First arg is int, not unsigned.
* lib/quotearg.c (quotearg_n, quotearg_n_style): Likewise.
(SIZE_MAX, UINT_MAX): New macros.
(quotearg_n_options): Abort if N is negative.
Avoid overflow check on hosts where size_t is 64 bits and int
is 32 bits, as overflow is impossible there.
Fix off-by-one typo that caused unnecessary reallocation.
* lib/quotearg.c: BSD/OS 4.1 wchar.h requires FILE and struct
tm to be declared.
(HAVE_MBSINIT): Undef if !HAVE_MBRTOWC.
(mbsinit): Define to 1 if !defined mbsinit && !HAVE_MBSINIT.
* m4/Makefile.am (EXTRA_DIST): Add mbrtowc.m4.
* m4/mbrtowc.m4: New file.
* m4/prereq.m4 (jm_PREREQ_QUOTEARG): Check for mbsinit and stddef.h.
Use jm_FUNC_MBRTOWC instead of AC_CHECK_FUNCS(mbrtowc).
