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SDL_syspower.c
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/*
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>
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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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#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
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SDL_GetPowerInfo_Linux_proc_acpi(SDL_PowerState *state,
int *seconds, int *percent)
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{
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
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SDL_GetPowerInfo_Linux_proc_apm(SDL_PowerState *state,
int *seconds, int *percent)
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{
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: */