Avoid using expr in tests with ulong as its argument.

* configure.ac (MU_ULONG_MAX): Rename to MU_ULONG_MAX_1,
decrease by one accordingly.
* imap4d/tests/IDEF0955.at: Use MU_ULONG_MAX_1 instead of
calling expr.
* imap4d/tests/IDEF0956.at: Likewise.
* imap4d/tests/atlocal.in: Define MU_ULONG_MAX_1.

@@ -643,7 +643,7 @@ AC_CHECK_TYPE(socklen_t, , AC_DEFINE(socklen_t, int, [Define to int if <sys/type
 AC_CHECK_TYPE(long long, , AC_DEFINE(LONG_LONG, long, [Define to long if compiler does not support]))
 AC_CHECK_TYPE(long double, , AC_DEFINE(LONG_DOUBLE, double, [Define to double if compiler does not support]))
 
-AC_SUBST(MU_ULONG_MAX)
+AC_SUBST(MU_ULONG_MAX_1)
 AC_RUN_IFELSE([AC_LANG_PROGRAM(
 [#include <stdio.h>
 #include <stdlib.h>
@@ -652,13 +652,13 @@ AC_RUN_IFELSE([AC_LANG_PROGRAM(
  FILE *f = fopen ("conftest.val", "w");
  if (! f)
     exit (1);
- fprintf(f, "%lu\n", ULONG_MAX);
+ fprintf(f, "%lu\n", ULONG_MAX-1);
  fclose(f);
  return 0;]
 )],
- [MU_ULONG_MAX=`cat conftest.val`],
- [MU_ULONG_MAX=0],
- [MU_ULONG_MAX=0])
+ [MU_ULONG_MAX_1=`cat conftest.val`],
+ [MU_ULONG_MAX_1=0],
+ [MU_ULONG_MAX_1=0])
 
 AC_STRUCT_TM
 AC_CHECK_MEMBERS([struct tm.tm_zone, struct tm.tm_gmtoff, struct tm.tm_isdst],

@@ -17,12 +17,12 @@
 AT_SETUP([IDEF0955])
 
 AT_CHECK([
-limit=`expr $MU_ULONG_MAX - 1`
+test $MU_ULONG_MAX_1 -eq 0 && AT_SKIP_TEST
 
 cat > input <<EOT
 1 select INBOX
-2 FETCH 1:$limit FLAGS
-3 UID FETCH 1:$limit FLAGS
+2 FETCH 1:$MU_ULONG_MAX_1 FLAGS
+3 UID FETCH 1:$MU_ULONG_MAX_1 FLAGS
 X LOGOUT
 EOT
 

@@ -17,11 +17,11 @@
 AT_SETUP([IDEF0956])
 
 AT_CHECK([
-limit=`expr $MU_ULONG_MAX - 1`
+test $MU_ULONG_MAX_1 -eq 0 && AT_SKIP_TEST
 
 cat > input <<EOT
 1 select INBOX
-2 FETCH 1 BODY[[TEXT]]<0.$limit>
+2 FETCH 1 BODY[[TEXT]]<0.$MU_ULONG_MAX_1>
 X LOGOUT
 EOT
 

@@ -3,7 +3,7 @@
 # Copyright (C) 2011-2012 Free Software Foundation, Inc.
 
 PATH=@abs_builddir@:@abs_top_builddir@/imap4d:$top_srcdir:$srcdir:$PATH
-MU_ULONG_MAX=@MU_ULONG_MAX@
+MU_ULONG_MAX_1=@MU_ULONG_MAX_1@
 
 remove_untagged() {
   sed '/^\*/d'