ref: db94d6ef1f745bfc50211a20c0e4b3553bff72b0
dir: /femtolisp/iostream.c/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include "llt.h"
#include "flisp.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)
{
(void)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);
cvalue_t *cv = (cvalue_t*)ptr(oldv);
if (isinlined(cv)) {
if (olds->buf == &olds->local[0]) {
news->buf = &news->local[0];
}
}
}
cvtable_t iostream_vtable = { print_iostream, relocate_iostream,
free_iostream, NULL };
int isiostream(value_t v)
{
return iscvalue(v) && cv_class((cvalue_t*)ptr(v)) == iostreamtype;
}
value_t fl_iostreamp(value_t *args, uint32_t nargs)
{
argcount("iostream?", nargs, 1);
return isiostream(args[0]) ? FL_T : FL_F;
}
static ios_t *toiostream(value_t v, char *fname)
{
if (!isiostream(v))
type_error(fname, "iostream", v);
return value2c(ios_t*, v);
}
value_t fl_file(value_t *args, uint32_t nargs)
{
if (nargs < 1)
argcount("file", nargs, 1);
int i, r=0, w=0, c=0, t=0, a=0;
for(i=1; i < (int)nargs; i++) {
if (args[i] == wrsym) w = 1;
else if (args[i] == apsym) { a = 1; w = 1; }
else if (args[i] == crsym) { c = 1; w = 1; }
else if (args[i] == truncsym) { t = 1; w = 1; }
else if (args[i] == rdsym) r = 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], "file");
ios_t *s = value2c(ios_t*, f);
if (ios_file(s, fname, r, w, c, t) == NULL)
lerrorf(IOError, "file: could not open \"%s\"", fname);
if (a) ios_seek_end(s);
return f;
}
value_t fl_buffer(value_t *args, u_int32_t nargs)
{
argcount("buffer", nargs, 0);
(void)args;
value_t f = cvalue(iostreamtype, sizeof(ios_t));
ios_t *s = value2c(ios_t*, f);
if (ios_mem(s, 0) == NULL)
lerror(MemoryError, "buffer: could not allocate stream");
return f;
}
value_t fl_read(value_t *args, u_int32_t nargs)
{
value_t arg;
if (nargs > 1) {
argcount("read", nargs, 1);
}
else if (nargs == 0) {
arg = symbol_value(instrsym);
}
else {
arg = args[0];
}
(void)toiostream(arg, "read");
return read_sexpr(arg);
}
value_t fl_iogetc(value_t *args, u_int32_t nargs)
{
argcount("io.getc", nargs, 1);
ios_t *s = toiostream(args[0], "io.getc");
uint32_t wc;
if (ios_getutf8(s, &wc) == IOS_EOF)
lerror(IOError, "io.getc: end of file reached");
return mk_wchar(wc);
}
value_t fl_ioputc(value_t *args, u_int32_t nargs)
{
argcount("io.putc", nargs, 2);
ios_t *s = toiostream(args[0], "io.putc");
if (!iscprim(args[1]) || ((cprim_t*)ptr(args[1]))->type != wchartype)
type_error("io.putc", "wchar", args[1]);
uint32_t wc = *(uint32_t*)cp_data((cprim_t*)ptr(args[1]));
return fixnum(ios_pututf8(s, wc));
}
value_t fl_ioflush(value_t *args, u_int32_t nargs)
{
argcount("io.flush", nargs, 1);
ios_t *s = toiostream(args[0], "io.flush");
if (ios_flush(s) != 0)
return FL_F;
return FL_T;
}
value_t fl_ioclose(value_t *args, u_int32_t nargs)
{
argcount("io.close", nargs, 1);
ios_t *s = toiostream(args[0], "io.close");
ios_close(s);
return FL_T;
}
value_t fl_iopurge(value_t *args, u_int32_t nargs)
{
argcount("io.discardbuffer", nargs, 1);
ios_t *s = toiostream(args[0], "io.discardbuffer");
ios_purge(s);
return FL_T;
}
value_t fl_ioeof(value_t *args, u_int32_t nargs)
{
argcount("io.eof?", nargs, 1);
ios_t *s = toiostream(args[0], "io.eof?");
return (ios_eof(s) ? FL_T : FL_F);
}
value_t fl_ioseek(value_t *args, u_int32_t nargs)
{
argcount("io.seek", nargs, 2);
ios_t *s = toiostream(args[0], "io.seek");
size_t pos = toulong(args[1], "io.seek");
off_t res = ios_seek(s, (off_t)pos);
if (res == -1)
return FL_F;
return FL_T;
}
value_t fl_iopos(value_t *args, u_int32_t nargs)
{
argcount("io.pos", nargs, 1);
ios_t *s = toiostream(args[0], "io.pos");
off_t res = ios_pos(s);
if (res == -1)
return FL_F;
return size_wrap((size_t)res);
}
value_t fl_write(value_t *args, u_int32_t nargs)
{
if (nargs < 1 || nargs > 2)
argcount("write", nargs, 1);
ios_t *s;
if (nargs == 2)
s = toiostream(args[1], "write");
else
s = toiostream(symbol_value(outstrsym), "write");
print(s, args[0]);
return args[0];
}
value_t fl_ioread(value_t *args, u_int32_t nargs)
{
if (nargs != 3)
argcount("io.read", nargs, 2);
(void)toiostream(args[0], "io.read");
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], "io.read") * ft->elsz;
}
else {
ft = get_type(args[1]);
if (ft->eltype != NULL && !iscons(cdr_(cdr_(args[1]))))
lerror(ArgError, "io.read: incomplete type");
n = ft->size;
}
value_t cv = cvalue(ft, n);
char *data;
if (iscvalue(cv)) data = cv_data((cvalue_t*)ptr(cv));
else data = cp_data((cprim_t*)ptr(cv));
size_t got = ios_read(value2c(ios_t*,args[0]), data, n);
if (got < n)
lerror(IOError, "io.read: end of input reached");
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, char *fname)
{
if (nargs > 1) {
*offs = toulong(args[1], fname);
if (nargs > 2)
*nb = toulong(args[2], fname);
else
*nb = sz - *offs;
if (*offs >= sz || *offs + *nb > sz)
bounds_error(fname, args[0], args[1]);
}
}
value_t fl_iowrite(value_t *args, u_int32_t nargs)
{
if (nargs < 2 || nargs > 4)
argcount("io.write", nargs, 2);
ios_t *s = toiostream(args[0], "io.write");
if (iscprim(args[1]) && ((cprim_t*)ptr(args[1]))->type == wchartype) {
if (nargs > 2)
lerror(ArgError,
"io.write: offset argument not supported for characters");
uint32_t wc = *(uint32_t*)cp_data((cprim_t*)ptr(args[1]));
return fixnum(ios_pututf8(s, wc));
}
char *data;
size_t sz, offs=0;
to_sized_ptr(args[1], "io.write", &data, &sz);
size_t nb = sz;
if (nargs > 2) {
get_start_count_args(&args[1], nargs-1, sz, &offs, &nb, "io.write");
data += offs;
}
return size_wrap(ios_write(s, data, nb));
}
value_t fl_dump(value_t *args, u_int32_t nargs)
{
if (nargs < 1 || nargs > 3)
argcount("dump", nargs, 1);
ios_t *s = toiostream(symbol_value(outstrsym), "dump");
char *data;
size_t sz, offs=0;
to_sized_ptr(args[0], "dump", &data, &sz);
size_t nb = sz;
if (nargs > 1) {
get_start_count_args(args, nargs, sz, &offs, &nb, "dump");
data += offs;
}
hexdump(s, data, nb, offs);
return FL_T;
}
static char get_delim_arg(value_t arg, char *fname)
{
size_t uldelim = toulong(arg, fname);
if (uldelim > 0x7f) {
// wchars > 0x7f, or anything else > 0xff, are out of range
if ((iscprim(arg) && cp_class((cprim_t*)ptr(arg))==wchartype) ||
uldelim > 0xff)
lerrorf(ArgError, "%s: delimiter out of range", fname);
}
return (char)uldelim;
}
value_t fl_ioreaduntil(value_t *args, u_int32_t nargs)
{
argcount("io.readuntil", nargs, 2);
value_t str = cvalue_string(80);
cvalue_t *cv = (cvalue_t*)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], "io.readuntil");
ios_t *src = toiostream(args[0], "io.readuntil");
size_t n = ios_copyuntil(&dest, src, delim);
cv->len = n;
if (dest.buf != data) {
// outgrew initial space
cv->data = dest.buf;
cv_autorelease(cv);
}
((char*)cv->data)[n] = '\0';
if (n == 0 && ios_eof(src))
return FL_F;
return str;
}
value_t fl_iocopyuntil(value_t *args, u_int32_t nargs)
{
argcount("io.copyuntil", nargs, 3);
ios_t *dest = toiostream(args[0], "io.copyuntil");
ios_t *src = toiostream(args[1], "io.copyuntil");
char delim = get_delim_arg(args[2], "io.copyuntil");
return size_wrap(ios_copyuntil(dest, src, delim));
}
value_t fl_iocopy(value_t *args, u_int32_t nargs)
{
if (nargs < 2 || nargs > 3)
argcount("io.copy", nargs, 2);
ios_t *dest = toiostream(args[0], "io.copy");
ios_t *src = toiostream(args[1], "io.copy");
if (nargs == 3) {
size_t n = toulong(args[2], "io.copy");
return size_wrap(ios_copy(dest, src, n));
}
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);
memcpy(cvalue_data(str), value2c(ios_t*,*ps)->buf, n);
}
else {
char *b = ios_takebuf(st, &n); n--;
b[n] = '\0';
str = cvalue_from_ref(stringtype, b, n, NIL);
cv_autorelease((cvalue_t*)ptr(str));
}
return str;
}
value_t fl_iotostring(value_t *args, u_int32_t nargs)
{
argcount("io.tostring!", nargs, 1);
ios_t *src = toiostream(args[0], "io.tostring!");
if (src->bm != bm_mem)
lerror(ArgError, "io.tostring!: requires memory stream");
return stream_to_string(&args[0]);
}
static builtinspec_t iostreamfunc_info[] = {
{ "iostream?", fl_iostreamp },
{ "dump", fl_dump },
{ "file", fl_file },
{ "buffer", fl_buffer },
{ "read", fl_read },
{ "write", fl_write },
{ "io.flush", fl_ioflush },
{ "io.close", fl_ioclose },
{ "io.eof?" , fl_ioeof },
{ "io.seek" , fl_ioseek },
{ "io.pos", fl_iopos },
{ "io.getc" , fl_iogetc },
{ "io.putc" , fl_ioputc },
{ "io.discardbuffer", fl_iopurge },
{ "io.read", fl_ioread },
{ "io.write", fl_iowrite },
{ "io.copy", fl_iocopy },
{ "io.readuntil", fl_ioreaduntil },
{ "io.copyuntil", fl_iocopyuntil },
{ "io.tostring!", fl_iotostring },
{ NULL, NULL }
};
void iostream_init()
{
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, NULL);
assign_global_builtins(iostreamfunc_info);
setc(symbol("*stdout*"), cvalue_from_ref(iostreamtype, ios_stdout,
sizeof(ios_t), NIL));
setc(symbol("*stderr*"), cvalue_from_ref(iostreamtype, ios_stderr,
sizeof(ios_t), NIL));
setc(symbol("*stdin*" ), cvalue_from_ref(iostreamtype, ios_stdin,
sizeof(ios_t), NIL));
}