From ec82d7a92b6b36ee82a051ac437d5206971e179b Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Sun, 21 Feb 2016 21:20:45 -0800
Subject: [PATCH] configure: smarter way to handle fseeko() searching

Better handling of the replacement for fseeko() in its absence; also
look for the Windows _fseeki64() function.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
 compiler.h   | 14 ++++++++++++++
 configure.in |  2 +-
 nasmlib.c    |  5 -----
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/compiler.h b/compiler.h
index 4b29d367..310e79b9 100644
--- a/compiler.h
+++ b/compiler.h
@@ -99,6 +99,20 @@ int vsnprintf(char *, size_t, const char *, va_list);
 # endif
 #endif
 
+/* Missing fseeko/ftello */
+#ifndef HAVE_FSEEKO
+# undef off_t                   /* Just in case it is a macro */
+# ifdef HAVE__FSEEKI64
+#  define fseeko _fseeki64
+#  define ftello _ftelli64
+#  define off_t  int64_t
+# else
+#  define fseeko fseek
+#  define ftello ftell
+#  define off_t  long
+# endif
+#endif
+
 #if !defined(HAVE_STRLCPY) || !HAVE_DECL_STRLCPY
 size_t strlcpy(char *, const char *, size_t);
 #endif
diff --git a/configure.in b/configure.in
index 38306c2d..e05811a3 100644
--- a/configure.in
+++ b/configure.in
@@ -139,8 +139,8 @@ AC_CHECK_FUNCS(canonicalize_file_name)
 AC_CHECK_FUNCS(_fullpath)
 AC_CHECK_FUNCS(pathconf)
 
-AC_TYPE_OFF_T
 AC_FUNC_FSEEKO
+AC_CHECK_FUNCS([_fseeki64])
 AC_CHECK_FUNCS([ftruncate _chsize _chsize_s])
 AC_CHECK_FUNCS([fileno])
 
diff --git a/nasmlib.c b/nasmlib.c
index eb0217d1..41da9f0e 100644
--- a/nasmlib.c
+++ b/nasmlib.c
@@ -459,11 +459,6 @@ void fwriteaddr(uint64_t data, int size, FILE * fp)
 
 #endif
 
-#ifndef HAVE_FSEEKO
-# define fseeko fseek
-# define ftello ftell
-#endif
-
 #ifdef HAVE_FILENO		/* Useless without fileno() */
 # ifdef HAVE__CHSIZE_S
 #  define nasm_ftruncate(fd,size) _chsize_s(fd,size)