t9300: factor out portable "head -c" replacement

diff --git a/diff.h b/diff.h
index e7d68edaf9d4744ce3c48356e1835c5506d5322d..125447be09ebf1d79beb7312785c2e89654fbdb0 100644 (file)
--- a/diff.h
+++ b/diff.h
@@ -266,6 +266,7 @@ extern int parse_long_opt(const char *opt, const char **argv,
                         const char **optarg);
 
 extern int git_diff_basic_config(const char *var, const char *value, void *cb);
+extern void init_diff_ui_defaults(void);
 extern int git_diff_ui_config(const char *var, const char *value, void *cb);
 extern void diff_setup(struct diff_options *);
 extern int diff_opt_parse(struct diff_options *, const char **, int, const char *);