describe: when failing, tell the user about options that work

diff --git a/xdiff-interface.c b/xdiff-interface.c
index d782f06d9916bdde33dc3f7312f9eac4e14ef3a1..01f14fb50f7cf1387898a0c8db44f966ce07b720 100644 (file)
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -15,11 +15,10 @@ static int parse_num(char **cp_p, int *num_p)
 {
        char *cp = *cp_p;
        int num = 0;
-       int read_some;
 
        while ('0' <= *cp && *cp <= '9')
                num = num * 10 + *cp++ - '0';
-       if (!(read_some = cp - *cp_p))
+       if (!(cp - *cp_p))
                return -1;
        *cp_p = cp;
        *num_p = num;
@@ -310,6 +309,21 @@ void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value, int cflags)
        }
 }
 
+void xdiff_clear_find_func(xdemitconf_t *xecfg)
+{
+       if (xecfg->find_func) {
+               int i;
+               struct ff_regs *regs = xecfg->find_func_priv;
+
+               for (i = 0; i < regs->nr; i++)
+                       regfree(&regs->array[i].re);
+               free(regs->array);
+               free(regs);
+               xecfg->find_func = NULL;
+               xecfg->find_func_priv = NULL;
+       }
+}
+
 int git_xmerge_style = -1;
 
 int git_xmerge_config(const char *var, const char *value, void *cb)