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      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 "private/ThreadLocalBuffer.h"
     33 
     34 static ThreadLocalBuffer<mntent> g_getmntent_mntent_tls_buffer;
     35 static ThreadLocalBuffer<char, BUFSIZ> g_getmntent_strings_tls_buffer;
     36 
     37 mntent* getmntent(FILE* fp) {
     38   return getmntent_r(fp, g_getmntent_mntent_tls_buffer.get(),
     39                      g_getmntent_strings_tls_buffer.get(),
     40                      g_getmntent_strings_tls_buffer.size());
     41 }
     42 
     43 mntent* getmntent_r(FILE* fp, struct mntent* e, char* buf, int buf_len) {
     44   memset(e, 0, sizeof(*e));
     45   while (fgets(buf, buf_len, fp) != NULL) {
     46     // Entries look like "proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0".
     47     // That is: mnt_fsname mnt_dir mnt_type mnt_opts 0 0.
     48     int fsname0, fsname1, dir0, dir1, type0, type1, opts0, opts1;
     49     if (sscanf(buf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
     50                &fsname0, &fsname1, &dir0, &dir1, &type0, &type1, &opts0, &opts1,
     51                &e->mnt_freq, &e->mnt_passno) == 2) {
     52       e->mnt_fsname = &buf[fsname0];
     53       buf[fsname1] = '\0';
     54 
     55       e->mnt_dir = &buf[dir0];
     56       buf[dir1] = '\0';
     57 
     58       e->mnt_type = &buf[type0];
     59       buf[type1] = '\0';
     60 
     61       e->mnt_opts = &buf[opts0];
     62       buf[opts1] = '\0';
     63 
     64       return e;
     65     }
     66   }
     67   return NULL;
     68 }
     69 
     70 FILE* setmntent(const char* path, const char* mode) {
     71   return fopen(path, mode);
     72 }
     73 
     74 int endmntent(FILE* fp) {
     75   if (fp != NULL) {
     76     fclose(fp);
     77   }
     78   return 1;
     79 }
     80