[fix] Variable initialization fixes for libxdiff

Signed-off-by: David Cantrell <[email protected]>

Author: dcantrell

libxdiff/xdiffi.c

@@ -578,10 +578,12 @@ static void xdl_mark_ignorable(xdchange_t *xscr, xdfenv_t *xe, long flags)
 
 int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
 	     xdemitconf_t const *xecfg, xdemitcb_t *ecb) {
-	xdchange_t *xscr;
+	xdchange_t *xscr = NULL;
 	xdfenv_t xe;
 	emit_func_t ef = xecfg->hunk_func ? xdl_call_hunk_func : xdl_emit_diff;
 
+	memset(&xe, 0, sizeof(xe));
+
 	if (xdl_do_diff(mf1, mf2, xpp, &xe) < 0) {
 
 		return -1;

libxdiff/xemit.c

@@ -165,8 +165,8 @@ static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
 
 int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb, xdemitconf_t const *xecfg)
 {
-	unsigned long s1, s2, e1, e2, lctx;
-	xdchange_t *xch, *xche;
+	unsigned long s1 = 0, s2 = 0, e1 = 0, e2 = 0, lctx = 0;
+	xdchange_t *xch = NULL, *xche = NULL;
 	unsigned long funclineprev = -1;
 	struct func_line func_line = { 0 };
 

libxdiff/xutils.c

@@ -420,6 +420,8 @@ int xdl_emit_hunk_hdr(long unsigned s1, long unsigned c1, long unsigned s2, long
 	mmbuffer_t mb;
 	char buf[128];
 
+	memset(&mb, 0, sizeof(mb));
+
 	memcpy(buf, "@@ -", 4);
 	nb += 4;
 
@@ -457,6 +459,7 @@ int xdl_emit_hunk_hdr(long unsigned s1, long unsigned c1, long unsigned s2, long
 
 	mb.ptr = buf;
 	mb.size = nb;
+
 	if (ecb->outf(ecb->priv, &mb, 1) < 0)
 		return -1;