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f6f4feb0a2
Conflicts: GUILE-VERSION libguile/array-map.c libguile/fports.h libguile/gc.h libguile/inline.h libguile/ports.c libguile/ports.h libguile/print.c libguile/r6rs-ports.c libguile/read.c test-suite/tests/00-socket.test
461 lines
17 KiB
C
461 lines
17 KiB
C
/* classes: h_files */
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#ifndef SCM_PORTS_H
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#define SCM_PORTS_H
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/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004,
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* 2006, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include "libguile/__scm.h"
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "libguile/gc.h"
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#include "libguile/tags.h"
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#include "libguile/error.h"
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#include "libguile/print.h"
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#include "libguile/struct.h"
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#include "libguile/threads.h"
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#include "libguile/strings.h"
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#define SCM_INITIAL_PUTBACK_BUF_SIZE 4
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/* values for the rw_active flag. */
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typedef enum scm_t_port_rw_active {
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SCM_PORT_NEITHER = 0,
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SCM_PORT_READ = 1,
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SCM_PORT_WRITE = 2
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} scm_t_port_rw_active;
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/* An internal-only structure defined in ports-internal.h. */
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struct scm_port_internal;
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/* C representation of a Scheme port. */
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typedef struct
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{
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SCM port; /* Link back to the port object. */
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scm_i_pthread_mutex_t *lock; /* A recursive lock for this port. */
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/* pointer to internal-only port structure */
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struct scm_port_internal *internal;
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/* data for the underlying port implementation as a raw C value. */
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scm_t_bits stream;
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SCM file_name; /* debugging support. */
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long line_number; /* debugging support. */
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int column_number; /* debugging support. */
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/* port buffers. the buffer(s) are set up for all ports.
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in the case of string ports, the buffer is the string itself.
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in the case of unbuffered file ports, the buffer is a
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single char: shortbuf. */
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/* this buffer is filled from read_buf to read_end using the ptob
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buffer_fill. then input requests are taken from read_pos until
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it reaches read_end. */
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unsigned char *read_buf; /* buffer start. */
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const unsigned char *read_pos;/* the next unread char. */
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unsigned char *read_end; /* pointer to last buffered char + 1. */
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scm_t_off read_buf_size; /* size of the buffer. */
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/* when chars are put back into the buffer, e.g., using peek-char or
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unread-string, the read-buffer pointers are switched to cbuf.
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the original pointers are saved here and restored when the put-back
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chars have been consumed. */
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unsigned char *saved_read_buf;
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const unsigned char *saved_read_pos;
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unsigned char *saved_read_end;
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scm_t_off saved_read_buf_size;
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/* write requests are saved into this buffer at write_pos until it
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reaches write_buf + write_buf_size, then the ptob flush is
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called. */
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unsigned char *write_buf; /* buffer start. */
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unsigned char *write_pos; /* pointer to last buffered char + 1. */
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unsigned char *write_end; /* pointer to end of buffer + 1. */
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scm_t_off write_buf_size; /* size of the buffer. */
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unsigned char shortbuf; /* buffer for "unbuffered" streams. */
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int rw_random; /* true if the port is random access.
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implies that the buffers must be
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flushed before switching between
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reading and writing, seeking, etc. */
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scm_t_port_rw_active rw_active; /* for random access ports,
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indicates which of the buffers
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is currently in use. can be
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SCM_PORT_WRITE, SCM_PORT_READ,
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or SCM_PORT_NEITHER. */
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/* a buffer for un-read chars and strings. */
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unsigned char *putback_buf;
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size_t putback_buf_size; /* allocated size of putback_buf. */
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/* Character encoding support */
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char *encoding;
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scm_t_string_failed_conversion_handler ilseq_handler;
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} scm_t_port;
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SCM_INTERNAL SCM scm_i_port_weak_set;
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#define SCM_READ_BUFFER_EMPTY_P(c_port) (c_port->read_pos >= c_port->read_end)
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#define SCM_EOF_OBJECT_P(x) (scm_is_eq ((x), SCM_EOF_VAL))
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/* PORT FLAGS
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* A set of flags characterizes a port.
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* Note that we reserve the bits 1 << 24 and above for use by the
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* routines in the port's scm_ptobfuns structure.
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*/
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#define SCM_OPN (1L<<16) /* Is the port open? */
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#define SCM_RDNG (2L<<16) /* Is it a readable port? */
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#define SCM_WRTNG (4L<<16) /* Is it writable? */
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#define SCM_BUF0 (8L<<16) /* Is it unbuffered? */
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#define SCM_BUFLINE (64L<<16) /* Is it line-buffered? */
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#define SCM_PORTP(x) (SCM_HAS_TYP7 (x, scm_tc7_port))
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#define SCM_OPPORTP(x) (SCM_PORTP (x) && (SCM_CELL_WORD_0 (x) & SCM_OPN))
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#define SCM_INPUT_PORT_P(x) (SCM_PORTP (x) && (SCM_CELL_WORD_0 (x) & SCM_RDNG))
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#define SCM_OUTPUT_PORT_P(x) (SCM_PORTP (x) && (SCM_CELL_WORD_0 (x) & SCM_WRTNG))
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#define SCM_OPINPORTP(x) (SCM_OPPORTP (x) && SCM_INPUT_PORT_P (x))
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#define SCM_OPOUTPORTP(x) (SCM_OPPORTP (x) && SCM_OUTPUT_PORT_P (x))
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#define SCM_OPENP(x) (SCM_OPPORTP (x))
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#define SCM_CLOSEDP(x) (!SCM_OPENP (x))
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#define SCM_CLR_PORT_OPEN_FLAG(p) \
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SCM_SET_CELL_WORD_0 ((p), SCM_CELL_WORD_0 (p) & ~SCM_OPN)
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#define SCM_PTAB_ENTRY(x) ((scm_t_port *) SCM_CELL_WORD_1 (x))
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#define SCM_PORT_DESCRIPTOR(port) ((scm_t_ptob_descriptor *) SCM_CELL_WORD_2 (port))
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#define SCM_SETPTAB_ENTRY(x, ent) (SCM_SET_CELL_WORD_1 ((x), (scm_t_bits) (ent)))
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#define SCM_STREAM(x) (SCM_PTAB_ENTRY(x)->stream)
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#define SCM_SETSTREAM(x, s) (SCM_PTAB_ENTRY(x)->stream = (scm_t_bits) (s))
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#define SCM_FILENAME(x) (SCM_PTAB_ENTRY(x)->file_name)
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#define SCM_SET_FILENAME(x, n) (SCM_PTAB_ENTRY(x)->file_name = (n))
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#define SCM_LINUM(x) (SCM_PTAB_ENTRY(x)->line_number)
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#define SCM_COL(x) (SCM_PTAB_ENTRY(x)->column_number)
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#define SCM_INCLINE(port) do {SCM_LINUM (port) += 1; SCM_COL (port) = 0;} while (0)
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#define SCM_ZEROCOL(port) do {SCM_COL (port) = 0;} while (0)
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#define SCM_INCCOL(port) do {SCM_COL (port) += 1;} while (0)
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#define SCM_DECCOL(port) do {if (SCM_COL (port) > 0) SCM_COL (port) -= 1;} while (0)
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#define SCM_TABCOL(port) do {SCM_COL (port) += 8 - SCM_COL (port) % 8;} while (0)
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/* Maximum number of port types. */
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#define SCM_I_MAX_PORT_TYPE_COUNT 256
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typedef enum scm_t_port_type_flags {
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SCM_PORT_TYPE_HAS_FLUSH = 1 << 0
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} scm_t_port_type_flags;
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/* port-type description. */
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typedef struct scm_t_ptob_descriptor
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{
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char *name;
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SCM (*mark) (SCM);
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size_t (*free) (SCM);
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int (*print) (SCM exp, SCM port, scm_print_state *pstate);
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SCM (*equalp) (SCM, SCM);
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int (*close) (SCM port);
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void (*write) (SCM port, const void *data, size_t size);
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void (*flush) (SCM port);
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void (*end_input) (SCM port, int offset);
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int (*fill_input) (SCM port);
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int (*input_waiting) (SCM port);
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scm_t_off (*seek) (SCM port, scm_t_off OFFSET, int WHENCE);
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void (*truncate) (SCM port, scm_t_off length);
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unsigned flags;
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} scm_t_ptob_descriptor;
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#define SCM_TC2PTOBNUM(x) (0x0ff & ((x) >> 8))
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#define SCM_PTOBNUM(x) (SCM_TC2PTOBNUM (SCM_CELL_TYPE (x)))
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/* SCM_PTOBNAME can be 0 if name is missing */
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#define SCM_PTOBNAME(ptobnum) (scm_c_port_type_ref (ptobnum)->name)
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/* Port types, and their vtables. */
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SCM_INTERNAL long scm_c_num_port_types (void);
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SCM_API scm_t_ptob_descriptor* scm_c_port_type_ref (long ptobnum);
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SCM_API long scm_c_port_type_add_x (scm_t_ptob_descriptor *desc);
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SCM_API scm_t_bits scm_make_port_type (char *name,
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int (*fill_input) (SCM port),
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void (*write) (SCM port,
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const void *data,
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size_t size));
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SCM_API void scm_set_port_mark (scm_t_bits tc, SCM (*mark) (SCM));
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SCM_API void scm_set_port_free (scm_t_bits tc, size_t (*free) (SCM));
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SCM_API void scm_set_port_print (scm_t_bits tc,
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int (*print) (SCM exp,
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SCM port,
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scm_print_state *pstate));
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SCM_API void scm_set_port_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM));
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SCM_API void scm_set_port_close (scm_t_bits tc, int (*close) (SCM));
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SCM_API void scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port));
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SCM_API void scm_set_port_end_input (scm_t_bits tc,
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void (*end_input) (SCM port,
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int offset));
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SCM_API void scm_set_port_seek (scm_t_bits tc,
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scm_t_off (*seek) (SCM port,
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scm_t_off OFFSET,
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int WHENCE));
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SCM_API void scm_set_port_truncate (scm_t_bits tc,
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void (*truncate) (SCM port,
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scm_t_off length));
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SCM_API void scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM));
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/* The input, output, error, and load ports. */
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SCM_API SCM scm_current_input_port (void);
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SCM_API SCM scm_current_output_port (void);
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SCM_API SCM scm_current_error_port (void);
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SCM_API SCM scm_current_warning_port (void);
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SCM_API SCM scm_current_load_port (void);
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SCM_API SCM scm_set_current_input_port (SCM port);
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SCM_API SCM scm_set_current_output_port (SCM port);
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SCM_API SCM scm_set_current_error_port (SCM port);
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SCM_API SCM scm_set_current_warning_port (SCM port);
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SCM_API void scm_dynwind_current_input_port (SCM port);
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SCM_API void scm_dynwind_current_output_port (SCM port);
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SCM_API void scm_dynwind_current_error_port (SCM port);
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SCM_INTERNAL void scm_i_dynwind_current_load_port (SCM port);
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/* Mode bits. */
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SCM_INTERNAL long scm_i_mode_bits (SCM modes);
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SCM_API long scm_mode_bits (char *modes);
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SCM_API SCM scm_port_mode (SCM port);
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/* Low-level constructors. */
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SCM_API SCM
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scm_c_make_port_with_encoding (scm_t_bits tag,
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unsigned long mode_bits,
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const char *encoding,
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scm_t_string_failed_conversion_handler handler,
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scm_t_bits stream);
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SCM_API SCM scm_c_make_port (scm_t_bits tag, unsigned long mode_bits,
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scm_t_bits stream);
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SCM_API SCM scm_new_port_table_entry (scm_t_bits tag);
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/* Predicates. */
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SCM_API SCM scm_port_p (SCM x);
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SCM_API SCM scm_input_port_p (SCM x);
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SCM_API SCM scm_output_port_p (SCM x);
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SCM_API SCM scm_port_closed_p (SCM port);
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SCM_API SCM scm_eof_object_p (SCM x);
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/* Closing ports. */
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SCM_API SCM scm_close_port (SCM port);
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SCM_API SCM scm_close_input_port (SCM port);
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SCM_API SCM scm_close_output_port (SCM port);
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/* Encoding characters to byte streams, and decoding byte streams to
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characters. */
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SCM_INTERNAL const char *scm_i_default_port_encoding (void);
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SCM_INTERNAL void scm_i_set_default_port_encoding (const char *);
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SCM_INTERNAL scm_t_string_failed_conversion_handler
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scm_i_default_port_conversion_handler (void);
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SCM_INTERNAL void
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scm_i_set_default_port_conversion_handler (scm_t_string_failed_conversion_handler);
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SCM_INTERNAL void scm_i_set_port_encoding_x (SCM port, const char *str);
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SCM_API SCM scm_port_encoding (SCM port);
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SCM_API SCM scm_set_port_encoding_x (SCM port, SCM encoding);
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SCM_API SCM scm_port_conversion_strategy (SCM port);
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SCM_API SCM scm_set_port_conversion_strategy_x (SCM port, SCM behavior);
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/* Acquiring and releasing the port lock. */
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SCM_API void scm_dynwind_lock_port (SCM port);
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SCM_INLINE int scm_c_lock_port (SCM port, scm_i_pthread_mutex_t **lock);
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SCM_INLINE int scm_c_try_lock_port (SCM port, scm_i_pthread_mutex_t **lock);
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/* Input. */
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SCM_API int scm_get_byte_or_eof (SCM port);
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SCM_INLINE int scm_get_byte_or_eof_unlocked (SCM port);
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SCM_API int scm_slow_get_byte_or_eof_unlocked (SCM port);
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SCM_API int scm_peek_byte_or_eof (SCM port);
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SCM_INLINE int scm_peek_byte_or_eof_unlocked (SCM port);
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SCM_API int scm_slow_peek_byte_or_eof_unlocked (SCM port);
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SCM_API size_t scm_c_read (SCM port, void *buffer, size_t size);
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SCM_API size_t scm_c_read_unlocked (SCM port, void *buffer, size_t size);
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SCM_API scm_t_wchar scm_getc (SCM port);
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SCM_API scm_t_wchar scm_getc_unlocked (SCM port);
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SCM_API SCM scm_read_char (SCM port);
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/* Pushback. */
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SCM_API void scm_unget_bytes (const unsigned char *buf, size_t len, SCM port);
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SCM_API void scm_unget_bytes_unlocked (const unsigned char *buf, size_t len, SCM port);
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SCM_API void scm_unget_byte (int c, SCM port);
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SCM_API void scm_unget_byte_unlocked (int c, SCM port);
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SCM_API void scm_ungetc (scm_t_wchar c, SCM port);
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SCM_API void scm_ungetc_unlocked (scm_t_wchar c, SCM port);
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SCM_API void scm_ungets (const char *s, int n, SCM port);
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SCM_API void scm_ungets_unlocked (const char *s, int n, SCM port);
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SCM_API SCM scm_peek_char (SCM port);
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SCM_API SCM scm_unread_char (SCM cobj, SCM port);
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SCM_API SCM scm_unread_string (SCM str, SCM port);
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/* Manipulating the buffers. */
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SCM_API void scm_port_non_buffer (scm_t_port *pt);
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SCM_API int scm_fill_input (SCM port);
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SCM_API int scm_fill_input_unlocked (SCM port);
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SCM_INTERNAL size_t scm_take_from_input_buffers (SCM port, char *dest, size_t read_len);
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SCM_API SCM scm_drain_input (SCM port);
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SCM_API void scm_end_input (SCM port);
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SCM_API void scm_end_input_unlocked (SCM port);
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SCM_API SCM scm_force_output (SCM port);
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SCM_API void scm_flush (SCM port);
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SCM_API void scm_flush_unlocked (SCM port);
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/* Output. */
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SCM_API void scm_putc (char c, SCM port);
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SCM_INLINE void scm_putc_unlocked (char c, SCM port);
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SCM_API void scm_puts (const char *str_data, SCM port);
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SCM_INLINE void scm_puts_unlocked (const char *str_data, SCM port);
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SCM_API void scm_c_write (SCM port, const void *buffer, size_t size);
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SCM_API void scm_c_write_unlocked (SCM port, const void *buffer, size_t size);
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SCM_API void scm_lfwrite (const char *ptr, size_t size, SCM port);
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SCM_API void scm_lfwrite_unlocked (const char *ptr, size_t size, SCM port);
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SCM_INTERNAL void scm_lfwrite_substr (SCM str, size_t start, size_t end,
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SCM port);
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/* Querying and setting positions, and character availability. */
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SCM_API SCM scm_char_ready_p (SCM port);
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SCM_API SCM scm_seek (SCM object, SCM offset, SCM whence);
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SCM_API SCM scm_truncate_file (SCM object, SCM length);
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SCM_API SCM scm_port_line (SCM port);
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SCM_API SCM scm_set_port_line_x (SCM port, SCM line);
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SCM_API SCM scm_port_column (SCM port);
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SCM_API SCM scm_set_port_column_x (SCM port, SCM line);
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SCM_API SCM scm_port_filename (SCM port);
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SCM_API SCM scm_set_port_filename_x (SCM port, SCM filename);
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/* Port alist. */
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SCM_INTERNAL SCM scm_i_port_alist (SCM port);
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SCM_INTERNAL void scm_i_set_port_alist_x (SCM port, SCM alist);
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/* Implementation helpers for port printing functions. */
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SCM_API int scm_port_print (SCM exp, SCM port, scm_print_state *);
|
||
SCM_API void scm_print_port_mode (SCM exp, SCM port);
|
||
|
||
/* Iterating over all ports. */
|
||
SCM_API SCM scm_port_for_each (SCM proc);
|
||
SCM_API void scm_c_port_for_each (void (*proc)(void *data, SCM p), void *data);
|
||
SCM_API SCM scm_flush_all_ports (void);
|
||
|
||
/* Void ports. */
|
||
SCM_API SCM scm_void_port (char * mode_str);
|
||
SCM_API SCM scm_sys_make_void_port (SCM mode);
|
||
|
||
/* Initialization. */
|
||
SCM_INTERNAL void scm_init_ports (void);
|
||
|
||
|
||
/* Inline function implementations. */
|
||
|
||
#if SCM_CAN_INLINE || defined SCM_INLINE_C_IMPLEMENTING_INLINES
|
||
SCM_INLINE_IMPLEMENTATION int
|
||
scm_c_lock_port (SCM port, scm_i_pthread_mutex_t **lock)
|
||
{
|
||
*lock = SCM_PTAB_ENTRY (port)->lock;
|
||
|
||
if (*lock)
|
||
return scm_i_pthread_mutex_lock (*lock);
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
SCM_INLINE_IMPLEMENTATION int
|
||
scm_c_try_lock_port (SCM port, scm_i_pthread_mutex_t **lock)
|
||
{
|
||
*lock = SCM_PTAB_ENTRY (port)->lock;
|
||
if (*lock)
|
||
{
|
||
int ret = scm_i_pthread_mutex_trylock (*lock);
|
||
if (ret != 0)
|
||
*lock = NULL;
|
||
return ret;
|
||
}
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
SCM_INLINE_IMPLEMENTATION int
|
||
scm_get_byte_or_eof_unlocked (SCM port)
|
||
{
|
||
scm_t_port *pt = SCM_PTAB_ENTRY (port);
|
||
|
||
if (SCM_LIKELY ((pt->rw_active == SCM_PORT_READ || !pt->rw_random)
|
||
&& pt->read_pos < pt->read_end))
|
||
return *pt->read_pos++;
|
||
else
|
||
return scm_slow_get_byte_or_eof_unlocked (port);
|
||
}
|
||
|
||
/* Like `scm_get_byte_or_eof' but does not change PORT's `read_pos'. */
|
||
SCM_INLINE_IMPLEMENTATION int
|
||
scm_peek_byte_or_eof_unlocked (SCM port)
|
||
{
|
||
scm_t_port *pt = SCM_PTAB_ENTRY (port);
|
||
|
||
if (SCM_LIKELY ((pt->rw_active == SCM_PORT_READ || !pt->rw_random)
|
||
&& pt->read_pos < pt->read_end))
|
||
return *pt->read_pos;
|
||
else
|
||
return scm_slow_peek_byte_or_eof_unlocked (port);
|
||
}
|
||
|
||
SCM_INLINE_IMPLEMENTATION void
|
||
scm_putc_unlocked (char c, SCM port)
|
||
{
|
||
SCM_ASSERT_TYPE (SCM_OPOUTPORTP (port), port, 0, NULL, "output port");
|
||
scm_lfwrite_unlocked (&c, 1, port);
|
||
}
|
||
|
||
SCM_INLINE_IMPLEMENTATION void
|
||
scm_puts_unlocked (const char *s, SCM port)
|
||
{
|
||
SCM_ASSERT_TYPE (SCM_OPOUTPORTP (port), port, 0, NULL, "output port");
|
||
scm_lfwrite_unlocked (s, strlen (s), port);
|
||
}
|
||
#endif /* SCM_CAN_INLINE || defined SCM_INLINE_C_IMPLEMENTING_INLINES */
|
||
|
||
#endif /* SCM_PORTS_H */
|
||
|
||
/*
|
||
Local Variables:
|
||
c-file-style: "gnu"
|
||
End:
|
||
*/
|