c - scanning a 128 bit input represented in 32 hex values -

i need scan 32 hex number command line , populated uint8_t [16] array, tried scanning string , convert hex hassle since cant find function that, whats best way this?

uint8_t get_int(char c) {   if (c >= '0' && c <= '9') return      c - '0';   if (c >= 'a' && c <= 'f') return 10 + c - 'a';   if (c >= 'a' && c <= 'f') return 10 + c - 'a';   return -1; }  int main(void) {     char buff[33];     size_t size;     size_t i;     uint8_t *output;      fgets(buff, sizeof buff, stdin);     size = strlen(buff) / 2;     output = malloc(size);      (i= 0; < size; ++i)       output[i] = get_int(buff[2*i]) * 16 + get_int(buff[2*i+1]);      (i= 0; < size; ++i)         printf("%u ", output[i]);      return 0; } 

ideone link