Refactor: Move argument building into args

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

@@ -8,12 +8,14 @@ mod tests;
 
 use crate::ffi::OsString;
 use crate::fmt;
+use crate::io;
 use crate::marker::PhantomData;
 use crate::num::NonZeroU16;
 use crate::os::windows::prelude::*;
 use crate::path::PathBuf;
 use crate::ptr::NonNull;
 use crate::sys::c;
+use crate::sys::process::ensure_no_nuls;
 use crate::sys::windows::os::current_exe;
 use crate::vec;
 
@@ -234,3 +236,66 @@ impl Iterator for WStrUnits<'_> {
         }
     }
 }
+
+#[derive(Debug)]
+pub(crate) enum Arg {
+    /// Add quotes (if needed)
+    Regular(OsString),
+    /// Append raw string without quoting
+    Raw(OsString),
+}
+
+enum Quote {
+    // Every arg is quoted
+    Always,
+    // Whitespace and empty args are quoted
+    Auto,
+    // Arg appended without any changes (#29494)
+    Never,
+}
+
+pub(crate) fn append_arg(cmd: &mut Vec<u16>, arg: &Arg, force_quotes: bool) -> io::Result<()> {
+    let (arg, quote) = match arg {
+        Arg::Regular(arg) => (arg, if force_quotes { Quote::Always } else { Quote::Auto }),
+        Arg::Raw(arg) => (arg, Quote::Never),
+    };
+
+    // If an argument has 0 characters then we need to quote it to ensure
+    // that it actually gets passed through on the command line or otherwise
+    // it will be dropped entirely when parsed on the other end.
+    ensure_no_nuls(arg)?;
+    let arg_bytes = arg.bytes();
+    let (quote, escape) = match quote {
+        Quote::Always => (true, true),
+        Quote::Auto => {
+            (arg_bytes.iter().any(|c| *c == b' ' || *c == b'\t') || arg_bytes.is_empty(), true)
+        }
+        Quote::Never => (false, false),
+    };
+    if quote {
+        cmd.push('"' as u16);
+    }
+
+    let mut backslashes: usize = 0;
+    for x in arg.encode_wide() {
+        if escape {
+            if x == '\\' as u16 {
+                backslashes += 1;
+            } else {
+                if x == '"' as u16 {
+                    // Add n+1 backslashes to total 2n+1 before internal '"'.
+                    cmd.extend((0..=backslashes).map(|_| '\\' as u16));
+                }
+                backslashes = 0;
+            }
+        }
+        cmd.push(x);
+    }
+
+    if quote {
+        // Add n backslashes to total 2n before ending '"'.
+        cmd.extend((0..backslashes).map(|_| '\\' as u16));
+        cmd.push('"' as u16);
+    }
+    Ok(())
+}

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

@@ -17,6 +17,7 @@ use crate::os::windows::ffi::{OsStrExt, OsStringExt};
 use crate::os::windows::io::{AsRawHandle, FromRawHandle, IntoRawHandle};
 use crate::path::{Path, PathBuf};
 use crate::ptr;
+use crate::sys::args::{self, Arg};
 use crate::sys::c;
 use crate::sys::c::NonZeroDWORD;
 use crate::sys::cvt;
@@ -27,7 +28,7 @@ use crate::sys::pipe::{self, AnonPipe};
 use crate::sys::stdio;
 use crate::sys_common::mutex::StaticMutex;
 use crate::sys_common::process::{CommandEnv, CommandEnvs};
-use crate::sys_common::{AsInner, IntoInner};
+use crate::sys_common::IntoInner;
 
 use libc::{c_void, EXIT_FAILURE, EXIT_SUCCESS};
 
@@ -147,7 +148,7 @@ impl AsRef<OsStr> for EnvKey {
     }
 }
 
-fn ensure_no_nuls<T: AsRef<OsStr>>(str: T) -> io::Result<T> {
+pub(crate) fn ensure_no_nuls<T: AsRef<OsStr>>(str: T) -> io::Result<T> {
     if str.as_ref().encode_wide().any(|b| b == 0) {
         Err(io::const_io_error!(ErrorKind::InvalidInput, "nul byte found in provided data"))
     } else {
@@ -181,14 +182,6 @@ pub struct StdioPipes {
     pub stderr: Option<AnonPipe>,
 }
 
-#[derive(Debug)]
-enum Arg {
-    /// Add quotes (if needed)
-    Regular(OsString),
-    /// Append raw string without quoting
-    Raw(OsString),
-}
-
 impl Command {
     pub fn new(program: &OsStr) -> Command {
         Command {
@@ -724,15 +717,6 @@ fn zeroed_process_information() -> c::PROCESS_INFORMATION {
     }
 }
 
-enum Quote {
-    // Every arg is quoted
-    Always,
-    // Whitespace and empty args are quoted
-    Auto,
-    // Arg appended without any changes (#29494)
-    Never,
-}
-
 // Produces a wide string *without terminating null*; returns an error if
 // `prog` or any of the `args` contain a nul.
 fn make_command_line(
@@ -763,57 +747,9 @@ fn make_command_line(
 
     for arg in args {
         cmd.push(' ' as u16);
-        let (arg, quote) = match arg {
-            Arg::Regular(arg) => (arg, if force_quotes { Quote::Always } else { Quote::Auto }),
-            Arg::Raw(arg) => (arg, Quote::Never),
-        };
-        append_arg(&mut cmd, arg, quote)?;
-    }
-    if is_batch_file {
-        cmd.push(b'"' as u16);
-    }
-    return Ok(cmd);
-
-    fn append_arg(cmd: &mut Vec<u16>, arg: &OsStr, quote: Quote) -> io::Result<()> {
-        // If an argument has 0 characters then we need to quote it to ensure
-        // that it actually gets passed through on the command line or otherwise
-        // it will be dropped entirely when parsed on the other end.
-        ensure_no_nuls(arg)?;
-        let arg_bytes = &arg.as_inner().inner.as_inner();
-        let (quote, escape) = match quote {
-            Quote::Always => (true, true),
-            Quote::Auto => {
-                (arg_bytes.iter().any(|c| *c == b' ' || *c == b'\t') || arg_bytes.is_empty(), true)
-            }
-            Quote::Never => (false, false),
-        };
-        if quote {
-            cmd.push('"' as u16);
-        }
-
-        let mut backslashes: usize = 0;
-        for x in arg.encode_wide() {
-            if escape {
-                if x == '\\' as u16 {
-                    backslashes += 1;
-                } else {
-                    if x == '"' as u16 {
-                        // Add n+1 backslashes to total 2n+1 before internal '"'.
-                        cmd.extend((0..=backslashes).map(|_| '\\' as u16));
-                    }
-                    backslashes = 0;
-                }
-            }
-            cmd.push(x);
-        }
-
-        if quote {
-            // Add n backslashes to total 2n before ending '"'.
-            cmd.extend((0..backslashes).map(|_| '\\' as u16));
-            cmd.push('"' as u16);
-        }
-        Ok(())
+        args::append_arg(&mut cmd, arg, force_quotes)?;
     }
+    Ok(cmd)
 }
 
 fn make_envp(maybe_env: Option<BTreeMap<EnvKey, OsString>>) -> io::Result<(*mut c_void, Vec<u16>)> {