File:  [gforth] / gforth / kernel / nio.fs
Revision 1.12: download - view: text, annotated - select for diffs
Fri Oct 22 20:46:10 1999 UTC (24 years, 5 months ago) by anton
Branches: MAIN
CVS tags: HEAD
base<2 is now treated correctly
documentation changes

    1: \ Number IO
    2: 
    3: \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: 
   21: require ./io.fs
   22: 
   23: : pad    ( -- c-addr ) \ core-ext
   24:     \G @var{c-addr} is the address of a transient region that can be
   25:     \G used as temporary data storage. At least 84 characters of space
   26:     \G is available.
   27:     here word-pno-size + aligned ;
   28: 
   29: \ hold <# #> sign # #s                                 25jan92py
   30: 
   31: : hold    ( char -- ) \ core
   32:     \G Used within @code{<#} and @code{#>}. Append the character
   33:     \G @var{char} to the pictured numeric output string.
   34:     -1 chars holdptr +!
   35:     holdptr @ dup holdbuf u< -&17 and throw
   36:     c! ;
   37: 
   38: : <# ( -- ) \ core	less-number-sign
   39:     \G Initialise/clear the pictured numeric output string.
   40:     holdbuf-end dup holdptr ! holdend ! ;
   41: 
   42: : #>      ( xd -- addr u ) \ core	number-sign-greater
   43:     \G Complete the pictured numeric output string by
   44:     \G discarding xd and returning addr u; the address and length
   45:     \G of the formatted string. A Standard program may modify characters
   46:     \G within the string.
   47:     2drop holdptr @ holdend @ over - ;
   48: 
   49: : <<# ( -- ) \ gforth	less-less-number-sign
   50:     \G Start a hold area that ends with @code{#>>}. Can be nested in
   51:     \G each other and in @code{<#}.  Note: if you do not match up the
   52:     \G @code{<<#}s with @code{#>>}s, you will eventually run out of
   53:     \G hold area; you can reset the hold area to empty with @code{<#}.
   54:     holdend @ holdptr @ - hold
   55:     holdptr @ holdend ! ;
   56: 
   57: : #>> ( -- ) \ gforth	number-sign-greater-greater
   58:     \G Release the hold area started with @code{<<#}.
   59:     holdend @ dup holdbuf-end u>= -&11 and throw
   60:     count chars bounds holdptr ! holdend ! ;
   61: 
   62: : sign    ( n -- ) \ core
   63:     \G Used within @code{<#} and @code{#>}. If n (a @var{single} number)
   64:     \G is negative, append the display code for a minus sign to the pictured
   65:     \G numeric output string. Since the string is built up "backwards"
   66:     \G this is usually used immediately prior to @code{#>}, as shown in
   67:     \G the examples below.
   68:     0< IF  [char] - hold  THEN ;
   69: 
   70: : #       ( ud1 -- ud2 ) \ core		number-sign
   71:     \G Used within @code{<#} and @code{#>}. Add the next least-significant
   72:     \G digit to the pictured numeric output string. This is achieved by dividing ud1
   73:     \G by the number in @code{base} to leave quotient ud2 and remainder n; n
   74:     \G is converted to the appropriate display code (eg ASCII code) and appended
   75:     \G to the string. If the number has been fully converted, ud1 will be 0 and
   76:     \G @code{#} will append a "0" to the string.
   77:     base @ ud/mod rot 9 over <
   78:     IF
   79: 	[ char A char 9 - 1- ] Literal +
   80:     THEN
   81:     [char] 0 + hold ;
   82: 
   83: : #s      ( ud -- 0 0 ) \ core	number-sign-s
   84:     \G Used within @code{<#} and @code{#>}. Convert all remaining digits
   85:     \G using the same algorithm as for @code{#}. @code{#s} will convert
   86:     \G at least one digit. Therefore, if ud is 0, @code{#s} will append
   87:     \G a "0" to the pictured numeric output string.
   88:     BEGIN
   89: 	# 2dup or 0=
   90:     UNTIL ;
   91: 
   92: \ print numbers                                        07jun92py
   93: 
   94: : d.r ( d n -- ) \ double	d-dot-r
   95:     \G Display @var{d} right-aligned in a field @var{n} characters wide. If more than
   96:     \G @var{n} characters are needed to display the number, all digits are displayed.
   97:     \G If appropriate, @var{n} must include a character for a leading "-".
   98:     >r tuck  dabs  <<# #s  rot sign #>
   99:     r> over - spaces  type #>> ;
  100: 
  101: : ud.r ( ud n -- ) \ gforth	u-d-dot-r
  102:     \G Display @var{ud} right-aligned in a field @var{n} characters wide. If more than
  103:     \G @var{n} characters are needed to display the number, all digits are displayed.
  104:     >r <<# #s #> r> over - spaces type #>> ;
  105: 
  106: : .r ( n1 n2 -- ) \ core-ext	dot-r
  107:     \G Display @var{n1} right-aligned in a field @var{n2} characters wide. If more than
  108:     \G @var{n2} characters are needed to display the number, all digits are displayed.
  109:     \G If appropriate, @var{n2} must include a character for a leading "-".
  110:     >r s>d r> d.r ;
  111: 
  112: : u.r ( u n -- )  \ core-ext	u-dot-r
  113:     \G Display @var{u} right-aligned in a field @var{n} characters wide. If more than
  114:     \G @var{n} characters are needed to display the number, all digits are displayed.
  115:     0 swap ud.r ;
  116: 
  117: : d. ( d -- ) \ double	d-dot
  118:     \G Display (the signed double number) @var{d} in free-format. followed by a space.
  119:     0 d.r space ;
  120: 
  121: : ud. ( ud -- ) \ gforth	u-d-dot
  122:     \G Display (the signed double number) @var{ud} in free-format, followed by a space.
  123:     0 ud.r space ;
  124: 
  125: : . ( n -- ) \ core	dot
  126:     \G Display (the signed single number) @var{n} in free-format, followed by a space.
  127:     s>d d. ;
  128: 
  129: : u. ( u -- ) \ core	u-dot
  130:     \G Display (the unsigned single number) @var{u} in free-format, followed by a space.
  131:     0 ud. ;
  132: 

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