/* Retrieve information about a FILE stream. Copyright (C) 2007-2024 Free Software Foundation, Inc. This file 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 of the License, or (at your option) any later version. This file 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, see . */ #include /* Specification. */ #include "freading.h" #include "stdio-impl.h" /* Don't use glibc's __freading function in glibc < 2.7, see */ #if !(HAVE___FREADING && (!defined __GLIBC__ || defined __UCLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))) bool freading (FILE *fp) { /* Most systems provide FILE as a struct and the necessary bitmask in , because they need it for implementing getc() and putc() as fast macros. */ # if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ return ((fp->_flags & _IO_NO_WRITES) != 0 || ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0 && fp->_IO_read_base != NULL)); # elif defined __sferror || defined __DragonFly__ || defined __ANDROID__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin < 1.7.34, Minix 3, Android */ return (fp_->_flags & __SRD) != 0; # elif defined __EMX__ /* emx+gcc */ return (fp->_flags & _IOREAD) != 0; # elif defined __minix /* Minix */ return (fp->_flags & _IOREADING) != 0; # elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */ # if defined __sun /* Solaris */ return (fp_->_flag & _IOREAD) != 0 && (fp_->_flag & _IOWRT) == 0; # else return (fp_->_flag & _IOREAD) != 0; # endif # elif defined __UCLIBC__ /* uClibc */ return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0; # elif defined __QNX__ /* QNX */ return ((fp->_Mode & 0x2 /* _MOPENW */) == 0 || (fp->_Mode & 0x1000 /* _MREAD */) != 0); # elif defined __MINT__ /* Atari FreeMiNT */ if (!fp->__mode.__write) return 1; if (!fp->__mode.__read) return 0; # ifdef _IO_CURRENTLY_GETTING /* Flag added on 2009-02-28 */ return (fp->__flags & _IO_CURRENTLY_GETTING) != 0; # else return (fp->__buffer < fp->__get_limit /*|| fp->__bufp == fp->__put_limit ??*/); # endif # elif defined EPLAN9 /* Plan9 */ if (fp->state == 0 /* CLOSED */ || fp->state == 4 /* WR */) return 0; return (fp->state == 3 /* RD */ && (fp->bufl == 0 || fp->rp < fp->wp)); # else # error "Please port gnulib freading.c to your platform!" # endif } #endif