library: Remove definitions and reexports of strlen from libstd

library/std/src/sys/hermit/mod.rs

@@ -71,16 +71,6 @@ pub fn unsupported_err() -> crate::io::Error {
  )
 }
 
-pub unsafe fn strlen(start: *const c_char) -> usize {
- let mut str = start;
-
- while *str != 0 {
- str = str.offset(1);
- }
-
- (str as usize) - (start as usize)
-}
-
 #[no_mangle]
 pub extern "C" fn floor(x: f64) -> f64 {
  unsafe { intrinsics::floorf64(x) }

library/std/src/sys/sgx/mod.rs

@@ -5,7 +5,6 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 
 use crate::io::ErrorKind;
-use crate::os::raw::c_char;
 use crate::sync::atomic::{AtomicBool, Ordering};
 
 pub mod abi;
@@ -130,15 +129,6 @@ pub fn decode_error_kind(code: i32) -> ErrorKind {
  }
 }
 
-pub unsafe fn strlen(mut s: *const c_char) -> usize {
- let mut n = 0;
- while unsafe { *s } != 0 {
- n += 1;
- s = unsafe { s.offset(1) };
- }
- return n;
-}
-
 pub fn abort_internal() -> ! {
  abi::usercalls::exit(true)
 }

library/std/src/sys/solid/mod.rs

@@ -99,5 +99,3 @@ pub fn hashmap_random_keys() -> (u64, u64) {
  (x1, x2)
  }
 }
-
-pub use libc::strlen;

library/std/src/sys/unix/mod.rs

@@ -3,7 +3,6 @@
 use crate::io::ErrorKind;
 
 pub use self::rand::hashmap_random_keys;
-pub use libc::strlen;
 
 #[cfg(not(target_os = "espidf"))]
 #[macro_use]

library/std/src/sys/unsupported/common.rs

@@ -4,10 +4,6 @@ pub mod memchr {
  pub use core::slice::memchr::{memchr, memrchr};
 }
 
-// This is not necessarily correct. May want to consider making it part of the
-// spec definition?
-use crate::os::raw::c_char;
-
 // SAFETY: must be called only once during runtime initialization.
 // NOTE: this is not guaranteed to run, for example when Rust code is called externally.
 pub unsafe fn init(_argc: isize, _argv: *const *const u8) {}
@@ -38,15 +34,3 @@ pub fn abort_internal() -> ! {
 pub fn hashmap_random_keys() -> (u64, u64) {
  (1, 2)
 }
-
-pub unsafe fn strlen(mut s: *const c_char) -> usize {
- // SAFETY: The caller must guarantee `s` points to a valid 0-terminated string.
- unsafe {
- let mut n = 0;
- while *s != 0 {
- n += 1;
- s = s.offset(1);
- }
- n
- }
-}

library/std/src/sys/windows/mod.rs

@@ -7,7 +7,6 @@ use crate::path::PathBuf;
 use crate::time::Duration;
 
 pub use self::rand::hashmap_random_keys;
-pub use libc::strlen;
 
 #[macro_use]
 pub mod compat;