Fix more compiler warnings, typos and other minor issues (#260)

Many of these changes are minor typo fixes. The other changes
(which are mostly compiler warning fixes) are:

NEWS:
- The --globcasedetect shell option works on older Linux kernels
  when used with FAT32/VFAT file systems, so remove the note about
  it only working with 5.2+ kernels.

src/cmd/ksh93/COMPATIBILITY:
- Update the documentation on function scoping with an addition
  from ksh93v- (this does apply to ksh93u+).

src/cmd/ksh93/edit/emacs.c:
- Check for '_AST_ksh_release', not 'AST_ksh_release'.

src/cmd/INIT/mamake.c,
src/cmd/INIT/ratz.c,
src/cmd/INIT/release.c,
src/cmd/builtin/pty.c:
- Add more uses of UNREACHABLE() and noreturn, this time for the
  build system and pty.

src/cmd/builtin/pty.c,
src/cmd/builtin/array.c,
src/cmd/ksh93/sh/name.c,
src/cmd/ksh93/sh/nvtype.c,
src/cmd/ksh93/sh/suid_exec.c:
- Fix six -Wunused-variable warnings (the name.c nv_arrayptr()
  fixes are also in ksh93v-).
- Remove the unused 'tableval' function to fix a -Wunused-function
  warning.

src/cmd/ksh93/sh/lex.c:
- Remove unused 'SHOPT_DOS' code, which isn't enabled anywhere.
  https://github.com/att/ast/issues/272#issuecomment-354363112

src/cmd/ksh93/bltins/misc.c,
src/cmd/ksh93/bltins/trap.c,
src/cmd/ksh93/bltins/typeset.c:
- Add dictionary generator function declarations for former
  aliases that are now builtins (re: 1fbbeaa1, ef1621c1, 3ba4900e).
- For consistency with the rest of the codebase, use '(void)'
  instead of '()' for print_cpu_times.

src/cmd/ksh93/sh/init.c,
src/lib/libast/path/pathshell.c:
- Move the otherwise unused EXE macro to pathshell() and only
  search for 'sh.exe' on Windows.

src/cmd/ksh93/sh/xec.c,
src/lib/libast/include/ast.h:
- Add an empty definition for inline when compiling with C89.
  This allows the timeval_to_double() function to be inlined.

src/cmd/ksh93/include/shlex.h:
- Remove the unused 'PIPESYM2' macro.

src/cmd/ksh93/tests/pty.sh:
- Add '# err_exit #' to count the regression test added in
  commit 113a9392.

src/lib/libast/disc/sfdcdio.c:
- Move diordwr, dioread, diowrite and dioexcept behind
  '#ifdef F_DIOINFO' to fix one -Wunused-variable warning and
  multiple -Wunused-function warnings (sfdcdio() only uses these
  functions when F_DIOINFO is defined).

src/lib/libast/string/fmtdev.c:
- Fix two -Wimplicit-function-declaration warnings on Linux by
  including sys/sysmacros.h in fmtdev().

src/lib/libast/RELEASE

@@ -283,7 +283,7 @@
 08-12-07 include/ast_std.h,misc/getenv.c: no _ast_getenv for uwin ast54 compatibility
 08-12-07 tm/tmxfmt.c: add %[_][EO]K for [space pad] [full|long] iso
 08-12-07 sfio/sfvscanf.c: fix ok[] short by one allocation
-08-12-07 comp/setlocale.c: fix off by one composite initialition loop test
+08-12-07 comp/setlocale.c: fix off by one composite initialization loop test
 08-12-07 path/pathkey.c: fix off by one loop test
 08-12-04 vmalloc/vmbest.c: catch sbrk() wraparound
 08-12-04 comp/spawnveg.c: clean up attrs on failure too

src/lib/libast/disc/sfdcdio.c

@@ -42,6 +42,8 @@ typedef struct _direct_s
 /* convert a pointer to an int */
 #define P2I(p)	(Sfulong_t)((char*)(p) - (char*)0)
 
+#ifdef F_DIOINFO
+
 #if __STD_C
 static ssize_t diordwr(Sfio_t* f, Void_t* buf, size_t n, Direct_t* di, int type)
 #else
@@ -59,7 +61,6 @@ int		type;
 	done = 0;	/* amount processed by direct IO */
 	rv = 0;
 
-#ifdef F_DIOINFO
 	if((P2I(buf)%di->dio.d_mem) == 0 &&
 	   (f->here%di->dio.d_miniosz) == 0 && n >= di->dio.d_miniosz )
 	{	/* direct IO ok, make sure we're in the right mode */
@@ -92,7 +93,6 @@ int		type;
 		di->cntl &= ~FDIRECT;
 		(void)fcntl(f->file, F_SETFL, di->cntl);
 	}
-#endif /*F_DIOINFO*/
 
 	if((rw = n-done) > 0 &&
 	   (rv = type == SF_READ ? read(f->file,buf,rw) : write(f->file,buf,rw)) > 0 )
@@ -141,18 +141,18 @@ Sfdisc_t*	disc;
 
 	if(type == SF_FINAL || type == SF_DPOP)
 	{
-#ifdef F_DIOINFO
 		if(di->cntl&FDIRECT)
 		{	di->cntl &= ~FDIRECT;
 			(void)fcntl(f->file,F_SETFL,di->cntl);
 		}
-#endif
 		free(disc);
 	}
 
 	return 0;
 }
 
+#endif /* F_DIOINFO */
+
 #if __STD_C
 int sfdcdio(Sfio_t* f, size_t bufsize)
 #else

src/lib/libast/include/ast.h

@@ -202,6 +202,14 @@ typedef struct
 #define FMT_EXP_NOCR	0x100		/* skip \r			*/
 #define FMT_EXP_NONL	0x200		/* skip \n			*/
 
+/*
+ * Define inline as an empty macro if we are
+ * compiling with C89.
+ */
+#if __STDC_VERSION__ < 199901L
+#define inline
+#endif
+
 /*
  * multibyte macros
  */

src/lib/libast/man/ast.3

@@ -226,7 +226,7 @@ outputs an
 prompt specified by
 .I "format, .\|.\|."
 to the controlling terminal and reads a response from the controlling terminal.
-Offirmative response returns
+Affirmative response returns
 .LR 0 ,
 .L EOF
 or quit response returns

src/lib/libast/man/ftwalk.3

@@ -69,7 +69,7 @@ That is, \fIuserf\fP is called on a directory only after its descendants have
 been processed.
 The absence of this bit indicates that calls to the user functions
 are issued in preorder. That is, \fIuserf\fP is
-called on a directory before its descendants  are processed.
+called on a directory before its descendants are processed.
 .IP
 FTW_PHYSICAL: Use \fIlstat\fR(2) instead of \fIstat\fR(2) to get
 file status and allow detection of symbolic links.

src/lib/libast/man/sfio.3

@@ -696,7 +696,7 @@ may result in undefined behavior.
 .PP
 .Ss "  int sfgetc(Sfio_t* f)"
 .Ss "  int sfputc(Sfio_t* f, int c)"
-These functions read/write a byte  from/to stream \f5f\fP.
+These functions read/write a byte from/to stream \f5f\fP.
 \f5sfgetc()\fP returns the byte read or \f5-1\fP on error.
 \f5sfputc()\fP returns \f5c\fP on success and \f5-1\fP on error.
 
@@ -2356,8 +2356,8 @@ symbol may be removed in a future release.
 The printing and scanning functions were extended to handle multibyte characters
 and to conform to the C99 standard.
 .PP
-The function \f5sfpoll()\fP was rehauled to make it useful
-for writing servers that must commnunicate with multiple streams
+The function \f5sfpoll()\fP was overhauled to make it useful
+for writing servers that must communicate with multiple streams
 without blocking.
 .PP
 The formatting pattern \f5%c\fP for \f5sf*printf\fP was extended

src/lib/libast/man/vmalloc.3

@@ -284,7 +284,7 @@ events in a \fIregion\fP.
 There are two standard disciplines, both with \f5round\fP being 0 and \f5exceptf\fP being \f5NULL\fP.
 .TP
 .MW Vmdcsystem
-A discipline whose \f5memoryf\fP function gets space from  the operation system
+A discipline whose \f5memoryf\fP function gets space from the operation system
 via different available methods which include \fImmap(2)\fP, \fIsbrk(2)\fP and
 functions from the WIN32 API.
 For historical reason, \fIVmdcsbrk\fP is also available and functions like \fIVmdcsystem\fP.
@@ -523,7 +523,7 @@ A \f5Vmstat_t\fP structure has at least these members:
 .MW "size_t	m_free;	/* maximum free block size */
 .MW "int	n_seg;	/* count of segments */
 .MW "size_t	extent;	/* memory extent of region */
-.MW "int	n_region; /* total Malloc regions  */
+.MW "int	n_region; /* total Malloc regions */
 .MW "int	n_open; /* non-blocked operations */
 .MW "int	n_lock; /* blocked operations */
 .MW "int	n_probe; /* region searches */

src/lib/libast/path/pathshell.c

@@ -47,6 +47,12 @@
  *       not done for `csh script arg ...'
  */
 
+#ifdef _WINIX
+#	define EXE "?(.exe)"
+#else
+#	define EXE
+#endif
+
 char*
 pathshell(void)
 {
@@ -59,13 +65,13 @@ pathshell(void)
 
 	static char*	val;
 
-	if ((sh = getenv("SHELL")) && *sh == '/' && strmatch(sh, "*/(sh|*[!cC]sh)*([[:digit:]])?(-+([.[:alnum:]]))?(.exe)"))
+	if ((sh = getenv("SHELL")) && *sh == '/' && strmatch(sh, "*/(sh|*[!cC]sh)*([[:digit:]])?(-+([.[:alnum:]]))" EXE))
 	{
 		if (!(ru = getuid()) || !eaccess("/bin", W_OK))
 		{
 			if (stat(sh, &st))
 				goto defshell;
-			if (ru != st.st_uid && !strmatch(sh, "?(/usr)?(/local)/?([ls])bin/?([[:lower:]])sh?(.exe)"))
+			if (ru != st.st_uid && !strmatch(sh, "?(/usr)?(/local)/?([ls])bin/?([[:lower:]])sh" EXE))
 				goto defshell;
 		}
 		else

src/lib/libast/sfio/sfvscanf.c

@@ -57,7 +57,7 @@ int*	peek;
 }
 
 /* buffer used during scanning of a double value or a multi-byte
-   character. the fields mirror certain local variables in sfvscanf.  */
+   character. the fields mirror certain local variables in sfvscanf. */
 typedef struct _scan_s
 {	int	error;	/* get set by _sfdscan if no value specified	*/
 	int	inp;	/* last input character read			*/

src/lib/libast/string/fmtdev.c

@@ -30,6 +30,9 @@
 #include <ast.h>
 #include <ctype.h>
 #include <ls.h>
+#ifdef __linux__
+#include <sys/sysmacros.h>
+#endif
 
 char*
 fmtdev(struct stat* st)

src/lib/libast/uwin/crypt.c

@@ -465,7 +465,7 @@ static C_block	PC2ROT[2][64/CHUNKBITS][1<<CHUNKBITS];
 /* Initial permutation/expansion table */
 static C_block	IE3264[32/CHUNKBITS][1<<CHUNKBITS];
 
-/* Table that combines the S, P, and E operations.  */
+/* Table that combines the S, P, and E operations. */
 static long SPE[2][8][64];
 
 /* compressed/interleaved => final permutation table */

src/lib/libast/uwin/erf.c

@@ -248,7 +248,7 @@ sc1  =	 9.97395106984001955652274773456e+000,
 sc2  =	 2.80952153365721279953959310660e+001,
 sc3  =	 2.19826478142545234106819407316e+001;
 /*
- * Coefficients for approximation to  erfc in [4,28]
+ * Coefficients for approximation to erfc in [4,28]
  */
 static double
 rd0  =	-2.1491361969012978677e-016,	/* includes lsqrtPI_lo */
@@ -280,7 +280,7 @@ extern double erf(x)
 	if (ax < .84375) {
 	    if (ax < 3.7e-09) {
 		if (ax < 1.0e-308)
-		    return 0.125*(8.0*x+p0t8*x);  /*avoid underflow */
+		    return 0.125*(8.0*x+p0t8*x);  /* avoid underflow */
 		return x + p0*x;
 	    }
 	    y = x*x;

src/lib/libast/uwin/exp.c

@@ -165,7 +165,7 @@ double x;
 
 #endif
 
-/* returns exp(r = x + c) for |c| < |x| with no overlap.  */
+/* returns exp(r = x + c) for |c| < |x| with no overlap. */
 
 double __exp__D(x, c)
 double x, c;

src/lib/libast/uwin/expm1.c

@@ -166,7 +166,7 @@ double x;
 	/* end of x < lnhuge */
 
 	else 
-	/*  expm1(INF) is INF, expm1(+big#) overflows to INF */
+	/* expm1(INF) is INF, expm1(+big#) overflows to INF */
 	    return( finite(x) ?  scalb(one,5000) : x);
 }
 

src/lib/libast/uwin/log1p.c

@@ -57,7 +57,7 @@ static char sccsid[] = "@(#)log1p.c	8.1 (Berkeley) 6/4/93";
  * Method :
  *	1. Argument Reduction: find k and f such that 
  *			1+x  = 2^k * (1+f), 
- *	   where  sqrt(2)/2 < 1+f < sqrt(2) .
+ *	   where sqrt(2)/2 < 1+f < sqrt(2) .
  *
  *	2. Let s = f/(2+f) ; based on log(1+f) = log(1+s) - log(1-s)
  *		 = 2s + 2/3 s**3 + 2/5 s**5 + .....,

src/lib/libast/vmalloc/malloc.c

@@ -267,7 +267,7 @@ static int vmflinit()
 	return 0;
 }
 
-/* use multiple regions to reduce blocking by concurrent threads  */
+/* use multiple regions to reduce blocking by concurrent threads */
 #if _mem_mmap_anon || _mem_mmap_zero
 static Vmalloc_t	*Region[64];	/* list of concurrent regions	*/
 static unsigned int	Regmax = 64;	/* max number of regions	*/

src/lib/libast/vmalloc/vmhdr.h

@@ -430,7 +430,7 @@ struct _seg_s
 #define DB2BEST(d)	((Vmuchar_t*)(d) - 2*sizeof(Head_t))
 #define DB2DEBUG(b)	((Vmuchar_t*)(b) + 2*sizeof(Head_t))
 
-/* set file and line number, note that DBLN > 0 so that DBISBAD will work  */
+/* set file and line number, note that DBLN > 0 so that DBISBAD will work */
 #define DBSETFL(d,f,l)	(DBFILE(d) = (f), DBLN(d) = (f) ? (l) : 1)
 
 /* set and test the state of known to be corrupted */