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08574987d9
* libguile/ports-internal.h (SCM_PORT): Rename from SCM_PTAB_ENTRY. (scm_t_port_internal, SCM_PORT_GET_INTERNAL): Remove. (SCM_FILENAME, SCM_SET_FILENAME, SCM_LINUM, SCM_COL): Adapt. * libguile/ports.c: * libguile/poll.c: * libguile/ioext.c: * libguile/fports.c: * libguile/filesys.c: * libguile/print.c: * libguile/read.c: * libguile/rw.c: * libguile/strings.c: Adapt.
326 lines
8.8 KiB
C
326 lines
8.8 KiB
C
/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2006,
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* 2011, 2014 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include "libguile/_scm.h"
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#include "libguile/dynwind.h"
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#include "libguile/feature.h"
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#include "libguile/fports.h"
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#include "libguile/hashtab.h"
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#include "libguile/ioext.h"
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#include "libguile/ports.h"
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#include "libguile/ports-internal.h"
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#include "libguile/strings.h"
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#include "libguile/validate.h"
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#include <fcntl.h>
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#ifdef HAVE_IO_H
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#include <io.h>
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#endif
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#include <unistd.h>
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SCM_DEFINE (scm_ftell, "ftell", 1, 0, 0,
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(SCM fd_port),
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"Return an integer representing the current position of\n"
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"@var{fd_port}, measured from the beginning. Equivalent to:\n"
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"\n"
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"@lisp\n"
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"(seek port 0 SEEK_CUR)\n"
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"@end lisp")
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#define FUNC_NAME s_scm_ftell
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{
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return scm_seek (fd_port, SCM_INUM0, scm_from_int (SEEK_CUR));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_redirect_port, "redirect-port", 2, 0, 0,
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(SCM old, SCM new),
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"This procedure takes two ports and duplicates the underlying file\n"
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"descriptor from @var{old} into @var{new}. The\n"
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"current file descriptor in @var{new} will be closed.\n"
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"After the redirection the two ports will share a file position\n"
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"and file status flags.\n\n"
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"The return value is unspecified.\n\n"
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"Unexpected behaviour can result if both ports are subsequently used\n"
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"and the original and/or duplicate ports are buffered.\n\n"
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"This procedure does not have any side effects on other ports or\n"
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"revealed counts.")
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#define FUNC_NAME s_scm_redirect_port
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{
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int ans, oldfd, newfd;
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scm_t_fport *fp;
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old = SCM_COERCE_OUTPORT (old);
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new = SCM_COERCE_OUTPORT (new);
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SCM_VALIDATE_OPFPORT (1, old);
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SCM_VALIDATE_OPFPORT (2, new);
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oldfd = SCM_FPORT_FDES (old);
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fp = SCM_FSTREAM (new);
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newfd = fp->fdes;
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if (oldfd != newfd)
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{
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/* Ensure there is nothing in either port's input or output
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buffers. */
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if (SCM_OUTPUT_PORT_P (old))
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scm_flush (old);
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if (SCM_INPUT_PORT_P (old) && SCM_PORT (old)->rw_random)
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scm_end_input (old);
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if (SCM_OUTPUT_PORT_P (new))
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scm_flush (new);
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if (SCM_INPUT_PORT_P (new) && SCM_PORT (new)->rw_random)
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scm_end_input (new);
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ans = dup2 (oldfd, newfd);
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if (ans == -1)
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SCM_SYSERROR;
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SCM_PORT (new)->rw_random = SCM_PORT (old)->rw_random;
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}
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_dup_to_fdes, "dup->fdes", 1, 1, 0,
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(SCM fd_or_port, SCM fd),
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"Return a new integer file descriptor referring to the open file\n"
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"designated by @var{fd_or_port}, which must be either an open\n"
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"file port or a file descriptor.")
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#define FUNC_NAME s_scm_dup_to_fdes
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{
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int oldfd, newfd, rv;
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fd_or_port = SCM_COERCE_OUTPORT (fd_or_port);
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if (scm_is_integer (fd_or_port))
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oldfd = scm_to_int (fd_or_port);
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else
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{
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SCM_VALIDATE_OPFPORT (1, fd_or_port);
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oldfd = SCM_FPORT_FDES (fd_or_port);
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}
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if (SCM_UNBNDP (fd))
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{
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newfd = dup (oldfd);
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if (newfd == -1)
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SCM_SYSERROR;
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fd = scm_from_int (newfd);
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}
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else
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{
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newfd = scm_to_int (fd);
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if (oldfd != newfd)
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{
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scm_evict_ports (newfd); /* see scsh manual. */
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rv = dup2 (oldfd, newfd);
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if (rv == -1)
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SCM_SYSERROR;
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}
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}
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return fd;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_dup2, "dup2", 2, 0, 0,
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(SCM oldfd, SCM newfd),
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"A simple wrapper for the @code{dup2} system call.\n"
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"Copies the file descriptor @var{oldfd} to descriptor\n"
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"number @var{newfd}, replacing the previous meaning\n"
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"of @var{newfd}. Both @var{oldfd} and @var{newfd} must\n"
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"be integers.\n"
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"Unlike for dup->fdes or primitive-move->fdes, no attempt\n"
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"is made to move away ports which are using @var{newfd}.\n"
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"The return value is unspecified.")
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#define FUNC_NAME s_scm_dup2
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{
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int c_oldfd;
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int c_newfd;
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int rv;
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c_oldfd = scm_to_int (oldfd);
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c_newfd = scm_to_int (newfd);
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rv = dup2 (c_oldfd, c_newfd);
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if (rv == -1)
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SCM_SYSERROR;
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_fileno, "fileno", 1, 0, 0,
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(SCM port),
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"Return the integer file descriptor underlying @var{port}. Does\n"
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"not change its revealed count.")
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#define FUNC_NAME s_scm_fileno
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{
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port = SCM_COERCE_OUTPORT (port);
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SCM_VALIDATE_OPFPORT (1, port);
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return scm_from_int (SCM_FPORT_FDES (port));
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}
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#undef FUNC_NAME
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/* GJB:FIXME:: why does this not throw
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an error if the arg is not a port?
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This proc as is would be better names isattyport?
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if it is not going to assume that the arg is a port
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[cmm] I don't see any problem with the above. why should a type
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predicate assume _anything_ about its argument?
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*/
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SCM_DEFINE (scm_isatty_p, "isatty?", 1, 0, 0,
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(SCM port),
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"Return @code{#t} if @var{port} is using a serial non--file\n"
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"device, otherwise @code{#f}.")
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#define FUNC_NAME s_scm_isatty_p
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{
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int rv;
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port = SCM_COERCE_OUTPORT (port);
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if (!SCM_OPFPORTP (port))
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return SCM_BOOL_F;
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rv = isatty (SCM_FPORT_FDES (port));
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return scm_from_bool(rv);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_fdopen, "fdopen", 2, 0, 0,
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(SCM fdes, SCM modes),
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"Return a new port based on the file descriptor @var{fdes}.\n"
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"Modes are given by the string @var{modes}. The revealed count\n"
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"of the port is initialized to zero. The modes string is the\n"
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"same as that accepted by @ref{File Ports, open-file}.")
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#define FUNC_NAME s_scm_fdopen
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{
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return scm_i_fdes_to_port (scm_to_int (fdes),
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scm_i_mode_bits (modes), SCM_BOOL_F);
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}
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#undef FUNC_NAME
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/* Move a port's underlying file descriptor to a given value.
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* Returns #f if fdes is already the given value.
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* #t if fdes moved.
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* MOVE->FDES is implemented in Scheme and calls this primitive.
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*/
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SCM_DEFINE (scm_primitive_move_to_fdes, "primitive-move->fdes", 2, 0, 0,
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(SCM port, SCM fd),
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"Moves the underlying file descriptor for @var{port} to the integer\n"
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"value @var{fd} without changing the revealed count of @var{port}.\n"
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"Any other ports already using this descriptor will be automatically\n"
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"shifted to new descriptors and their revealed counts reset to zero.\n"
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"The return value is @code{#f} if the file descriptor already had the\n"
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"required value or @code{#t} if it was moved.")
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#define FUNC_NAME s_scm_primitive_move_to_fdes
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{
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scm_t_fport *stream;
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int old_fd;
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int new_fd;
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int rv;
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port = SCM_COERCE_OUTPORT (port);
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SCM_VALIDATE_OPFPORT (1, port);
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stream = SCM_FSTREAM (port);
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old_fd = stream->fdes;
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new_fd = scm_to_int (fd);
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if (old_fd == new_fd)
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{
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return SCM_BOOL_F;
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}
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scm_evict_ports (new_fd);
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rv = dup2 (old_fd, new_fd);
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if (rv == -1)
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SCM_SYSERROR;
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stream->fdes = new_fd;
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SCM_SYSCALL (close (old_fd));
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return SCM_BOOL_T;
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}
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#undef FUNC_NAME
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static SCM
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get_matching_port (void *closure, SCM port, SCM result)
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{
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int fd = * (int *) closure;
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if (SCM_OPFPORTP (port) && SCM_FSTREAM (port)->fdes == fd)
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result = scm_cons (port, result);
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return result;
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}
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/* Return a list of ports using a given file descriptor. */
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SCM_DEFINE (scm_fdes_to_ports, "fdes->ports", 1, 0, 0,
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(SCM fd),
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"Return a list of existing ports which have @var{fd} as an\n"
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"underlying file descriptor, without changing their revealed\n"
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"counts.")
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#define FUNC_NAME s_scm_fdes_to_ports
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{
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SCM result = SCM_EOL;
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int int_fd = scm_to_int (fd);
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result = scm_c_weak_set_fold (get_matching_port,
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(void*) &int_fd, result,
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scm_i_port_weak_set);
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return result;
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}
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#undef FUNC_NAME
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static void
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scm_init_ice_9_ioext (void)
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{
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#include "libguile/ioext.x"
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}
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void
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scm_init_ioext ()
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{
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scm_add_feature ("i/o-extensions");
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scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
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"scm_init_ice_9_ioext",
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(scm_t_extension_init_func) scm_init_ice_9_ioext,
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NULL);
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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