summaryrefslogtreecommitdiff
path: root/gr-run-waveform/xyzzy-load.c
diff options
context:
space:
mode:
Diffstat (limited to 'gr-run-waveform/xyzzy-load.c')
-rw-r--r--gr-run-waveform/xyzzy-load.c436
1 files changed, 436 insertions, 0 deletions
diff --git a/gr-run-waveform/xyzzy-load.c b/gr-run-waveform/xyzzy-load.c
new file mode 100644
index 000000000..46b7376da
--- /dev/null
+++ b/gr-run-waveform/xyzzy-load.c
@@ -0,0 +1,436 @@
+/* Copyright (C) 1995,1996,1998,1999,2000,2001,2004,2006,2010 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+
+#ifdef HAVE_CONFIG_H
+# include <grconfig.h>
+#endif
+
+#include <string.h>
+#include <stdio.h>
+
+/* libpath.h is generated whenever the Makefile is rebuilt */
+#include "libpath.h"
+
+#include <libguile/__scm.h>
+#include <libguile/fports.h>
+#include <libguile/read.h>
+#include <libguile/eval.h>
+#include <libguile/throw.h>
+#include <libguile/alist.h>
+#include <libguile/dynwind.h>
+#include <libguile/root.h>
+#include <libguile/strings.h>
+#include <libguile/modules.h>
+#include <libguile/lang.h>
+#include <libguile/chars.h>
+#include <libguile/tags.h>
+#include <libguile/snarf.h>
+#include <libguile/srfi-13.h>
+#include <libguile/validate.h>
+#include <libguile/load.h>
+#include <libguile/fluids.h>
+
+// these headers where not in the original version of this file.
+#include <libguile/boolean.h>
+#include <libguile/pairs.h>
+#include <libguile/gc.h>
+#include <libguile/variable.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#ifndef R_OK
+#define R_OK 4
+#endif
+
+#include "xyzzy.h"
+
+// This is the magic number used when loading files
+static const char *MAGIC = "-XyZzY-";
+
+static SCM scm_listofnullstr;
+
+static SCM *scm_loc_load_hook;
+static SCM *scm_loc_load_path;
+static SCM *scm_loc_load_extensions;
+
+/* The current reader (a fluid). */
+static SCM *scm_loc_current_reader;
+
+
+/* Utility functions for assembling C strings in a buffer.
+ */
+
+struct stringbuf {
+ char *buf, *ptr;
+ size_t buf_len;
+};
+
+static void
+stringbuf_free (void *data)
+{
+ struct stringbuf *buf = (struct stringbuf *)data;
+ free (buf->buf);
+}
+
+static void
+stringbuf_grow (struct stringbuf *buf)
+{
+ size_t ptroff = buf->ptr - buf->buf;
+ buf->buf_len *= 2;
+ buf->buf = scm_realloc (buf->buf, buf->buf_len);
+ buf->ptr = buf->buf + ptroff;
+}
+
+static void
+stringbuf_cat_locale_string (struct stringbuf *buf, SCM str)
+{
+ size_t max_len = buf->buf_len - (buf->ptr - buf->buf) - 1;
+ size_t len = scm_to_locale_stringbuf (str, buf->ptr, max_len);
+ if (len > max_len)
+ {
+ /* buffer is too small, double its size and try again.
+ */
+ stringbuf_grow (buf);
+ stringbuf_cat_locale_string (buf, str);
+ }
+ else
+ {
+ /* string fits, terminate it and check for embedded '\0'.
+ */
+ buf->ptr[len] = '\0';
+ if (strlen (buf->ptr) != len)
+ scm_misc_error (NULL,
+ "string contains #\\nul character: ~S",
+ scm_list_1 (str));
+ buf->ptr += len;
+ }
+}
+
+static void
+stringbuf_cat (struct stringbuf *buf, char *str)
+{
+ size_t max_len = buf->buf_len - (buf->ptr - buf->buf) - 1;
+ size_t len = strlen (str);
+ if (len > max_len)
+ {
+ /* buffer is too small, double its size and try again.
+ */
+ stringbuf_grow (buf);
+ stringbuf_cat (buf, str);
+ }
+ else
+ {
+ /* string fits, copy it into buffer.
+ */
+ strcpy (buf->ptr, str);
+ buf->ptr += len;
+ }
+}
+
+/* Search PATH for a directory containing a file named FILENAME.
+ The file must be readable, and not a directory.
+ If we find one, return its full filename; otherwise, return #f.
+ If FILENAME is absolute, return it unchanged.
+ If given, EXTENSIONS is a list of strings; for each directory
+ in PATH, we search for FILENAME concatenated with each EXTENSION. */
+SCM_DEFINE (scm_xyzzy_search_path, "xyyzy-search-path", 2, 1, 0,
+ (SCM path, SCM filename, SCM extensions),
+ "Search @var{path} for a directory containing a file named\n"
+ "@var{filename}. The file must be readable, and not a directory.\n"
+ "If we find one, return its full filename; otherwise, return\n"
+ "@code{#f}. If @var{filename} is absolute, return it unchanged.\n"
+ "If given, @var{extensions} is a list of strings; for each\n"
+ "directory in @var{path}, we search for @var{filename}\n"
+ "concatenated with each @var{extension}.")
+#define FUNC_NAME s_scm_xyzzy_search_path
+{
+ struct stringbuf buf;
+ char *filename_chars;
+ size_t filename_len;
+ SCM result = SCM_BOOL_F;
+
+ if (SCM_UNBNDP (extensions))
+ extensions = SCM_EOL;
+
+ /* fprintf(stderr, "TRACE %s: %d %s\n", __FUNCTION__, __LINE__, scm_to_locale_string(SCM_CAR(path))); */
+
+ scm_dynwind_begin (0);
+ filename_chars = scm_to_locale_string (filename);
+ filename_len = strlen (filename_chars);
+ scm_dynwind_free (filename_chars);
+
+ /* If FILENAME is absolute, return it unchanged. */
+#ifdef __MINGW32__
+ if (((filename_len >= 1) &&
+ (filename_chars[0] == '/' || filename_chars[0] == '\\')) ||
+ ((filename_len >= 3) && filename_chars[1] == ':' &&
+ ((filename_chars[0] >= 'a' && filename_chars[0] <= 'z') ||
+ (filename_chars[0] >= 'A' && filename_chars[0] <= 'Z')) &&
+ (filename_chars[2] == '/' || filename_chars[2] == '\\')))
+#else
+ if (filename_len >= 1 && filename_chars[0] == '/')
+#endif
+ {
+ scm_dynwind_end ();
+ return filename;
+ }
+
+ /* If FILENAME has an extension, don't try to add EXTENSIONS to it. */
+ {
+ char *endp;
+
+ for (endp = filename_chars + filename_len - 1;
+ endp >= filename_chars;
+ endp--)
+ {
+ if (*endp == '.')
+ {
+ /* This filename already has an extension, so cancel the
+ list of extensions. */
+ extensions = SCM_EOL;
+ break;
+ }
+#ifdef __MINGW32__
+ else if (*endp == '/' || *endp == '\\')
+#else
+ else if (*endp == '/')
+#endif
+ /* This filename has no extension, so keep the current list
+ of extensions. */
+ break;
+ }
+ }
+
+ /* This simplifies the loop below a bit.
+ */
+ if (scm_is_null (extensions))
+ extensions = scm_listofnullstr;
+
+ buf.buf_len = 512;
+ buf.buf = scm_malloc (buf.buf_len);
+ scm_dynwind_unwind_handler (stringbuf_free, &buf, SCM_F_WIND_EXPLICITLY);
+
+ /* Try every path element.
+ */
+ for (; scm_is_pair (path); path = SCM_CDR (path))
+ {
+ SCM dir = SCM_CAR (path);
+ SCM exts;
+ size_t sans_ext_len;
+
+ buf.ptr = buf.buf;
+ stringbuf_cat_locale_string (&buf, dir);
+
+ /* Concatenate the path name and the filename. */
+
+#ifdef __MINGW32__
+ if ((buf.ptr > buf.buf) && (buf.ptr[-1] != '/') && (buf.ptr[-1] != '\\'))
+#else
+ if ((buf.ptr > buf.buf) && (buf.ptr[-1] != '/'))
+#endif
+ stringbuf_cat (&buf, "/");
+
+ stringbuf_cat (&buf, filename_chars);
+ sans_ext_len = buf.ptr - buf.buf;
+
+ /* Try every extension. */
+ for (exts = extensions; scm_is_pair (exts); exts = SCM_CDR (exts))
+ {
+ SCM ext = SCM_CAR (exts);
+ struct stat mode;
+
+ buf.ptr = buf.buf + sans_ext_len;
+ stringbuf_cat_locale_string (&buf, ext);
+
+ /* If the file exists at all, we should return it. If the
+ file is inaccessible, then that's an error. */
+ /* fprintf(stderr, "TRACE %s: %d: \"%s\"\n", __FUNCTION__, __LINE__, buf.buf); */
+
+ if (xyzzy_file_exists(buf.buf)
+ || (stat (buf.buf, &mode) == 0
+ && ! (mode.st_mode & S_IFDIR)))
+ {
+ result = scm_from_locale_string (buf.buf);
+ goto end;
+ }
+ }
+
+ if (!SCM_NULL_OR_NIL_P (exts))
+ scm_wrong_type_arg_msg (NULL, 0, extensions, "proper list");
+ }
+
+ if (!SCM_NULL_OR_NIL_P (path))
+ scm_wrong_type_arg_msg (NULL, 0, path, "proper list");
+
+ end:
+
+ scm_dynwind_end ();
+
+ return result;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_xyzzy_primitive_load, "xyzzy-primitive-load", 1, 0, 0,
+ (SCM filename),
+ "Load the file named @var{filename} and evaluate its contents in\n"
+ "the top-level environment. The load paths are not searched;\n"
+ "@var{filename} must either be a full pathname or be a pathname\n"
+ "relative to the current directory. If the variable\n"
+ "@code{%load-hook} is defined, it should be bound to a procedure\n"
+ "that will be called before any code is loaded. See the\n"
+ "documentation for @code{%load-hook} later in this section.")
+#define FUNC_NAME s_scm_xyzzy_primitive_load
+{
+ SCM hook = *scm_loc_load_hook;
+ SCM_VALIDATE_STRING (1, filename);
+
+ char *ptr = scm_to_locale_string(filename);
+ /* fprintf(stderr, "TRACE %s: %d: %s\n", __FUNCTION__, __LINE__, ptr); */
+
+ if (scm_is_true (hook) && scm_is_false (scm_procedure_p (hook)))
+ SCM_MISC_ERROR ("value of %load-hook is neither a procedure nor #f",
+ SCM_EOL);
+
+ if (!scm_is_false (hook))
+ scm_call_1 (hook, filename);
+
+ { /* scope */
+ SCM port;
+
+ if (xyzzy_file_exists(ptr)){
+ /* fprintf(stderr, "TRACE: file %s is a XYZZY file system file!\n", ptr); */
+ port = xyzzy_open_file(filename);
+ } else {
+ port = scm_open_file (filename, scm_from_locale_string ("r"));
+ }
+ scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE);
+ scm_i_dynwind_current_load_port (port);
+
+ while (1)
+ {
+ SCM reader, form;
+
+ /* Lookup and use the current reader to read the next expression. */
+ reader = scm_fluid_ref(*scm_loc_current_reader);
+ if (reader == SCM_BOOL_F)
+ form = scm_read (port);
+ else
+ form = scm_call_1 (reader, port);
+
+ if (SCM_EOF_OBJECT_P (form))
+ break;
+
+ scm_primitive_eval_x (form);
+ }
+
+ scm_dynwind_end ();
+ scm_close_port (port);
+ }
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+/* Search %load-path for a directory containing a file named FILENAME.
+ The file must be readable, and not a directory.
+ If we find one, return its full filename; otherwise, return #f.
+ If FILENAME is absolute, return it unchanged. */
+SCM_DEFINE (scm_xyzzy_sys_search_load_path, "%xyzzy-search-load-path", 1, 0, 0,
+ (SCM filename),
+ "Search @var{%load-path} for the file named @var{filename},\n"
+ "which must be readable by the current user. If @var{filename}\n"
+ "is found in the list of paths to search or is an absolute\n"
+ "pathname, return its full pathname. Otherwise, return\n"
+ "@code{#f}. Filenames may have any of the optional extensions\n"
+ "in the @code{%load-extensions} list; @code{%search-load-path}\n"
+ "will try each extension automatically.")
+#define FUNC_NAME s_scm_xyzzy_sys_search_load_path
+{
+ SCM loadpath = scm_c_lookup("%load-path");
+ SCM path = scm_variable_ref(loadpath);
+ SCM exts = *scm_loc_load_extensions;
+ SCM_VALIDATE_STRING (1, filename);
+
+ /* fprintf(stderr, "TRACE %s: %d:\n", __FUNCTION__, __LINE__); */
+
+ if (scm_ilength (path) < 0)
+ SCM_MISC_ERROR ("%load-path is not a proper list", SCM_EOL);
+ if (scm_ilength (exts) < 0)
+ SCM_MISC_ERROR ("%load-extension list is not a proper list", SCM_EOL);
+
+ return scm_xyzzy_search_path (path, filename, exts);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_xyzzy_primitive_load_path, "xyzzy-primitive-load-path", 1, 0, 0,
+ (SCM filename),
+ "Search @var{%load-path} for the file named @var{filename} and\n"
+ "load it into the top-level environment. If @var{filename} is a\n"
+ "relative pathname and is not found in the list of search paths,\n"
+ "an error is signalled.")
+#define FUNC_NAME s_scm_xyzzy_primitive_load_path
+{
+ SCM full_filename;
+ char *filename_chars;
+ size_t filename_len;
+
+ filename_chars = scm_to_locale_string (filename);
+ filename_len = strlen (filename_chars);
+ scm_dynwind_free (filename_chars);
+
+ full_filename = scm_xyzzy_sys_search_load_path (filename);
+
+ /* fprintf(stderr, "TRACE %s: %d: %s\n", __FUNCTION__, __LINE__, scm_to_locale_string(full_filename)); */
+
+ if (scm_is_false (full_filename))
+ SCM_MISC_ERROR ("Unable to find the file ~S in load path",
+ scm_list_1 (filename));
+
+ return scm_xyzzy_primitive_load (full_filename);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_xyzzy_open_file, "xyzzy-open-file", 1, 0, 0,
+ (SCM filename),
+ "Return a new port which reads from @var{filename}")
+#define FUNC_NAME s_scm_xyzzy_open_file
+{
+ return xyzzy_open_file (filename);
+}
+#undef FUNC_NAME
+
+void
+scm_xyzzy_init (void)
+{
+ scm_listofnullstr = scm_permanent_object (scm_list_1 (scm_nullstr));
+ scm_loc_load_extensions = SCM_VARIABLE_LOC(scm_c_lookup("%load-extensions"));
+ scm_loc_load_hook = SCM_VARIABLE_LOC (scm_c_lookup("%load-hook"));
+ scm_loc_current_reader = SCM_VARIABLE_LOC (scm_c_lookup("current-reader"));
+
+ /* initialize our functions in the scheme VM */
+ scm_c_define_gsubr ("xyzzy-open-file", 1, 0, 0, (SCM (*)()) scm_xyzzy_open_file);
+ scm_c_define_gsubr ("xyzzy-primitive-load", 1, 0, 0, (SCM (*)()) scm_xyzzy_primitive_load);
+ scm_c_define_gsubr ("xyzzy-primitive-load-path", 1, 0, 0, (SCM (*)()) scm_xyzzy_primitive_load_path);
+ scm_c_define_gsubr ("%xyzzy-search-load-path", 1, 0, 0, (SCM (*)()) scm_xyzzy_sys_search_load_path);
+ scm_c_define_gsubr ("xyzzy-search-path", 2, 1, 0, (SCM (*)()) scm_xyzzy_search_path);
+}
generated by cgit (git 2.34.1) at 2024-12-22 02:59:01 +0000