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diff --git a/lib/sh/fpurge.c b/lib/sh/fpurge.c
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+/* fpurge - Flushing buffers of a FILE stream. */
+
+/* Copyright (C) 2007-2020 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash 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.
+
+ Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include "stdc.h"
+
+#include <stdio.h>
+
+/* Specification. Same as in ../../externs.h. */
+#define NEED_FPURGE_DECL
+#if HAVE_FPURGE
+# define fpurge _bash_fpurge
+#endif
+extern int fpurge PARAMS((FILE *stream));
+
+#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */
+# include <stdio_ext.h>
+#endif
+#include <stdlib.h>
+
+/* Inline contents of gnulib:stdio-impl.h */
+
+/* Many stdio implementations have the same logic and therefore can share
+ the same implementation of stdio extension API, except that some fields
+ have different naming conventions, or their access requires some casts. */
+
+/* BSD stdio derived implementations. */
+
+#if defined __NetBSD__ /* NetBSD */
+/* Get __NetBSD_Version__. */
+# include <sys/param.h>
+#endif
+
+#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+
+# if defined __DragonFly__ /* DragonFly */
+ /* See <http://www.dragonflybsd.org/cvsweb/src/lib/libc/stdio/priv_stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */
+# define fp_ ((struct { struct __FILE_public pub; \
+ struct { unsigned char *_base; int _size; } _bf; \
+ void *cookie; \
+ void *_close; \
+ void *_read; \
+ void *_seek; \
+ void *_write; \
+ struct { unsigned char *_base; int _size; } _ub; \
+ int _ur; \
+ unsigned char _ubuf[3]; \
+ unsigned char _nbuf[1]; \
+ struct { unsigned char *_base; int _size; } _lb; \
+ int _blksize; \
+ fpos_t _offset; \
+ /* More fields, not relevant here. */ \
+ } *) fp)
+ /* See <http://www.dragonflybsd.org/cvsweb/src/include/stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */
+# define _p pub._p
+# define _flags pub._flags
+# define _r pub._r
+# define _w pub._w
+# else
+# define fp_ fp
+# endif
+
+# if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ /* NetBSD >= 1.5ZA, OpenBSD */
+ /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
+ and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
+ struct __sfileext
+ {
+ struct __sbuf _ub; /* ungetc buffer */
+ /* More fields, not relevant here. */
+ };
+# define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub
+# else /* FreeBSD, NetBSD <= 1.5Z, DragonFly, MacOS X, Cygwin */
+# define fp_ub fp_->_ub
+# endif
+
+# define HASUB(fp) (fp_ub._base != NULL)
+
+#endif
+
+/* SystemV derived implementations. */
+
+#if defined _IOERR
+
+# 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)
+# else
+# define fp_ fp
+# endif
+
+# if defined _SCO_DS /* OpenServer */
+# define _cnt __cnt
+# define _ptr __ptr
+# define _base __base
+# define _flag __flag
+# endif
+
+#endif
+
+int
+fpurge (FILE *fp)
+{
+#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */
+
+ __fpurge (fp);
+ /* The __fpurge function does not have a return value. */
+ return 0;
+
+#elif HAVE_FPURGE /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin 1.7 */
+
+ /* Call the system's fpurge function. */
+# undef fpurge
+# if !HAVE_DECL_FPURGE
+ extern int fpurge (FILE *);
+# endif
+ int result = fpurge (fp);
+# if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+ if (result == 0)
+ /* Correct the invariants that fpurge broke.
+ <stdio.h> on BSD systems says:
+ "The following always hold: if _flags & __SRD, _w is 0."
+ If this invariant is not fulfilled and the stream is read-write but
+ currently reading, subsequent putc or fputc calls will write directly
+ into the buffer, although they shouldn't be allowed to. */
+ if ((fp_->_flags & __SRD) != 0)
+ fp_->_w = 0;
+# endif
+ return result;
+
+#else
+
+ /* Most systems provide FILE as a struct and the necessary bitmask in
+ <stdio.h>, because they need it for implementing getc() and putc() as
+ fast macros. */
+# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+ fp->_IO_read_end = fp->_IO_read_ptr;
+ fp->_IO_write_ptr = fp->_IO_write_base;
+ /* Avoid memory leak when there is an active ungetc buffer. */
+ if (fp->_IO_save_base != NULL)
+ {
+ free (fp->_IO_save_base);
+ fp->_IO_save_base = NULL;
+ }
+ return 0;
+# elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+ 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);
+ /* Avoid memory leak when there is an active ungetc buffer. */
+ if (fp_ub._base != NULL)
+ {
+ if (fp_ub._base != fp_->_ubuf)
+ free (fp_ub._base);
+ fp_ub._base = NULL;
+ }
+ return 0;
+# elif defined __EMX__ /* emx+gcc */
+ fp->_ptr = fp->_buffer;
+ fp->_rcount = 0;
+ fp->_wcount = 0;
+ fp->_ungetc_count = 0;
+ return 0;
+# elif defined _IOERR || defined __TANDEM /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
+ fp->_ptr = fp->_base;
+ if (fp->_ptr != NULL)
+ fp->_cnt = 0;
+ return 0;
+# elif defined __UCLIBC__ /* uClibc */
+# ifdef __STDIO_BUFFERS
+ if (fp->__modeflags & __FLAG_WRITING)
+ fp->__bufpos = fp->__bufstart;
+ else if (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING))
+ fp->__bufpos = fp->__bufread;
+# endif
+ return 0;
+# elif defined __QNX__ /* QNX */
+ fp->_Rback = fp->_Back + sizeof (fp->_Back);
+ fp->_Rsave = NULL;
+ if (fp->_Mode & 0x2000 /* _MWRITE */)
+ /* fp->_Buf <= fp->_Next <= fp->_Wend */
+ fp->_Next = fp->_Buf;
+ else
+ /* fp->_Buf <= fp->_Next <= fp->_Rend */
+ fp->_Rend = fp->_Next;
+ return 0;
+# elif defined __MINT__ /* Atari FreeMiNT */
+ if (fp->__pushed_back)
+ {
+ fp->__bufp = fp->__pushback_bufp;
+ fp->__pushed_back = 0;
+ }
+ /* Preserve the current file position. */
+ if (fp->__target != -1)
+ fp->__target += fp->__bufp - fp->__buffer;
+ fp->__bufp = fp->__buffer;
+ /* Nothing in the buffer, next getc is nontrivial. */
+ fp->__get_limit = fp->__bufp;
+ /* Nothing in the buffer, next putc is nontrivial. */
+ fp->__put_limit = fp->__buffer;
+ return 0;
+# else
+# 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."
+ return 0;
+# endif
+
+#endif
+}