/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
- * 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ * 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 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
#include <stdio.h>
#include <fcntl.h>
-#include "libguile/_scm.h"
-#include "libguile/strings.h"
-#include "libguile/validate.h"
-#include "libguile/gc.h"
-#include "libguile/posix.h"
-#include "libguile/dynwind.h"
-#include "libguile/hashtab.h"
-
-#include "libguile/fports.h"
#ifdef HAVE_STRING_H
#include <string.h>
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
#include <sys/stat.h>
#endif
-#ifdef HAVE_POLL_H
#include <poll.h>
-#endif
#include <errno.h>
#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/select.h>
#include <full-write.h>
-#include "libguile/iselect.h"
-
-/* Some defines for Windows (native port, not Cygwin). */
-#ifdef __MINGW32__
-# include <sys/stat.h>
-# include <winsock2.h>
-#endif /* __MINGW32__ */
-
-#include <full-write.h>
-
-/* Mingw (version 3.4.5, circa 2006) has ftruncate as an alias for chsize
- already, but have this code here in case that wasn't so in past versions,
- or perhaps to help other minimal DOS environments.
-
- gnulib ftruncate.c has code using fcntl F_CHSIZE and F_FREESP, which
- might be possibilities if we've got other systems without ftruncate. */
+#include "libguile/_scm.h"
+#include "libguile/strings.h"
+#include "libguile/validate.h"
+#include "libguile/gc.h"
+#include "libguile/posix.h"
+#include "libguile/dynwind.h"
+#include "libguile/hashtab.h"
-#if defined HAVE_CHSIZE && ! defined HAVE_FTRUNCATE
-# define ftruncate(fd, size) chsize (fd, size)
-# undef HAVE_FTRUNCATE
-# define HAVE_FTRUNCATE 1
-#endif
+#include "libguile/fports.h"
#if SIZEOF_OFF_T == SIZEOF_INT
#define OFF_T_MAX INT_MAX
{
int cmode;
long csize;
- SCM drained;
+ size_t ndrained;
+ char *drained;
scm_t_port *pt;
port = SCM_COERCE_OUTPORT (port);
pt = SCM_PTAB_ENTRY (port);
if (SCM_INPUT_PORT_P (port))
- drained = scm_drain_input (port);
+ {
+ /* Drain pending input from PORT. Don't use `scm_drain_input' since
+ it returns a string, whereas we want binary input here. */
+ ndrained = pt->read_end - pt->read_pos;
+ if (pt->read_buf == pt->putback_buf)
+ ndrained += pt->saved_read_end - pt->saved_read_pos;
+
+ if (ndrained > 0)
+ {
+ drained = scm_gc_malloc_pointerless (ndrained, "file port");
+ scm_take_from_input_buffers (port, drained, ndrained);
+ }
+ }
else
- drained = scm_nullstr;
+ ndrained = 0;
if (SCM_OUTPUT_PORT_P (port))
scm_flush_unlocked (port);
scm_fport_buffer_add (port, csize, csize);
- if (scm_is_true (drained) && scm_c_string_length (drained))
- scm_unread_string (drained, port);
+ if (ndrained > 0)
+ /* Put DRAINED back to PORT. */
+ scm_unget_bytes ((unsigned char *) drained, ndrained, port);
return SCM_UNSPECIFIED;
}
}
}
+/* scm_open_file_with_encoding
+ Return a new port open on a given file.
-/* scm_open_file
- * Return a new port open on a given file.
- *
- * The mode string must match the pattern: [rwa+]** which
- * is interpreted in the usual unix way.
- *
- * Return the new port.
- */
-SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0,
- (SCM filename, SCM mode),
- "Open the file whose name is @var{filename}, and return a port\n"
- "representing that file. The attributes of the port are\n"
- "determined by the @var{mode} string. The way in which this is\n"
- "interpreted is similar to C stdio. The first character must be\n"
- "one of the following:\n"
- "@table @samp\n"
- "@item r\n"
- "Open an existing file for input.\n"
- "@item w\n"
- "Open a file for output, creating it if it doesn't already exist\n"
- "or removing its contents if it does.\n"
- "@item a\n"
- "Open a file for output, creating it if it doesn't already\n"
- "exist. All writes to the port will go to the end of the file.\n"
- "The \"append mode\" can be turned off while the port is in use\n"
- "@pxref{Ports and File Descriptors, fcntl}\n"
- "@end table\n"
- "The following additional characters can be appended:\n"
- "@table @samp\n"
- "@item b\n"
- "Open the underlying file in binary mode, if supported by the system.\n"
- "Also, open the file using the binary-compatible character encoding\n"
- "\"ISO-8859-1\", ignoring the port's encoding and the coding declaration\n"
- "at the top of the input file, if any.\n"
- "@item +\n"
- "Open the port for both input and output. E.g., @code{r+}: open\n"
- "an existing file for both input and output.\n"
- "@item 0\n"
- "Create an \"unbuffered\" port. In this case input and output\n"
- "operations are passed directly to the underlying port\n"
- "implementation without additional buffering. This is likely to\n"
- "slow down I/O operations. The buffering mode can be changed\n"
- "while a port is in use @pxref{Ports and File Descriptors,\n"
- "setvbuf}\n"
- "@item l\n"
- "Add line-buffering to the port. The port output buffer will be\n"
- "automatically flushed whenever a newline character is written.\n"
- "@end table\n"
- "When the file is opened, this procedure will scan for a coding\n"
- "declaration@pxref{Character Encoding of Source Files}. If present\n"
- "will use that encoding for interpreting the file. Otherwise, the\n"
- "port's encoding will be used.\n"
- "\n"
- "In theory we could create read/write ports which were buffered\n"
- "in one direction only. However this isn't included in the\n"
- "current interfaces. If a file cannot be opened with the access\n"
- "requested, @code{open-file} throws an exception.")
-#define FUNC_NAME s_scm_open_file
+ The mode string must match the pattern: [rwa+]** which
+ is interpreted in the usual unix way.
+
+ Unless binary mode is requested, the character encoding of the new
+ port is determined as follows: First, if GUESS_ENCODING is true,
+ 'file-encoding' is used to guess the encoding of the file. If
+ GUESS_ENCODING is false or if 'file-encoding' fails, ENCODING is used
+ unless it is also false. As a last resort, the default port encoding
+ is used. It is an error to pass a non-false GUESS_ENCODING or
+ ENCODING if binary mode is requested.
+
+ Return the new port. */
+SCM
+scm_open_file_with_encoding (SCM filename, SCM mode,
+ SCM guess_encoding, SCM encoding)
+#define FUNC_NAME "open-file"
{
SCM port;
- int fdes, flags = 0, use_encoding = 1;
+ int fdes, flags = 0, binary = 0;
unsigned int retries;
char *file, *md, *ptr;
+ if (SCM_UNLIKELY (!(scm_is_false (encoding) || scm_is_string (encoding))))
+ scm_wrong_type_arg_msg (FUNC_NAME, 0, encoding,
+ "encoding to be string or false");
+
scm_dynwind_begin (0);
file = scm_to_locale_string (filename);
flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
break;
case 'b':
- use_encoding = 0;
+ binary = 1;
#if defined (O_BINARY)
flags |= O_BINARY;
#endif
port = scm_i_fdes_to_port (fdes, scm_i_mode_bits (mode),
fport_canonicalize_filename (filename));
- if (use_encoding)
+ if (binary)
{
- /* If this file has a coding declaration, use that as the port
- encoding. */
- if (SCM_INPUT_PORT_P (port))
- {
- char *enc = scm_i_scan_for_encoding (port);
- if (enc != NULL)
- scm_i_set_port_encoding_x (port, enc);
- }
+ if (scm_is_true (encoding))
+ scm_misc_error (FUNC_NAME,
+ "Encoding specified on a binary port",
+ scm_list_1 (encoding));
+ if (scm_is_true (guess_encoding))
+ scm_misc_error (FUNC_NAME,
+ "Request to guess encoding on a binary port",
+ SCM_EOL);
+
+ /* Use the binary-friendly ISO-8859-1 encoding. */
+ scm_i_set_port_encoding_x (port, NULL);
}
else
- /* If this is a binary file, use the binary-friendly ISO-8859-1
- encoding. */
- scm_i_set_port_encoding_x (port, NULL);
+ {
+ char *enc = NULL;
+
+ if (scm_is_true (guess_encoding))
+ {
+ if (SCM_INPUT_PORT_P (port))
+ enc = scm_i_scan_for_encoding (port);
+ else
+ scm_misc_error (FUNC_NAME,
+ "Request to guess encoding on an output-only port",
+ SCM_EOL);
+ }
+
+ if (!enc && scm_is_true (encoding))
+ {
+ char *buf = scm_to_latin1_string (encoding);
+ enc = scm_gc_strdup (buf, "encoding");
+ free (buf);
+ }
+
+ if (enc)
+ scm_i_set_port_encoding_x (port, enc);
+ }
scm_dynwind_end ();
}
#undef FUNC_NAME
-\f
-#ifdef __MINGW32__
-/*
- * Try getting the appropiate file flags for a given file descriptor
- * under Windows. This incorporates some fancy operations because Windows
- * differentiates between file, pipe and socket descriptors.
- */
-#ifndef O_ACCMODE
-# define O_ACCMODE 0x0003
-#endif
+SCM
+scm_open_file (SCM filename, SCM mode)
+{
+ return scm_open_file_with_encoding (filename, mode, SCM_BOOL_F, SCM_BOOL_F);
+}
-static int getflags (int fdes)
+/* We can't define these using SCM_KEYWORD, because keywords have not
+ yet been initialized when scm_init_fports is called. */
+static SCM k_guess_encoding = SCM_UNDEFINED;
+static SCM k_encoding = SCM_UNDEFINED;
+
+SCM_DEFINE (scm_i_open_file, "open-file", 2, 0, 1,
+ (SCM filename, SCM mode, SCM keyword_args),
+ "Open the file whose name is @var{filename}, and return a port\n"
+ "representing that file. The attributes of the port are\n"
+ "determined by the @var{mode} string. The way in which this is\n"
+ "interpreted is similar to C stdio. The first character must be\n"
+ "one of the following:\n"
+ "@table @samp\n"
+ "@item r\n"
+ "Open an existing file for input.\n"
+ "@item w\n"
+ "Open a file for output, creating it if it doesn't already exist\n"
+ "or removing its contents if it does.\n"
+ "@item a\n"
+ "Open a file for output, creating it if it doesn't already\n"
+ "exist. All writes to the port will go to the end of the file.\n"
+ "The \"append mode\" can be turned off while the port is in use\n"
+ "@pxref{Ports and File Descriptors, fcntl}\n"
+ "@end table\n"
+ "The following additional characters can be appended:\n"
+ "@table @samp\n"
+ "@item b\n"
+ "Open the underlying file in binary mode, if supported by the system.\n"
+ "Also, open the file using the binary-compatible character encoding\n"
+ "\"ISO-8859-1\", ignoring the default port encoding.\n"
+ "@item +\n"
+ "Open the port for both input and output. E.g., @code{r+}: open\n"
+ "an existing file for both input and output.\n"
+ "@item 0\n"
+ "Create an \"unbuffered\" port. In this case input and output\n"
+ "operations are passed directly to the underlying port\n"
+ "implementation without additional buffering. This is likely to\n"
+ "slow down I/O operations. The buffering mode can be changed\n"
+ "while a port is in use @pxref{Ports and File Descriptors,\n"
+ "setvbuf}\n"
+ "@item l\n"
+ "Add line-buffering to the port. The port output buffer will be\n"
+ "automatically flushed whenever a newline character is written.\n"
+ "@end table\n"
+ "In theory we could create read/write ports which were buffered\n"
+ "in one direction only. However this isn't included in the\n"
+ "current interfaces. If a file cannot be opened with the access\n"
+ "requested, @code{open-file} throws an exception.")
+#define FUNC_NAME s_scm_i_open_file
{
- int flags = 0;
- struct stat buf;
- int error, optlen = sizeof (int);
-
- /* Is this a socket ? */
- if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0)
- flags = O_RDWR;
- /* Maybe a regular file ? */
- else if (fstat (fdes, &buf) < 0)
- flags = -1;
- else
- {
- /* Or an anonymous pipe handle ? */
- if (buf.st_mode & _S_IFIFO)
- flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0,
- NULL, NULL, NULL) ? O_RDONLY : O_WRONLY;
- /* stdin ? */
- else if (fdes == fileno (stdin) && isatty (fdes))
- flags = O_RDONLY;
- /* stdout / stderr ? */
- else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) &&
- isatty (fdes))
- flags = O_WRONLY;
- else
- flags = buf.st_mode;
- }
- return flags;
+ SCM encoding = SCM_BOOL_F;
+ SCM guess_encoding = SCM_BOOL_F;
+
+ scm_c_bind_keyword_arguments (FUNC_NAME, keyword_args, 0,
+ k_guess_encoding, &guess_encoding,
+ k_encoding, &encoding,
+ SCM_UNDEFINED);
+
+ return scm_open_file_with_encoding (filename, mode,
+ guess_encoding, encoding);
}
-#endif /* __MINGW32__ */
+#undef FUNC_NAME
+\f
/* Building Guile ports from a file descriptor. */
/* Build a Scheme port from an open file descriptor `fdes'.
{
SCM port;
scm_t_fport *fp;
- int flags;
- /* test that fdes is valid. */
-#ifdef __MINGW32__
- flags = getflags (fdes);
-#else
- flags = fcntl (fdes, F_GETFL, 0);
-#endif
+ /* Test that fdes is valid. */
+#ifdef F_GETFL
+ int flags = fcntl (fdes, F_GETFL, 0);
if (flags == -1)
SCM_SYSERROR;
flags &= O_ACCMODE;
{
SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL);
}
+#else
+ /* If we don't have F_GETFL, as on mingw, at least we can test that
+ it is a valid file descriptor. */
+ struct stat st;
+ if (fstat (fdes, &st) != 0)
+ SCM_SYSERROR;
+#endif
fp = (scm_t_fport *) scm_gc_malloc_pointerless (sizeof (scm_t_fport),
"file port");
{
int fdes = SCM_FSTREAM (port)->fdes;
- /* `FD_SETSIZE', which is 1024 on GNU systems, effectively limits the
- highest numerical value of file descriptors that can be monitored.
- Thus, use poll(2) whenever that is possible. */
-
-#ifdef HAVE_POLL
struct pollfd pollfd = { fdes, POLLIN, 0 };
if (poll (&pollfd, 1, 0) < 0)
scm_syserror ("fport_input_waiting");
return pollfd.revents & POLLIN ? 1 : 0;
-
-#elif defined(HAVE_SELECT)
- struct timeval timeout;
- SELECT_TYPE read_set;
- SELECT_TYPE write_set;
- SELECT_TYPE except_set;
-
- FD_ZERO (&read_set);
- FD_ZERO (&write_set);
- FD_ZERO (&except_set);
-
- FD_SET (fdes, &read_set);
-
- timeout.tv_sec = 0;
- timeout.tv_usec = 0;
-
- if (select (SELECT_SET_SIZE,
- &read_set, &write_set, &except_set, &timeout)
- < 0)
- scm_syserror ("fport_input_waiting");
- return FD_ISSET (fdes, &read_set) ? 1 : 0;
-
-#elif HAVE_IOCTL && defined (FIONREAD)
- /* Note: cannot test just defined(FIONREAD) here, since mingw has FIONREAD
- (for use with winsock ioctlsocket()) but not ioctl(). */
- int fdes = SCM_FSTREAM (port)->fdes;
- int remir;
- ioctl(fdes, FIONREAD, &remir);
- return remir;
-
-#else
- scm_misc_error ("fport_input_waiting",
- "Not fully implemented on this platform",
- SCM_EOL);
-#endif
}
return tc;
}
+/* We can't initialize the keywords from 'scm_init_fports', because
+ keywords haven't yet been initialized at that point. */
+void
+scm_init_fports_keywords ()
+{
+ k_guess_encoding = scm_from_latin1_keyword ("guess-encoding");
+ k_encoding = scm_from_latin1_keyword ("encoding");
+}
+
void
scm_init_fports ()
{
HCoop / bpt / guile.git / blobdiff