Date: Wed, 13 Apr 2022 00:00:26 -0400 From: Rich Felker <dalias@...c.org> To: libc-coord@...ts.openwall.com Subject: stdio_ext.h extensions for gnulib Early on in musl's history, we added a set of further extensions in stdio_ext.h: size_t __freadahead(FILE *); const char *__freadptr(FILE *, size_t *); void __freadptrinc(FILE *, size_t); void __fseterr(FILE *); The purpose of these functions was to provide a way for gnulib to do the things they already insisted on doing, but without having access to the FILE representation internals (which is how they implemented these things for every other system at the time). The topic recently came up again via Toybox, where the author is not using gnulib but was looking for some of the same functionality. I'm told Bionic is on-board with adding these, and it might make sense to coordinate this with glibc and other libc implementations/other systems, or even propose these as some sort of standard. In the long term, having these would allow systems to decouple gnulib from their stdio internals, and eventually maybe even have the freedom to change stdio internals if it ever makes sense to do so. Rich
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