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/* Copyright (C) 1995, 1996, 1997, 1998, 1999 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 <stdio.h>
#include "_scm.h"
#include "ports.h"
#include "read.h"
#include "fports.h"
#include "unif.h"
#include "chars.h"
#include "ioext.h"
#include <fcntl.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#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)
{
scm_port *pt = SCM_PTAB_ENTRY (port);
unsigned char *end;
/* I thought reading lines was simple. Mercy me. */
/* The common case: 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 = scm_must_malloc (buf_len + 1, "%read-line");
memcpy (buf, pt->read_pos, buf_len);
pt->read_pos += buf_len;
buf[buf_len] = '\0';
*len_p = buf_len;
return buf;
}
/* 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 = scm_must_malloc (buf_size + 1, "%read-line");
int buf_len = 0;
for (;;)
{
if (buf_len + len > buf_size)
{
int new_size = (buf_len + len) * 2;
buf = scm_must_realloc (buf, buf_size + 1, new_size + 1,
"%read-line");
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. */
if (scm_fill_input (port) == 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;
}
/* 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 = scm_must_realloc (buf, buf_size + 1, buf_len + 1, "%read-line");
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;
{
scm_port *pt;
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);
}
pt = SCM_PTAB_ENTRY (port);
if (pt->rw_active == SCM_PORT_WRITE)
scm_ptobs[SCM_PTOBNUM (port)].flush (port);
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_done_malloc (-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);
SCM_COL (port) += slen;
}
}
if (pt->rw_random)
pt->rw_active = SCM_PORT_READ;
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;
{
return scm_seek (object, SCM_INUM0, SCM_MAKINUM (SEEK_CUR));
}
SCM_PROC (s_fseek, "fseek", 3, 0, 0, scm_fseek);
SCM
scm_fseek (object, offset, whence)
SCM object;
SCM offset;
SCM whence;
{
scm_seek (object, offset, whence);
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)
{
scm_port *pt = SCM_PTAB_ENTRY (new);
scm_port *old_pt = SCM_PTAB_ENTRY (old);
scm_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 (s_redirect_port);
pt->rw_random = old_pt->rw_random;
/* continue using existing buffers, even if inappropriate. */
}
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 ()
{
#include "ioext.x"
}
|