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/*
* GraphLCD graphics library
*
* common.c - various functions
*
* 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>
* (c) 2010-2012 Wolfgang Astleitner <mrwastl AT users sourceforge net>
*/
#include <ctype.h>
#include <syslog.h>
#include "common.h"
namespace GLCD
{
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 > start)
{
if (!isspace(s[end]))
break;
end--;
}
return s.substr(start, end - start + 1);
}
bool encodedCharAdjustCounter(const bool isutf8, const std::string & str, uint32_t & c, unsigned int & i, const uint32_t errChar)
{
bool rv = false;
if (i >= str.length())
return rv;
if ( isutf8 ) {
uint8_t c0,c1,c2,c3;
c = str[i];
c0 = str[i];
c1 = (i+1 < str.length()) ? str[i+1] : 0;
c2 = (i+2 < str.length()) ? str[i+2] : 0;
c3 = (i+3 < str.length()) ? str[i+3] : 0;
if ( (c0 & 0x80) == 0x00) {
// one byte: 0xxxxxxx
c = c0;
rv = true;
} else if ( (c0 & 0xE0) == 0xC0 ) {
// two byte utf8: 110yyyyy 10xxxxxx -> 00000yyy yyxxxxxx
if ( (c1 & 0xC0) == 0x80 ) {
c = ( (c0 & 0x1F) << 6 ) | ( (c1 & 0x3F) );
rv = true;
} else {
//syslog(LOG_INFO, "GraphLCD: illegal 2-byte UTF-8 sequence found: %02x %02x, pos=%d, str: %s\n", c0,c1,i,str.c_str());
c = errChar;
}
i += 1;
} else if ( (c0 & 0xF0) == 0xE0 ) {
// three byte utf8: 1110zzzz 10yyyyyy 10xxxxxx -> zzzzyyyy yyxxxxxx
if ( ((c1 & 0xC0) == 0x80) && ((c2 & 0xC0) == 0x80) ) {
c = ( (c0 & 0x0F) << 12 ) | ( (c1 & 0x3F) << 6 ) | ( c2 & 0x3F );
rv = true;
} else {
//syslog(LOG_INFO, "GraphLCD: illegal 3-byte UTF-8 sequence found: %02x %02x %02x, pos=%d, str: %s\n", c0,c1,c2,i,str.c_str());
c = errChar;
}
i += 2;
} else if ( (c0 & 0xF8) == 0xF0 ) {
// four byte utf8: 11110www 10zzzzzz 10yyyyyy 10xxxxxx -> 000wwwzz zzzzyyyy yyxxxxxx
if ( ((c1 & 0xC0) == 0x80) && ((c2 & 0xC0) == 0x80) && ((c3 & 0xC0) == 0x80) ) {
c = ( (c0 & 0x07) << 18 ) | ( (c1 & 0x3F) << 12 ) | ( (c2 & 0x3F) << 6 ) | (c3 & 0x3F);
rv = true;
} else {
//syslog(LOG_INFO, "GraphLCD: illegal 4-byte UTF-8 sequence found: %02x %02x %02x %02x, pos=%d, str: %s\n", c0,c1,c2,c3,i,str.c_str());
c = errChar;
}
i += 3;
} else {
// 1xxxxxxx is invalid!
//syslog(LOG_INFO, "GraphLCD: illegal 1-byte UTF-8 char found: %02x, pos=%d, str: %s\n", c0,i,str.c_str());
c = errChar;
}
} else {
c = str[i];
rv = true;
}
return rv;
}
} // end of namespace
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