54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
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#include "itoa.h"
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/*
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* The heapless_itoa function is copied from the shellmatta project.
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*/
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/**
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* @brief itoa like function to convert int to an ascii string
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* @warning you have to provide a large enough buffer
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* @param[in] value
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* @param[in,out] buffer
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* @param[in] base
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* @return number of bytes in string
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*/
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uint32_t heapless_itoa(int32_t value, char *buffer, uint32_t base)
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{
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char tempBuffer[34u];
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uint32_t i;
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uint32_t bufferIdx = 0u;
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int8_t digitValue;
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/** -# check the base for plausibility */
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if((base >= 2) && (base <= 16))
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{
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/** -# check for sign */
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if(value < 0)
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{
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value = value * (-1);
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buffer[0u] = '-';
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bufferIdx += 1u;
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}
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/** -# loop through all digits in reverse order */
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i = 0u;
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do
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{
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digitValue = (int8_t) (value % base);
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tempBuffer[i] = (digitValue < 10) ? ('0' + digitValue) : ('A' + (digitValue - 10));
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value /= base;
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i ++;
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}while(value > 0);
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/** -# store the string in the correct order onto the buffer */
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while(i > 0u)
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{
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buffer[bufferIdx] = tempBuffer[i - 1u];
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i --;
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bufferIdx ++;
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}
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}
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return bufferIdx;
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}
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