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/*
* GraphLCD driver library
*
* common.c - various functions
*
* parts were taken from graphlcd plugin for the Video Disc Recorder
* (c) 2001-2004 Carsten Siebholz <c.siebholz AT t-online.de>
*
* This file is released under the GNU General Public License. Refer
* to the COPYING file distributed with this package.
*
* (c) 2004 Andreas Regel <andreas.regel AT powarman.de>
*/
#include <ctype.h>
#include <sched.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "common.h"
#include "config.h"
namespace GLCD
{
static const int BitReverseTable[256] =
{
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
int nSleepInit()
{
int ret = 0;
if (Config.waitPriority != 0)
{
ret = setpriority(PRIO_PROCESS, 0, Config.waitPriority);
}
if (!ret)
{
switch (Config.waitMethod)
{
case kWaitUsleep: // usleep
break;
case kWaitNanosleep: // nanosleep
break;
case kWaitNanosleepRR: // nanosleep (sched_rr)
// set sched algorithm
struct sched_param param;
param.sched_priority=1;
ret = sched_setscheduler(0, SCHED_RR, ¶m);
break;
case kWaitGettimeofday: // gettimeofday
break;
}
}
return ret;
}
int nSleepDeInit()
{
int ret = 0;
if (Config.waitPriority != 0)
{
ret = setpriority(PRIO_PROCESS, 0, 0);
}
if (!ret)
{
switch (Config.waitMethod)
{
case kWaitUsleep: // usleep
break;
case kWaitNanosleep: // nanosleep
break;
case kWaitNanosleepRR: // nanosleep (sched_rr)
// set sched algorithm
struct sched_param param;
param.sched_priority=0;
ret = sched_setscheduler(0, SCHED_OTHER, ¶m);
break;
case kWaitGettimeofday: // gettimeofday
break;
}
}
return ret;
}
void nSleep(long ns)
{
switch (Config.waitMethod)
{
case kWaitUsleep: // usleep
if (ns > 0)
{
usleep(std::max(1L, ns/1000));
}
break;
case kWaitNanosleep: // nanosleep
case kWaitNanosleepRR: // nanosleep(sched_rr)
struct timespec delay, remaining;
if (ns > 0)
{
delay.tv_sec = ns/1000000000;
delay.tv_nsec = ns%1000000000;
while (nanosleep(&delay, &remaining) == -1)
{
delay.tv_sec = remaining.tv_sec;
delay.tv_nsec = remaining.tv_nsec;
}
}
break;
case kWaitGettimeofday: //getTimeofday for Kernel 2.6
long us;
struct timeval tv1, tv2;
suseconds_t us2;
if (ns > 0)
{
us = ns / 1000;
if (us == 0)
us = 1;
gettimeofday(&tv1, 0);
do
{
gettimeofday(&tv2, 0);
us2 = tv2.tv_usec + ((tv2.tv_sec - tv1.tv_sec) * 1000000);
} while (us2 - tv1.tv_usec < us);
}
}
}
void uSleep(long us)
{
if (Config.waitMethod == kWaitUsleep)
{
// usleep
if (us > 0)
usleep(std::max(1L, us));
}
else
{
nSleep(us * 1000);
}
}
unsigned char ReverseBits(unsigned char value)
{
return BitReverseTable[value];
}
void clip(int & value, int min, int max)
{
if (value < min)
value = min;
if (value > max)
value = max;
}
void sort(int & value1, int & value2)
{
if (value2 < value1)
{
int tmp;
tmp = value2;
value2 = value1;
value1 = tmp;
}
}
std::string trim(const std::string & s)
{
std::string::size_type start, end;
start = 0;
while (start < s.length())
{
if (!isspace(s[start]))
break;
start++;
}
end = s.length() - 1;
while (end >= 0)
{
if (!isspace(s[end]))
break;
end--;
}
return s.substr(start, end - start + 1);
}
} // end of namespace
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