Constify X509_TRUST_add method.

Reviewed-by: NKurt Roeckx <kurt@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1215)

apps/x509.c

@@ -1088,7 +1088,7 @@ static int sign(X509 *x, EVP_PKEY *pkey, int days, int clrext,
 static int purpose_print(BIO *bio, X509 *cert, X509_PURPOSE *pt)
 {
     int id, i, idret;
-    char *pname;
+    const char *pname;
     id = X509_PURPOSE_get_id(pt);
     pname = X509_PURPOSE_get0_name(pt);
     for (i = 0; i < 2; i++) {

crypto/x509/x509_trs.c

@@ -120,7 +120,7 @@ int X509_TRUST_set(int *t, int trust)
 }
 
 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
-                   char *name, int arg1, void *arg2)
+                   const char *name, int arg1, void *arg2)
 {
     int idx;
     X509_TRUST *trtmp;
@@ -201,17 +201,17 @@ void X509_TRUST_cleanup(void)
     trtable = NULL;
 }
 
-int X509_TRUST_get_flags(X509_TRUST *xp)
+int X509_TRUST_get_flags(const X509_TRUST *xp)
 {
     return xp->flags;
 }
 
-char *X509_TRUST_get0_name(X509_TRUST *xp)
+char *X509_TRUST_get0_name(const X509_TRUST *xp)
 {
     return xp->name;
 }
 
-int X509_TRUST_get_trust(X509_TRUST *xp)
+int X509_TRUST_get_trust(const X509_TRUST *xp)
 {
     return xp->trust;
 }

include/openssl/x509.h

@@ -989,11 +989,11 @@ int X509_TRUST_get_count(void);
 X509_TRUST *X509_TRUST_get0(int idx);
 int X509_TRUST_get_by_id(int id);
 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
-                   char *name, int arg1, void *arg2);
+                   const char *name, int arg1, void *arg2);
 void X509_TRUST_cleanup(void);
-int X509_TRUST_get_flags(X509_TRUST *xp);
-char *X509_TRUST_get0_name(X509_TRUST *xp);
-int X509_TRUST_get_trust(X509_TRUST *xp);
+int X509_TRUST_get_flags(const X509_TRUST *xp);
+char *X509_TRUST_get0_name(const X509_TRUST *xp);
+int X509_TRUST_get_trust(const X509_TRUST *xp);
 
 /* BEGIN ERROR CODES */
 /*