Rollup merge of rust-lang#100767 - kadiwa4:escape_ascii, r=jackh726

Remove manual <[u8]>::escape_ascii

`@rustbot` label: +C-cleanup

Author: Dylan-DPC

core/src/ffi/c_str.rs

@@ -1,7 +1,6 @@
-use crate::ascii;
 use crate::cmp::Ordering;
 use crate::ffi::c_char;
-use crate::fmt::{self, Write};
+use crate::fmt;
 use crate::intrinsics;
 use crate::ops;
 use crate::slice;
@@ -161,11 +160,7 @@ impl fmt::Display for FromBytesUntilNulError {
 #[stable(feature = "cstr_debug", since = "1.3.0")]
 impl fmt::Debug for CStr {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "\"")?;
-        for byte in self.to_bytes().iter().flat_map(|&b| ascii::escape_default(b)) {
-            f.write_char(byte as char)?;
-        }
-        write!(f, "\"")
+        write!(f, "\"{}\"", self.to_bytes().escape_ascii())
     }
 }
 

proc_macro/src/lib.rs

@@ -1353,12 +1353,7 @@ impl Literal {
     /// Byte string literal.
     #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
     pub fn byte_string(bytes: &[u8]) -> Literal {
-        let string = bytes
-            .iter()
-            .cloned()
-            .flat_map(std::ascii::escape_default)
-            .map(Into::<char>::into)
-            .collect::<String>();
+        let string = bytes.escape_ascii().to_string();
         Literal::new(bridge::LitKind::ByteStr, &string, None)
     }
 

std/src/os/unix/net/addr.rs

@@ -2,7 +2,7 @@ use crate::ffi::OsStr;
 use crate::os::unix::ffi::OsStrExt;
 use crate::path::Path;
 use crate::sys::cvt;
-use crate::{ascii, fmt, io, mem, ptr};
+use crate::{fmt, io, mem, ptr};
 
 // FIXME(#43348): Make libc adapt #[doc(cfg(...))] so we don't need these fake definitions here?
 #[cfg(not(unix))]
@@ -64,18 +64,6 @@ enum AddressKind<'a> {
     Abstract(&'a [u8]),
 }
 
-struct AsciiEscaped<'a>(&'a [u8]);
-
-impl<'a> fmt::Display for AsciiEscaped<'a> {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(fmt, "\"")?;
-        for byte in self.0.iter().cloned().flat_map(ascii::escape_default) {
-            write!(fmt, "{}", byte as char)?;
-        }
-        write!(fmt, "\"")
-    }
-}
-
 /// An address associated with a Unix socket.
 ///
 /// # Examples
@@ -343,7 +331,7 @@ impl fmt::Debug for SocketAddr {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self.address() {
             AddressKind::Unnamed => write!(fmt, "(unnamed)"),
-            AddressKind::Abstract(name) => write!(fmt, "{} (abstract)", AsciiEscaped(name)),
+            AddressKind::Abstract(name) => write!(fmt, "\"{}\" (abstract)", name.escape_ascii()),
             AddressKind::Pathname(path) => write!(fmt, "{path:?} (pathname)"),
         }
     }