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char *tmpvar;
char *tempvar;
size_t requiredSize;

getenv_s(&requiredSize, NULL, 0, "TMP");
tmpvar= (char *)malloc(requiredSize * sizeof(char));
if (!tmpvar) {
   /* handle error condition */
}
getenv_s(&requiredSize, tmpvar, requiredSize, "TMP" );

getenv_s(&requiredSize, NULL, 0, "TEMP");
tempvar= (char *)malloc(requiredSize * sizeof(char));
if (!tempvar) {
   /* handle error condition */
}
getenv_s(&requiredSize, tempvar, requiredSize, "TEMP" );

if (strcmp(tmpvar, tempvar) == 0) {
  puts("TMP and TEMP are the same.\n");
}
else {
  puts("TMP and TEMP are NOT the same.\n");
}

char *tmpvar;
char *tempvar;
char *temp;

if ( (temp = getenv("TMP")) != NULL) {
  tmpvar= (char *)malloc(strlen(temp)+1);
  if (tmpvar != NULL) {
    strcpy(tmpvar, temp);
  }
  else {
    /* handle error condition */
  }
}
else {
  return -1;
}

if ( (temp = getenv("TEMP")) != NULL) {
  tempvar= (char *)malloc(strlen(temp)+1);
  if (tempvar != NULL) {
    strcpy(tempvar, temp);
  }
  else {
    /* handle error condition */
  }
}
else {
  return -1;
}

if (strcmp(tmpvar, tempvar) == 0) {
  puts("TMP and TEMP are the same.\n");
}
else {
  puts("TMP and TEMP are NOT the same.\n");
}