Initial work on power subsystem for SDL 1.3.

src/power/SDL_power.c

@@ -0,0 +1,110 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+#include "SDL_power.h"
+
+/*
+ * Returns SDL_TRUE if we have a definitive answer.
+ * SDL_FALSE to try next implementation.
+ */
+typedef SDL_bool
+(*SDL_GetPowerInfo_Impl)(SDL_PowerState *state, int *seconds, int *percent);
+
+SDL_bool SDL_GetPowerInfo_Linux_sys_power(SDL_PowerState*, int*, int*);
+SDL_bool SDL_GetPowerInfo_Linux_proc_apci(SDL_PowerState*, int*, int*);
+SDL_bool SDL_GetPowerInfo_Linux_proc_apm(SDL_PowerState*, int*, int*);
+SDL_bool SDL_GetPowerInfo_Windows(SDL_PowerState*, int*, int*);
+SDL_bool SDL_GetPowerInfo_MacOSX(SDL_PowerState*, int*, int*);
+SDL_bool SDL_GetPowerInfo_OS2(SDL_PowerState*, int*, int*);
+SDL_bool SDL_GetPowerInfo_NintendoDS(SDL_PowerState*, int*, int*);
+
+#ifndef SDL_POWER_DISABLED
+#ifdef SDL_POWER_HARDWIRED
+/* This is for things that _never_ have a battery, like the Dreamcast, etc. */
+static SDL_bool
+SDL_GetPowerInfo_Hardwired(SDL_PowerState *state, int *seconds, int *percent)
+{
+    *seconds = -1;
+    *percent = -1;
+    *state = SDL_POWERSTATE_NO_BATTERY;
+    return SDL_TRUE;
+}
+#endif
+#endif
+
+
+static SDL_GetPowerInfo_Impl implementations[] = {
+#ifndef SDL_POWER_DISABLED
+#ifdef SDL_POWER_LINUX /* in order of preference. More than could work. */
+    SDL_GetPowerInfo_Linux_sys_power,
+    SDL_GetPowerInfo_Linux_proc_apci,
+    SDL_GetPowerInfo_Linux_proc_apm,
+#endif
+#ifdef SDL_POWER_WINDOWS /* handles Win32, Win64, PocketPC. */
+    SDL_GetPowerInfo_Windows,
+#endif
+#ifdef SDL_POWER_MACOSX  /* handles Mac OS X, Darwin, iPhone. */
+    SDL_GetPowerInfo_MacOSX,
+#endif
+#ifdef SDL_POWER_OS2  /* handles OS/2, Warp, eComStation. */
+    SDL_GetPowerInfo_OS2,
+#endif
+#ifdef SDL_POWER_NINTENDODS  /* handles Nintendo DS. */
+    SDL_GetPowerInfo_NintendoDS,
+#endif
+#ifdef SDL_POWER_HARDWIRED
+    SDL_GetPowerInfo_Hardwired,
+#endif
+#endif
+};
+
+SDL_PowerState
+SDL_GetPowerInfo(int *seconds, int *percent)
+{
+    const int total = sizeof (implementations) / sizeof (implementations[0]);
+    int _seconds, _percent;
+    SDL_PowerState retval;
+    int i;
+
+    /* Make these never NULL for platform-specific implementations. */
+    if (seconds == NULL) {
+        seconds = &_seconds;
+    }
+
+    if (percent == NULL) {
+        percent = &_percent;
+    }
+
+    for (i = 0; i < total; i++) {
+        if (implementations[i](&retval, seconds, percent)) {
+            return retval;
+        }
+    }
+
+    /* nothing was definitive. */
+    *seconds = -1;
+    *percent = -1;
+    return SDL_POWERSTATE_UNKNOWN;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
+

src/power/linux/SDL_syspower.c

@@ -0,0 +1,207 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#ifndef SDL_POWER_DISABLED
+#ifdef SDL_POWER_LINUX
+
+#include <stdio.h>
+#include <unistd.h>
+
+#include "SDL_power.h"
+
+SDL_bool
+SDL_GetPowerInfo_Linux_sys_power(SDL_PowerState *state,
+                                 int *seconds, int *percent)
+{
+    return SDL_FALSE;  /* !!! FIXME: write me. */
+#if 0
+    const int fd = open("/sys/power", O_RDONLY);
+    if (fd == -1) {
+        return SDL_FALSE;  /* can't use this interface. */
+    }
+    return SDL_TRUE;
+#endif
+}
+
+SDL_bool
+SDL_GetPowerInfo_Linux_sys_proc_acpi(SDL_PowerState *state,
+                                     int *seconds, int *percent)
+{
+    return SDL_FALSE;  /* !!! FIXME: write me. */
+#if 0
+    const int fd = open("/proc/acpi", O_RDONLY);
+    if (fd == -1) {
+        return SDL_FALSE;  /* can't use this interface. */
+    }
+    return SDL_TRUE;
+#endif
+}
+
+static SDL_bool
+next_string(char **_ptr, char **_str)
+{
+    char *ptr = *_ptr;
+    char *str = *_str;
+
+    while (*ptr == ' ') {  /* skip any spaces... */
+        ptr++;
+    }
+
+    if (*ptr == '\0') {
+        return SDL_FALSE;
+    }
+
+    str = ptr;
+    while ((*ptr != ' ') && (*ptr != '\0'))
+        ptr++;
+
+    if (*ptr != '\0')
+        *(ptr++) = '\0';
+
+    *_str = str;
+    *_ptr = ptr;
+    return SDL_TRUE;
+}
+
+static SDL_bool
+int_string(char *str, int *val)
+{
+    char *endptr = NULL;
+    *val = (int) strtol(str+2, &endptr, 16);
+    return ((*str != '\0') && (*endptr == '\0'));
+}
+
+/* http://lxr.linux.no/linux+v2.6.29/drivers/char/apm-emulation.c */
+SDL_bool
+SDL_GetPowerInfo_Linux_sys_proc_apm(SDL_PowerState *state,
+                                    int *seconds, int *percent)
+{
+    SDL_bool need_details = SDL_FALSE;
+    int ac_status = 0;
+    int battery_status = 0;
+    int battery_flag = 0;
+    int battery_percent = 0;
+    int battery_time = 0;
+    const int fd = open("/proc/apm", O_RDONLY);
+    char buf[128];
+    char *ptr = &buf[0];
+    char *str = NULL;
+    ssize_t br;
+
+    if (fd == -1) {
+        return SDL_FALSE;  /* can't use this interface. */
+    }
+
+    br = read(fd, buf, sizeof (buf) - 1);
+    close(fd);
+
+    if (br < 0) {
+        return SDL_FALSE;
+    }
+
+    buf[br] = '\0';  // null-terminate the string.
+    if (!next_string(&ptr, &str)) {  /* driver version */
+        return SDL_FALSE;
+    }
+    if (!next_string(&ptr, &str)) {  /* BIOS version */
+        return SDL_FALSE;
+    }
+    if (!next_string(&ptr, &str)) {  /* APM flags */
+        return SDL_FALSE;
+    }
+
+    if (!next_string(&ptr, &str)) {  /* AC line status */
+        return SDL_FALSE;
+    } else if (!int_string(str, &ac_status)) {
+        return SDL_FALSE;
+    }
+
+    if (!next_string(&ptr, &str)) {  /* battery status */
+        return SDL_FALSE;
+    } else if (!int_string(str, &battery_status)) {
+        return SDL_FALSE;
+    }
+    if (!next_string(&ptr, &str)) {  /* battery flag */
+        return SDL_FALSE;
+    } else if (!int_string(str, &battery_flag)) {
+        return SDL_FALSE;
+    }
+    if (!next_string(&ptr, &str)) {  /* remaining battery life percent */
+        return SDL_FALSE;
+    }
+    if (str[strlen(str) - 1] == '%') {
+        str[strlen(str) - 1] = '\0';
+    }
+    if (!int_string(str, &battery_percent)) {
+        return SDL_FALSE;
+    }
+
+    if (!next_string(&ptr, &str)) {  /* remaining battery life time */
+        return SDL_FALSE;
+    } else if (!int_string(str, &battery_time)) {
+        return SDL_FALSE;
+    }
+
+    if (!next_string(&ptr, &str)) {  /* remaining battery life time units */
+        return SDL_FALSE;
+    } else if (strcmp(str, "min") == 0) {
+        battery_time *= 60;
+    }
+
+    if (battery_flag == 0xFF) {  /* unknown state */
+        *state = SDL_POWERSTATE_UNKNOWN;
+    } else if (battery_flag & (1 << 7)) {  /* no battery */
+        *state = SDL_POWERSTATE_NO_BATTERY;
+    } else if (battery_flag & (1 << 3)) {  /* charging */
+        *state = SDL_POWERSTATE_CHARGING;
+        need_details = SDL_TRUE;
+    } else if (ac_status == 1) {
+        *state = SDL_POWERSTATE_CHARGED;  /* on AC, not charging. */
+        need_details = SDL_TRUE;
+    } else {
+        *state = SDL_POWERSTATE_ON_BATTERY;
+        need_details = SDL_TRUE;
+    }
+
+    *percent = -1;
+    *seconds = -1;
+    if (need_details) {
+        const int pct = battery_percent;
+        const int secs = battery_time;
+
+        if (pct >= 0) {  /* -1 == unknown */
+            *percent = (pct > 100) ? 100 : pct;  /* clamp between 0%, 100% */
+        }
+        if (secs >= 0) {  /* -1 == unknown */
+            *seconds = secs;
+        }
+    }
+
+    return SDL_TRUE;
+}
+
+#endif /* SDL_POWER_LINUX */
+#endif /* SDL_POWER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */
+

src/power/macosx/SDL_syspower.c

@@ -0,0 +1,193 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#ifndef SDL_POWER_DISABLED
+#ifdef SDL_POWER_MACOSX
+
+#include <Carbon/Carbon.h>
+#include <IOKit/ps/IOPowerSources.h>
+#include <IOKit/ps/IOPSKeys.h>
+
+#include "SDL_power.h"
+
+/* Carbon is so verbose... */
+#define STRMATCH(a,b) (CFStringCompare(a, b, 0) == kCFCompareEqualTo)
+#define GETVAL(k,v) \
+    CFDictionaryGetValueIfPresent(dict, CFSTR(k), (const void **) v)
+
+/* Note that AC power sources also include a laptop battery it is charging. */
+static void
+checkps(CFDictionaryRef dict, SDL_bool *have_ac, SDL_bool *have_battery,
+        SDL_bool *charging, int *seconds, int *percent)
+{
+    CFStringRef strval;  /* don't CFRelease() this. */
+    CFBooleanRef bval;
+    CFNumberRef numval;
+    SDL_bool charge = SDL_FALSE;
+    SDL_bool choose = SDL_FALSE;
+    SDL_bool is_ac = SDL_FALSE;
+    int secs = -1;
+    int maxpct = -1;
+    int pct = -1;
+
+    if ((GETVAL(kIOPSIsPresentKey, &bval)) && (bval == kCFBooleanFalse)) {
+        return;  /* nothing to see here. */
+    }
+
+    if (!GETVAL(kIOPSPowerSourceStateKey, &strval)) {
+        return;
+    }
+
+    if (STRMATCH(strval, CFSTR(kIOPSACPowerValue))) {
+        is_ac = *have_ac = SDL_TRUE;
+    } else if (!STRMATCH(strval, CFSTR(kIOPSBatteryPowerValue))) {
+        return;  /* not a battery? */
+    }
+
+    if ((GETVAL(kIOPSIsChargingKey, &bval)) && (bval == kCFBooleanTrue)) {
+        charge = SDL_TRUE;
+    }
+
+    if (GETVAL(kIOPSMaxCapacityKey, &numval)) {
+        SInt32 val = -1;
+        CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
+        if (val > 0) {
+            *have_battery = SDL_TRUE;
+            maxpct = (int) val;
+        }
+    }
+
+    if (GETVAL(kIOPSMaxCapacityKey, &numval)) {
+        SInt32 val = -1;
+        CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
+        if (val > 0) {
+            *have_battery = SDL_TRUE;
+            maxpct = (int) val;
+        }
+    }
+
+    if (GETVAL(kIOPSTimeToEmptyKey, &numval)) {
+        SInt32 val = -1;
+        CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
+
+        /* Mac OS X reports 0 minutes until empty if you're plugged in. :( */
+        if ((val == 0) && (is_ac)) {
+            val = -1;  /* !!! FIXME: calc from timeToFull and capacity? */
+        }
+
+        secs = (int) val;
+        if (secs > 0) {
+            secs *= 60;  /* value is in minutes, so convert to seconds. */
+        }
+    }
+
+    if (GETVAL(kIOPSCurrentCapacityKey, &numval)) {
+        SInt32 val = -1;
+        CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
+        pct = (int) val;
+    }
+
+    if ((pct > 0) && (maxpct > 0)) {
+    	pct = (int) ((((double)pct)/((double)maxpct)) * 100.0);
+    }
+
+    if (pct > 100) {
+        pct = 100;
+    }
+
+    /*
+     * We pick the battery that claims to have the most minutes left.
+     *  (failing a report of minutes, we'll take the highest percent.)
+     */
+    if ((secs < 0) && (*seconds < 0)) {
+        if ((pct < 0) && (*percent < 0)) {
+            choose = SDL_TRUE; /* at least we know there's a battery. */
+        }
+        if (pct > *percent) {
+            choose = SDL_TRUE;
+        }
+    } else if (secs > *seconds) {
+        choose = SDL_TRUE;
+    }
+
+    if (choose) {
+        *seconds = secs;
+        *percent = pct;
+        *charging = charge;
+    }
+}
+
+#undef GETVAL
+#undef STRMATCH
+
+
+SDL_bool
+SDL_GetPowerInfo_MacOSX(SDL_PowerState *state, int *seconds, int *percent)
+{
+    CFTypeRef blob = IOPSCopyPowerSourcesInfo();
+
+    *seconds = -1;
+    *percent = -1;
+    *state = SDL_POWERSTATE_UNKNOWN;
+
+    if (blob != NULL) {
+        CFArrayRef list = IOPSCopyPowerSourcesList(blob);
+        if (list != NULL) {
+            /* don't CFRelease() the list items, or dictionaries! */
+            SDL_bool have_ac = SDL_FALSE;
+            SDL_bool have_battery = SDL_FALSE;
+            SDL_bool charging = SDL_FALSE;
+            const CFIndex total = CFArrayGetCount(list);
+            CFIndex i;
+            for (i = 0; i < total; i++) {
+                CFTypeRef ps = (CFTypeRef) CFArrayGetValueAtIndex(list, i);
+                CFDictionaryRef dict = IOPSGetPowerSourceDescription(blob, ps);
+                if (dict != NULL) {
+                    checkps(dict, &have_ac, &have_battery, &charging,
+                            seconds, percent);
+                }
+            }
+
+            if (!have_battery) {
+                *state = SDL_POWERSTATE_NO_BATTERY;
+            } else if (charging) {
+                *state = SDL_POWERSTATE_CHARGING;
+            } else if (have_ac) {
+                *state = SDL_POWERSTATE_CHARGED;
+            } else {
+                *state = SDL_POWERSTATE_ON_BATTERY;
+            }
+
+            CFRelease(list);
+        }
+        CFRelease(blob);
+    }
+
+    return SDL_TRUE;  /* always the definitive answer on Mac OS X. */
+}
+
+#endif /* SDL_POWER_MACOSX */
+#endif /* SDL_POWER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */
+

src/power/nds/SDL_syspower.c

@@ -0,0 +1,45 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#ifndef SDL_POWER_DISABLED
+#ifdef SDL_POWER_NINTENDODS
+
+#include "SDL_power.h"
+
+SDL_bool
+SDL_GetPowerInfo_NintendoDS(SDL_PowerState *state, int *seconds, int *percent)
+{
+    /* !!! FIXME: write me. */
+
+    *state = SDL_POWERSTATE_UNKNOWN;
+    *percent = -1;
+    *seconds = -1;
+
+    return SDL_TRUE;  /* always the definitive answer on Nintendo DS. */
+}
+
+#endif /* SDL_POWER_NINTENDODS */
+#endif /* SDL_POWER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */
+

src/power/os2/SDL_syspower.c

@@ -0,0 +1,135 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* !!! FIXME:
+ * Please note that this code has not been tested (or even compiled!). It
+ *  should, in theory, run on any version of OS/2, and work with any system
+ *  that has APM.SYS loaded. I don't know if ACPI.SYS works.
+ */
+
+#ifndef SDL_POWER_DISABLED
+#ifdef SDL_POWER_OS2
+
+#define INCL_DOSFILEMGR
+#define INCL_DOSDEVICES
+#define INCL_DOSDEVIOCTL
+#define INCL_DOSERRORS
+#include <os2.h>
+
+#include "SDL_power.h"
+
+typedef struct {
+    USHORT len;
+    USHORT flags;
+    UCHAR ac_status;
+    UCHAR battery_status;
+    UCHAR battery_life;
+    UCHAR battery_time_form;
+    USHORT battery_time;
+    UCHAR battery_flags;
+} PowerStatus;
+extern int CompilerAssertPowerStatus[(sizeof (PowerStatus) == 10) ? 1 : -1];
+
+
+SDL_bool
+SDL_GetPowerInfo_OS2(SDL_PowerState *state, int *seconds, int *percent)
+{
+    PowerStatus status;
+    HFILE hfile = 0;
+    ULONG action = 0;
+    APIRET rc = 0;
+
+    *state = SDL_POWERSTATE_UNKNOWN;
+    *percent = -1;
+    *seconds = -1;
+
+    /* open the power management device */
+    rc = DosOpen("APM$", &hfile, &action, 0, FILE_NORMAL, FILE_OPEN,
+                 OPEN_ACCESS_READONLY | OPEN_SHARE_DENYNONE, 0);
+
+    if (rc == NO_ERROR) {
+        USHORT iorc = 0;
+        ULONG iorclen = sizeof (iorc);
+        ULONG statuslen = sizeof (status);
+
+        SDL_memset(&status, '\0', sizeof (status));
+        status.len = sizeof (status);
+
+        rc = DosDevIOCtl(hfile, IOCTL_POWER, POWER_GETPOWERSTATUS, &status,
+                         statuslen, &statuslen, &iorc, iorclen, &iorclen);
+        DosClose(hfile);
+
+        /* (status.flags & 0x1) == power subsystem enabled. */
+        if ((rc == NO_ERROR) && (status.flags & 0x1)) {
+            if (statuslen == 7) {  /* older OS/2 APM driver? Less fields. */
+                status.battery_time_form = 0xFF;
+                status.battery_time = 0;
+                if (status.battery_status == 0xFF) {
+                    status.battery_flags = 0xFF;
+                } else {
+                    status.battery_flags = (1 << status.battery_status);
+                }
+            }
+
+            if (status.battery_flags == 0xFF) {  /* unknown state */
+                *state = SDL_POWERSTATE_UNKNOWN;
+            } else if (status.battery_flags & (1 << 7)) {  /* no battery */
+                *state = SDL_POWERSTATE_NO_BATTERY;
+            } else if (status.battery_flags & (1 << 3)) {  /* charging */
+                *state = SDL_POWERSTATE_CHARGING;
+                need_details = SDL_TRUE;
+            } else if (status.ac_status == 1) {
+                *state = SDL_POWERSTATE_CHARGED;  /* on AC, not charging. */
+                need_details = SDL_TRUE;
+            } else {
+                *state = SDL_POWERSTATE_ON_BATTERY;  /* not on AC. */
+                need_details = SDL_TRUE;
+            }
+
+            if (need_details) {
+                const int pct = (int) status.battery_life;
+                const int secs = (int) status.battery_time;
+
+                if (pct != 0xFF) {  /* 255 == unknown */
+                    *percent = (pct > 100) ? 100 : pct;
+                }
+
+                if (status.battery_time_form == 0xFF) {  /* unknown */
+                    *seconds = -1;
+                } else if (status.battery_time_form == 1) {  /* minutes */
+                    *seconds = secs * 60;
+                } else {
+                    *seconds = secs;
+                }
+            }
+        }
+    }
+
+    return SDL_TRUE;  /* always the definitive answer on OS/2. */
+}
+
+#endif /* SDL_POWER_OS2 */
+#endif /* SDL_POWER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */
+

src/power/windows/SDL_syspower.c

@@ -0,0 +1,78 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#ifndef SDL_POWER_DISABLED
+#ifdef SDL_POWER_WINDOWS
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include "SDL_power.h"
+
+SDL_bool
+SDL_GetPowerInfo_Windows(SDL_PowerState *state, int *seconds, int *percent)
+{
+    SYSTEM_POWER_STATUS status;
+    SDL_bool need_details = SDL_FALSE;
+
+    /* This API should exist back to Win95 and Windows CE. */
+    if (!GetSystemPowerStatus(&status)) {
+        /* !!! FIXME: push GetLastError() into SDL_GetError() */
+        *state = SDL_POWERSTATE_UNKNOWN;
+    } else if (status.BatteryFlag == 0xFF) {  /* unknown state */
+        *state = SDL_POWERSTATE_UNKNOWN;
+    } else if (status.BatteryFlag & (1 << 7)) {  /* no battery */
+        *state = SDL_POWERSTATE_NO_BATTERY;
+    } else if (status.BatteryFlag & (1 << 3)) {  /* charging */
+        *state = SDL_POWERSTATE_CHARGING;
+        need_details = SDL_TRUE;
+    } else if (status.ACLineStatus == 1) {
+        *state = SDL_POWERSTATE_CHARGED;  /* on AC, not charging. */
+        need_details = SDL_TRUE;
+    } else {
+        *state = SDL_POWERSTATE_ON_BATTERY;  /* not on AC. */
+        need_details = SDL_TRUE;
+    }
+
+    *percent = -1;
+    *seconds = -1;
+    if (need_details) {
+        const int pct = (int) status.BatteryLifePercent;
+        const int secs = (int) status.BatteryLifeTime;
+
+        if (pct != 255) {  /* 255 == unknown */
+            *percent = (pct > 100) ? 100 : pct;  /* clamp between 0%, 100% */
+        }
+        if (secs != 0xFFFFFFFF) {  /* ((DWORD)-1) == unknown */
+            *seconds = secs;
+        }
+    }
+
+    return SDL_TRUE;  /* always the definitive answer on Windows. */
+}
+
+#endif /* SDL_POWER_WINDOWS */
+#endif /* SDL_POWER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */
+