Zbigniew Jędrzejewski-Szmek
52abc9fe96
asprintf is nice to use, but the _documented_ error return convention is unclear: > If memory allocation wasn't possible, or some other error occurs, > these functions will return -1, and the contents of strp are undefined. What exactly "undefined" means is up for debate: if it was really undefined, the caller wouldn't be able to meaningfully clean up, because they wouldn't know if strp is a valid pointer. So far we interpreted "undefined" — in some parts of the code base — as "either NULL or a valid pointer that needs to be freed", and — in other parts of the codebase — as "always NULL". I checked glibc and musl, and they both uncoditionally set the output pointer to NULL on failure. There is also no information _why_ asprintf failed. It could be an allocation error or format string error. But we just don't have this information. Let's add a wrapper that either returns a good string or a NULL pointer. Since there's just one failure result, we don't need a separate return value and an output argument and can simplify callers.
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