This crate provides a safe interface libc's memchr and memrchr.
This crate also provides fallback implementations when either function is
unavailable.
Dual-licensed under MIT or the UNLICENSE.
memchr links to the standard library by default, but you can disable the
use_std feature if you want to use it in a #![no_std] crate:
toml
[dependencies]
memchr = { version = "1.0", default-features = false }
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