1/* -*- buffer-read-only: t -*- vi: set ro: */ 2/* DO NOT EDIT! GENERATED AUTOMATICALLY! */ 3#line 1 4/* An fseeko() function that, together with fflush(), is POSIX compliant. 5 Copyright (C) 2007-2010 Free Software Foundation, Inc. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License along 18 with this program; if not, write to the Free Software Foundation, 19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 20 21#include <config.h> 22 23/* Specification. */ 24#include <stdio.h> 25 26/* Get off_t and lseek. */ 27#include <unistd.h> 28 29#include "stdio-impl.h" 30 31#undef fseeko 32#if !HAVE_FSEEKO 33# undef fseek 34# define fseeko fseek 35#endif 36 37int 38rpl_fseeko (FILE *fp, off_t offset, int whence) 39{ 40#if LSEEK_PIPE_BROKEN 41 /* mingw gives bogus answers rather than failure on non-seekable files. */ 42 if (lseek (fileno (fp), 0, SEEK_CUR) == -1) 43 return EOF; 44#endif 45 46 /* These tests are based on fpurge.c. */ 47#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ 48 if (fp->_IO_read_end == fp->_IO_read_ptr 49 && fp->_IO_write_ptr == fp->_IO_write_base 50 && fp->_IO_save_base == NULL) 51#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */ 52# if defined __SL64 && defined __SCLE /* Cygwin */ 53 if ((fp->_flags & __SL64) == 0) 54 { 55 /* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit 56 mode; but has an fseeko that requires 64-bit mode. */ 57 FILE *tmp = fopen ("/dev/null", "r"); 58 if (!tmp) 59 return -1; 60 fp->_flags |= __SL64; 61 fp->_seek64 = tmp->_seek64; 62 fclose (tmp); 63 } 64# endif 65 if (fp_->_p == fp_->_bf._base 66 && fp_->_r == 0 67 && fp_->_w == ((fp_->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */ 68 ? fp_->_bf._size 69 : 0) 70 && fp_ub._base == NULL) 71#elif defined __EMX__ /* emx+gcc */ 72 if (fp->_ptr == fp->_buffer 73 && fp->_rcount == 0 74 && fp->_wcount == 0 75 && fp->_ungetc_count == 0) 76#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */ 77 if (fp_->_ptr == fp_->_base 78 && (fp_->_ptr == NULL || fp_->_cnt == 0)) 79#elif defined __UCLIBC__ /* uClibc */ 80 if (((fp->__modeflags & __FLAG_WRITING) == 0 81 || fp->__bufpos == fp->__bufstart) 82 && ((fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) == 0 83 || fp->__bufpos == fp->__bufread)) 84#elif defined __QNX__ /* QNX */ 85 if ((fp->_Mode & 0x2000 /* _MWRITE */ ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend) 86 && fp->_Rback == fp->_Back + sizeof (fp->_Back) 87 && fp->_Rsave == NULL) 88#elif defined __MINT__ /* Atari FreeMiNT */ 89 if (fp->__bufp == fp->__buffer 90 && fp->__get_limit == fp->__bufp 91 && fp->__put_limit == fp->__bufp 92 && !fp->__pushed_back) 93#else 94 #error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib." 95#endif 96 { 97 /* We get here when an fflush() call immediately preceded this one. We 98 know there are no buffers. 99 POSIX requires us to modify the file descriptor's position. 100 But we cannot position beyond end of file here. */ 101 off_t pos = 102 lseek (fileno (fp), 103 whence == SEEK_END && offset > 0 ? 0 : offset, 104 whence); 105 if (pos == -1) 106 { 107#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */ 108 fp_->_flags &= ~__SOFF; 109#endif 110 return -1; 111 } 112 113#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ 114 fp->_flags &= ~_IO_EOF_SEEN; 115#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */ 116# if defined __CYGWIN__ 117 /* fp_->_offset is typed as an integer. */ 118 fp_->_offset = pos; 119# else 120 /* fp_->_offset is an fpos_t. */ 121 { 122 /* Use a union, since on NetBSD, the compilation flags 123 determine whether fpos_t is typedef'd to off_t or a struct 124 containing a single off_t member. */ 125 union 126 { 127 fpos_t f; 128 off_t o; 129 } u; 130 u.o = pos; 131 fp_->_offset = u.f; 132 } 133# endif 134 fp_->_flags |= __SOFF; 135 fp_->_flags &= ~__SEOF; 136#elif defined __EMX__ /* emx+gcc */ 137 fp->_flags &= ~_IOEOF; 138#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */ 139 fp->_flag &= ~_IOEOF; 140#elif defined __MINT__ /* Atari FreeMiNT */ 141 fp->__offset = pos; 142 fp->__eof = 0; 143#endif 144 /* If we were not requested to position beyond end of file, we're 145 done. */ 146 if (!(whence == SEEK_END && offset > 0)) 147 return 0; 148 } 149 return fseeko (fp, offset, whence); 150} 151