ref: 6c42012d3d227941cfec46b77768b2d3e5891dea
dir: /iostream.c/
#include "llt.h"
#include "flisp.h"
#include "cvalues.h"
#include "types.h"
#include "print.h"
#include "read.h"
static value_t iostreamsym, rdsym, wrsym, apsym, crsym, truncsym;
static value_t instrsym, outstrsym;
fltype_t *iostreamtype;
void
print_iostream(value_t v, ios_t *f)
{
USED(v);
fl_print_str("#<io stream>", f);
}
void
free_iostream(value_t self)
{
ios_t *s = value2c(ios_t*, self);
ios_close(s);
}
void
relocate_iostream(value_t oldv, value_t newv)
{
ios_t *olds = value2c(ios_t*, oldv);
ios_t *news = value2c(ios_t*, newv);
if(news->buf == &olds->local[0])
news->buf = &news->local[0];
}
static cvtable_t iostream_vtable = {
print_iostream,
relocate_iostream,
free_iostream,
nil
};
int
fl_isiostream(value_t v)
{
return iscvalue(v) && cv_class(ptr(v)) == iostreamtype;
}
BUILTIN("iostream?", iostreamp)
{
argcount(nargs, 1);
return fl_isiostream(args[0]) ? FL_T : FL_F;
}
BUILTIN("eof-object", eof_object)
{
USED(args);
argcount(nargs, 0);
return FL_EOF;
}
BUILTIN("eof-object?", eof_objectp)
{
argcount(nargs, 1);
return args[0] == FL_EOF ? FL_T : FL_F;
}
ios_t *
fl_toiostream(value_t v)
{
if(!fl_isiostream(v))
type_error("iostream", v);
return value2c(ios_t*, v);
}
BUILTIN("file", file)
{
if(nargs < 1)
argcount(nargs, 1);
int i, r = 0, w = 0, c = 0, t = 0, a = 0;
for(i = 1; i < nargs; i++){
if(args[i] == rdsym)
r = 1;
else if(args[i] == wrsym)
w = 1;
else if(args[i] == apsym)
a = w = 1;
else if(args[i] == crsym)
c = w = 1;
else if(args[i] == truncsym)
t = w = 1;
}
if((r|w|c|t|a) == 0)
r = 1; // default to reading
value_t f = cvalue(iostreamtype, sizeof(ios_t));
char *fname = tostring(args[0]);
ios_t *s = value2c(ios_t*, f);
if(ios_file(s, fname, r, w, c, t) == nil)
lerrorf(IOError, "could not open \"%s\"", fname);
if(a)
ios_seek_end(s);
return f;
}
BUILTIN("buffer", buffer)
{
argcount(nargs, 0);
USED(args);
value_t f = cvalue(iostreamtype, sizeof(ios_t));
ios_t *s = value2c(ios_t*, f);
if(ios_mem(s, 0) == nil)
lerrorf(MemoryError, "could not allocate stream");
return f;
}
BUILTIN("read", read)
{
value_t arg = 0;
if(nargs > 1)
argcount(nargs, 1);
else if(nargs == 0)
arg = symbol_value(instrsym);
else
arg = args[0];
ios_t *s = fl_toiostream(arg);
fl_gc_handle(&arg);
value_t v = fl_read_sexpr(arg);
fl_free_gc_handles(1);
if(ios_eof(s))
return FL_EOF;
return v;
}
BUILTIN("io.getc", io_getc)
{
argcount(nargs, 1);
ios_t *s = fl_toiostream(args[0]);
uint32_t wc;
int res;
if((res = ios_getutf8(s, &wc)) == IOS_EOF)
//lerrorf(IOError, "end of file reached");
return FL_EOF;
if(res == 0)
lerrorf(IOError, "invalid UTF-8 sequence");
return mk_wchar(wc);
}
BUILTIN("io.peekc", io_peekc)
{
argcount(nargs, 1);
ios_t *s = fl_toiostream(args[0]);
uint32_t wc;
int res;
if((res = ios_peekutf8(s, &wc)) == IOS_EOF)
return FL_EOF;
if(res == 0)
lerrorf(IOError, "invalid UTF-8 sequence");
return mk_wchar(wc);
}
BUILTIN("io.putc", io_putc)
{
argcount(nargs, 2);
ios_t *s = fl_toiostream(args[0]);
if(!iscprim(args[1]) || ((cprim_t*)ptr(args[1]))->type != wchartype)
type_error("wchar", args[1]);
uint32_t wc = *(uint32_t*)cp_data((cprim_t*)ptr(args[1]));
return fixnum(ios_pututf8(s, wc));
}
BUILTIN("io.skip", io_skip)
{
argcount(nargs, 2);
ios_t *s = fl_toiostream(args[0]);
off_t off = tooffset(args[1]);
off_t res = ios_skip(s, off);
if(res < 0)
return FL_F;
return sizeof(res) == sizeof(int64_t) ? mk_int64(res) : mk_int32(res);
}
BUILTIN("io.flush", io_flush)
{
argcount(nargs, 1);
return ios_flush(fl_toiostream(args[0])) == 0 ? FL_T : FL_F;
}
BUILTIN("io.close", io_close)
{
argcount(nargs, 1);
ios_close(fl_toiostream(args[0]));
return FL_T;
}
BUILTIN("io.discardbuffer", io_discardbuffer)
{
argcount(nargs, 1);
ios_purge(fl_toiostream(args[0]));
return FL_T;
}
BUILTIN("io.eof?", io_eofp)
{
argcount(nargs, 1);
return ios_eof(fl_toiostream(args[0])) ? FL_T : FL_F;
}
BUILTIN("io.seek", io_seek)
{
argcount(nargs, 2);
ios_t *s = fl_toiostream(args[0]);
size_t pos = toulong(args[1]);
off_t res = ios_seek(s, (off_t)pos);
if(res == -1)
return FL_F;
return FL_T;
}
BUILTIN("io.pos", io_pos)
{
argcount(nargs, 1);
ios_t *s = fl_toiostream(args[0]);
off_t res = ios_pos(s);
if(res == -1)
return FL_F;
return size_wrap((size_t)res);
}
BUILTIN("write", write)
{
if(nargs < 1 || nargs > 2)
argcount(nargs, 1);
ios_t *s;
s = nargs == 2 ? fl_toiostream(args[1]) : fl_toiostream(symbol_value(outstrsym));
fl_print(s, args[0]);
return args[0];
}
BUILTIN("io.read", io_read)
{
if(nargs != 3)
argcount(nargs, 2);
ios_t *s = fl_toiostream(args[0]);
size_t n;
fltype_t *ft;
if(nargs == 3){
// form (io.read s type count)
ft = get_array_type(args[1]);
n = toulong(args[2]) * ft->elsz;
}else{
ft = get_type(args[1]);
if(ft->eltype != nil && !iscons(cdr_(cdr_(args[1]))))
lerrorf(ArgError, "incomplete type");
n = ft->size;
}
value_t cv = cvalue(ft, n);
char *data;
if(iscvalue(cv))
data = cv_data(ptr(cv));
else data = cp_data(ptr(cv));
size_t got = ios_read(s, data, n);
if(got < n)
//lerrorf(IOError, "end of input reached");
return FL_EOF;
return cv;
}
// args must contain data[, offset[, count]]
static void
get_start_count_args(value_t *args, uint32_t nargs, size_t sz, size_t *offs, size_t *nb)
{
if(nargs > 1){
*offs = toulong(args[1]);
*nb = nargs > 2 ? toulong(args[2]) : sz - *offs;
if(*offs >= sz || *offs + *nb > sz)
bounds_error(args[0], args[1]);
}
}
BUILTIN("io.write", io_write)
{
if(nargs < 2 || nargs > 4)
argcount(nargs, 2);
ios_t *s = fl_toiostream(args[0]);
if(iscprim(args[1]) && ((cprim_t*)ptr(args[1]))->type == wchartype){
if(nargs > 2)
lerrorf(ArgError, "offset argument not supported for characters");
uint32_t wc = *(uint32_t*)cp_data(ptr(args[1]));
return fixnum(ios_pututf8(s, wc));
}
char *data;
size_t sz, offs = 0;
to_sized_ptr(args[1], &data, &sz);
size_t nb = sz;
if(nargs > 2){
get_start_count_args(&args[1], nargs-1, sz, &offs, &nb);
data += offs;
}
return size_wrap(ios_write(s, data, nb));
}
BUILTIN("dump", dump)
{
if(nargs < 1 || nargs > 3)
argcount(nargs, 1);
ios_t *s = fl_toiostream(symbol_value(outstrsym));
char *data;
size_t sz, offs = 0;
to_sized_ptr(args[0], &data, &sz);
size_t nb = sz;
if(nargs > 1){
get_start_count_args(args, nargs, sz, &offs, &nb);
data += offs;
}
hexdump(s, data, nb, offs);
return FL_T;
}
static char
get_delim_arg(value_t arg)
{
size_t uldelim = toulong(arg);
if(uldelim > 0x7f){
// wchars > 0x7f, or anything else > 0xff, are out of range
if((iscprim(arg) && cp_class(ptr(arg)) == wchartype) || uldelim > 0xff)
lerrorf(ArgError, "delimiter out of range");
}
return (char)uldelim;
}
BUILTIN("io.readuntil", io_readuntil)
{
argcount(nargs, 2);
value_t str = cvalue_string(80);
cvalue_t *cv = ptr(str);
char *data = cv_data(cv);
ios_t dest;
ios_mem(&dest, 0);
ios_setbuf(&dest, data, 80, 0);
char delim = get_delim_arg(args[1]);
ios_t *src = fl_toiostream(args[0]);
size_t n = ios_copyuntil(&dest, src, delim);
cv->len = n;
if(dest.buf != data){
// outgrew initial space
size_t sz;
cv->data = ios_takebuf(&dest, &sz);
#ifndef BOEHM_GC
cv_autorelease(cv);
#endif
}else{
((char*)cv->data)[n] = '\0';
}
if(n == 0 && ios_eof(src))
return FL_EOF;
return str;
}
BUILTIN("io.copyuntil", io_copyuntil)
{
argcount(nargs, 3);
ios_t *dest = fl_toiostream(args[0]);
ios_t *src = fl_toiostream(args[1]);
char delim = get_delim_arg(args[2]);
return size_wrap(ios_copyuntil(dest, src, delim));
}
BUILTIN("io.copy", io_copy)
{
if(nargs < 2 || nargs > 3)
argcount(nargs, 2);
ios_t *dest = fl_toiostream(args[0]);
ios_t *src = fl_toiostream(args[1]);
if(nargs == 3)
return size_wrap(ios_copy(dest, src, toulong(args[2])));
return size_wrap(ios_copyall(dest, src));
}
value_t
stream_to_string(value_t *ps)
{
value_t str;
size_t n;
ios_t *st = value2c(ios_t*, *ps);
if(st->buf == &st->local[0]){
n = st->size;
str = cvalue_string(n);
memmove(cvalue_data(str), st->buf, n);
ios_trunc(st, 0);
}else{
char *b = ios_takebuf(st, &n); n--;
b[n] = '\0';
str = cvalue_from_ref(stringtype, b, n, FL_NIL);
#ifndef BOEHM_GC
cv_autorelease(ptr(str));
#endif
}
return str;
}
BUILTIN("io.tostring!", io_tostring)
{
argcount(nargs, 1);
ios_t *src = fl_toiostream(args[0]);
if(src->bm != bm_mem)
lerrorf(ArgError, "requires memory stream");
return stream_to_string(&args[0]);
}
void
iostream_init(void)
{
iostreamsym = symbol("iostream");
rdsym = symbol(":read");
wrsym = symbol(":write");
apsym = symbol(":append");
crsym = symbol(":create");
truncsym = symbol(":truncate");
instrsym = symbol("*input-stream*");
outstrsym = symbol("*output-stream*");
iostreamtype = define_opaque_type(iostreamsym, sizeof(ios_t), &iostream_vtable, nil);
setc(symbol("*stdout*"), cvalue_from_ref(iostreamtype, ios_stdout, sizeof(ios_t), FL_NIL));
setc(symbol("*stderr*"), cvalue_from_ref(iostreamtype, ios_stderr, sizeof(ios_t), FL_NIL));
setc(symbol("*stdin*" ), cvalue_from_ref(iostreamtype, ios_stdin, sizeof(ios_t), FL_NIL));
}