ref: b76bbe37247399331e39bfbbef8724bb2520065d
dir: /femtolisp/builtins.c/
/*
Extra femtoLisp builtin functions
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <setjmp.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/time.h>
#include <errno.h>
#include "llt.h"
#include "flisp.h"
size_t llength(value_t v)
{
size_t n = 0;
while (iscons(v)) {
n++;
v = cdr_(v);
}
return n;
}
value_t list_nth(value_t l, size_t n)
{
while (n && iscons(l)) {
l = cdr_(l);
n--;
}
if (iscons(l)) return car_(l);
return NIL;
}
value_t fl_print(value_t *args, u_int32_t nargs)
{
unsigned i;
for (i=0; i < nargs; i++)
print(stdout, args[i], 0);
fputc('\n', stdout);
return nargs ? args[nargs-1] : NIL;
}
value_t fl_princ(value_t *args, u_int32_t nargs)
{
unsigned i;
for (i=0; i < nargs; i++)
print(stdout, args[i], 1);
return nargs ? args[nargs-1] : NIL;
}
value_t fl_read(value_t *args, u_int32_t nargs)
{
(void)args;
argcount("read", nargs, 0);
return read_sexpr(stdin);
}
value_t fl_load(value_t *args, u_int32_t nargs)
{
argcount("load", nargs, 1);
return load_file(tostring(args[0], "load"));
}
value_t fl_exit(value_t *args, u_int32_t nargs)
{
if (nargs > 0)
exit(tofixnum(args[0], "exit"));
exit(0);
return NIL;
}
extern value_t LAMBDA;
value_t fl_setsyntax(value_t *args, u_int32_t nargs)
{
argcount("set-syntax", nargs, 2);
symbol_t *sym = tosymbol(args[0], "set-syntax");
if (sym->syntax && (sym->syntax == TAG_CONST || isspecial(sym->syntax)))
lerror(ArgError, "set-syntax: cannot define syntax for %s",
symbol_name(args[0]));
if (args[1] == NIL) {
sym->syntax = 0;
}
else {
if (!iscons(args[1]) || car_(args[1])!=LAMBDA)
type_error("set-syntax", "function", args[1]);
sym->syntax = args[1];
}
return args[1];
}
value_t fl_symbolsyntax(value_t *args, u_int32_t nargs)
{
argcount("symbol-syntax", nargs, 1);
symbol_t *sym = tosymbol(args[0], "symbol-syntax");
// must avoid returning built-in syntax expanders, because they
// don't behave like functions (they take their arguments directly
// from the form rather than from the stack of evaluated arguments)
if (sym->syntax == TAG_CONST || isspecial(sym->syntax))
return NIL;
return sym->syntax;
}
static void syntax_env_assoc_list(symbol_t *root, value_t *pv)
{
while (root != NULL) {
if (root->syntax && root->syntax != TAG_CONST &&
!isspecial(root->syntax)) {
PUSH(fl_cons(tagptr(root,TAG_SYM), root->syntax));
*pv = fl_cons(POP(), *pv);
}
syntax_env_assoc_list(root->left, pv);
root = root->right;
}
}
static void global_env_assoc_list(symbol_t *root, value_t *pv)
{
while (root != NULL) {
if (root->binding != UNBOUND) {
PUSH(fl_cons(tagptr(root,TAG_SYM), root->binding));
*pv = fl_cons(POP(), *pv);
}
global_env_assoc_list(root->left, pv);
root = root->right;
}
}
extern symbol_t *symtab;
value_t fl_syntax_env(value_t *args, u_int32_t nargs)
{
(void)args;
argcount("syntax-environment", nargs, 0);
PUSH(NIL);
syntax_env_assoc_list(symtab, &Stack[SP-1]);
return POP();
}
value_t fl_global_env(value_t *args, u_int32_t nargs)
{
(void)args;
argcount("environment", nargs, 0);
PUSH(NIL);
global_env_assoc_list(symtab, &Stack[SP-1]);
return POP();
}
value_t fl_constantp(value_t *args, u_int32_t nargs)
{
argcount("constantp", nargs, 1);
if (issymbol(args[0]))
return (isconstant(args[0]) ? T : NIL);
if (iscons(args[0]))
return NIL;
return T;
}
value_t fl_fixnum(value_t *args, u_int32_t nargs)
{
argcount("fixnum", nargs, 1);
if (isfixnum(args[0]))
return args[0];
if (iscvalue(args[0])) {
cvalue_t *cv = (cvalue_t*)ptr(args[0]);
long i;
if (cv->flags.cstring) {
char *pend;
errno = 0;
i = strtol(cv_data(cv), &pend, 0);
if (*pend != '\0' || errno!=0)
lerror(ArgError, "fixnum: invalid string");
return fixnum(i);
}
else if (valid_numtype(cv_numtype(cv))) {
i = conv_to_long(cv_data(cv), cv_numtype(cv));
return fixnum(i);
}
}
lerror(ArgError, "fixnum: cannot convert argument");
}
value_t fl_truncate(value_t *args, u_int32_t nargs)
{
argcount("truncate", nargs, 1);
if (isfixnum(args[0]))
return args[0];
if (iscvalue(args[0])) {
cvalue_t *cv = (cvalue_t*)ptr(args[0]);
void *data = cv_data(cv);
numerictype_t nt = cv_numtype(cv);
if (valid_numtype(nt)) {
double d;
if (nt == T_FLOAT)
d = (double)*(float*)data;
else if (nt == T_DOUBLE)
d = *(double*)data;
else
return args[0];
if (d > 0)
return return_from_uint64((uint64_t)d);
return return_from_int64((int64_t)d);
}
}
type_error("truncate", "number", args[0]);
}
value_t fl_vector_alloc(value_t *args, u_int32_t nargs)
{
fixnum_t i;
value_t f, v;
if (nargs == 0)
lerror(ArgError, "vector.alloc: too few arguments");
i = tofixnum(args[0], "vector.alloc");
if (i < 0)
lerror(ArgError, "vector.alloc: invalid size");
if (nargs == 2)
f = args[1];
else
f = NIL;
v = alloc_vector((unsigned)i, f==NIL);
if (f != NIL) {
int k;
for(k=0; k < i; k++)
vector_elt(v,k) = f;
}
return v;
}
int isstring(value_t v)
{
return (iscvalue(v) && ((cvalue_t*)ptr(v))->flags.cstring);
}
value_t fl_intern(value_t *args, u_int32_t nargs)
{
argcount("intern", nargs, 1);
if (!isstring(args[0]))
type_error("intern", "string", args[0]);
return symbol(cvalue_data(args[0]));
}
value_t fl_stringp(value_t *args, u_int32_t nargs)
{
argcount("stringp", nargs, 1);
return isstring(args[0]) ? T : NIL;
}
value_t fl_string_length(value_t *args, u_int32_t nargs)
{
argcount("string.length", nargs, 1);
if (!isstring(args[0]))
type_error("string.length", "string", args[0]);
size_t len = cv_len((cvalue_t*)ptr(args[0]));
return size_wrap(u8_charnum(cvalue_data(args[0]), len));
}
value_t fl_string_reverse(value_t *args, u_int32_t nargs)
{
argcount("string.reverse", nargs, 1);
if (!isstring(args[0]))
type_error("string.reverse", "string", args[0]);
size_t len = cv_len((cvalue_t*)ptr(args[0]));
value_t ns = cvalue_string(len);
u8_reverse(cvalue_data(ns), cvalue_data(args[0]), len);
return ns;
}
value_t fl_string_encode(value_t *args, u_int32_t nargs)
{
argcount("string.encode", nargs, 1);
if (iscvalue(args[0])) {
cvalue_t *cv = (cvalue_t*)ptr(args[0]);
value_t t = cv_type(cv);
if (iscons(t) && car_(t) == arraysym &&
iscons(cdr_(t)) && car_(cdr_(t)) == wcharsym) {
size_t nc = cv_len(cv) / sizeof(uint32_t);
uint32_t *ptr = (uint32_t*)cv_data(cv);
size_t nbytes = u8_codingsize(ptr, nc);
value_t str = cvalue_string(nbytes);
ptr = cv_data((cvalue_t*)ptr(args[0])); // relocatable pointer
u8_toutf8(cvalue_data(str), nbytes, ptr, nc);
return str;
}
}
type_error("string.encode", "wide character array", args[0]);
}
value_t fl_string_decode(value_t *args, u_int32_t nargs)
{
int term=0;
if (nargs == 2) {
term = (POP() != NIL);
nargs--;
}
argcount("string.decode", nargs, 1);
if (!isstring(args[0]))
type_error("string.decode", "string", args[0]);
cvalue_t *cv = (cvalue_t*)ptr(args[0]);
char *ptr = (char*)cv_data(cv);
size_t nb = cv_len(cv);
size_t nc = u8_charnum(ptr, nb);
size_t newsz = nc*sizeof(uint32_t);
if (term) newsz += sizeof(uint32_t);
value_t wcstr = cvalue(symbol_value(wcstringtypesym), newsz);
ptr = cv_data((cvalue_t*)ptr(args[0])); // relocatable pointer
uint32_t *pwc = cvalue_data(wcstr);
u8_toucs(pwc, nc, ptr, nb);
if (term) pwc[nc] = 0;
return wcstr;
}
value_t fl_string(value_t *args, u_int32_t nargs)
{
value_t cv, t;
u_int32_t i;
size_t len, sz = 0;
cvalue_t *temp;
char *data;
wchar_t wc;
for(i=0; i < nargs; i++) {
if (issymbol(args[i])) {
sz += strlen(symbol_name(args[i]));
continue;
}
else if (iscvalue(args[i])) {
temp = (cvalue_t*)ptr(args[i]);
t = cv_type(temp);
if (t == charsym) {
sz++;
continue;
}
else if (t == wcharsym) {
wc = *(wchar_t*)cv_data(temp);
sz += u8_charlen(wc);
continue;
}
else if (temp->flags.cstring) {
sz += cv_len(temp);
continue;
}
}
lerror(ArgError, "string: expected string, symbol or character");
}
cv = cvalue_string(sz);
char *ptr = cvalue_data(cv);
for(i=0; i < nargs; i++) {
if (issymbol(args[i])) {
char *name = symbol_name(args[i]);
while (*name) *ptr++ = *name++;
}
else {
temp = (cvalue_t*)ptr(args[i]);
t = cv_type(temp);
data = cvalue_data(args[i]);
if (t == charsym) {
*ptr++ = *(char*)data;
}
else if (t == wcharsym) {
ptr += u8_wc_toutf8(ptr, *(wchar_t*)data);
}
else {
len = cv_len(temp);
memcpy(ptr, data, len);
ptr += len;
}
}
}
return cv;
}
value_t fl_string_split(value_t *args, u_int32_t nargs)
{
argcount("string.split", nargs, 2);
char *s = tostring(args[0], "string.split");
char *delim = tostring(args[1], "string.split");
size_t len = cv_len((cvalue_t*)ptr(args[0]));
size_t dlen = cv_len((cvalue_t*)ptr(args[1]));
PUSH(NIL);
size_t ssz, tokend=0, tokstart=0, i=0;
value_t c=NIL;
size_t junk;
do {
// find and allocate next token
tokstart = tokend = i;
while (i < len &&
!u8_memchr(delim, u8_nextmemchar(s, &i), dlen, &junk))
tokend = i;
ssz = tokend - tokstart;
PUSH(c); // save previous cons cell
c = fl_cons(cvalue_string(ssz), NIL);
// we've done allocation; reload movable pointers
s = cv_data((cvalue_t*)ptr(args[0]));
delim = cv_data((cvalue_t*)ptr(args[1]));
if (ssz) memcpy(cv_data((cvalue_t*)ptr(car_(c))), &s[tokstart], ssz);
// link new cell
if (Stack[SP-1] == NIL) {
Stack[SP-2] = c; // first time, save first cons
(void)POP();
}
else {
((cons_t*)ptr(POP()))->cdr = c;
}
// note this tricky condition: if the string ends with a
// delimiter, we need to go around one more time to add an
// empty string. this happens when (i==len && tokend<i)
} while (i < len || (i==len && (tokend!=i)));
return POP();
}
value_t fl_string_sub(value_t *args, u_int32_t nargs)
{
argcount("string.sub", nargs, 3);
char *s = tostring(args[0], "string.sub");
size_t len = cv_len((cvalue_t*)ptr(args[0]));
size_t i1, i2;
i1 = toulong(args[1], "string.sub");
if (i1 > len)
bounds_error("string.sub", args[0], args[1]);
i2 = toulong(args[2], "string.sub");
if (i2 > len)
bounds_error("string.sub", args[0], args[2]);
if (i2 <= i1)
return cvalue_string(0);
value_t ns = cvalue_string(i2-i1);
memcpy(cv_data((cvalue_t*)ptr(ns)), &s[i1], i2-i1);
return ns;
}
value_t fl_time_now(value_t *args, u_int32_t nargs)
{
argcount("time.now", nargs, 0);
(void)args;
return mk_double(clock_now());
}
static double value_to_double(value_t a, char *fname)
{
if (isfixnum(a))
return (double)numval(a);
if (iscvalue(a)) {
cvalue_t *cv = (cvalue_t*)ptr(a);
numerictype_t nt = cv_numtype(cv);
if (valid_numtype(nt))
return conv_to_double(cv_data(cv), nt);
}
type_error(fname, "number", a);
}
static value_t return_from_cstr(char *str)
{
size_t n = strlen(str);
value_t v = cvalue_string(n);
memcpy(cvalue_data(v), str, n);
return v;
}
value_t fl_time_string(value_t *args, uint32_t nargs)
{
argcount("time.string", nargs, 1);
double t = value_to_double(args[0], "time.string");
char buf[64];
timestring(t, buf, sizeof(buf));
return return_from_cstr(buf);
}
value_t fl_path_cwd(value_t *args, uint32_t nargs)
{
if (nargs > 1)
argcount("path.cwd", nargs, 1);
if (nargs == 0) {
char buf[1024];
get_cwd(buf, sizeof(buf));
return return_from_cstr(buf);
}
char *ptr = tostring(args[0], "path.cwd");
if (set_cwd(ptr))
lerror(IOError, "could not cd to %s", ptr);
return T;
}
value_t fl_os_getenv(value_t *args, uint32_t nargs)
{
argcount("os.getenv", nargs, 1);
char *name = tostring(args[0], "os.getenv");
char *val = getenv(name);
if (val == NULL) return NIL;
if (*val == 0)
return symbol_value(emptystringsym);
return cvalue_pinned_cstring(val);
}
value_t fl_os_setenv(value_t *args, uint32_t nargs)
{
argcount("os.setenv", nargs, 2);
char *name = tostring(args[0], "os.setenv");
int result;
if (args[1] == NIL) {
result = unsetenv(name);
}
else {
char *val = tostring(args[1], "os.setenv");
result = setenv(name, val, 1);
}
if (result != 0)
lerror(ArgError, "os.setenv: invalid environment variable");
return T;
}
value_t fl_rand(value_t *args, u_int32_t nargs)
{
(void)args;
(void)nargs;
return fixnum(random()&0x1fffffff);
}
value_t fl_rand32(value_t *args, u_int32_t nargs)
{
(void)args;
(void)nargs;
return mk_uint32(random());
}
value_t fl_rand64(value_t *args, u_int32_t nargs)
{
(void)args;
(void)nargs;
return mk_uint64(((uint64_t)random())<<32 | ((uint64_t)random()));
}
value_t fl_randd(value_t *args, u_int32_t nargs)
{
(void)args;
(void)nargs;
return mk_double(rand_double());
}
void builtins_init()
{
set(symbol("set-syntax"), guestfunc(fl_setsyntax));
set(symbol("symbol-syntax"), guestfunc(fl_symbolsyntax));
set(symbol("syntax-environment"), guestfunc(fl_syntax_env));
set(symbol("environment"), guestfunc(fl_global_env));
set(symbol("constantp"), guestfunc(fl_constantp));
set(symbol("print"), guestfunc(fl_print));
set(symbol("princ"), guestfunc(fl_princ));
set(symbol("read"), guestfunc(fl_read));
set(symbol("load"), guestfunc(fl_load));
set(symbol("exit"), guestfunc(fl_exit));
set(symbol("intern"), guestfunc(fl_intern));
set(symbol("fixnum"), guestfunc(fl_fixnum));
set(symbol("truncate"), guestfunc(fl_truncate));
set(symbol("vector.alloc"), guestfunc(fl_vector_alloc));
set(symbol("string"), guestfunc(fl_string));
set(symbol("stringp"), guestfunc(fl_stringp));
set(symbol("string.length"), guestfunc(fl_string_length));
set(symbol("string.split"), guestfunc(fl_string_split));
set(symbol("string.sub"), guestfunc(fl_string_sub));
set(symbol("string.reverse"), guestfunc(fl_string_reverse));
set(symbol("string.encode"), guestfunc(fl_string_encode));
set(symbol("string.decode"), guestfunc(fl_string_decode));
set(symbol("time.now"), guestfunc(fl_time_now));
set(symbol("time.string"), guestfunc(fl_time_string));
set(symbol("rand"), guestfunc(fl_rand));
set(symbol("rand.uint32"), guestfunc(fl_rand32));
set(symbol("rand.uint64"), guestfunc(fl_rand64));
set(symbol("rand.double"), guestfunc(fl_randd));
set(symbol("path.cwd"), guestfunc(fl_path_cwd));
set(symbol("os.getenv"), guestfunc(fl_os_getenv));
set(symbol("os.setenv"), guestfunc(fl_os_setenv));
}