Adding upstream version 5.2.37.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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1435 changed files with 757174 additions and 0 deletions
232
lib/sh/fpurge.c
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232
lib/sh/fpurge.c
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/* fpurge - Flushing buffers of a FILE stream. */
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/* Copyright (C) 2007-2020 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "stdc.h"
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#include <stdio.h>
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/* Specification. Same as in ../../externs.h. */
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#define NEED_FPURGE_DECL
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#if HAVE_FPURGE
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# define fpurge _bash_fpurge
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#endif
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extern int fpurge PARAMS((FILE *stream));
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#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */
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# include <stdio_ext.h>
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#endif
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#include <stdlib.h>
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/* Inline contents of gnulib:stdio-impl.h */
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/* Many stdio implementations have the same logic and therefore can share
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the same implementation of stdio extension API, except that some fields
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have different naming conventions, or their access requires some casts. */
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/* BSD stdio derived implementations. */
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#if defined __NetBSD__ /* NetBSD */
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/* Get __NetBSD_Version__. */
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# include <sys/param.h>
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#endif
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#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
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# if defined __DragonFly__ /* DragonFly */
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/* See <http://www.dragonflybsd.org/cvsweb/src/lib/libc/stdio/priv_stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */
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# define fp_ ((struct { struct __FILE_public pub; \
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struct { unsigned char *_base; int _size; } _bf; \
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void *cookie; \
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void *_close; \
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void *_read; \
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void *_seek; \
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void *_write; \
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struct { unsigned char *_base; int _size; } _ub; \
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int _ur; \
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unsigned char _ubuf[3]; \
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unsigned char _nbuf[1]; \
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struct { unsigned char *_base; int _size; } _lb; \
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int _blksize; \
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fpos_t _offset; \
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/* More fields, not relevant here. */ \
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} *) fp)
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/* See <http://www.dragonflybsd.org/cvsweb/src/include/stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */
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# define _p pub._p
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# define _flags pub._flags
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# define _r pub._r
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# define _w pub._w
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# else
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# define fp_ fp
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# endif
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# if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ /* NetBSD >= 1.5ZA, OpenBSD */
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/* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
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and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
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struct __sfileext
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{
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struct __sbuf _ub; /* ungetc buffer */
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/* More fields, not relevant here. */
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};
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# define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub
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# else /* FreeBSD, NetBSD <= 1.5Z, DragonFly, MacOS X, Cygwin */
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# define fp_ub fp_->_ub
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# endif
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# define HASUB(fp) (fp_ub._base != NULL)
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#endif
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/* SystemV derived implementations. */
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#if defined _IOERR
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# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
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# define fp_ ((struct { unsigned char *_ptr; \
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unsigned char *_base; \
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unsigned char *_end; \
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long _cnt; \
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int _file; \
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unsigned int _flag; \
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} *) fp)
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# else
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# define fp_ fp
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# endif
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# if defined _SCO_DS /* OpenServer */
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# define _cnt __cnt
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# define _ptr __ptr
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# define _base __base
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# define _flag __flag
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# endif
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#endif
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int
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fpurge (FILE *fp)
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{
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#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */
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__fpurge (fp);
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/* The __fpurge function does not have a return value. */
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return 0;
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#elif HAVE_FPURGE /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin 1.7 */
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/* Call the system's fpurge function. */
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# undef fpurge
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# if !HAVE_DECL_FPURGE
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extern int fpurge (FILE *);
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# endif
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int result = fpurge (fp);
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# if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
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if (result == 0)
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/* Correct the invariants that fpurge broke.
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<stdio.h> on BSD systems says:
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"The following always hold: if _flags & __SRD, _w is 0."
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If this invariant is not fulfilled and the stream is read-write but
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currently reading, subsequent putc or fputc calls will write directly
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into the buffer, although they shouldn't be allowed to. */
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if ((fp_->_flags & __SRD) != 0)
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fp_->_w = 0;
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# endif
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return result;
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#else
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/* Most systems provide FILE as a struct and the necessary bitmask in
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<stdio.h>, because they need it for implementing getc() and putc() as
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fast macros. */
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# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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fp->_IO_read_end = fp->_IO_read_ptr;
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fp->_IO_write_ptr = fp->_IO_write_base;
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/* Avoid memory leak when there is an active ungetc buffer. */
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if (fp->_IO_save_base != NULL)
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{
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free (fp->_IO_save_base);
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fp->_IO_save_base = NULL;
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}
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return 0;
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# elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
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fp_->_p = fp_->_bf._base;
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fp_->_r = 0;
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fp_->_w = ((fp_->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */
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? fp_->_bf._size
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: 0);
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/* Avoid memory leak when there is an active ungetc buffer. */
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if (fp_ub._base != NULL)
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{
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if (fp_ub._base != fp_->_ubuf)
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free (fp_ub._base);
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fp_ub._base = NULL;
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}
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return 0;
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# elif defined __EMX__ /* emx+gcc */
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fp->_ptr = fp->_buffer;
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fp->_rcount = 0;
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fp->_wcount = 0;
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fp->_ungetc_count = 0;
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return 0;
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# elif defined _IOERR || defined __TANDEM /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
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fp->_ptr = fp->_base;
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if (fp->_ptr != NULL)
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fp->_cnt = 0;
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return 0;
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# elif defined __UCLIBC__ /* uClibc */
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# ifdef __STDIO_BUFFERS
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if (fp->__modeflags & __FLAG_WRITING)
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fp->__bufpos = fp->__bufstart;
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else if (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING))
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fp->__bufpos = fp->__bufread;
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# endif
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return 0;
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# elif defined __QNX__ /* QNX */
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fp->_Rback = fp->_Back + sizeof (fp->_Back);
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fp->_Rsave = NULL;
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if (fp->_Mode & 0x2000 /* _MWRITE */)
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/* fp->_Buf <= fp->_Next <= fp->_Wend */
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fp->_Next = fp->_Buf;
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else
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/* fp->_Buf <= fp->_Next <= fp->_Rend */
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fp->_Rend = fp->_Next;
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return 0;
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# elif defined __MINT__ /* Atari FreeMiNT */
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if (fp->__pushed_back)
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{
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fp->__bufp = fp->__pushback_bufp;
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fp->__pushed_back = 0;
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}
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/* Preserve the current file position. */
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if (fp->__target != -1)
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fp->__target += fp->__bufp - fp->__buffer;
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fp->__bufp = fp->__buffer;
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/* Nothing in the buffer, next getc is nontrivial. */
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fp->__get_limit = fp->__bufp;
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/* Nothing in the buffer, next putc is nontrivial. */
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fp->__put_limit = fp->__buffer;
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return 0;
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# else
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# warning "Please port gnulib fpurge.c to your platform! Look at the definitions of fflush, setvbuf and ungetc on your system, then report this to bug-gnulib."
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return 0;
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# endif
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#endif
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}
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