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LineReceiver.cpp
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LineReceiver.cpp
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#include "LineReceiver.h"
// define some macros for use in flags
#define OVERFLOWED 1
#define PUSHTRUEOVERFLOW 2
#define PUSHTRUESPECIAL 4
#define CALLBACKSPECIAL 8
#define OVERFLOWSPECIAL 16
void LineReceiver::init(size_t n, callback_t callback)
{
p_=buf_ = (char*)malloc(n);
size_ = n;
callback_ = callback;
*p_=0;
}
bool LineReceiver::push(char c)
{
*p_++=c;
*p_=0;
if(c=='\n') {
if(callback_!=nullptr) callback_(buf_);
p_=buf_;
return true;
} else if((c<' ')&&(flags&(CALLBACKSPECIAL|OVERFLOWSPECIAL|PUSHTRUESPECIAL))) {
if(flags&CALLBACKSPECIAL) callback_(buf_);
if(flags&OVERFLOWSPECIAL) eventOverflow_(buf_);
if(flags&PUSHTRUESPECIAL) return true;
}
if(p_==&buf_[size_-1]) {
flags|=OVERFLOWED; // set overflow flag for the handler (if any)
if(eventOverflow_!=nullptr) {
eventOverflow_(buf_);
flags&=~OVERFLOWED; // only reset because they have a handler
}
p_=buf_;
if(flags&PUSHTRUEOVERFLOW) return true;
}
return false;
}
bool LineReceiver::overflowed()
{
if(!flags&OVERFLOWED) return false;
flags&=~OVERFLOWED; // clear the flag.
return true;
}
void LineReceiver::clear()
{
p_=buf_;
*p_=0;
flags&=~OVERFLOWED;
}
/**********************************************************************************/
float strHex(const char* buf, unsigned char* ptr)
{
unsigned char go=1;
unsigned char breaker=0;
float tmp=0;
uint8_t tmp1=0;
while((*buf<48)&&(*buf!=0))
{
buf++;
*ptr+=1;
}
if((*buf=='0')&&(*(buf+1)=='x'))
{
buf+=2;
*ptr+=2;
}
if(*buf==0) return 0;
while(go!=0&&(++breaker)) {
tmp1=(uint8_t)*buf;
if((tmp1>64)&&(tmp1<71)) tmp1-=7;
if((tmp1>96)&&(tmp1<103)) tmp1-=39;
if((tmp1>47)&&(tmp1<64)) {
tmp=(tmp*16)+tmp1-48;
buf++;
*ptr+=1;
} else {
go=0;
}
}
return tmp;
}
float lineParse(const char* buf, unsigned char* ptr)
{
unsigned char go=1;
unsigned char breaker=0;
float tmp=0;
float frac=0;
float sign1=1;
while(go!=0&&(++breaker)) {
if(*buf!=0) {
if((*buf<33)||(*buf=='=')||(*buf==',')||(*buf==';')||(*buf==':')) {
buf++;
*ptr+=1;
} else {
go=0;
}
} else {
go=0;
}
}
if(((*buf==0)||(*buf<48)||(*buf>57))&&(*buf!='-')) {
return 0;
}
if(*buf=='-')
{
sign1=-1;
buf++;
*ptr+=1;
}
if((*buf=='0')&&(*(buf+1)=='x')) {
return sign1*strHex(buf,ptr);
}
go=1;
while(go!=0&&(++breaker)) {
if((*buf>47)&&(*buf<58)) {
if(frac)
{
tmp=tmp+(((*buf)-48)/frac);
frac*=10;
} else {
tmp=(tmp*10)+((*buf)-48);
}
buf++;
*ptr+=1;
} else if(*buf=='.') {
if(frac) return sign1*tmp; // second decimal point in a number is bullshit.
frac=10;
buf++;
*ptr+=1;
} else {
go=0;
}
}
return sign1*tmp;
}
unsigned char lineParse(const char* buf1, unsigned char* ptr, const char* cPtr)
{
const char * sPtr;
const char * tPtr;
unsigned char count=0,cnt2,go=1;
while(go)
{
count++;
sPtr=cPtr;
while(*cPtr!=0) {
cPtr++;
}
cPtr++;
tPtr=buf1;
cnt2=0;
while((*sPtr==*tPtr)&&(*tPtr!=0))
{
cnt2++;
sPtr++;
tPtr++;
}
if(*sPtr==0)
{
*ptr+=cnt2;
return count;
}
go=*cPtr;
}
return 0;
}