57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//
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// Original implementation taken from rust-memchr
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// Copyright 2015 Andrew Gallant, bluss and Nicolas Koch
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pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> {
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use libc;
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let p = unsafe {
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libc::memchr(
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haystack.as_ptr() as *const libc::c_void,
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needle as libc::c_int,
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haystack.len())
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};
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if p.is_null() {
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None
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} else {
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Some(p as usize - (haystack.as_ptr() as usize))
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}
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}
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pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
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#[cfg(target_os = "linux")]
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fn memrchr_specific(needle: u8, haystack: &[u8]) -> Option<usize> {
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use libc;
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// GNU's memrchr() will - unlike memchr() - error if haystack is empty.
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if haystack.is_empty() {return None}
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let p = unsafe {
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libc::memrchr(
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haystack.as_ptr() as *const libc::c_void,
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needle as libc::c_int,
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haystack.len())
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};
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if p.is_null() {
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None
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} else {
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Some(p as usize - (haystack.as_ptr() as usize))
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}
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}
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#[cfg(not(target_os = "linux"))]
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fn memrchr_specific(needle: u8, haystack: &[u8]) -> Option<usize> {
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::core::slice::memchr::memrchr(needle, haystack)
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}
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memrchr_specific(needle, haystack)
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}
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