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/**
** @file cvthex.c
**
** @author Numerous CSCI-452 classes
**
** @brief C implementations of common library functions
*/
#ifndef CVTHEX_SRC_INC
#define CVTHEX_SRC_INC
#include <common.h>
#include <lib.h>
/**
** cvthex(buf,value)
**
** convert a 32-bit unsigned value into a minimal-length (up to
** 8-character) NUL-terminated character string
**
** @param buf Destination buffer
** @param value Value to convert
**
** @return The number of characters placed into the buffer
** (not including the NUL)
**
** NOTE: assumes buf is large enough to hold the resulting string
*/
int cvthex(char *buf, uint32_t value)
{
const char hexdigits[] = "0123456789ABCDEF";
int chars_stored = 0;
for (int i = 0; i < 8; i += 1) {
uint32_t val = value & 0xf0000000;
if (chars_stored || val != 0 || i == 7) {
++chars_stored;
val = (val >> 28) & 0xf;
*buf++ = hexdigits[val];
}
value <<= 4;
}
*buf = '\0';
return (chars_stored);
}
#endif
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