Let's make it possible to get the current error_routine and warn_routine,
so that we can store them before using set_error_routine() or
set_warn_routine() to use new ones.

This way we will be able put back the original routines, when we are done
with using new ones.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
 git-compat-util.h |  2 ++
 usage.c           | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/git-compat-util.h b/git-compat-util.h
index c7a51f8..de04df1 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -440,7 +440,9 @@ static inline int const_error(void)
 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, 
va_list params));
 extern void set_error_routine(void (*routine)(const char *err, va_list 
+extern void (*get_error_routine(void))(const char *err, va_list params);
 extern void set_warn_routine(void (*routine)(const char *warn, va_list 
+extern void (*get_warn_routine(void))(const char *warn, va_list params);
 extern void set_die_is_recursing_routine(int (*routine)(void));
 extern void set_error_handle(FILE *);
diff --git a/usage.c b/usage.c
index 67e5526..2fd3045 100644
--- a/usage.c
+++ b/usage.c
@@ -70,11 +70,21 @@ void set_error_routine(void (*routine)(const char *err, 
va_list params))
        error_routine = routine;
+void (*get_error_routine(void))(const char *err, va_list params)
+       return error_routine;
 void set_warn_routine(void (*routine)(const char *warn, va_list params))
        warn_routine = routine;
+void (*get_warn_routine(void))(const char *warn, va_list params)
+       return warn_routine;
 void set_die_is_recursing_routine(int (*routine)(void))
        die_is_recursing = routine;

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