crypto/o_fopen.c: alias fopen to fopen64.

[openssl.git] / crypto / o_fopen.c

diff --git a/crypto/o_fopen.c b/crypto/o_fopen.c
index 1b4028c9a81a807e35bc8ca58f36e4718d1b2108..f08f99b414f5ce475ec6716690e8f78741ff3e80 100644 (file)
--- a/crypto/o_fopen.c
+++ b/crypto/o_fopen.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -7,6 +7,24 @@
  * https://www.openssl.org/source/license.html
  */
 
+# if defined(__linux) || defined(__sun) || defined(__hpux)
+/*
+ * Following definition aliases fopen to fopen64 on above mentioned
+ * platforms. This makes it possible to open and sequentially access files
+ * larger than 2GB from 32-bit application. It does not allow to traverse
+ * them beyond 2GB with fseek/ftell, but on the other hand *no* 32-bit
+ * platform permits that, not with fseek/ftell. Not to mention that breaking
+ * 2GB limit for seeking would require surgery to *our* API. But sequential
+ * access suffices for practical cases when you can run into large files,
+ * such as fingerprinting, so we can let API alone. For reference, the list
+ * of 32-bit platforms which allow for sequential access of large files
+ * without extra "magic" comprise *BSD, Darwin, IRIX...
+ */
+#  ifndef _FILE_OFFSET_BITS
+#   define _FILE_OFFSET_BITS 64
+#  endif
+# endif
+
 #include "internal/cryptlib.h"
 
 #if !defined(OPENSSL_NO_STDIO)
@@ -71,9 +89,10 @@ FILE *openssl_fopen(const char *filename, const char *mode)
             char *iterator;
             char lastchar;
 
-            newname = OPENSSL_malloc(strlen(filename) + 1);
-            if (newname == NULL)
+            if ((newname = OPENSSL_malloc(strlen(filename) + 1)) == NULL) {
+                CRYPTOerr(CRYPTO_F_OPENSSL_FOPEN, ERR_R_MALLOC_FAILURE);
                 return NULL;
+            }
 
             for (iterator = newname, lastchar = '\0';
                 *filename; filename++, iterator++) {