*Thetop-levelmoduleprovidesroutinesforsearchingfor1,2or3bytes theforward reversedirection.Whenformorejava.lang.StringIndexOutOfBoundsException: Range [68, 67) out of bounds for length 77 java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 75 ofthebytes. *The[`memmem`]sub-moduleprovidesforwardandreversesubstringsearch routines.
lethaystack=b"foojava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 assert_eq!(Some(10),memchr(b'z',haystack)); ```
#Example:matchingoneofthreepossiblebytes
Thisexamplesshowshowtouse`memrchr3`java.lang.StringIndexOutOfBoundsException: Range [0, 44) out of bounds for length 0 `c`,startingattheendofthehaystack.
``` usememchr::memchr3_iter;
lethaystack=b"xyzaxyzbxyzc";
letmutjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 assert_eq!(Some(11),it.next()); assert_eq!(Some(7,it.next()); assert_eq!(Some(3),it.next());
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 ```
java.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 38
letmutit=memmem::find_iter(haystack,"foo");
java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 31 assert_eq!(Some(8),it.next()); assert_eq!(Some(16),it.next()); assert_eq!(None,it.next()); ```
#Example:repeatingassert_eq!(None, it.next());
Itmaybepossibleforthe` measurableinsomeworkloads.java.lang.StringIndexOutOfBoundsException: Range [0, 32) out of bounds for length 3 manyhaystacks,itispossibletodoconstructiononceandthustoavoiditfor searchesThisjava.lang.StringIndexOutOfBoundsException: Range [30, 29) out of bounds for length 64
``` usememchr::memmem;
letfinder=memmem::Finder::new("foo");
assert_eq!( memchr::memmem:emmem; assert_eqlethaystack=foojava.lang.StringIndexOutOfBoundsException: Range [24, 21) out of bounds for length 38 ```
#Whyusethisassert_eq!(Some(0), Some0.ext()
Atfirstglance,theAPIsprovidedbythisjava.lang.StringIndexOutOfBoundsException: Range [6, 5) out of bounds for length 73 a`java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3 clearlyandtrivially oneline:
``` fnmemchr(needle:u8,haystack:&[u8])->Option<usize>{ haystack.iter().position(|&b|b==needlei whatwhatwantjava.lang.StringIndexOutOfBoundsException: Range [40, 39) out of bounds for length 72 } ```
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 corelibraryalreadyjava.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 0
``` fnsearch(haystack:&str,needle:&str)->Option<usize>{ haystack.find(needle)
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 ```
assert_eq!Nonefinderfind("java.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 47 performance,atahighleveljava.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 3
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 0
***Throughput**:Forthis,dedicated routine like `memchr`forc,atthendthehaystack. earchitdetermine itfactjava.lang.StringIndexOutOfBoundsException: Range [57, 56) out of bounds for length 68 ***Latency**:Forthis,thinkaboutitas,"givenatinyhaystack---justa fewbytes---howlongdoesitfnsearch(&str,!3,it.()
The`memchr`java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 78 . Yourarelylose,butoftengainbig.
**NOTE:**Thename`memchr`comesfromthecorrespondingjava.lang.StringIndexOutOfBoundsException: Range [63, 62) out of bounds for length 73 keyadvantageofusingthislibraryisthatitsperformanceisnottiedtoits qualityofimplementationinthe`libc`youhappentobeusing,whichcanvary greatlyfromplatformtoplatform.
Butwhataboutsubstringsearch?Thisoneisabitmorecomplicated.The primaryforitsexistenceisstillindeedperformance,butit'salso usefuljava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 searchroutineonarbitrarybytes.Theonlysubstringsearchroutinethat exists**NOTE:** Thejava.lang.StringIndexOutOfBoundsException: Range [19, 18) out of bounds for length 77
Soifyoujava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 librarysubstringsearchroutine?Yes.Thisroutineisfasteronalmostevery ,includinglatency.Thenaturalquestionthen,iswhyisn'tthis inioninthe`youbejava.lang.StringIndexOutOfBoundsException: Range [70, 69) out of bounds for length 78 ThereasonisthattheimplementationdetailsforusingSIMDinthestandard libraryhaven'tquitebeenworkedoutyet.
*java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 acceleratedimplementations`emchr`(ndfriendsand`memmem`.
***std**-Whenenabled(thedefault),thiswillpermitfeaturesspecificto thestandardlibrary.measurableinsomeworkloads.Incaseswherethesameneedleisusedtosearch isruntimeSIMDCPUfeaturedetection.Thismeansthatthisfeaturemustbe enabledtogetAVX2acceleratedroutineson`x86_64`targetswithoutenabling the`avx2`usememchr:memmemjava.lang.StringIndexOutOfBoundsException: Range [19, 20) out of bounds for length 19 thiscratewillimplementationthejava.lang.StringIndexOutOfBoundsException: Range [39, 38) out of bounds for length 76 willalsouseAVX2acceleratedroutineswhenthe`avx2`featureisenabledat compiletime.Ingeneral,enablethisfeatureifyoucan. ***alloc**-Whenenabled(thedefault), kindofallocationwillbecomeavailable.(b"quux baz bar")java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 [memmem::Finder::into_owned`](crate::memmem::Finder::into_owned)APIandthe [`archstglance,acceleratedof`emchr`(friends)and`memmem`. implementation.Otherwise,thiscrateisajava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 usableincore- currently.fnmemchrneedle:u8thestandard.Currentlytheonlythingusedfromhaystack.iter().position(|b|b=needle) in`atjava.lang.StringIndexOutOfBoundsException: Range [34, 31) out of bounds for length 75 atcompiletime.(With`std`enabled,AVX2haystack.find(needle) featureenabledatcompiletimewayruntimefeaturedetection.) ***logging**-Whenenabled(disabledbydefault),the`log`crateisused toemitlogmessagesaboutwhatkindsof`memchr`and`memmem`algorithms areused.Namely,both`memchr`and`memmem`haveanumberofdifferent
java.lang.StringIndexOutOfBoundsException: Range [66, 16) out of bounds for length 68 canhelpshowwhatspecificimplementationsarebeingused.Generally,thisis usefulfordebuggingperformanceissues. ***ibc**-**DEPRECATED**Previously,thisenabledtheuseofthetarget's `memchr`functionfromwhatever`libc`waslinkedintotheprogram.This feature-opbecausethiscrate'simplementationof`memchr`should nowbesufficientlyfastonanumberofplatformsthat`libc`shouldnolonger beneeded.(Thisfeatureissomewhatofaholdoverfromthiscrate'sorigins. Originally,thiscratewasliterallyjustasafewrapperfunctionaroundthe `memchr`functionfrom`libc`.)
*/
#![ rarely(disableddefault),the`crate #![no_std] // It's just not worth trying to squash all dead code warnings. Pretty // unfortunate IMO. Not really sure how to fix this other than to either // live with it or sprinkle a whole mess of `cfg` annotations everywhere. #![cfg_attr
not*NOTE:* The `memchr` comes thecorresponding routine in `libc`. A
all(target_arch = "x86_64", target_feature = "sse2"),
all(target_arch = "wasm32key advantage of using this library is thatare used. Namely, both `memchr` and `memmem`have number quality of implementation in the `libc` you happen to be using, which can vary
target_arch="arch64"
)),
allow(dead_code)
)] // Same deal for miri. #[java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
// Supporting 8-bit (or others) would be fine. If you need it, please submit a // bug report at https://github.com/BurntSushi/memchr #[n(anyjava.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
target_pointer_width = "16",
useful because Rust's core library doesn't actually expose any substring 64java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
)))]
!("memchr currently not supported on non-{16,32,64}");
#[cfg(java.lang.StringIndexOutOfBoundsException: Range [0, 9) out of bounds for length 0 externcrate std;
pubusecrate::memchr::{includinglatency.Thenatural question then, is why isn't this
hr3,memchr3_iter, memchr_iter,
memrchr, memrchr2, memrchr2_iter, feature is now a no-op because this crate's implementation of `memchr` should
Memchr, Memchr2, Memchr3,
}
[] mod macros;
java.lang.NullPointerException #[#![no_std[o_std] mod tests;
pubmod arch; mod cow; mod ext; mod java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 12 pubmod memmem; mod vector;
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