mirror of https://github.com/mkerrisk/man-pages
getline.3: !*lineptr is sufficient
No implementation or spec requires *n to be 0 to allocate a new buffer: * musl checks for !*lineptr (and sets *n=0 for later allocations) * glibc checks for !*lineptr || !*n (but only because it allocates early) * NetBSD checks for !*lineptr (and sets *n=0 for later allocations) (but specifies *n => mlen(*lineptr) >= *n as a precondition, to which this appears to be an exception) * FreeBSD checks for !*lineptr and sets *n=0 (and specifies !*lineptr as sufficient) * Lastly, POSIX.1-2017 specifies: > If *n is non-zero, the application shall ensure that *lineptr > either points to an object of size at least *n bytes, > or is a null pointer. The new wording matches POSIX, even if it arrives at the point slightly differently Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -59,9 +59,7 @@ one was found.
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.PP
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If
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.I "*lineptr"
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is set to NULL and
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.I *n
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is set 0 before the call, then
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is set to NULL before the call, then
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.BR getline ()
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will allocate a buffer for storing the line.
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This buffer should be freed by the user program
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