Evaluate truncate, ftruncate and ftello existence

This corrects mingw-w64 compilation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31262 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 15 insertions, 3 deletions

diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index 791085fa6c..d822a016dc 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -381,11 +381,23 @@ scalb(double a, long b)
 //
 
 #define SUFFIX
+
+#if !defined HAVE_FTRUNCATE
 #define ftruncate rb_w32_ftruncate
-extern int       truncate(const char *path, off_t length);
-extern int       ftruncate(int fd, off_t length);
+extern int       rb_w32_ftruncate(int fd, off_t length);
+#endif
+
+#if !defined HAVE_TRUNCATE
+#define truncate rb_w32_truncate
+extern int       rb_w32_truncate(const char *path, off_t length);
+#endif
+
 extern int       fseeko(FILE *stream, off_t offset, int whence);
-extern off_t     ftello(FILE *stream);
+
+#if !defined HAVE_FTELLO
+#define ftello rb_w32_ftello
+extern off_t     rb_w32_ftello(FILE *stream);
+#endif
 
 //
 // stubs