* lib/quote.h, lib/quote.c, lib/quotearg.h, lib/quotearg.c:

* m4/prereq.m4, m4/c-bs-a.m4, m4/mbstate.m4:
New files, from Fileutils 4.0.27.
* src/main.c (printable_version): Remove.
* src/lex.c, src/reader.c: Use `quote'.


* lib/error.c, lib/error.h: New files, needed by xmalloc.c.

m4/prereq.m4

@@ -0,0 +1,14 @@
+#serial 1
+
+dnl These are the prerequisite macros for files in the lib/
+dnl directories of Bison.
+
+AC_DEFUN([jm_PREREQ_QUOTEARG],
+[
+  AC_CHECK_FUNCS(isascii iswprint mbrtowc)
+  AC_CHECK_HEADERS(limits.h stdlib.h string.h wchar.h wctype.h)
+  AC_HEADER_STDC
+  AC_C_BACKSLASH_A
+  AC_MBSTATE_T
+  AM_C_PROTOTYPES
+])