-/* Copyright (C) 1995,1996,1998,1999 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1998,1999, 2000 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. */
+
+/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
+ gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
+
\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 "strports.h"
+#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/strports.h"
#ifdef HAVE_STRING_H
#include <string.h>
*
*/
-
-static int
-prinstpt (SCM exp, SCM port, scm_print_state *pstate)
-{
- scm_prinport (exp, port, "string");
- return !0;
-}
+/* 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.
+*/
static int
stfill_buffer (SCM port)
{
- SCM str = SCM_STREAM (port);
scm_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_grow_port (scm_port *pt, off_t add)
+st_resize_port (scm_port *pt, off_t new_size)
{
- off_t new_size = pt->write_buf_size + add;
+ SCM old_stream = SCM_PACK (pt->stream);
+ SCM new_stream = scm_makstr (new_size, 0);
+ 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;
- scm_vector_set_length_x (pt->stream,
- SCM_MAKINUM (new_size));
- pt->read_buf_size = pt->write_buf_size = new_size;
- /* reset buffer in case reallocation moved the string. */
+ for (i = 0; i != min_size; ++i)
+ SCM_STRING_CHARS (new_stream) [i] = SCM_STRING_CHARS (old_stream) [i];
+
+ /* reset buffer. */
{
- off_t index = pt->write_pos - pt->write_buf;
-
- pt->read_buf = pt->write_buf = SCM_CHARS (pt->stream);
- pt->write_pos = pt->write_buf + index;
- pt->read_end = pt->write_end = pt->write_buf + pt->write_buf_size;
+ pt->stream = 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;
}
}
+/* 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)
{
if (pt->write_pos == pt->write_end)
{
- st_grow_port (pt, 1);
+ st_resize_port (pt, pt->write_buf_size + SCM_WRITE_BLOCK);
}
pt->read_pos = pt->write_pos;
- pt->rw_active = 0;
+ 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;
}
static void
-st_read_flush (SCM port, int offset)
+st_write (SCM port, const void *data, size_t size)
{
scm_port *pt = SCM_PTAB_ENTRY (port);
+ const char *input = (char *) data;
- pt->write_pos = (unsigned char *) pt->read_pos;
- pt->rw_active = 0;
+ while (size > 0)
+ {
+ int space = pt->write_end - pt->write_pos;
+ int write_len = (size > space) ? space : size;
+
+ strncpy ((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);
+ }
+}
+
+static void
+st_end_input (SCM port, int offset)
+{
+ scm_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;
}
static off_t
scm_port *pt = SCM_PTAB_ENTRY (port);
off_t target;
- switch (whence)
+ if (pt->rw_active == SCM_PORT_READ && offset == 0 && whence == SEEK_CUR)
+ /* special case to avoid disturbing the unread-char buffer. */
{
- case SEEK_CUR:
- if (SCM_CAR (port) & SCM_WRTNG)
- target = pt->write_pos - pt->write_buf + offset;
+ 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 + offset;
- break;
- case SEEK_END:
- target = pt->write_end - pt->write_buf + offset;
- break;
- default: /* SEEK_SET */
- target = offset;
- break;
+ {
+ target = pt->read_pos - pt->read_buf;
+ }
}
- if (target < 0)
- scm_misc_error ("st_seek", "negative offset",
- scm_cons (SCM_MAKINUM (target), EOF));
- if (target > pt->read_buf_size)
+ else
+ /* all other cases. */
{
- st_grow_port (pt, target - pt->read_buf_size);
+ 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;
+ }
}
- pt->read_pos = pt->write_pos = pt->read_buf + target;
return target;
}
static void
-st_ftruncate (SCM port, off_t length)
+st_truncate (SCM port, off_t length)
{
scm_port *pt = SCM_PTAB_ENTRY (port);
- off_t old_len = pt->write_end - pt->write_buf;
+
+ 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 (length != old_len)
- st_grow_port (pt, length - old_len);
+ if (pt->write_pos > pt->read_end)
+ pt->write_pos = pt->read_end;
}
SCM
-scm_mkstrport (pos, str, modes, caller)
- SCM pos;
- SCM str;
- long modes;
- const char * caller;
+scm_mkstrport (SCM pos, SCM str, long modes, const char *caller)
{
SCM z;
scm_port *pt;
int str_len;
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);
- str_len = SCM_ROLENGTH (str);
+ 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_NEWCELL (z);
SCM_DEFER_INTS;
pt = scm_add_to_port_table (z);
- SCM_SETCAR (z, scm_tc16_strport | modes);
+ SCM_SET_CELL_TYPE (z, scm_tc16_strport | modes);
SCM_SETPTAB_ENTRY (z, pt);
- SCM_SETSTREAM (z, str);
- pt->write_buf = pt->read_buf = SCM_ROCHARS (str);
+ SCM_SETSTREAM (z, SCM_UNPACK (str));
+ pt->write_buf = pt->read_buf = SCM_ROUCHARS (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 = (modes & SCM_RDNG) && (modes & SCM_WRTNG);
+
+ pt->rw_random = 1;
+
SCM_ALLOW_INTS;
+
+ /* ensure write_pos is writable. */
if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end)
st_flush (z);
return z;
}
-SCM_PROC(s_call_with_output_string, "call-with-output-string", 1, 0, 0, scm_call_with_output_string);
+/* create a new string from a string port's buffer. */
+SCM scm_strport_to_string (SCM port)
+{
+ scm_port *pt = SCM_PTAB_ENTRY (port);
+
+ if (pt->rw_active == SCM_PORT_WRITE)
+ st_flush (port);
+ return scm_makfromstr ((char *) pt->read_buf, pt->read_buf_size, 0);
+}
-SCM
-scm_call_with_output_string (proc)
- SCM proc;
+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;
p = scm_mkstrport (SCM_INUM0,
scm_make_string (SCM_INUM0, SCM_UNDEFINED),
SCM_OPN | SCM_WRTNG,
- s_call_with_output_string);
+ FUNC_NAME);
scm_apply (proc, p, scm_listofnull);
- {
- SCM answer;
-
- /* can't use pt->write_pos, in case port position was changed with
- seek.
-
- The port buffer protocol promises that you can always store at
- least one character at write_pos. This means that the
- underlying string always has one spare character at the end,
- that the user didn't write. Make sure we don't include that in
- the result. */
- answer = scm_makfromstr (SCM_CHARS (SCM_STREAM (p)),
- SCM_LENGTH (SCM_STREAM (p)) - 1,
- 0);
- return answer;
- }
+
+ return scm_strport_to_string (p);
}
+#undef FUNC_NAME
SCM
-scm_strprint_obj (obj)
- SCM obj;
+scm_strprint_obj (SCM obj)
{
SCM str;
SCM port;
- str = scm_makstr (64, 0);
- port = scm_mkstrport (SCM_MAKINUM (0), str, SCM_OPN | SCM_WRTNG, "scm_strprint_obj");
+ str = scm_makstr (0, 0);
+ port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, "scm_strprint_obj");
scm_prin1 (obj, port, 1);
{
- scm_port *pt = SCM_PTAB_ENTRY (port);
- SCM answer;
-
- answer = scm_makfromstr (SCM_CHARS (SCM_STREAM (port)),
- pt->write_pos - pt->write_buf,
- 0);
- return answer;
+ return scm_strport_to_string (port);
}
}
-SCM_PROC(s_call_with_input_string, "call-with-input-string", 2, 0, 0, scm_call_with_input_string);
-
-SCM
-scm_call_with_input_string (str, proc)
- SCM str;
- SCM proc;
+SCM_DEFINE (scm_call_with_input_string, "call-with-input-string", 2, 0, 0,
+ (SCM str, SCM proc),
+ "Calls the one-argument procedure @var{proc} with a newly created input\n"
+ "port from which @var{string}'s contents may be read. The value yielded\n"
+ "by the @var{proc} is returned.")
+#define FUNC_NAME s_scm_call_with_input_string
{
- SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, s_call_with_input_string);
+ SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, FUNC_NAME);
return scm_apply (proc, p, scm_listofnull);
}
+#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_read_0str (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");
/* 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_eval_0str (const char *expr)
{
return scm_eval_string (scm_makfrom0str (expr));
}
-SCM_PROC (s_eval_string, "eval-string", 1, 0, 0, scm_eval_string);
-
-SCM
-scm_eval_string (string)
- SCM string;
+SCM_DEFINE (scm_eval_string, "eval-string", 1, 0, 0,
+ (SCM string),
+ "Evaluate @var{string} as the text representation of a Scheme form\n"
+ "or forms, and return whatever value they produce.\n"
+ "Evaluation takes place in (interaction-environment).")
+#define FUNC_NAME s_scm_eval_string
{
- SCM port = scm_mkstrport (SCM_MAKINUM (0), string, SCM_OPN | SCM_RDNG,
+ SCM port = scm_mkstrport (SCM_INUM0, string, SCM_OPN | SCM_RDNG,
"scm_eval_0str");
SCM form;
SCM ans = SCM_UNSPECIFIED;
+ SCM module = scm_interaction_environment ();
/* Read expressions from that port; ignore the values. */
while (!SCM_EOF_OBJECT_P (form = scm_read (port)))
- ans = scm_eval_x (form);
+ ans = scm_eval_x (form, module);
/* 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;
}
+#undef FUNC_NAME
+void scm_make_stptob (void); /* Called from ports.c */
-
-static int noop0 SCM_P ((SCM stream));
-
-static int
-noop0 (stream)
- SCM stream;
+void
+scm_make_stptob ()
{
- return 0;
+ long 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);
}
-
-scm_ptobfuns scm_stptob =
-{
- scm_markstream,
- noop0,
- prinstpt,
- 0,
- st_flush,
- st_read_flush,
- 0,
- stfill_buffer,
- st_seek,
- st_ftruncate,
- 0,
-};
-
-
-
void
scm_init_strports ()
{
-#include "strports.x"
+#include "libguile/strports.x"
}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff