--- /dev/null
+/* Generic stream implementation.
+ Copyright (C) 1995 Free Software Foundation, Inc.
+ Copyright (C) 1995 Sun Microsystems, Inc.
+ Copyright (C) 1996 Ben Wing.
+
+This file is part of XEmacs.
+
+XEmacs 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.
+
+XEmacs 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 XEmacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* Synched up with: Not in FSF. */
+
+/* Written by Ben Wing. */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "buffer.h"
+#include "insdel.h"
+#include "lstream.h"
+
+#include "sysfile.h"
+#include <errno.h>
+
+/* This function provides a generic buffering stream implementation.
+ Conceptually, you send data to the stream or read data from the
+ stream, not caring what's on the other end of the stream. The
+ other end could be another stream, a file descriptor, a stdio
+ stream, a fixed block of memory, a reallocating block of memory,
+ etc. The main purpose of the stream is to provide a standard
+ interface and to do buffering. Macros are defined to read
+ or write characters, so the calling functions do not have to
+ worry about blocking data together in order to achieve efficiency.
+ */
+
+/* Note that this object is called "stream" in Lisp but "lstream"
+ in C. The reason for this is that "stream" is too generic a name
+ for C; too much likelihood of conflict/confusion with C++, etc. */
+
+/* Functions are as follows:
+
+Lstream *Lstream_new (Lstream_implementation *imp, const char *mode)
+ Allocate and return a new Lstream. This function is not
+ really meant to be called directly; rather, each stream type
+ should provide its own stream creation function, which
+ creates the stream and does any other necessary creation
+ stuff (e.g. opening a file).
+
+void Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
+ int buffering_size)
+ Change the buffering of a stream. See lstream.h. By default
+ the buffering is STREAM_BLOCK_BUFFERED.
+
+int Lstream_flush (Lstream *lstr)
+ Flush out any pending unwritten data in the stream. Clear
+ any buffered input data. Returns 0 on success, -1 on error.
+
+int Lstream_putc (Lstream *stream, int c)
+ Write out one byte to the stream. This is a macro and so
+ it is very efficient. The C argument is only evaluated once
+ but the STREAM argument is evaluated more than once. Returns
+ 0 on success, -1 on error.
+
+int Lstream_getc (Lstream *stream)
+ Read one byte from the stream and returns it as an unsigned
+ char cast to an int, or EOF on end of file or error.
+ This is a macro and so it is very efficient. The STREAM
+ argument is evaluated more than once.
+
+void Lstream_ungetc (Lstream *stream, int c)
+ Push one byte back onto the input queue, cast to unsigned char.
+ This will be the next byte read from the stream. Any number
+ of bytes can be pushed back and will be read in the reverse
+ order they were pushed back -- most recent first. (This is
+ necessary for consistency -- if there are a number of bytes
+ that have been unread and I read and unread a byte, it needs
+ to be the first to be read again.) This is a macro and so it
+ is very efficient. The C argument is only evaluated once but
+ the STREAM argument is evaluated more than once.
+
+int Lstream_fputc (Lstream *stream, int c)
+int Lstream_fgetc (Lstream *stream)
+void Lstream_fungetc (Lstream *stream, int c)
+ Function equivalents of the above macros.
+
+Lstream_data_count Lstream_read (Lstream *stream, void *data,
+ Lstream_data_count size)
+ Read SIZE bytes of DATA from the stream. Return the number of
+ bytes read. 0 means EOF. -1 means an error occurred and no
+ bytes were read.
+
+Lstream_data_count Lstream_write (Lstream *stream, void *data,
+ Lstream_data_count size)
+ Write SIZE bytes of DATA to the stream. Return the number of
+ bytes written. -1 means an error occurred and no bytes were
+ written.
+
+void Lstream_unread (Lstream *stream, void *data, Lstream_data_count size)
+ Push back SIZE bytes of DATA onto the input queue. The
+ next call to Lstream_read() with the same size will read the
+ same bytes back. Note that this will be the case even if
+ there is other pending unread data.
+
+int Lstream_delete (Lstream *stream)
+ Frees all memory associated with the stream is freed. Calling
+ this is not strictly necessary, but it is much more efficient
+ than having the Lstream be garbage-collected.
+
+int Lstream_close (Lstream *stream)
+ Close the stream. All data will be flushed out.
+
+void Lstream_reopen (Lstream *stream)
+ Reopen a closed stream. This enables I/O on it again.
+ This is not meant to be called except from a wrapper routine
+ that reinitializes variables and such -- the close routine
+ may well have freed some necessary storage structures, for
+ example.
+
+void Lstream_rewind (Lstream *stream)
+ Rewind the stream to the beginning.
+*/
+
+#define DEFAULT_BLOCK_BUFFERING_SIZE 512
+#define MAX_READ_SIZE 512
+
+static Lisp_Object
+mark_lstream (Lisp_Object obj)
+{
+ Lstream *lstr = XLSTREAM (obj);
+ return lstr->imp->marker ? (lstr->imp->marker) (obj) : Qnil;
+}
+
+static void
+print_lstream (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
+{
+ Lstream *lstr = XLSTREAM (obj);
+ char buf[200];
+
+ sprintf (buf, "#<INTERNAL OBJECT (XEmacs bug?) (%s lstream) 0x%lx>",
+ lstr->imp->name, (long) lstr);
+ write_c_string (buf, printcharfun);
+}
+
+static void
+finalize_lstream (void *header, int for_disksave)
+{
+ /* WARNING WARNING WARNING. This function (and all finalize functions)
+ may get called more than once on the same object, and may get called
+ (at dump time) on objects that are not being released. */
+ Lstream *lstr = (Lstream *) header;
+
+#if 0 /* this may cause weird Broken Pipes? */
+ if (for_disksave)
+ {
+ Lstream_pseudo_close (lstr);
+ return;
+ }
+#endif
+ if (lstr->flags & LSTREAM_FL_IS_OPEN)
+ {
+ if (for_disksave)
+ {
+ if (lstr->flags & LSTREAM_FL_CLOSE_AT_DISKSAVE)
+ Lstream_close (lstr);
+ }
+ else
+ /* Just close. */
+ Lstream_close (lstr);
+ }
+}
+
+inline static size_t
+aligned_sizeof_lstream (size_t lstream_type_specific_size)
+{
+ return ALIGN_SIZE (offsetof (Lstream, data) + lstream_type_specific_size,
+ ALIGNOF (max_align_t));
+}
+
+static size_t
+sizeof_lstream (const void *header)
+{
+ return aligned_sizeof_lstream (((const Lstream *) header)->imp->size);
+}
+
+DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream,
+ mark_lstream, print_lstream,
+ finalize_lstream, 0, 0, 0,
+ sizeof_lstream, Lstream);
+\f
+void
+Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
+ int buffering_size)
+{
+ lstr->buffering = buffering;
+ switch (buffering)
+ {
+ case LSTREAM_UNBUFFERED:
+ lstr->buffering_size = 0; break;
+ case LSTREAM_BLOCK_BUFFERED:
+ lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break;
+ case LSTREAM_BLOCKN_BUFFERED:
+ lstr->buffering_size = buffering_size; break;
+ case LSTREAM_LINE_BUFFERED:
+ case LSTREAM_UNLIMITED:
+ lstr->buffering_size = INT_MAX; break;
+ }
+}
+
+static const Lstream_implementation *lstream_types[32];
+static Lisp_Object Vlstream_free_list[32];
+static int lstream_type_count;
+
+Lstream *
+Lstream_new (const Lstream_implementation *imp, const char *mode)
+{
+ Lstream *p;
+ int i;
+
+ for (i = 0; i < lstream_type_count; i++)
+ {
+ if (lstream_types[i] == imp)
+ break;
+ }
+
+ if (i == lstream_type_count)
+ {
+ assert (lstream_type_count < countof (lstream_types));
+ lstream_types[lstream_type_count] = imp;
+ Vlstream_free_list[lstream_type_count] =
+ make_lcrecord_list (aligned_sizeof_lstream (imp->size),
+ &lrecord_lstream);
+ lstream_type_count++;
+ }
+
+ p = XLSTREAM (allocate_managed_lcrecord (Vlstream_free_list[i]));
+ /* Zero it out, except the header. */
+ memset ((char *) p + sizeof (p->header), '\0',
+ aligned_sizeof_lstream (imp->size) - sizeof (p->header));
+ p->imp = imp;
+ Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0);
+ p->flags = LSTREAM_FL_IS_OPEN;
+
+ /* convert mode (one of "r", "w", "rc", "wc") to p->flags */
+ assert (mode[0] == 'r' || mode[0] == 'w');
+ assert (mode[1] == 'c' || mode[1] == '\0');
+ p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE);
+ if (mode[1] == 'c')
+ p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
+
+ return p;
+}
+
+void
+Lstream_set_character_mode (Lstream *lstr)
+{
+ lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
+}
+
+void
+Lstream_delete (Lstream *lstr)
+{
+ int i;
+ Lisp_Object val;
+
+ XSETLSTREAM (val, lstr);
+ for (i = 0; i < lstream_type_count; i++)
+ {
+ if (lstream_types[i] == lstr->imp)
+ {
+ free_managed_lcrecord (Vlstream_free_list[i], val);
+ return;
+ }
+ }
+
+ ABORT ();
+}
+
+#define Lstream_internal_error(reason, lstr) \
+ Lstream_signal_simple_error ("Internal error: " reason, lstr)
+
+static void Lstream_signal_simple_error (const char *reason, Lstream *lstr)
+{
+ Lisp_Object obj;
+ XSETLSTREAM (obj, lstr);
+ signal_simple_error (reason, obj);
+}
+
+void
+Lstream_reopen (Lstream *lstr)
+{
+ if (lstr->flags & LSTREAM_FL_IS_OPEN)
+ Lstream_internal_error ("lstream already open", lstr);
+ lstr->flags |= LSTREAM_FL_IS_OPEN;
+}
+
+/* Attempt to flush out all of the buffered data for writing. */
+
+int
+Lstream_flush_out (Lstream *lstr)
+{
+ Lstream_data_count num_written;
+
+ while (lstr->out_buffer_ind > 0)
+ {
+ Lstream_data_count size = lstr->out_buffer_ind;
+ if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
+ Lstream_internal_error ("lstream not open", lstr);
+ if (! (lstr->flags & LSTREAM_FL_WRITE))
+ Lstream_internal_error ("lstream not open for writing", lstr);
+ if (!lstr->imp->writer)
+ Lstream_internal_error ("lstream has no writer", lstr);
+
+ if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
+ /* It's quite possible for us to get passed an incomplete
+ character at the end. We need to spit back that
+ incomplete character. */
+ {
+ const unsigned char *data = lstr->out_buffer;
+ const unsigned char *dataend = data + size - 1;
+ assert (size > 0); /* safety check ... */
+ /* Optimize the most common case. */
+ if (!BYTE_ASCII_P (*dataend))
+ {
+ /* Go back to the beginning of the last (and possibly partial)
+ character, and bump forward to see if the character is
+ complete. */
+ VALIDATE_CHARPTR_BACKWARD (dataend);
+ if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != data + size)
+ /* If not, chop the size down to ignore the last char
+ and stash it away for next time. */
+ size = dataend - data;
+ /* If we don't even have one character to write, then just
+ skip out. */
+ if (size == 0)
+ break;
+ }
+ }
+
+ num_written = (lstr->imp->writer) (lstr, lstr->out_buffer, size);
+ if (num_written == 0)
+ /* If nothing got written, then just hold the data. This may
+ occur, for example, if this stream does non-blocking I/O;
+ the attempt to write the data might have resulted in an
+ EWOULDBLOCK error. */
+ return 0;
+ else if (num_written >= lstr->out_buffer_ind)
+ lstr->out_buffer_ind = 0;
+ else if (num_written > 0)
+ {
+ memmove (lstr->out_buffer, lstr->out_buffer + num_written,
+ lstr->out_buffer_ind - num_written);
+ lstr->out_buffer_ind -= num_written;
+ }
+ else
+ /* If error, just hold the data, for similar reasons as above. */
+ return -1;
+ }
+
+ if (lstr->imp->flusher)
+ return (lstr->imp->flusher) (lstr);
+
+ return 0;
+}
+
+int
+Lstream_flush (Lstream *lstr)
+{
+ if (Lstream_flush_out (lstr) < 0)
+ return -1;
+
+ /* clear out buffered data */
+ lstr->in_buffer_current = lstr->in_buffer_ind = 0;
+ lstr->unget_buffer_ind = 0;
+
+ return 0;
+}
+
+/* We want to add NUM characters. This function ensures that the
+ buffer is large enough for this (per the buffering size specified
+ in the stream) and returns the number of characters we can
+ actually write. If FORCE is set, ignore the buffering size
+ and go ahead and make space for all the chars even if it exceeds
+ the buffering size. (This is used to deal with the possibility
+ that the stream writer might refuse to write any bytes now, e.g.
+ if it's getting EWOULDBLOCK errors. We have to keep stocking them
+ up until they can be written, so as to avoid losing data. */
+
+static Lstream_data_count
+Lstream_adding (Lstream *lstr, Lstream_data_count num, int force)
+{
+ Lstream_data_count size = num + lstr->out_buffer_ind;
+
+ if (size <= lstr->out_buffer_size)
+ return num;
+
+ /* Maybe chop it down so that we don't buffer more characters
+ than our advertised buffering size. */
+ if ((size > lstr->buffering_size) && !force)
+ {
+ size = lstr->buffering_size;
+ /* There might be more data buffered than the buffering size. */
+ if (size <= lstr->out_buffer_ind)
+ return 0;
+ }
+
+ DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char);
+
+ return size - lstr->out_buffer_ind;
+}
+
+/* Like Lstream_write(), but does not handle line-buffering correctly. */
+
+static Lstream_data_count
+Lstream_write_1 (Lstream *lstr, const void *data, Lstream_data_count size)
+{
+ const unsigned char *p = (const unsigned char *) data;
+ Lstream_data_count off = 0;
+ if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
+ Lstream_internal_error ("lstream not open", lstr);
+ if (! (lstr->flags & LSTREAM_FL_WRITE))
+ Lstream_internal_error ("lstream not open for writing", lstr);
+ {
+ int couldnt_write_last_time = 0;
+
+ while (1)
+ {
+ /* Figure out how much we can add to the buffer */
+ Lstream_data_count chunk = Lstream_adding (lstr, size, 0);
+ if (chunk == 0)
+ {
+ if (couldnt_write_last_time)
+ /* Ung, we ran out of space and tried to flush
+ the buffer, but it didn't work because the stream
+ writer is refusing to accept any data. So we
+ just have to squirrel away all the rest of the
+ stuff. */
+ chunk = Lstream_adding (lstr, size, 1);
+ else
+ couldnt_write_last_time = 1;
+ }
+ /* Do it. */
+ if (chunk > 0)
+ {
+ memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk);
+ lstr->out_buffer_ind += chunk;
+ lstr->byte_count += chunk;
+ size -= chunk;
+ off += chunk;
+ }
+ /* If the buffer is full and we have more to add, flush it out. */
+ if (size > 0)
+ {
+ if (Lstream_flush_out (lstr) < 0)
+ {
+ if (off == 0)
+ return -1;
+ else
+ return off;
+ }
+ }
+ else
+ break;
+ }
+ }
+ return off;
+}
+
+/* If the stream is not line-buffered, then we can just call
+ Lstream_write_1(), which writes in chunks. Otherwise, we
+ repeatedly call Lstream_putc(), which knows how to handle
+ line buffering. Returns number of bytes written. */
+
+Lstream_data_count
+Lstream_write (Lstream *lstr, const void *data, Lstream_data_count size)
+{
+ Lstream_data_count i;
+ const unsigned char *p = (const unsigned char *) data;
+
+ if (size == 0)
+ return size;
+ if (lstr->buffering != LSTREAM_LINE_BUFFERED)
+ return Lstream_write_1 (lstr, data, size);
+ for (i = 0; i < size; i++)
+ {
+ if (Lstream_putc (lstr, p[i]) < 0)
+ break;
+ }
+ return i == 0 ? -1 : i;
+}
+
+int
+Lstream_was_blocked_p (Lstream *lstr)
+{
+ return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0;
+}
+
+static Lstream_data_count
+Lstream_raw_read (Lstream *lstr, unsigned char *buffer,
+ Lstream_data_count size)
+{
+ if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
+ Lstream_internal_error ("lstream not open", lstr);
+ if (! (lstr->flags & LSTREAM_FL_READ))
+ Lstream_internal_error ("lstream not open for reading", lstr);
+ if (!lstr->imp->reader)
+ Lstream_internal_error ("lstream has no reader", lstr);
+
+ return (lstr->imp->reader) (lstr, buffer, size);
+}
+
+/* Assuming the buffer is empty, fill it up again. */
+
+static Lstream_data_count
+Lstream_read_more (Lstream *lstr)
+{
+#if 0
+ Lstream_data_count size_needed
+ = max (1, min (MAX_READ_SIZE, lstr->buffering_size));
+#else
+ /* If someone requested a larger buffer size, so be it! */
+ Lstream_data_count size_needed =
+ max (1, lstr->buffering_size);
+#endif
+ Lstream_data_count size_gotten;
+
+ DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size,
+ size_needed, unsigned char);
+ size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed);
+ lstr->in_buffer_current = max (0, size_gotten);
+ lstr->in_buffer_ind = 0;
+ return size_gotten < 0 ? -1 : size_gotten;
+}
+
+Lstream_data_count
+Lstream_read (Lstream *lstr, void *data, Lstream_data_count size)
+{
+ unsigned char *p = (unsigned char *) data;
+ Lstream_data_count off = 0;
+ Lstream_data_count chunk;
+ int error_occurred = 0;
+
+ if (size == 0)
+ return 0;
+
+ /* First try to get some data from the unget buffer */
+ chunk = min (size, lstr->unget_buffer_ind);
+ if (chunk > 0)
+ {
+ /* The bytes come back in reverse order. */
+ for (; off < chunk; off++)
+ p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind];
+ lstr->byte_count += chunk;
+ size -= chunk;
+ }
+
+ while (size > 0)
+ {
+ /* Take whatever we can from the in buffer */
+ chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind);
+ if (chunk > 0)
+ {
+ memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk);
+ lstr->in_buffer_ind += chunk;
+ lstr->byte_count += chunk;
+ size -= chunk;
+ off += chunk;
+ }
+
+ /* If we need some more, try to get some more from the stream's end */
+ if (size > 0)
+ {
+ Lstream_data_count retval = Lstream_read_more (lstr);
+ if (retval < 0)
+ error_occurred = 1;
+ if (retval <= 0)
+ break;
+ }
+ }
+
+ /* #### Beware of OFF ending up 0. */
+ if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) && off > 0)
+ {
+ /* It's quite possible for us to get passed an incomplete
+ character at the end. We need to spit back that
+ incomplete character. */
+ const unsigned char *dataend = p + off - 1;
+ /* Optimize the most common case. */
+ if (!BYTE_ASCII_P (*dataend))
+ {
+ /* Go back to the beginning of the last (and possibly partial)
+ character, and bump forward to see if the character is
+ complete. */
+ VALIDATE_CHARPTR_BACKWARD (dataend);
+ if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != p + off)
+ {
+ Lstream_data_count newoff = dataend - p;
+ /* If not, chop the size down to ignore the last char
+ and stash it away for next time. */
+ Lstream_unread (lstr, dataend, off - newoff);
+ off = newoff;
+ }
+ }
+ }
+
+ return off == 0 && error_occurred ? -1 : off;
+}
+
+void
+Lstream_unread (Lstream *lstr, const void *data, Lstream_data_count size)
+{
+ const unsigned char *p = (const unsigned char *) data;
+
+ /* Make sure buffer is big enough */
+ DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size,
+ lstr->unget_buffer_ind + size, unsigned char);
+
+ lstr->byte_count -= size;
+
+ /* Bytes have to go on in reverse order -- they are reversed
+ again when read back. */
+ while (size--)
+ lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size];
+}
+
+int
+Lstream_rewind (Lstream *lstr)
+{
+ if (!lstr->imp->rewinder)
+ Lstream_internal_error ("lstream has no rewinder", lstr);
+ if (Lstream_flush (lstr) < 0)
+ return -1;
+ lstr->byte_count = 0;
+ return (lstr->imp->rewinder) (lstr);
+}
+
+int
+Lstream_seekable_p (Lstream *lstr)
+{
+ if (!lstr->imp->rewinder)
+ return 0;
+ if (!lstr->imp->seekable_p)
+ return 1;
+ return (lstr->imp->seekable_p) (lstr);
+}
+
+static int
+Lstream_pseudo_close (Lstream *lstr)
+{
+ if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
+ Lstream_internal_error ("lstream is not open", lstr);
+
+ /* don't check errors here -- best not to risk file descriptor loss */
+ return Lstream_flush (lstr);
+}
+
+int
+Lstream_close (Lstream *lstr)
+{
+ int rc = 0;
+
+ if (lstr->flags & LSTREAM_FL_IS_OPEN)
+ {
+ rc = Lstream_pseudo_close (lstr);
+ /*
+ * We used to return immediately if the closer method reported
+ * failure, leaving the stream open. But this is no good, for
+ * the following reasons.
+ *
+ * 1. The finalizer method used in GC makes no provision for
+ * failure, so we must not return without freeing buffer
+ * memory.
+ *
+ * 2. The closer method may have already freed some memory
+ * used for I/O in this stream. E.g. encoding_closer frees
+ * ENCODING_STREAM_DATA(stream)->runoff. If a writer method
+ * tries to use this buffer later, it will write into memory
+ * that may have been allocated elsewhere. Sometime later
+ * you will see a sign that says "Welcome to Crash City."
+ *
+ * 3. The closer can report failure if a flush fails in the
+ * other stream in a MULE encoding/decoding stream pair.
+ * The other stream in the pair is closed, but returning
+ * early leaves the current stream open. If we try to
+ * flush the current stream later, we will crash when the
+ * flusher notices that the other end stream is closed.
+ *
+ * So, we no longer abort the close if the closer method
+ * reports some kind of failure. We still report the failure
+ * to the caller.
+ */
+ if (lstr->imp->closer)
+ if ((lstr->imp->closer) (lstr) < 0)
+ rc = -1;
+ }
+
+ lstr->flags &= ~LSTREAM_FL_IS_OPEN;
+ lstr->byte_count = 0;
+ /* Note that Lstream_flush() reset all the buffer indices. That way,
+ the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc()
+ on a closed stream will call into the function equivalents, which will
+ cause an error. */
+
+ /* We set the pointers to 0 so that we don't lose when this function
+ is called more than once on the same object */
+ if (lstr->out_buffer)
+ {
+ xfree (lstr->out_buffer);
+ lstr->out_buffer = 0;
+ }
+ if (lstr->in_buffer)
+ {
+ xfree (lstr->in_buffer);
+ lstr->in_buffer = 0;
+ }
+ if (lstr->unget_buffer)
+ {
+ xfree (lstr->unget_buffer);
+ lstr->unget_buffer = 0;
+ }
+
+ return rc;
+}
+
+int
+Lstream_fputc (Lstream *lstr, int c)
+{
+ unsigned char ch = (unsigned char) c;
+ Lstream_data_count retval = Lstream_write_1 (lstr, &ch, 1);
+ if (retval >= 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n')
+ return Lstream_flush_out (lstr);
+ return retval < 0 ? -1 : 0;
+}
+
+int
+Lstream_fgetc (Lstream *lstr)
+{
+ unsigned char ch;
+ if (Lstream_read (lstr, &ch, 1) <= 0)
+ return -1;
+ return ch;
+}
+
+void
+Lstream_fungetc (Lstream *lstr, int c)
+{
+ unsigned char ch = (unsigned char) c;
+ Lstream_unread (lstr, &ch, 1);
+}
+
+\f
+/************************ some stream implementations *********************/
+
+/*********** a stdio stream ***********/
+
+struct stdio_stream
+{
+ FILE *file;
+ int closing;
+};
+
+#define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio)
+
+DEFINE_LSTREAM_IMPLEMENTATION ("stdio", lstream_stdio,
+ sizeof (struct stdio_stream));
+
+static Lisp_Object
+make_stdio_stream_1 (FILE *stream, int flags, const char *mode)
+{
+ Lisp_Object obj;
+ Lstream *lstr = Lstream_new (lstream_stdio, mode);
+ struct stdio_stream *str = STDIO_STREAM_DATA (lstr);
+ str->file = stream;
+ str->closing = flags & LSTR_CLOSING;
+ lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
+ XSETLSTREAM (obj, lstr);
+ return obj;
+}
+
+Lisp_Object
+make_stdio_input_stream (FILE *stream, int flags)
+{
+ return make_stdio_stream_1 (stream, flags, "r");
+}
+
+Lisp_Object
+make_stdio_output_stream (FILE *stream, int flags)
+{
+ return make_stdio_stream_1 (stream, flags, "w");
+}
+
+/* #### From reading the Unix 98 specification, it appears that if we
+ want stdio_reader() to be completely correct, we should check for
+ 0 < val < size and if so, check to see if an error has occurred.
+ If an error has occurred, but val is non-zero, we should go ahead
+ and act as if the read was successful, but remember in some fashion
+ or other, that an error has occurred, and report that on the next
+ call to stdio_reader instead of calling fread() again.
+
+ Currently, in such a case, we end up calling fread() twice and we
+ assume that
+
+ 1) this is not harmful, and
+ 2) the error will still be reported on the second read.
+
+ This is probably reasonable, so I don't think we should change this
+ code (it could even be argued that the error might have fixed
+ itself, so we should do the fread() again. */
+
+static Lstream_data_count
+stdio_reader (Lstream *stream, unsigned char *data, Lstream_data_count size)
+{
+ struct stdio_stream *str = STDIO_STREAM_DATA (stream);
+ Lstream_data_count val = fread (data, 1, size, str->file);
+ if (!val && ferror (str->file))
+ return -1;
+ return val;
+}
+
+static Lstream_data_count
+stdio_writer (Lstream *stream, const unsigned char *data,
+ Lstream_data_count size)
+{
+ struct stdio_stream *str = STDIO_STREAM_DATA (stream);
+ Lstream_data_count val = fwrite (data, 1, size, str->file);
+ if (!val && ferror (str->file))
+ return -1;
+ return val;
+}
+
+static int
+stdio_rewinder (Lstream *stream)
+{
+ rewind (STDIO_STREAM_DATA (stream)->file);
+ return 0;
+}
+
+static int
+stdio_seekable_p (Lstream *stream)
+{
+ struct stat lestat;
+ struct stdio_stream *str = STDIO_STREAM_DATA (stream);
+
+ if (fstat (fileno (str->file), &lestat) < 0)
+ return 0;
+ return S_ISREG (lestat.st_mode);
+}
+
+static int
+stdio_flusher (Lstream *stream)
+{
+ struct stdio_stream *str = STDIO_STREAM_DATA (stream);
+ if (stream->flags & LSTREAM_FL_WRITE)
+ return fflush (str->file);
+ else
+ return 0;
+}
+
+static int
+stdio_closer (Lstream *stream)
+{
+ struct stdio_stream *str = STDIO_STREAM_DATA (stream);
+ if (str->closing)
+ return fclose (str->file);
+ else
+ if (stream->flags & LSTREAM_FL_WRITE)
+ return fflush (str->file);
+ else
+ return 0;
+}
+
+/*********** a file descriptor ***********/
+
+struct filedesc_stream
+{
+ int fd;
+ int pty_max_bytes;
+ Bufbyte eof_char;
+ int starting_pos;
+ int current_pos;
+ int end_pos;
+ int chars_sans_newline;
+ unsigned int closing :1;
+ unsigned int allow_quit :1;
+ unsigned int blocked_ok :1;
+ unsigned int pty_flushing :1;
+ unsigned int blocking_error_p :1;
+};
+
+#define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc)
+
+DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", lstream_filedesc,
+ sizeof (struct filedesc_stream));
+
+/* Make a stream that reads from or writes to a file descriptor FILEDESC.
+ OFFSET is the offset from the *current* file pointer that the reading
+ should start at. COUNT is the number of bytes to be read (it is
+ ignored when writing); -1 for unlimited. */
+static Lisp_Object
+make_filedesc_stream_1 (int filedesc, int offset, int count, int flags,
+ const char *mode)
+{
+ Lisp_Object obj;
+ Lstream *lstr = Lstream_new (lstream_filedesc, mode);
+ struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr);
+ fstr->fd = filedesc;
+ fstr->closing = !!(flags & LSTR_CLOSING);
+ fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT);
+ fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK);
+ fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING);
+ fstr->blocking_error_p = 0;
+ fstr->chars_sans_newline = 0;
+ fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR);
+ fstr->current_pos = max (fstr->starting_pos, 0);
+ if (count < 0)
+ fstr->end_pos = -1;
+ else
+ fstr->end_pos = fstr->starting_pos + count;
+ lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
+ XSETLSTREAM (obj, lstr);
+ return obj;
+}
+
+Lisp_Object
+make_filedesc_input_stream (int filedesc, int offset, int count, int flags)
+{
+ return make_filedesc_stream_1 (filedesc, offset, count, flags, "r");
+}
+
+Lisp_Object
+make_filedesc_output_stream (int filedesc, int offset, int count, int flags)
+{
+ return make_filedesc_stream_1 (filedesc, offset, count, flags, "w");
+}
+
+static Lstream_data_count
+filedesc_reader (Lstream *stream, unsigned char *data, Lstream_data_count size)
+{
+ Lstream_data_count nread;
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ if (str->end_pos >= 0)
+ size = min (size, (Lstream_data_count) (str->end_pos - str->current_pos));
+ nread = str->allow_quit ?
+ read_allowing_quit (str->fd, data, size) :
+ read (str->fd, data, size);
+ if (nread > 0)
+ str->current_pos += nread;
+ return nread;
+}
+
+static int
+errno_would_block_p (int val)
+{
+#ifdef EWOULDBLOCK
+ if (val == EWOULDBLOCK)
+ return 1;
+#endif
+#ifdef EAGAIN
+ if (val == EAGAIN)
+ return 1;
+#endif
+ return 0;
+}
+
+static Lstream_data_count
+filedesc_writer (Lstream *stream, const unsigned char *data,
+ Lstream_data_count size)
+{
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ Lstream_data_count retval;
+ int need_newline = 0;
+
+ /* This function would be simple if it were not for the blasted
+ PTY max-bytes stuff. Why the hell can't they just have written
+ the PTY drivers right so this problem doesn't exist?
+
+ Maybe all the PTY crap here should be moved into another stream
+ that does nothing but periodically insert EOF's as necessary. */
+ if (str->pty_flushing)
+ {
+ /* To make life easy, only send out one line at the most. */
+ const unsigned char *ptr;
+
+ ptr = (const unsigned char *) memchr (data, '\n', size);
+ if (ptr)
+ need_newline = 1;
+ else
+ ptr = data + size;
+ if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline)
+ {
+ ptr = data + str->pty_max_bytes - str->chars_sans_newline;
+ need_newline = 0;
+ }
+ size = ptr - data;
+ }
+
+ /**** start of non-PTY-crap ****/
+ if (size > 0)
+ retval = str->allow_quit ?
+ write_allowing_quit (str->fd, data, size) :
+ write (str->fd, data, size);
+ else
+ retval = 0;
+ if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok)
+ {
+ str->blocking_error_p = 1;
+ return 0;
+ }
+ str->blocking_error_p = 0;
+ if (retval < 0)
+ return retval;
+ /**** end non-PTY-crap ****/
+
+ if (str->pty_flushing)
+ {
+ str->chars_sans_newline += retval;
+ /* Note that a newline was not among the bytes written out.
+ Add to the number of non-newline bytes written out,
+ and flush with an EOF if necessary. Be careful to
+ keep track of write errors as we go along and look
+ out for EWOULDBLOCK. */
+ if (str->chars_sans_newline >= str->pty_max_bytes)
+ {
+ Lstream_data_count retval2 = str->allow_quit ?
+ write_allowing_quit (str->fd, &str->eof_char, 1) :
+ write (str->fd, &str->eof_char, 1);
+
+ if (retval2 > 0)
+ str->chars_sans_newline = 0;
+ else if (retval2 < 0)
+ {
+ /* Error writing the EOF char. If nothing got written,
+ then treat this as an error -- either return an error
+ condition or set the blocking-error flag. */
+ if (retval == 0)
+ {
+ if (errno_would_block_p (errno) && str->blocked_ok)
+ {
+ str->blocking_error_p = 1;
+ return 0;
+ }
+ else
+ return retval2;
+ }
+ else
+ return retval;
+ }
+ }
+ }
+
+ /* The need_newline flag is necessary because otherwise when the
+ first byte is a newline, we'd get stuck never writing anything
+ in pty-flushing mode. */
+ if (need_newline)
+ {
+ Bufbyte nl = '\n';
+ Lstream_data_count retval2 = str->allow_quit ?
+ write_allowing_quit (str->fd, &nl, 1) :
+ write (str->fd, &nl, 1);
+
+ if (retval2 > 0)
+ {
+ str->chars_sans_newline = 0;
+ retval++;
+ }
+ else if (retval2 < 0)
+ {
+ /* Error writing the newline char. If nothing got written,
+ then treat this as an error -- either return an error
+ condition or set the blocking-error flag. */
+ if (retval == 0)
+ {
+ if (errno_would_block_p (errno) && str->blocked_ok)
+ {
+ str->blocking_error_p = 1;
+ return 0;
+ }
+ else
+ return retval2;
+ }
+ else
+ return retval;
+ }
+ }
+
+ return retval;
+}
+
+static int
+filedesc_rewinder (Lstream *stream)
+{
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ if (str->starting_pos < 0 ||
+ lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos,
+ SEEK_SET) == -1)
+ return -1;
+ else
+ {
+ str->current_pos = str->starting_pos;
+ return 0;
+ }
+}
+
+static int
+filedesc_seekable_p (Lstream *stream)
+{
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ if (str->starting_pos < 0)
+ return 0;
+ else
+ {
+ struct stat lestat;
+
+ if (fstat (str->fd, &lestat) < 0)
+ return 0;
+ return S_ISREG (lestat.st_mode);
+ }
+}
+
+static int
+filedesc_closer (Lstream *stream)
+{
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ if (str->closing)
+ return close (str->fd);
+ else
+ return 0;
+}
+
+static int
+filedesc_was_blocked_p (Lstream *stream)
+{
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ return str->blocking_error_p;
+}
+
+void
+filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes,
+ Bufbyte eof_char)
+{
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ str->pty_max_bytes = pty_max_bytes;
+ str->eof_char = eof_char;
+ str->pty_flushing = 1;
+}
+
+int
+filedesc_stream_fd (Lstream *stream)
+{
+ struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
+ return str->fd;
+}
+
+/*********** read from a Lisp string ***********/
+
+#define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string)
+
+struct lisp_string_stream
+{
+ Lisp_Object obj;
+ Bytecount init_offset;
+ Bytecount offset, end;
+};
+
+DEFINE_LSTREAM_IMPLEMENTATION ("lisp-string", lstream_lisp_string,
+ sizeof (struct lisp_string_stream));
+
+Lisp_Object
+make_lisp_string_input_stream (Lisp_Object string, Bytecount offset,
+ Bytecount len)
+{
+ Lisp_Object obj;
+ Lstream *lstr;
+ struct lisp_string_stream *str;
+
+ CHECK_STRING (string);
+ if (len < 0)
+ len = XSTRING_LENGTH (string) - offset;
+ assert (offset >= 0);
+ assert (len >= 0);
+ assert (offset + len <= XSTRING_LENGTH (string));
+
+ lstr = Lstream_new (lstream_lisp_string, "r");
+ str = LISP_STRING_STREAM_DATA (lstr);
+ str->offset = offset;
+ str->end = offset + len;
+ str->init_offset = offset;
+ str->obj = string;
+ XSETLSTREAM (obj, lstr);
+ return obj;
+}
+
+static Lstream_data_count
+lisp_string_reader (Lstream *stream, unsigned char *data,
+ Lstream_data_count size)
+{
+ struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
+ /* Don't lose if the string shrank past us ... */
+ Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj));
+ Bufbyte *strstart = XSTRING_DATA (str->obj);
+ Bufbyte *start = strstart + offset;
+
+ /* ... or if someone changed the string and we ended up in the
+ middle of a character. */
+ /* Being in the middle of a character is `normal' unless
+ LSTREAM_NO_PARTIAL_CHARS - mrb */
+ if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
+ VALIDATE_CHARPTR_BACKWARD (start);
+ offset = start - strstart;
+ size = min (size, (Lstream_data_count) (str->end - offset));
+ memcpy (data, start, size);
+ str->offset = offset + size;
+ return size;
+}
+
+static int
+lisp_string_rewinder (Lstream *stream)
+{
+ struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
+ int pos = str->init_offset;
+ if (pos > str->end)
+ pos = str->end;
+ /* Don't lose if the string shrank past us ... */
+ pos = min (pos, XSTRING_LENGTH (str->obj));
+ /* ... or if someone changed the string and we ended up in the
+ middle of a character. */
+ {
+ Bufbyte *strstart = XSTRING_DATA (str->obj);
+ Bufbyte *start = strstart + pos;
+ VALIDATE_CHARPTR_BACKWARD (start);
+ pos = start - strstart;
+ }
+ str->offset = pos;
+ return 0;
+}
+
+static Lisp_Object
+lisp_string_marker (Lisp_Object stream)
+{
+ struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream));
+ return str->obj;
+}
+
+/*********** a fixed buffer ***********/
+
+#define FIXED_BUFFER_STREAM_DATA(stream) \
+ LSTREAM_TYPE_DATA (stream, fixed_buffer)
+
+struct fixed_buffer_stream
+{
+ const unsigned char *inbuf;
+ unsigned char *outbuf;
+ Lstream_data_count size;
+ Lstream_data_count offset;
+};
+
+DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", lstream_fixed_buffer,
+ sizeof (struct fixed_buffer_stream));
+
+Lisp_Object
+make_fixed_buffer_input_stream (const void *buf, Lstream_data_count size)
+{
+ Lisp_Object obj;
+ Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r");
+ struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
+ str->inbuf = (const unsigned char *) buf;
+ str->size = size;
+ XSETLSTREAM (obj, lstr);
+ return obj;
+}
+
+Lisp_Object
+make_fixed_buffer_output_stream (void *buf, Lstream_data_count size)
+{
+ Lisp_Object obj;
+ Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w");
+ struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
+ str->outbuf = (unsigned char *) buf;
+ str->size = size;
+ XSETLSTREAM (obj, lstr);
+ return obj;
+}
+
+static Lstream_data_count
+fixed_buffer_reader (Lstream *stream, unsigned char *data,
+ Lstream_data_count size)
+{
+ struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
+ size = min (size, str->size - str->offset);
+ memcpy (data, str->inbuf + str->offset, size);
+ str->offset += size;
+ return size;
+}
+
+static Lstream_data_count
+fixed_buffer_writer (Lstream *stream, const unsigned char *data,
+ Lstream_data_count size)
+{
+ struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
+ if (str->offset == str->size)
+ {
+ /* If we're at the end, just throw away the data and pretend
+ we wrote all of it. If we return 0, then the lstream routines
+ will try again and again to write it out. */
+ return size;
+ }
+ size = min (size, str->size - str->offset);
+ memcpy (str->outbuf + str->offset, data, size);
+ str->offset += size;
+ return size;
+}
+
+static int
+fixed_buffer_rewinder (Lstream *stream)
+{
+ FIXED_BUFFER_STREAM_DATA (stream)->offset = 0;
+ return 0;
+}
+
+const unsigned char *
+fixed_buffer_input_stream_ptr (Lstream *stream)
+{
+ assert (stream->imp == lstream_fixed_buffer);
+ return FIXED_BUFFER_STREAM_DATA (stream)->inbuf;
+}
+
+unsigned char *
+fixed_buffer_output_stream_ptr (Lstream *stream)
+{
+ assert (stream->imp == lstream_fixed_buffer);
+ return FIXED_BUFFER_STREAM_DATA (stream)->outbuf;
+}
+
+/*********** write to a resizing buffer ***********/
+
+#define RESIZING_BUFFER_STREAM_DATA(stream) \
+ LSTREAM_TYPE_DATA (stream, resizing_buffer)
+
+struct resizing_buffer_stream
+{
+ unsigned char *buf;
+ Lstream_data_count allocked;
+ int max_stored;
+ int stored;
+};
+
+DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", lstream_resizing_buffer,
+ sizeof (struct resizing_buffer_stream));
+
+Lisp_Object
+make_resizing_buffer_output_stream (void)
+{
+ Lisp_Object obj;
+ XSETLSTREAM (obj, Lstream_new (lstream_resizing_buffer, "w"));
+ return obj;
+}
+
+static Lstream_data_count
+resizing_buffer_writer (Lstream *stream, const unsigned char *data,
+ Lstream_data_count size)
+{
+ struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
+ DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char);
+ memcpy (str->buf + str->stored, data, size);
+ str->stored += size;
+ str->max_stored = max (str->max_stored, str->stored);
+ return size;
+}
+
+static int
+resizing_buffer_rewinder (Lstream *stream)
+{
+ RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0;
+ return 0;
+}
+
+static int
+resizing_buffer_closer (Lstream *stream)
+{
+ struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
+ if (str->buf)
+ {
+ xfree (str->buf);
+ str->buf = 0;
+ }
+ return 0;
+}
+
+unsigned char *
+resizing_buffer_stream_ptr (Lstream *stream)
+{
+ return RESIZING_BUFFER_STREAM_DATA (stream)->buf;
+}
+
+/*********** write to an unsigned-char dynarr ***********/
+
+/* Note: If you have a dynarr whose type is not unsigned_char_dynarr
+ but which is really just an unsigned_char_dynarr (e.g. its type
+ is Bufbyte or Extbyte), just cast to unsigned_char_dynarr. */
+
+#define DYNARR_STREAM_DATA(stream) \
+ LSTREAM_TYPE_DATA (stream, dynarr)
+
+struct dynarr_stream
+{
+ unsigned_char_dynarr *dyn;
+};
+
+DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", lstream_dynarr,
+ sizeof (struct dynarr_stream));
+
+Lisp_Object
+make_dynarr_output_stream (unsigned_char_dynarr *dyn)
+{
+ Lisp_Object obj;
+ XSETLSTREAM (obj, Lstream_new (lstream_dynarr, "w"));
+ DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn;
+ return obj;
+}
+
+static Lstream_data_count
+dynarr_writer (Lstream *stream, const unsigned char *data,
+ Lstream_data_count size)
+{
+ struct dynarr_stream *str = DYNARR_STREAM_DATA (stream);
+ Dynarr_add_many (str->dyn, data, size);
+ return size;
+}
+
+static int
+dynarr_rewinder (Lstream *stream)
+{
+ Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn);
+ return 0;
+}
+
+static int
+dynarr_closer (Lstream *stream)
+{
+ return 0;
+}
+
+/************ read from or write to a Lisp buffer ************/
+
+/* Note: Lisp-buffer read streams never return partial characters,
+ and Lisp-buffer write streams expect to never get partial
+ characters. */
+
+#define LISP_BUFFER_STREAM_DATA(stream) \
+ LSTREAM_TYPE_DATA (stream, lisp_buffer)
+
+struct lisp_buffer_stream
+{
+ Lisp_Object buffer;
+ Lisp_Object orig_start;
+ /* we use markers to properly deal with insertion/deletion */
+ Lisp_Object start, end;
+ int flags;
+};
+
+DEFINE_LSTREAM_IMPLEMENTATION ("lisp-buffer", lstream_lisp_buffer,
+ sizeof (struct lisp_buffer_stream));
+
+static Lisp_Object
+make_lisp_buffer_stream_1 (struct buffer *buf, Bufpos start, Bufpos end,
+ int flags, const char *mode)
+{
+ Lisp_Object obj;
+ Lstream *lstr;
+ struct lisp_buffer_stream *str;
+ Bufpos bmin, bmax;
+ int reading = !strcmp (mode, "r");
+
+ /* Make sure the luser didn't pass "w" in. */
+ if (!strcmp (mode, "w"))
+ ABORT ();
+
+ if (flags & LSTR_IGNORE_ACCESSIBLE)
+ {
+ bmin = BUF_BEG (buf);
+ bmax = BUF_Z (buf);
+ }
+ else
+ {
+ bmin = BUF_BEGV (buf);
+ bmax = BUF_ZV (buf);
+ }
+
+ if (start == -1)
+ start = bmin;
+ if (end == -1)
+ end = bmax;
+ assert (bmin <= start);
+ assert (start <= bmax);
+ if (reading)
+ {
+ assert (bmin <= end);
+ assert (end <= bmax);
+ assert (start <= end);
+ }
+
+ lstr = Lstream_new (lstream_lisp_buffer, mode);
+ str = LISP_BUFFER_STREAM_DATA (lstr);
+ {
+ Lisp_Object marker;
+ Lisp_Object buffer;
+
+ XSETBUFFER (buffer, buf);
+ marker = Fmake_marker ();
+ Fset_marker (marker, make_int (start), buffer);
+ str->start = marker;
+ marker = Fmake_marker ();
+ Fset_marker (marker, make_int (start), buffer);
+ str->orig_start = marker;
+ if (reading)
+ {
+ marker = Fmake_marker ();
+ Fset_marker (marker, make_int (end), buffer);
+ str->end = marker;
+ }
+ else
+ str->end = Qnil;
+ str->buffer = buffer;
+ }
+ str->flags = flags;
+ XSETLSTREAM (obj, lstr);
+ return obj;
+}
+
+Lisp_Object
+make_lisp_buffer_input_stream (struct buffer *buf, Bufpos start, Bufpos end,
+ int flags)
+{
+ return make_lisp_buffer_stream_1 (buf, start, end, flags, "r");
+}
+
+Lisp_Object
+make_lisp_buffer_output_stream (struct buffer *buf, Bufpos pos, int flags)
+{
+ Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc");
+
+ Lstream_set_character_mode (XLSTREAM (lstr));
+ return lstr;
+}
+
+static Lstream_data_count
+lisp_buffer_reader (Lstream *stream, unsigned char *data,
+ Lstream_data_count size)
+{
+ struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
+ unsigned char *orig_data = data;
+ Bytind start;
+ Bytind end;
+ struct buffer *buf = XBUFFER (str->buffer);
+
+ if (!BUFFER_LIVE_P (buf))
+ return 0; /* Fut. */
+
+ /* NOTE: We do all our operations in Bytind's.
+ Keep in mind that SIZE is a value in bytes, not chars. */
+
+ start = bi_marker_position (str->start);
+ end = bi_marker_position (str->end);
+ if (!(str->flags & LSTR_IGNORE_ACCESSIBLE))
+ {
+ start = bytind_clip_to_bounds (BI_BUF_BEGV (buf), start,
+ BI_BUF_ZV (buf));
+ end = bytind_clip_to_bounds (BI_BUF_BEGV (buf), end,
+ BI_BUF_ZV (buf));
+ }
+
+ size = min (size, (Lstream_data_count) (end - start));
+ end = start + size;
+ /* We cannot return a partial character. */
+ VALIDATE_BYTIND_BACKWARD (buf, end);
+
+ while (start < end)
+ {
+ Bytind ceil;
+ Bytecount chunk;
+
+ if (str->flags & LSTR_IGNORE_ACCESSIBLE)
+ ceil = BI_BUF_CEILING_OF_IGNORE_ACCESSIBLE (buf, start);
+ else
+ ceil = BI_BUF_CEILING_OF (buf, start);
+ chunk = min (ceil, end) - start;
+ memcpy (data, BI_BUF_BYTE_ADDRESS (buf, start), chunk);
+ data += chunk;
+ start += chunk;
+ }
+
+ if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE)
+ {
+ /* What a kludge. What a kludge. What a kludge. */
+ unsigned char *p;
+ for (p = orig_data; p < data; p++)
+ if (*p == '\r')
+ *p = '\n';
+ }
+
+ set_bi_marker_position (str->start, end);
+ return data - orig_data;
+}
+
+static Lstream_data_count
+lisp_buffer_writer (Lstream *stream, const unsigned char *data,
+ Lstream_data_count size)
+{
+ struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
+ Bufpos pos;
+ struct buffer *buf = XBUFFER (str->buffer);
+
+ if (!BUFFER_LIVE_P (buf))
+ return 0; /* Fut. */
+
+ pos = marker_position (str->start);
+ pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0);
+ set_marker_position (str->start, pos);
+ return size;
+}
+
+static int
+lisp_buffer_rewinder (Lstream *stream)
+{
+ struct lisp_buffer_stream *str =
+ LISP_BUFFER_STREAM_DATA (stream);
+ struct buffer *buf = XBUFFER (str->buffer);
+ long pos = marker_position (str->orig_start);
+ if (!BUFFER_LIVE_P (buf))
+ return -1; /* Fut. */
+ if (pos > BUF_ZV (buf))
+ pos = BUF_ZV (buf);
+ if (pos < marker_position (str->orig_start))
+ pos = marker_position (str->orig_start);
+ if (MARKERP (str->end) && pos > marker_position (str->end))
+ pos = marker_position (str->end);
+ set_marker_position (str->start, pos);
+ return 0;
+}
+
+static Lisp_Object
+lisp_buffer_marker (Lisp_Object stream)
+{
+ struct lisp_buffer_stream *str =
+ LISP_BUFFER_STREAM_DATA (XLSTREAM (stream));
+
+ mark_object (str->start);
+ mark_object (str->end);
+ return str->buffer;
+}
+
+Bufpos
+lisp_buffer_stream_startpos (Lstream *stream)
+{
+ return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start);
+}
+
+\f
+/************************************************************************/
+/* initialization */
+/************************************************************************/
+
+void
+lstream_type_create (void)
+{
+ LSTREAM_HAS_METHOD (stdio, reader);
+ LSTREAM_HAS_METHOD (stdio, writer);
+ LSTREAM_HAS_METHOD (stdio, rewinder);
+ LSTREAM_HAS_METHOD (stdio, seekable_p);
+ LSTREAM_HAS_METHOD (stdio, flusher);
+ LSTREAM_HAS_METHOD (stdio, closer);
+
+ LSTREAM_HAS_METHOD (filedesc, reader);
+ LSTREAM_HAS_METHOD (filedesc, writer);
+ LSTREAM_HAS_METHOD (filedesc, was_blocked_p);
+ LSTREAM_HAS_METHOD (filedesc, rewinder);
+ LSTREAM_HAS_METHOD (filedesc, seekable_p);
+ LSTREAM_HAS_METHOD (filedesc, closer);
+
+ LSTREAM_HAS_METHOD (lisp_string, reader);
+ LSTREAM_HAS_METHOD (lisp_string, rewinder);
+ LSTREAM_HAS_METHOD (lisp_string, marker);
+
+ LSTREAM_HAS_METHOD (fixed_buffer, reader);
+ LSTREAM_HAS_METHOD (fixed_buffer, writer);
+ LSTREAM_HAS_METHOD (fixed_buffer, rewinder);
+
+ LSTREAM_HAS_METHOD (resizing_buffer, writer);
+ LSTREAM_HAS_METHOD (resizing_buffer, rewinder);
+ LSTREAM_HAS_METHOD (resizing_buffer, closer);
+
+ LSTREAM_HAS_METHOD (dynarr, writer);
+ LSTREAM_HAS_METHOD (dynarr, rewinder);
+ LSTREAM_HAS_METHOD (dynarr, closer);
+
+ LSTREAM_HAS_METHOD (lisp_buffer, reader);
+ LSTREAM_HAS_METHOD (lisp_buffer, writer);
+ LSTREAM_HAS_METHOD (lisp_buffer, rewinder);
+ LSTREAM_HAS_METHOD (lisp_buffer, marker);
+}
+
+void
+reinit_vars_of_lstream (void)
+{
+ int i;
+
+ for (i = 0; i < countof (Vlstream_free_list); i++)
+ {
+ Vlstream_free_list[i] = Qnil;
+ staticpro_nodump (&Vlstream_free_list[i]);
+ }
+}
+
+void
+vars_of_lstream (void)
+{
+ INIT_LRECORD_IMPLEMENTATION (lstream);
+
+ reinit_vars_of_lstream ();
+}
projects / chise / xemacs-chise.git- / blobdiff