error-handling: On-disk config file backend

Includes:

	- Proper error reporting when encountering syntax errors in a
	config file (file, line number, column).

	- Rewritten `config_write`, now with 99% less goto-spaghetti

	- Error state in `git_filebuf`: filebuf write functions no longer
	need to be checked for error returns. If any of the writes performed
	on a buffer fail, the last call to `git_filebuf_commit` or
	`git_filebuf_hash` will fail accordingly and set the appropiate error
	message. Baller!

1 files changed, 1 insertions, 6 deletions

diff --git a/include/git2/errors.h b/include/git2/errors.h
index bc420d1d..085dd52f 100644
--- a/include/git2/errors.h
+++ b/include/git2/errors.h
@@ -127,14 +127,9 @@ typedef enum {
 	GITERR_ZLIB,
 	GITERR_REPOSITORY,
 	GITERR_CONFIG,
+	GITERR_REGEX,
 } git_error_class;
 
-#define GITERR_CHECK_ALLOC(ptr) if (ptr == NULL) { return -1; }
-
-GIT_EXTERN(void) giterr_set_oom(void);
-GIT_EXTERN(void) giterr_set(int error_class, const char *string, ...);
-GIT_EXTERN(void) giterr_clear(void);
-
 /**
  * Return a detailed error string with the latest error
  * that occurred in the library.