reflow-oven-control-sw/stm-firmware/updater/ram-code/itoa.c

88 lines
1.9 KiB
C

#include "itoa.h"
/*
* The heapless_itoa function is copied from the shellmatta project.
*/
/**
* @brief itoa like function to convert int to an ascii string
* @warning you have to provide a large enough buffer
* @param[in] value
* @param[in,out] buffer
* @param[in] base
* @return number of bytes in string
*/
uint32_t heapless_itoa(int32_t value, char *buffer, uint32_t base)
{
char tempBuffer[34u];
uint32_t i;
uint32_t bufferIdx = 0u;
int8_t digitValue;
/** -# check the base for plausibility */
if((base >= 2) && (base <= 16))
{
/** -# check for sign */
if(value < 0)
{
value = value * (-1);
buffer[0u] = '-';
bufferIdx += 1u;
}
/** -# loop through all digits in reverse order */
i = 0u;
do
{
digitValue = (int8_t) (value % base);
tempBuffer[i] = (digitValue < 10) ? ('0' + digitValue) : ('A' + (digitValue - 10));
value /= base;
i ++;
}while(value > 0);
/** -# store the string in the correct order onto the buffer */
while(i > 0u)
{
buffer[bufferIdx] = tempBuffer[i - 1u];
i --;
bufferIdx ++;
}
}
return bufferIdx;
}
static char num_to_hex_digit(uint8_t num, bool capitalized)
{
char ret = 'U';
switch (num) {
case 0 ... 9:
ret = '0' + num;
break;
case 0xA ... 0xF:
if (capitalized)
ret = 'A' + num - 0xA;
else
ret = 'a' + num - 0xA;
break;
default:
break;
}
return ret;
}
uint32_t bytes_to_hex_string(uint8_t *input, uint32_t count, char *output_buffer, bool capitalized)
{
uint32_t idx;
uint8_t b;
for (idx = 0; idx < count; idx++) {
b = input[idx];
output_buffer[idx] = num_to_hex_digit(b >> 4, capitalized);
output_buffer[idx+1] = num_to_hex_digit(b & 0xF, capitalized);
}
return 0;
}