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char *tmpvar;
char *tempvar;
size_t len;

errno_t err = _dupenv_s(&tmpvar, &len, "TMP");
if (err) return -1;
errno_t err = _dupenv_s(&tempvar, &len, "TEMP");
if (err) {
  free(tmpvar);
  tmpvar = NULL;
  return -1;
}

if (strcmp(tmpvar, tempvar) == 0) {
  if (puts("TMP and TEMP are the same.\n") == EOF) {
    /* Handle error */
  }
}
else {
  if (puts("TMP and TEMP are NOT the same.\n") == EOF) {
    /* Handle error */
  }
}
free(tmpvar);
tmpvar = NULL;
free(tempvar);
tempvar = NULL;