File:  [gforth] / gforth / kernel / nio.fs
Revision 1.25: download - view: text, annotated - select for diffs
Fri Dec 31 18:09:02 2010 UTC (11 years, 6 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright years

    1: \ Number IO
    2: 
    3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2006,2007,2010 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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: require ./io.fs
   21: 
   22: : pad    ( -- c-addr ) \ core-ext
   23:     \G @var{c-addr} is the address of a transient region that can be
   24:     \G used as temporary data storage. At least 84 characters of space
   25:     \G is available.
   26:     [ has? flash [IF] ] normal-dp @ [ [ELSE] ] here [ [THEN] ]
   27:     word-pno-size + aligned ;
   28: 
   29: \ hold <# #> sign # #s                                 25jan92py
   30: 
   31: has? EC [IF]
   32:     : hld  ( -- addr )  pad cell - ;
   33:     : hold  ( char -- )  hld -1 over +! @ c! ;
   34:     : <#    hld dup ! ;
   35:     : #>   ( d -- addr +n )  2drop hld dup @ tuck - ;
   36:     ' <# alias <<#
   37:     ' noop alias #>>
   38: [ELSE]
   39: : hold    ( char -- ) \ core
   40:     \G Used within @code{<#} and @code{#>}. Append the character
   41:     \G @var{char} to the pictured numeric output string.
   42:     -1 chars holdptr +!
   43:     holdptr @ dup holdbuf u< -&17 and throw
   44:     c! ;
   45: 
   46: : <# ( -- ) \ core	less-number-sign
   47:     \G Initialise/clear the pictured numeric output string.
   48:     holdbuf-end dup holdptr ! holdend ! ;
   49: 
   50: : #>      ( xd -- addr u ) \ core	number-sign-greater
   51:     \G Complete the pictured numeric output string by discarding
   52:     \G @var{xd} and returning @var{addr u}; the address and length of
   53:     \G the formatted string. A Standard program may modify characters
   54:     \G within the string.
   55:     2drop holdptr @ holdend @ over - ;
   56: 
   57: : <<# ( -- ) \ gforth	less-less-number-sign
   58:     \G Start a hold area that ends with @code{#>>}. Can be nested in
   59:     \G each other and in @code{<#}.  Note: if you do not match up the
   60:     \G @code{<<#}s with @code{#>>}s, you will eventually run out of
   61:     \G hold area; you can reset the hold area to empty with @code{<#}.
   62:     holdend @ holdptr @ - hold
   63:     holdptr @ holdend ! ;
   64: 
   65: : #>> ( -- ) \ gforth	number-sign-greater-greater
   66:     \G Release the hold area started with @code{<<#}.
   67:     holdend @ dup holdbuf-end u>= -&11 and throw
   68:     count chars bounds holdptr ! holdend ! ;
   69: [THEN]
   70: 
   71: : sign    ( n -- ) \ core
   72:     \G Used within @code{<#} and @code{#>}. If @var{n} (a @var{single}
   73:     \G number) is negative, append the display code for a minus sign
   74:     \G to the pictured numeric output string. Since the string is
   75:     \G built up ``backwards'' this is usually used immediately prior
   76:     \G to @code{#>}, as shown in the examples below.
   77:     0< IF  [char] - hold  THEN ;
   78: 
   79: : #       ( ud1 -- ud2 ) \ core		number-sign
   80:     \G Used within @code{<#} and @code{#>}. Add the next
   81:     \G least-significant digit to the pictured numeric output
   82:     \G string. This is achieved by dividing @var{ud1} by the number in
   83:     \G @code{base} to leave quotient @var{ud2} and remainder @var{n};
   84:     \G @var{n} is converted to the appropriate display code (eg ASCII
   85:     \G code) and appended to the string. If the number has been fully
   86:     \G converted, @var{ud1} will be 0 and @code{#} will append a ``0''
   87:     \G to the string.
   88:     base @ ud/mod rot 9 over <
   89:     IF
   90: 	[ char A char 9 - 1- ] Literal +
   91:     THEN
   92:     [char] 0 + hold ;
   93: 
   94: : #s      ( ud -- 0 0 ) \ core	number-sign-s
   95:     \G Used within @code{<#} and @code{#>}. Convert all remaining digits
   96:     \G using the same algorithm as for @code{#}. @code{#s} will convert
   97:     \G at least one digit. Therefore, if @var{ud} is 0, @code{#s} will append
   98:     \G a ``0'' to the pictured numeric output string.
   99:     BEGIN
  100: 	# 2dup or 0=
  101:     UNTIL ;
  102: 
  103: : holds ( addr u -- )
  104:     BEGIN  dup  WHILE  1- 2dup + c@ hold  REPEAT  2drop ;
  105: 
  106: \ print numbers                                        07jun92py
  107: 
  108: : d.r ( d n -- ) \ double	d-dot-r
  109:     \G Display @var{d} right-aligned in a field @var{n} characters wide. If more than
  110:     \G @var{n} characters are needed to display the number, all digits are displayed.
  111:     \G If appropriate, @var{n} must include a character for a leading ``-''.
  112:     >r tuck  dabs  <<# #s  rot sign #>
  113:     r> over - spaces  type #>> ;
  114: 
  115: : ud.r ( ud n -- ) \ gforth	u-d-dot-r
  116:     \G Display @var{ud} right-aligned in a field @var{n} characters wide. If more than
  117:     \G @var{n} characters are needed to display the number, all digits are displayed.
  118:     >r <<# #s #> r> over - spaces type #>> ;
  119: 
  120: : .r ( n1 n2 -- ) \ core-ext	dot-r
  121:     \G Display @var{n1} right-aligned in a field @var{n2} characters wide. If more than
  122:     \G @var{n2} characters are needed to display the number, all digits are displayed.
  123:     \G If appropriate, @var{n2} must include a character for a leading ``-''.
  124:     >r s>d r> d.r ;
  125: 
  126: : u.r ( u n -- )  \ core-ext	u-dot-r
  127:     \G Display @var{u} right-aligned in a field @var{n} characters wide. If more than
  128:     \G @var{n} characters are needed to display the number, all digits are displayed.
  129:     0 swap ud.r ;
  130: 
  131: : d. ( d -- ) \ double	d-dot
  132:     \G Display (the signed double number) @var{d} in free-format. followed by a space.
  133:     0 d.r space ;
  134: 
  135: : ud. ( ud -- ) \ gforth	u-d-dot
  136:     \G Display (the signed double number) @var{ud} in free-format, followed by a space.
  137:     0 ud.r space ;
  138: 
  139: : . ( n -- ) \ core	dot
  140:     \G Display (the signed single number) @var{n} in free-format, followed by a space.
  141:     s>d d. ;
  142: 
  143: : u. ( u -- ) \ core	u-dot
  144:     \G Display (the unsigned single number) @var{u} in free-format, followed by a space.
  145:     0 ud. ;
  146: 

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