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
getmntent(FILE * fp)34 mntent* 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
getmntent_r(FILE * fp,struct mntent * e,char * buf,int buf_len)39 mntent* 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) != nullptr) {
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 nullptr;
64 }
65
setmntent(const char * path,const char * mode)66 FILE* setmntent(const char* path, const char* mode) {
67 return fopen(path, mode);
68 }
69
endmntent(FILE * fp)70 int endmntent(FILE* fp) {
71 if (fp != nullptr) {
72 fclose(fp);
73 }
74 return 1;
75 }
76
hasmntopt(const struct mntent * mnt,const char * opt)77 char* 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