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| Code Block |
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#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
void func(void) {
char *tmpvar;
char *tempvar;
size_t len;
errno_t err = _dupenv_s(&tmpvar, &len, "TMP");
if (err) {
/* Handle error */
}
err = _dupenv_s(&tempvar, &len, "TEMP");
if (err) {
/* Handle error */
}
if (strcmp(tmpvar, tempvar) == 0) {
printf("TMP and TEMP are the same.\n");
} else {
printf("TMP and TEMP are NOT the same.\n");
}
free(tmpvar);
tmpvar = NULL;
free(tempvar);
tempvar = NULL;
}
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Compliant Solution (POSIX or C2x)
POSIX provides the strdup() function, which can make a copy of the environment variable string [IEEE Std 1003.1:2013]. The strdup() function is also included in Extensions to the C Library—Part II [ISO/IEC TR 24731-2:2010]. Further, it is expected to be present in the C2x standard.
| Code Block |
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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
void func(void) {
char *tmpvar;
char *tempvar;
const char *temp = getenv("TMP");
if (temp != NULL) {
tmpvar = strdup(temp);
if (tmpvar == NULL) {
/* Handle error */
}
} else {
/* Handle error */
}
temp = getenv("TEMP");
if (temp != NULL) {
tempvar = strdup(temp);
if (tempvar == NULL) {
/* Handle error */
}
} else {
/* Handle error */
}
if (strcmp(tmpvar, tempvar) == 0) {
printf("TMP and TEMP are the same.\n");
} else {
printf("TMP and TEMP are NOT the same.\n");
}
free(tmpvar);
tmpvar = NULL;
free(tempvar);
tempvar = NULL;
}
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