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Even though I wrote them, I keep forgetting their semantics. In particular I can never quite remember off the top of my head whether they modify their input command line, or allocate it fresh. To make that clearer, I've made it a const parameter. (That means the output argstart pointers have the same awkward const -> mutable conversion as strchr - but then, strchr is itself precedent for that being the usual way to not-quite-handle that annoyance in C!)