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SDL_power.c (3524B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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 #include "SDL_power.h"
     23 #include "SDL_syspower.h"
     24 
     25 /*
     26  * Returns SDL_TRUE if we have a definitive answer.
     27  * SDL_FALSE to try next implementation.
     28  */
     29 typedef SDL_bool
     30     (*SDL_GetPowerInfo_Impl) (SDL_PowerState * state, int *seconds,
     31                               int *percent);
     32 
     33 #ifndef SDL_POWER_DISABLED
     34 #ifdef SDL_POWER_HARDWIRED
     35 /* This is for things that _never_ have a battery */
     36 static SDL_bool
     37 SDL_GetPowerInfo_Hardwired(SDL_PowerState * state, int *seconds, int *percent)
     38 {
     39     *seconds = -1;
     40     *percent = -1;
     41     *state = SDL_POWERSTATE_NO_BATTERY;
     42     return SDL_TRUE;
     43 }
     44 #endif
     45 
     46 static SDL_GetPowerInfo_Impl implementations[] = {
     47 #ifdef SDL_POWER_LINUX          /* in order of preference. More than could work. */
     48     SDL_GetPowerInfo_Linux_org_freedesktop_upower,
     49     SDL_GetPowerInfo_Linux_sys_class_power_supply,
     50     SDL_GetPowerInfo_Linux_proc_acpi,
     51     SDL_GetPowerInfo_Linux_proc_apm,
     52 #endif
     53 #ifdef SDL_POWER_WINDOWS        /* handles Win32, Win64, PocketPC. */
     54     SDL_GetPowerInfo_Windows,
     55 #endif
     56 #ifdef SDL_POWER_UIKIT          /* handles iPhone/iPad/etc */
     57     SDL_GetPowerInfo_UIKit,
     58 #endif
     59 #ifdef SDL_POWER_MACOSX         /* handles Mac OS X, Darwin. */
     60     SDL_GetPowerInfo_MacOSX,
     61 #endif
     62 #ifdef SDL_POWER_HAIKU          /* with BeOS euc.jp apm driver. Does this work on Haiku? */
     63     SDL_GetPowerInfo_Haiku,
     64 #endif
     65 #ifdef SDL_POWER_ANDROID        /* handles Android. */
     66     SDL_GetPowerInfo_Android,
     67 #endif
     68 #ifdef SDL_POWER_PSP        /* handles PSP. */
     69     SDL_GetPowerInfo_PSP,
     70 #endif
     71 #ifdef SDL_POWER_WINRT          /* handles WinRT */
     72     SDL_GetPowerInfo_WinRT,
     73 #endif
     74 #ifdef SDL_POWER_EMSCRIPTEN     /* handles Emscripten */
     75     SDL_GetPowerInfo_Emscripten,
     76 #endif
     77 
     78 #ifdef SDL_POWER_HARDWIRED
     79     SDL_GetPowerInfo_Hardwired,
     80 #endif
     81 };
     82 #endif
     83 
     84 SDL_PowerState
     85 SDL_GetPowerInfo(int *seconds, int *percent)
     86 {
     87 #ifndef SDL_POWER_DISABLED
     88     const int total = sizeof(implementations) / sizeof(implementations[0]);
     89     SDL_PowerState retval = SDL_POWERSTATE_UNKNOWN;
     90     int i;
     91 #endif
     92 
     93     int _seconds, _percent;
     94     /* Make these never NULL for platform-specific implementations. */
     95     if (seconds == NULL) {
     96         seconds = &_seconds;
     97     }
     98     if (percent == NULL) {
     99         percent = &_percent;
    100     }
    101 
    102 #ifndef SDL_POWER_DISABLED
    103     for (i = 0; i < total; i++) {
    104         if (implementations[i](&retval, seconds, percent)) {
    105             return retval;
    106         }
    107     }
    108 #endif
    109 
    110     /* nothing was definitive. */
    111     *seconds = -1;
    112     *percent = -1;
    113     return SDL_POWERSTATE_UNKNOWN;
    114 }
    115 
    116 /* vi: set ts=4 sw=4 expandtab: */