Adding upstream version 5.2.15.upstream/5.2.15upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

22 files changed, 2517 insertions, 0 deletions

diff --git a/include/ansi_stdlib.h b/include/ansi_stdlib.h
new file mode 100644
index 0000000..7dc2ee0
--- /dev/null
+++ b/include/ansi_stdlib.h
@@ -0,0 +1,54 @@
+/* ansi_stdlib.h -- An ANSI Standard stdlib.h. */
+/* A minimal stdlib.h containing extern declarations for those functions
+   that bash uses. */
+
+/* Copyright (C) 1993 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/>.
+*/
+
+#if !defined (_STDLIB_H_)
+#define	_STDLIB_H_ 1
+
+/* String conversion functions. */
+extern int atoi ();
+
+extern double atof ();
+extern double strtod ();
+
+/* Memory allocation functions. */
+/* Generic pointer type. */
+#ifndef PTR_T
+
+#if defined (__STDC__)
+#  define PTR_T	void *
+#else
+#  define PTR_T char *
+#endif
+
+#endif /* PTR_T */
+
+extern PTR_T malloc ();
+extern PTR_T realloc ();
+extern void free ();
+
+/* Other miscellaneous functions. */
+extern void abort ();
+extern void exit ();
+extern char *getenv ();
+extern void qsort ();
+
+#endif /* _STDLIB_H  */
diff --git a/include/chartypes.h b/include/chartypes.h
new file mode 100644
index 0000000..d5be4a3
--- /dev/null
+++ b/include/chartypes.h
@@ -0,0 +1,109 @@
+/* chartypes.h -- extend ctype.h */
+
+/* Copyright (C) 2001-2021 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/>.
+*/
+
+#ifndef _SH_CHARTYPES_H
+#define _SH_CHARTYPES_H
+
+#include <ctype.h>
+
+#ifndef UCHAR_MAX
+#  define UCHAR_MAX 255
+#endif
+#ifndef CHAR_MAX
+#  define CHAR_MAX 127
+#endif
+
+/* use this as a proxy for C89 */
+#if defined (HAVE_STDLIB_H) && defined (HAVE_STRING_H)
+#  define IN_CTYPE_DOMAIN(c) 1
+#else
+#  define IN_CTYPE_DOMAIN(c) ((c) >= 0 && (c) <= CHAR_MAX)
+#endif
+
+#if !defined (isspace) && !defined (HAVE_ISSPACE)
+#  define isspace(c) ((c) == ' ' || (c) == '\t' || (c) == '\n' || (c) == '\f')
+#endif
+
+#if !defined (isprint) && !defined (HAVE_ISPRINT)
+#  define isprint(c) (isalpha((unsigned char)c) || isdigit((unsigned char)c) || ispunct((unsigned char)c))
+#endif
+
+#if defined (isblank) || defined (HAVE_ISBLANK)
+#  define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank ((unsigned char)c))
+#else
+#  define ISBLANK(c) ((c) == ' ' || (c) == '\t')
+#endif
+
+#if defined (isgraph) || defined (HAVE_ISGRAPH)
+#  define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (c))
+#else
+#  define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint ((unsigned char)c) && !isspace ((unsigned char)c))
+#endif
+
+#if !defined (isxdigit) && !defined (HAVE_ISXDIGIT)
+#  define isxdigit(c)	(((c) >= '0' && (c) <= '9') || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F'))
+#endif
+
+#undef ISPRINT
+
+#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint ((unsigned char)c))
+#define ISDIGIT(c) (IN_CTYPE_DOMAIN (c) && isdigit ((unsigned char)c))
+#define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum ((unsigned char)c))
+#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha ((unsigned char)c))
+#define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl ((unsigned char)c))
+#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower ((unsigned char)c))
+#define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct ((unsigned char)c))
+#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace ((unsigned char)c))
+#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper ((unsigned char)c))
+#define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit ((unsigned char)c))
+
+#define ISLETTER(c)	(ISALPHA(c))
+
+#define DIGIT(c)	((c) >= '0' && (c) <= '9')
+
+#define ISWORD(c)	(ISLETTER(c) || DIGIT(c) || ((c) == '_'))
+
+#define HEXVALUE(c) \
+  (((c) >= 'a' && (c) <= 'f') \
+	? (c)-'a'+10 \
+	: (c) >= 'A' && (c) <= 'F' ? (c)-'A'+10 : (c)-'0')
+                  
+#ifndef ISOCTAL
+#  define ISOCTAL(c)	((c) >= '0' && (c) <= '7')
+#endif
+#define OCTVALUE(c)	((c) - '0')
+
+#define TODIGIT(c)	((c) - '0')
+#define TOCHAR(c)	((c) + '0')
+
+#define TOLOWER(c)	(ISUPPER(c) ? tolower(c) : (c))
+#define TOUPPER(c)	(ISLOWER(c) ? toupper(c) : (c))
+
+#ifndef TOCTRL
+   /* letter to control char -- ASCII.  The TOUPPER is in there so \ce and
+      \cE will map to the same character in $'...' expansions. */
+#  define TOCTRL(x)	((x) == '?' ? 0x7f : (TOUPPER(x) & 0x1f))
+#endif
+#ifndef UNCTRL
+   /* control char to letter -- ASCII */
+#  define UNCTRL(x)	(TOUPPER(x ^ 0x40))
+#endif
+
+#endif /* _SH_CHARTYPES_H */
diff --git a/include/filecntl.h b/include/filecntl.h
new file mode 100644
index 0000000..9bcbab8
--- /dev/null
+++ b/include/filecntl.h
@@ -0,0 +1,53 @@
+/* filecntl.h - Definitions to set file descriptors to close-on-exec. */
+
+/* Copyright (C) 1993 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/>.
+*/
+
+#if !defined (_FILECNTL_H_)
+#define _FILECNTL_H_
+
+#include <fcntl.h>
+
+/* Definitions to set file descriptors to close-on-exec, the Posix way. */
+#if !defined (FD_CLOEXEC)
+#define FD_CLOEXEC     1
+#endif
+
+#define FD_NCLOEXEC    0
+
+#define SET_CLOSE_ON_EXEC(fd)  (fcntl ((fd), F_SETFD, FD_CLOEXEC))
+#define SET_OPEN_ON_EXEC(fd)   (fcntl ((fd), F_SETFD, FD_NCLOEXEC))
+
+/* How to open a file in non-blocking mode, the Posix.1 way. */
+#if !defined (O_NONBLOCK)
+#  if defined (O_NDELAY)
+#    define O_NONBLOCK O_NDELAY
+#  else
+#    define O_NONBLOCK 0
+#  endif
+#endif
+
+/* Make sure O_BINARY and O_TEXT are defined to avoid Windows-specific code. */
+#if !defined (O_BINARY)
+#  define O_BINARY 0
+#endif
+#if !defined (O_TEXT)
+#  define O_TEXT 0
+#endif
+
+#endif /* ! _FILECNTL_H_ */
diff --git a/include/gettext.h b/include/gettext.h
new file mode 100644
index 0000000..97a1f36
--- /dev/null
+++ b/include/gettext.h
@@ -0,0 +1,70 @@
+/* Convenience header for conditional use of GNU <libintl.h>.
+   Copyright (C) 1995-1998, 2000-2002, 2008,2009 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/>.
+*/
+
+#ifndef _LIBGETTEXT_H
+#define _LIBGETTEXT_H 1
+
+/* NLS can be disabled through the configure --disable-nls option.  */
+#if ENABLE_NLS
+
+/* Get declarations of GNU message catalog functions.  */
+# include <libintl.h>
+
+#else
+
+/* Solaris /usr/include/locale.h includes /usr/include/libintl.h, which
+   chokes if dcgettext is defined as a macro.  So include it now, to make
+   later inclusions of <locale.h> a NOP.  We don't include <libintl.h>
+   as well because people using "gettext.h" will not include <libintl.h>,
+   and also including <libintl.h> would fail on SunOS 4, whereas <locale.h>
+   is OK.  */
+#if defined(__sun)
+# include <locale.h>
+#endif
+
+/* Disabled NLS.
+   The casts to 'const char *' serve the purpose of producing warnings
+   for invalid uses of the value returned from these functions.
+   On pre-ANSI systems without 'const', the config.h file is supposed to
+   contain "#define const".  */
+# define gettext(Msgid) ((const char *) (Msgid))
+# define dgettext(Domainname, Msgid) ((const char *) (Msgid))
+# define dcgettext(Domainname, Msgid, Category) ((const char *) (Msgid))
+# define ngettext(Msgid1, Msgid2, N) \
+    ((N) == 1 ? (const char *) (Msgid1) : (const char *) (Msgid2))
+# define dngettext(Domainname, Msgid1, Msgid2, N) \
+    ((N) == 1 ? (const char *) (Msgid1) : (const char *) (Msgid2))
+# define dcngettext(Domainname, Msgid1, Msgid2, N, Category) \
+    ((N) == 1 ? (const char *) (Msgid1) : (const char *) (Msgid2))
+# define textdomain(Domainname) ((const char *) (Domainname))
+# define bindtextdomain(Domainname, Dirname) ((const char *) (Dirname))
+# define bind_textdomain_codeset(Domainname, Codeset) ((const char *) (Codeset))
+
+#endif
+
+/* A pseudo function call that serves as a marker for the automated
+   extraction of messages, but does not call gettext().  The run-time
+   translation is done at a different place in the code.
+   The argument, String, should be a literal string.  Concatenated strings
+   and other string expressions won't work.
+   The macro's expansion is not parenthesized, so that it is suitable as
+   initializer for static 'char[]' or 'const char[]' variables.  */
+#define gettext_noop(String) String
+
+#endif /* _LIBGETTEXT_H */
diff --git a/include/maxpath.h b/include/maxpath.h
new file mode 100644
index 0000000..db2e1fb
--- /dev/null
+++ b/include/maxpath.h
@@ -0,0 +1,75 @@
+/* maxpath.h - Find out what this system thinks PATH_MAX and NAME_MAX are. */
+
+/* Copyright (C) 1993 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/>.
+*/
+
+#if !defined (_MAXPATH_H_)
+#define _MAXPATH_H_
+
+/* These values are supposed to be in <limits.h> or one of the files
+   it includes. */
+#if defined (HAVE_LIMITS_H)
+#  include <limits.h>
+#endif /* !HAVE_LIMITS_H */
+
+/* If PATH_MAX is not defined, look for MAXPATHLEN */
+#if !defined (PATH_MAX)
+#  if defined (HAVE_SYS_PARAM_H)
+#    include <sys/param.h>
+#    define maxpath_param_h
+#  endif
+#  if defined (MAXPATHLEN) && !defined (PATH_MAX)
+#    define PATH_MAX MAXPATHLEN
+#  endif /* MAXPATHLEN && !PATH_MAX */
+#endif /* !PATH_MAX */
+
+/* If NAME_MAX is not defined, look for MAXNAMLEN */
+#if !defined (NAME_MAX)
+#  if defined (HAVE_SYS_PARAM_H) && !defined (maxpath_param_h)
+#    include <sys/param.h>
+#  endif
+#  if defined (MAXNAMLEN) && !defined (NAME_MAX)
+#    define NAME_MAX MAXNAMLEN
+#  endif /* MAXNAMLEN && !NAME_MAX */
+#endif /* !NAME_MAX */
+
+/* Default POSIX values */
+#if !defined (PATH_MAX) && defined (_POSIX_PATH_MAX)
+#  define PATH_MAX _POSIX_PATH_MAX
+#endif
+
+#if !defined (NAME_MAX) && defined (_POSIX_NAME_MAX)
+#  define NAME_MAX _POSIX_NAME_MAX
+#endif
+
+
+/* Default values */
+#if !defined (PATH_MAX)
+#  define PATH_MAX 1024
+#endif
+
+#if !defined (NAME_MAX)
+#  define NAME_MAX 14
+#endif
+
+#if PATH_MAX < 1024
+#  undef PATH_MAX
+#  define PATH_MAX 1024
+#endif
+
+#endif /* _MAXPATH_H_ */
diff --git a/include/memalloc.h b/include/memalloc.h
new file mode 100644
index 0000000..57318b9
--- /dev/null
+++ b/include/memalloc.h
@@ -0,0 +1,62 @@
+/* memalloc.h -- consolidate code for including alloca.h or malloc.h and
+   defining alloca. */
+
+/* Copyright (C) 1993 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/>.
+*/
+
+#if !defined (_MEMALLOC_H_)
+#  define _MEMALLOC_H_
+
+#if defined (sparc) && defined (sun) && !defined (HAVE_ALLOCA_H)
+#  define HAVE_ALLOCA_H
+#endif
+
+#if defined (__GNUC__) && !defined (HAVE_ALLOCA)
+#  define HAVE_ALLOCA
+#endif
+
+#if defined (HAVE_ALLOCA_H) && !defined (HAVE_ALLOCA) && !defined (C_ALLOCA)
+#  define HAVE_ALLOCA
+#endif /* HAVE_ALLOCA_H && !HAVE_ALLOCA */
+
+#if defined (__GNUC__) && !defined (C_ALLOCA)
+#  undef alloca
+#  define alloca __builtin_alloca
+#else /* !__GNUC__ || C_ALLOCA */
+#  if defined (HAVE_ALLOCA_H) && !defined (C_ALLOCA)
+#    if defined (IBMESA)
+#      include <malloc.h>
+#    else /* !IBMESA */
+#      include <alloca.h>
+#    endif /* !IBMESA */
+#  else  /* !HAVE_ALLOCA_H || C_ALLOCA */
+#    if defined (__hpux) && defined (__STDC__) && !defined (alloca)
+extern void *alloca ();
+#    else
+#      if !defined (alloca)
+#        if defined (__STDC__)
+extern void *alloca (size_t);
+#        else
+extern char *alloca ();
+#        endif /* !__STDC__ */
+#      endif /* !alloca */
+#    endif /* !__hpux || !__STDC__ && !alloca */
+#  endif /* !HAVE_ALLOCA_H || C_ALLOCA */
+#endif /* !__GNUC__ || C_ALLOCA */
+
+#endif /* _MEMALLOC_H_ */
diff --git a/include/ocache.h b/include/ocache.h
new file mode 100644
index 0000000..c596c27
--- /dev/null
+++ b/include/ocache.h
@@ -0,0 +1,133 @@
+/* ocache.h -- a minimal object caching implementation. */
+
+/* Copyright (C) 2002 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/>.
+*/
+
+#if !defined (_OCACHE_H_)
+#define	_OCACHE_H_ 1
+
+#ifndef PTR_T
+
+#if defined (__STDC__)
+#  define PTR_T void *
+#else
+#  define PTR_T char *
+#endif
+
+#endif /* PTR_T */
+
+#define OC_MEMSET(memp, xch, nbytes)					\
+do {									\
+  if ((nbytes) <= 32) {							\
+    register char * mzp = (char *)(memp);				\
+    unsigned long mctmp = (nbytes);					\
+    register long mcn;							\
+    if (mctmp < 8) mcn = 0; else { mcn = (mctmp-1)/8; mctmp &= 7; }	\
+    switch (mctmp) {							\
+      case 0: for(;;) { *mzp++ = xch;					\
+      case 7:	   *mzp++ = xch;					\
+      case 6:	   *mzp++ = xch;					\
+      case 5:	   *mzp++ = xch;					\
+      case 4:	   *mzp++ = xch;					\
+      case 3:	   *mzp++ = xch;					\
+      case 2:	   *mzp++ = xch;					\
+      case 1:	   *mzp++ = xch; if(mcn <= 0) break; mcn--; }		\
+    }									\
+  } else								\
+    memset ((memp), (xch), (nbytes));					\
+} while(0)
+
+typedef struct objcache {
+	PTR_T	data;
+	int	cs;		/* cache size, number of objects */
+	int	nc;		/* number of cache entries */
+} sh_obj_cache_t;
+
+/* Create an object cache C of N pointers to OTYPE. */
+#define ocache_create(c, otype, n) \
+	do { \
+		(c).data = xmalloc((n) * sizeof (otype *)); \
+		(c).cs = (n); \
+		(c).nc = 0; \
+	} while (0)
+
+/* Destroy an object cache C. */
+#define ocache_destroy(c) \
+	do { \
+		if ((c).data) \
+			xfree ((c).data); \
+		(c).data = 0; \
+		(c).cs = (c).nc = 0; \
+	} while (0)
+
+/* Free all cached items, which are pointers to OTYPE, in object cache C. */
+#define ocache_flush(c, otype) \
+	do { \
+		while ((c).nc > 0) \
+			xfree (((otype **)((c).data))[--(c).nc]); \
+	} while (0)
+
+/*
+ * Allocate a new item of type pointer to OTYPE, using data from object
+ * cache C if any cached items exist, otherwise calling xmalloc.  Return
+ * the object in R.
+ */
+#define ocache_alloc(c, otype, r) \
+	do { \
+		if ((c).nc > 0) { \
+			(r) = (otype *)((otype **)((c).data))[--(c).nc]; \
+		} else \
+			(r) = (otype *)xmalloc (sizeof (otype)); \
+	} while (0)
+
+/*
+ * Free an item R of type pointer to OTYPE, adding to object cache C if
+ * there is room and calling xfree if the cache is full.  If R is added
+ * to the object cache, the contents are scrambled.
+ */
+#define ocache_free(c, otype, r) \
+	do { \
+		if ((c).nc < (c).cs) { \
+			OC_MEMSET ((r), 0xdf, sizeof(otype)); \
+			((otype **)((c).data))[(c).nc++] = (r); \
+		} else \
+			xfree (r); \
+	} while (0)
+
+/*
+ * One may declare and use an object cache as (for instance):
+ *
+ *	sh_obj_cache_t wdcache = {0, 0, 0};
+ *	sh_obj_cache_t wlcache = {0, 0, 0};
+ *
+ *	ocache_create(wdcache, WORD_DESC, 30);
+ *	ocache_create(wlcache, WORD_LIST, 30);
+ *
+ *	WORD_DESC *wd;
+ *	ocache_alloc (wdcache, WORD_DESC, wd);
+ *
+ *	WORD_LIST *wl;
+ *	ocache_alloc (wlcache, WORD_LIST, wl);
+ *
+ *	ocache_free(wdcache, WORD_DESC, wd);
+ *	ocache_free(wlcache, WORD_LIST, wl);
+ *
+ * The use is almost arbitrary.
+ */
+
+#endif /* _OCACHE_H  */
diff --git a/include/posixdir.h b/include/posixdir.h
new file mode 100644
index 0000000..b737bd7
--- /dev/null
+++ b/include/posixdir.h
@@ -0,0 +1,71 @@
+/* posixdir.h -- Posix directory reading includes and defines. */
+
+/* Copyright (C) 1987,1991,2012,2019,2021 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/>.
+*/
+
+/* This file should be included instead of <dirent.h> or <sys/dir.h>. */
+
+#if !defined (_POSIXDIR_H_)
+#define _POSIXDIR_H_
+
+#if defined (HAVE_DIRENT_H)
+#  include <dirent.h>
+#  if defined (HAVE_STRUCT_DIRENT_D_NAMLEN)
+#    define D_NAMLEN(d)	((d)->d_namlen)
+#  else
+#    define D_NAMLEN(d)   (strlen ((d)->d_name))
+#  endif /* !HAVE_STRUCT_DIRENT_D_NAMLEN */
+#else
+#  if defined (HAVE_SYS_NDIR_H)
+#    include <sys/ndir.h>
+#  endif
+#  if defined (HAVE_SYS_DIR_H)
+#    include <sys/dir.h>
+#  endif
+#  if defined (HAVE_NDIR_H)
+#    include <ndir.h>
+#  endif
+#  if !defined (dirent)
+#    define dirent direct
+#  endif /* !dirent */
+#  define D_NAMLEN(d)   ((d)->d_namlen)
+#endif /* !HAVE_DIRENT_H */
+
+/* The bash code fairly consistently uses d_fileno; make sure it's available */
+#if defined (HAVE_STRUCT_DIRENT_D_INO) && !defined (HAVE_STRUCT_DIRENT_D_FILENO)
+#  define d_fileno d_ino
+#endif
+
+/* Posix does not require that the d_ino field be present, and some
+   systems do not provide it. */
+#if !defined (HAVE_STRUCT_DIRENT_D_INO) || defined (BROKEN_DIRENT_D_INO)
+#  define REAL_DIR_ENTRY(dp) 1
+#else
+#  define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
+#endif /* _POSIX_SOURCE */
+
+#if defined (HAVE_STRUCT_DIRENT_D_INO) && !defined (BROKEN_DIRENT_D_INO)
+#  define D_INO_AVAILABLE
+#endif
+
+/* Signal the rest of the code that it can safely use dirent.d_fileno */
+#if defined (D_INO_AVAILABLE) || defined (HAVE_STRUCT_DIRENT_D_FILENO)
+#  define D_FILENO_AVAILABLE 1
+#endif
+
+#endif /* !_POSIXDIR_H_ */
diff --git a/include/posixjmp.h b/include/posixjmp.h
new file mode 100644
index 0000000..9c7e99e
--- /dev/null
+++ b/include/posixjmp.h
@@ -0,0 +1,46 @@
+/* posixjmp.h -- wrapper for setjmp.h with changes for POSIX systems. */
+
+/* Copyright (C) 1987,1991-2015 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/>.
+*/
+
+#ifndef _POSIXJMP_H_
+#define _POSIXJMP_H_
+
+#include <setjmp.h>
+
+/* This *must* be included *after* config.h */
+
+#if defined (HAVE_POSIX_SIGSETJMP)
+#  define procenv_t	sigjmp_buf
+
+#  define setjmp_nosigs(x)	sigsetjmp((x), 0)
+#  define setjmp_sigs(x)	sigsetjmp((x), 1)
+
+#  define _rl_longjmp(x, n)	siglongjmp((x), (n))
+#  define sh_longjmp(x, n)	siglongjmp((x), (n))
+#else
+#  define procenv_t	jmp_buf
+
+#  define setjmp_nosigs		setjmp
+#  define setjmp_sigs		setjmp
+
+#  define _rl_longjmp(x, n)	longjmp((x), (n))
+#  define sh_longjmp(x, n)	longjmp((x), (n))
+#endif
+
+#endif /* _POSIXJMP_H_ */
diff --git a/include/posixselect.h b/include/posixselect.h
new file mode 100644
index 0000000..da6a1ac
--- /dev/null
+++ b/include/posixselect.h
@@ -0,0 +1,47 @@
+/* posixselect.h -- wrapper for select(2) includes and definitions */
+
+/* Copyright (C) 2009 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/>.
+*/
+
+#ifndef _POSIXSELECT_H_
+#define _POSIXSELECT_H_
+
+#if defined (FD_SET) && !defined (HAVE_SELECT)
+#  define HAVE_SELECT 1
+#endif
+
+#if defined (HAVE_SELECT)
+#  if !defined (HAVE_SYS_SELECT_H) || !defined (M_UNIX)
+#    include <sys/time.h>
+#  endif
+#endif /* HAVE_SELECT */
+#if defined (HAVE_SYS_SELECT_H)
+#  include <sys/select.h>
+#endif
+
+#ifndef USEC_PER_SEC
+#  define USEC_PER_SEC 1000000
+#endif
+
+#define USEC_TO_TIMEVAL(us, tv) \
+do { \
+  (tv).tv_sec = (us) / USEC_PER_SEC; \
+  (tv).tv_usec = (us) % USEC_PER_SEC; \
+} while (0)
+
+#endif /* _POSIXSELECT_H_ */
diff --git a/include/posixstat.h b/include/posixstat.h
new file mode 100644
index 0000000..b607786
--- /dev/null
+++ b/include/posixstat.h
@@ -0,0 +1,162 @@
+/* posixstat.h -- Posix stat(2) definitions for systems that
+   don't have them. */
+
+/* Copyright (C) 1987-2019 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/>.
+*/
+
+/* This file should be included instead of <sys/stat.h>.
+   It relies on the local sys/stat.h to work though. */
+#if !defined (_POSIXSTAT_H_)
+#define _POSIXSTAT_H_
+
+#include <sys/stat.h>
+
+#if defined (STAT_MACROS_BROKEN)
+#  undef S_ISBLK
+#  undef S_ISCHR
+#  undef S_ISDIR
+#  undef S_ISFIFO
+#  undef S_ISREG
+#  undef S_ISLNK
+#endif /* STAT_MACROS_BROKEN */
+
+/* These are guaranteed to work only on isc386 */
+#if !defined (S_IFDIR) && !defined (S_ISDIR)
+#  define S_IFDIR 0040000
+#endif /* !S_IFDIR && !S_ISDIR */
+#if !defined (S_IFMT)
+#  define S_IFMT  0170000
+#endif /* !S_IFMT */
+
+/* Posix 1003.1 5.6.1.1 <sys/stat.h> file types */
+
+/* Some Posix-wannabe systems define _S_IF* macros instead of S_IF*, but
+   do not provide the S_IS* macros that Posix requires. */
+
+#if defined (_S_IFMT) && !defined (S_IFMT)
+#define S_IFMT _S_IFMT
+#endif
+#if defined (_S_IFIFO) && !defined (S_IFIFO)
+#define S_IFIFO _S_IFIFO
+#endif
+#if defined (_S_IFCHR) && !defined (S_IFCHR)
+#define S_IFCHR _S_IFCHR
+#endif
+#if defined (_S_IFDIR) && !defined (S_IFDIR)
+#define S_IFDIR _S_IFDIR
+#endif
+#if defined (_S_IFBLK) && !defined (S_IFBLK)
+#define S_IFBLK _S_IFBLK
+#endif
+#if defined (_S_IFREG) && !defined (S_IFREG)
+#define S_IFREG _S_IFREG
+#endif
+#if defined (_S_IFLNK) && !defined (S_IFLNK)
+#define S_IFLNK _S_IFLNK
+#endif
+#if defined (_S_IFSOCK) && !defined (S_IFSOCK)
+#define S_IFSOCK _S_IFSOCK
+#endif
+
+/* Test for each symbol individually and define the ones necessary (some
+   systems claiming Posix compatibility define some but not all). */
+
+#if defined (S_IFBLK) && !defined (S_ISBLK)
+#define	S_ISBLK(m)	(((m)&S_IFMT) == S_IFBLK)	/* block device */
+#endif
+
+#if defined (S_IFCHR) && !defined (S_ISCHR)
+#define	S_ISCHR(m)	(((m)&S_IFMT) == S_IFCHR)	/* character device */
+#endif
+
+#if defined (S_IFDIR) && !defined (S_ISDIR)
+#define	S_ISDIR(m)	(((m)&S_IFMT) == S_IFDIR)	/* directory */
+#endif
+
+#if defined (S_IFREG) && !defined (S_ISREG)
+#define	S_ISREG(m)	(((m)&S_IFMT) == S_IFREG)	/* file */
+#endif
+
+#if defined (S_IFIFO) && !defined (S_ISFIFO)
+#define	S_ISFIFO(m)	(((m)&S_IFMT) == S_IFIFO)	/* fifo - named pipe */
+#endif
+
+#if defined (S_IFLNK) && !defined (S_ISLNK)
+#define	S_ISLNK(m)	(((m)&S_IFMT) == S_IFLNK)	/* symbolic link */
+#endif
+
+#if defined (S_IFSOCK) && !defined (S_ISSOCK)
+#define	S_ISSOCK(m)	(((m)&S_IFMT) == S_IFSOCK)	/* socket */
+#endif
+
+/*
+ * POSIX 1003.1 5.6.1.2 <sys/stat.h> File Modes
+ */
+
+#if !defined (S_IRWXU)
+#  if !defined (S_IREAD)
+#    define S_IREAD	00400
+#    define S_IWRITE	00200
+#    define S_IEXEC	00100
+#  endif /* S_IREAD */
+
+#  if !defined (S_IRUSR)
+#    define S_IRUSR	S_IREAD			/* read, owner */
+#    define S_IWUSR	S_IWRITE		/* write, owner */
+#    define S_IXUSR	S_IEXEC			/* execute, owner */
+
+#    define S_IRGRP	(S_IREAD  >> 3)		/* read, group */
+#    define S_IWGRP	(S_IWRITE >> 3)		/* write, group */
+#    define S_IXGRP	(S_IEXEC  >> 3)		/* execute, group */
+
+#    define S_IROTH	(S_IREAD  >> 6)		/* read, other */
+#    define S_IWOTH	(S_IWRITE >> 6)		/* write, other */
+#    define S_IXOTH	(S_IEXEC  >> 6)		/* execute, other */
+#  endif /* !S_IRUSR */
+
+#  define S_IRWXU	(S_IRUSR | S_IWUSR | S_IXUSR)
+#  define S_IRWXG	(S_IRGRP | S_IWGRP | S_IXGRP)
+#  define S_IRWXO	(S_IROTH | S_IWOTH | S_IXOTH)
+#else /* !S_IRWXU */
+  /* S_IRWXU is defined, but "group" and "other" bits might not be
+     (happens in certain versions of MinGW).  */
+#  if !defined (S_IRGRP)
+#    define S_IRGRP	(S_IREAD  >> 3)		/* read, group */
+#    define S_IWGRP	(S_IWRITE >> 3)		/* write, group */
+#    define S_IXGRP	(S_IEXEC  >> 3)		/* execute, group */
+#  endif /* !S_IRGRP */
+
+#  if !defined (S_IROTH)
+#    define S_IROTH	(S_IREAD  >> 6)		/* read, other */
+#    define S_IWOTH	(S_IWRITE >> 6)		/* write, other */
+#    define S_IXOTH	(S_IEXEC  >> 6)		/* execute, other */
+#  endif /* !S_IROTH */
+#  if !defined (S_IRWXG)
+#    define S_IRWXG	(S_IRGRP | S_IWGRP | S_IXGRP)
+#  endif
+#  if !defined (S_IRWXO)
+#    define S_IRWXO	(S_IROTH | S_IWOTH | S_IXOTH)
+#  endif
+#endif /* !S_IRWXU */
+
+/* These are non-standard, but are used in builtins.c$symbolic_umask() */
+#define S_IRUGO		(S_IRUSR | S_IRGRP | S_IROTH)
+#define S_IWUGO		(S_IWUSR | S_IWGRP | S_IWOTH)
+#define S_IXUGO		(S_IXUSR | S_IXGRP | S_IXOTH)
+
+#endif /* _POSIXSTAT_H_ */
diff --git a/include/posixtime.h b/include/posixtime.h
new file mode 100644
index 0000000..e70ebec
--- /dev/null
+++ b/include/posixtime.h
@@ -0,0 +1,84 @@
+/* posixtime.h -- wrapper for time.h, sys/times.h mess. */
+
+/* Copyright (C) 1999-2021 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/>.
+*/
+
+#ifndef _POSIXTIME_H_
+#define _POSIXTIME_H_
+
+/* include this after config.h */
+/* Some systems require this, mostly for the definition of `struct timezone'.
+   For example, Dynix/ptx has that definition in <time.h> rather than
+      sys/time.h */
+#if defined (HAVE_SYS_TIME_H)
+#  include <sys/time.h>
+#endif
+#include <time.h>
+
+#if !defined (HAVE_SYSCONF) || !defined (_SC_CLK_TCK)
+#  if !defined (CLK_TCK)
+#    if defined (HZ)
+#      define CLK_TCK	HZ
+#    else
+#      define CLK_TCK	60			/* 60HZ */
+#    endif
+#  endif /* !CLK_TCK */
+#endif /* !HAVE_SYSCONF && !_SC_CLK_TCK */
+
+#if !HAVE_TIMEVAL
+struct timeval
+{
+  time_t tv_sec;
+  long int tv_usec;
+};
+#endif
+
+#if !HAVE_GETTIMEOFDAY
+extern int gettimeofday PARAMS((struct timeval *, void *));
+#endif
+
+/* These exist on BSD systems, at least. */
+#if !defined (timerclear)
+#  define timerclear(tvp)	do { (tvp)->tv_sec = 0; (tvp)->tv_usec = 0; } while (0)
+#endif
+#if !defined (timerisset)
+#  define timerisset(tvp)	((tvp)->tv_sec || (tvp)->tv_usec)
+#endif
+#if !defined (timercmp)
+#  define timercmp(a, b, CMP) \
+	(((a)->tv_sec == (b)->tv_sec) ? ((a)->tv_usec CMP (b)->tv_usec) \
+				      : ((a)->tv_sec CMP (b)->tv_sec))
+#endif
+
+/* These are non-standard. */
+#if !defined (timerisunset)
+#  define timerisunset(tvp)	((tvp)->tv_sec == 0 && (tvp)->tv_usec == 0)
+#endif
+#if !defined (timerset)
+#  define timerset(tvp, s, u)	do { tvp->tv_sec = s; tvp->tv_usec = u; } while (0)
+#endif
+
+#ifndef TIMEVAL_TO_TIMESPEC
+#  define TIMEVAL_TO_TIMESPEC(tv, ts) \
+  do { \
+    (ts)->tv_sec = (tv)->tv_sec; \
+    (ts)->tv_nsec = (tv)->tv_usec * 1000; \
+  } while (0)
+#endif
+
+#endif /* _POSIXTIME_H_ */
diff --git a/include/posixwait.h b/include/posixwait.h
new file mode 100644
index 0000000..63b59c2
--- /dev/null
+++ b/include/posixwait.h
@@ -0,0 +1,107 @@
+/* posixwait.h -- job control definitions from POSIX 1003.1 */
+
+/* Copyright (C) 1997 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/>.
+*/
+
+#if !defined (_POSIXWAIT_H_)
+#  define _POSIXWAIT_H_
+
+/* If _POSIX_VERSION is not defined, we assume that <sys/wait.h> defines
+   a `union wait' and various macros used to manipulate it.  Look in
+   unionwait.h for the things we expect to find. */
+#if defined (HAVE_SYS_WAIT_H)
+#  include <sys/wait.h>
+#else /* !HAVE_SYS_WAIT_H */
+#  if !defined (_POSIX_VERSION)
+#    include "unionwait.h"
+#  endif
+#endif  /* !HAVE_SYS_WAIT_H */
+
+/* How to get the status of a job.  For Posix, this is just an
+   int, but for other systems we have to crack the union wait. */
+#if !defined (_POSIX_VERSION)
+typedef union wait WAIT;
+#  define WSTATUS(t)  (t.w_status)
+#else /* _POSIX_VERSION */
+typedef int WAIT;
+#  define WSTATUS(t)  (t)
+#endif /* _POSIX_VERSION */
+
+/* Make sure that parameters to wait3 are defined. */
+#if !defined (WNOHANG)
+#  define WNOHANG 1
+#  define WUNTRACED 2
+#endif /* WNOHANG */
+
+/* More Posix P1003.1 definitions.  In the POSIX versions, the parameter is
+   passed as an `int', in the non-POSIX version, as `union wait'. */
+#if defined (_POSIX_VERSION)
+
+#  if !defined (WSTOPSIG)
+#    define WSTOPSIG(s)       ((s) >> 8)
+#  endif /* !WSTOPSIG */
+
+#  if !defined (WTERMSIG)
+#    define WTERMSIG(s)	      ((s) & 0177)
+#  endif /* !WTERMSIG */
+
+#  if !defined (WEXITSTATUS)
+#    define WEXITSTATUS(s)    ((s) >> 8)
+#  endif /* !WEXITSTATUS */
+
+#  if !defined (WIFSTOPPED)
+#    define WIFSTOPPED(s)     (((s) & 0177) == 0177)
+#  endif /* !WIFSTOPPED */
+
+#  if !defined (WIFEXITED)
+#    define WIFEXITED(s)      (((s) & 0377) == 0)
+#  endif /* !WIFEXITED */
+
+#  if !defined (WIFSIGNALED)
+#    define WIFSIGNALED(s)    (!WIFSTOPPED(s) && !WIFEXITED(s))
+#  endif /* !WIFSIGNALED */
+
+#  if !defined (WIFCORED)
+#    if defined (WCOREDUMP)
+#      define WIFCORED(s)	(WCOREDUMP(s))
+#    else
+#      define WIFCORED(s)       ((s) & 0200)
+#    endif
+#  endif /* !WIFCORED */
+
+#else /* !_POSIX_VERSION */
+
+#  if !defined (WSTOPSIG)
+#    define WSTOPSIG(s)	      ((s).w_stopsig)
+#  endif /* !WSTOPSIG */
+
+#  if !defined (WTERMSIG)
+#    define WTERMSIG(s)	      ((s).w_termsig)
+#  endif /* !WTERMSIG */
+
+#  if !defined (WEXITSTATUS)
+#    define WEXITSTATUS(s)    ((s).w_retcode)
+#  endif /* !WEXITSTATUS */
+
+#  if !defined (WIFCORED)
+#    define WIFCORED(s)       ((s).w_coredump)
+#  endif /* !WIFCORED */
+
+#endif /* !_POSIX_VERSION */
+
+#endif /* !_POSIXWAIT_H_ */
diff --git a/include/shmbchar.h b/include/shmbchar.h
new file mode 100644
index 0000000..27b0024
--- /dev/null
+++ b/include/shmbchar.h
@@ -0,0 +1,112 @@
+/* Multibyte character data type.
+   Copyright (C) 2001, 2005-2007, 2009-2010, 2021 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/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>.  */
+
+#ifndef _SHMBCHAR_H
+#define _SHMBCHAR_H 1
+
+#if defined (HANDLE_MULTIBYTE)
+
+#include <string.h>
+
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
+   <wchar.h>.  */
+#include <stdio.h>
+#include <time.h>
+#include <wchar.h>
+#include <wctype.h>
+
+
+/* is_basic(c) tests whether the single-byte character c is in the
+   ISO C "basic character set". */
+
+#if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
+    && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
+    && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
+    && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
+    && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
+    && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
+    && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
+    && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
+    && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
+    && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
+    && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
+    && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
+    && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
+    && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
+    && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
+    && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
+    && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
+    && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
+    && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
+    && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
+    && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
+    && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
+    && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
+/* The character set is ISO-646, not EBCDIC. */
+# define IS_BASIC_ASCII 1
+
+extern const unsigned int is_basic_table[];
+
+static inline int
+is_basic (char c)
+{
+  return (is_basic_table [(unsigned char) c >> 5] >> ((unsigned char) c & 31))
+         & 1;
+}
+
+#else
+
+static inline int
+is_basic (char c)
+{
+  switch (c)
+    {
+    case '\b': case '\r': case '\n':
+    case '\t': case '\v': case '\f':
+    case ' ': case '!': case '"': case '#': case '%':
+    case '&': case '\'': case '(': case ')': case '*':
+    case '+': case ',': case '-': case '.': case '/':
+    case '0': case '1': case '2': case '3': case '4':
+    case '5': case '6': case '7': case '8': case '9':
+    case ':': case ';': case '<': case '=': case '>':
+    case '?':
+    case 'A': case 'B': case 'C': case 'D': case 'E':
+    case 'F': case 'G': case 'H': case 'I': case 'J':
+    case 'K': case 'L': case 'M': case 'N': case 'O':
+    case 'P': case 'Q': case 'R': case 'S': case 'T':
+    case 'U': case 'V': case 'W': case 'X': case 'Y':
+    case 'Z':
+    case '[': case '\\': case ']': case '^': case '_':
+    case 'a': case 'b': case 'c': case 'd': case 'e':
+    case 'f': case 'g': case 'h': case 'i': case 'j':
+    case 'k': case 'l': case 'm': case 'n': case 'o':
+    case 'p': case 'q': case 'r': case 's': case 't':
+    case 'u': case 'v': case 'w': case 'x': case 'y':
+    case 'z': case '{': case '|': case '}': case '~':
+      return 1;
+    default:
+      return 0;
+    }
+}
+
+#endif
+
+#endif /* HANDLE_MULTIBYTE */
+#endif /* _SHMBCHAR_H */
diff --git a/include/shmbutil.h b/include/shmbutil.h
new file mode 100644
index 0000000..0f711ea
--- /dev/null
+++ b/include/shmbutil.h
@@ -0,0 +1,559 @@
+/* shmbutil.h -- utility functions for multibyte characters. */
+
+/* Copyright (C) 2002-2019 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/>.
+*/
+                                 
+#if !defined (_SH_MBUTIL_H_)
+#define _SH_MBUTIL_H_
+
+#include "stdc.h"
+
+/* Include config.h for HANDLE_MULTIBYTE */
+#include <config.h>
+
+#if defined (HANDLE_MULTIBYTE)
+#include "shmbchar.h"
+
+extern size_t xwcsrtombs PARAMS((char *, const wchar_t **, size_t, mbstate_t *));
+extern size_t xmbsrtowcs PARAMS((wchar_t *, const char **, size_t, mbstate_t *));
+extern size_t xdupmbstowcs PARAMS((wchar_t **, char ***, const char *));
+
+extern size_t mbstrlen PARAMS((const char *));
+
+extern char *xstrchr PARAMS((const char *, int));
+
+extern int locale_mb_cur_max;	/* XXX */
+extern int locale_utf8locale;	/* XXX */
+
+#ifndef MB_INVALIDCH
+#define MB_INVALIDCH(x)		((x) == (size_t)-1 || (x) == (size_t)-2)
+#define MB_NULLWCH(x)		((x) == 0)
+#endif
+
+#define MBSLEN(s)	(((s) && (s)[0]) ? ((s)[1] ? mbstrlen (s) : 1) : 0)
+#define MB_STRLEN(s)	((MB_CUR_MAX > 1) ? MBSLEN (s) : STRLEN (s))
+
+#define MBLEN(s, n)	((MB_CUR_MAX > 1) ? mblen ((s), (n)) : 1)
+#define MBRLEN(s, n, p)	((MB_CUR_MAX > 1) ? mbrlen ((s), (n), (p)) : 1)
+
+#define UTF8_SINGLEBYTE(c)	(((c) & 0x80) == 0)
+#define UTF8_MBFIRSTCHAR(c)	(((c) & 0xc0) == 0xc0)
+#define UTF8_MBCHAR(c)		(((c) & 0xc0) == 0x80)
+
+#else /* !HANDLE_MULTIBYTE */
+
+#undef MB_LEN_MAX
+#undef MB_CUR_MAX
+
+#define MB_LEN_MAX	1
+#define MB_CUR_MAX	1
+
+#undef xstrchr
+#define xstrchr(s, c)	strchr(s, c)
+
+#ifndef MB_INVALIDCH
+#define MB_INVALIDCH(x)		(0)
+#define MB_NULLWCH(x)		(0)
+#endif
+
+#define MB_STRLEN(s)		(STRLEN(s))
+
+#define MBLEN(s, n)		1
+#define MBRLEN(s, n, p)		1
+
+#ifndef wchar_t
+#  define wchar_t	int
+#endif
+
+#define UTF8_SINGLEBYTE(c)	(1)
+#define UTF8_MBFIRSTCHAR(c)	(0)
+
+#endif /* !HANDLE_MULTIBYTE */
+
+/* Declare and initialize a multibyte state.  Call must be terminated
+   with `;'. */
+#if defined (HANDLE_MULTIBYTE)
+#  define DECLARE_MBSTATE \
+	mbstate_t state; \
+	memset (&state, '\0', sizeof (mbstate_t))
+#else
+#  define DECLARE_MBSTATE
+#endif  /* !HANDLE_MULTIBYTE */
+
+/* Initialize or reinitialize a multibyte state named `state'.  Call must be
+   terminated with `;'. */
+#if defined (HANDLE_MULTIBYTE)
+#  define INITIALIZE_MBSTATE memset (&state, '\0', sizeof (mbstate_t))
+#else
+#  define INITIALIZE_MBSTATE
+#endif  /* !HANDLE_MULTIBYTE */
+
+/* Advance one (possibly multi-byte) character in string _STR of length
+   _STRSIZE, starting at index _I.  STATE must have already been declared. */
+#if defined (HANDLE_MULTIBYTE)
+#  define ADVANCE_CHAR(_str, _strsize, _i) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    int _f; \
+\
+	    _f = is_basic ((_str)[_i]); \
+	    if (_f) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && (((_str)[_i] & 0x80) == 0)) \
+	      mblength = (_str)[_i] != 0; \
+	    else \
+	      { \
+	        state_bak = state; \
+	        mblength = mbrlen ((_str) + (_i), (_strsize) - (_i), &state); \
+	      } \
+\
+	    if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+	      { \
+		state = state_bak; \
+		(_i)++; \
+	      } \
+	    else if (mblength == 0) \
+	      (_i)++; \
+	    else \
+	      (_i) += mblength; \
+	  } \
+	else \
+	  (_i)++; \
+      } \
+    while (0)
+#else
+#  define ADVANCE_CHAR(_str, _strsize, _i)	(_i)++
+#endif  /* !HANDLE_MULTIBYTE */
+
+/* Advance one (possibly multibyte) character in the string _STR of length
+   _STRSIZE.
+   SPECIAL:  assume that _STR will be incremented by 1 after this call. */
+#if defined (HANDLE_MULTIBYTE)
+#  define ADVANCE_CHAR_P(_str, _strsize) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    int _f; \
+\
+	    _f = is_basic (*(_str)); \
+	    if (_f) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && ((*(_str) & 0x80) == 0)) \
+	      mblength = *(_str) != 0; \
+	    else \
+	      { \
+		state_bak = state; \
+		mblength = mbrlen ((_str), (_strsize), &state); \
+	      } \
+\
+	    if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    else \
+	      (_str) += (mblength < 1) ? 0 : (mblength - 1); \
+	  } \
+      } \
+    while (0)
+#else
+#  define ADVANCE_CHAR_P(_str, _strsize)
+#endif  /* !HANDLE_MULTIBYTE */
+
+/* Back up one (possibly multi-byte) character in string _STR of length
+   _STRSIZE, starting at index _I.  STATE must have already been declared. */
+#if defined (HANDLE_MULTIBYTE)
+#  define BACKUP_CHAR(_str, _strsize, _i) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    int _x, _p; /* _x == temp index into string, _p == prev index */ \
+\
+	    _x = _p = 0; \
+	    while (_x < (_i)) \
+	      { \
+	        state_bak = state; \
+	        mblength = mbrlen ((_str) + (_x), (_strsize) - (_x), &state); \
+\
+		if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+		  { \
+		    state = state_bak; \
+		    _x++; \
+		  } \
+		else if (mblength == 0) \
+		  _x++; \
+		else \
+		  { \
+		    _p = _x; /* _p == start of prev mbchar */ \
+		    _x += mblength; \
+		  } \
+	      } \
+	    (_i) = _p; \
+	  } \
+	else \
+	  (_i)--; \
+      } \
+    while (0)
+#else
+#  define BACKUP_CHAR(_str, _strsize, _i)	(_i)--
+#endif  /* !HANDLE_MULTIBYTE */
+
+/* Back up one (possibly multibyte) character in the string _BASE of length
+   _STRSIZE starting at _STR (_BASE <= _STR <= (_BASE + _STRSIZE) ).
+   SPECIAL: DO NOT assume that _STR will be decremented by 1 after this call. */
+#if defined (HANDLE_MULTIBYTE)
+#  define BACKUP_CHAR_P(_base, _strsize, _str) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    char *_x, _p; /* _x == temp pointer into string, _p == prev pointer */ \
+\
+	    _x = _p = _base; \
+	    while (_x < (_str)) \
+	      { \
+	        state_bak = state; \
+	        mblength = mbrlen (_x, (_strsize) - _x, &state); \
+\
+		if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+		  { \
+		    state = state_bak; \
+		    _x++; \
+		  } \
+		else if (mblength == 0) \
+		  _x++; \
+		else \
+		  { \
+		    _p = _x; /* _p == start of prev mbchar */ \
+		    _x += mblength; \
+		  } \
+	      } \
+	    (_str) = _p; \
+	  } \
+	else \
+	  (_str)--; \
+      } \
+    while (0)
+#else
+#  define BACKUP_CHAR_P(_base, _strsize, _str) (_str)--
+#endif  /* !HANDLE_MULTIBYTE */
+
+/* Copy a single character from the string _SRC to the string _DST.
+   _SRCEND is a pointer to the end of _SRC. */
+#if defined (HANDLE_MULTIBYTE)
+#  define COPY_CHAR_P(_dst, _src, _srcend) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    int _k; \
+\
+	    _k = is_basic (*(_src)); \
+	    if (_k) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && ((*(_src) & 0x80) == 0)) \
+	      mblength = *(_src) != 0; \
+	    else \
+	      { \
+		state_bak = state; \
+		mblength = mbrlen ((_src), (_srcend) - (_src), &state); \
+	      } \
+	    if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    else \
+	      mblength = (mblength < 1) ? 1 : mblength; \
+\
+	    for (_k = 0; _k < mblength; _k++) \
+	      *(_dst)++ = *(_src)++; \
+	  } \
+	else \
+	  *(_dst)++ = *(_src)++; \
+      } \
+    while (0)
+#else
+#  define COPY_CHAR_P(_dst, _src, _srcend)	*(_dst)++ = *(_src)++
+#endif  /* !HANDLE_MULTIBYTE */
+
+/* Copy a single character from the string _SRC at index _SI to the string
+   _DST at index _DI.  _SRCEND is a pointer to the end of _SRC. */
+#if defined (HANDLE_MULTIBYTE)
+#  define COPY_CHAR_I(_dst, _di, _src, _srcend, _si) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    int _k; \
+\
+	    _k = is_basic ((_src)[(_si)]); \
+	    if (_k) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && ((_src)[(_si)] & 0x80) == 0) \
+	      mblength = (_src)[(_si)] != 0; \
+	    else \
+	      {\
+		state_bak = state; \
+		mblength = mbrlen ((_src) + (_si), (_srcend) - ((_src)+(_si)), &state); \
+	      } \
+	    if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    else \
+	      mblength = (mblength < 1) ? 1 : mblength; \
+\
+	    for (_k = 0; _k < mblength; _k++) \
+	      _dst[_di++] = _src[_si++]; \
+	  } \
+	else \
+	  _dst[_di++] = _src[_si++]; \
+      } \
+    while (0)
+#else
+#  define COPY_CHAR_I(_dst, _di, _src, _srcend, _si)	_dst[_di++] = _src[_si++]
+#endif  /* !HANDLE_MULTIBYTE */
+
+/****************************************************************
+ *								*
+ * The following are only guaranteed to work in subst.c		*
+ *								*
+ ****************************************************************/
+
+#if defined (HANDLE_MULTIBYTE)
+#  define SCOPY_CHAR_I(_dst, _escchar, _sc, _src, _si, _slen) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    int _i; \
+\
+	    _i = is_basic ((_src)[(_si)]); \
+	    if (_i) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && ((_src)[(_si)] & 0x80) == 0) \
+	      mblength = (_src)[(_si)] != 0; \
+	    else \
+	      { \
+		state_bak = state; \
+		mblength = mbrlen ((_src) + (_si), (_slen) - (_si), &state); \
+	      } \
+	    if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    else \
+	      mblength = (mblength < 1) ? 1 : mblength; \
+\
+	    temp = xmalloc (mblength + 2); \
+	    temp[0] = _escchar; \
+	    for (_i = 0; _i < mblength; _i++) \
+	      temp[_i + 1] = _src[_si++]; \
+	    temp[mblength + 1] = '\0'; \
+\
+	    goto add_string; \
+	  } \
+	else \
+	  { \
+	    _dst[0] = _escchar; \
+	    _dst[1] = _sc; \
+	  } \
+      } \
+    while (0)
+#else
+#  define SCOPY_CHAR_I(_dst, _escchar, _sc, _src, _si, _slen) \
+    _dst[0] = _escchar; \
+    _dst[1] = _sc
+#endif  /* !HANDLE_MULTIBYTE */
+
+#if defined (HANDLE_MULTIBYTE)
+#  define SCOPY_CHAR_M(_dst, _src, _srcend, _si) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+	    int _i; \
+\
+	    _i = is_basic (*((_src) + (_si))); \
+	    if (_i) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && (((_src)[_si] & 0x80) == 0)) \
+              mblength = (_src)[_si] != 0; \
+	    else \
+	      { \
+		state_bak = state; \
+		mblength = mbrlen ((_src) + (_si), (_srcend) - ((_src) + (_si)), &state); \
+	      } \
+	    if (mblength == (size_t)-2 || mblength == (size_t)-1) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    else \
+	      mblength = (mblength < 1) ? 1 : mblength; \
+\
+	    FASTCOPY(((_src) + (_si)), (_dst), mblength); \
+\
+	    (_dst) += mblength; \
+	    (_si) += mblength; \
+	  } \
+	else \
+	  { \
+	    *(_dst)++ = _src[(_si)]; \
+	    (_si)++; \
+	  } \
+      } \
+    while (0)
+#else
+#  define SCOPY_CHAR_M(_dst, _src, _srcend, _si) \
+	*(_dst)++ = _src[(_si)]; \
+	(_si)++
+#endif  /* !HANDLE_MULTIBYTE */
+
+#if HANDLE_MULTIBYTE
+#  define SADD_MBCHAR(_dst, _src, _si, _srcsize) \
+    do \
+      { \
+	if (locale_mb_cur_max > 1) \
+	  { \
+	    int i; \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+\
+	    i = is_basic (*((_src) + (_si))); \
+	    if (i) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && (((_src)[_si] & 0x80) == 0)) \
+	      mblength = (_src)[_si] != 0; \
+	    else \
+	      { \
+		state_bak = state; \
+		mblength = mbrlen ((_src) + (_si), (_srcsize) - (_si), &state); \
+	      } \
+	    if (mblength == (size_t)-1 || mblength == (size_t)-2) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    if (mblength < 1) \
+	      mblength = 1; \
+\
+	    _dst = (char *)xmalloc (mblength + 1); \
+	    for (i = 0; i < mblength; i++) \
+	      (_dst)[i] = (_src)[(_si)++]; \
+	    (_dst)[mblength] = '\0'; \
+\
+	    goto add_string; \
+	  } \
+      } \
+    while (0)
+
+#else
+#  define SADD_MBCHAR(_dst, _src, _si, _srcsize)
+#endif
+
+/* Watch out when using this -- it's just straight textual substitution */
+#if defined (HANDLE_MULTIBYTE)
+#  define SADD_MBQCHAR_BODY(_dst, _src, _si, _srcsize) \
+\
+	    int i; \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+\
+	    i = is_basic (*((_src) + (_si))); \
+	    if (i) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && (((_src)[_si] & 0x80) == 0)) \
+	      mblength = (_src)[_si] != 0; \
+	    else \
+	      { \
+		state_bak = state; \
+		mblength = mbrlen ((_src) + (_si), (_srcsize) - (_si), &state); \
+	      } \
+	    if (mblength == (size_t)-1 || mblength == (size_t)-2) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    if (mblength < 1) \
+	      mblength = 1; \
+\
+	    (_dst) = (char *)xmalloc (mblength + 2); \
+	    (_dst)[0] = CTLESC; \
+	    for (i = 0; i < mblength; i++) \
+	      (_dst)[i+1] = (_src)[(_si)++]; \
+	    (_dst)[mblength+1] = '\0'; \
+\
+	    goto add_string
+
+#  define SADD_MBCHAR_BODY(_dst, _src, _si, _srcsize) \
+\
+	    int i; \
+	    mbstate_t state_bak; \
+	    size_t mblength; \
+\
+	    i = is_basic (*((_src) + (_si))); \
+	    if (i) \
+	      mblength = 1; \
+	    else if (locale_utf8locale && (((_src)[_si] & 0x80) == 0)) \
+              mblength = (_src)[_si] != 0; \
+            else \
+	      { \
+		state_bak = state; \
+		mblength = mbrlen ((_src) + (_si), (_srcsize) - (_si), &state); \
+	      } \
+	    if (mblength == (size_t)-1 || mblength == (size_t)-2) \
+	      { \
+		state = state_bak; \
+		mblength = 1; \
+	      } \
+	    if (mblength < 1) \
+	      mblength = 1; \
+\
+	    (_dst) = (char *)xmalloc (mblength + 1); \
+	    for (i = 0; i < mblength; i++) \
+	      (_dst)[i+1] = (_src)[(_si)++]; \
+	    (_dst)[mblength+1] = '\0'; \
+\
+	    goto add_string
+
+#endif /* HANDLE_MULTIBYTE */
+#endif /* _SH_MBUTIL_H_ */
diff --git a/include/shtty.h b/include/shtty.h
new file mode 100644
index 0000000..fdf379b
--- /dev/null
+++ b/include/shtty.h
@@ -0,0 +1,112 @@
+/* Copyright (C) 1999-2020 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/>.
+*/
+
+/*
+ * shtty.h -- include the correct system-dependent files to manipulate the
+ *	      tty
+ */
+
+#ifndef __SH_TTY_H_
+#define __SH_TTY_H_
+
+#include "stdc.h"
+
+#if defined (_POSIX_VERSION) && defined (HAVE_TERMIOS_H) && defined (HAVE_TCGETATTR) && !defined (TERMIOS_MISSING)
+#  define TERMIOS_TTY_DRIVER
+#else
+#  if defined (HAVE_TERMIO_H)
+#    define TERMIO_TTY_DRIVER
+#  else
+#    define NEW_TTY_DRIVER
+#  endif
+#endif
+
+/*
+ * The _POSIX_SOURCE define is to avoid multiple symbol definitions
+ * between sys/ioctl.h and termios.h.  Ditto for the test against SunOS4
+ * and the undefining of several symbols.
+ */
+      
+#ifdef TERMIOS_TTY_DRIVER
+#  if (defined (SunOS4) || defined (SunOS5)) && !defined (_POSIX_SOURCE)
+#    define _POSIX_SOURCE
+#  endif
+#  if defined (SunOS4)
+#    undef ECHO
+#    undef NOFLSH
+#    undef TOSTOP
+#  endif /* SunOS4 */
+#  include <termios.h>
+#  define TTYSTRUCT struct termios
+#else
+#  ifdef TERMIO_TTY_DRIVER
+#    include <termio.h>
+#    define TTYSTRUCT struct termio
+#  else	/* NEW_TTY_DRIVER */
+#    include <sgtty.h>
+#    define TTYSTRUCT struct sgttyb
+#  endif
+#endif
+
+/* Functions imported from lib/sh/shtty.c */
+
+/* Get and set terminal attributes for the file descriptor passed as
+   an argument. */
+extern int ttgetattr PARAMS((int, TTYSTRUCT *));
+extern int ttsetattr PARAMS((int, TTYSTRUCT *));
+
+/* Save and restore the terminal's attributes from static storage. */
+extern void ttsave PARAMS((void));
+extern void ttrestore PARAMS((void));
+
+/* Return the attributes corresponding to the file descriptor (0 or 1)
+   passed as an argument. */
+extern TTYSTRUCT *ttattr PARAMS((int));
+
+/* These functions only operate on the passed TTYSTRUCT; they don't
+   actually change anything with the kernel's current tty settings. */
+extern int tt_setonechar PARAMS((TTYSTRUCT *));
+extern int tt_setnoecho PARAMS((TTYSTRUCT *));
+extern int tt_seteightbit PARAMS((TTYSTRUCT *));
+extern int tt_setnocanon PARAMS((TTYSTRUCT *));
+extern int tt_setcbreak PARAMS((TTYSTRUCT *));
+
+/* These functions are all generally mutually exclusive.  If you call
+   more than one (bracketed with calls to ttsave and ttrestore, of
+   course), the right thing will happen, but more system calls will be
+   executed than absolutely necessary.  You can do all of this yourself
+   with the other functions; these are only conveniences. */
+
+/* These functions work with a given file descriptor and set terminal
+   attributes */
+extern int ttfd_onechar PARAMS((int, TTYSTRUCT *));
+extern int ttfd_noecho PARAMS((int, TTYSTRUCT *));
+extern int ttfd_eightbit PARAMS((int, TTYSTRUCT *));
+extern int ttfd_nocanon PARAMS((int, TTYSTRUCT *));
+
+extern int ttfd_cbreak PARAMS((int, TTYSTRUCT *));
+
+/* These functions work with fd 0 and the TTYSTRUCT saved with ttsave () */
+extern int ttonechar PARAMS((void));
+extern int ttnoecho PARAMS((void));
+extern int tteightbit PARAMS((void));
+extern int ttnocanon PARAMS((void));
+
+extern int ttcbreak PARAMS((void));
+
+#endif
diff --git a/include/stat-time.h b/include/stat-time.h
new file mode 100644
index 0000000..e04cc61
--- /dev/null
+++ b/include/stat-time.h
@@ -0,0 +1,214 @@
+/* stat-related time functions.
+
+   Copyright (C) 2005, 2007, 2009-2012 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/>.  */
+
+/* Written by Paul Eggert.  */
+
+#ifndef STAT_TIME_H
+#define STAT_TIME_H 1
+
+#include <sys/stat.h>
+
+#if defined (TIME_H_DEFINES_STRUCT_TIMESPEC)
+#  include <time.h>
+#elif defined (SYS_TIME_H_DEFINES_STRUCT_TIMESPEC)
+#  include <sys/time.h>
+#elif defined (PTHREAD_H_DEFINES_STRUCT_TIMESPEC)
+#  include <pthread.h>
+#endif
+
+#ifndef HAVE_STRUCT_TIMESPEC
+struct timespec
+{
+  time_t tv_sec;
+  long int tv_nsec;
+};
+#endif
+
+/* STAT_TIMESPEC (ST, ST_XTIM) is the ST_XTIM member for *ST of type
+   struct timespec, if available.  If not, then STAT_TIMESPEC_NS (ST,
+   ST_XTIM) is the nanosecond component of the ST_XTIM member for *ST,
+   if available.  ST_XTIM can be st_atim, st_ctim, st_mtim, or st_birthtim
+   for access, status change, data modification, or birth (creation)
+   time respectively.
+
+   These macros are private to stat-time.h.  */
+#if defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC
+# ifdef TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC
+#  define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim)
+# else
+#  define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec)
+# endif
+#elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC
+# define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec)
+#elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC
+# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec)
+#elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC
+# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec)
+#endif
+
+/* Return the nanosecond component of *ST's access time.  */
+static inline long int
+get_stat_atime_ns (struct stat const *st)
+{
+# if defined STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_atim).tv_nsec;
+# elif defined STAT_TIMESPEC_NS
+  return STAT_TIMESPEC_NS (st, st_atim);
+# else
+  return 0;
+# endif
+}
+
+/* Return the nanosecond component of *ST's status change time.  */
+static inline long int
+get_stat_ctime_ns (struct stat const *st)
+{
+# if defined STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_ctim).tv_nsec;
+# elif defined STAT_TIMESPEC_NS
+  return STAT_TIMESPEC_NS (st, st_ctim);
+# else
+  return 0;
+# endif
+}
+
+/* Return the nanosecond component of *ST's data modification time.  */
+static inline long int
+get_stat_mtime_ns (struct stat const *st)
+{
+# if defined STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_mtim).tv_nsec;
+# elif defined STAT_TIMESPEC_NS
+  return STAT_TIMESPEC_NS (st, st_mtim);
+# else
+  return 0;
+# endif
+}
+
+/* Return the nanosecond component of *ST's birth time.  */
+static inline long int
+get_stat_birthtime_ns (struct stat const *st)
+{
+# if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
+  return STAT_TIMESPEC (st, st_birthtim).tv_nsec;
+# elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
+  return STAT_TIMESPEC_NS (st, st_birthtim);
+# else
+  /* Avoid a "parameter unused" warning.  */
+  (void) st;
+  return 0;
+# endif
+}
+
+/* Return *ST's access time.  */
+static inline struct timespec
+get_stat_atime (struct stat const *st)
+{
+#ifdef STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_atim);
+#else
+  struct timespec t;
+  t.tv_sec = st->st_atime;
+  t.tv_nsec = get_stat_atime_ns (st);
+  return t;
+#endif
+}
+
+/* Return *ST's status change time.  */
+static inline struct timespec
+get_stat_ctime (struct stat const *st)
+{
+#ifdef STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_ctim);
+#else
+  struct timespec t;
+  t.tv_sec = st->st_ctime;
+  t.tv_nsec = get_stat_ctime_ns (st);
+  return t;
+#endif
+}
+
+/* Return *ST's data modification time.  */
+static inline struct timespec
+get_stat_mtime (struct stat const *st)
+{
+#ifdef STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_mtim);
+#else
+  struct timespec t;
+  t.tv_sec = st->st_mtime;
+  t.tv_nsec = get_stat_mtime_ns (st);
+  return t;
+#endif
+}
+
+static inline int
+timespec_cmp (struct timespec a, struct timespec b)
+{
+  return (a.tv_sec < b.tv_sec
+  	    ? -1
+	    : (a.tv_sec > b.tv_sec
+		 ? 1
+		 : (int) (a.tv_nsec - b.tv_nsec)));
+}
+
+/* Return *ST's birth time, if available; otherwise return a value
+   with tv_sec and tv_nsec both equal to -1.  */
+static inline struct timespec
+get_stat_birthtime (struct stat const *st)
+{
+  struct timespec t;
+
+#if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
+     || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC)
+  t = STAT_TIMESPEC (st, st_birthtim);
+#elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
+  t.tv_sec = st->st_birthtime;
+  t.tv_nsec = st->st_birthtimensec;
+#elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+  /* Native Windows platforms (but not Cygwin) put the "file creation
+     time" in st_ctime (!).  See
+     <http://msdn2.microsoft.com/de-de/library/14h5k7ff(VS.80).aspx>.  */
+  t.tv_sec = st->st_ctime;
+  t.tv_nsec = 0;
+#else
+  /* Birth time is not supported.  */
+  t.tv_sec = -1;
+  t.tv_nsec = -1;
+  /* Avoid a "parameter unused" warning.  */
+  (void) st;
+#endif
+
+#if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
+     || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \
+     || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
+  /* FreeBSD and NetBSD sometimes signal the absence of knowledge by
+     using zero.  Attempt to work around this problem.  Alas, this can
+     report failure even for valid time stamps.  Also, NetBSD
+     sometimes returns junk in the birth time fields; work around this
+     bug if it is detected.  */
+  if (! (t.tv_sec && 0 <= t.tv_nsec && t.tv_nsec < 1000000000))
+    {
+      t.tv_sec = -1;
+      t.tv_nsec = -1;
+    }
+#endif
+
+  return t;
+}
+
+#endif
diff --git a/include/stdc.h b/include/stdc.h
new file mode 100644
index 0000000..38516ae
--- /dev/null
+++ b/include/stdc.h
@@ -0,0 +1,89 @@
+/* stdc.h -- macros to make source compile on both ANSI C and K&R C
+   compilers. */
+
+/* Copyright (C) 1993-2021 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/>.
+*/
+
+#if !defined (_STDC_H_)
+#define _STDC_H_
+
+/* Adapted from BSD /usr/include/sys/cdefs.h. */
+
+/* A function can be defined using prototypes and compile on both ANSI C
+   and traditional C compilers with something like this:
+	extern char *func PARAMS((char *, char *, int)); */
+
+#if !defined (PARAMS)
+#  if defined (__STDC__) || defined (__GNUC__) || defined (__cplusplus) || defined (PROTOTYPES)
+#    define PARAMS(protos) protos
+#  else 
+#    define PARAMS(protos) ()
+#  endif
+#endif
+
+/* Fortify, at least, has trouble with this definition */
+#if defined (HAVE_STRINGIZE)
+#  define CPP_STRING(x) #x
+#else
+#  define CPP_STRING(x) "x"
+#endif
+
+#if !defined (__STDC__)
+
+#if defined (__GNUC__)		/* gcc with -traditional */
+#  if !defined (signed)
+#    define signed __signed
+#  endif
+#  if !defined (volatile)
+#    define volatile __volatile
+#  endif
+#else /* !__GNUC__ */
+#  if !defined (inline)
+#    define inline
+#  endif
+#  if !defined (signed)
+#    define signed
+#  endif
+#  if !defined (volatile)
+#    define volatile
+#  endif
+#endif /* !__GNUC__ */
+
+#endif /* !__STDC__ */
+
+#ifndef __attribute__
+#  if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
+#    define __attribute__(x)
+#  endif
+#endif
+
+/* For those situations when gcc handles inlining a particular function but
+   other compilers complain. */
+#ifdef __GNUC__
+#  define INLINE inline
+#else
+#  define INLINE
+#endif
+
+#if defined (PREFER_STDARG)
+#  define SH_VA_START(va, arg)  va_start(va, arg)
+#else
+#  define SH_VA_START(va, arg)  va_start(va)
+#endif
+
+#endif /* !_STDC_H_ */
diff --git a/include/systimes.h b/include/systimes.h
new file mode 100644
index 0000000..aefcab7
--- /dev/null
+++ b/include/systimes.h
@@ -0,0 +1,55 @@
+/* Copyright (C) 1991-2020 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/>.
+*/
+
+/*
+ *	POSIX Standard: 4.5.2 Process Times	<sys/times.h>
+ */
+
+/*
+ * If we don't have a standard system clock_t type, this must be included
+ * after config.h
+ */
+
+#ifndef	_BASH_SYSTIMES_H
+#define _BASH_SYSTIMES_H	1
+
+#if defined (HAVE_SYS_TIMES_H)
+#  include <sys/times.h>
+#else /* !HAVE_SYS_TIMES_H */
+
+#include <stdc.h>
+
+/* Structure describing CPU time used by a process and its children.  */
+struct tms
+  {
+    clock_t tms_utime;		/* User CPU time.  */
+    clock_t tms_stime;		/* System CPU time.  */
+
+    clock_t tms_cutime;		/* User CPU time of dead children.  */
+    clock_t tms_cstime;		/* System CPU time of dead children.  */
+  };
+
+/* Store the CPU time used by this process and all its
+   dead descendants in BUFFER.
+   Return the elapsed real time from an arbitrary point in the
+   past (the bash emulation uses the epoch), or (clock_t) -1 for
+   errors.  All times are in CLK_TCKths of a second.  */
+extern clock_t times PARAMS((struct tms *buffer));
+
+#endif /* !HAVE_SYS_TIMES_H */
+#endif /* _BASH_SYSTIMES_H */
diff --git a/include/timer.h b/include/timer.h
new file mode 100644
index 0000000..2779475
--- /dev/null
+++ b/include/timer.h
@@ -0,0 +1,64 @@
+/* timer.h -- data structures used by the shell timers in lib/sh/timers.c */
+
+/* Copyright (C) 2021 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/>.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "bashjmp.h"
+typedef struct _shtimer
+{
+  struct timeval tmout;
+
+  int fd;
+  int flags;
+
+  int alrmflag;					/* should be set by alrm_handler */
+
+  SigHandler *alrm_handler;
+  SigHandler *old_handler;
+
+  procenv_t jmpenv;
+
+  int (*tm_handler) (struct _shtimer *);	/* called on timeout if set */
+  PTR_T	*data;					/* reserved */
+} sh_timer;
+
+#define SHTIMER_ALARM	0x01			/* mutually exclusive */
+#define SHTIMER_SELECT	0x02
+#define SHTIMER_LONGJMP	0x04
+
+#define SHTIMER_SIGSET	0x100
+#define SHTIMER_ALRMSET	0x200
+
+extern sh_timer *shtimer_alloc (void);
+extern void shtimer_flush (sh_timer *);
+extern void shtimer_dispose (sh_timer *);
+
+extern void shtimer_set (sh_timer *, time_t, long);
+extern void shtimer_unset (sh_timer *);
+
+extern void shtimer_cleanup (sh_timer *);
+extern void shtimer_clear (sh_timer *);
+
+extern int shtimer_chktimeout (sh_timer *);
+
+extern int shtimer_select (sh_timer *);
+extern int shtimer_alrm (sh_timer *);
diff --git a/include/typemax.h b/include/typemax.h
new file mode 100644
index 0000000..e3b98f4
--- /dev/null
+++ b/include/typemax.h
@@ -0,0 +1,141 @@
+/* typemax.h -- encapsulate max values for long, long long, etc. */
+
+/* Copyright (C) 2001-2021 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/>.
+*/
+
+/*
+ * NOTE:  This should be included after config.h, limits.h, stdint.h, and
+ *	  inttypes.h
+ */
+
+#ifndef _SH_TYPEMAX_H
+#define _SH_TYPEMAX_H
+
+#ifndef CHAR_BIT
+#  define CHAR_BIT 8
+#endif
+
+/* Nonzero if the integer type T is signed.  */
+#ifndef TYPE_SIGNED
+#  define TYPE_SIGNED(t)	(! ((t) 0 < (t) -1))
+#endif
+
+#ifndef TYPE_SIGNED_MAGNITUDE
+#  define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
+#endif
+
+#ifndef TYPE_WIDTH
+#  define TYPE_WIDTH(t) (sizeof (t) * CHAR_BIT)
+#endif
+
+#ifndef TYPE_MINIMUM
+#  define TYPE_MINIMUM(t) ((t) ~ TYPE_MAXIMUM (t))
+#endif
+
+#ifndef TYPE_MAXIMUM
+#  define TYPE_MAXIMUM(t)  \
+  ((t) (! TYPE_SIGNED (t) \
+        ? (t) -1 \
+        : ((((t) 1 << (TYPE_WIDTH (t) - 2)) - 1) * 2 + 1)))
+#endif
+
+#ifdef HAVE_LONG_LONG_INT
+#  ifndef LLONG_MAX
+#    define LLONG_MAX   TYPE_MAXIMUM(long long int)
+#    define LLONG_MIN	TYPE_MINIMUM(long long int)
+#  endif
+#  ifndef ULLONG_MAX
+#    define ULLONG_MAX  TYPE_MAXIMUM(unsigned long long int)
+#  endif
+#endif
+
+#ifndef ULONG_MAX
+#  define ULONG_MAX	((unsigned long) ~(unsigned long) 0)
+#endif
+
+#ifndef LONG_MAX
+#  define LONG_MAX	((long int) (ULONG_MAX >> 1))
+#  define LONG_MIN	((long int) (-LONG_MAX - 1L))
+#endif
+
+#ifndef INT_MAX		/* ouch */
+#  define INT_MAX	TYPE_MAXIMUM(int)
+#  define INT_MIN	TYPE_MINIMUM(int)
+#  define UINT_MAX	((unsigned int) ~(unsigned int)0)
+#endif
+
+#ifndef SHRT_MAX
+#  define SHRT_MAX	TYPE_MAXIMUM(short)
+#  define SHRT_MIN	TYPE_MINIMUM(short)
+#  define USHRT_MAX	((unsigned short) ~(unsigned short)0)
+#endif
+
+#ifndef UCHAR_MAX
+#  define UCHAR_MAX	255
+#endif
+
+/* workaround for gcc bug in versions < 2.7 */
+#if defined (HAVE_LONG_LONG_INT) && __GNUC__ == 2 && __GNUC_MINOR__ < 7
+static const unsigned long long int maxquad = ULLONG_MAX;
+#  undef ULLONG_MAX
+#  define ULLONG_MAX maxquad
+#endif
+
+#if !defined (INTMAX_MAX) || !defined (INTMAX_MIN)
+
+#if SIZEOF_INTMAX_T == SIZEOF_LONG_LONG
+#  define INTMAX_MAX	LLONG_MAX
+#  define INTMAX_MIN	LLONG_MIN
+#elif SIZEOF_INTMAX_T == SIZEOF_LONG
+#  define INTMAX_MAX	LONG_MAX
+#  define INTMAX_MIN	LONG_MIN
+#else
+#  define INTMAX_MAX	INT_MAX
+#  define INTMAX_MIN	INT_MIN
+#endif
+
+#endif
+
+#ifndef SSIZE_MAX
+#  define SSIZE_MAX	INT_MAX
+#endif
+
+#ifndef SIZE_MAX
+#  define SIZE_MAX	((size_t) ~(size_t)0)
+#endif
+
+#ifndef sh_imaxabs
+#  define sh_imaxabs(x)	(((x) >= 0) ? (x) : -(x))
+#endif
+
+/* Handle signed arithmetic overflow and underflow.  Have to do it this way
+   to avoid compilers optimizing out simpler overflow checks. */
+
+/* Make sure that a+b does not exceed MAXV or is smaller than MINV (if b < 0).
+   Assumes that b > 0 if a > 0 and b < 0 if a < 0 */
+#define ADDOVERFLOW(a,b,minv,maxv) \
+	((((a) > 0) && ((b) > ((maxv) - (a)))) || \
+	 (((a) < 0) && ((b) < ((minv) - (a)))))
+
+/* Make sure that a-b is not smaller than MINV or exceeds MAXV (if b < 0).
+   Assumes that b > 0 if a > 0 and b < 0 if a < 0 */
+#define SUBOVERFLOW(a,b,minv,maxv) \
+	((((b) > 0) && ((a) < ((minv) + (b)))) || \
+	 (((b) < 0) && ((a) > ((maxv) + (b)))))
+
+#endif /* _SH_TYPEMAX_H */
diff --git a/include/unionwait.h b/include/unionwait.h
new file mode 100644
index 0000000..b1b4dfa
--- /dev/null
+++ b/include/unionwait.h
@@ -0,0 +1,98 @@
+/* unionwait.h -- definitions for using a `union wait' on systems without
+   one. */
+
+/* Copyright (C) 1996 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/>.
+*/
+
+#ifndef _UNIONWAIT_H
+#define _UNIONWAIT_H
+
+#if !defined (WORDS_BIGENDIAN)
+union wait
+  {
+    int	w_status;		/* used in syscall */
+
+    /* Terminated process status. */
+    struct
+      {
+	unsigned short
+	  w_Termsig  : 7,	/* termination signal */
+	  w_Coredump : 1,	/* core dump indicator */
+	  w_Retcode  : 8,	/* exit code if w_termsig==0 */
+	  w_Fill1    : 16;	/* high 16 bits unused */
+      } w_T;
+
+    /* Stopped process status.  Returned
+       only for traced children unless requested
+       with the WUNTRACED option bit. */
+    struct
+      {
+	unsigned short
+	  w_Stopval : 8,	/* == W_STOPPED if stopped */
+	  w_Stopsig : 8,	/* actually zero on XENIX */
+	  w_Fill2   : 16;	/* high 16 bits unused */
+      } w_S;
+  };
+
+#else  /* WORDS_BIGENDIAN */
+
+/* This is for big-endian machines like the IBM RT, HP 9000, or Sun-3 */
+
+union wait
+  {
+    int	w_status;		/* used in syscall */
+
+    /* Terminated process status. */
+    struct
+      {
+	unsigned short w_Fill1    : 16;	/* high 16 bits unused */
+	unsigned       w_Retcode  : 8;	/* exit code if w_termsig==0 */
+	unsigned       w_Coredump : 1;	/* core dump indicator */
+	unsigned       w_Termsig  : 7;	/* termination signal */
+      } w_T;
+
+    /* Stopped process status.  Returned
+       only for traced children unless requested
+       with the WUNTRACED option bit. */
+    struct
+      {
+	unsigned short w_Fill2   : 16;	/* high 16 bits unused */
+	unsigned       w_Stopsig : 8;	/* signal that stopped us */
+	unsigned       w_Stopval : 8;	/* == W_STOPPED if stopped */
+      } w_S;
+  };
+
+#endif /* WORDS_BIGENDIAN */
+
+#define w_termsig  w_T.w_Termsig
+#define w_coredump w_T.w_Coredump
+#define w_retcode  w_T.w_Retcode
+#define w_stopval  w_S.w_Stopval
+#define w_stopsig  w_S.w_Stopsig
+
+#define WSTOPPED       0177
+#define WIFSTOPPED(x)  ((x).w_stopval == WSTOPPED)
+#define WIFEXITED(x)   ((x).w_stopval != WSTOPPED && (x).w_termsig == 0)
+#define WIFSIGNALED(x) ((x).w_stopval != WSTOPPED && (x).w_termsig != 0)
+
+#define WTERMSIG(x)    ((x).w_termsig)
+#define WSTOPSIG(x)    ((x).w_stopsig)
+#define WEXITSTATUS(x) ((x).w_retcode)
+#define WIFCORED(x)    ((x).w_coredump)
+
+#endif /* _UNIONWAIT_H */