mes/src/strings.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes 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 3 of the License, or (at
* your option) any later version.
*
* GNU Mes 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#define MAX_STRING 524288
char g_buf[MAX_STRING];
void
assert_max_string (size_t i, char const* msg, char* string)
{
if (i > MAX_STRING) // Mes must be able to make g_buf
{
eputs (msg);
eputs (":string too long[");
eputs (itoa (i));
eputs ("]:");
string[MAX_STRING-1] = 0;
eputs (string);
error (cell_symbol_system_error, cell_f);
}
}
char const*
list_to_cstring (SCM list, size_t* size)
{
size_t i = 0;
char *p = g_buf;
while (list != cell_nil)
{
if (i > MAX_STRING)
assert_max_string (i, "list_to_string", g_buf);
g_buf[i++] = VALUE (car (list));
list = cdr (list);
}
g_buf[i] = 0;
*size = i;
return g_buf;
}
size_t
bytes_cells (size_t length)
{
return (1 + sizeof (long) + sizeof (long) + length + sizeof (SCM)) / sizeof (SCM);
}
SCM
make_bytes (char const* s, size_t length)
{
size_t size = bytes_cells (length);
SCM x = alloc (size);
TYPE (x) = TBYTES;
LENGTH (x) = length;
char *p = (char*)&g_cells[x].cdr;
if (!length)
*(char*)p = 0;
else
memcpy (p, s, length + 1);
return x;
}
SCM
make_string (char const* s, size_t length)
{
if (length > MAX_STRING)
assert_max_string (length, "make_string", (char*)s);
SCM x = make_cell__ (TSTRING, length, 0);
SCM v = make_bytes (s, length);
CDR (x) = v;
return x;
}
SCM
string_equal_p (SCM a, SCM b) ///((name . "string=?"))
{
if (! ((TYPE (a) == TSTRING && TYPE (b) == TSTRING)
|| (TYPE (a) == TKEYWORD || TYPE (b) == TKEYWORD)))
{
eputs ("type a: "); eputs (itoa (TYPE (a))); eputs ("\n");
eputs ("type b: "); eputs (itoa (TYPE (b))); eputs ("\n");
eputs ("a= "); write_error_ (a); eputs ("\n");
eputs ("b= "); write_error_ (b); eputs ("\n");
assert ((TYPE (a) == TSTRING && TYPE (b) == TSTRING)
|| (TYPE (a) == TKEYWORD || TYPE (b) == TKEYWORD));
}
if (a == b
|| STRING (a) == STRING (b)
|| (!LENGTH (a) && !LENGTH (b))
|| (LENGTH (a) == LENGTH (b)
&& !memcmp (CSTRING (a), CSTRING (b), LENGTH (a))))
return cell_t;
return cell_f;
}
SCM
symbol_to_string (SCM symbol)
{
return make_cell__ (TSTRING, CAR (symbol), CDR (symbol));
}
SCM
symbol_to_keyword (SCM symbol)
{
return make_cell__ (TKEYWORD, CAR (symbol), CDR (symbol));
}
SCM
keyword_to_string (SCM keyword)
{
return make_cell__ (TSTRING, CAR (keyword), CDR (keyword));
}
SCM
string_to_symbol (SCM string)
{
SCM x = hash_ref (g_symbols, string, cell_f);
if (x == cell_f)
x = make_symbol (string);
return x;
}
SCM
make_symbol (SCM string)
{
SCM x = make_cell__ (TSYMBOL, LENGTH (string), STRING (string));
hash_set_x (g_symbols, string, x);
return x;
}
SCM
bytes_to_list (char const* s, size_t i)
{
SCM p = cell_nil;
while (i--)
{
int c = (0x100 + s[i]) % 0x100;
p = cons (MAKE_CHAR (c), p);
}
return p;
}
SCM
cstring_to_list (char const* s)
{
return bytes_to_list (s, strlen (s));
}
SCM
cstring_to_symbol (char const *s)
{
SCM string = MAKE_STRING0 (s);
return string_to_symbol (string);
}
SCM
string_to_list (SCM string)
{
return bytes_to_list (CSTRING (string), LENGTH (string));
}
SCM
list_to_string (SCM list)
{
size_t size;
char const *s = list_to_cstring (list, &size);
return make_string (s, size);
}
SCM
read_string (SCM port) ///((arity . n))
{
int fd = g_stdin;
if (TYPE (port) == TPAIR && TYPE (car (port)) == TNUMBER)
g_stdin = VALUE (CAR (port));
int c = readchar ();
size_t i = 0;
while (c != -1)
{
if (i > MAX_STRING)
assert_max_string (i, "read_string", g_buf);
g_buf[i++] = c;
c = readchar ();
}
g_buf[i] = 0;
g_stdin = fd;
return make_string (g_buf, i);
}
SCM
string_append (SCM x) ///((arity . n))
{
char *p = g_buf;
g_buf[0] = 0;
size_t size = 0;
while (x != cell_nil)
{
SCM string = CAR (x);
assert (TYPE (string) == TSTRING);
memcpy (p, CSTRING (string), LENGTH (string) + 1);
p += LENGTH (string);
size += LENGTH (string);
if (size > MAX_STRING)
assert_max_string (size, "string_append", g_buf);
x = CDR (x);
}
return make_string (g_buf, size);
}
SCM
string_length (SCM string)
{
assert (TYPE (string) == TSTRING);
return MAKE_NUMBER (LENGTH (string));
}
SCM
string_ref (SCM str, SCM k)
{
assert (TYPE (str) == TSTRING);
assert (TYPE (k) == TNUMBER);
size_t size = LENGTH (str);
size_t i = VALUE (k);
if (i > size)
error (cell_symbol_system_error, cons (MAKE_STRING0 ("value out of range"), k));
char const *p = CSTRING (str);
return MAKE_CHAR (p[i]);
}