diff options
Diffstat (limited to 'src/scheme/ao_scheme_port.c')
| -rw-r--r-- | src/scheme/ao_scheme_port.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/scheme/ao_scheme_port.c b/src/scheme/ao_scheme_port.c new file mode 100644 index 00000000..b5e5d8dc --- /dev/null +++ b/src/scheme/ao_scheme_port.c @@ -0,0 +1,193 @@ +/* + * 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 */ |