correctly parse size

[chiark-utils.git] / cprogs / rwbuffer.c

diff --git a/cprogs/rwbuffer.c b/cprogs/rwbuffer.c
index ee97fca6bac443802b18194127bc58e42822fc9b..10b86ca0d1ec8e2d268ab9fe68aef1e2465cef54 100644 (file)
--- a/cprogs/rwbuffer.c
+++ b/cprogs/rwbuffer.c
@@ -100,7 +100,7 @@ void startup(const char *const *argv) {
       case 'b':          shift= 0;   break;
       default: usageerr("buffer size unit unknown");
       }
-      if (buffersize > (RWBUFFER_SIZE_MB_MAX >> shift))
+      if (buffersize > ((RWBUFFER_SIZE_MB_MAX << 20) >> shift))
        usageerr("buffer size too big");
       buffersize <<= shift;
     } else {