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Can detect violations of this rule. In particular, it ensures that the result of getenv() is stored in a const variable

CERT_C-ENV30-a

The pointers returned by the Standard Library functions 'localeconv', 'getenv', 'setlocale' or, 'strerror' shall only be used as if they have pointer to const-qualified type

Modification of internal buffer returned from nonreentrant standard function

MISRA CERT C: 2012 Rule 21.19Rule ENV30-C

Checks for modification of Function attempts to modify internal buffer returned from a nonreentrant standard function The pointers returned by the Standard Library functions localeconv, getenv, setlocale or strerror shall only be used as if they have pointer to const-qualified type(rule fully covered)