-/* Copyright (C) 1995,1996 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
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program 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 this software; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * 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 <stdio.h>
-#include "_scm.h"
-#include "unif.h"
-#include "eval.h"
-
-#include "strports.h"
-
-#ifdef HAVE_STRING_H
-#include <string.h>
-#endif
-
-\f
-
-/* {Ports - string ports}
- *
- */
-
-#ifdef __STDC__
-static int
-prinstpt (SCM exp, SCM port, int writing)
-#else
-static int
-prinstpt (exp, port, writing)
- SCM exp;
- SCM port;
- int writing;
-#endif
-{
- scm_prinport (exp, port, "string");
- return !0;
-}
-
-#ifdef __STDC__
-static int
-stputc (int c, SCM p)
-#else
-static int
-stputc (c, p)
- int c;
- SCM p;
-#endif
-{
- scm_sizet ind = SCM_INUM (SCM_CAR (p));
- SCM_DEFER_INTS;
- if (ind >= SCM_LENGTH (SCM_CDR (p)))
- scm_vector_set_length_x (SCM_CDR (p), SCM_MAKINUM (ind + (ind >> 1)));
- SCM_ALLOW_INTS;
- SCM_CHARS (SCM_CDR (p))[ind] = c;
- SCM_CAR (p) = SCM_MAKINUM (ind + 1);
- return c;
-}
-
-#ifdef __STDC__
-static scm_sizet
-stwrite (char *str, scm_sizet siz, scm_sizet num, SCM p)
-#else
-static scm_sizet
-stwrite (str, siz, num, p)
- char *str;
- scm_sizet siz;
- scm_sizet num;
- SCM p;
-#endif
-{
- scm_sizet ind = SCM_INUM (SCM_CAR (p));
- scm_sizet len = siz * num;
- char *dst;
- SCM_DEFER_INTS;
- if (ind + len >= SCM_LENGTH (SCM_CDR (p)))
- scm_vector_set_length_x (SCM_CDR (p), SCM_MAKINUM (ind + len + ((ind + len) >> 1)));
- SCM_ALLOW_INTS;
- dst = &(SCM_CHARS (SCM_CDR (p))[ind]);
- while (len--)
- dst[len] = str[len];
- SCM_CAR (p) = SCM_MAKINUM (ind + siz * num);
- return num;
-}
-
-#ifdef __STDC__
-static int
-stputs (char *s, SCM p)
-#else
-static int
-stputs (s, p)
- char *s;
- SCM p;
-#endif
-{
- stwrite (s, 1, strlen (s), p);
- return 0;
-}
-
-#ifdef __STDC__
-static int
-stgetc (SCM p)
-#else
-static int
-stgetc (p)
- SCM p;
-#endif
-{
- scm_sizet ind = SCM_INUM (SCM_CAR (p));
- if (ind >= SCM_ROLENGTH (SCM_CDR (p)))
- return EOF;
- SCM_CAR (p) = SCM_MAKINUM (ind + 1);
- return SCM_ROUCHARS (SCM_CDR (p))[ind];
-}
-
-#ifdef __STDC__
-SCM
-scm_mkstrport (SCM pos, SCM str, long modes, char * caller)
-#else
-SCM
-scm_mkstrport (pos, str, modes, caller)
- SCM pos;
- SCM str;
- long modes;
- char * caller;
-#endif
-{
- SCM z;
- SCM stream;
- struct scm_port_table * pt;
-
- 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 = scm_cons(pos, str);
- SCM_NEWCELL (z);
- SCM_DEFER_INTS;
- pt = scm_add_to_port_table (z);
- SCM_CAR (z) = scm_tc16_strport | modes;
- SCM_SETPTAB_ENTRY (z, pt);
- SCM_SETSTREAM (z, stream);
- SCM_ALLOW_INTS;
- return z;
-}
-
-SCM_PROC(s_call_with_output_string, "call-with-output-string", 1, 0, 0, scm_call_with_output_string);
-#ifdef __STDC__
-SCM
-scm_call_with_output_string (SCM proc)
-#else
-SCM
-scm_call_with_output_string (proc)
- SCM proc;
-#endif
-{
- 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;
- SCM_DEFER_INTS;
- answer = scm_makfromstr (SCM_CHARS (SCM_CDR (SCM_STREAM (p))),
- SCM_INUM (SCM_CAR (SCM_STREAM (p))),
- 0);
- SCM_ALLOW_INTS;
- return answer;
- }
-}
-
-
-
-/* Return a Scheme string obtained by printing a given object.
- */
-
-#ifdef __STDC__
-SCM
-scm_strprint_obj (SCM obj)
-#else
-SCM
-scm_strprint_obj (obj)
- SCM obj;
-#endif
-{
- 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);
- {
- SCM answer;
- SCM_DEFER_INTS;
- answer = scm_makfromstr (SCM_CHARS (SCM_CDR (SCM_STREAM (port))),
- SCM_INUM (SCM_CAR (SCM_STREAM (port))),
- 0);
- SCM_ALLOW_INTS;
- return answer;
- }
-}
-
-
-
-
-SCM_PROC(s_call_with_input_string, "call-with-input-string", 2, 0, 0, scm_call_with_input_string);
-#ifdef __STDC__
-SCM
-scm_call_with_input_string (SCM str, SCM proc)
-#else
-SCM
-scm_call_with_input_string (str, proc)
- SCM str;
- SCM proc;
-#endif
-{
- SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, s_call_with_input_string);
- return scm_apply (proc, p, scm_listofnull);
-}
-
-#ifdef __STDC__
-static int
-noop0 (FILE *stream)
-#else
-static int
-noop0 (stream)
- FILE *stream;
-#endif
-{
- return 0;
-}
-
-
-scm_ptobfuns scm_stptob =
-{
- scm_markstream,
- noop0,
- prinstpt,
- 0,
- stputc,
- stputs,
- stwrite,
- noop0,
- stgetc,
- 0
-};
-
-
-#ifdef __STDC__
-void
-scm_init_strports (void)
-#else
-void
-scm_init_strports ()
-#endif
-{
-#include "strports.x"
-}
-
+/* 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
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program 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 this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
+ *
+ * As a special exception, the Free Software Foundation gives permission
+ * for additional uses of the text contained in its release of GUILE.
+ *
+ * The exception is that, if you link the GUILE library with other files
+ * to produce an executable, this does not by itself cause the
+ * resulting executable to be covered by the GNU General Public License.
+ * Your use of that executable is in no way restricted on account of
+ * linking the GUILE library code into it.
+ *
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ *
+ * This exception applies only to the code released by the
+ * Free Software Foundation under the name GUILE. If you copy
+ * code from other Free Software Foundation releases into a copy of
+ * GUILE, as the General Public License permits, the exception does
+ * not apply to the code that you add in this way. To avoid misleading
+ * anyone as to the status of such modified files, you must delete
+ * this exception notice from them.
+ *
+ * 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>
+#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/strports.h"
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+\f
+
+/* {Ports - string ports}
+ *
+ */
+
+/* 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_port *pt = SCM_PTAB_ENTRY (port);
+
+ if (pt->read_pos >= pt->read_end)
+ return EOF;
+ else
+ 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_port *pt, off_t new_size)
+{
+ 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;
+
+ for (i = 0; i != min_size; ++i)
+ SCM_STRING_CHARS (new_stream) [i] = SCM_STRING_CHARS (old_stream) [i];
+
+ /* reset buffer. */
+ {
+ 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)
+{
+ scm_port *pt = SCM_PTAB_ENTRY (port);
+
+ if (pt->write_pos == pt->write_end)
+ {
+ 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;
+}
+
+static void
+st_write (SCM port, const void *data, size_t size)
+{
+ scm_port *pt = SCM_PTAB_ENTRY (port);
+ const char *input = (char *) data;
+
+ 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
+st_seek (SCM port, off_t offset, int whence)
+{
+ scm_port *pt = SCM_PTAB_ENTRY (port);
+ off_t target;
+
+ 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_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_port *pt;
+ int 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);
+ SCM_NEWCELL (z);
+ SCM_DEFER_INTS;
+ pt = scm_add_to_port_table (z);
+ SCM_SET_CELL_TYPE (z, scm_tc16_strport | modes);
+ SCM_SETPTAB_ENTRY (z, pt);
+ 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 = 1;
+
+ 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_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_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,
+ FUNC_NAME);
+ scm_apply (proc, p, scm_listofnull);
+
+ return scm_strport_to_string (p);
+}
+#undef FUNC_NAME
+
+
+
+/* Return a Scheme string obtained by printing a given object.
+ */
+
+
+SCM
+scm_strprint_obj (SCM obj)
+{
+ SCM str;
+ SCM port;
+
+ str = scm_makstr (0, 0);
+ port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, "scm_strprint_obj");
+ scm_prin1 (obj, port, 1);
+ {
+ return scm_strport_to_string (port);
+ }
+}
+
+
+
+
+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, 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 (char *expr)
+{
+ SCM port = scm_mkstrport (SCM_INUM0,
+ scm_makfrom0str (expr),
+ SCM_OPN | SCM_RDNG,
+ "scm_eval_0str");
+ SCM form;
+
+ /* Read expressions from that port; ignore the values. */
+ form = scm_read (port);
+
+ scm_close_port (port);
+ return form;
+}
+
+/* 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 (const char *expr)
+{
+ return scm_eval_string (scm_makfrom0str (expr));
+}
+
+
+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_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, 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.
+ It's a string port anyway, so there's no advantage to closing it
+ early. */
+
+ return ans;
+}
+#undef FUNC_NAME
+
+void scm_make_stptob (void); /* Called from ports.c */
+
+void
+scm_make_stptob ()
+{
+ 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);
+}
+
+void
+scm_init_strports ()
+{
+#include "libguile/strports.x"
+}
+
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff