SDL  2.0
SDL_sysjoystick.c
Go to the documentation of this file.
1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22 
23 #if defined(SDL_JOYSTICK_DUMMY) || defined(SDL_JOYSTICK_DISABLED)
24 
25 /* This is the dummy implementation of the SDL joystick API */
26 
27 #include "SDL_joystick.h"
28 #include "../SDL_sysjoystick.h"
29 #include "../SDL_joystick_c.h"
30 
31 /* Function to scan the system for joysticks.
32  * It should return 0, or -1 on an unrecoverable fatal error.
33  */
34 int
36 {
37  return 0;
38 }
39 
41 {
42  return 0;
43 }
44 
46 {
47 }
48 
49 /* Function to get the device-dependent name of a joystick */
50 const char *
51 SDL_SYS_JoystickNameForDeviceIndex(int device_index)
52 {
53  SDL_SetError("Logic error: No joysticks available");
54  return (NULL);
55 }
56 
57 /* Function to perform the mapping from device index to the instance id for this index */
59 {
60  return device_index;
61 }
62 
63 /* Function to open a joystick for use.
64  The joystick to open is specified by the device index.
65  This should fill the nbuttons and naxes fields of the joystick structure.
66  It returns 0, or -1 if there is an error.
67  */
68 int
69 SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
70 {
71  return SDL_SetError("Logic error: No joysticks available");
72 }
73 
74 /* Function to determine if this joystick is attached to the system right now */
75 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
76 {
77  return SDL_TRUE;
78 }
79 
80 /* Function to update the state of a joystick - called as a device poll.
81  * This function shouldn't update the joystick structure directly,
82  * but instead should call SDL_PrivateJoystick*() to deliver events
83  * and update joystick device state.
84  */
85 void
86 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
87 {
88 }
89 
90 /* Function to close a joystick after use */
91 void
92 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
93 {
94 }
95 
96 /* Function to perform any system-specific joystick related cleanup */
97 void
99 {
100 }
101 
103 {
104  SDL_JoystickGUID guid;
105  /* the GUID is just the first 16 chars of the name for now */
106  const char *name = SDL_SYS_JoystickNameForDeviceIndex( device_index );
107  SDL_zero( guid );
108  SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
109  return guid;
110 }
111 
112 
113 SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
114 {
115  SDL_JoystickGUID guid;
116  /* the GUID is just the first 16 chars of the name for now */
117  const char *name = joystick->name;
118  SDL_zero( guid );
119  SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
120  return guid;
121 }
122 
123 #endif /* SDL_JOYSTICK_DUMMY || SDL_JOYSTICK_DISABLED */
124 
125 /* vi: set ts=4 sw=4 expandtab: */
#define SDL_min(x, y)
Definition: SDL_stdinc.h:345
int SDL_SYS_NumJoysticks()
GLuint const GLchar * name
void SDL_SYS_JoystickQuit(void)
SDL_bool
Definition: SDL_stdinc.h:126
#define SDL_memcpy
Sint32 SDL_JoystickID
Definition: SDL_joystick.h:72
SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
void SDL_SYS_JoystickDetect()
#define SDL_zero(x)
Definition: SDL_stdinc.h:355
const char * SDL_SYS_JoystickNameForDeviceIndex(int device_index)
void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick *joystick)
int SDL_SYS_JoystickInit(void)
#define NULL
Definition: begin_code.h:143
#define SDL_SetError
#define SDL_strlen
SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
int SDL_SYS_JoystickOpen(SDL_Joystick *joystick, int device_index)
void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
SDL_JoystickGUID SDL_SYS_JoystickGetDeviceGUID(int device_index)