dd: treat arg as bytes if it contains 'B'

src/uu/dd/src/parseargs.rs

@@ -275,7 +275,7 @@ impl Parser {
 
     fn parse_n(val: &str) -> Result<Num, ParseError> {
         let n = parse_bytes_with_opt_multiplier(val)?;
-        Ok(if val.ends_with('B') {
+        Ok(if val.contains('B') {
             Num::Bytes(n)
         } else {
             Num::Blocks(n)
@@ -631,8 +631,9 @@ fn conversion_mode(
 #[cfg(test)]
 mod tests {
 
-    use crate::parseargs::parse_bytes_with_opt_multiplier;
-
+    use crate::parseargs::{parse_bytes_with_opt_multiplier, Parser};
+    use crate::Num;
+    use std::matches;
     const BIG: &str = "9999999999999999999999999999999999999999999999999999999999999";
 
     #[test]
@@ -659,4 +660,13 @@ mod tests {
             2 * 2 * (3 * 2) // (1 * 2) * (2 * 1) * (3 * 2)
         );
     }
+    #[test]
+    fn test_parse_n() {
+        for arg in ["1x8x4", "1c", "123b", "123w"] {
+            assert!(matches!(Parser::parse_n(arg), Ok(Num::Blocks(_))));
+        }
+        for arg in ["1Bx8x4", "2Bx8", "2Bx8B", "2x8B"] {
+            assert!(matches!(Parser::parse_n(arg), Ok(Num::Bytes(_))));
+        }
+    }
 }

tests/by-util/test_dd.rs

@@ -1405,6 +1405,36 @@ fn test_bytes_suffix() {
         .stdout_only("\0\0\0abcdef");
 }
 
+#[test]
+// the recursive nature of the suffix allows any string with a 'B' in it treated as bytes.
+fn test_bytes_suffix_recursive() {
+    new_ucmd!()
+        .args(&["count=2Bx2", "status=none"])
+        .pipe_in("abcdef")
+        .succeeds()
+        .stdout_only("abcd");
+    new_ucmd!()
+        .args(&["skip=2Bx2", "status=none"])
+        .pipe_in("abcdef")
+        .succeeds()
+        .stdout_only("ef");
+    new_ucmd!()
+        .args(&["iseek=2Bx2", "status=none"])
+        .pipe_in("abcdef")
+        .succeeds()
+        .stdout_only("ef");
+    new_ucmd!()
+        .args(&["seek=2Bx2", "status=none"])
+        .pipe_in("abcdef")
+        .succeeds()
+        .stdout_only("\0\0\0\0abcdef");
+    new_ucmd!()
+        .args(&["oseek=2Bx2", "status=none"])
+        .pipe_in("abcdef")
+        .succeeds()
+        .stdout_only("\0\0\0\0abcdef");
+}
+
 /// Test for "conv=sync" with a slow reader.
 #[cfg(not(windows))]
 #[test]