bin_to_strhex.c

void bin_to_strhex(unsigned char *bin, uint32_t size)
{
    char hex_str[]= "0123456789ABCDEF";
    unsigned int  i;
    char *result;

    result = (char *)malloc(size * 2 + 1);
    (result)[size * 2] = 0;

    if (!size)
        return;

    for (i = 0; i < size; i++) {
        (result)[i * 2 + 0] = hex_str[(bin[i] >> 4) & 0x0F];
        (result)[i * 2 + 1] = hex_str[(bin[i]     ) & 0x0F];
    }

    //printf("result : %s\n", result);

    for (int i=0, cnt=0; i < size * 2 + 1; i++) {
        printf("%c", *(result + i));
        if (++cnt == 8) {
            cnt = 0;
            printf(" ");
        }
    }
    printf("\n");

    free(result);
}

// demo code
unsigned char* bindata = (unsigned char *)(sendTask->pData + sendTask->uSentSize);
uint32_t binsz = sendTask->uDataSize - sendTask->uSentSize;
bin_to_strhex(bindata, binsz);