getenv() and i370-ibm-openedition

[Paul Gilmartin]

Hello, bug-ncurses,

In: http://pubs.opengroup.org/onlinepubs/9699919799/functions/getenv.html#tag_16_194_03
one may read:
    ...
char *getenv(const char *name);
    ...
^[CX] The returned string pointer might be invalidated or  the string content might be overwritten by a subsequent call to getenv(), ^[CX] setenv(), unsetenv(), or (if supported) putenv() ...

IBM is the only vendor I've known to exploit this behavior by copying the
string value into a volatile buffer.  (Their intent was to spare the programmer
the onus of keeping the argument to putenv() in static storage.)  This caused
me problems in Lynx; Tom Dickey generously incorporated my patch to copy the
returned value.

But I'm now informed that IBM supplies an alternative, __getenv(), which
simply returns a pointer to the string the programmer supplied to putenv()
after the "=".  Might the easy circumvention be:

    #if defined(__MVS__)
    #include <stdlib.h>
    #define getenv __getenv
    #endif

... so getenv is redefined somewhere after any header file mentioning
getenv but before any call to getenv() in ncurses?

Thanks,
gil