[Bug-gnulib] utime() replacement optimization

[Bruno Haible]

Hi,

I did this change. There is a need to ftruncate() a file during "touch"
only if it was and should remain empty.


2002-12-22  Bruno Haible  <address@hidden>

        * utime.c (utime_null): No need to call ftruncate if the file was
        nonempty.

diff -r -c3 gnulib-cvs/lib/utime.c gnulib/lib/utime.c
*** gnulib-cvs/lib/utime.c      2002-12-17 12:42:00.000000000 +0100
--- gnulib/lib/utime.c  2002-12-22 18:46:19.000000000 +0100
***************
*** 65,71 ****
         of patches, but that system doesn't use this code: it has utimes.
         || fsync (fd) < 0
        */
!       || ftruncate (fd, st.st_size) < 0
        || close (fd) < 0)
      status = -1;
    return status;
--- 65,71 ----
         of patches, but that system doesn't use this code: it has utimes.
         || fsync (fd) < 0
        */
!       || (st.st_size == 0 && ftruncate (fd, st.st_size) < 0)
        || close (fd) < 0)
      status = -1;
    return status;