Introduce usagef() that takes a printf-style format

diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 4625c1b4215231dc343478b2f4f7b4bfccf2c766..c4bedf0d1ce1252563d7f36da7d846f5943343b0 100644 (file)
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -59,9 +59,10 @@ static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *
  */
 xdchange_t *xdl_get_hunk(xdchange_t *xscr, xdemitconf_t const *xecfg) {
        xdchange_t *xch, *xchp;
+       long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
 
        for (xchp = xscr, xch = xscr->next; xch; xchp = xch, xch = xch->next)
-               if (xch->i1 - (xchp->i1 + xchp->chg1) > 2 * xecfg->ctxlen)
+               if (xch->i1 - (xchp->i1 + xchp->chg1) > max_common)
                        break;
 
        return xchp;
@@ -131,7 +132,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
        if (xecfg->flags & XDL_EMIT_COMMON)
                return xdl_emit_common(xe, xscr, ecb, xecfg);
 
-       for (xch = xche = xscr; xch; xch = xche->next) {
+       for (xch = xscr; xch; xch = xche->next) {
                xche = xdl_get_hunk(xch, xecfg);
 
                s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);