Add support for EILSEQ errno value.

EILSEQ is required by C95 and later.

equates.asm

@@ -19,6 +19,7 @@ EMFILE   gequ  8                        too many files are open
 EACCES   gequ  9                        access bits prevent the operation
 EEXIST   gequ  10                       the file exists
 ENOSPC   gequ  11                       the file is too large
+EILSEQ   gequ  12                       encoding error
 ;
 ;  masks for the __ctype array
 ;

stdio.asm

@@ -2179,7 +2179,7 @@ rts	creturn 4:s
 ****************************************************************
 *
 perror	start
-maxErr	equ	ENOSPC	max error in sys_errlist
+maxErr	equ	EILSEQ	max error in sys_errlist
 
 s	equ	4	string address
 
@@ -3010,6 +3010,7 @@ sys_errlist start
 	dc	a4'EACCESS'
 	dc	a4'EEXISTS'
 	dc	a4'ENOSPC'
+	dc	a4'EILSEQ'
 
 ! Note: if more errors are added, change maxErr in perror() and strerror().
 
@@ -3025,6 +3026,7 @@ EMFILE	cstr	'too many files are open'
 EACCESS	cstr	'access bits prevent the operation'
 EEXISTS	cstr	'the file exists'
 ENOSPC	cstr	'the file is too large'
+EILSEQ	cstr	'encoding error'
 	end
 
 ****************************************************************

string.asm

@@ -912,7 +912,7 @@ lb2	sty	set	set the disp past the current disp
 ****************************************************************
 *
 strerror start
-maxErr	equ	ENOSPC	max error in sys_errlist
+maxErr	equ	EILSEQ	max error in sys_errlist
 
 	phb		get the error number
 	plx

vars.asm

@@ -31,7 +31,7 @@ _ownerid entry                          user ID (C)
 ~USER_ID entry                          user ID (Pascal, libraries)
          ds    2
 sys_nerr entry                          # of error messages
-         dc    i'12'
+         dc    i'13'
 _toolErr entry                          last error in a tool call (C)
 ~TOOLERROR entry                        last error in a tool call (Pascal)
          ds    2