typeset: add error msgs for incompatible options; improve usage msg

This adds informative error messages if incompatible options are
given. It also documents the exclusive -m, -n and -T options on
separate usage lines, as was already done with -f. The usage
message for incompatible options now looks something like this:

| $ ksh -c 'typeset -L10 -F -f -i foo'
| ksh: typeset: -i/-F/-E/-X cannot be used with -L/-R/-Z
| ksh: typeset: -f cannot be used with other options
| Usage: typeset [-bflmnprstuxACHS] [-a[type]] [-i[base]] [-E[n]]
|                [-F[n]] [-L[n]] [-M[mapping]] [-R[n]] [-X[n]]
|                [-h string] [-T[tname]] [-Z[n]] [name[=value]...]
|    Or: typeset -f [name...]
|    Or: typeset -m [name=name...]
|    Or: typeset -n [name=name...]
|    Or: typeset -T [tname[=(type definition)]...]
|  Help: typeset [ --help | --man ] 2>&1

(see also the previous commit, e21a053e)

Unfortunately the first "Usage" line has some redundancies with the
"Or:" lines showing separate usages. It doesn't seem to be possible
to avoid this; it's a flaw in how libast generates everything
(usage, help, manual) from one huge getopt(3) string. I still think
the three added "Or:" lines are an improvement as it wasn't
previously shown that these options need to be used on their own.

src/cmd/ksh93/bltins/typeset.c: b_typeset():
- Instead of only showing a generic usage message, add an
  informative error message if incompatible options were given.
- Conflicting options detection was failing because NV_LJUST and
  NV_EXPNOTE have the same bitmask value. Use a new 'isadjust'
  flag for -L/-R/-Z to remember if one of these was set.
- Detect conflict between -L/-R/-Z and a float option, not just -i.

src/cmd/ksh93/include/name.h, src/cmd/ksh93/data/msg.c:
- Add the two new error messages for incompatible options.

src/cmd/ksh93/data/builtins.c: sh_opttypeset[]:
- Add a space after 'float' in in "[+float?\btypeset -lE\b]" as
  this makes 'float' appear on its own line, improving formatting.
- Show -m, -n, -T on separate usage lines like -f, as none of these
  can be combined with other options.
- Remove "cannot be combined with other options" from -m and -n
  descriptions, as that should now be clear from the separate usage
  lines -- and even if not, the error message is now informative.

src/cmd/ksh93/sh.1, src/cmd/ksh93/COMPATIBILITY:
- Update.

src/cmd/ksh93/tests/types.sh:
- Remove obsolete test: 'typeset -RF' is no longer accepted.
  (It crashed in 93u+, so this is not an incompatibility...)

Resolves: https://github.com/ksh93/ksh/issues/48

NEWS

@@ -8,6 +8,9 @@ Any uppercase BUG_* names are modernish shell bug IDs.
 - Fixed: executing a DEBUG trap in a command substitution had side effects
   on the exit status ($?) of non-trap commands.
 
+- The typeset builtin command now gives an informative error message if an
+  incompatible combination of options is given.
+
 2021-01-19:
 
 - Fixed a crash when using 'cd' in a virtual/non-forking subshell in a

src/cmd/ksh93/COMPATIBILITY

@@ -68,8 +68,8 @@ For more details, see the NEWS file and for complete details, see the git log.
 9.	The 'print', 'printf' and 'echo' builtin commands now return a nonzero
 	exit status if an input/output error occurs.
 
-10.	The 'unalias' builtin will now return a non-zero status if it tries to
-	remove a previously set alias that is not currently set.
+10.	The 'typeset' builtin now properly detects and reports options that
+	cannot be used together if they are given as part of the same command.
 
 ____________________________________________________________________________
 

src/cmd/ksh93/bltins/typeset.c

@@ -195,7 +195,7 @@ int    b_typeset(int argc,register char *argv[],Shbltin_t *context)
 	const char	*optstring = sh_opttypeset;
 	Namdecl_t 	*ntp = (Namdecl_t*)context->ptr;
 	Dt_t		*troot;
-	int		isfloat=0, shortint=0, sflag=0;
+	int		isfloat=0, isadjust=0, shortint=0, sflag=0;
 
 	memset((void*)&tdata,0,sizeof(tdata));
 	tdata.sh = context->shp;
@@ -297,6 +297,7 @@ int    b_typeset(int argc,register char *argv[],Shbltin_t *context)
 					tdata.argnum = (int)opt_info.num;
 				if(tdata.argnum < 0)
 					errormsg(SH_DICT,ERROR_exit(1), e_badfield, tdata.argnum);
+				isadjust = 1;
 				if(n=='Z')
 					flag |= NV_ZFILL;
 				else
@@ -377,18 +378,36 @@ endargs:
 		argv--;
 	if((flag&NV_ZFILL) && !(flag&NV_LJUST))
 		flag |= NV_RJUST;
-	if((flag&NV_INTEGER) && (flag&(NV_LJUST|NV_RJUST|NV_ZFILL)))
+	if((isfloat || flag&NV_INTEGER) && isadjust)
+	{
+		errormsg(SH_DICT,2,e_optincompat2,"-i/-F/-E/-X","-L/-R/-Z");
 		error_info.errors++;
+	}
 	if((flag&NV_BINARY) && (flag&(NV_LJUST|NV_UTOL|NV_LTOU)))
+	{
+		errormsg(SH_DICT,2,e_optincompat2,"-b","-L/-u/-l");
 		error_info.errors++;
+	}
 	if((flag&NV_MOVE) && (flag&~(NV_MOVE|NV_VARNAME|NV_ASSIGN)))
+	{
+		errormsg(SH_DICT,2,e_optincompat1,"-m");
 		error_info.errors++;
+	}
 	if((flag&NV_REF) && (flag&~(NV_REF|NV_IDENT|NV_ASSIGN)))
+	{
+		errormsg(SH_DICT,2,e_optincompat1,"-n");
 		error_info.errors++;
+	}
 	if((flag&NV_TYPE) && (flag&~(NV_TYPE|NV_VARNAME|NV_ASSIGN)))
+	{
+		errormsg(SH_DICT,2,e_optincompat1,"-T");
 		error_info.errors++;
+	}
 	if(troot==tdata.sh->fun_tree && ((isfloat || flag&~(NV_FUNCT|NV_TAGGED|NV_EXPORT|NV_LTOU))))
+	{
+		errormsg(SH_DICT,2,e_optincompat1,"-f");
 		error_info.errors++;
+	}
 	if(sflag && troot==tdata.sh->fun_tree)
 	{
 		/* static function */

src/cmd/ksh93/data/builtins.c

@@ -1718,7 +1718,7 @@ USAGE_LICENSE
 ;
 
 const char sh_opttypeset[] =
-"+[-1c?\n@(#)$Id: typeset (AT&T Research/ksh93) 2020-07-15 $\n]"
+"+[-1c?\n@(#)$Id: typeset (AT&T Research/ksh93) 2021-01-20 $\n]"
 USAGE_LICENSE
 "[+NAME?typeset - declare or display variables with attributes]"
 "[+DESCRIPTION?Without the \b-f\b option, \btypeset\b sets, unsets, "
@@ -1738,7 +1738,7 @@ USAGE_LICENSE
 "[+?Note also the following builtin command equivalents:]{"
 	"[+autoload?\btypeset -fu\b]"
 	"[+compound?\btypeset -C\b]"
-	"[+float?\btypeset -lE\b]"
+	"[+float ?\btypeset -lE\b]"
 	"[+functions?\btypeset -f\b]"
 	"[+integer?\btypeset -li\b]"
 	"[+nameref?\btypeset -n\b]"
@@ -1768,11 +1768,9 @@ USAGE_LICENSE
 "[l?Without \b-i\b, sets character mapping to \btolower\b. When used "
 	"with \b-i\b, \b-E\b, or \b-F\b indicates long variant.]"
 "[m?Move.  The value is the name of a variable whose value will be "
-	"moved to \aname\a.  The original variable will be unset.  Cannot be "
-	"used with any other options.]"
+	"moved to \aname\a.  The original variable will be unset.]"
 "[n?Name reference.  The value is the name of a variable that \aname\a "
-	"references.  \aname\a cannot contain a \b.\b.  Cannot be used with "
-	"any other options.]"
+	"references.  \aname\a cannot contain a \b.\b.]"
 "[p?Causes the output to be in a format that can be used as input to the "
 	"shell to recreate the attributes for variables.]"
 "[r?Enables readonly.  Once enabled it cannot be disabled.  See "
@@ -1830,6 +1828,9 @@ USAGE_LICENSE
 "\n"
 "\n[name[=value]...]\n"
 " -f [name...]\n"
+" -m [name=name...]\n"
+" -n [name=name...]\n"
+" -T [tname[=(type definition)]...]\n"
 "\n"
 "[+EXIT STATUS?]{"
         "[+0?No errors occurred.]"

src/cmd/ksh93/data/msg.c

@@ -50,6 +50,8 @@ const char e_query[]		= "no query process";
 const char e_history[]		= "no history file";
 const char e_histopen[]		= "cannot open history file";
 const char e_option[]		= "%s: bad option(s)";
+const char e_optincompat1[]	= "%s cannot be used with other options";
+const char e_optincompat2[]	= "%s cannot be used with %s";
 const char e_toomany[]		= "open file limit exceeded";
 const char e_argtype[]		= "invalid argument of type %c";
 const char e_oneoperand[]	= "one operand expected";

src/cmd/ksh93/include/name.h

@@ -230,6 +230,8 @@ extern const Namdisc_t	ENUM_disc;
 extern char		nv_local;
 extern Dtdisc_t		_Nvdisc;
 extern const char	*nv_discnames[];
+extern const char	e_optincompat1[];
+extern const char	e_optincompat2[];
 extern const char	e_subscript[];
 extern const char	e_nullset[];
 extern const char	e_notset[];

src/cmd/ksh93/sh.1

@@ -7799,13 +7799,30 @@ cannot be exported.
 .PD
 .PP
 The
-.B \-i
-attribute cannot be specified along with
+.BR \-i ,
+.BR \-F ,
+.BR \-E ,
+and
+.B \-X
+options cannot be specified along with
 .BR \-R ,
 .BR \-L ,
-.BR \-Z ,
 or
-.BR \-f .
+.BR \-Z .
+The
+.B \-b
+option cannot be specified along with
+.BR \-L ,
+.BR \-u ,
+or
+.BR \-l .
+The
+.BR \-f ,
+.BR \-m ,
+.BR \-n ,
+and
+.B \-T
+options cannot be used together with any other option.
 .PP
 Using
 .B \+

src/cmd/ksh93/tests/types.sh

@@ -639,9 +639,6 @@ bar.foo+=(bam)
 [[ ${bar.foo[0]} == bam ]] || err_exit 'appending to empty array variable in type does not create element 0'
 
 # ======
-# 'typeset -RF' should not create variables that cause crashes
-"$SHELL" -c 'typeset -RF foo=1; test $foo' || err_exit 'typeset -RF does not work'
-
 # Type names that have 'a' as the first letter should be functional
 "$SHELL" -c 'typeset -T al=(typeset bar); al foo=(bar=testset)' || err_exit "type names that start with 'a' don't work"