propagated const, to avoid "discards qualifiers from pointer target type" errors

ext/ereg/regex/regcomp.c

@@ -724,9 +724,9 @@ register struct parse *p;
 register cset *cs;
 {
 	register unsigned char *sp = p->next;
-	register struct cclass *cp;
+	register const struct cclass *cp;
 	register size_t len;
-	register unsigned char *u;
+	register const unsigned char *u;
 	register unsigned char c;
 
 	while (MORE() && isalpha(PEEK()))
@@ -795,7 +795,7 @@ register struct parse *p;
 int endc;			/* name ended by endc,']' */
 {
 	register unsigned char *sp = p->next;
-	register struct cname *cp;
+	register const struct cname *cp;
 	register int len;
 
 	while (MORE() && !SEETWO(endc, ']'))
@@ -1153,7 +1153,7 @@ static void
 mcadd(p, cs, cp)
 register struct parse *p;
 register cset *cs;
-register unsigned char *cp;
+register const unsigned char *cp;
 {
 	register size_t oldend = cs->smultis;
 

ext/ereg/regex/regcomp.ih

@@ -27,7 +27,7 @@ static void freeset(register struct parse *p, register cset *cs);
 static int freezeset(register struct parse *p, register cset *cs);
 static int firstch(register struct parse *p, register cset *cs);
 static int nch(register struct parse *p, register cset *cs);
-static void mcadd(register struct parse *p, register cset *cs, register unsigned char *cp);
+static void mcadd(register struct parse *p, register cset *cs, register const unsigned char *cp);
 #if 0
 static void mcsub(register cset *cs, register unsigned char *cp);
 static int mcin(register cset *cs, register unsigned char *cp);

ext/simplexml/simplexml.c

@@ -67,7 +67,7 @@ static void php_sxe_iterator_rewind(zend_object_iterator *iter TSRMLS_DC);
 
 /* {{{ _node_as_zval()
  */
-static void _node_as_zval(php_sxe_object *sxe, xmlNodePtr node, zval *value, SXE_ITER itertype, char *name, xmlChar *nsprefix, int isprefix TSRMLS_DC)
+static void _node_as_zval(php_sxe_object *sxe, xmlNodePtr node, zval *value, SXE_ITER itertype, char *name, const xmlChar *nsprefix, int isprefix TSRMLS_DC)
 {
 	php_sxe_object *subnode;
 
@@ -79,7 +79,7 @@ static void _node_as_zval(php_sxe_object *sxe, xmlNodePtr node, zval *value, SXE
 		subnode->iter.name = xmlStrdup((xmlChar *)name);
 	}
 	if (nsprefix && *nsprefix) {
-		subnode->iter.nsprefix = xmlStrdup((xmlChar *)nsprefix);
+		subnode->iter.nsprefix = xmlStrdup(nsprefix);
 		subnode->iter.isprefix = isprefix;
 	}