Implement floor() using libm (esp-rs#272)

Author: ellishg

esp-wifi/Cargo.toml

@@ -29,6 +29,7 @@ embassy-sync = { workspace = true, optional = true }
 embassy-futures = { workspace = true, optional = true }
 embassy-net-driver = { workspace = true, optional = true }
 toml-cfg.workspace = true
+libm.workspace = true
 
 [features]
 default = [ "utils", "log" ]

esp-wifi/src/common_adapter/mod.rs

@@ -457,6 +457,6 @@ pub unsafe extern "C" fn strrchr(_s: *const (), _c: u32) -> *const u8 {
 
 #[no_mangle]
 #[linkage = "weak"]
-pub unsafe extern "C" fn floor(_v: f64) -> f64 {
-    todo!("floor")
+pub unsafe extern "C" fn floor(v: f64) -> f64 {
+    libm::floor(v)
 }