langinfo and libgen cleanup

src/header/langinfo/mod.rs

@@ -202,13 +202,13 @@ pub const ABALTMON_12: nl_item = 80;
 pub unsafe extern "C" fn nl_langinfo(item: nl_item) -> *mut c_char {
     // Validate the item and perform the lookup
     let ptr = if (item as usize) < STRING_TABLE.len() {
-        STRING_TABLE[item as usize].as_ptr() as *const c_char
+        STRING_TABLE[item as usize].as_ptr().cast::<c_char>()
     } else {
         // Return a pointer to an empty string if the item is invalid
-        b"\0".as_ptr() as *const c_char
+        c"".as_ptr().cast::<c_char>()
     };
     // Mutable pointer is required (unsafe!)
-    ptr as *mut c_char
+    ptr.cast_mut()
 }
 
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/nl_langinfo_l.html>.

src/header/libgen/mod.rs

@@ -10,14 +10,14 @@ use crate::header::string::strlen;
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn basename(str: *mut c_char) -> *mut c_char {
     if str.is_null() || unsafe { strlen(str) == 0 } {
-        return ".\0".as_ptr() as *mut c_char;
+        return c".".as_ptr().cast_mut();
     }
     let mut end = unsafe { strlen(str) as isize - 1 };
     while end >= 0 && unsafe { *str.offset(end) == b'/' as c_char } {
         end -= 1;
     }
     if end == -1 {
-        return "/\0".as_ptr() as *mut c_char;
+        return c"/".as_ptr().cast_mut();
     }
     let mut begin = end;
     while begin >= 0 && unsafe { *str.offset(begin) != b'/' as c_char } {
@@ -25,7 +25,7 @@ pub unsafe extern "C" fn basename(str: *mut c_char) -> *mut c_char {
     }
     unsafe {
         *str.offset(end + 1) = 0;
-        str.offset(begin + 1) as *mut c_char
+        str.offset(begin + 1).cast::<c_char>()
     }
 }
 
@@ -33,7 +33,7 @@ pub unsafe extern "C" fn basename(str: *mut c_char) -> *mut c_char {
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn dirname(str: *mut c_char) -> *mut c_char {
     if str.is_null() || unsafe { strlen(str) == 0 } {
-        return ".\0".as_ptr() as *mut c_char;
+        return c".".as_ptr().cast_mut();
     }
     let mut end = unsafe { strlen(str) as isize - 1 };
     while end > 0 && unsafe { *str.offset(end) == b'/' as c_char } {
@@ -46,7 +46,7 @@ pub unsafe extern "C" fn dirname(str: *mut c_char) -> *mut c_char {
         end -= 1;
     }
     if end == -1 {
-        return ".\0".as_ptr() as *mut c_char;
+        return c".".as_ptr().cast_mut();
     }
     unsafe {
         *str.offset(end + 1) = 0;