On Mon, Jun 13, 2016 at 00:03:29 +0200, Daniel Pfeifer wrote:
> Can you show an example? To be clear: We are looking for a function,
> that has a code path for `str == NULL` and a *different* codepath for
> `str[0] = '\0'`.
As input to functions? Usually NULL means "unset". See properties,
variable values, etc. As an output, any place which doesn't care should
already be using GetSafeDefinition().
As a concrete example, `set(CACHE)` cares about NULL versus *s == NULL:
const char* existingValue = state->GetCacheEntryValue(variable);
if (existingValue &&
(state->GetCacheEntryType(variable) != cmState::UNINITIALIZED)) {
// if the set is trying to CACHE the value but the value
// is already in the cache and the type is not internal
// then leave now without setting any definitions in the cache
// or the makefile
if (cache && type != cmState::INTERNAL && !force) {
return true;
}
}
// if it is meant to be in the cache then define it in the cache
if (cache) {
this->Makefile->AddCacheDefinition(variable, value.c_str(), docstring,
type, force);
} else {
// add the definition
this->Makefile->AddDefinition(variable, value.c_str());
}
--Ben
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