in.sa


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-- Copyright (C) 1994 by International Computer Science Institute            --
-- This file is part of the GNU Sather library. It is free software; you may --
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-- Public  License (LGPL)  as published  by the  Free  Software  Foundation; --
-- either version 2 of the license, or (at your option) any later version.   --
-- This  library  is distributed  in the  hope that it will  be  useful, but --
-- WITHOUT ANY WARRANTY without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See Doc/LGPL for more details.       --
-- The license text is also available from:  Free Software Foundation, Inc., --
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-------------->  Please email comments to <bug-sather@gnu.org>  <--------------

-- in.sa: Input from stdin.


class IN

class IN is -- Direct access to stdin. create:SAME is return self end; get_char:INT is -- Retrieve a single character as an INT from stdin, negative for -- end of file. Built-in. builtin IN_GETCHAR; end; get_str:STR is -- A string containing the characters on stdin up to the next -- newline. return get_line.str; end; get_line:FSTR is -- A string buffer containing the characters on stdin up to the -- next newline. return append_line(void); end; private const size : INT := 256; append_line(s:FSTR):FSTR is -- Retrieve a string from stdin up to the next newline and append -- it to `s'. -- Implementation contributed by hikichi@srarc2.sra.co.jp -- (Nobuyuki Hikichi). bsize ::= size; loop buf ::= #FSTR(bsize); -- buffer to hold C string buf.loc := bsize - 1; get_str_sized(buf, bsize); m: INT := buf.index_of('\n'); if m >= 0 then buf.loc := m; return s + buf; end; n: INT := buf.index_of('\0'); if n = -1 then s := s + buf; bsize := bsize * 2; elsif n = 0 then return s; elsif n <= (bsize - 1) then buf.loc := n; return s + buf; else raise "IN::append_line, out of range [-1, bsize-1]"; end; -- if end; -- loop end; -- fstr (s:FSTR) private get_str_sized(buf:FSTR,sz:INT) is -- Read at most sz-1 characters and place them in buf, -- followed by trailing '\0'. Built-in. builtin IN_GET_STR_SIZED; end; error:BOOL is -- true if an error has been encountered. Cleared by "clear". return RUNTIME::ferror(FILE::stdin_macro); end; eof:BOOL is -- true if EOF has been encountered. Cleared by "clear". return RUNTIME::feof(FILE::stdin_macro); end; clear is -- resets end_seen and error status RUNTIME::clearerr(FILE::stdin_macro); end; end; -- class IN