I'm using getenv("TEMP")
, but I'm getting a warning telling me to use _dupenv_s
.
I can't find an example of _dupenv_s on the net.
The docs read:
errno_t _dupenv_s(
char **buffer,
size_t *numberOfElements,
const char *varname
);
But what buffer are they referring to? I only have varname. Wouldn't it be better to avoid using a buffer?
_dupenv_s
is a Microsoft function, designed as a more secure form of getenv
.
_dupenv_s
allocates the buffer itself; you have to pass it a pointer to a pointer and it sets this to the address of the newly allocated buffer.
For example,
char* buf = nullptr;
size_t sz = 0;
if (_dupenv_s(&buf, &sz, "EnvVarName") == 0 && buf != nullptr)
{
printf("EnvVarName = %s\n", buf);
free(buf);
}
Note that you're responsible for freeing the returned buffer.
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