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According to C99 \[[ISO/IEC 9899-1999:TC2|AA. C References#ISO/IEC 9899-1999:TC21999TC2]\]: |
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 thegetenv
function. If the specified name cannot
be found, a null pointer is returned.
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