diff options
Diffstat (limited to 'gnulib/lib/fseeko.c')
-rw-r--r-- | gnulib/lib/fseeko.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/gnulib/lib/fseeko.c b/gnulib/lib/fseeko.c new file mode 100644 index 000000000..c66ba263b --- /dev/null +++ b/gnulib/lib/fseeko.c @@ -0,0 +1,120 @@ +/* An fseeko() function that, together with fflush(), is POSIX compliant. + Copyright (C) 2007 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser 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. */ + +#include <config.h> + +/* Specification. */ +#include <stdio.h> + +/* Get off_t and lseek. */ +#include <unistd.h> + +#undef fseeko +#if !HAVE_FSEEKO +# undef fseek +# define fseeko fseek +#endif + +int +rpl_fseeko (FILE *fp, off_t offset, int whence) +{ +#if LSEEK_PIPE_BROKEN + /* mingw gives bogus answers rather than failure on non-seekable files. */ + if (lseek (fileno (fp), 0, SEEK_CUR) == -1) + return EOF; +#endif + + /* These tests are based on fpurge.c. */ +#if defined _IO_ferror_unlocked /* GNU libc, BeOS */ + 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 /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */ +# if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */ + /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> + and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */ +# define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub +# else /* FreeBSD, MacOS X, Cygwin */ +# define fp_ub fp->_ub +# endif +# if defined __SL64 && defined __SCLE /* Cygwin */ + if ((fp->_flags & __SL64) == 0) + { + /* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit + mode; but has an fseeko that requires 64-bit mode. */ + FILE *tmp = fopen ("/dev/null", "r"); + if (!tmp) + return -1; + fp->_flags |= __SL64; + fp->_seek64 = tmp->_seek64; + fclose (tmp); + } +# endif + if (fp->_p == fp->_bf._base + && fp->_r == 0 + && fp->_w == ((fp->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */ + ? fp->_bf._size + : 0) + && fp_ub._base == NULL) +#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */ +# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */ +# define fp_ ((struct { unsigned char *_ptr; \ + unsigned char *_base; \ + unsigned char *_end; \ + long _cnt; \ + int _file; \ + unsigned int _flag; \ + } *) fp) + if (fp_->_ptr == fp_->_base + && (fp_->_ptr == NULL || fp_->_cnt == 0)) +# else + if (fp->_ptr == fp->_base + && (fp->_ptr == NULL || fp->_cnt == 0)) +# endif +#elif defined __UCLIBC__ /* uClibc */ + if (((fp->__modeflags & __FLAG_WRITING) == 0 + || fp->__bufpos == fp->__bufstart) + && ((fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) == 0 + || fp->__bufpos == fp->__bufread)) +#elif defined __QNX__ /* QNX */ + if ((fp->_Mode & _MWRITE ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend) + && fp->_Rback == fp->_Back + sizeof (fp->_Back) + && fp->_Rsave == NULL) +#else + #error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib." +#endif + { + off_t pos = lseek (fileno (fp), offset, whence); + if (pos == -1) + { +#if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */ + fp->_flags &= ~__SOFF; +#endif + return -1; + } + else + { +#if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */ + fp->_offset = pos; + fp->_flags |= __SOFF; +#endif + return 0; + } + } + else + return fseeko (fp, offset, whence); +} |