Simplify OBJ_obj2txt()

Instead of adding a NUL termination to OBJ_obj2txt(), move the aobj == NULL
or aobj->data == NULL checks to i2t_ASN1_OBJECT_internal(). The only other
caller, i2t_ASN1_OBJECT(), fails on aobj == NULL and aobj->length == 0, and
the latter condition is implied by aobj->data.

Cleaner solution for obj_dat.c r1.52
suggested by/ok jsing

2 files changed, 5 insertions, 8 deletions

diff --git a/src/lib/libcrypto/asn1/a_object.c b/src/lib/libcrypto/asn1/a_object.c
index 8c8ca8537f..af19858f74 100644
--- a/src/lib/libcrypto/asn1/a_object.c
+++ b/src/lib/libcrypto/asn1/a_object.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: a_object.c,v 1.49 2022/11/26 16:08:50 tb Exp $ */
+/* $OpenBSD: a_object.c,v 1.50 2023/05/23 11:51:12 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -433,6 +433,9 @@ i2t_ASN1_OBJECT_internal(const ASN1_OBJECT *aobj, char *buf, int buf_len, int no
         if (buf_len > 0)
                 buf[0] = '\0';
 
+        if (aobj == NULL || aobj->data == NULL)
+                return 0;
+
         if (!CBB_init(&cbb, 0))
                 goto err;
         if (!i2t_ASN1_OBJECT_cbb(aobj, &cbb, no_name))
diff --git a/src/lib/libcrypto/objects/obj_dat.c b/src/lib/libcrypto/objects/obj_dat.c
index fcc21ddfb4..7516a6d09a 100644
--- a/src/lib/libcrypto/objects/obj_dat.c
+++ b/src/lib/libcrypto/objects/obj_dat.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: obj_dat.c,v 1.52 2023/05/23 11:04:04 tb Exp $ */
+/* $OpenBSD: obj_dat.c,v 1.53 2023/05/23 11:51:12 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -499,12 +499,6 @@ OBJ_txt2obj(const char *s, int no_name)
 int
 OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *aobj, int no_name)
 {
-        if (buf_len > 0)
-                buf[0] = '\0';
-
-        if (aobj == NULL || aobj->data == NULL)
-                return 0;
-
         return i2t_ASN1_OBJECT_internal(aobj, buf, buf_len, no_name);
 }