prefix_filename(): safely handle the case where pfx_len=0

diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c
index 3e97462bdd2ed72b4ec60a1eb3869e516609867b..da67c04357dfe4d3283c589f5d47be9c5f2b7fcf 100644 (file)
--- a/xdiff/xdiffi.c
+++ b/xdiff/xdiffi.c
@@ -26,7 +26,7 @@
 
 #define XDL_MAX_COST_MIN 256
 #define XDL_HEUR_MIN_COST 256
-#define XDL_LINE_MAX (long)((1UL << (8 * sizeof(long) - 1)) - 1)
+#define XDL_LINE_MAX (long)((1UL << (CHAR_BIT * sizeof(long) - 1)) - 1)
 #define XDL_SNAKE_CNT 20
 #define XDL_K_HEUR 4
 
@@ -293,15 +293,14 @@ int xdl_recs_cmp(diffdata_t *dd1, long off1, long lim1,
                for (; off1 < lim1; off1++)
                        rchg1[rindex1[off1]] = 1;
        } else {
-               long ec;
                xdpsplit_t spl;
                spl.i1 = spl.i2 = 0;
 
                /*
                 * Divide ...
                 */
-               if ((ec = xdl_split(ha1, off1, lim1, ha2, off2, lim2, kvdf, kvdb,
-                                   need_min, &spl, xenv)) < 0) {
+               if (xdl_split(ha1, off1, lim1, ha2, off2, lim2, kvdf, kvdb,
+                             need_min, &spl, xenv) < 0) {
 
                        return -1;
                }
@@ -457,7 +456,7 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
                        /*
                         * Record the end-of-group position in case we are matched
                         * with a group of changes in the other file (that is, the
-                        * change record before the enf-of-group index in the other
+                        * change record before the end-of-group index in the other
                         * file is set).
                         */
                        ixref = rchgo[ixo - 1] ? ix: nrec;