thodg/libgit2

diff --git a/src/common.h b/src/common.h
index 03679fc..8a5761a 100644
--- a/src/common.h
+++ b/src/common.h
@@ -47,6 +47,7 @@
 # include <ws2tcpip.h>
 # include "win32/msvc-compat.h"
 # include "win32/mingw-compat.h"
+# include "win32/w32_common.h"
 # include "win32/win32-compat.h"
 # include "win32/error.h"
 # include "win32/version.h"
@@ -76,6 +77,7 @@
 
 #include "git2/types.h"
 #include "git2/errors.h"
+#include "errors.h"
 #include "thread-utils.h"
 #include "integer.h"
 
@@ -110,80 +112,6 @@
 	do { int _err = (code); if (_err) return _err; } while (0)
 
 /**
- * Set the error message for this thread, formatting as needed.
- */
-
-void git_error_set(int error_class, const char *string, ...) GIT_FORMAT_PRINTF(2, 3);
-
-/**
- * Set the error message for a regex failure, using the internal regex
- * error code lookup and return a libgit error code.
- */
-int git_error_set_regex(const p_regex_t *regex, int error_code);
-
-/**
- * Set error message for user callback if needed.
- *
- * If the error code in non-zero and no error message is set, this
- * sets a generic error message.
- *
- * @return This always returns the `error_code` parameter.
- */
-GIT_INLINE(int) git_error_set_after_callback_function(
-	int error_code, const char *action)
-{
-	if (error_code) {
-		const git_error *e = git_error_last();
-		if (!e || !e->message)
-			git_error_set(e ? e->klass : GIT_ERROR_CALLBACK,
-				"%s callback returned %d", action, error_code);
-	}
-	return error_code;
-}
-
-#ifdef GIT_WIN32
-#define git_error_set_after_callback(code) \
-	git_error_set_after_callback_function((code), __FUNCTION__)
-#else
-#define git_error_set_after_callback(code) \
-	git_error_set_after_callback_function((code), __func__)
-#endif
-
-/**
- * Gets the system error code for this thread.
- */
-int git_error_system_last(void);
-
-/**
- * Sets the system error code for this thread.
- */
-void git_error_system_set(int code);
-
-/**
- * Structure to preserve libgit2 error state
- */
-typedef struct {
-	int error_code;
-	unsigned int oom : 1;
-	git_error error_msg;
-} git_error_state;
-
-/**
- * Capture current error state to restore later, returning error code.
- * If `error_code` is zero, this does not clear the current error state.
- * You must either restore this error state, or free it.
- */
-extern int git_error_state_capture(git_error_state *state, int error_code);
-
-/**
- * Restore error state to a previous value, returning saved error code.
- */
-extern int git_error_state_restore(git_error_state *state);
-
-/** Free an error state. */
-extern void git_error_state_free(git_error_state *state);
-
-/**
  * Check a versioned structure for validity
  */
 GIT_INLINE(int) git_error__check_version(const void *structure, unsigned int expected_max, const char *name)
diff --git a/src/errors.h b/src/errors.h
new file mode 100644
index 0000000..f2af1e3
--- /dev/null
+++ b/src/errors.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_errors_h__
+#define INCLUDE_errors_h__
+
+#include "posix_regex.h"
+#include "common.h"
+
+/*
+ * Set the error message for this thread, formatting as needed.
+ */
+
+void git_error_set(int error_class, const char *string, ...) GIT_FORMAT_PRINTF(2, 3);
+
+/**
+ * Set the error message for a regex failure, using the internal regex
+ * error code lookup and return a libgit error code.
+ */
+int git_error_set_regex(const p_regex_t *regex, int error_code);
+
+/**
+ * Set error message for user callback if needed.
+ *
+ * If the error code in non-zero and no error message is set, this
+ * sets a generic error message.
+ *
+ * @return This always returns the `error_code` parameter.
+ */
+GIT_INLINE(int) git_error_set_after_callback_function(
+	int error_code, const char *action)
+{
+	if (error_code) {
+		const git_error *e = git_error_last();
+		if (!e || !e->message)
+			git_error_set(e ? e->klass : GIT_ERROR_CALLBACK,
+				"%s callback returned %d", action, error_code);
+	}
+	return error_code;
+}
+
+#ifdef GIT_WIN32
+#define git_error_set_after_callback(code) \
+	git_error_set_after_callback_function((code), __FUNCTION__)
+#else
+#define git_error_set_after_callback(code) \
+	git_error_set_after_callback_function((code), __func__)
+#endif
+
+/**
+ * Gets the system error code for this thread.
+ */
+int git_error_system_last(void);
+
+/**
+ * Sets the system error code for this thread.
+ */
+void git_error_system_set(int code);
+
+/**
+ * Structure to preserve libgit2 error state
+ */
+typedef struct {
+	int error_code;
+	unsigned int oom : 1;
+	git_error error_msg;
+} git_error_state;
+
+/**
+ * Capture current error state to restore later, returning error code.
+ * If `error_code` is zero, this does not clear the current error state.
+ * You must either restore this error state, or free it.
+ */
+extern int git_error_state_capture(git_error_state *state, int error_code);
+
+/**
+ * Restore error state to a previous value, returning saved error code.
+ */
+extern int git_error_state_restore(git_error_state *state);
+
+/** Free an error state. */
+extern void git_error_state_free(git_error_state *state);
+
+#endif
diff --git a/src/win32/path_w32.h b/src/win32/path_w32.h
index facbced..afd0aa1 100644
--- a/src/win32/path_w32.h
+++ b/src/win32/path_w32.h
@@ -8,37 +8,8 @@
 #define INCLUDE_win32_path_w32_h__
 
 #include "common.h"
-
 #include "vector.h"
 
-/*
- * Provides a large enough buffer to support Windows paths:  MAX_PATH is
- * 260, corresponding to a maximum path length of 259 characters plus a
- * NULL terminator.  Prefixing with "\\?\" adds 4 characters, but if the
- * original was a UNC path, then we turn "\\server\share" into
- * "\\?\UNC\server\share".  So we replace the first two characters with
- * 8 characters, a net gain of 6, so the maximum length is MAX_PATH+6.
- */
-#define GIT_WIN_PATH_UTF16		MAX_PATH+6
-
-/* Maximum size of a UTF-8 Win32 path.  We remove the "\\?\" or "\\?\UNC\"
- * prefixes for presentation, bringing us back to 259 (non-NULL)
- * characters.  UTF-8 does have 4-byte sequences, but they are encoded in
- * UTF-16 using surrogate pairs, which takes up the space of two characters.
- * Two characters in the range U+0800 -> U+FFFF take up more space in UTF-8
- * (6 bytes) than one surrogate pair (4 bytes).
- */
-#define GIT_WIN_PATH_UTF8		(259 * 3 + 1)
-
-/*
- * The length of a Windows "shortname", for 8.3 compatibility.
- */
-#define GIT_WIN_PATH_SHORTNAME  13
-
-/* Win32 path types */
-typedef wchar_t git_win32_path[GIT_WIN_PATH_UTF16];
-typedef char git_win32_utf8_path[GIT_WIN_PATH_UTF8];
-
 /**
  * Create a Win32 path (in UCS-2 format) from a UTF-8 string.
  *
diff --git a/src/win32/w32_common.h b/src/win32/w32_common.h
new file mode 100644
index 0000000..f9e74b9
--- /dev/null
+++ b/src/win32/w32_common.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_win32_w32_common_h__
+#define INCLUDE_win32_w32_common_h__
+
+/*
+ * Provides a large enough buffer to support Windows paths:  MAX_PATH is
+ * 260, corresponding to a maximum path length of 259 characters plus a
+ * NULL terminator.  Prefixing with "\\?\" adds 4 characters, but if the
+ * original was a UNC path, then we turn "\\server\share" into
+ * "\\?\UNC\server\share".  So we replace the first two characters with
+ * 8 characters, a net gain of 6, so the maximum length is MAX_PATH+6.
+ */
+#define GIT_WIN_PATH_UTF16		MAX_PATH+6
+
+/* Maximum size of a UTF-8 Win32 path.  We remove the "\\?\" or "\\?\UNC\"
+ * prefixes for presentation, bringing us back to 259 (non-NULL)
+ * characters.  UTF-8 does have 4-byte sequences, but they are encoded in
+ * UTF-16 using surrogate pairs, which takes up the space of two characters.
+ * Two characters in the range U+0800 -> U+FFFF take up more space in UTF-8
+ * (6 bytes) than one surrogate pair (4 bytes).
+ */
+#define GIT_WIN_PATH_UTF8		(259 * 3 + 1)
+
+/*
+ * The length of a Windows "shortname", for 8.3 compatibility.
+ */
+#define GIT_WIN_PATH_SHORTNAME  13
+
+/* Win32 path types */
+typedef wchar_t git_win32_path[GIT_WIN_PATH_UTF16];
+typedef char git_win32_utf8_path[GIT_WIN_PATH_UTF8];
+
+#endif