X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffseeko.c;h=1fd1266bfe9726b604a037f59e7aacce84845938;hb=cc7a4e12a15c81018321fdf653c081cb42cf05b3;hp=48c833b8404ebf5e44f2168f9cff5a101b4aee64;hpb=e0cbd8d3ad576fda177792c4c3ad75a3823f61ee;p=gnulib.git diff --git a/lib/fseeko.c b/lib/fseeko.c index 48c833b84..1fd1266bf 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 Free Software Foundation, Inc. + Copyright (C) 2007-2010 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 @@ -23,14 +23,15 @@ /* Get off_t and lseek. */ #include +#include "stdio-impl.h" + +int +fseeko (FILE *fp, off_t offset, int whence) #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. */ @@ -39,82 +40,107 @@ rpl_fseeko (FILE *fp, off_t offset, int whence) #endif /* These tests are based on fpurge.c. */ -#if defined _IO_ferror_unlocked /* GNU libc, BeOS */ +#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ 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 - and */ -# define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub -# else /* FreeBSD, MacOS X, Cygwin */ -# define fp_ub fp->_ub -# endif +#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */ # 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. */ + mode; but has an fseeko that requires 64-bit mode. */ FILE *tmp = fopen ("/dev/null", "r"); if (!tmp) - return -1; + 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) + 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) +#elif defined __EMX__ /* emx+gcc */ + if (fp->_ptr == fp->_buffer + && fp->_rcount == 0 + && fp->_wcount == 0 + && fp->_ungetc_count == 0) +#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */ 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)) + || fp->__bufpos == fp->__bufread)) #elif defined __QNX__ /* QNX */ - if ((fp->_Mode & _MWRITE ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend) + if ((fp->_Mode & 0x2000 /* _MWRITE */ ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend) && fp->_Rback == fp->_Back + sizeof (fp->_Back) && fp->_Rsave == NULL) +#elif defined __MINT__ /* Atari FreeMiNT */ + if (fp->__bufp == fp->__buffer + && fp->__get_limit == fp->__bufp + && fp->__put_limit == fp->__bufp + && !fp->__pushed_back) #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); + /* 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); if (pos == -1) - { -#if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */ - fp->_flags &= ~__SOFF; + { +#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, 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; + return -1; + } + +#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 */ +# if defined __CYGWIN__ + /* fp_->_offset is typed as an integer. */ + fp_->_offset = pos; +# else + /* fp_->_offset is an fpos_t. */ + { + /* Use a union, since on NetBSD, the compilation flags + determine whether fpos_t is typedef'd to off_t or a struct + containing a single off_t member. */ + union + { + fpos_t f; + off_t o; + } u; + u.o = pos; + fp_->_offset = u.f; + } +# endif + fp_->_flags |= __SOFF; + fp_->_flags &= ~__SEOF; +#elif defined __EMX__ /* emx+gcc */ + fp->_flags &= ~_IOEOF; +#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */ + fp->_flag &= ~_IOEOF; +#elif defined __MINT__ /* Atari FreeMiNT */ + fp->__offset = pos; + fp->__eof = 0; #endif - return 0; - } + /* If we were not requested to position beyond end of file, we're + done. */ + if (!(whence == SEEK_END && offset > 0)) + return 0; } - else - return fseeko (fp, offset, whence); + return fseeko (fp, offset, whence); }