1 files changed, 66 insertions, 0 deletions
diff --git a/include/git2/sys/errors.h b/include/git2/sys/errors.h
new file mode 100644
index 0000000..3ae1215
--- /dev/null
+++ b/include/git2/sys/errors.h
@@ -0,0 +1,66 @@
+/*
+ * 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_sys_git_errors_h__
+#define INCLUDE_sys_git_errors_h__
+
+#include "git2/common.h"
+
+GIT_BEGIN_DECL
+
+/**
+ * Clear the last library error that occurred for this thread.
+ */
+GIT_EXTERN(void) git_error_clear(void);
+
+/**
+ * Set the error message string for this thread, using `printf`-style
+ * formatting.
+ *
+ * This function is public so that custom ODB backends and the like can
+ * relay an error message through libgit2.  Most regular users of libgit2
+ * will never need to call this function -- actually, calling it in most
+ * circumstances (for example, calling from within a callback function)
+ * will just end up having the value overwritten by libgit2 internals.
+ *
+ * This error message is stored in thread-local storage and only applies
+ * to the particular thread that this libgit2 call is made from.
+ *
+ * @param error_class One of the `git_error_t` enum above describing the
+ *                    general subsystem that is responsible for the error.
+ * @param fmt The `printf`-style format string; subsequent arguments must
+ *            be the arguments for the format string.
+ */
+GIT_EXTERN(void) git_error_set(int error_class, const char *fmt, ...)
+                 GIT_FORMAT_PRINTF(2, 3);
+
+/**
+ * Set the error message string for this thread.  This function is like
+ * `git_error_set` but takes a static string instead of a `printf`-style
+ * format.
+ *
+ * @param error_class One of the `git_error_t` enum above describing the
+ *                    general subsystem that is responsible for the error.
+ * @param string The error message to keep
+ * @return 0 on success or -1 on failure
+ */
+GIT_EXTERN(int) git_error_set_str(int error_class, const char *string);
+
+/**
+ * Set the error message to a special value for memory allocation failure.
+ *
+ * The normal `git_error_set_str()` function attempts to `strdup()` the
+ * string that is passed in.  This is not a good idea when the error in
+ * question is a memory allocation failure.  That circumstance has a
+ * special setter function that sets the error string to a known and
+ * statically allocated internal value.
+ */
+GIT_EXTERN(void) git_error_set_oom(void);
+
+GIT_END_DECL
+
+#endif