Avoid duplicate ends_with_dirsep functions

Refactor them into inline ossl_ends_with_dirsep function in
internal/cryptlib.h.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13306)

doc/internal/man3/ossl_ends_with_dirsep.pod

@@ -0,0 +1,38 @@
+=pod
+
+=head1 NAME
+
+ossl_ends_with_dirsep - internal function to detect whether a path
+ends with directory separator
+
+=head1 SYNOPSIS
+
+  #include "internal/cryptlib.h"
+
+  int ossl_ends_with_dirsep(const char *path);
+
+=head1 DESCRIPTION
+
+ossl_ends_with_dirsep() detects whether the I<path> ends with a directory
+separator in platform agnostic way.
+
+=head1 RETURN VALUES
+
+ossl_ends_with_dirsep() returns 1 if the I<path> ends with a directory
+separator, 0 otherwise.
+
+=head1 HISTORY
+
+The function described here was added in OpenSSL 3.0.
+
+=head1 COPYRIGHT
+
+Copyright 2019-2020 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
+L<https://www.openssl.org/source/license.html>.
+
+=cut
+

engines/e_loader_attic.c

@@ -1424,27 +1424,13 @@ static int file_read_asn1(BIO *bp, unsigned char **data, long *len)
     return 1;
 }
 
-static int ends_with_dirsep(const char *uri)
-{
-    if (*uri != '\0')
-        uri += strlen(uri) - 1;
-#if defined(__VMS)
-    if (*uri == ']' || *uri == '>' || *uri == ':')
-        return 1;
-#elif defined(_WIN32)
-    if (*uri == '\\')
-        return 1;
-#endif
-    return *uri == '/';
-}
-
 static int file_name_to_uri(OSSL_STORE_LOADER_CTX *ctx, const char *name,
                             char **data)
 {
     assert(name != NULL);
     assert(data != NULL);
     {
-        const char *pathsep = ends_with_dirsep(ctx->uri) ? "" : "/";
+        const char *pathsep = ossl_ends_with_dirsep(ctx->uri) ? "" : "/";
         long calculated_length = strlen(ctx->uri) + strlen(pathsep)
             + strlen(name) + 1 /* \0 */;
 

include/internal/cryptlib.h

@@ -253,4 +253,18 @@ char *openssl_buf2hexstr_sep(const unsigned char *buf, long buflen, char sep);
 unsigned char *openssl_hexstr2buf_sep(const char *str, long *buflen,
                                       const char sep);
 
+static ossl_inline int ossl_ends_with_dirsep(const char *path)
+{
+    if (*path != '\0')
+        path += strlen(path) - 1;
+# if defined __VMS
+    if (*path == ']' || *path == '>' || *path == ':')
+        return 1;
+# elif defined _WIN32
+    if (*path == '\\')
+        return 1;
+# endif
+    return *path == '/';
+}
+
 #endif

providers/implementations/storemgmt/file_store.c

@@ -24,6 +24,7 @@
 #include <openssl/params.h>
 #include <openssl/decoder.h>
 #include <openssl/store.h>       /* The OSSL_STORE_INFO type numbers */
+#include "internal/cryptlib.h"
 #include "internal/o_dir.h"
 #include "crypto/pem.h"          /* For PVK and "blob" PEM headers */
 #include "crypto/decoder.h"
@@ -647,27 +648,13 @@ static int file_load_file(struct file_ctx_st *ctx,
  *  --------------------------------------
  */
 
-static int ends_with_dirsep(const char *uri)
-{
-    if (*uri != '\0')
-        uri += strlen(uri) - 1;
-#if defined(__VMS)
-    if (*uri == ']' || *uri == '>' || *uri == ':')
-        return 1;
-#elif defined(_WIN32)
-    if (*uri == '\\')
-        return 1;
-#endif
-    return *uri == '/';
-}
-
 static char *file_name_to_uri(struct file_ctx_st *ctx, const char *name)
 {
     char *data = NULL;
 
     assert(name != NULL);
     {
-        const char *pathsep = ends_with_dirsep(ctx->uri) ? "" : "/";
+        const char *pathsep = ossl_ends_with_dirsep(ctx->uri) ? "" : "/";
         long calculated_length = strlen(ctx->uri) + strlen(pathsep)
             + strlen(name) + 1 /* \0 */;