tests: Fix undefined behaviour.

* tests/test2.c (main): Cast bytes to unsigned before shifting left.

2 files changed, 6 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 1667552..6c9d1d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2022-02-07  Bruno Haible  <bruno@clisp.org>
+
+	tests: Fix undefined behaviour.
+	* tests/test2.c (main): Cast bytes to unsigned before shifting left.
+
 2022-01-05  Bruno Haible  <bruno@clisp.org>
 
 	Release gperf-3.2.
diff --git a/tests/test2.c b/tests/test2.c
index c1c08cc..ecd3d18 100644
--- a/tests/test2.c
+++ b/tests/test2.c
@@ -45,7 +45,7 @@ main (int argc, char *argv[])
       char *p = buf;
       while (fread (p, 2, 1, stdin) == 1)
         {
-          if ((p[0] << 8) + p[1] == '\n')
+          if (((unsigned char) p[0] << 8) + (unsigned char) p[1] == '\n')
             break;
           p += 2;
         }