Annotation of gforth/stuff.fs, revision 1.26
1.1 anton 1: \ miscelleneous words
2:
1.15 anton 3: \ Copyright (C) 1996,1997,1998,2000 Free Software Foundation, Inc.
1.1 anton 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
1.16 anton 19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1 anton 20:
1.17 anton 21: require glocals.fs
1.8 anton 22:
1.6 anton 23: ' require alias needs ( ... "name" -- ... ) \ gforth
1.11 crook 24: \G An alias for @code{require}; exists on other systems (e.g., Win32Forth).
1.1 anton 25: \ needs is an F-PC name. we will probably switch to 'needs' in the future
26:
27: \ a little more compiler security
28:
29: \ currently not used by Gforth, but maybe by add-ons e.g., the 486asm
30: AUser CSP
31:
32: : !CSP ( -- )
33: sp@ csp ! ;
34:
35: : ?CSP ( -- )
36: sp@ csp @ <> -22 and throw ;
1.2 anton 37:
1.4 anton 38: \ DMIN and DMAX
39:
1.13 crook 40: : dmin ( d1 d2 -- d ) \ double d-min
1.5 pazsan 41: 2over 2over d> IF 2swap THEN 2drop ;
1.2 anton 42:
1.13 crook 43:
44: : dmax ( d1 d2 -- d ) \ double d-max
1.5 pazsan 45: 2over 2over d< IF 2swap THEN 2drop ;
1.4 anton 46:
47: \ shell commands
48:
1.10 crook 49: 0 Value $? ( -- n ) \ gforth dollar-question
1.12 crook 50: \G @code{Value} -- the exit status returned by the most recently executed
1.9 crook 51: \G @code{system} command.
1.4 anton 52:
1.14 anton 53: : system ( c-addr u -- ) \ gforth
54: \G Pass the string specified by @var{c-addr u} to the host operating system
1.9 crook 55: \G for execution in a sub-shell.
1.4 anton 56: (system) throw TO $? ;
1.9 crook 57:
1.4 anton 58: : sh ( "..." -- ) \ gforth
1.9 crook 59: \G Parse a string and use @code{system} to pass it to the host
60: \G operating system for execution in a sub-shell.
1.4 anton 61: '# parse cr system ;
62:
1.8 anton 63: \ stuff
64:
1.10 crook 65: : ]L ( compilation: n -- ; run-time: -- n ) \ gforth
66: \G equivalent to @code{] literal}
1.8 anton 67: ] postpone literal ;
68:
1.23 anton 69: [ifundef] in-dictionary?
1.8 anton 70: : in-dictionary? ( x -- f )
71: forthstart dictionary-end within ;
1.23 anton 72: [endif]
1.8 anton 73:
74: : in-return-stack? ( addr -- f )
75: rp0 @ swap - [ forthstart 6 cells + ]L @ u< ;
1.17 anton 76:
77: \ const-does>
78:
79: : compile-literals ( w*u u -- ; run-time: -- w*u ) recursive
1.18 anton 80: \ compile u literals, starting with the bottommost one
1.17 anton 81: ?dup-if
82: swap >r 1- compile-literals
83: r> POSTPONE literal
84: endif ;
85:
86: : compile-fliterals ( r*u u -- ; run-time: -- w*u ) recursive
1.18 anton 87: \ compile u fliterals, starting with the bottommost one
1.17 anton 88: ?dup-if
89: { F: r } 1- compile-fliterals
90: r POSTPONE fliteral
91: endif ;
92:
93: : (const-does>) ( w*uw r*ur uw ur target "name" -- )
1.18 anton 94: \ define a colon definition "name" containing w*uw r*ur as
95: \ literals and a call to target.
1.17 anton 96: { uw ur target }
97: header docol: cfa, \ start colon def without stack junk
98: ur compile-fliterals uw compile-literals
99: target compile, POSTPONE exit reveal ;
100:
101: : const-does> ( run-time: w*uw r*ur uw ur "name" -- )
1.18 anton 102: \G Defines @var{name} and returns.@sp 0
103: \G @var{name} execution: pushes @var{w*uw r*ur}, then performs the
104: \G code following the @code{const-does>}.
1.17 anton 105: here >r 0 POSTPONE literal
106: POSTPONE (const-does>)
107: POSTPONE ;
108: noname : POSTPONE rdrop
109: lastxt r> cell+ ! \ patch the literal
110: ; immediate
1.19 anton 111:
1.20 anton 112: \ !! rewrite slurp-file using slurp-fid
1.19 anton 113: : slurp-file ( c-addr1 u1 -- c-addr2 u2 )
1.20 anton 114: \G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents
1.19 anton 115: r/o bin open-file throw >r
116: r@ file-size throw abort" file too large"
117: dup allocate throw swap
118: 2dup r@ read-file throw over <> abort" could not read whole file"
119: r> close-file throw ;
120:
1.20 anton 121: : slurp-fid { fid -- addr u }
122: \G @var{addr u} is the content of the file @var{fid}
123: 0 0 begin ( awhole uwhole )
124: dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew )
125: rot r@ fid read-file throw ( awhole uwhole uread R: unew )
126: r> 2dup =
127: while ( awhole uwhole uread unew )
128: 2drop
129: repeat
130: - + dup >r resize throw r> ;
1.24 anton 131:
1.25 anton 132: \ ]] ... [[
133:
134: : compile-literal ( n -- )
135: postpone literal ;
136:
137: : [[ ( -- )
138: \G switch from postpone state to compile state
139: \ this is only a marker; it is never really interpreted
140: compile-only-error ; immediate
141:
142: : postponer ( c-addr u -- )
143: 2dup find-name dup if ( c-addr u nt )
144: nip nip name>comp
145: 2dup [comp'] [[ d= if
146: 2drop ['] compiler is parser
147: else
148: postpone,
149: endif
150: else
151: drop
152: 2dup snumber? dup if
153: 0> IF
154: swap postpone literal postpone compile-literal
155: THEN
156: postpone Literal postpone compile-literal
157: 2drop
158: ELSE
159: drop no.extensions
160: THEN
161: then ;
162:
163: : ]] ( -- )
164: \ switch into postpone state
165: ['] postponer is parser state on ; immediate restrict
166:
1.26 ! anton 167: \ f.rdp
! 168:
! 169: : move-right ( c-addr u1 u2 cfill -- )
! 170: \ move string at c-addr u1 right by u2 chars (without exceeding
! 171: \ the original bound); fill the gap with cfill
! 172: >r dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr )
! 173: dup 2swap /string cmove>
! 174: r> r> r> fill ;
! 175:
! 176: : f>buf-rdp { f: rf c-addr ur nd up -- } \ gforth
! 177: \G Convert @i{rf} into a string at @i{c-addr ur}. The conversion
! 178: \G rules and the meanings of @i{ur nd up} are the same as for
! 179: \G @code{f.rdp}.
! 180: rf c-addr ur represent if { nexp fsign }
! 181: nd nexp + up >=
! 182: ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if
! 183: \ fixed-point notation
! 184: c-addr ur beforep nexp - dup { befored } '0 move-right
! 185: c-addr beforep 1- befored min dup { beforez } 0 max bl fill
! 186: fsign if
! 187: '- c-addr beforez 1- 0 max + c!
! 188: endif
! 189: c-addr ur beforep /string 1 '. move-right
! 190: else \ exponential notation
! 191: c-addr ur 1 /string 1 '. move-right
! 192: fsign if
! 193: c-addr ur 1 '- move-right
! 194: endif
! 195: nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen }
! 196: explen 1+ fsign - ur > if \ exponent too large
! 197: drop c-addr ur '* fill
! 198: else
! 199: c-addr ur + 0 explen negate /string move
! 200: endif
! 201: #>>
! 202: endif
! 203: else \ inf or nan
! 204: if \ negative
! 205: c-addr ur 1 '- move-right
! 206: endif
! 207: drop
! 208: \ !! align in some way?
! 209: endif ;
! 210:
! 211: : f>str-rdp ( rf ur +nd up -- c-addr ur ) \ gforth
! 212: \G Convert @i{rf} into a string at @i{c-addr ur}. The conversion
! 213: \G rules and the meanings of @i{ur +nd up} are the same as for
! 214: \G @code{f.rdp}. The result in in the pictured numeric output buffer
! 215: \G and will be destroyed by anything destroying that buffer.
! 216: rot holdptr @ 1- 0 rot negate /string ( rf +nd up c-addr ur )
! 217: over holdbuf u< -&17 and throw
! 218: 2tuck 2>r f>buf-rdp 2r> ;
! 219:
! 220: : f.rdp ( rf ur +nd up -- ) \ gforth
! 221: \G Print float @i{rf} formatted. The total width of the output is
! 222: \G @i{nr}, the number of digits after the decimal point is @i{+nd},
! 223: \G the minimum number of significant digits for fixed-point notation
! 224: \G is @i{up}. @code{Set-precision} has no effect on @code{f.rdp}.
! 225: \G Fixed-point notation is used if the number of siginicant digits
! 226: \G would be larger than @i{up} and if the number of digits before the
! 227: \G decimal point would fit. If fixed-point notation is not used,
! 228: \G exponential notation is used, and if that does not fit, asterisks
! 229: \G are printed. We recommend using @i{ur}>=7 to avoid the risk of
! 230: \G numbers not fitting at all. We recommend @i{ur}>=@i{up}+5 to avoid
! 231: \G cases where @code{f.rdp} switches to exponential notation because
! 232: \G fixed-point notation would have too few significant digits, yet
! 233: \G exponential notation offers fewer significant digits. We recomment
! 234: \G @i{ur}>=@i{nd}+2, if you want to have fixed-point notation for some
! 235: \G numbers. Currently, trailing digits are cut off.
! 236: f>str-rdp type ;
! 237:
! 238: 0 [if]
! 239: : testx ( rf ur nd up -- )
! 240: '| emit f.rdp ;
! 241:
! 242: : test ( -- )
! 243: -0.123456789123456789e-20
! 244: 40 0 ?do
! 245: cr
! 246: fdup 7 3 1 testx
! 247: fdup 7 3 4 testx
! 248: fdup 7 3 0 testx
! 249: fdup 7 7 1 testx
! 250: fdup 7 5 1 testx
! 251: fdup 7 0 2 testx
! 252: fdup 5 2 1 testx
! 253: fdup 4 2 1 testx
! 254: fdup 18 8 5 testx
! 255: '| emit
! 256: 10e f*
! 257: loop ;
! 258: [then]
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