SEI CERT C Coding Standard

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Do not modify the value returned by the {{getenv()}} function. Create a copy and make your changes locally, so that they are not overwritten.  According to C99 \[[ISO/IEC 9899-1999:TC2|AA. C References#ISO/IEC 9899-1999TC21999]\]:

The getenv function returns a pointer to a string associated with the matched list member. The string pointed to shall not be modified by the program, but may be overwritten by a subsequent call to the getenv function. If the specified name cannot be found, a null pointer is returned.

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