1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <mntent.h> 30#include <string.h> 31 32#include "bionic/pthread_internal.h" 33 34mntent* getmntent(FILE* fp) { 35 auto& tls = __get_bionic_tls(); 36 return getmntent_r(fp, &tls.mntent_buf, tls.mntent_strings, sizeof(tls.mntent_strings)); 37} 38 39mntent* getmntent_r(FILE* fp, struct mntent* e, char* buf, int buf_len) { 40 memset(e, 0, sizeof(*e)); 41 while (fgets(buf, buf_len, fp) != NULL) { 42 // Entries look like "proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0". 43 // That is: mnt_fsname mnt_dir mnt_type mnt_opts 0 0. 44 int fsname0, fsname1, dir0, dir1, type0, type1, opts0, opts1; 45 if (sscanf(buf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d", 46 &fsname0, &fsname1, &dir0, &dir1, &type0, &type1, &opts0, &opts1, 47 &e->mnt_freq, &e->mnt_passno) == 2) { 48 e->mnt_fsname = &buf[fsname0]; 49 buf[fsname1] = '\0'; 50 51 e->mnt_dir = &buf[dir0]; 52 buf[dir1] = '\0'; 53 54 e->mnt_type = &buf[type0]; 55 buf[type1] = '\0'; 56 57 e->mnt_opts = &buf[opts0]; 58 buf[opts1] = '\0'; 59 60 return e; 61 } 62 } 63 return NULL; 64} 65 66FILE* setmntent(const char* path, const char* mode) { 67 return fopen(path, mode); 68} 69 70int endmntent(FILE* fp) { 71 if (fp != NULL) { 72 fclose(fp); 73 } 74 return 1; 75} 76 77char* hasmntopt(const struct mntent* mnt, const char* opt) { 78 char* token = mnt->mnt_opts; 79 char* const end = mnt->mnt_opts + strlen(mnt->mnt_opts); 80 const size_t optLen = strlen(opt); 81 82 while (token) { 83 char* const tokenEnd = token + optLen; 84 if (tokenEnd > end) break; 85 86 if (memcmp(token, opt, optLen) == 0 && 87 (*tokenEnd == '\0' || *tokenEnd == ',' || *tokenEnd == '=')) { 88 return token; 89 } 90 91 token = strchr(token, ','); 92 if (token) token++; 93 } 94 95 return nullptr; 96} 97