format-patch: extend --range-diff to accept revision range

diff --git a/line-range.c b/line-range.c
index de4e32f9424fbc0770756c3f61751fc69bfeb17e..232c3909ec27d3079e9228d0fcf561ce6a349754 100644 (file)
--- a/line-range.c
+++ b/line-range.c
@@ -47,7 +47,7 @@ static const char *parse_loc(const char *spec, nth_line_fn_t nth_line,
                        else if (!num)
                                *ret = begin;
                        else
-                               *ret = begin + num;
+                               *ret = begin + num > 0 ? begin + num : 1;
                        return term;
                }
                return spec;
@@ -269,8 +269,7 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
                return -1;
 
        if (*begin && *end && *end < *begin) {
-               long tmp;
-               tmp = *end; *end = *begin; *begin = tmp;
+               SWAP(*end, *begin);
        }
 
        return 0;