src/power/SDL_power.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 07 Jun 2009 06:06:35 +0000
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Initial work on power subsystem for SDL 1.3.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_power.h"
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/*
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 * Returns SDL_TRUE if we have a definitive answer.
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 * SDL_FALSE to try next implementation.
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 */
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typedef SDL_bool
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(*SDL_GetPowerInfo_Impl)(SDL_PowerState *state, int *seconds, int *percent);
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SDL_bool SDL_GetPowerInfo_Linux_sys_power(SDL_PowerState*, int*, int*);
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SDL_bool SDL_GetPowerInfo_Linux_proc_apci(SDL_PowerState*, int*, int*);
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SDL_bool SDL_GetPowerInfo_Linux_proc_apm(SDL_PowerState*, int*, int*);
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SDL_bool SDL_GetPowerInfo_Windows(SDL_PowerState*, int*, int*);
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SDL_bool SDL_GetPowerInfo_MacOSX(SDL_PowerState*, int*, int*);
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SDL_bool SDL_GetPowerInfo_OS2(SDL_PowerState*, int*, int*);
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SDL_bool SDL_GetPowerInfo_NintendoDS(SDL_PowerState*, int*, int*);
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#ifndef SDL_POWER_DISABLED
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#ifdef SDL_POWER_HARDWIRED
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/* This is for things that _never_ have a battery, like the Dreamcast, etc. */
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static SDL_bool
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SDL_GetPowerInfo_Hardwired(SDL_PowerState *state, int *seconds, int *percent)
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{
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    *seconds = -1;
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    *percent = -1;
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    *state = SDL_POWERSTATE_NO_BATTERY;
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    return SDL_TRUE;
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}
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#endif
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#endif
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static SDL_GetPowerInfo_Impl implementations[] = {
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#ifndef SDL_POWER_DISABLED
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#ifdef SDL_POWER_LINUX /* in order of preference. More than could work. */
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    SDL_GetPowerInfo_Linux_sys_power,
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    SDL_GetPowerInfo_Linux_proc_apci,
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    SDL_GetPowerInfo_Linux_proc_apm,
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#endif
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#ifdef SDL_POWER_WINDOWS /* handles Win32, Win64, PocketPC. */
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    SDL_GetPowerInfo_Windows,
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#endif
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#ifdef SDL_POWER_MACOSX  /* handles Mac OS X, Darwin, iPhone. */
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    SDL_GetPowerInfo_MacOSX,
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#endif
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#ifdef SDL_POWER_OS2  /* handles OS/2, Warp, eComStation. */
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    SDL_GetPowerInfo_OS2,
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#endif
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#ifdef SDL_POWER_NINTENDODS  /* handles Nintendo DS. */
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    SDL_GetPowerInfo_NintendoDS,
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#endif
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#ifdef SDL_POWER_HARDWIRED
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    SDL_GetPowerInfo_Hardwired,
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#endif
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#endif
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};
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SDL_PowerState
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SDL_GetPowerInfo(int *seconds, int *percent)
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{
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    const int total = sizeof (implementations) / sizeof (implementations[0]);
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    int _seconds, _percent;
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    SDL_PowerState retval;
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    int i;
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    /* Make these never NULL for platform-specific implementations. */
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    if (seconds == NULL) {
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        seconds = &_seconds;
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    }
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    if (percent == NULL) {
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        percent = &_percent;
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    }
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    for (i = 0; i < total; i++) {
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        if (implementations[i](&retval, seconds, percent)) {
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            return retval;
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        }
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    }
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    /* nothing was definitive. */
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    *seconds = -1;
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    *percent = -1;
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    return SDL_POWERSTATE_UNKNOWN;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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