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Annotation of 41BSD/cmd/apl/documents/APL_MODS, revision 1.1

1.1     ! root        1: 
        !             2: Modifications to APL-
        !             3: 
        !             4:        April, May 1978         UCSF            H. Ross Harvey.
        !             5: 
        !             6: 
        !             7: FILE             DATE                  DESCRIPTION
        !             8: ----             ----                  -----------
        !             9: 
        !            10: a9.c           24-Apr-78       Added I-beam 22: Workspace available
        !            11:                                                 (free) in bytes.
        !            12: 
        !            13:                                Added I-beam 32: Escape to /bin/sh.
        !            14: 
        !            15: apl.h          27-Apr-78       Added control statements for conditional
        !            16: a1.c                           compilation of debug code.  Defining
        !            17: ai.c                           `FULLD', or `SHORTD' will include two
        !            18: aw.c                           levels of debugging information.  The
        !            19:                                default level is none at all.  Do not
        !            20:                                define both FULLD and SHORTD.
        !            21: 
        !            22: a1.c           29-Apr-78       Execute() now references the opnames[] table
        !            23:                                (FULLD version only) to make the debugging
        !            24:                                information somewhat less cryptic.
        !            25: 
        !            26: a0.c           2-May-78        Dealloc() now de-allocates variables of
        !            27:                                type `EL'.  This solves some of the
        !            28:                                ws memory management problems.
        !            29: 
        !            30: a0.c           3-May-78        Aplmod() now preserves the ttymode bits (still
        !            31:                                sets TECO, though).  It was previously very
        !            32:                                presumptious, turning tabs off, even parity
        !            33:                                on (!), etc.
        !            34: 
        !            35: apl.y          11-May-78       Code for labels complete! The lexical
        !            36: ai.c                           analyzer (yylex()+getnam()) and the
        !            37: lex.c                          control routine for function compiles
        !            38:                                (funcomp()) now collaborate and return
        !            39:                                the line number (lexical value `numb')
        !            40:                                whenever a label identifier is encountered.
        !            41:                                An (new) initial pass picks out
        !            42:                                labels `manually' and links them into
        !            43:                                a list of structures which are searched
        !            44:                                by getnam(). This list is discarded
        !            45:                                when the function compile is complete.  
        !            46: 
        !            47: aj.c           11-May-78       Replaced `&end' with `memstart' in
        !            48:                                clear(). Memstart is set by sbrk(0)
        !            49:                                at the beginning of main().  This was
        !            50:                                necessary to allow independant calls
        !            51:                                to sbrk(), spec., in the profiler.
        !            52: 
        !            53: ah.c           16-May-78       Added a command `)SYMBOLS' which prints
        !            54: apl.h                          the namelist and item tables. This command
        !            55: tab.c                          is valid for SHORTD or FULLD versions
        !            56:                                only (see mods of 27-Apr-78).
        !            57: 
        !            58: ad.c           16-May-78       Modified comk() so vector/scaler will
        !            59:                                work if the vector has one element.
        !            60:                                This is usually allowed elsewhere in
        !            61:                                this and other apl's.
        !            62: 
        !            63: aj.c           18-May-78       Wsload() and wssave() now buffer all
        !            64:                                I/O operations; this cuts )LOAD and
        !            65:                                )SAVE times by a factor of four (much
        !            66:                                more on busy systems). Several error
        !            67:                                messages changed.
        !            68: 
        !            69: apl.h          23-May-78       The internal stack is now allocated
        !            70: apl.s (new)                    dynamically.  All but one stack push 
        !            71: a0.c                           operations are handled as calls to the 
        !            72: a1.c (case NAME)               machine-coded routine 'push()'.  If
        !            73: aj.c                           the operation results in an internal
        !            74: an.c                           stack overflow, a new and larger stack
        !            75:                                is allocated, the old stack copied over
        !            76:                                and then freed.  This mod actually
        !            77:                                affects almost every file because each
        !            78:                                '*sp++=expr' was changed to 'push(expr)'.
        !            79: 
        !            80: ai.c           23-May-78       Added insuate() and code to ex_fun()
        !            81:                                to fetch function arguments before
        !            82:                                the function is executed. This was
        !            83:                                necessary to eliminate interactions
        !            84:                                between formal and actual paramenters.
        !            85:                                Previously, a recursive subroutine
        !            86:                                which interchanged its arguments
        !            87:                                between calls would clobber its own
        !            88:                                actual parameters.
        !            89: 
        !            90: a0.c           25-May-78       More I beams. Added the file access
        !            91: a9.c                           system and a shell I beam.
        !            92: apl.h

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