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Compliant Solution (POSIX)
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The following compliant solution depends on the POSIX {{strdup()}} function to make a copy of the environment variable string. The {{strdup()}} function is also included in ISO/IEC PDTR 24731-2 \[[ISO/IEC PDTR 24731-2|AA. C References#ISO/IEC ISO/IEC PDTR 24731-2]\]. |
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char *tmpvar;
char *tempvar;
char *temp;
if ((temp = getenv("TMP"));
if (temp != NULL) {
tmpvar = strdup(temp);
if (tmpvar == NULL) {
/* handle error condition */
}
}
else {
return -1;
}
if ((temp = getenv("TEMP"));
if (temp != NULL) {
tempvar = strdup(temp);
if (tempvar == NULL) {
free(tmpvar);
tmpvar = NULL;
/* handle error condition */
}
}
else {
free(tmpvar);
tmpvar = NULL;
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");
}
free(tmpvar);
tmpvar = NULL;
free(tempvar);
tempvar = NULL;
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Compliant Solution
This compliant solution is fully portable.
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char *tmpvar;
char *tempvar;
char *temp;
if ((temp = getenv("TMP"));
if (temp != NULL) {
tmpvar = (char *)malloc(strlen(temp)+1);
if (tmpvar != NULL) {
strcpy(tmpvar, temp);
}
else {
/* handle error condition */
}
}
else {
return -1;
}
if ((temp = getenv("TEMP"));
if (temp != NULL) {
tempvar = (char *)malloc(strlen(temp)+1);
if (tempvar != NULL) {
strcpy(tempvar, temp);
}
else {
free(tmpvar);
tmpvar = NULL;
/* handle error condition */
}
}
else {
free(tmpvar);
tmpvar = NULL;
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");
}
free(tmpvar);
tmpvar = NULL;
free(tempvar);
tempvar = NULL;
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