version to string functions `v_ctos{s,n,}()` working as intended

TODO: Move them out of header and into seperate TU "version.c"

version_t holds version components. `v_rawtoc()`, `v_ctoraw()` to create from/convert to the format used by `VERSION()` macro and friends. Punning this union between the raw (u32, used by the macros) and the componant struct (`v_comp`) is possible on little endian machines but discouraged.

Fortune for naka's current commit: Half blessing − 半吉

include/macros.h

@@ -37,6 +37,16 @@
 #define restrict __restrict__
 #endif
 
+// Argument attribute
+
+// Used like: `int *pOUT output, const int *pIN input`
+#define pOUT restrict
+#define pIN const restrict
+
+// Used like: `int _OUT output, const int _IN input`
+#define _IN *pIN
+#define _OUT *pOUT
+
 // Type macros
 
 #define AS(x, t) ((t)(x))
@@ -155,9 +165,9 @@ static_assert_eq(bswap(bswap(128lu)), 128, "bswap128 (lu) failed (3)");
 #define VERSION_COMP(ver, mask) _AS_u32( _AS_u32(ver) & (0xffu << _AS_u32(mask)) /*>> _AS_u32(mask)*/ )
 
 #define VERSION_MAJ(ver) _AS_u32(VERSION_COMP((ver), 24u) >> 24u)
-#define VERSINO_MIN(ver) _AS_u32(VERSION_COMP((ver), 16u) >> 16u)
-#define VERSINO_BF(ver)  _AS_u32(VERSION_COMP((ver), 8u) >> 8u)
-#define VERSINO_REV(ver) _AS_u32(_AS_u32(ver) & 0xffu)
+#define VERSION_MIN(ver) _AS_u32(VERSION_COMP((ver), 16u) >> 16u)
+#define VERSION_BF(ver)  _AS_u32(VERSION_COMP((ver), 8u) >> 8u)
+#define VERSION_REV(ver) _AS_u32(_AS_u32(ver) & 0xffu)
 _Static_assert( (VERSION_COMP(VERSION(1,2,3,4), VER_COMP_MIN) >> VER_COMP_MIN) == 2u, "invalid native version spec");
 
 #endif /* _MACROS_H */

include/version.h

@@ -0,0 +1,79 @@
+#ifndef _VERSION_H
+#define _VERSION_H
+
+#include "macros.h"
+#include "ints.h"
+
+typedef union {
+	uint32_t raw;
+	// XXX: Punning through this union is unsafe, it may work (on little endian machines), but it is not intended to be punned. Use `v_rawtoc` and `v_ctoraw` instead.
+	struct v_comp {
+		u8 revision, bugfix, minor, major;
+	} comp;
+} version_t;
+
+// Convert a native `u32` representation of a version (the output of `VERSION()` macro) to a `version_t`.
+#define v_rawtoc_unsafe(raw) ((version_t){ .raw = (raw) })
+_mixin version_t v_rawtoc(uint32_t raw)
+{
+	register version_t out = {
+		.comp = {
+			.major = VERSION_MAJ(raw),
+			.minor = VERSION_MIN(raw),
+			.bugfix = VERSION_BF(raw),
+			.revision = VERSION_REV(raw),
+		},
+	};
+	return out;
+}
+
+/// Convert a `version_t` to its native `u32` representation.
+#define v_ctoraw_unsafe(ver) ((ver).raw)
+_mixin uint32_t v_ctoraw(version_t ver)
+{
+	return VERSION(ver.comp.major,
+			ver.comp.minor,
+			ver.comp.bugfix,
+			ver.comp.revision);
+}
+
+#define VERSION_C(ma,mi,bf,re) v_rawtoc(VERSION((ma),(mi),(bf),(re)))
+
+#define VERSION_STRING_MAX AS(3 + 3 + 3 + 3 + 3, usize) // maj + min + bf + rev + (..r)
+
+//TODO: Move the below functions to `version.c` and have them prototyped, not mixins.
+
+/// Print a version to a string buffer `out`. Return the number of bytes written.
+///
+/// Has the same semantics as `snprintf`; to calculate the length of the string needed to allocate, invoke like: `size_t sz = v_ctosn(vers, 0, NULL)`. The buffer should be allocated as `sz + 1`, and then the next call to `v_ctosn` should be like: `v_ctosn(vers, sz+1, buffer);
+_mixin usize v_ctosn(version_t ver, usize max, char out[static pOUT max])
+{
+	struct v_comp comp = ver.comp;
+	const char* const fmt = comp.revision ? "%hhu.%hhu.%hhur%hhu" : "%hhu.%hhu.%hhu";
+
+	
+	return snprintf(out, max, fmt, 
+			comp.major,
+			comp.minor,
+			comp.bugfix,
+			comp.revision);
+}
+
+/// Print a version to  a static string buffer. The string buffer is thread local. The next call to this function on the same thread will overwrite the returned buffer.
+_mixin const char* v_ctoss(version_t ver)
+{
+	_Thread_local static char buffer[VERSION_STRING_MAX+1];
+	buffer[v_ctosn(ver, VERSION_STRING_MAX+1, buffer)] = 0;
+	return buffer;
+}
+
+/// Print a version to a `malloc()`d string buffer. The buffer is unique and owned by the callee. The buffer must be `free()`d.
+_mixin char* v_ctos(version_t ver)
+{
+	usize sz = v_ctosn(ver, 0, NULL);
+	char* buf = malloc(sz+1);
+	v_ctosn(ver, sz+1, buf);
+	return buf;
+}
+
+#endif /* _VERSION_H */

src/main.c

@@ -6,17 +6,28 @@
 
 #include <ints.h>
 #include <macros.h>
+#include <version.h>
 
 int main(int argc, char** argv)
 {
 	IGNORE(argc);
 	IGNORE(argv);
 
-	u64 i = 128;
+	const u32 vraw = VERSION(1,2,3,240);
+	version_t vers = v_rawtoc(vraw);
 
-	u32 vers = VERSION(1,2,3,4);
+	usize sz = v_ctosn(vers, 0, NULL);
+	char verstr[sz+1];
+	v_ctosn(vers, sz+1, verstr);
 
-	INFO("Hello world %lu %lu %lu!", i, bswap(i), bswap(bswap(i)));
+	char* verstr_h;
+	INFO("Version: 0x%x, raw: 0x%x", vers.raw, vraw);
+	INFO("Output is: (%lu chars)\t%s", sz, verstr);
+	INFO("Output is (static):\t%s", v_ctoss(vers));
+	INFO("Output is (leak):\t\t%s", (verstr_h = v_ctos(vers)));
+	
+	free(verstr_h);
+	//INFO("Hello world %lu %lu %lu!", i, bswap(i), bswap(bswap(i)));
 	//INFO("Version: 0x%x (0x%x)", vers, bswap(vers)); // Check which version endian was preferrable, we'll stick with the default system endian (little, for this one.)
 	return 0;
 }