Fix s2 enterprise wpa (#3406)

* Don't use `strcasecmp` from ROM

* fmt

* CHANGELOG

esp-wifi/CHANGELOG.md

@@ -25,6 +25,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Allow `Configuration::None`, set country early, changed default power-save-mode to None (#3364)
 
+- Enterprise WPA fixed for ESP32-S2 (#3406)
+
 ### Removed
 
 ## [0.13.0] - 2025-02-24

esp-wifi/src/compat/misc.rs

@@ -83,6 +83,32 @@ unsafe extern "C" fn atoi(str: *const i8) -> i32 {
     res * sign
 }
 
+// We cannot just use the ROM function since it calls `__getreent`
+//
+// From docs: The __getreent() function returns a per-task pointer to struct
+// _reent in newlib libc. This structure is allocated on the TCB of each task.
+// i.e. it assumes a FreeRTOS task calling it.
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn strcasecmp(
+    s1: *const core::ffi::c_char,
+    s2: *const core::ffi::c_char,
+) -> i32 {
+    let mut i = 0;
+    loop {
+        unsafe {
+            let s1_i = s1.add(i);
+            let s2_i = s2.add(i);
+
+            let val = (*s1_i).to_ascii_lowercase() as i32 - (*s2_i).to_ascii_lowercase() as i32;
+            if val != 0 || *s1_i == 0 {
+                return val;
+            }
+        }
+
+        i += 1;
+    }
+}
+
 #[derive(Debug, Copy, Clone)]
 #[repr(C)]
 struct Tm {