changes.txt

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9.  SLang_free_function added.  If you call SLang_pop_function, then when
    finished, call SLang_free_function.  This does nothing in 1.X but
    may do something in 2.x.
10. src/slrline.c: Keybindings for ESC O A, etc added.
11. src/slsmg.c: SLsmg_write_nstring: avoid many loops if an extremely
    large value is passed (> 0x7FFFFFFF).
12. src/slregexp.c made thread safe
13. src/slsmg.c: Cursor was not always properly positioned when
    after SLsmg_touch_lines called.
14. If terminal does not have erase to eol capability, then use spaces.
15. doc/tm/strops.sl: doc for strcat updated to reflect its ability to
    concatenate N strings.
16. Documentation updated to indicate that floating point range arrays
    are open intervals such that [a:b] does not include b.  slarray.c
    was modified to enforce this specification.  Previously, whether
    or not b was included in the interval was indeterminate.
17. src/slsmg.c: bug involving SLsmg_set_screen_start fixed.
18. src/slparse.c: parser was failing to catch misplaced `}'.

Changes since 1.3.10
1.  If a floating point exception occurs and the OS allows the library
    to handle it without forcing a longjmp, then SL_FLOATING_EXCEPTION
    will get generated instead of SL_INTRINSIC_ERROR.  Note: Linux
    provides no way to handle floating point exceptions without
    forcing a longjmp.  In my opinion, this is a flaw.
2.  SLang_pop_double was returning the wrong value for short and
    character types.
3.  New intrinsic: is_struct_type(X) ==> non-zero is X is a struct.
4.  typecast operation from user defined type to Struct_Type added.
5.  slkeypad.c: DOS/Windows DELETE_KEY definition added (Doug Kaufman
    <[e-mail]>)
6.  slposdir.c: Do not depend upon the existence of rmdir on VMS
    systems.
7.  slang.c: abs, sign, mul2, chs, sqr were not being treated as
    function calls.
8.  sldisply.c:SLtt_cls:  If the terminal is a color terminal but
    being used as a black and white terminal, then reset colors before
    clearing.
9.  path_sans_extname intrinsic added.
10. slimport.c: If module defines deinit_NAME, will be be called prior
    to unloading the module. (Ulrich Dessauer <[e-mail]>)

Changes since 1.3.9
0.  typedef unsigned short SLsmg_Char_Type added to slang.h.
    Applications that access SLsmg functions read/write_raw and
    SLsmg_char_at should use SLsmg_Char_Type unstead of unsigned short
    because this will be changed to unsigned long in version 2.0.

1.  Documentation patches from Vlad Harchev <[e-mail]> added.
2.  slstring.c:  offsetof(SLstring,bytes) -->
    offsetof(SLstring,bytes[0]) to avoid compiler warning on some
    systems.
3.  slcmplex.c: an int was used where a double should have beed used.
4.  egcs g++ was optimizing slang.c:SLclass_push_ptr_obj away because
    it was declared as inline.  In my opinion, this is another g++ bug.
5. sscanf intrinsic added.  See docs.
6. SLmake_lut rewritten to correct incorrect handling of ranges with a
   hyphen at the end.
7. Small bug involving non-BCE terminals in SLsmg_set_color_in_region
   fixed.
8. Functions SLcomplex_asinh/acosh/atanh implemented.
9. install-elf will nolonger install .h files twice.
10. @Struct_Type may be used to create a struct.
12. X[i]++, X[i]-=Y, etc implemented.
13. Much of slw32tty.c rewritten to fix several bugs in the win32 tty
    support.  In addition, if SLgetkey_map_to_ansi(1) has been called,
    then function and arrow keys will produce escape sequences that
    allow one to distinguish alt, ctrl, and shift function keys.
14. OS/2 specific typo in slposdir.c corrected (Eddie Penninkhof
    <[e-mail]>).
15. slang.c:add_slang_function: On the very rare occasion that this
    function failed, memory would get freed twice.

Changes since 1.3.8
1. Color was not enabled on VMS.
2. If MAKE_INTRINSIC was used to declare a function which takes
   arguments, then a typecast error would result when the function was
   called.  New programs should not use MAKE_INTRINSIC since it
   bypasses argument type-checking.
3. src/sl-feat.h: SLTT_XTERM_ALWAYS_BCE variable added to force the
   assumption of the bce (background-color-erase) capability of xterm.
   The default is 0, which means to accept the terminfo setting.
   To force it to 1 during run-time, set the COLORTERM_BCE environment
   variable.  This is useful when using, e.g., rxvt to login to a
   solaris system where the terminfo file will probably not indicate
   bce.
4. SLw32tty.c:SLang_init_tty: Open CONIN$ instead of using
   GetStdHandle.  This is necessary if stdin has been redirected.
5. SLposdir.c: Stat structure contains new field `st_opt_attrs' that
   may be used to contain system specific information that `struct
   stat' does not provide.  In particular, under win32, this field
   contains the file attributes, e.g., whether or not a file is
   hidden.
6. Appropriate typecasts added to avoid warnings on systems that do not 
   support `void *'.
7. Characters in the range 128-255 are allowed in identifiers.
8. Correction to the documentation for SLang_init_tty (Ricard Sierra
   <[e-mail]>).
9. SLANG_END_*_TABLE macros added to quiet silly egcs compiler warnings.
10. typo in sltime.c caused it not to compile under Ultrix.
11. Speed improvement of binary operations involving arrays,
    particularly when used in conjunction with the __tmp function.
12. traceback messages include the filename containing the function
13. File local intrinsic variable `_auto_declare' added.  If non-zero, 
    any undefined global variable will be given static scope.
14. __uninitialize intrinsic function added.
15. listdir was returning NULL on empty directories.  It has been
    changed to return String_Type[0].  It will return NULL upon error.
16. slang.h: if __unix is defined, then also define __unix__ (Albert
    Chin-A-Young <[e-mail]>).
17. foreach using extended to File_Type objects.  See documentation.
18. Tweak to the inner-product operator such that if A is a vector,
    and B is a 2-d matrix, then A will be regarded as a 2-d matrix
    with 1 column.

Changes since 1.3.7
0. configure script updated to autoconf 2.13.  If /usr/include/slang.h
   exists, then the default prefix will be set to /usr.
1. Compile error fixed if _SLANG_HAS_DEBUG_CODE is 0.
2. Bug fix involving typecast(Array_Type, Any_Type).
3. __IBMC__ patches from Eddie Penninkhof <[e-mail]>.
4. If A = Assoc_Type[] (Any_Type array), then A[x] automatically
   dereferences the Any_Type object.
5. Bug fixed involving Assoc_Type optimization cache.
6. Tweaks to SLtt_smart_puts for improved performace.
7. array_map modifed such that the first array in its argument list
   controls the number of elements in the output array.  This is a
   backward compatible change and makes the function more flexible.
8. Additional tweaks to speedup array inary functions if
   _SLANG_OPTIMIZE_FOR_SPEED > 1.
9. Patch from Thomas Henlich <[e-mail]> fixing
   a problem with the `SLang_define_case' function, which allows
   customization of the upper/lower case tables.
10. strtrans and str_delete_chars intrinsic functions added.
11. tweaks to interpreter for some additional speed.

Changes since 1.3.6
1. Added a modified version of a patch from Martynas Kunigelis
   <[e-mail]> to allow writes to the lower left
   corner.
2. SIZEOF_LONG changed to 4 for VMS alpha systems (Jouk Jansen
   <[e-mail]>).
3. MSC patches from [e-mail] (Paul Moore).  He also
   contributed code for listdir with MSC.
4. SLsmg.c: Background color erase tweaks for terminals that lack this
   capability.
5. Fixed a NULL pointer dereference when doing Struct_Type[2][0].
6. Added slsh/scripts/ls and slsh/scripts/badlinks.  `ls' is designed
   for non-Unix systems and `badlinks' finds all symbolic links in
   specified directories that point to non-existent files.
7. SLang_Version_String and intrinsic variable _slang_version_string
   added.
8. stat_file modified under win32 such that a trailing `\' is stripped
   if present.
9. stat_is intrinsic modified to return a character instead of an
   integer.
10. The matrix-multiplication operator `#' now performs inner-products
    on arrays, e.g.,  if A and B arrays:
         A = A_i..jk
	 B = B_kl..m
    Then, (A#B)_i..jl..m = A_i..jk B_kl..m where k is summed over.
    This means that `#' is a matrix multiplication operator for 2-d
    arrays, and acts as a dot-product operator for 1-d arrays.
    In the process, it has been extended to complex numbers.

11. _reshape intrinsic function added.  Unlike `reshape', this
    function creates a new array and returns it.
12. Array indexing via characters works again, e.g., A['a'].
   
Changes since 1.2.2
0. New assignment operators: *= /= &= |=
   The addition of these operators meant that some of the internal
   byte-codes had to be modified.  This change should only cause
   problems with byte-compiled or preprocessed .sl files.  As far as I
   know, only the JED editors uses this feature.  So, after upgrading
   the library, and before running JED, do the equivalent of
   
        rm $JED_ROOT/lib/*.slc

   That is, delete the byte-compiled .slc files.

1. Now the language supports `!if ... else' statements.  
2. New intrinsics: 

       __is_initialized:  This may be used to see whether or
          not a variable is initialized, e.g, __is_initialized (&variable);
       __get_reference: Returns a reference to an object with a
          specified name.
       rmdir, rename, remove (slfile.c): these return 0 upon success, -1 upon
          failure and set errno
       getpid, getgid, getppid (slunix.c)
       _typeof: This is similar to `typeof' except in the case of
          arrays where it returns the data type of the array
       __pop_args, __push_args: see documentation
       fseek, ftell, and symbolic constants SEEK_END, SEEK_CUR, SEEK_SET
       sleep
       usage

3. `Conj' function added to get the complex conjugate
4. New array module that implementes additional array functions, e.g.,
   transpose, matrix multiplication, etc...  Use `SLang_init_array' to
   initialize.
5. An array such as [[1,2,3],[4,5,6]] is interpreted as a 2-row
   3-column array.
6. Amiga patches from J鰎g Strohmayer <[e-mail]>.
7. New table types:

       SLang_IConstant_Type
       SLang_DConstant_Type
       
   These are useful for defining symbolic constants.  See slmath.c and
   slfile.c for examples of their use.

8. A new pseudo-function: __tmp
   This `function' takes a single argument, a variable, and returns
   the value of the variable, and then undefines the variable.  For
   example,
   
        variable x = 3;
	variable y;
	y = __tmp(x);

   will result in `y' having a value of `3' and `x' will be undefined.
   The purpose of this pseudo-function is to free any memory
   associated with a variable if that variable is going to be
   re-assigned.  For example, consider:

        variable x = [1:10:0.1];
        x = 3*x^2 + 2;

    At the time of the re-assignment of `x' in the last statement, two
    arrays will exist.  However,

        x = 3*__tmp(x)^2 + 2;
    
    results in only one array at the time of the assignment, because
    the original array associated with `x' will have been deleted.  This
    function is a pseudo-function because a syntax error results if
    used like
    
        __tmp (sin(x));

9.  New low-level push/pop functions that are designed specifically
    for use in constructing the push/pop methods of application
    defined data types.  These functions have names of the form:
    
        SLclass_push_*_obj
        SLclass_pop_*_obj
	
    where * represents int, long, char, short, ptr, double, float.
    See sltypes.c to see how they are used by, e.g., SLANG_INT_TYPE.

10. New module import facility.  See modules subdirectory for
    examples.  To enable this, use

        SLang_init_module
	
    in you application.  Modules will be searched in the following order
    
        1.  Along the path specified by the `set_import_module_path'
	    function, or by the C functiion SLang_set_module_load_path.
	2.  Along the path given by the SLANG_MODULE_PATH environment 
	    variable.
	3.  Along a system dependent path, e.g., LD_LIBRARY_PATH
        4.  In the current directory.

    New interpreter intrinsics include:
    
        import (String_Type MODULE_NAME);
	set_import_module_path (String_Type PATH);
	String_Type get_import_module_path ();

11.  New integer and floating point types added to the language.  Now
     all basic C signed and unsigned integer types are supported:

       C bindings             S-Lang bindings
       ---------------------------------------
       SLANG_CHAR_TYPE        Char_Type
       SLANG_UCHAR_TYPE       UChar_Type
       SLANG_SHORT_TYPE       Short_Type
       SLANG_USHORT_TYPE      UShort_Type
       SLANG_INT_TYPE         Int_Type
       SLANG_UINT_TYPE        UInt_Type
       SLANG_LONG_TYPE        Long_Type
       SLANG_ULONG_TYPE       ULong_Type
       SLANG_FLOAT_TYPE       Float_Type
       SLANG_DOUBLE_TYPE      Double_Type
       
    For example, `Long_Type[10]' creates an array of 10 longs.

12. New intrinsic: set_struct_field.  See function reference for more
    info.

----- snapshot slang1.3_981030 made available -----

13. Type synonyms added: 

        Int16_Type, UInt16_Type   (16 bit (un)signed integer)
        Int32_Type, UInt32_Type   (32 bit (un)signed integer)
        Int64_Type, UInt64_Type   (64 bit (un)signed integer)
        Float32_Type              (32 bit float)