bzip2.rs: improve test coverage

.github/workflows/checks.yaml

@@ -87,7 +87,7 @@ jobs:
         env:
           RUST_BACKTRACE: 1
       - name: cargo test with llvm-cov
-        run: cargo llvm-cov --target ${{matrix.target}} ${{ matrix.features }} --lcov --output-path lcov.info --ignore-filename-regex "bzip2\.rs|test-libbzip2" --workspace
+        run: cargo llvm-cov --target ${{matrix.target}} ${{ matrix.features }} --lcov --output-path lcov.info --ignore-filename-regex "test-libbzip2" --workspace
         env:
           RUST_BACKTRACE: 1
         if: matrix.os != 'windows-2022'

bzip2.rs

@@ -467,7 +467,7 @@
                         } else {
                             if noisy {
                                 eprintln!(
-                                    "{}: {}: trailing garbage after EOF ignored\n",
+                                    "\n{}: {}: trailing garbage after EOF ignored\n",
                                     CStr::from_ptr(progName).to_string_lossy(),
                                     CStr::from_ptr(inName.as_ptr()).to_string_lossy(),
                                 );
@@ -856,13 +856,14 @@
 }
 
 unsafe fn configError() -> ! {
-    eprint!(concat!(
+    const MSG: &str = concat!(
         "bzip2: I'm not configured correctly for this platform!\n",
         "\tI require Int32, Int16 and Char to have sizes\n",
         "\tof 4, 2 and 1 bytes to run properly, and they don't.\n",
         "\tProbably you can fix this by defining them correctly,\n",
         "\tand recompiling.  Bye!\n",
-    ));
+    );
+    eprint!("{}", MSG);
     setExit(3 as libc::c_int);
     exit(exitValue);
 }
@@ -1513,12 +1514,13 @@
             outStr = stdout;
             if inStr.is_null() {
                 eprintln!(
-                    "{}: Can't open input file {}:{}.",
+                    "{}: Can't open input file {}: {}.",
                     get_program_name().display(),
                     in_name.display(),
                     display_last_os_error(),
                 );
                 if !inStr.is_null() {
+                    // this is unreachable, but it exists in the original C source code
                     fclose(inStr);
                 }
                 setExit(1);