--- /dev/null
+/*
+ * 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