ERR: Move ERR_set_mark(), ERR_pop_to_mark() and ERR_clear_last_mark()

Move them to their own source file, so they end up in a separate
object file.  This allows providers to override their implementation
to use the corresponding OSSL_FUNC upcalls without having to
reimplement everything from crypto/err/err.c.

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17474)

3 files changed, 70 insertions, 56 deletions

diff --git a/crypto/err/build.info b/crypto/err/build.info
index 98f8801e34..ee37938418 100644
--- a/crypto/err/build.info
+++ b/crypto/err/build.info
@@ -1,3 +1,3 @@
 LIBS=../../libcrypto
 SOURCE[../../libcrypto]=\
-        err_blocks.c err.c err_all.c err_all_legacy.c err_prn.c
+        err_blocks.c err_mark.c err.c err_all.c err_all_legacy.c err_prn.c
diff --git a/crypto/err/err.c b/crypto/err/err.c
index 59ca4114db..63cf682382 100644
--- a/crypto/err/err.c
+++ b/crypto/err/err.c
@@ -847,61 +847,6 @@ void ERR_add_error_vdata(int num, va_list args)
         OPENSSL_free(str);
 }
 
-int ERR_set_mark(void)
-{
-    ERR_STATE *es;
-
-    es = ossl_err_get_state_int();
-    if (es == NULL)
-        return 0;
-
-    if (es->bottom == es->top)
-        return 0;
-    es->err_marks[es->top]++;
-    return 1;
-}
-
-int ERR_pop_to_mark(void)
-{
-    ERR_STATE *es;
-
-    es = ossl_err_get_state_int();
-    if (es == NULL)
-        return 0;
-
-    while (es->bottom != es->top
-           && es->err_marks[es->top] == 0) {
-        err_clear(es, es->top, 0);
-        es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
-    }
-
-    if (es->bottom == es->top)
-        return 0;
-    es->err_marks[es->top]--;
-    return 1;
-}
-
-int ERR_clear_last_mark(void)
-{
-    ERR_STATE *es;
-    int top;
-
-    es = ossl_err_get_state_int();
-    if (es == NULL)
-        return 0;
-
-    top = es->top;
-    while (es->bottom != top
-           && es->err_marks[top] == 0) {
-        top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
-    }
-
-    if (es->bottom == top)
-        return 0;
-    es->err_marks[top]--;
-    return 1;
-}
-
 void err_clear_last_constant_time(int clear)
 {
     ERR_STATE *es;
diff --git a/crypto/err/err_mark.c b/crypto/err/err_mark.c
new file mode 100644
index 0000000000..cc1baba7a3
--- /dev/null
+++ b/crypto/err/err_mark.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2003-2022 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#define OSSL_FORCE_ERR_STATE
+
+#include <openssl/err.h>
+#include "err_local.h"
+
+int ERR_set_mark(void)
+{
+    ERR_STATE *es;
+
+    es = ossl_err_get_state_int();
+    if (es == NULL)
+        return 0;
+
+    if (es->bottom == es->top)
+        return 0;
+    es->err_marks[es->top]++;
+    return 1;
+}
+
+int ERR_pop_to_mark(void)
+{
+    ERR_STATE *es;
+
+    es = ossl_err_get_state_int();
+    if (es == NULL)
+        return 0;
+
+    while (es->bottom != es->top
+           && es->err_marks[es->top] == 0) {
+        err_clear(es, es->top, 0);
+        es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
+    }
+
+    if (es->bottom == es->top)
+        return 0;
+    es->err_marks[es->top]--;
+    return 1;
+}
+
+int ERR_clear_last_mark(void)
+{
+    ERR_STATE *es;
+    int top;
+
+    es = ossl_err_get_state_int();
+    if (es == NULL)
+        return 0;
+
+    top = es->top;
+    while (es->bottom != top
+           && es->err_marks[top] == 0) {
+        top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
+    }
+
+    if (es->bottom == top)
+        return 0;
+    es->err_marks[top]--;
+    return 1;
+}
+