[Emacs-diffs] master 954c9c5: Check by eassert that a bytepos argument isn't in the middle of a character

[Alan Mackenzie]

branch: master
commit 954c9c5bc344cdd6b201c2260b306ec0999aff24
Author: Alan Mackenzie <address@hidden>
Commit: Alan Mackenzie <address@hidden>

    Check by eassert that a bytepos argument isn't in the middle of a character
    
    * src/marker.c (buf_bytepos_to_charpos): Add an eassert to check that the
    parameter bytepos is at the beginning of a character or EOB.
---
 src/marker.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/marker.c b/src/marker.c
index b58051a..0b2e1bf 100644
--- a/src/marker.c
+++ b/src/marker.c
@@ -332,6 +332,10 @@ buf_bytepos_to_charpos (struct buffer *b, ptrdiff_t 
bytepos)
   if (best_above == best_above_byte)
     return bytepos;
 
+  /* Check bytepos is not in the middle of a character. */
+  eassert (bytepos >= BUF_Z_BYTE (b)
+           || CHAR_HEAD_P (BUF_FETCH_BYTE (b, bytepos)));
+
   best_below = BEG;
   best_below_byte = BEG_BYTE;