Handle multibyte mode line spec chars (bug#76517)

* src/xdisp.c (display_mode_element): Make 'c' an 'int'.  Use
'string_char_and_length' to fetch the character from a multibyte
string, not 'SREF'.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index b6d9094e684..adc0f4d7e0a 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -27755,7 +27755,7 @@ display_mode_element (struct it *it, int depth, int field_width, int precision,
     case Lisp_String:
       {
         /* A string: output it and check for %-constructs within it.  */
-        unsigned char c;
+        int c;
         ptrdiff_t offset = 0;
 
         if (SCHARS (elt) > 0
@@ -27926,6 +27926,15 @@ display_mode_element (struct it *it, int depth, int field_width, int precision,
                 while ((c = SREF (elt, offset++)) >= '0' && c <= '9')
                   field = field * 10 + c - '0';
 
+                /* "%" could be followed by a multibyte character.  */
+                if (STRING_MULTIBYTE (elt))
+                  {
+                    int length;
+                    offset--;
+                    c = string_char_and_length (SDATA (elt) + offset, &length);
+                    offset += length;
+                  }
+
                 /* Don't pad beyond the total padding allowed.  */
                 if (field_width - n > 0 && field > field_width - n)
                   field = field_width - n;