diff options
Diffstat (limited to 'lib/fseeko.c')
| -rw-r--r-- | lib/fseeko.c | 53 |
1 files changed, 33 insertions, 20 deletions
diff --git a/lib/fseeko.c b/lib/fseeko.c index 2dd4cdc..c03be3d 100644 --- a/lib/fseeko.c +++ b/lib/fseeko.c @@ -1,5 +1,5 @@ /* An fseeko() function that, together with fflush(), is POSIX compliant. - Copyright (C) 2007-2011 Free Software Foundation, Inc. + Copyright (C) 2007-2013 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -12,15 +12,14 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License along - with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include <stdio.h> -/* Get off_t and lseek. */ +/* Get off_t, lseek, _POSIX_VERSION. */ #include <unistd.h> #include "stdio-impl.h" @@ -32,6 +31,14 @@ fseeko (FILE *fp, off_t offset, int whence) # undef fseek # define fseeko fseek #endif +#if _GL_WINDOWS_64_BIT_OFF_T +# undef fseeko +# if HAVE__FSEEKI64 /* msvc, mingw64 */ +# define fseeko _fseeki64 +# else /* mingw */ +# define fseeko fseeko64 +# endif +#endif { #if LSEEK_PIPE_BROKEN /* mingw gives bogus answers rather than failure on non-seekable files. */ @@ -44,7 +51,7 @@ fseeko (FILE *fp, off_t offset, int whence) if (fp->_IO_read_end == fp->_IO_read_ptr && fp->_IO_write_ptr == fp->_IO_write_base && fp->_IO_save_base == NULL) -#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */ +#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */ # if defined __SL64 && defined __SCLE /* Cygwin */ if ((fp->_flags & __SL64) == 0) { @@ -69,6 +76,9 @@ fseeko (FILE *fp, off_t offset, int whence) && fp->_rcount == 0 && fp->_wcount == 0 && fp->_ungetc_count == 0) +#elif defined __minix /* Minix */ + if (fp_->_ptr == fp_->_buf + && (fp_->_ptr == NULL || fp_->_count == 0)) #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */ if (fp_->_ptr == fp_->_base && (fp_->_ptr == NULL || fp_->_cnt == 0)) @@ -86,21 +96,26 @@ fseeko (FILE *fp, off_t offset, int whence) && fp->__get_limit == fp->__bufp && fp->__put_limit == fp->__bufp && !fp->__pushed_back) +#elif defined EPLAN9 /* Plan9 */ + if (fp->rp == fp->buf + && fp->wp == fp->buf) +#elif FUNC_FFLUSH_STDIN < 0 && 200809 <= _POSIX_VERSION + /* Cross-compiling to some other system advertising conformance to + POSIX.1-2008 or later. Assume fseeko and fflush work as advertised. + If this assumption is incorrect, please report the bug to + bug-gnulib. */ + if (0) #else - #error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib." + #error "Please port gnulib fseeko.c to your platform! Look at the code in fseeko.c, then report this to bug-gnulib." #endif { - /* We get here when an fflush() call immediately preceded this one. We - know there are no buffers. - POSIX requires us to modify the file descriptor's position. - But we cannot position beyond end of file here. */ - off_t pos = - lseek (fileno (fp), - whence == SEEK_END && offset > 0 ? 0 : offset, - whence); + /* We get here when an fflush() call immediately preceded this one (or + if ftell() has created buffers but no I/O has occurred on a + newly-opened stream). We know there are no buffers. */ + off_t pos = lseek (fileno (fp), offset, whence); if (pos == -1) { -#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */ +#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */ fp_->_flags &= ~__SOFF; #endif return -1; @@ -108,7 +123,8 @@ fseeko (FILE *fp, off_t offset, int whence) #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ fp->_flags &= ~_IO_EOF_SEEN; -#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */ + fp->_offset = pos; +#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */ # if defined __CYGWIN__ /* fp_->_offset is typed as an integer. */ fp_->_offset = pos; @@ -137,10 +153,7 @@ fseeko (FILE *fp, off_t offset, int whence) fp->__offset = pos; fp->__eof = 0; #endif - /* If we were not requested to position beyond end of file, we're - done. */ - if (!(whence == SEEK_END && offset > 0)) - return 0; + return 0; } return fseeko (fp, offset, whence); } |