1 files changed, 2 insertions, 3 deletions

diff --git a/src/doc.c b/src/doc.c
index fa2eca66a1d..7234fb38bf9 100644
--- a/src/doc.c
+++ b/src/doc.c
@@ -630,11 +630,10 @@ the same file name is found in the `doc-directory'.  */)
         break;
 
       buf[filled] = 0;
-      p = buf;
       end = buf + (filled < 512 ? filled : filled - 128);
-      while (p != end && *p != '\037') p++;
+      p = memchr (buf, '\037', end - buf);
       /* p points to ^_Ffunctionname\n or ^_Vvarname\n or ^_Sfilename\n.  */
-      if (p != end)
+      if (p)
         {
           end = strchr (p, '\n');