error: make git_errno more useful

Don't make git_errno static and add an argument to
git_error_print_stack. If this argument is NULL, it will print the
default stack; otherwise it will print the given stack.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

2 files changed, 7 insertions, 4 deletions

diff --git a/include/git2/errors.h b/include/git2/errors.h
index 3b306dcc8..db71fc2ef 100644
--- a/include/git2/errors.h
+++ b/include/git2/errors.h
@@ -148,7 +148,7 @@ GIT_EXTERN(void) git_error_free(git_error *err);
  * A bog standard stack trace. You can use it if you don't want to do
  * anything more complex in your UI.
  */
-GIT_EXTERN(void) git_error_print_stack(void);
+GIT_EXTERN(void) git_error_print_stack(git_error *error_in);
 
 /** @} */
 GIT_END_DECL
diff --git a/src/errors.c b/src/errors.c
index 34664ef55..923cb3507 100644
--- a/src/errors.c
+++ b/src/errors.c
@@ -13,7 +13,7 @@
 
 #include <stdarg.h>
 
-static GIT_TLS git_error *git_errno;
+GIT_TLS git_error *git_errno;
 
 static struct {
 	int num;
@@ -158,10 +158,13 @@ const char *git_lasterror(void)
 	return git_errno == NULL ? NULL : git_errno->msg;
 }
 
-void git_error_print_stack(void)
+void git_error_print_stack(git_error *error_in)
 {
 	git_error *error;
 
-	for (error = git_errno; error; error = error->child)
+	if (error_in == NULL)
+		error_in = git_errno;
+
+	for (error = error_in; error; error = error->child)
 		fprintf(stderr, "%s:%u %s\n", error->file, error->line, error->msg);
 }