Language/OS - Multiplatform Resource Library/LANGUAGE OS.iso/rexx/imc/rexx-imc.5/README.versions

Text File | 1993-06-25 | 7.2 KB | 148 lines

alpha1.2 6 Aug 1992  - initial release

alpha1.3 17 Sep 1992 - fixes the following problems:

   * Installation instructions too brief and not clear enough
   * Error incorrectly reported on the following code format:
       select
           when a
          then ...
       when b
          then ...
       end
   * Clause tracing did not strip leading tabs.
   * Special variable SIGL not set on calling an internal routine
   * Second parameter of bitxxx() was required; should be optional
   * pos, lastpos, wordpos gave error when the needle was empty
   * sign('-0') = -1 (should be 0)
   * sign() left extra value on calculator stack, causing surprises
   * subword(" to be or not to be ",7) caused crash; similarly for
     word and wordlength
   * symbol() gave incorrect results;
   * translate(x,"") mistook the empty string for an omitted argument
   * wordindex(string,n) gave non-zero when string contained n-1 words
   * x2d() did not recognise second parameter
   * arg() gave "4", not "2" when arguments were: func(1,2,,)
   * binary strings were too restricted (i.e. a multiple of 8 digits and
     no spaces)
   * "DO for=forever" interpreted FOREVER as reserved
   * PROCEDURE EXPOSE used commas as separators instead of spaces
   * date('U') gave wrong day number
   * Leading and trailing spaces were allowed in hex constants
   * Priorities of implicit concatenation, space operator and unary operators
     were wrong
   * random(n,n) returned error; should return n
   * Memory fault occurred after 63 nested PROCEDURE instructions
   * expression after PUSH and QUEUE was required
   * "rxstack" sometimes exited before giving the stack a chance to catch up;
     after that queued() would slowly rise up to its correct value.

beta1.4 13 May 1993 - fixes the following problems:

   * Mathematical function name discrepancy between rxmathfn.c and rxfn.c
     now fixed
   * Intermittent "Routine not found" error when using external functions
     now fixed
   * Case of labels is now preserved in "trace l"
   * "parse var a.b" gave "?.B" when a.b undefined, now gives "A.B"
   * "parse var" now signals to NOVALUE when variable is undefined
   * stem. is now different from stem.""
   * "stem.=5; drop stem.5; say stem. stem.5" now says "5 STEM.5" (did say
     "5 5")
   * Control variable in a loop is interpreted on each pass, and END, LEAVE
     and ITERATE compare symbol names literally.
   * INTERPRET changed to detect incomplete DO/SELECT blocks
   * SELECT (and WHEN) changed to reject multiple statements in WHEN clauses
   * "do name=expri ..." changed to assign "expr + 0" to "name" instead of
     just "expr".
   * UNTIL conditions are tested before incrementing the control variable
   * WHILE/UNTIL checking "modernised" ;-)
   * "procedure expose (varlist)" implemented
   * Fixed uninitialised char* pointer in rxchars2() which made lines()
     sometimes bomb out with segmentation fault
   * Fixed "Unexpected THEN/ELSE" error report for instructions of form
     "otherwise if (cond) then ..."
   * Amended rxmathfn.exec to use single instructions in WHEN clauses
   * Fixed multiplication to say "Arithmetic Overflow" instead of "Invalid
     whole number" when overflow occurs
   * Fixed stacknum() to report error on too-large exponents - it previously
     stacked an erroneous value instead.
   * Fixed sqrt() to work with argument zero
   * Fixed EXIT instruction to record size of new calculator stack
     (previous code occasionally caused hard-to-trace memory crashes)
   * chars(file) calls stat to return the size of file when it is not open
   * chars() now takes into account characters buffered by stdio
   * NUMERIC settings saved across function calls
   * "parse numeric" now works
   * Changed the sqrt() function in rxmathfn.exec
   * Fixed formatting to obey 2*DIGITS rule for small numbers
   * Fixed format() to obey 2*expt rule, also to round the number on input

REXX/imc-beta-1.5 4.00 25 Jun 1993 has the following changes:

   * Fixed two erroneous source lines which choke sensitive compilers
   * Distinguished between AIX cc and AIX gcc in the Makefile
   * made "do 3=i" an error instead of a counted loop
   * made "a==4" an error instead of a command
   * Message 15 last word changed from "constant" to "string"
   * '414243'x(3) is now a function call (was abuttal)
   * allowed tab characters in hex and binary strings
   * implemented "drop (list)"
   * Added STUFF_STACK preprocesor symbol
   * Fixed traceback and related things so that, for instance, running
     main.exec, where main, foo and bar are as follows:

     main.exec                   foo.exec                          bar.exec

     /* call an OK program */    /* call an erroneous program */   /* error */
     call foo                    say "Entered FOO"                 return a+b
                                 say bar()
                                 say "Leaving FOO"
                                 return

     produces the following output:

     Entered FOO
         2 +++  return a+b
     Error 41 running /tmp/bar.exec, line 2: Bad arithmetic conversion
         3 +++  say bar()
     Error 50 running /tmp/foo.exec, line 3: Error in called routine
         2 +++ call foo
     Error 50 running /tmp/main.exec, line 2: Error in called routine

     whereas only the first four lines would previously have been displayed.
     Similarly, traceback is printed for an error in an external routine
     even when the error is trapped in the calling program.

   * Removed the RC messages from error reports such as the above, because
     they were pointless.
   * Changed the format of RC messages from "RC(n)" to "RC=n"
   * Implemented the third parameter of justify()
   * Corrected "parse version" to show a language level as second token
     instead of the interpreter version.
   * Corrected mtest() to keep the old value if realloc fails
   * Rewrote the tokeniser and amended various parts of the interpreter to
     use the new program format
   * Implemented the "name" subkeyword of "signal on"
   * implemented the "failure" and "notready" conditions
   * Added command line option processing
   * Added extra signal handlers to make the interpreter die more cleanly
   * Implemented "call on"
   * Implemented the "condition" builtin function
   * Made "Unexpected '*/'" a separate (nonstandard) error message
   * Trace instructions now ignored in program if interactive tracing is on
   * Implemented "tracefile=" option
   * Improved chars() and lines() for non-open files to get more information
     and raise notready if appropriate.  Improved lines() for persistent
     files to return the correct result (and not just 0 or 1).
   * Deleted ioerr().  RC is no longer set when notready is raised.
   * Fixed the return values of charout() [would sometimes return a null
     string or an incorrect value of 1 if an error occurred].
   * File I/O functions now give error when the file is an empty string.
   * Implemented the stream() function with commands close, fdopen, fileno,
     flush, ftell, open, pclose and popen.
   * Changed rexxtest.exec to use the stream() function instead of all those
     other ones.
   * Changed REXXPATH to REXXIMC and implemented the search so that this
     environment variable is no longer necessary.