posix: add package

core/sys/posix/monetary.odin

@@ -0,0 +1,42 @@
+package posix
+
+import "core:c"
+
+when ODIN_OS == .Darwin {
+	foreign import lib "system:System.framework"
+} else {
+	foreign import lib "system:c"
+}
+
+// monetary.h - monetary types
+
+foreign lib {
+
+	/*
+	Places characters into the array pointed to by s as controlled by the string format.
+	No more than maxsize bytes are placed into the array.
+
+	Returns: -1 (setting errno) on failure, the number of bytes added to s otherwise
+
+	Example:
+		posix.setlocale(.ALL, "en_US.UTF-8")
+		value := 123456.789
+		buffer: [100]byte
+		size := posix.strfmon(raw_data(buffer[:]), len(buffer), "%n", value)
+		if int(size) == -1 {
+			fmt.panicf("strfmon failure: %s", posix.strerror(posix.errno()))
+		}
+		fmt.println(string(buffer[:size]))
+
+	Output:
+		$123,456.79
+
+	[[ More; https://pubs.opengroup.org/onlinepubs/9699919799/functions/strfmon.html ]]
+	*/
+	strfmon :: proc(
+		s:              [^]byte,
+		maxsize:        c.size_t,
+		format:         cstring,
+		#c_vararg args: ..any,
+	) -> c.size_t ---
+}