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#include "TxtDataHelpers.h"
void StrHelper::strncpy(char* dest, const char* src, size_t buf_sz) {
while (buf_sz > 1 && *src) {
*dest++ = *src++;
buf_sz--;
}
*dest = 0; // truncates if needed
}
void StrHelper::strzcpy(char* dest, const char* src, size_t buf_sz) {
while (buf_sz > 1 && *src) {
*dest++ = *src++;
buf_sz--;
}
while (buf_sz > 0) { // pad remaining with nulls
*dest++ = 0;
buf_sz--;
}
}
bool StrHelper::isBlank(const char* str) {
while (*str) {
if (*str++ != ' ') return false;
}
return true;
}
#include <Arduino.h>
union int32_Float_t
{
int32_t Long;
float Float;
};
#ifndef FLT_MIN_EXP
#define FLT_MIN_EXP (-999)
#endif
#ifndef FLT_MAX_EXP
#define FLT_MAX_EXP (999)
#endif
#define _FTOA_TOO_LARGE -2 // |input| > 2147483520
#define _FTOA_TOO_SMALL -1 // |input| < 0.0000001
//precision 0-9
#define PRECISION 7
//_ftoa function
static void _ftoa(float f, char *p, int *status)
{
int32_t mantissa, int_part, frac_part;
int16_t exp2;
int32_Float_t x;
*status = 0;
if (f == 0.0)
{
*p++ = '0';
*p++ = '.';
*p++ = '0';
*p = 0;
return;
}
x.Float = f;
exp2 = (unsigned char)(x.Long>>23) - 127;
mantissa = (x.Long&0xFFFFFF) | 0x800000;
frac_part = 0;
int_part = 0;
if (exp2 >= 31)
{
*status = _FTOA_TOO_LARGE;
return;
}
else if (exp2 < -23)
{
*status = _FTOA_TOO_SMALL;
return;
}
else if (exp2 >= 23)
{
int_part = mantissa<<(exp2 - 23);
}
else if (exp2 >= 0)
{
int_part = mantissa>>(23 - exp2);
frac_part = (mantissa<<(exp2 + 1))&0xFFFFFF;
}
else
{
//if (exp2 < 0)
frac_part = (mantissa&0xFFFFFF)>>-(exp2 + 1);
}
if (x.Long < 0)
*p++ = '-';
if (int_part == 0)
*p++ = '0';
else
{
ltoa(int_part, p, 10);
while (*p)
p++;
}
*p++ = '.';
if (frac_part == 0)
*p++ = '0';
else
{
char m;
for (m=0; m<PRECISION; m++)
{
//frac_part *= 10;
frac_part = (frac_part<<3) + (frac_part<<1);
*p++ = (frac_part>>24) + '0';
frac_part &= 0xFFFFFF;
}
//delete ending zeroes
for (--p; p[0] == '0' && p[-1] != '.'; --p)
;
++p;
}
*p = 0;
}
const char* StrHelper::ftoa(float f) {
static char tmp[16];
int status;
_ftoa(f, tmp, &status);
if (status) {
tmp[0] = '0'; // fallback/error value
tmp[1] = 0;
}
return tmp;
}
const char* StrHelper::ftoa3(float f) {
static char s[16];
int v = (int)(f * 1000.0f + (f >= 0 ? 0.5f : -0.5f)); // rounded ×1000
int w = v / 1000; // whole
int d = abs(v % 1000); // decimals
snprintf(s, sizeof(s), "%d.%03d", w, d);
for (int i = strlen(s) - 1; i > 0 && s[i] == '0'; i--)
s[i] = 0;
int L = strlen(s);
if (s[L - 1] == '.') s[L - 1] = 0;
return s;
}
uint32_t StrHelper::fromHex(const char* src) {
uint32_t n = 0;
while (*src) {
if (*src >= '0' && *src <= '9') {
n <<= 4;
n |= (*src - '0');
} else if (*src >= 'A' && *src <= 'F') {
n <<= 4;
n |= (*src - 'A' + 10);
} else if (*src >= 'a' && *src <= 'f') {
n <<= 4;
n |= (*src - 'a' + 10);
} else {
break; // non-hex char encountered, stop parsing
}
src++;
}
return n;
}
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