-/* Copyright (C) 1995,1996,2000,2001 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,2000,2001, 2004, 2005, 2006 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 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 2.1 of the License, or (at your option) any later version.
*
- * 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.
+ * 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.
*
- * 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. */
+ * 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
+ */
\f
void scm_error_pair_access (SCM non_pair)
{
static unsigned int running = 0;
- SCM message = scm_makfrom0str ("Non-pair accessed with SCM_C[AD]R: `~S´\n");
+ SCM message = scm_from_locale_string ("Non-pair accessed with SCM_C[AD]R: `~S'\n");
if (!running)
{
"@code{#f}.")
#define FUNC_NAME s_scm_pair_p
{
- return SCM_BOOL (SCM_CONSP (x));
+ return scm_from_bool (scm_is_pair (x));
}
#undef FUNC_NAME
+SCM
+scm_car (SCM pair)
+{
+ if (!scm_is_pair (pair))
+ scm_wrong_type_arg_msg (NULL, 0, pair, "pair");
+ return SCM_CAR (pair);
+}
+
+SCM
+scm_cdr (SCM pair)
+{
+ if (!scm_is_pair (pair))
+ scm_wrong_type_arg_msg (NULL, 0, pair, "pair");
+ return SCM_CDR (pair);
+}
+
+SCM
+scm_i_chase_pairs (SCM tree, scm_t_uint32 pattern)
+{
+ do
+ {
+ if (!scm_is_pair (tree))
+ scm_wrong_type_arg_msg (NULL, 0, tree, "pair");
+ tree = (pattern & 1) ? SCM_CAR (tree) : SCM_CDR (tree);
+ pattern >>= 2;
+ }
+ while (pattern);
+ return tree;
+}
SCM_DEFINE (scm_set_car_x, "set-car!", 2, 0, 0,
(SCM pair, SCM value),
\f
-static const char * cxrs[] =
+/* Every cxr-pattern is made up of pairs of bits, starting with the two least
+ * significant bits. If in a pair of bits the least significant of the two
+ * bits is 0, this means CDR, otherwise CAR. The most significant bits of the
+ * two bits is only needed to indicate when cxr-ing is ready. This is the
+ * case, when all remaining pairs of bits equal 00. */
+
+typedef struct {
+ const char *name;
+ unsigned char pattern;
+} t_cxr;
+
+static const t_cxr cxrs[] =
{
- "car",
- "cdr",
- "caar",
- "cadr",
- "cdar",
- "cddr",
- "caaar",
- "caadr",
- "cadar",
- "caddr",
- "cdaar",
- "cdadr",
- "cddar",
- "cdddr",
- "caaaar",
- "caaadr",
- "caadar",
- "caaddr",
- "cadaar",
- "cadadr",
- "caddar",
- "cadddr",
- "cdaaar",
- "cdaadr",
- "cdadar",
- "cdaddr",
- "cddaar",
- "cddadr",
- "cdddar",
- "cddddr",
- 0
+ {"cdr", 0x02}, /* 00000010 */
+ {"car", 0x03}, /* 00000011 */
+ {"cddr", 0x0a}, /* 00001010 */
+ {"cdar", 0x0b}, /* 00001011 */
+ {"cadr", 0x0e}, /* 00001110 */
+ {"caar", 0x0f}, /* 00001111 */
+ {"cdddr", 0x2a}, /* 00101010 */
+ {"cddar", 0x2b}, /* 00101011 */
+ {"cdadr", 0x2e}, /* 00101110 */
+ {"cdaar", 0x2f}, /* 00101111 */
+ {"caddr", 0x3a}, /* 00111010 */
+ {"cadar", 0x3b}, /* 00111011 */
+ {"caadr", 0x3e}, /* 00111110 */
+ {"caaar", 0x3f}, /* 00111111 */
+ {"cddddr", 0xaa}, /* 10101010 */
+ {"cdddar", 0xab}, /* 10101011 */
+ {"cddadr", 0xae}, /* 10101110 */
+ {"cddaar", 0xaf}, /* 10101111 */
+ {"cdaddr", 0xba}, /* 10111010 */
+ {"cdadar", 0xbb}, /* 10111011 */
+ {"cdaadr", 0xbe}, /* 10111110 */
+ {"cdaaar", 0xbf}, /* 10111111 */
+ {"cadddr", 0xea}, /* 11101010 */
+ {"caddar", 0xeb}, /* 11101011 */
+ {"cadadr", 0xee}, /* 11101110 */
+ {"cadaar", 0xef}, /* 11101111 */
+ {"caaddr", 0xfa}, /* 11111010 */
+ {"caadar", 0xfb}, /* 11111011 */
+ {"caaadr", 0xfe}, /* 11111110 */
+ {"caaaar", 0xff}, /* 11111111 */
+ {0, 0}
};
\f
{
unsigned int subnr = 0;
- for (subnr = 0; cxrs [subnr]; subnr++)
- scm_c_define_subr (cxrs [subnr], scm_tc7_cxr, NULL);
+ for (subnr = 0; cxrs[subnr].name; subnr++)
+ {
+ SCM (*pattern) () = (SCM (*) ()) (scm_t_bits) cxrs[subnr].pattern;
+ scm_c_define_subr (cxrs[subnr].name, scm_tc7_cxr, pattern);
+ }
#include "libguile/pairs.x"
}
HCoop / bpt / guile.git / blobdiff