CI updates and minor cleanups

src/file.cpp

@@ -40,6 +40,7 @@
 #else
     UNUSED(name);
     UNUSED(mode);
+    // no error
 #endif
 }
 
@@ -88,7 +89,7 @@ bool FileBase::do_sopen() {
     else {
 #if (ACC_OS_DOS32) && defined(__DJGPP__)
         _fd = ::open(_name, _flags | _shflags, _mode);
-#elif defined(__MINT__)
+#elif (ACC_ARCH_M68K && ACC_OS_TOS && ACC_CC_GNUC) && defined(__MINT__)
         _fd = ::open(_name, _flags | (_shflags & O_SHMODE), _mode);
 #elif defined(SH_DENYRW)
         _fd = ::sopen(_name, _flags, _shflags, _mode);
@@ -98,6 +99,7 @@ bool FileBase::do_sopen() {
     }
     if (_fd < 0)
         return false;
+    st.st_size = 0;
     if (::fstat(_fd, &st) != 0)
         throwIOException(_name, errno);
     _length = st.st_size;
@@ -212,6 +214,20 @@ upx_off_t InputFile::seek(upx_off_t off, int whence) {
 
 upx_off_t InputFile::st_size_orig() const { return _length_orig; }
 
+int InputFile::dup() may_throw {
+    if (!isOpen())
+        throwIOException("bad dup");
+#if defined(HAVE_DUP) && (HAVE_DUP + 0 == 0)
+    errno = ENOSYS;
+    int r = -1;
+#else
+    int r = ::dup(getFd());
+#endif
+    if (r < 0)
+        throwIOException("dup", errno);
+    return r;
+}
+
 /*************************************************************************
 // OutputFile
 **************************************************************************/
@@ -333,6 +349,7 @@ void OutputFile::set_extent(upx_off_t offset, upx_off_t length) {
     super::set_extent(offset, length);
     bytes_written = 0;
     if (0 == offset && 0xffffffffLL == length) { // TODO: check all callers of this method
+        st.st_size = 0;
         if (::fstat(_fd, &st) != 0)
             throwIOException(_name, errno);
         _length = st.st_size - offset;