width()
+ * try_fgetc(), textfile_width(), try_fputc()
*/
#include "control.h" /* try_key() */
#include "map.h" /* map_center() */
-#include "misc.h" /* reset_windows() */
#include "windows.h" /* reset_windows_on_winch(), draw_all_wins() */
#include "world.h" /* world global */
*/
static void read_inventory(char * read_buf, uint32_t linemax, FILE * file);
-/* Read the next characters in "file" into world.map.cells. In detail: Read
- * world.map.size.y times world.map.size.x characters, followed by one ignored
+/* Read the next characters in "file" into "map". In detail: Read
+ * world.map.length times world.map.length characters, followed by one ignored
* character (that we assume is a newline).
*/
-static void read_map_cells(FILE * file);
+static void read_map_cells(FILE * file, char ** map);
/* Repeatedly use try_fgets() with given arguments to read the remaining lines
* of "file" into the world.log string.
static uint16_t read_value_from_line(char * read_buf, uint32_t linemax,
FILE * file);
-/* If the server's out file has changed since the last read_world(), return a
- * pointer to its file descriptor; else, return NULL.
+/* If the server's worldstate file has changed since the last read_world(),
+ * return a pointer to its file descriptor; else, return NULL.
*
* Two tests are performed to check for a file change. The file's last data
* modification time in seconds via stat() is compared against world.last_update
* the new world also starts in turn 1, not signifying any world change to the
* turn check. The stat() check detects this change with at most 1 second delay.
*/
-static FILE * changed_server_out_file(char * path);
+static FILE * changed_worldstate_file(char * path);
-/* Attempt to read the server's out file as representation of the game world in
- * a hard-coded serialization format. Returns 1 on success and 0 if the out file
- * wasn't read for supposedly not having changed since a last read_world() call.
+/* Attempt to read the server's worldstate file as representation of the game
+ * world in a hard-coded serialization format. Returns 1 on success and 0 if the
+ * out file wasn't read for supposedly not having changed since a last
+ * read_world() call.
*
- * map_center() is triggered by the first successful read_world() or on turn 1,
- * so the client focuses the map window on the player on client and world start.
+ * map_center() is triggered by either, the first successful read_world() (thus
+ * on client start), or on turn 1 (thus on world start).
*/
static uint8_t read_world();
+/* If "last_server_answer_time" is too old, send a PING to the server; or, if a
+ * previous PING has not sparked any answer after a while, abort the client.
+ */
+static void test_ping_pong(time_t last_server_answer_time);
+
+/* Update "last_server_answer_time" if new stuff has been written to the
+ * server's out file.
+ */
+static void test_server_activity(time_t * last_server_answer_time);
+
static void read_inventory(char * read_buf, uint32_t linemax, FILE * file)
{
- char * f_name = "read_inventory()";
char * delimiter = "%\n";
free(world.player_inventory);
world.player_inventory = NULL; /* Avoids illegal strlen() below. */
while (1)
{
- try_fgets(read_buf, linemax + 1, file, f_name);
+ try_fgets(read_buf, linemax + 1, file, __func__);
if (!(strcmp(read_buf, delimiter)))
{
break;
old_size = strlen(world.player_inventory);
}
int new_size = strlen(read_buf);
- char * new_inventory = try_malloc(old_size + new_size + 1, f_name);
+ char * new_inventory = try_malloc(old_size + new_size + 1, __func__);
memcpy(new_inventory, world.player_inventory, old_size);
- sprintf(new_inventory + old_size, "%s", read_buf);
+ int test = sprintf(new_inventory + old_size, "%s", read_buf);
+ exit_trouble(test < 0, __func__, "sprintf");
free(world.player_inventory);
world.player_inventory = new_inventory;
}
-static void read_map_cells(FILE * file)
+static void read_map_cells(FILE * file, char ** map)
{
- char * f_name = "read_map_cells()";
- free(world.map.cells);
- world.map.cells = try_malloc(world.map.size.y * world.map.size.x, f_name);
+ if (*map)
+ {
+ free(*map);
+ *map = NULL;
+ }
+ *map = try_malloc(world.map.length * world.map.length, __func__);
+ char * map_cells = *map;
uint16_t y, x;
- for (y = 0; y < world.map.size.y; y++)
+ for (y = 0; y < world.map.length; y++)
{
- for (x = 0; x < world.map.size.x; x++)
+ for (x = 0; x < world.map.length; x++)
{
- char c = try_fgetc(file, f_name);
- world.map.cells[(y * world.map.size.x) + x] = c;
+ char c = try_fgetc(file, __func__);
+ map_cells[y * world.map.length + x] = c;
}
- try_fgetc(file, f_name);
+ try_fgetc(file, __func__);
}
}
static void read_log(char * read_buf, uint32_t linemax, FILE * file)
{
- char * f_name = "read_log()";
free(world.log);
world.log = NULL;
- while (try_fgets(read_buf, linemax + 1, file, f_name))
+ while (try_fgets(read_buf, linemax + 1, file, __func__))
{
int old_size = 0;
if (NULL != world.log)
old_size = strlen(world.log);
}
int new_size = strlen(read_buf);
- char * new_log = try_malloc(old_size + new_size + 1, f_name);
+ char * new_log = try_malloc(old_size + new_size + 1, __func__);
memcpy(new_log, world.log, old_size);
- sprintf(new_log + old_size, "%s", read_buf);
+ int test = sprintf(new_log + old_size, "%s", read_buf);
+ exit_trouble(test < 0, __func__, "sprintf");
free(world.log);
world.log = new_log;
}
static uint16_t read_value_from_line(char * read_buf, uint32_t linemax,
FILE * file)
{
- char * f_name = "read_value_from_line()";
- try_fgets(read_buf, linemax + 1, file, f_name);
+ try_fgets(read_buf, linemax + 1, file, __func__);
return atoi(read_buf);
}
-static FILE * changed_server_out_file(char * path)
+static FILE * changed_worldstate_file(char * path)
{
- char * f_name = "changed_server_out_file()";
struct stat stat_buf;
- exit_trouble(stat(path, &stat_buf), f_name, "stat()");
+ exit_trouble(stat(path, &stat_buf), __func__, "stat");
if (stat_buf.st_mtime != world.last_update)
{
world.last_update = stat_buf.st_mtime;
- return try_fopen(path, "r", f_name);
+ return try_fopen(path, "r", __func__);
}
- FILE * file = try_fopen(path, "r", f_name);
+ FILE * file = try_fopen(path, "r", __func__);
char turn_string[6];
- try_fgets(turn_string, 6, file, f_name);
+ try_fgets(turn_string, 6, file, __func__);
if (world.turn == atoi(turn_string))
{
- try_fclose(file, f_name);
+ try_fclose(file, __func__);
return NULL;
}
- exit_trouble(fseek(file, 0, SEEK_SET), f_name, "fseek()");
+ exit_trouble(fseek(file, 0, SEEK_SET), __func__, "fseek");
return file;
}
static uint8_t read_world()
{
- char * f_name = "read_world()";
- char * path = "server/out";
- char * quit_msg = "No server out file found to read. Server may be down.";
+ char * path = "server/worldstate";
+ char * quit_msg = "No worldstate file found to read. Server may be down.";
static uint8_t first_read = 1;
exit_err(access(path, F_OK), quit_msg);
- FILE * file = changed_server_out_file(path);
+ FILE * file = changed_worldstate_file(path);
if (!file)
{
return 0;
}
uint32_t linemax = textfile_width(file);
- char * read_buf = try_malloc(linemax + 1, f_name);
+ char * read_buf = try_malloc(linemax + 1, __func__);
world.turn = read_value_from_line(read_buf, linemax, file);
- world.player_score = read_value_from_line(read_buf, linemax, file);
world.player_lifepoints = read_value_from_line(read_buf, linemax, file);
read_inventory(read_buf, linemax, file);
world.player_pos.y = read_value_from_line(read_buf, linemax, file);
map_center();
first_read = 0;
}
- world.map.size.y = read_value_from_line(read_buf, linemax, file);
- world.map.size.x = read_value_from_line(read_buf, linemax, file);
- read_map_cells(file);
+ world.map.length = read_value_from_line(read_buf, linemax, file);
+ read_map_cells(file, &world.map.cells);
+ read_map_cells(file, &world.mem_map);
read_log(read_buf, linemax, file);
free(read_buf);
- try_fclose(file, f_name);
+ try_fclose(file, __func__);
return 1;
}
-extern void try_send(char * msg)
+static void test_ping_pong(time_t last_server_answer_time)
{
- char * f_name = "try_send()";
- uint32_t msg_size = strlen(msg) + 1;
- char * err = "try_send() tries to send message larger than PIPE_BUF bytes.";
- exit_err(msg_size > PIPE_BUF, err);
- int fd_out;
- uint16_t j = 1;
- while (0 != j)
+ static uint8_t ping_sent = 0;
+ time_t now = time(0);
+ if (ping_sent && last_server_answer_time > now - 3)
{
- fd_out = open(world.path_server_in, O_WRONLY | O_NONBLOCK);
- if (fd_out > 0)
- {
- break;
- }
- exit_err(-1 == fd_out && ENXIO != errno, "Server fifo not found.");
- j++;
+ ping_sent = 0;
}
- exit_err(0 == j, "Failed to open server fifo for writing.");
- j = 1;
- while (0 != j)
+ if (!ping_sent && last_server_answer_time < now - 3)
{
- int test = write(fd_out, msg, msg_size);
- if (test > 0)
- {
- break;
- }
- j++;
+ send("PING");
+ ping_sent = 1;
+ return;
+ }
+ exit_err(last_server_answer_time < now - 6, "Server not answering.");
+}
+
+
+
+static void test_server_activity(time_t * last_server_answer_time)
+{
+ int test = try_fgetc(world.file_server_out, __func__);
+ if (EOF == test)
+ {
+ return;
+ }
+ do
+ {
+ ;
}
- exit_err(0 == j, "Failed to write to server fifo.");
- exit_trouble(-1 == close(fd_out), f_name, "close()");
+ while (EOF != (test = try_fgetc(world.file_server_out, __func__)));
+ * last_server_answer_time = time(0);
+}
+
+
+
+extern void send(char * msg)
+{
+ uint32_t msg_size = strlen(msg) + 1;
+ char * err = "send() tries to send message larger than PIPE_BUF bytes.";
+ exit_err(msg_size > PIPE_BUF, err);
+ try_fwrite(msg, strlen(msg), 1, world.file_server_in, __func__);
+ try_fputc('\n', world.file_server_in, __func__);
+ fflush(world.file_server_in);
}
world.halfdelay = 1; /* Ensures read_world() is only called 10 */
halfdelay(world.halfdelay); /* times a second during user inactivity. */
uint8_t change_in_client = 0;
+ uint16_t last_focused_turn = world.turn;
+ time_t last_server_answer_time = time(0);
while (1)
{
+ test_server_activity(&last_server_answer_time);
+ test_ping_pong(last_server_answer_time);
if (world.winch)
{
reset_windows_on_winch();
world.winch = 0;
change_in_client++;
}
- if (read_world() || change_in_client)
+ if (change_in_client || read_world())
{
+ if (world.turn != last_focused_turn && world.focus_each_turn)
+ {
+ last_focused_turn = world.turn;
+ map_center();
+ }
draw_all_wins();
}
change_in_client = 0;
}
}
}
- try_send("QUIT");
+ send("QUIT");
return "Sent QUIT to server.";
}