X-Git-Url: http://git.hcoop.net/bpt/guile.git/blobdiff_plain/ee149d0368eea641c5d05c6cafc888a3cd76ea5e..8571dbde639e0ee9885bad49c9e180474bd23646:/libguile/ioext.c diff --git a/libguile/ioext.c b/libguile/ioext.c dissimilarity index 88% index 54edd547a..089ef1a01 100644 --- a/libguile/ioext.c +++ b/libguile/ioext.c @@ -1,634 +1,318 @@ -/* Copyright (C) 1995, 1996, 1997, 1998 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 "_scm.h" -#include "ports.h" -#include "read.h" -#include "fports.h" -#include "unif.h" -#include "chars.h" - -#include "ioext.h" - -#include - -#ifdef HAVE_STRING_H -#include -#endif -#ifdef HAVE_UNISTD_H -#include -#endif - - -SCM_PROC (s_read_delimited_x, "%read-delimited!", 3, 3, 0, scm_read_delimited_x); - -SCM -scm_read_delimited_x (delims, buf, gobble, port, start, end) - SCM delims; - SCM buf; - SCM gobble; - SCM port; - SCM start; - SCM end; -{ - long j; - char *cbuf; - long cstart; - long cend; - int c; - char *cdelims; - int num_delims; - - SCM_ASSERT (SCM_NIMP (delims) && SCM_ROSTRINGP (delims), - delims, SCM_ARG1, s_read_delimited_x); - cdelims = SCM_ROCHARS (delims); - num_delims = SCM_ROLENGTH (delims); - SCM_ASSERT (SCM_NIMP (buf) && SCM_STRINGP (buf), - buf, SCM_ARG2, s_read_delimited_x); - cbuf = SCM_CHARS (buf); - cend = SCM_LENGTH (buf); - if (SCM_UNBNDP (port)) - port = scm_cur_inp; - else - { - SCM_ASSERT (SCM_NIMP (port) && SCM_OPINPORTP (port), - port, SCM_ARG1, s_read_delimited_x); - } - - if (SCM_UNBNDP (start)) - cstart = 0; - else - { - cstart = scm_num2long (start, - (char *) SCM_ARG5, s_read_delimited_x); - if (cstart < 0 || cstart >= cend) - scm_out_of_range (s_read_delimited_x, start); - - if (!SCM_UNBNDP (end)) - { - long tend = scm_num2long (end, (char *) SCM_ARG6, - s_read_delimited_x); - if (tend <= cstart || tend > cend) - scm_out_of_range (s_read_delimited_x, end); - cend = tend; - } - } - - for (j = cstart; j < cend; j++) - { - int k; - - c = scm_getc (port); - for (k = 0; k < num_delims; k++) - { - if (cdelims[k] == c) - { - if (SCM_FALSEP (gobble)) - scm_ungetc (c, port); - - return scm_cons (SCM_MAKICHR (c), - scm_long2num (j - cstart)); - } - } - if (c == EOF) - return scm_cons (SCM_EOF_VAL, - scm_long2num (j - cstart)); - - cbuf[j] = c; - } - return scm_cons (SCM_BOOL_F, scm_long2num (j - cstart)); -} - -static unsigned char * -scm_do_read_line (SCM port, int *len_p) -{ - struct scm_port_table *pt = SCM_PTAB_ENTRY (port); - unsigned char *end; - - /* I thought reading lines was simple. Mercy me. */ - - /* If there are any pushed-back characters, read the line character - by character. */ - if (SCM_CRDYP (port)) - { - int buf_size = 60; - /* Invariant: buf always has buf_size + 1 characters allocated; - the `+ 1' is for the final '\0'. */ - unsigned char *buf = malloc (buf_size + 1); - int buf_len = 0; - int c; - - while ((c = scm_getc (port)) != EOF) - { - if (buf_len >= buf_size) - { - buf = realloc (buf, buf_size * 2 + 1); - buf_size *= 2; - } - - buf[buf_len++] = c; - - if (c == '\n') - break; - } - - /* Since SCM_CRDYP returned true, we ought to have gotten at - least one character. */ - if (buf_len == 0) - abort (); - - buf[buf_len] = '\0'; - - *len_p = buf_len; - return buf; - } - - /* The common case: no unread characters, and the buffer contains - a complete line. This needs to be fast. */ - if ((end = memchr (pt->read_pos, '\n', (pt->read_end - pt->read_pos))) - != 0) - { - int buf_len = (end + 1) - pt->read_pos; - /* Allocate a buffer of the perfect size. */ - unsigned char *buf = malloc (buf_len + 1); - - memcpy (buf, pt->read_pos, buf_len); - pt->read_pos += buf_len; - - buf[buf_len] = '\0'; - - *len_p = buf_len; - return buf; - } - - /* There are no unread characters, and the buffer contains no newlines. */ - { - /* When live, len is always the number of characters in the - current buffer that are part of the current line. */ - int len = (pt->read_end - pt->read_pos); - int buf_size = (len < 50) ? 60 : len * 2; - /* Invariant: buf always has buf_size + 1 characters allocated; - the `+ 1' is for the final '\0'. */ - unsigned char *buf = malloc (buf_size + 1); - int buf_len = 0; - int c; - - for (;;) - { - if (buf_len + len > buf_size) - { - int new_size = (buf_len + len) * 2; - buf = realloc (buf, new_size + 1); - buf_size = new_size; - } - - /* Copy what we've got out of the port, into our buffer. */ - memcpy (buf + buf_len, pt->read_pos, len); - buf_len += len; - pt->read_pos += len; - - /* If we had seen a newline, we're done now. */ - if (end) - break; - - /* Get more characters. I think having fill_buffer return a - character is not terribly graceful... */ - c = (scm_ptobs[SCM_PTOBNUM (port)].fill_buffer) (port); - if (c == EOF) - { - /* If we're missing a final newline in the file, return - what we did get, sans newline. */ - if (buf_len > 0) - break; - - free (buf); - return 0; - } - - /* ... because it makes us duplicate code here... */ - if (buf_len + 1 > buf_size) - { - int new_size = buf_size * 2; - buf = realloc (buf, new_size + 1); - buf_size = new_size; - } - - /* ... and this is really a duplication of the memcpy and - memchr calls, on a single-byte buffer. */ - buf[buf_len++] = c; - if (c == '\n') - break; - - /* Search the buffer for newlines. */ - if ((end = memchr (pt->read_pos, '\n', - (len = (pt->read_end - pt->read_pos)))) - != 0) - len = (end - pt->read_pos) + 1; - } - - /* I wonder how expensive this realloc is. */ - buf = realloc (buf, buf_len + 1); - buf[buf_len] = '\0'; - *len_p = buf_len; - return buf; - } -} - - -/* - * %read-line - * truncates any terminating newline from its input, and returns - * a cons of the string read and its terminating character. Doing - * so makes it easy to implement the hairy `read-line' options - * efficiently in Scheme. - */ - -SCM_PROC (s_read_line, "%read-line", 0, 1, 0, scm_read_line); - -SCM -scm_read_line (port) - SCM port; -{ - char *s; - int slen; - SCM line, term; - - if (SCM_UNBNDP (port)) - port = scm_cur_inp; - else - { - SCM_ASSERT (SCM_NIMP (port) && SCM_OPINPORTP (port), - port, SCM_ARG1, s_read_line); - } - - s = scm_do_read_line (port, &slen); - - if (s == NULL) - term = line = SCM_EOF_VAL; - else - { - if (s[slen-1] == '\n') - { - term = SCM_MAKICHR ('\n'); - s[slen-1] = '\0'; - line = scm_take_str (s, slen-1); - SCM_INCLINE (port); - } - else - { - /* Fix: we should check for eof on the port before assuming this. */ - term = SCM_EOF_VAL; - line = scm_take_str (s, slen); - } - } - - return scm_cons (line, term); -} - -SCM_PROC (s_write_line, "write-line", 1, 1, 0, scm_write_line); - -SCM -scm_write_line (obj, port) - SCM obj; - SCM port; -{ - scm_display (obj, port); - return scm_newline (port); -} - -SCM_PROC (s_ftell, "ftell", 1, 0, 0, scm_ftell); - -SCM -scm_ftell (object) - SCM object; -{ - if (SCM_INUMP (object)) - { - int fdes = SCM_INUM (object); - fpos_t pos; - - pos = lseek (fdes, 0, SEEK_CUR); - if (pos == -1) - scm_syserror (s_ftell); - return scm_long2num (pos); - } - else - { - struct scm_fport *fp; - struct scm_port_table *pt; - int fdes; - fpos_t pos; - - object = SCM_COERCE_OUTPORT (object); - SCM_ASSERT (SCM_NIMP (object) && SCM_OPFPORTP (object), - object, SCM_ARG1, s_ftell); - fp = SCM_FSTREAM (object); - pt = SCM_PTAB_ENTRY (object); - fdes = fp->fdes; - pos = lseek (fdes, 0, SEEK_CUR); - if (pos == -1) - scm_syserror (s_ftell); - /* the seek will only have succeeded if fdes is random access, - in which case only one buffer can be filled. */ - if (pt->write_pos > pt->write_buf) - { - pos += pt->write_pos - pt->write_buf; - } - else - { - pos -= pt->read_end - pt->read_pos; - if (SCM_CRDYP (object)) - pos -= SCM_N_READY_CHARS (object); - } - return scm_long2num (pos); - } -} - -/* clear the three buffers in a port. */ -#define SCM_CLEAR_BUFFERS(port, pt)\ -{\ - if (pt->write_pos > pt->write_buf)\ - scm_fflush (port);\ - pt->read_pos = pt->read_end = pt->read_buf;\ - pt->write_needs_seek = 0;\ - SCM_CLRDY (port);\ -} - -SCM_PROC (s_fseek, "fseek", 3, 0, 0, scm_fseek); - -SCM -scm_fseek (object, offset, whence) - SCM object; - SCM offset; - SCM whence; -{ - int rv; - long loff; - - object = SCM_COERCE_OUTPORT (object); - - loff = scm_num2long (offset, (char *)SCM_ARG2, s_fseek); - SCM_ASSERT (SCM_INUMP (whence), whence, SCM_ARG3, s_fseek); - if (SCM_NIMP (object) && SCM_OPFPORTP (object)) - { - struct scm_fport *fp = SCM_FSTREAM (object); - struct scm_port_table *pt = SCM_PTAB_ENTRY (object); - - /* clear the three buffers. the write buffer should be flushed - before changing the position. */ - if (fp->random) - { - SCM_CLEAR_BUFFERS (object, pt); - } /* if not random, lseek will fail. */ - rv = lseek (fp->fdes, loff, SCM_INUM (whence)); - if (rv == -1) - scm_syserror (s_fseek); - } - else - { - SCM_ASSERT (SCM_INUMP (object), object, SCM_ARG1, s_fseek); - rv = lseek (SCM_INUM (object), loff, SCM_INUM (whence)); - if (rv == -1) - scm_syserror (s_fseek); - } - return SCM_UNSPECIFIED; -} - -SCM_PROC (s_redirect_port, "redirect-port", 2, 0, 0, scm_redirect_port); - -SCM -scm_redirect_port (old, new) - SCM old; - SCM new; -{ - int ans, oldfd, newfd; - struct scm_fport *fp; - - old = SCM_COERCE_OUTPORT (old); - new = SCM_COERCE_OUTPORT (new); - - SCM_ASSERT (SCM_NIMP (old) && SCM_OPFPORTP (old), old, SCM_ARG1, s_redirect_port); - SCM_ASSERT (SCM_NIMP (new) && SCM_OPFPORTP (new), new, SCM_ARG2, s_redirect_port); - oldfd = SCM_FPORT_FDES (old); - fp = SCM_FSTREAM (new); - newfd = fp->fdes; - if (oldfd != newfd) - { - struct scm_port_table *pt = SCM_PTAB_ENTRY (new); - - /* must flush to old fdes. don't clear all buffers here - in case dup2 fails. */ - if (pt->write_pos > pt->write_buf) - scm_fflush (new); - ans = dup2 (oldfd, newfd); - if (ans == -1) - scm_syserror (s_redirect_port); - fp->random = SCM_FDES_RANDOM_P (fp->fdes); - /* continue using existing buffers, even if inappropriate. */ - SCM_CLEAR_BUFFERS (new, pt); - } - return SCM_UNSPECIFIED; -} - -SCM_PROC (s_dup_to_fdes, "dup->fdes", 1, 1, 0, scm_dup_to_fdes); -SCM -scm_dup_to_fdes (SCM fd_or_port, SCM fd) -{ - int oldfd, newfd, rv; - - fd_or_port = SCM_COERCE_OUTPORT (fd_or_port); - - if (SCM_INUMP (fd_or_port)) - oldfd = SCM_INUM (fd_or_port); - else - { - SCM_ASSERT (SCM_NIMP (fd_or_port) && SCM_OPFPORTP (fd_or_port), - fd_or_port, SCM_ARG1, s_dup_to_fdes); - oldfd = SCM_FPORT_FDES (fd_or_port); - } - - if (SCM_UNBNDP (fd)) - { - newfd = dup (oldfd); - if (newfd == -1) - scm_syserror (s_dup_to_fdes); - fd = SCM_MAKINUM (newfd); - } - else - { - SCM_ASSERT (SCM_INUMP (fd), fd, SCM_ARG2, s_dup_to_fdes); - newfd = SCM_INUM (fd); - if (oldfd != newfd) - { - scm_evict_ports (newfd); /* see scsh manual. */ - rv = dup2 (oldfd, newfd); - if (rv == -1) - scm_syserror (s_dup_to_fdes); - } - } - return fd; -} - -SCM_PROC (s_fileno, "fileno", 1, 0, 0, scm_fileno); - -SCM -scm_fileno (port) - SCM port; -{ - port = SCM_COERCE_OUTPORT (port); - SCM_ASSERT (SCM_NIMP (port) && SCM_OPFPORTP (port), port, SCM_ARG1, - s_fileno); - return SCM_MAKINUM (SCM_FPORT_FDES (port)); -} - -SCM_PROC (s_isatty, "isatty?", 1, 0, 0, scm_isatty_p); - -SCM -scm_isatty_p (port) - SCM port; -{ - int rv; - - port = SCM_COERCE_OUTPORT (port); - - if (!(SCM_NIMP (port) && SCM_OPFPORTP (port))) - return SCM_BOOL_F; - - rv = isatty (SCM_FPORT_FDES (port)); - return rv ? SCM_BOOL_T : SCM_BOOL_F; -} - - - -SCM_PROC (s_fdopen, "fdopen", 2, 0, 0, scm_fdopen); - -SCM -scm_fdopen (fdes, modes) - SCM fdes; - SCM modes; -{ - SCM port; - - SCM_ASSERT (SCM_INUMP (fdes), fdes, SCM_ARG1, s_fdopen); - SCM_ASSERT (SCM_NIMP (modes) && SCM_ROSTRINGP (modes), modes, SCM_ARG2, - s_fdopen); - SCM_COERCE_SUBSTR (modes); - port = scm_fdes_to_port (SCM_INUM (fdes), SCM_ROCHARS (modes), SCM_BOOL_F); - return port; -} - - - -/* Move a port's underlying file descriptor to a given value. - * Returns #f if fdes is already the given value. - * #t if fdes moved. - * MOVE->FDES is implemented in Scheme and calls this primitive. - */ -SCM_PROC (s_primitive_move_to_fdes, "primitive-move->fdes", 2, 0, 0, scm_primitive_move_to_fdes); - -SCM -scm_primitive_move_to_fdes (port, fd) - SCM port; - SCM fd; -{ - struct scm_fport *stream; - int old_fd; - int new_fd; - int rv; - - port = SCM_COERCE_OUTPORT (port); - - SCM_ASSERT (SCM_NIMP (port) && SCM_OPFPORTP (port), port, SCM_ARG1, s_primitive_move_to_fdes); - SCM_ASSERT (SCM_INUMP (fd), fd, SCM_ARG2, s_primitive_move_to_fdes); - stream = SCM_FSTREAM (port); - old_fd = stream->fdes; - new_fd = SCM_INUM (fd); - if (old_fd == new_fd) - { - return SCM_BOOL_F; - } - scm_evict_ports (new_fd); - rv = dup2 (old_fd, new_fd); - if (rv == -1) - scm_syserror (s_primitive_move_to_fdes); - stream->fdes = new_fd; - SCM_SYSCALL (close (old_fd)); - return SCM_BOOL_T; -} - -/* Return a list of ports using a given file descriptor. */ -SCM_PROC(s_fdes_to_ports, "fdes->ports", 1, 0, 0, scm_fdes_to_ports); - -SCM -scm_fdes_to_ports (fd) - SCM fd; -{ - SCM result = SCM_EOL; - int int_fd; - int i; - - SCM_ASSERT (SCM_INUMP (fd), fd, SCM_ARG1, s_fdes_to_ports); - int_fd = SCM_INUM (fd); - - for (i = 0; i < scm_port_table_size; i++) - { - if (SCM_OPFPORTP (scm_port_table[i]->port) - && ((struct scm_fport *) scm_port_table[i]->stream)->fdes == int_fd) - result = scm_cons (scm_port_table[i]->port, result); - } - return result; -} - - -void -scm_init_ioext () -{ - /* fseek() symbols. */ - scm_sysintern ("SEEK_SET", SCM_MAKINUM (SEEK_SET)); - scm_sysintern ("SEEK_CUR", SCM_MAKINUM (SEEK_CUR)); - scm_sysintern ("SEEK_END", SCM_MAKINUM (SEEK_END)); - -#include "ioext.x" -} - +/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2006 Free Software Foundation, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 3 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 the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + + + + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include +#include + +#include "libguile/_scm.h" +#include "libguile/dynwind.h" +#include "libguile/feature.h" +#include "libguile/fports.h" +#include "libguile/hashtab.h" +#include "libguile/ioext.h" +#include "libguile/ports.h" +#include "libguile/strings.h" +#include "libguile/validate.h" + +#include + +#ifdef HAVE_IO_H +#include +#endif +#ifdef HAVE_UNISTD_H +#include +#endif + + +SCM_DEFINE (scm_ftell, "ftell", 1, 0, 0, + (SCM fd_port), + "Return an integer representing the current position of\n" + "@var{fd_port}, measured from the beginning. Equivalent to:\n" + "\n" + "@lisp\n" + "(seek port 0 SEEK_CUR)\n" + "@end lisp") +#define FUNC_NAME s_scm_ftell +{ + return scm_seek (fd_port, SCM_INUM0, scm_from_int (SEEK_CUR)); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_redirect_port, "redirect-port", 2, 0, 0, + (SCM old, SCM new), + "This procedure takes two ports and duplicates the underlying file\n" + "descriptor from @var{old} into @var{new}. The\n" + "current file descriptor in @var{new} will be closed.\n" + "After the redirection the two ports will share a file position\n" + "and file status flags.\n\n" + "The return value is unspecified.\n\n" + "Unexpected behaviour can result if both ports are subsequently used\n" + "and the original and/or duplicate ports are buffered.\n\n" + "This procedure does not have any side effects on other ports or\n" + "revealed counts.") +#define FUNC_NAME s_scm_redirect_port +{ + int ans, oldfd, newfd; + scm_t_fport *fp; + + old = SCM_COERCE_OUTPORT (old); + new = SCM_COERCE_OUTPORT (new); + + SCM_VALIDATE_OPFPORT (1, old); + SCM_VALIDATE_OPFPORT (2, new); + oldfd = SCM_FPORT_FDES (old); + fp = SCM_FSTREAM (new); + newfd = fp->fdes; + if (oldfd != newfd) + { + scm_t_port *pt = SCM_PTAB_ENTRY (new); + scm_t_port *old_pt = SCM_PTAB_ENTRY (old); + scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (new)]; + + /* must flush to old fdes. */ + if (pt->rw_active == SCM_PORT_WRITE) + ptob->flush (new); + else if (pt->rw_active == SCM_PORT_READ) + scm_end_input (new); + ans = dup2 (oldfd, newfd); + if (ans == -1) + SCM_SYSERROR; + pt->rw_random = old_pt->rw_random; + /* continue using existing buffers, even if inappropriate. */ + } + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + +SCM_DEFINE (scm_dup_to_fdes, "dup->fdes", 1, 1, 0, + (SCM fd_or_port, SCM fd), + "Return a new integer file descriptor referring to the open file\n" + "designated by @var{fd_or_port}, which must be either an open\n" + "file port or a file descriptor.") +#define FUNC_NAME s_scm_dup_to_fdes +{ + int oldfd, newfd, rv; + + fd_or_port = SCM_COERCE_OUTPORT (fd_or_port); + + if (scm_is_integer (fd_or_port)) + oldfd = scm_to_int (fd_or_port); + else + { + SCM_VALIDATE_OPFPORT (1, fd_or_port); + oldfd = SCM_FPORT_FDES (fd_or_port); + } + + if (SCM_UNBNDP (fd)) + { + newfd = dup (oldfd); + if (newfd == -1) + SCM_SYSERROR; + fd = scm_from_int (newfd); + } + else + { + newfd = scm_to_int (fd); + if (oldfd != newfd) + { + scm_evict_ports (newfd); /* see scsh manual. */ + rv = dup2 (oldfd, newfd); + if (rv == -1) + SCM_SYSERROR; + } + } + return fd; +} +#undef FUNC_NAME + + +SCM_DEFINE (scm_dup2, "dup2", 2, 0, 0, + (SCM oldfd, SCM newfd), + "A simple wrapper for the @code{dup2} system call.\n" + "Copies the file descriptor @var{oldfd} to descriptor\n" + "number @var{newfd}, replacing the previous meaning\n" + "of @var{newfd}. Both @var{oldfd} and @var{newfd} must\n" + "be integers.\n" + "Unlike for dup->fdes or primitive-move->fdes, no attempt\n" + "is made to move away ports which are using @var{newfd}.\n" + "The return value is unspecified.") +#define FUNC_NAME s_scm_dup2 +{ + int c_oldfd; + int c_newfd; + int rv; + + c_oldfd = scm_to_int (oldfd); + c_newfd = scm_to_int (newfd); + rv = dup2 (c_oldfd, c_newfd); + if (rv == -1) + SCM_SYSERROR; + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + +SCM_DEFINE (scm_fileno, "fileno", 1, 0, 0, + (SCM port), + "Return the integer file descriptor underlying @var{port}. Does\n" + "not change its revealed count.") +#define FUNC_NAME s_scm_fileno +{ + port = SCM_COERCE_OUTPORT (port); + SCM_VALIDATE_OPFPORT (1, port); + return scm_from_int (SCM_FPORT_FDES (port)); +} +#undef FUNC_NAME + +/* GJB:FIXME:: why does this not throw + an error if the arg is not a port? + This proc as is would be better names isattyport? + if it is not going to assume that the arg is a port + + [cmm] I don't see any problem with the above. why should a type + predicate assume _anything_ about its argument? +*/ +SCM_DEFINE (scm_isatty_p, "isatty?", 1, 0, 0, + (SCM port), + "Return @code{#t} if @var{port} is using a serial non--file\n" + "device, otherwise @code{#f}.") +#define FUNC_NAME s_scm_isatty_p +{ + int rv; + + port = SCM_COERCE_OUTPORT (port); + + if (!SCM_OPFPORTP (port)) + return SCM_BOOL_F; + + rv = isatty (SCM_FPORT_FDES (port)); + return scm_from_bool(rv); +} +#undef FUNC_NAME + + + +SCM_DEFINE (scm_fdopen, "fdopen", 2, 0, 0, + (SCM fdes, SCM modes), + "Return a new port based on the file descriptor @var{fdes}.\n" + "Modes are given by the string @var{modes}. The revealed count\n" + "of the port is initialized to zero. The modes string is the\n" + "same as that accepted by @ref{File Ports, open-file}.") +#define FUNC_NAME s_scm_fdopen +{ + return scm_i_fdes_to_port (scm_to_int (fdes), + scm_i_mode_bits (modes), SCM_BOOL_F); +} +#undef FUNC_NAME + + + +/* Move a port's underlying file descriptor to a given value. + * Returns #f if fdes is already the given value. + * #t if fdes moved. + * MOVE->FDES is implemented in Scheme and calls this primitive. + */ +SCM_DEFINE (scm_primitive_move_to_fdes, "primitive-move->fdes", 2, 0, 0, + (SCM port, SCM fd), + "Moves the underlying file descriptor for @var{port} to the integer\n" + "value @var{fd} without changing the revealed count of @var{port}.\n" + "Any other ports already using this descriptor will be automatically\n" + "shifted to new descriptors and their revealed counts reset to zero.\n" + "The return value is @code{#f} if the file descriptor already had the\n" + "required value or @code{#t} if it was moved.") +#define FUNC_NAME s_scm_primitive_move_to_fdes +{ + scm_t_fport *stream; + int old_fd; + int new_fd; + int rv; + + port = SCM_COERCE_OUTPORT (port); + + SCM_VALIDATE_OPFPORT (1, port); + stream = SCM_FSTREAM (port); + old_fd = stream->fdes; + new_fd = scm_to_int (fd); + if (old_fd == new_fd) + { + return SCM_BOOL_F; + } + scm_evict_ports (new_fd); + rv = dup2 (old_fd, new_fd); + if (rv == -1) + SCM_SYSERROR; + stream->fdes = new_fd; + SCM_SYSCALL (close (old_fd)); + return SCM_BOOL_T; +} +#undef FUNC_NAME + +static SCM +get_matching_port (void *closure, SCM port, SCM val, SCM result) +{ + int fd = * (int *) closure; + scm_t_port *entry = SCM_PTAB_ENTRY (port); + + if (SCM_OPFPORTP (port) + && ((scm_t_fport *) entry->stream)->fdes == fd) + result = scm_cons (port, result); + + return result; +} + +/* Return a list of ports using a given file descriptor. */ +SCM_DEFINE (scm_fdes_to_ports, "fdes->ports", 1, 0, 0, + (SCM fd), + "Return a list of existing ports which have @var{fd} as an\n" + "underlying file descriptor, without changing their revealed\n" + "counts.") +#define FUNC_NAME s_scm_fdes_to_ports +{ + SCM result = SCM_EOL; + int int_fd = scm_to_int (fd); + + scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); + result = scm_internal_hash_fold (get_matching_port, + (void*) &int_fd, result, + scm_i_port_weak_hash); + scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); + return result; +} +#undef FUNC_NAME + + +void +scm_init_ioext () +{ + scm_add_feature ("i/o-extensions"); + +#include "libguile/ioext.x" +} + + +/* + Local Variables: + c-file-style: "gnu" + End: +*/