Mercurial > gnulib
view lib/freadahead.c @ 9978:97187909b8c9
Fix indentation.
author | Bruno Haible <bruno@clisp.org> |
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date | Sat, 26 Apr 2008 16:48:23 +0200 |
parents | 9a02133ad731 |
children | 2c1ba629f5d5 |
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/* Retrieve information about a FILE stream. Copyright (C) 2007-2008 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 the Free Software Foundation; either version 3 of the License, 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include "freadahead.h" size_t freadahead (FILE *fp) { #if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */ if (fp->_IO_write_ptr > fp->_IO_write_base) return 0; return (fp->_IO_read_end - fp->_IO_read_ptr) + (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base : 0); #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */ # if defined __NetBSD__ || defined __OpenBSD__ struct __sfileext { struct __sbuf _ub; /* ungetc buffer */ /* More fields, not relevant here. */ }; # define HASUB(fp) (((struct __sfileext *) (fp)->_ext._base)->_ub._base != NULL) # else # define HASUB(fp) ((fp)->_ub._base != NULL) # endif if ((fp->_flags & __SWR) != 0 || fp->_r < 0) return 0; return fp->_r + (HASUB (fp) ? fp->_ur : 0); #elif defined __EMX__ /* emx+gcc */ if ((fp->_flags & _IOWRT) != 0) return 0; /* Note: fp->_ungetc_count > 0 implies fp->_rcount <= 0, fp->_ungetc_count = 0 implies fp->_rcount >= 0. */ /* equivalent to (fp->_ungetc_count == 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount) */ return (fp->_rcount > 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount); #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, 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_->_flag & _IOWRT) != 0) return 0; return fp_->_cnt; # else # if defined _SCO_DS /* OpenServer */ # define _flag __flag # define _cnt __cnt # endif if ((fp->_flag & _IOWRT) != 0) return 0; return fp->_cnt; # endif #elif defined __UCLIBC__ /* uClibc */ # ifdef __STDIO_BUFFERS if (fp->__modeflags & __FLAG_WRITING) return 0; return (fp->__bufread - fp->__bufpos) + (fp->__modeflags & __FLAG_UNGOT ? 1 : 0); # else return 0; # endif #elif defined __QNX__ /* QNX */ if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0) return 0; /* fp->_Buf <= fp->_Next <= fp->_Rend, and fp->_Rend may be overridden by fp->_Rsave. */ return ((fp->_Rsave ? fp->_Rsave : fp->_Rend) - fp->_Next) + (fp->_Mode & 0x4000 /* _MBYTE */ ? (fp->_Back + sizeof (fp->_Back)) - fp->_Rback : 0); #else #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib." #endif }