To libify `git apply` functionality we have to signal errors to the
caller instead of exit()ing.

To do that in a compatible manner with the rest of the error handling
in "builtin/apply.c", init_apply_state() should return -1 instead of
calling exit().

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 apply.c         | 11 ++++++-----
 apply.h         |  6 +++---
 builtin/apply.c |  3 ++-
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/apply.c b/apply.c
index c858ca4..6e0e992 100644
--- a/apply.c
+++ b/apply.c
@@ -55,9 +55,9 @@ int parse_ignorewhitespace_option(struct apply_state *state,
        return error(_("unrecognized whitespace ignore option '%s'"), option);
 }
 
-void init_apply_state(struct apply_state *state,
-                     const char *prefix,
-                     struct lock_file *lock_file)
+int init_apply_state(struct apply_state *state,
+                    const char *prefix,
+                    struct lock_file *lock_file)
 {
        memset(state, 0, sizeof(*state));
        state->prefix = prefix;
@@ -79,9 +79,10 @@ void init_apply_state(struct apply_state *state,
 
        git_apply_config();
        if (apply_default_whitespace && parse_whitespace_option(state, 
apply_default_whitespace))
-               exit(1);
+               return -1;
        if (apply_default_ignorewhitespace && 
parse_ignorewhitespace_option(state, apply_default_ignorewhitespace))
-               exit(1);
+               return -1;
+       return 0;
 }
 
 void clear_apply_state(struct apply_state *state)
diff --git a/apply.h b/apply.h
index 08c0a25..e18a18a 100644
--- a/apply.h
+++ b/apply.h
@@ -102,9 +102,9 @@ extern int parse_whitespace_option(struct apply_state 
*state,
 extern int parse_ignorewhitespace_option(struct apply_state *state,
                                         const char *option);
 
-extern void init_apply_state(struct apply_state *state,
-                            const char *prefix,
-                            struct lock_file *lock_file);
+extern int init_apply_state(struct apply_state *state,
+                           const char *prefix,
+                           struct lock_file *lock_file);
 extern void clear_apply_state(struct apply_state *state);
 
 #endif
diff --git a/builtin/apply.c b/builtin/apply.c
index bb6ff77..61fd316 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -4741,7 +4741,8 @@ int cmd_apply(int argc, const char **argv, const char 
*prefix)
                OPT_END()
        };
 
-       init_apply_state(&state, prefix, &lock_file);
+       if (init_apply_state(&state, prefix, &lock_file))
+               exit(128);
 
        argc = parse_options(argc, argv, state.prefix, builtin_apply_options,
                        apply_usage, 0);
-- 
2.10.0.41.g9df52c3

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