"rebase -i": support special-purpose editor to edit insn sheet

diff --git a/quote.c b/quote.c
index 63d3b018183abc05a5231dfd7e134dd7394f7a9b..532fd3b7b7a0c7b6766a7af742b0c7362f307221 100644 (file)
--- a/quote.c
+++ b/quote.c
@@ -325,8 +325,12 @@ static const char *path_relative(const char *in, int len,
 
        if (len < 0)
                len = strlen(in);
-       if (prefix && prefix_len < 0)
-               prefix_len = strlen(prefix);
+       if (prefix_len < 0) {
+               if (prefix)
+                       prefix_len = strlen(prefix);
+               else
+                       prefix_len = 0;
+       }
 
        off = 0;
        i = 0;