1/*** 2 This file is part of eudev, forked from systemd. 3 4 Copyright 2008-2011 Kay Sievers 5 6 systemd is free software; you can redistribute it and/or modify it 7 under the terms of the GNU Lesser General Public License as published by 8 the Free Software Foundation; either version 2.1 of the License, or 9 (at your option) any later version. 10 11 systemd is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with systemd; If not, see <http://www.gnu.org/licenses/>. 18***/ 19 20#include <stdlib.h> 21#include <stdio.h> 22#include <stdint.h> 23#include <string.h> 24#include <sys/types.h> 25 26#include "device-nodes.h" 27#include "utf8.h" 28 29int whitelisted_char_for_devnode(char c, const char *white) { 30 31 if ((c >= '0' && c <= '9') || 32 (c >= 'A' && c <= 'Z') || 33 (c >= 'a' && c <= 'z') || 34 strchr("#+-.:=@_", c) != NULL || 35 (white != NULL && strchr(white, c) != NULL)) 36 return 1; 37 38 return 0; 39} 40 41int encode_devnode_name(const char *str, char *str_enc, size_t len) { 42 size_t i, j; 43 44 if (str == NULL || str_enc == NULL) 45 return -EINVAL; 46 47 for (i = 0, j = 0; str[i] != '\0'; i++) { 48 int seqlen; 49 50 seqlen = utf8_encoded_valid_unichar(&str[i]); 51 if (seqlen > 1) { 52 53 if (len-j < (size_t)seqlen) 54 return -EINVAL; 55 56 memcpy(&str_enc[j], &str[i], seqlen); 57 j += seqlen; 58 i += (seqlen-1); 59 60 } else if (str[i] == '\\' || !whitelisted_char_for_devnode(str[i], NULL)) { 61 62 if (len-j < 4) 63 return -EINVAL; 64 65 sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]); 66 j += 4; 67 68 } else { 69 if (len-j < 1) 70 return -EINVAL; 71 72 str_enc[j] = str[i]; 73 j++; 74 } 75 } 76 77 if (len-j < 1) 78 return -EINVAL; 79 80 str_enc[j] = '\0'; 81 return 0; 82} 83