PrintUnicode.c

// PrintUnicode.c - input ascii utf8 hex value and prints the corresponding unicode
// character.

// example - try the following!
//   echo -n '0xf09f9886' | xargs ./PrintUnicode
//   Or
//   ./PrintUnicode f09f9886

#include <stdio.h>              // sscanf, printf
#include <stdint.h>             // uint32_t, uint8_t

// print RAW byte sequence.
void printRawBytes (uint8_t* rawBytes, size_t len)
{
    // Print backwards since x86 stores data in little-endian.
    for (size_t i = 0, end = len - 1; i < len; ++i) {
        printf ("%c", rawBytes[end - i]);
    }
}

void main (int argc, char* argv[])
{
    uint32_t hex;

    sscanf (argv[1], "%x", &hex);

    printRawBytes ((uint8_t*)&hex, sizeof(hex));

}