/* Copyright (C) 1995,1996,1998,1999,2000,2001 Free Software Foundation, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program 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 the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this software; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307 USA * * As a special exception, the Free Software Foundation gives permission * for additional uses of the text contained in its release of GUILE. * * The exception is that, if you link the GUILE library with other files * to produce an executable, this does not by itself cause the * resulting executable to be covered by the GNU General Public License. * Your use of that executable is in no way restricted on account of * linking the GUILE library code into it. * * This exception does not however invalidate any other reasons why * the executable file might be covered by the GNU General Public License. * * This exception applies only to the code released by the * Free Software Foundation under the name GUILE. If you copy * code from other Free Software Foundation releases into a copy of * GUILE, as the General Public License permits, the exception does * not apply to the code that you add in this way. To avoid misleading * anyone as to the status of such modified files, you must delete * this exception notice from them. * * If you write modifications of your own for GUILE, it is your choice * whether to permit this exception to apply to your modifications. * If you do not wish that, delete this exception notice. */ #include #include #include "libguile/_scm.h" #include "libguile/eval.h" #include "libguile/chars.h" #include "libguile/fports.h" #include "libguile/root.h" #include "libguile/strings.h" #include "libguile/vectors.h" #include "libguile/validate.h" #include "libguile/vports.h" #ifdef HAVE_STRING_H #include #endif /* {Ports - soft ports} * */ static scm_t_bits scm_tc16_sfport; static void sf_flush (SCM port) { scm_t_port *pt = SCM_PTAB_ENTRY (port); SCM stream = SCM_PACK (pt->stream); if (pt->write_pos > pt->write_buf) { /* write the byte. */ scm_call_1 (SCM_VELTS (stream)[0], SCM_MAKE_CHAR (*pt->write_buf)); pt->write_pos = pt->write_buf; /* flush the output. */ { SCM f = SCM_VELTS (stream)[2]; if (!SCM_FALSEP (f)) scm_call_0 (f); } } } static void sf_write (SCM port, const void *data, size_t size) { SCM p = SCM_PACK (SCM_STREAM (port)); scm_call_1 (SCM_VELTS (p)[1], scm_mem2string ((char *) data, size)); } /* calling the flush proc (element 2) is in case old code needs it, but perhaps softports could the use port buffer in the same way as fports. */ /* places a single char in the input buffer. */ static int sf_fill_input (SCM port) { SCM p = SCM_PACK (SCM_STREAM (port)); SCM ans; ans = scm_call_0 (SCM_VELTS (p)[3]); /* get char. */ if (SCM_FALSEP (ans) || SCM_EOF_OBJECT_P (ans)) return EOF; SCM_ASSERT (SCM_CHARP (ans), ans, SCM_ARG1, "sf_fill_input"); { scm_t_port *pt = SCM_PTAB_ENTRY (port); *pt->read_buf = SCM_CHAR (ans); pt->read_pos = pt->read_buf; pt->read_end = pt->read_buf + 1; return *pt->read_buf; } } static int sf_close (SCM port) { SCM p = SCM_PACK (SCM_STREAM (port)); SCM f = SCM_VELTS (p)[4]; if (SCM_FALSEP (f)) return 0; f = scm_call_0 (f); errno = 0; return SCM_FALSEP (f) ? EOF : 0; } SCM_DEFINE (scm_make_soft_port, "make-soft-port", 2, 0, 0, (SCM pv, SCM modes), "Return a port capable of receiving or delivering characters as\n" "specified by the @var{modes} string (@pxref{File Ports,\n" "open-file}). @var{pv} must be a vector of length 5. Its\n" "components are as follows:\n" "\n" "@enumerate 0\n" "@item\n" "procedure accepting one character for output\n" "@item\n" "procedure accepting a string for output\n" "@item\n" "thunk for flushing output\n" "@item\n" "thunk for getting one character\n" "@item\n" "thunk for closing port (not by garbage collection)\n" "@end enumerate\n" "\n" "For an output-only port only elements 0, 1, 2, and 4 need be\n" "procedures. For an input-only port only elements 3 and 4 need\n" "be procedures. Thunks 2 and 4 can instead be @code{#f} if\n" "there is no useful operation for them to perform.\n" "\n" "If thunk 3 returns @code{#f} or an @code{eof-object}\n" "(@pxref{Input, eof-object?, ,r5rs, The Revised^5 Report on\n" "Scheme}) it indicates that the port has reached end-of-file.\n" "For example:\n" "\n" "@lisp\n" "(define stdout (current-output-port))\n" "(define p (make-soft-port\n" " (vector\n" " (lambda (c) (write c stdout))\n" " (lambda (s) (display s stdout))\n" " (lambda () (display \".\" stdout))\n" " (lambda () (char-upcase (read-char)))\n" " (lambda () (display \"@@\" stdout)))\n" " \"rw\"))\n" "\n" "(write p p) @result{} #\n" "@end lisp") #define FUNC_NAME s_scm_make_soft_port { scm_t_port *pt; SCM z; SCM_VALIDATE_VECTOR_LEN (1,pv,5); SCM_VALIDATE_STRING (2, modes); SCM_STRING_COERCE_0TERMINATION_X (modes); SCM_NEWCELL (z); SCM_DEFER_INTS; pt = scm_add_to_port_table (z); scm_port_non_buffer (pt); SCM_SET_CELL_TYPE (z, scm_tc16_sfport | scm_mode_bits (SCM_STRING_CHARS (modes))); SCM_SETPTAB_ENTRY (z, pt); SCM_SETSTREAM (z, SCM_UNPACK (pv)); SCM_ALLOW_INTS; return z; } #undef FUNC_NAME static scm_t_bits scm_make_sfptob () { scm_t_bits tc = scm_make_port_type ("soft", sf_fill_input, sf_write); scm_set_port_mark (tc, scm_markstream); scm_set_port_flush (tc, sf_flush); scm_set_port_close (tc, sf_close); return tc; } void scm_init_vports () { scm_tc16_sfport = scm_make_sfptob (); #include "libguile/vports.x" } /* Local Variables: c-file-style: "gnu" End: */