src/power/SDL_power.c
author Ozkan Sezer <sezeroz@gmail.com>
Mon, 15 Oct 2018 11:01:00 +0300
changeset 12331 43d46306c3ba
parent 11811 5d94cb6b24d3
child 12503 806492103856
permissions -rw-r--r--
SDL_power.c: Adjust SDL_POWER_DISABLED ifdefs to avoid zero-size array

Otherwise if SDL_POWER_DISABLED is disabled (eg with --disable-power):

... with clang -pedantic:
src/power/SDL_power.c:48:50: warning: use of GNU empty initializer extension [-Wgnu-empty-initializer]
static SDL_GetPowerInfo_Impl implementations[] = {
^
src/power/SDL_power.c:48:50: warning: zero size arrays are an extension [-Wzero-length-array]
2 warnings generated.

... with gcc -pedantic:
src/power/SDL_power.c:48:50: warning: ISO C forbids empty initializer braces [-Wpedantic]
src/power/SDL_power.c:48:50: warning: ISO C forbids empty initializer braces [-Wpedantic]
static SDL_GetPowerInfo_Impl implementations[] = {
^
src/power/SDL_power.c:48:30: error: zero or negative size array ‘implementations’
static SDL_GetPowerInfo_Impl implementations[] = {
^~~~~~~~~~~~~~~

... with Watcom:
./src/power/SDL_power.c(85): Error! E1112: Initializer list cannot be empty
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#include "SDL_power.h"
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#include "SDL_syspower.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,
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                              int *percent);
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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 */
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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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static SDL_GetPowerInfo_Impl implementations[] = {
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#ifdef SDL_POWER_LINUX          /* in order of preference. More than could work. */
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    SDL_GetPowerInfo_Linux_org_freedesktop_upower,
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    SDL_GetPowerInfo_Linux_sys_class_power_supply,
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    SDL_GetPowerInfo_Linux_proc_acpi,
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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_UIKIT          /* handles iPhone/iPad/etc */
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    SDL_GetPowerInfo_UIKit,
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#endif
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#ifdef SDL_POWER_MACOSX         /* handles Mac OS X, Darwin. */
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    SDL_GetPowerInfo_MacOSX,
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#endif
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#ifdef SDL_POWER_HAIKU          /* with BeOS euc.jp apm driver. Does this work on Haiku? */
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    SDL_GetPowerInfo_Haiku,
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#endif
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#ifdef SDL_POWER_ANDROID        /* handles Android. */
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    SDL_GetPowerInfo_Android,
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#endif
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#ifdef SDL_POWER_PSP        /* handles PSP. */
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    SDL_GetPowerInfo_PSP,
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#endif
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#ifdef SDL_POWER_WINRT          /* handles WinRT */
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    SDL_GetPowerInfo_WinRT,
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#endif
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#ifdef SDL_POWER_EMSCRIPTEN     /* handles Emscripten */
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    SDL_GetPowerInfo_Emscripten,
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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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};
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#endif
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SDL_PowerState
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SDL_GetPowerInfo(int *seconds, int *percent)
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{
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#ifndef SDL_POWER_DISABLED
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    const int total = sizeof(implementations) / sizeof(implementations[0]);
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    SDL_PowerState retval = SDL_POWERSTATE_UNKNOWN;
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    int i;
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#endif
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    int _seconds, _percent;
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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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#ifndef SDL_POWER_DISABLED
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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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#endif
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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: */