[PATCH v8 39/41] apply: change error_routine when be_silent is set

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To avoid printing anything when applying with be_silent set,
let's save the existing warn and error routines before
applying and replace them with a routine that does nothing.

Then after applying, let's restore the saved routines.

Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
---
 apply.c | 21 ++++++++++++++++++++-
 apply.h |  4 ++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/apply.c b/apply.c
index e2acc18..de86f40 100644
--- a/apply.c
+++ b/apply.c
@@ -109,6 +109,11 @@ void clear_apply_state(struct apply_state *state)
 	/* &state->fn_table is cleared at the end of apply_patch() */
 }
 
+static void mute_routine(const char *bla, va_list params)
+{
+	/* do nothing */
+}
+
 int check_apply_state(struct apply_state *state, int force_apply)
 {
 	int is_not_gitdir = !startup_info->have_repository;
@@ -143,6 +148,13 @@ int check_apply_state(struct apply_state *state, int force_apply)
 	if (!state->lock_file)
 		return error("BUG: state->lock_file should not be NULL");
 
+	if (state->be_silent) {
+		state->saved_error_routine = get_error_routine();
+		state->saved_warn_routine = get_warn_routine();
+		set_error_routine(mute_routine);
+		set_warn_routine(mute_routine);
+	}
+
 	return 0;
 }
 
@@ -4860,7 +4872,7 @@ int apply_all_patches(struct apply_state *state,
 		state->newfd = -1;
 	}
 
-	return !!errs;
+	res = !!errs;
 
 end:
 	if (state->newfd >= 0) {
@@ -4868,5 +4880,12 @@ end:
 		state->newfd = -1;
 	}
 
+	if (state->be_silent) {
+		set_error_routine(state->saved_error_routine);
+		set_warn_routine(state->saved_warn_routine);
+	}
+
+	if (res > -1)
+		return res;
 	return (res == -1 ? 1 : 128);
 }
diff --git a/apply.h b/apply.h
index 44bed19..51a930a 100644
--- a/apply.h
+++ b/apply.h
@@ -89,6 +89,10 @@ struct apply_state {
 	 */
 	struct string_list fn_table;
 
+	/* This is to save some reporting routines */
+	void (*saved_error_routine)(const char *err, va_list params);
+	void (*saved_warn_routine)(const char *warn, va_list params);
+
 	/* These control whitespace errors */
 	enum apply_ws_error_action ws_error_action;
 	enum apply_ws_ignore ws_ignore_action;
-- 
2.9.0.172.gfb57a78

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