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+/* Copyright (C) 2003 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, 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+ *
+ * As a special exception, the Free Software Foundation gives permission
+ * for additional uses of the text contained in its release of SCM.
+ *
+ * The exception is that, if you link the SCM 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 SCM 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 SCM. If you copy
+ * code from other Free Software Foundation releases into a copy of
+ * SCM, 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 SCM, it is your choice
+ * whether to permit this exception to apply to your modifications.
+ * If you do not wish that, delete this exception notice.
+ */
+
+/* "byte.c" Strings as Bytes
+ Author: Aubrey Jaffer */
+
+#include "scm.h"
+
+char s_make_bytes[] = "make-bytes";
+SCM scm_make_bytes(k, n)
+ SCM k, n;
+{
+ SCM res;
+ register unsigned char *dst;
+ register long i;
+ ASRTER(INUMP(k) && (k >= 0), k, ARG1, s_make_bytes);
+ i = INUM(k);
+ res = makstr(i);
+ dst = UCHARS(res);
+ if (!UNBNDP(n)) {
+ ASRTER(INUMP(n) && 0 <= n && n <= MAKINUM(255), n, ARG2, s_make_bytes);
+ for(i--;i >= 0;i--) dst[i] = INUM(n);
+ }
+ return res;
+}
+#define s_bytes (s_make_bytes+5)
+SCM scm_bytes(ints)
+ SCM ints;
+{
+ SCM res;
+ register unsigned char *data;
+ long i = ilength(ints);
+ ASRTER(i >= 0, ints, ARG1, s_bytes);
+ res = makstr(i);
+ data = UCHARS(res);
+ for(;NNULLP(ints);ints = CDR(ints)) {
+ int n = INUM(CAR(ints));
+ ASRTER(INUMP(CAR(ints)) && 0 <= n && n <= 255, ints, ARG1, s_bytes);
+ *data++ = n;
+ }
+ return res;
+}
+static char s_bt_ref[] = "byte-ref";
+SCM scm_byte_ref(str, k)
+ SCM str, k;
+{
+ ASRTER(NIMP(str) && STRINGP(str), str, ARG1, s_bt_ref);
+ ASRTER(INUMP(k), k, ARG2, s_bt_ref);
+ ASRTER(0 <= INUM(k) && INUM(k) < LENGTH(str), k, OUTOFRANGE, s_bt_ref);
+ return MAKINUM(UCHARS(str)[INUM(k)]);
+}
+static char s_bt_set[] = "byte-set!";
+SCM scm_byte_set(str, k, n)
+ SCM str, k, n;
+{
+ ASRTER(NIMP(str) && STRINGP(str), str, ARG1, s_bt_set);
+ ASRTER(INUMP(k), k, ARG2, s_bt_set);
+ ASRTER(INUMP(n), n, ARG3, s_bt_set);
+ ASRTER(0 <= INUM(k) && INUM(k) < LENGTH(str), k, OUTOFRANGE, s_bt_set);
+ UCHARS(str)[INUM(k)] = INUM(n);
+ return UNSPECIFIED;
+}
+static char s_bytes2list[] = "bytes->list";
+SCM scm_bytes2list(str)
+ SCM str;
+{
+ long i;
+ SCM res = EOL;
+ unsigned char *src;
+ ASRTER(NIMP(str) && STRINGP(str), str, ARG1, s_bytes2list);
+ src = UCHARS(str);
+ for(i = LENGTH(str)-1;i >= 0;i--) res = cons((SCM)MAKINUM(src[i]), res);
+ return res;
+}
+static char s_bt_reverse[] = "bytes-reverse!";
+SCM scm_bytes_reverse(str)
+ SCM str;
+{
+ register char *dst;
+ register long k, len;
+ ASRTER(NIMP(str) && STRINGP(str), str, ARG1, s_bt_reverse);
+ len = LENGTH(str);
+ dst = CHARS(str);
+ for(k = len/2;k >= 0;k--) {
+ int tmp = dst[k];
+ dst[k] = dst[len - k - 1];
+ dst[len - k - 1] = tmp;
+ }
+ return str;
+}
+static char s_write_byte[] = "write-byte";
+SCM scm_write_byte(chr, port)
+ SCM chr, port;
+{
+ int k = INUM(chr);
+ if UNBNDP(port) port = cur_outp;
+ else ASRTER(NIMP(port) && OPOUTPORTP(port), port, ARG2, s_write_byte);
+ ASRTER(INUMP(chr) && 0 <= k && k <= 255, chr, ARG1, s_write_byte);
+ lputc(k, port);
+ return UNSPECIFIED;
+}
+static char s_read_byte[] = "read-byte";
+SCM scm_read_byte(port)
+ SCM port;
+{
+ int c;
+ if UNBNDP(port) port = cur_inp;
+ ASRTER(NIMP(port) && OPINPORTP(port), port, ARG1, s_read_byte);
+ c = lgetc(port);
+ if (EOF==c) return EOF_VAL;
+ return MAKINUM(c);
+}
+
+static char s_sub_rd[] = "substring-read!";
+SCM scm_substring_read(sstr, start, args)
+ SCM sstr, start, args;
+{
+ SCM end, port;
+ long len;
+ long alen = ilength(args);
+ ASRTER(1 <= alen && alen <= 2, args, WNA, s_sub_rd);
+ end = CAR(args);
+ port = (2==alen) ? CAR(CDR(args)) : cur_inp;
+ ASRTER(NIMP(sstr) && STRINGP(sstr), sstr, ARG1, s_sub_rd);
+ ASRTER(INUMP(start), start, ARG2, s_sub_rd);
+ ASRTER(INUMP(end), end, ARG3, s_sub_rd);
+ ASRTER(NIMP(port) && OPINFPORTP(port), port, ARG4, s_sub_rd);
+ len = LENGTH(sstr);
+ start = INUM(start);
+ end = INUM(end);
+ ASRTER(0 <= start && start <= len, MAKINUM(start), OUTOFRANGE, s_sub_rd);
+ ASRTER(0 <= end && end <= len, MAKINUM(end), OUTOFRANGE, s_sub_rd);
+ if (start==end) return INUM0;
+ if (start < end) {
+ long ans = 0;
+ /* An ungetc before an fread will not work on some systems if setbuf(0),
+ so we read one element char by char. */
+ if CRDYP(port) {
+ CHARS(sstr)[start] = lgetc(port);
+ start += 1;
+ len -= 1;
+ ans = 1;
+ }
+ SYSCALL(ans += fread(CHARS(sstr)+start,
+ (sizet)1,
+ (sizet)(end - start),
+ STREAM(port)););
+ return MAKINUM(ans);
+ }
+ else {
+ long idx = start;
+ while (end <= idx) {
+ int chr = lgetc(port);
+ if (EOF==chr) return MAKINUM(start - idx);
+ CHARS(sstr)[--idx] = chr;
+ }
+ return MAKINUM(start - end);
+ }
+}
+
+static char s_sub_wr[] = "substring-write";
+SCM scm_substring_write(sstr, start, args)
+ SCM sstr, start, args;
+{
+ SCM end, port;
+ long len;
+ long alen = ilength(args);
+ ASRTER(1 <= alen && alen <= 2, args, WNA, s_sub_wr);
+ end = CAR(args);
+ port = (2==alen) ? CAR(CDR(args)) : cur_outp;
+ ASRTER(NIMP(sstr) && STRINGP(sstr), sstr, ARG1, s_sub_wr);
+ ASRTER(INUMP(start), start, ARG2, s_sub_wr);
+ ASRTER(INUMP(end), end, ARG3, s_sub_wr);
+ ASRTER(NIMP(port) && OPOUTFPORTP(port), port, ARG4, s_sub_wr);
+ len = LENGTH(sstr);
+ start = INUM(start);
+ end = INUM(end);
+ ASRTER(0 <= start && start <= len, MAKINUM(start), OUTOFRANGE, s_sub_wr);
+ ASRTER(0 <= end && end <= len, MAKINUM(end), OUTOFRANGE, s_sub_wr);
+ if (start==end) return INUM0;
+ if (start < end) {
+ long ans;
+ SYSCALL(ans = lfwrite(CHARS(sstr)+start,
+ (sizet)1,
+ (sizet)(sizet)(end - start),
+ port););
+ return MAKINUM(ans);
+ }
+ else {
+ long idx = start;
+ while (end <= --idx) {
+ if (feof(STREAM(port))) return MAKINUM(start - idx - 1);
+ lputc(CHARS(sstr)[idx], port);
+ }
+ return MAKINUM(start - end);
+ }
+}
+
+static iproc subr1s[] = {
+ {"list->bytes", scm_bytes},
+ {s_bytes2list, scm_bytes2list},
+ {s_bt_reverse, scm_bytes_reverse},
+ {0, 0}};
+
+static iproc subr2os[] = {
+ {s_write_byte, scm_write_byte},
+ {s_make_bytes, scm_make_bytes},
+ {0, 0}};
+
+static iproc lsubr2s[] = {
+ {s_sub_rd, scm_substring_read},
+ {s_sub_wr, scm_substring_write},
+ {0, 0}};
+
+
+void init_byte()
+{
+ init_iprocs(subr1s, tc7_subr_1);
+ init_iprocs(subr2os, tc7_subr_2o);
+ init_iprocs(lsubr2s, tc7_lsubr_2);
+ make_subr(s_bytes, tc7_lsubr, scm_bytes);
+ make_subr(s_read_byte, tc7_subr_1o, scm_read_byte);
+ make_subr(s_bt_ref, tc7_subr_2, scm_byte_ref);
+ make_subr(s_bt_set, tc7_subr_3, scm_byte_set);
+ add_feature("byte");
+ scm_ldstr("\n\
+(define bytes-length string-length)\n\
+(define bytes-copy string-copy)\n\
+(define (bytes-reverse bytes)\n\
+ (bytes-reverse! (bytes-copy bytes)))\n\
+(define (read-bytes n . port)\n\
+ (let* ((len (abs n))\n\
+ (byts (make-bytes len))\n\
+ (cnt (if (positive? n)\n\
+ (apply substring-read! byts 0 n port)\n\
+ (apply substring-read! byts (- n) 0 port))))\n\
+ (if (= cnt len)\n\
+ byts\n\
+ (if (positive? n)\n\
+ (substring byts 0 cnt)\n\
+ (substring byts (- len cnt) len)))))\n\
+(define (write-bytes bytes n . port)\n\
+ (if (positive? n)\n\
+ (apply substring-write bytes 0 n port)\n\
+ (apply substring-write bytes (- n) 0 port)))\n\
+");
+}