allow File::write() to take a Span

src/core/Buffer.cc

@@ -88,8 +88,7 @@ bool Buffer::write_to_file(const char * filename)
         bytes_written += pd->length;
         if (pd->eol())
         {
-            if (!file.write(LineEndings::spans[m_line_endings].start,
-                        LineEndings::spans[m_line_endings].length))
+            if (!file.write(LineEndings::spans[m_line_endings]))
             {
                 return false;
             }
@@ -99,8 +98,7 @@ bool Buffer::write_to_file(const char * filename)
 
     if (m_eol_at_eof && bytes_written > 0u)
     {
-        if (!file.write(LineEndings::spans[m_line_endings].start,
-                    LineEndings::spans[m_line_endings].length))
+        if (!file.write(LineEndings::spans[m_line_endings]))
         {
             return false;
         }

src/core/File.h

@@ -3,6 +3,7 @@
 
 #include <stdint.h>
 #include <stdlib.h>
+#include "Span.h"
 
 class File
 {
@@ -14,6 +15,10 @@ public:
     size_t get_size();
     bool read(uint8_t * buf, size_t size);
     bool write(const uint8_t * buf, size_t size);
+    bool write(const Span & span)
+    {
+        return write(span.start, span.length);
+    }
 
 protected:
     int m_fd;