input: rework how input sources are added

Until now, there were two functions to add input sources (stuff like
stdin input, slave mode, lirc, joystick). Unify them to a single
function (mp_input_add_fd()), and make sure the associated callbacks
always have a context parameter.

Change the lirc and joystick code such that they take store their state
in a context struct (probably worthless), and use the new mp_msg
replacements (the point of this refactoring).

Additionally, get rid of the ugly USE_FD0_CMD_SELECT etc. ifdeffery in
the terminal handling code.

osdep/terminal-unix.c

@@ -358,7 +358,7 @@ static void walk_buf(unsigned int count) {
         getch2_pos = 0;
 }
 
-bool getch2(struct input_ctx *input_ctx)
+static bool getch2(struct input_ctx *input_ctx)
 {
     int retval = read(0, &getch2_buf[getch2_pos], BUF_LEN - getch2_len - getch2_pos);
     /* Return false on EOF to stop running select() on the FD, as it'd
@@ -437,6 +437,18 @@ bool getch2(struct input_ctx *input_ctx)
     return true;
 }
 
+static int read_keys(void *ctx, int fd)
+{
+    if (getch2(ctx))
+        return MP_INPUT_NOTHING;
+    return MP_INPUT_DEAD;
+}
+
+void terminal_setup_getch(struct input_ctx *ictx)
+{
+    mp_input_add_fd(ictx, 0, 1, NULL, read_keys, NULL, ictx);
+}
+
 static volatile int getch2_active  = 0;
 static volatile int getch2_enabled = 0;
 
@@ -593,6 +605,11 @@ void terminal_set_foreground_color(FILE *stream, int c)
     }
 }
 
+void terminal_setup_stdin_cmd_input(struct input_ctx *ictx)
+{
+    mp_input_add_fd(ictx, 0, 1, input_default_read_cmd, NULL, NULL, NULL);
+}
+
 int terminal_init(void)
 {
     load_termcap(NULL);

osdep/terminal-win.c

@@ -33,6 +33,10 @@
 #include "input/input.h"
 #include "terminal.h"
 
+int screen_width = 80;
+int screen_height = 24;
+char *erase_to_end_of_line = NULL;
+
 #define hSTDOUT GetStdHandle(STD_OUTPUT_HANDLE)
 #define hSTDERR GetStdHandle(STD_ERROR_HANDLE)
 static short stdoutAttrs = 0;
@@ -47,7 +51,7 @@ static const unsigned char ansi2win32[8] = {
     FOREGROUND_BLUE  | FOREGROUND_GREEN | FOREGROUND_RED,
 };
 
-int mp_input_slave_cmd_func(int fd, char *dest, int size)
+static int mp_input_slave_cmd_func(void *ctx, int fd, char *dest, int size)
 {
     DWORD retval;
     HANDLE in = GetStdHandle(STD_INPUT_HANDLE);
@@ -66,9 +70,10 @@ int mp_input_slave_cmd_func(int fd, char *dest, int size)
     return MP_INPUT_NOTHING;
 }
 
-int screen_width = 80;
-int screen_height = 24;
-char *erase_to_end_of_line = NULL;
+void terminal_setup_stdin_cmd_input(struct input_ctx *ictx)
+{
+    mp_input_add_fd(ictx, 0, 0, mp_input_slave_cmd_func, NULL, NULL, NULL);
+}
 
 void get_screen_size(void)
 {
@@ -172,7 +177,7 @@ static int getch2_internal(void)
     return -1;
 }
 
-bool getch2(struct input_ctx *ctx)
+static bool getch2(struct input_ctx *ctx)
 {
     int r = getch2_internal();
     if (r >= 0)
@@ -180,6 +185,18 @@ bool getch2(struct input_ctx *ctx)
     return true;
 }
 
+static int read_keys(void *ctx, int fd)
+{
+    if (getch2(ctx))
+        return MP_INPUT_NOTHING;
+    return MP_INPUT_DEAD;
+}
+
+void terminal_setup_getch(struct input_ctx *ictx)
+{
+    mp_input_add_fd(ictx, 0, 1, NULL, read_keys, NULL, ictx);
+}
+
 void getch2_poll(void)
 {
 }

osdep/terminal.h

@@ -27,6 +27,8 @@
 #include <stdbool.h>
 #include <stdio.h>
 
+struct input_ctx;
+
 /* Screen size. Initialized by load_termcap() and get_screen_size() */
 extern int screen_width;
 extern int screen_height;
@@ -37,6 +39,12 @@ extern char * erase_to_end_of_line;
 /* Global initialization for terminal output. */
 int terminal_init(void);
 
+/* Setup ictx to read input commands from stdin (slave mode) */
+void terminal_setup_stdin_cmd_input(struct input_ctx *ictx);
+
+/* Setup ictx to read keys from the terminal */
+void terminal_setup_getch(struct input_ctx *ictx);
+
 /* Return whether the process has been backgrounded. */
 bool terminal_in_background(void);
 
@@ -54,18 +62,4 @@ void getch2_disable(void);
 /* Enable and disable STDIN line-buffering */
 void getch2_poll(void);
 
-/* Read a character or a special key code (see keycodes.h) */
-struct input_ctx;
-bool getch2(struct input_ctx *ictx);
-
-#if defined(__MINGW32__)
-// slave cmd function for Windows
-int mp_input_slave_cmd_func(int fd,char* dest,int size);
-#define USE_FD0_CMD_SELECT  0
-#define MP_INPUT_SLAVE_CMD_FUNC     mp_input_slave_cmd_func
-#else
-#define USE_FD0_CMD_SELECT  1
-#define MP_INPUT_SLAVE_CMD_FUNC     NULL
-#endif
-
 #endif /* MPLAYER_GETCH2_H */