mirror of https://github.com/rust-lang/rust
36 lines
760 B
Rust
36 lines
760 B
Rust
#![crate_type = "lib"]
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//@ compile-flags: -O
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use std::slice::Windows;
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// CHECK-LABEL: @naive_string_search
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#[no_mangle]
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pub fn naive_string_search(haystack: &str, needle: &str) -> Option<usize> {
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if needle.is_empty() {
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return Some(0);
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}
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// CHECK-NOT: panic
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// CHECK-NOT: fail
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haystack
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.as_bytes()
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.windows(needle.len())
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.position(|sub| sub == needle.as_bytes())
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}
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// CHECK-LABEL: @next
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#[no_mangle]
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pub fn next<'a>(w: &mut Windows<'a, u32>) -> Option<&'a [u32]> {
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// CHECK-NOT: panic
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// CHECK-NOT: fail
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w.next()
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}
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// CHECK-LABEL: @next_back
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#[no_mangle]
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pub fn next_back<'a>(w: &mut Windows<'a, u32>) -> Option<&'a [u32]> {
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// CHECK-NOT: panic
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// CHECK-NOT: fail
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w.next_back()
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}
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