SEI CERT C Coding Standard

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After a call to setenv(), environment pointers to the old value and copies of the old value will be incorrect.

Code Block
bgColor#ccffcc#ffcccc
char *temp;
char *copy;

if ((temp = getenv("TEST_ENV")) != NULL) {
  copy = malloc(strlen(temp) + 1);
  if (copy != NULL) {
    strcpy(copy, temp);
  }
  else {
    /* handle error condition */
  }
}
/* ...program code... */
setenv("TEST_ENV", var, 1);
/* ...program code... */


printf("TEST_ENV: %s\n", temp);
printf("TEST_ENV: %s\n", copy);

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Code Block
bgColor#ccccff
char \*temp;
char \*copy;

if ((temp = getenv("TEST_ENV")) \!= NULL) {
   copy = malloc(strlen(temp) + 1);
   if (copy \!= NULL)
{ {     
      strcpy(copy, temp);   
   }
   else {
      /* handle error condition */
   }
}
/* ...program code... */
setenv("TEST_ENV", var, 1);
/* ...program code... */

if ((temp = getenv("TEST_ENV")) != NULL) {
   copy = malloc(strlen(temp) + 1);
   if (copy != NULL) {    
      strcpy(copy, temp);  }
   }
   else
   {     
      /* handle error condition */   
   }
}

printf("TEST_ENV: %s\n", temp);
printf("TEST_ENV: %s\n", copy);

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