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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 - 1)/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\
");
}
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