Split up os.h, inline functions and fix some typos

1 files changed, 100 insertions, 0 deletions

diff --git a/src/os-win32.h b/src/os-win32.h
new file mode 100644
index 0000000..51d2dc2
--- /dev/null
+++ b/src/os-win32.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* Windows-specific definitions for os.h - don't include this directly! */
+
+#define IMPORT __declspec(dllimport) // only needed for variables
+#define EXPORT __declspec(dllexport)
+
+typedef unsigned short os_char;
+#define _OS_CAT(L, x) L##x
+#define OS_LIT(x) _OS_CAT(L, x)
+
+#define os_snprintf _snwprintf
+#define os_strchr wcschr
+#define os_strcmp wcscmp
+#define os_strcpy wcscpy
+#define os_strlen wcslen
+#define strncasecmp _strnicmp // stupid!
+
+#define os_fopen _wfopen
+// yuck :(
+#define _os_open3(path, flags, mode) _wopen((path), (flags) | _O_BINARY, (mode))
+#define _os_open2(path, flags) _wopen((path), (flags) | _O_BINARY)
+#define _os_open(a, b, c, x, ...) x
+#define os_open(...) _os_open(__VA_ARGS__, _os_open3, _os_open2, _)(__VA_ARGS__)
+#define os_access _waccess
+// ucrt defines __stat64 to _stat64. we want _wstat64 to be the actual function
+#define _stat64(path, buf) _wstat64(path, buf)
+#define os_stat _stat64
+#define os_getenv _wgetenv
+
+#define OS_DLSUFFIX ".dll"
+
+#define OS_MAIN wmain
+
+static inline void *os_dlsym(void *m, const char *s) {
+	return (void *)GetProcAddress(m, s);
+}
+
+static inline bool os_mprot(void *addr, int len, int fl) {
+	unsigned long old;
+	return !!VirtualProtect(addr, len, fl, &old);
+}
+
+// SystemFunction036 is the *real* name of "RtlGenRandom," and is also
+// incorrectly defined in system headers. Yay.
+int __stdcall SystemFunction036(void *buf, unsigned long sz);
+
+static inline void os_randombytes(void *buf, int sz) {
+	// if this call fails, the system is doomed, so loop until success and pray.
+	while (!SystemFunction036(buf, sz));
+}
+
+/* Further Windows-specific workarounds because Windows is great */
+
+#ifndef PATH_MAX
+// XXX: win32/crt has this dumb 260 limit even though the actual kernel imposes
+// no limit (though apparently NTFS has a limit of 65535). Theoerically we could
+// do some memes with UNC paths to extend it to at least have parity with Unix
+// PATH_MAX (4096), but for now we just kind of accept that Windows is a
+// disaster.
+#define PATH_MAX MAX_PATH
+#endif
+
+// why does Windows prefix so many things with underscores?
+#define alloca _alloca
+#define read _read
+#define write _write
+#define close _close
+#define O_RDONLY _O_RDONLY
+#define O_RDWR _O_RDWR
+#define O_CLOEXEC _O_NOINHERIT // and why did they rename this!?
+#define O_CREAT _O_CREAT
+#define O_EXCL _O_EXCL
+// missing access() flags
+#define F_OK 0
+#define R_OK 4
+#define W_OK 2
+#define X_OK R_OK // there's no actual X bit, just pretend
+
+// just dump this boilerplate here as well, I spose
+#define OS_WINDOWS_ERROR(arrayname) \
+	FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, 0, GetLastError(), \
+			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), arrayname, \
+			sizeof(arrayname), 0)
+
+// vi: sw=4 ts=4 noet tw=80 cc=80