Integer overflow and signedness fixes (Bug#8873).

1 files changed, 5 insertions, 2 deletions

diff --git a/src/doc.c b/src/doc.c
index 89a7d322966..48e0936510b 100644
--- a/src/doc.c
+++ b/src/doc.c
@@ -253,9 +253,12 @@ get_doc_string (Lisp_Object filepos, int unibyte, int definition)
           else if (c == '_')
             *to++ = 037;
           else
-            error ("\
+            {
+              unsigned char uc = c;
+              error ("\
 Invalid data in documentation file -- %c followed by code %03o",
-                   1, (unsigned)c);
+                     1, uc);
+            }
         }
       else
         *to++ = *from++;