This crate provides two functions, memchr and memrchr, which exposes a
safe interface to the corresponding functions in libc. This crate also
provides fallback implementations when either function is unavailable.
Dual-licensed under MIT or the UNLICENSE.
Documentation
http://burntsushi.net/rustdoc/memchr/.
Performance
On my system (Linux/amd64), memchr is about an order of magnitude faster than
the more idiomatic haystack.iter().position(|&b| b == needle):
test iterator ... bench: 5,280 ns/iter (+/- 13) = 1893 MB/s
test iterator_reversed ... bench: 5,271 ns/iter (+/- 7) = 1897 MB/s
test libc_memchr ... bench: 202 ns/iter (+/- 0) = 49504 MB/s
test libc_memrchr ... bench: 197 ns/iter (+/- 1) = 50761 MB/s