1 files changed, 38 insertions, 0 deletions
diff --git a/2.27.1/src/text_format/print.rs b/2.27.1/src/text_format/print.rs
new file mode 100644
index 0000000..397e8cd
--- /dev/null
+++ b/2.27.1/src/text_format/print.rs
@@ -0,0 +1,38 @@
+#[doc(hidden)]
+pub fn quote_bytes_to(bytes: &[u8], buf: &mut String) {
+    for &c in bytes {
+        match c {
+            b'\n' => buf.push_str(r"\n"),
+            b'\r' => buf.push_str(r"\r"),
+            b'\t' => buf.push_str(r"\t"),
+            b'\'' => buf.push_str("\\\'"),
+            b'"' => buf.push_str("\\\""),
+            b'\\' => buf.push_str(r"\\"),
+            b'\x20'..=b'\x7e' => buf.push(c as char),
+            _ => {
+                buf.push('\\');
+                buf.push((b'0' + (c >> 6)) as char);
+                buf.push((b'0' + ((c >> 3) & 7)) as char);
+                buf.push((b'0' + (c & 7)) as char);
+            }
+        }
+    }
+}
+
+pub(crate) fn quote_escape_bytes_to(bytes: &[u8], buf: &mut String) {
+    buf.push('"');
+    quote_bytes_to(bytes, buf);
+    buf.push('"');
+}
+
+#[doc(hidden)]
+pub fn quote_escape_bytes(bytes: &[u8]) -> String {
+    let mut r = String::new();
+    quote_escape_bytes_to(bytes, &mut r);
+    r
+}
+
+pub(crate) fn print_str_to(s: &str, buf: &mut String) {
+    // TODO: keep printable Unicode
+    quote_escape_bytes_to(s.as_bytes(), buf);
+}