sys/posix: impl rest of linux, impl some of Windows

core/c/libc/README.md

@@ -14,7 +14,7 @@ The following is a mostly-complete projection of the C11 standard library as def
 | `<inttypes.h>`    | Fully projected                                    |
 | `<iso646.h>`      | Not applicable, use Odin's operators               |
 | `<limits.h>`      | Not projected                                      |
-| `<locale.h>`      | Not projected                                      |
+| `<locale.h>`      | Fully projected                                    |
 | `<math.h>`        | Mostly projected, see [limitations](#Limitations)  |
 | `<setjmp.h>`      | Fully projected                                    |
 | `<signal.h>`      | Fully projected                                    |
@@ -70,4 +70,4 @@ with the following copyright.
 
 ```
 Copyright 2021 Dale Weiler <weilercdale@gmail.com>.
-```
+```

core/c/libc/locale.odin

@@ -0,0 +1,133 @@
+package libc
+
+import "core:c"
+
+when ODIN_OS == .Windows {
+	foreign import libc "system:libucrt.lib"
+} else when ODIN_OS == .Darwin {
+	foreign import libc "system:System.framework"
+} else {
+	foreign import libc "system:c"
+}
+
+// locale.h - category macros
+
+foreign libc {
+	/*
+	Sets the components of an object with the type lconv with the values appropriate for the
+	formatting of numeric quantities (monetary and otherwise) according to the rules of the current
+	locale.
+
+	Returns: a pointer to the lconv structure, might be invalidated by subsequent calls to localeconv() and setlocale()
+
+	[[ More; https://pubs.opengroup.org/onlinepubs/9699919799/functions/localeconv.html ]]
+	*/
+	localeconv :: proc() -> ^lconv ---
+
+	/*
+	Selects the appropriate piece of the global locale, as specified by the category and locale arguments,
+	and can be used to change or query the entire global locale or portions thereof.
+
+	Returns: the current locale if `locale` is `nil`, the set locale otherwise
+
+	[[ More; https://pubs.opengroup.org/onlinepubs/9699919799/functions/setlocale.html ]]
+	*/
+	@(link_name=LSETLOCALE)
+	setlocale :: proc(category: Locale_Category, locale: cstring) -> cstring ---
+}
+
+Locale_Category :: enum c.int {
+	ALL      = LC_ALL,
+	COLLATE  = LC_COLLATE,
+	CTYPE    = LC_CTYPE,
+	MESSAGES = LC_MESSAGES,
+	MONETARY = LC_MONETARY,
+	NUMERIC  = LC_NUMERIC,
+	TIME     = LC_TIME,
+}
+
+when ODIN_OS == .NetBSD {
+	@(private) LSETLOCALE :: "__setlocale50"
+} else {
+	@(private) LSETLOCALE :: "setlocale"
+}
+
+when ODIN_OS == .Windows {
+	lconv :: struct {
+		decimal_point:        cstring,
+		thousand_sep:         cstring,
+		grouping:             cstring,
+		int_curr_symbol:      cstring,
+		currency_symbol:      cstring,
+		mon_decimal_points:   cstring,
+		mon_thousands_sep:    cstring,
+		mon_grouping:         cstring,
+		positive_sign:        cstring,
+		negative_sign:        cstring,
+		int_frac_digits:      c.char,
+		frac_digits:          c.char,
+		p_cs_precedes:        c.char,
+		p_sep_by_space:       c.char,
+		n_cs_precedes:        c.char,
+		n_sep_by_space:       c.char,
+		p_sign_posn:          c.char,
+		n_sign_posn:          c.char,
+		_W_decimal_point:     [^]u16 `fmt:"s,0"`,
+		_W_thousands_sep:     [^]u16 `fmt:"s,0"`,
+		_W_int_curr_symbol:   [^]u16 `fmt:"s,0"`,
+		_W_currency_symbol:   [^]u16 `fmt:"s,0"`,
+		_W_mon_decimal_point: [^]u16 `fmt:"s,0"`,
+		_W_mon_thousands_sep: [^]u16 `fmt:"s,0"`,
+		_W_positive_sign:     [^]u16 `fmt:"s,0"`,
+		_W_negative_sign:     [^]u16 `fmt:"s,0"`,
+	}
+} else {
+	lconv :: struct {
+		decimal_point:       cstring,
+		thousand_sep:        cstring,
+		grouping:            cstring,
+		int_curr_symbol:     cstring,
+		currency_symbol:     cstring,
+		mon_decimal_points:  cstring,
+		mon_thousands_sep:   cstring,
+		mon_grouping:        cstring,
+		positive_sign:       cstring,
+		negative_sign:       cstring,
+		int_frac_digits:     c.char,
+		frac_digits:         c.char,
+		p_cs_precedes:       c.char,
+		p_sep_by_space:      c.char,
+		n_cs_precedes:       c.char,
+		n_sep_by_space:      c.char,
+		p_sign_posn:         c.char,
+		n_sign_posn:         c.char,
+		_int_p_cs_precedes:  c.char,
+		_int_n_cs_precedes:  c.char,
+		_int_p_sep_by_space: c.char,
+		_int_n_sep_by_space: c.char,
+		_int_p_sign_posn:    c.char,
+		_int_n_sign_posn:    c.char,
+	}
+}
+
+when ODIN_OS == .Darwin || ODIN_OS == .FreeBSD || ODIN_OS == .NetBSD  || ODIN_OS == .OpenBSD || ODIN_OS == .Windows {
+
+	LC_ALL      :: 0
+	LC_COLLATE  :: 1
+	LC_CTYPE    :: 2
+	LC_MESSAGES :: 6
+	LC_MONETARY :: 3
+	LC_NUMERIC  :: 4
+	LC_TIME     :: 5
+
+} else when ODIN_OS == .Linux {
+
+	LC_CTYPE    :: 0
+	LC_NUMERIC  :: 1
+	LC_TIME     :: 2
+	LC_COLLATE  :: 3
+	LC_MONETARY :: 4
+	LC_MESSAGES :: 5
+	LC_ALL      :: 6
+
+}