-/*
- * Copyright © 2018 Keith Packard <keithp@keithp.com>
- *
- * 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 of the License, 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.
- */
-
-#include "ao_scheme.h"
-
-#ifdef AO_SCHEME_FEATURE_PORT
-
-static void port_mark(void *addr)
-{
- (void) addr;
-}
-
-static int port_size(void *addr)
-{
- (void) addr;
- return sizeof(struct ao_scheme_port);
-}
-
-static void port_move(void *addr)
-{
- struct ao_scheme_port *port = addr;
-
- (void) ao_scheme_poly_move(&port->next, 0);
-}
-
-const struct ao_scheme_type ao_scheme_port_type = {
- .mark = port_mark,
- .size = port_size,
- .move = port_move,
- .name = "port",
-};
-
-void
-ao_scheme_port_write(FILE *out, ao_poly v, bool write)
-{
- (void) write;
- ao_scheme_fprintf(out, "#port<%d>", fileno(ao_scheme_poly_port(v)->file));
-}
-
-ao_poly ao_scheme_stdin, ao_scheme_stdout, ao_scheme_stderr;
-
-ao_poly ao_scheme_open_ports;
-
-void
-ao_scheme_port_check_references(void)
-{
- struct ao_scheme_port *p;
-
- for (p = ao_scheme_poly_port(ao_scheme_open_ports); p; p = ao_scheme_poly_port(p->next)) {
- if (!ao_scheme_marked(p))
- ao_scheme_port_close(p);
- }
-}
-
-struct ao_scheme_port *
-ao_scheme_port_alloc(FILE *file, bool stayopen)
-{
- struct ao_scheme_port *p;
-
- p = ao_scheme_alloc(sizeof (struct ao_scheme_port));
- if (!p)
- return NULL;
- p->type = AO_SCHEME_PORT;
- p->stayopen = stayopen;
- p->file = file;
- p->next = ao_scheme_open_ports;
- ao_scheme_open_ports = ao_scheme_port_poly(p);
- return p;
-}
-
-void
-ao_scheme_port_close(struct ao_scheme_port *port)
-{
- ao_poly *prev;
- struct ao_scheme_port *ref;
-
- if (port->file && !port->stayopen) {
- fclose(port->file);
- port->file = NULL;
- for (prev = &ao_scheme_open_ports; (ref = ao_scheme_poly_port(*prev)); prev = &ref->next)
- if (ref == port) {
- *prev = port->next;
- break;
- }
- }
-}
-
-ao_poly
-ao_scheme_do_portp(struct ao_scheme_cons *cons)
-{
- return ao_scheme_do_typep(_ao_scheme_atom_port3f, AO_SCHEME_PORT, cons);
-}
-
-ao_poly
-ao_scheme_do_port_openp(struct ao_scheme_cons *cons)
-{
- struct ao_scheme_port *port;
-
- if (!ao_scheme_parse_args(_ao_scheme_atom_port2dopen3f, cons,
- AO_SCHEME_PORT, &port,
- AO_SCHEME_ARG_END))
- return AO_SCHEME_NIL;
- return port->file ? _ao_scheme_bool_true : _ao_scheme_bool_false;
-}
-
-static ao_poly
-ao_scheme_do_open_file(ao_poly proc, struct ao_scheme_cons *cons, const char *mode)
-{
- FILE *file;
- struct ao_scheme_string *name;
-
- if (!ao_scheme_parse_args(proc, cons,
- AO_SCHEME_STRING, &name,
- AO_SCHEME_ARG_END))
- return AO_SCHEME_NIL;
- file = fopen(name->val, mode);
- if (!file)
- return ao_scheme_error(AO_SCHEME_FILEERROR,
- "%v: no such file \"%v\"",
- proc, name);
- return ao_scheme_port_poly(ao_scheme_port_alloc(file, false));
-}
-
-ao_poly
-ao_scheme_do_open_input_file(struct ao_scheme_cons *cons)
-{
- return ao_scheme_do_open_file(_ao_scheme_atom_open2dinput2dfile, cons, "r");
-}
-
-ao_poly
-ao_scheme_do_open_output_file(struct ao_scheme_cons *cons)
-{
- return ao_scheme_do_open_file(_ao_scheme_atom_open2doutput2dfile, cons, "w");
-}
-
-ao_poly
-ao_scheme_do_close_port(struct ao_scheme_cons *cons)
-{
- struct ao_scheme_port *port;
-
- if (!ao_scheme_parse_args(_ao_scheme_atom_port2dopen3f, cons,
- AO_SCHEME_PORT, &port,
- AO_SCHEME_ARG_END))
- return AO_SCHEME_NIL;
- ao_scheme_port_close(port);
- return _ao_scheme_bool_true;
-}
-
-ao_poly
-ao_scheme_do_current_input_port(struct ao_scheme_cons *cons)
-{
- if (!ao_scheme_parse_args(_ao_scheme_atom_current2dinput2dport, cons,
- AO_SCHEME_ARG_END))
- return AO_SCHEME_NIL;
- if (!ao_scheme_stdin)
- ao_scheme_stdin = ao_scheme_port_poly(ao_scheme_port_alloc(stdin, true));
- return ao_scheme_stdin;
-}
-
-ao_poly
-ao_scheme_do_current_output_port(struct ao_scheme_cons *cons)
-{
- if (!ao_scheme_parse_args(_ao_scheme_atom_current2doutput2dport, cons,
- AO_SCHEME_ARG_END))
- return AO_SCHEME_NIL;
- if (!ao_scheme_stdout)
- ao_scheme_stdout = ao_scheme_port_poly(ao_scheme_port_alloc(stdout, true));
- return ao_scheme_stdout;
-}
-
-ao_poly
-ao_scheme_do_current_error_port(struct ao_scheme_cons *cons)
-{
- if (!ao_scheme_parse_args(_ao_scheme_atom_current2derror2dport, cons,
- AO_SCHEME_ARG_END))
- return AO_SCHEME_NIL;
- if (!ao_scheme_stderr)
- ao_scheme_stderr = ao_scheme_port_poly(ao_scheme_port_alloc(stderr, true));
- return ao_scheme_stderr;
-}
-
-#endif /* AO_SCHEME_FEATURE_PORT */
projects / fw / altos / blobdiff