-/* Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1998,1999,2000,2001,2002 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
+
+
\f
+#include "libguile/_scm.h"
+
#include <stdio.h>
-#include "_scm.h"
-#include "unif.h"
-#include "eval.h"
-#include "read.h"
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "libguile/unif.h"
+#include "libguile/eval.h"
+#include "libguile/ports.h"
+#include "libguile/read.h"
+#include "libguile/root.h"
+#include "libguile/strings.h"
+#include "libguile/modules.h"
+#include "libguile/validate.h"
+#include "libguile/deprecation.h"
-#include "strports.h"
+#include "libguile/strports.h"
#ifdef HAVE_STRING_H
#include <string.h>
*
*/
+/* NOTES:
+ write_buf/write_end point to the ends of the allocated string.
+ read_buf/read_end in principle point to the part of the string which
+ has been written to, but this is only updated after a flush.
+ read_pos and write_pos in principle should be equal, but this is only true
+ when rw_active is SCM_PORT_NEITHER.
+*/
+
+scm_t_bits scm_tc16_strport;
-static int
-prinstpt (SCM exp, SCM port, scm_print_state *pstate)
-{
- scm_prinport (exp, port, "string");
- return !0;
-}
static int
stfill_buffer (SCM port)
{
- SCM str = SCM_STREAM (port);
- struct scm_port_table *pt = SCM_PTAB_ENTRY (port);
+ scm_t_port *pt = SCM_PTAB_ENTRY (port);
- pt->read_buf = SCM_ROCHARS (str);
- pt->read_buf_size = SCM_ROLENGTH (str);
- pt->read_end = pt->read_buf + pt->read_buf_size;
-
if (pt->read_pos >= pt->read_end)
return EOF;
else
- return scm_return_first (*(pt->read_pos++), port);
+ return scm_return_first_int (*pt->read_pos, port);
+}
+
+/* change the size of a port's string to new_size. this doesn't
+ change read_buf_size. */
+static void
+st_resize_port (scm_t_port *pt, off_t new_size)
+{
+ SCM old_stream = SCM_PACK (pt->stream);
+ SCM new_stream = scm_allocate_string (new_size);
+ unsigned long int old_size = SCM_STRING_LENGTH (old_stream);
+ unsigned long int min_size = min (old_size, new_size);
+ unsigned long int i;
+
+ off_t index = pt->write_pos - pt->write_buf;
+
+ pt->write_buf_size = new_size;
+
+ for (i = 0; i != min_size; ++i)
+ SCM_STRING_CHARS (new_stream) [i] = SCM_STRING_CHARS (old_stream) [i];
+
+ /* reset buffer. */
+ {
+ pt->stream = SCM_UNPACK (new_stream);
+ pt->read_buf = pt->write_buf = SCM_STRING_UCHARS (new_stream);
+ pt->read_pos = pt->write_pos = pt->write_buf + index;
+ pt->write_end = pt->write_buf + pt->write_buf_size;
+ pt->read_end = pt->read_buf + pt->read_buf_size;
+ }
}
-/* not a conventional "flush": it extends the string for more data. */
+/* amount by which write_buf is expanded. */
+#define SCM_WRITE_BLOCK 80
+
+/* ensure that write_pos < write_end by enlarging the buffer when
+ necessary. update read_buf to account for written chars. */
static void
st_flush (SCM port)
{
- struct scm_port_table *pt = SCM_PTAB_ENTRY (port);
+ scm_t_port *pt = SCM_PTAB_ENTRY (port);
if (pt->write_pos == pt->write_end)
{
- pt->write_buf_size += pt->write_buf_size >> 1;
- scm_vector_set_length_x (pt->stream,
- SCM_MAKINUM (pt->write_buf_size));
- /* reset buffer in case reallocation moved the string. */
- {
- int read = pt->read_pos - pt->read_buf;
- int written = pt->write_pos - pt->write_buf;
-
- pt->read_buf = pt->write_buf = SCM_CHARS (pt->stream);
- pt->read_pos = pt->read_buf + read;
- pt->write_pos = pt->write_buf + written;
- pt->write_end = pt->write_buf + pt->write_buf_size;
- pt->read_end = pt->read_buf + pt->read_buf_size;
- }
+ st_resize_port (pt, pt->write_buf_size + SCM_WRITE_BLOCK);
+ }
+ pt->read_pos = pt->write_pos;
+ if (pt->read_pos > pt->read_end)
+ {
+ pt->read_end = (unsigned char *) pt->read_pos;
+ pt->read_buf_size = pt->read_end - pt->read_buf;
}
+ pt->rw_active = SCM_PORT_NEITHER;
}
-SCM
-scm_mkstrport (pos, str, modes, caller)
- SCM pos;
- SCM str;
- long modes;
- const char * caller;
+static void
+st_write (SCM port, const void *data, size_t size)
{
- SCM z;
- SCM stream;
- struct scm_port_table * pt;
+ scm_t_port *pt = SCM_PTAB_ENTRY (port);
+ const char *input = (char *) data;
- SCM_ASSERT(SCM_INUMP(pos) && SCM_INUM(pos) >= 0, pos, SCM_ARG1, caller);
- SCM_ASSERT(SCM_NIMP(str) && SCM_ROSTRINGP(str), str, SCM_ARG1, caller);
- stream = str;
- SCM_NEWCELL (z);
- SCM_DEFER_INTS;
- pt = scm_add_to_port_table (z);
- SCM_SETCAR (z, scm_tc16_strport | modes);
- SCM_SETPTAB_ENTRY (z, pt);
- SCM_SETSTREAM (z, stream);
- pt->write_buf = pt->read_buf = SCM_ROCHARS (str);
- pt->write_pos = pt->read_pos = pt->read_buf + SCM_INUM (pos);
- pt->read_buf_size = SCM_ROLENGTH (str);
- pt->read_end = pt->read_buf + pt->read_buf_size;
- /* after the last (normally NUL) character is written to,
- the port will be "flushed". */
- pt->write_buf_size = pt->read_buf_size + 1;
- pt->write_end = pt->write_buf + pt->write_buf_size;
- SCM_ALLOW_INTS;
- return z;
+ while (size > 0)
+ {
+ int space = pt->write_end - pt->write_pos;
+ int write_len = (size > space) ? space : size;
+
+ memcpy ((char *) pt->write_pos, input, write_len);
+ pt->write_pos += write_len;
+ size -= write_len;
+ input += write_len;
+ if (write_len == space)
+ st_flush (port);
+ }
}
-SCM_PROC(s_call_with_output_string, "call-with-output-string", 1, 0, 0, scm_call_with_output_string);
+static void
+st_end_input (SCM port, int offset)
+{
+ scm_t_port *pt = SCM_PTAB_ENTRY (port);
+
+ if (pt->read_pos - pt->read_buf < offset)
+ scm_misc_error ("st_end_input", "negative position", SCM_EOL);
+
+ pt->write_pos = (unsigned char *) (pt->read_pos = pt->read_pos - offset);
+ pt->rw_active = SCM_PORT_NEITHER;
+}
-SCM
-scm_call_with_output_string (proc)
- SCM proc;
+static off_t
+st_seek (SCM port, off_t offset, int whence)
{
- SCM p;
- p = scm_mkstrport(SCM_INUM0, scm_make_string(SCM_MAKINUM(30), SCM_UNDEFINED),
- SCM_OPN | SCM_WRTNG,
- s_call_with_output_string);
- scm_apply (proc, p, scm_listofnull);
- {
- SCM answer;
- struct scm_port_table *pt = SCM_PTAB_ENTRY (p);
+ scm_t_port *pt = SCM_PTAB_ENTRY (port);
+ off_t target;
- answer = scm_makfromstr (SCM_CHARS (SCM_STREAM (p)),
- pt->write_pos - pt->write_buf,
- 0);
- return answer;
- }
+ if (pt->rw_active == SCM_PORT_READ && offset == 0 && whence == SEEK_CUR)
+ /* special case to avoid disturbing the unread-char buffer. */
+ {
+ if (pt->read_buf == pt->putback_buf)
+ {
+ target = pt->saved_read_pos - pt->saved_read_buf
+ - (pt->read_end - pt->read_pos);
+ }
+ else
+ {
+ target = pt->read_pos - pt->read_buf;
+ }
+ }
+ else
+ /* all other cases. */
+ {
+ if (pt->rw_active == SCM_PORT_WRITE)
+ st_flush (port);
+
+ if (pt->rw_active == SCM_PORT_READ)
+ scm_end_input (port);
+
+ switch (whence)
+ {
+ case SEEK_CUR:
+ target = pt->read_pos - pt->read_buf + offset;
+ break;
+ case SEEK_END:
+ target = pt->read_end - pt->read_buf + offset;
+ break;
+ default: /* SEEK_SET */
+ target = offset;
+ break;
+ }
+
+ if (target < 0)
+ scm_misc_error ("st_seek", "negative offset", SCM_EOL);
+
+ if (target >= pt->write_buf_size)
+ {
+ if (!(SCM_CELL_WORD_0 (port) & SCM_WRTNG))
+ {
+ if (target > pt->write_buf_size)
+ {
+ scm_misc_error ("st_seek",
+ "seek past end of read-only strport",
+ SCM_EOL);
+ }
+ }
+ else
+ {
+ st_resize_port (pt, target + (target == pt->write_buf_size
+ ? SCM_WRITE_BLOCK
+ : 0));
+ }
+ }
+ pt->read_pos = pt->write_pos = pt->read_buf + target;
+ if (pt->read_pos > pt->read_end)
+ {
+ pt->read_end = (unsigned char *) pt->read_pos;
+ pt->read_buf_size = pt->read_end - pt->read_buf;
+ }
+ }
+ return target;
+}
+
+static void
+st_truncate (SCM port, off_t length)
+{
+ scm_t_port *pt = SCM_PTAB_ENTRY (port);
+
+ if (length > pt->write_buf_size)
+ st_resize_port (pt, length);
+
+ pt->read_buf_size = length;
+ pt->read_end = pt->read_buf + length;
+ if (pt->read_pos > pt->read_end)
+ pt->read_pos = pt->read_end;
+
+ if (pt->write_pos > pt->read_end)
+ pt->write_pos = pt->read_end;
}
+SCM
+scm_mkstrport (SCM pos, SCM str, long modes, const char *caller)
+{
+ SCM z;
+ scm_t_port *pt;
+ size_t str_len;
+ SCM_ASSERT (SCM_INUMP(pos) && SCM_INUM(pos) >= 0, pos, SCM_ARG1, caller);
+ SCM_ASSERT (SCM_STRINGP (str), str, SCM_ARG1, caller);
+ str_len = SCM_STRING_LENGTH (str);
+ if (SCM_INUM (pos) > str_len)
+ scm_out_of_range (caller, pos);
+ if (!((modes & SCM_WRTNG) || (modes & SCM_RDNG)))
+ scm_misc_error ("scm_mkstrport", "port must read or write", SCM_EOL);
-/* Return a Scheme string obtained by printing a given object.
- */
+ SCM_DEFER_INTS;
+ z = scm_new_port_table_entry (scm_tc16_strport);
+ pt = SCM_PTAB_ENTRY(z);
+ SCM_SETSTREAM (z, SCM_UNPACK (str));
+ SCM_SET_CELL_TYPE(z, scm_tc16_strport|modes);
+ pt->write_buf = pt->read_buf = SCM_STRING_UCHARS (str);
+ pt->read_pos = pt->write_pos = pt->read_buf + SCM_INUM (pos);
+ pt->write_buf_size = pt->read_buf_size = str_len;
+ pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size;
+ pt->rw_random = 1;
-SCM
-scm_strprint_obj (obj)
- SCM obj;
+ SCM_ALLOW_INTS;
+
+ /* ensure write_pos is writable. */
+ if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end)
+ st_flush (z);
+ return z;
+}
+
+/* create a new string from a string port's buffer. */
+SCM scm_strport_to_string (SCM port)
{
+ scm_t_port *pt = SCM_PTAB_ENTRY (port);
SCM str;
- SCM port;
- str = scm_makstr (64, 0);
- port = scm_mkstrport (SCM_MAKINUM (0), str, SCM_OPN | SCM_WRTNG, "scm_strprint_obj");
- scm_prin1 (obj, port, 1);
- {
- struct scm_port_table *pt = SCM_PTAB_ENTRY (obj);
- SCM answer;
+ if (pt->rw_active == SCM_PORT_WRITE)
+ st_flush (port);
- answer = scm_makfromstr (SCM_CHARS (SCM_STREAM (port)),
- pt->write_pos - pt->write_buf,
- 0);
- return answer;
- }
+ str = scm_mem2string ((char *) pt->read_buf, pt->read_buf_size);
+ scm_remember_upto_here_1 (port);
+ return str;
}
+SCM_DEFINE (scm_object_to_string, "object->string", 1, 1, 0,
+ (SCM obj, SCM printer),
+ "Return a Scheme string obtained by printing @var{obj}.\n"
+ "Printing function can be specified by the optional second\n"
+ "argument @var{printer} (default: @code{write}).")
+#define FUNC_NAME s_scm_object_to_string
+{
+ SCM str, port;
+ if (!SCM_UNBNDP (printer))
+ SCM_VALIDATE_PROC (2, printer);
+ str = scm_allocate_string (0);
+ port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, FUNC_NAME);
-SCM_PROC(s_call_with_input_string, "call-with-input-string", 2, 0, 0, scm_call_with_input_string);
+ if (SCM_UNBNDP (printer))
+ scm_write (obj, port);
+ else
+ scm_call_2 (printer, obj, port);
-SCM
-scm_call_with_input_string (str, proc)
- SCM str;
- SCM proc;
+ return scm_strport_to_string (port);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_call_with_output_string, "call-with-output-string", 1, 0, 0,
+ (SCM proc),
+ "Calls the one-argument procedure @var{proc} with a newly created output\n"
+ "port. When the function returns, the string composed of the characters\n"
+ "written into the port is returned.")
+#define FUNC_NAME s_scm_call_with_output_string
{
- SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, s_call_with_input_string);
- return scm_apply (proc, p, scm_listofnull);
+ SCM p;
+
+ p = scm_mkstrport (SCM_INUM0,
+ scm_make_string (SCM_INUM0, SCM_UNDEFINED),
+ SCM_OPN | SCM_WRTNG,
+ FUNC_NAME);
+ scm_call_1 (proc, p);
+
+ return scm_strport_to_string (p);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_call_with_input_string, "call-with-input-string", 2, 0, 0,
+ (SCM string, SCM proc),
+ "Calls the one-argument procedure @var{proc} with a newly\n"
+ "created input port from which @var{string}'s contents may be\n"
+ "read. The value yielded by the @var{proc} is returned.")
+#define FUNC_NAME s_scm_call_with_input_string
+{
+ SCM p = scm_mkstrport(SCM_INUM0, string, SCM_OPN | SCM_RDNG, FUNC_NAME);
+ return scm_call_1 (proc, p);
}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_open_input_string, "open-input-string", 1, 0, 0,
+ (SCM str),
+ "Take a string and return an input port that delivers characters\n"
+ "from the string. The port can be closed by\n"
+ "@code{close-input-port}, though its storage will be reclaimed\n"
+ "by the garbage collector if it becomes inaccessible.")
+#define FUNC_NAME s_scm_open_input_string
+{
+ SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, FUNC_NAME);
+ return p;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_open_output_string, "open-output-string", 0, 0, 0,
+ (void),
+ "Return an output port that will accumulate characters for\n"
+ "retrieval by @code{get-output-string}. The port can be closed\n"
+ "by the procedure @code{close-output-port}, though its storage\n"
+ "will be reclaimed by the garbage collector if it becomes\n"
+ "inaccessible.")
+#define FUNC_NAME s_scm_open_output_string
+{
+ SCM p;
+ p = scm_mkstrport (SCM_INUM0,
+ scm_make_string (SCM_INUM0, SCM_UNDEFINED),
+ SCM_OPN | SCM_WRTNG,
+ FUNC_NAME);
+ return p;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_get_output_string, "get-output-string", 1, 0, 0,
+ (SCM port),
+ "Given an output port created by @code{open-output-string},\n"
+ "return a string consisting of the characters that have been\n"
+ "output to the port so far.")
+#define FUNC_NAME s_scm_get_output_string
+{
+ SCM_VALIDATE_OPOUTSTRPORT (1, port);
+ return scm_strport_to_string (port);
+}
+#undef FUNC_NAME
/* Given a null-terminated string EXPR containing a Scheme expression
read it, and return it as an SCM value. */
SCM
-scm_read_0str (expr)
- char *expr;
+scm_c_read_string (const char *expr)
{
- SCM port = scm_mkstrport (SCM_MAKINUM (0),
+ SCM port = scm_mkstrport (SCM_INUM0,
scm_makfrom0str (expr),
SCM_OPN | SCM_RDNG,
- "scm_eval_0str");
+ "scm_c_read_string");
SCM form;
/* Read expressions from that port; ignore the values. */
/* Given a null-terminated string EXPR containing Scheme program text,
evaluate it, and return the result of the last expression evaluated. */
SCM
-scm_eval_0str (expr)
- char *expr;
+scm_c_eval_string (const char *expr)
{
return scm_eval_string (scm_makfrom0str (expr));
}
+SCM
+scm_c_eval_string_in_module (const char *expr, SCM module)
+{
+ return scm_eval_string_in_module (scm_makfrom0str (expr), module);
+}
-SCM_PROC (s_eval_string, "eval-string", 1, 0, 0, scm_eval_string);
-SCM
-scm_eval_string (string)
- SCM string;
+static SCM
+inner_eval_string (void *data)
{
- SCM port = scm_mkstrport (SCM_MAKINUM (0), string, SCM_OPN | SCM_RDNG,
- "scm_eval_0str");
+ SCM port = (SCM)data;
SCM form;
SCM ans = SCM_UNSPECIFIED;
/* Read expressions from that port; ignore the values. */
while (!SCM_EOF_OBJECT_P (form = scm_read (port)))
- ans = scm_eval_x (form);
+ ans = scm_primitive_eval_x (form);
/* Don't close the port here; if we re-enter this function via a
continuation, then the next time we enter it, we'll get an error.
return ans;
}
-
-
-static int noop0 SCM_P ((SCM stream));
-
-static int
-noop0 (stream)
- SCM stream;
+SCM_DEFINE (scm_eval_string_in_module, "eval-string", 1, 1, 0,
+ (SCM string, SCM module),
+ "Evaluate @var{string} as the text representation of a Scheme\n"
+ "form or forms, and return whatever value they produce.\n"
+ "Evaluation takes place in the given module, or the current\n"
+ "module when no module is given.\n"
+ "While the code is evaluated, the given module is made the\n"
+ "current one. The current module is restored when this\n"
+ "procedure returns.")
+#define FUNC_NAME s_scm_eval_string_in_module
{
- return 0;
+ SCM port = scm_mkstrport (SCM_INUM0, string, SCM_OPN | SCM_RDNG,
+ FUNC_NAME);
+ if (SCM_UNBNDP (module))
+ module = scm_current_module ();
+ return scm_c_call_with_current_module (module,
+ inner_eval_string, (void *)port);
}
+#undef FUNC_NAME
+SCM
+scm_eval_string (SCM string)
+{
+ return scm_eval_string_in_module (string, SCM_UNDEFINED);
+}
-scm_ptobfuns scm_stptob =
+static scm_t_bits
+scm_make_stptob ()
{
- scm_markstream,
- noop0,
- prinstpt,
- 0,
- st_flush,
- 0,
- stfill_buffer,
- 0,
- 0,
-};
+ scm_t_bits tc = scm_make_port_type ("string", stfill_buffer, st_write);
+ scm_set_port_mark (tc, scm_markstream);
+ scm_set_port_end_input (tc, st_end_input);
+ scm_set_port_flush (tc, st_flush);
+ scm_set_port_seek (tc, st_seek);
+ scm_set_port_truncate (tc, st_truncate);
+ return tc;
+}
void
scm_init_strports ()
{
-#include "strports.x"
+ scm_tc16_strport = scm_make_stptob ();
+
+#include "libguile/strports.x"
}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff