Make byte based iterator API handle the whole range [0, size]

Before this commit the valid range was [0, size) which represents
the file content. For the position at EOF (=size) a NUL byte is
returned which is not actually part of the underlying file.

This should fix various movements / editing operations at the end
of the file. For example Ctrl+w at the end of the command prompt.

1 files changed, 6 insertions, 1 deletions

diff --git a/text.h b/text.h
index 4f7c4dc..15d0ad1 100644
--- a/text.h
+++ b/text.h
@@ -56,9 +56,14 @@ bool text_iterator_valid(const Iterator*);
 bool text_iterator_next(Iterator*);
 bool text_iterator_prev(Iterator*);
 
+/* get byte at current iterator position, if this is at EOF a NUL
+ * byte (which is not actually part of the file) is read. */
 bool text_iterator_byte_get(Iterator*, char *b);
-bool text_iterator_byte_next(Iterator*, char *b);
+/* advance iterator by one byte and get byte at new position. */
 bool text_iterator_byte_prev(Iterator*, char *b);
+/* if the new position is at EOF a NUL byte (which is not actually
+ * part of the file) is read. */
+bool text_iterator_byte_next(Iterator*, char *b);
 
 bool text_iterator_char_next(Iterator*, char *c);
 bool text_iterator_char_prev(Iterator*, char *c);