build-sys: add NLS support

Add GNU gettext internationalization and localization support.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

include/nls.h

@@ -0,0 +1,106 @@
+#ifndef PROCPS_NG_NLS_H
+#define PROCPS_NG_NLS_H
+
+#ifndef LOCALEDIR
+#define LOCALEDIR "/usr/share/locale"
+#endif
+
+#ifdef HAVE_LOCALE_H
+# include <locale.h>
+#else
+# undef setlocale
+# define setlocale(Category, Locale) /* empty */
+#endif
+
+#ifdef ENABLE_NLS
+# include <libintl.h>
+# define _(Text) gettext (Text)
+# ifdef gettext_noop
+#  define N_(String) gettext_noop (String)
+# else
+#  define N_(String) (String)
+# endif
+# define P_(Singular, Plural, n) ngettext (Singular, Plural, n)
+#else
+# undef bindtextdomain
+# define bindtextdomain(Domain, Directory) /* empty */
+# undef textdomain
+# define textdomain(Domain) /* empty */
+# define _(Text) (Text)
+# define N_(Text) (Text)
+# define P_(Singular, Plural, n) ((n) == 1 ? (Singular) : (Plural))
+#endif /* ENABLE_NLS */
+
+#ifdef HAVE_LANGINFO_H
+# include <langinfo.h>
+#else
+
+typedef int nl_item;
+extern char *langinfo_fallback(nl_item item);
+
+# define nl_langinfo	langinfo_fallback
+
+enum {
+	CODESET = 1,
+	RADIXCHAR,
+	THOUSEP,
+	D_T_FMT,
+	D_FMT,
+	T_FMT,
+	T_FMT_AMPM,
+	AM_STR,
+	PM_STR,
+
+	DAY_1,
+	DAY_2,
+	DAY_3,
+	DAY_4,
+	DAY_5,
+	DAY_6,
+	DAY_7,
+
+	ABDAY_1,
+	ABDAY_2,
+	ABDAY_3,
+	ABDAY_4,
+	ABDAY_5,
+	ABDAY_6,
+	ABDAY_7,
+
+	MON_1,
+	MON_2,
+	MON_3,
+	MON_4,
+	MON_5,
+	MON_6,
+	MON_7,
+	MON_8,
+	MON_9,
+	MON_10,
+	MON_11,
+	MON_12,
+
+	ABMON_1,
+	ABMON_2,
+	ABMON_3,
+	ABMON_4,
+	ABMON_5,
+	ABMON_6,
+	ABMON_7,
+	ABMON_8,
+	ABMON_9,
+	ABMON_10,
+	ABMON_11,
+	ABMON_12,
+
+	ERA_D_FMT,
+	ERA_D_T_FMT,
+	ERA_T_FMT,
+	ALT_DIGITS,
+	CRNCYSTR,
+	YESEXPR,
+	NOEXPR
+};
+
+#endif /* !HAVE_LANGINFO_H */
+#endif /* PROCPS_NG_NLS_H */