Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/third_party/rust/unix_str/src/sys_common/bytestring.rs b/third_party/rust/unix_str/src/sys_common/bytestring.rs
new file mode 100644
index 0000000000..ac6b7e893f
--- /dev/null
+++ b/third_party/rust/unix_str/src/sys_common/bytestring.rs
@@ -0,0 +1,45 @@
+use crate::lossy::{Utf8Lossy, Utf8LossyChunk};
+use core::fmt::{Formatter, Result, Write};
+
+pub fn debug_fmt_bytestring(slice: &[u8], f: &mut Formatter<'_>) -> Result {
+    // Writes out a valid unicode string with the correct escape sequences
+    fn write_str_escaped(f: &mut Formatter<'_>, s: &str) -> Result {
+        for c in s.chars().flat_map(|c| c.escape_debug()) {
+            f.write_char(c)?
+        }
+        Ok(())
+    }
+
+    f.write_str("\"")?;
+    for Utf8LossyChunk { valid, broken } in Utf8Lossy::from_bytes(slice).chunks() {
+        write_str_escaped(f, valid)?;
+        for b in broken {
+            write!(f, "\\x{:02X}", b)?;
+        }
+    }
+    f.write_str("\"")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::fmt::{Debug, Formatter, Result};
+    use alloc::format;
+
+    #[test]
+    fn smoke() {
+        struct Helper<'a>(&'a [u8]);
+
+        impl Debug for Helper<'_> {
+            fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+                debug_fmt_bytestring(self.0, f)
+            }
+        }
+
+        let input = b"\xF0hello,\tworld";
+        let expected = r#""\xF0hello,\tworld""#;
+        let output = format!("{:?}", Helper(input));
+
+        assert!(output == expected);
+    }
+}