Replace string.c with optional tinyrlibc feature and release v0.4.0

CHANGELOG.md

@@ -8,6 +8,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 -
 
+## [0.4.0] - 2026-06-21
+
+### Changed
+
+- Remove the implementations of `strchr`, `strlen`, `strcspn` and `strspn` by default and add the `tinyrlibc` feature to pull them in from `tinyrlibc`.
+  When updating from an earlier version, enable the `tinyrlibc` feature.
+
 ## [0.3.2] - 2026-02-25
 
 ### Added

Cargo.toml

@@ -1,14 +1,17 @@
 [package]
 name = "littlefs2-sys"
 description = "Low-level bindings to littlefs"
-version = "0.3.2"
+version = "0.4.0"
 authors = ["Nicolas Stalder <n@stalder.io>", "The Trussed Developers"]
 edition = "2018"
 license = "BSD-3-Clause"
 readme = "README.md"
 categories = ["embedded", "filesystem", "no-std"]
 repository = "https://github.com/nickray/littlefs2-sys"
 
+[dependencies]
+tinyrlibc = { version = "0.5", default-features = false, features = ["strchr", "strlen", "strcspn", "strspn"], optional = true }
+
 [build-dependencies]
 bindgen = { version = "0.70.1", default-features = false , features = ["runtime"] }
 cc = "1"
@@ -20,6 +23,10 @@ malloc = []
 software-intrinsics = []
 multiversion = []
 
+# littlefs2-sys requires implementations of the strchr, strlen, strcspn and strspn functions.  If
+# these are not provided by a different source, enable this feature to pull them in from tinyrlibc.
+tinyrlibc = ["dep:tinyrlibc"]
+
 # unstable features -- enabling one of the following features may break semantic versioning guarantees
 
 # use a patched version of littlefs: https://github.com/trussed-dev/littlefs/releases/tag/v2.9-trussed.1

README.md

@@ -39,9 +39,6 @@ Upstream release: [v2.9.3][upstream-release]
 
 #### License
 
-<sup>littlefs is licensed under [BSD-3-Clause][bsd-3-clause], as are these bindings.</sup>
-<br>
-<sub>The file `string.c` is licensed under GPL-2.0.<br>
-Permissively licensed replacement implementation welcome!</sub>
+littlefs is licensed under [BSD-3-Clause][bsd-3-clause], as are these bindings.
 
 [bsd-3-clause]: https://github.com/ARMmbed/littlefs/blob/master/LICENSE.md

build.rs

@@ -37,8 +37,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         .include(&out_path)
         .include(littlefs_path)
         .file(format!("{littlefs_path}/lfs.c"))
-        .file(format!("{littlefs_path}/lfs_util.c"))
-        .file("string.c");
+        .file(format!("{littlefs_path}/lfs_util.c"));
 
     #[cfg(feature = "software-intrinsics")]
     let builder = builder.flag("-DLFS_NO_INTRINSICS");

src/lib.rs

@@ -2,4 +2,8 @@
 #![allow(non_upper_case_globals)]
 #![allow(non_camel_case_types)]
 
+// We need this extern crate statement to indicate that we want to link against tinyrlibc.
+#[cfg(feature = "tinyrlibc")]
+extern crate tinyrlibc;
+
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));