1 /* 2 * A context resource offering support for opening files. 3 * 4 * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #include "opener_context_resource.h" 23 #include "opener_context_object_server.h" 24 #include "opener_resource.h" 25 26 #include <string.h> 27 28 29 30 /* Support for providing access to files. */ 31 32 OpenerContextResource::OpenerContextResource(OpenerResource *opener, Memory *memory) 33 : SimplePager(memory), _opener(opener) 34 { 35 } 36 37 int OpenerContextResource::expected_items() 38 { 39 return OpenerContextObject_expected_items; 40 } 41 42 ipc_server_handler_type OpenerContextResource::handler() 43 { 44 return (ipc_server_handler_type) handle_OpenerContextObject; 45 } 46 47 48 49 /* Data access methods. */ 50 51 char *OpenerContextResource::get_path() 52 { 53 char *buffer = _region->read(); 54 offset_t size = _region->size(); 55 56 /* Confine the path to the limit of the buffer. */ 57 58 if ((buffer != NULL) && (strnlen(buffer, size) < size)) 59 return buffer; 60 else 61 return NULL; 62 } 63 64 65 66 /* Opener context interface methods. */ 67 68 long OpenerContextResource::open(flags_t flags, offset_t *size, l4_cap_idx_t *file) 69 { 70 char *path = get_path(); 71 72 if (path == NULL) 73 return -L4_EINVAL; 74 75 return _opener->open(path, flags, size, file); 76 } 77 78 // vim: tabstop=4 expandtab shiftwidth=4