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* fix aliasing-based undefined behavior in string functionsRich Felker2018-09-261-2/+6
| | | | | | | | | use the GNU C may_alias attribute if available, and fallback to naive byte-by-byte loops if __GNUC__ is not defined. this patch has been written to minimize changes so that history remains reviewable; it does not attempt to bring the affected code into a more consistent or elegant form.
* include cleanups: remove unused headers and add feature test macrosSzabolcs Nagy2013-12-121-1/+0
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* slightly cleaner strlen, also seems to compile to better codeRich Felker2012-09-271-6/+4
| | | | | | | testing with gcc 4.6.3 on x86, -Os, the old version does a duplicate null byte check after the first loop. this is purely the compiler being stupid, but the old code was also stupid and unintuitive in how it expressed the check.
* initial check-in, version 0.5.0 v0.5.0Rich Felker2011-02-121-0/+21