X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fftruncate.c;h=33b69d81076040bb128f0555d9e230f34e66ec6a;hb=1bb384c44db25aef8f8b455cef22af32d8401abc;hp=d4c129a18f991506b0957a8a19b5910404827678;hpb=67f394c1d2be473276ccd5e071f986511a13e212;p=gnulib.git

diff --git a/lib/ftruncate.c b/lib/ftruncate.c
index d4c129a18..33b69d810 100644
--- a/lib/ftruncate.c
+++ b/lib/ftruncate.c
@@ -1,9 +1,10 @@
 /* ftruncate emulations that work on some System V's.
    This file is in the public domain.  */
 
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+
+/* Specification.  */
+#include <unistd.h>
 
 #include <sys/types.h>
 #include <fcntl.h>
@@ -11,9 +12,7 @@
 #ifdef F_CHSIZE
 
 int
-ftruncate (fd, length)
-     int fd;
-     off_t length;
+ftruncate (int fd, off_t length)
 {
   return fcntl (fd, F_CHSIZE, length);
 }
@@ -25,14 +24,9 @@ ftruncate (fd, length)
 
 #  include <sys/stat.h>
 #  include <errno.h>
-#  if HAVE_UNISTD_H
-#   include <unistd.h>
-#  endif
 
 int
-ftruncate (fd, length)
-     int fd;
-     off_t length;
+ftruncate (int fd, off_t length)
 {
   struct flock fl;
   struct stat filebuf;
@@ -44,11 +38,11 @@ ftruncate (fd, length)
     {
       /* Extend file length. */
       if (lseek (fd, (length - 1), SEEK_SET) < 0)
-	return -1;
+        return -1;
 
       /* Write a "0" byte. */
       if (write (fd, "", 1) != 1)
-	return -1;
+        return -1;
     }
   else
     {
@@ -58,26 +52,24 @@ ftruncate (fd, length)
       fl.l_whence = 0;
       fl.l_len = 0;
       fl.l_start = length;
-      fl.l_type = F_WRLCK;	/* write lock on file space */
+      fl.l_type = F_WRLCK;      /* write lock on file space */
 
       /* This relies on the *undocumented* F_FREESP argument to fcntl,
-	 which truncates the file so that it ends at the position
-	 indicated by fl.l_start.  Will minor miracles never cease?  */
+         which truncates the file so that it ends at the position
+         indicated by fl.l_start.  Will minor miracles never cease?  */
 
       if (fcntl (fd, F_FREESP, &fl) < 0)
-	return -1;
+        return -1;
     }
 
   return 0;
 }
 
 # else /* not F_CHSIZE nor F_FREESP */
-#  if HAVE_CHSIZE
+#  if HAVE_CHSIZE                      /* native Windows, e.g. mingw */
 
 int
-ftruncate (fd, length)
-     int fd;
-     off_t length;
+ftruncate (int fd, off_t length)
 {
   return chsize (fd, length);
 }
@@ -85,14 +77,9 @@ ftruncate (fd, length)
 #  else /* not F_CHSIZE nor F_FREESP nor HAVE_CHSIZE */
 
 #   include <errno.h>
-#   ifndef errno
-extern int errno;
-#   endif
 
 int
-ftruncate (fd, length)
-     int fd;
-     off_t length;
+ftruncate (int fd, off_t length)
 {
   errno = EIO;
   return -1;