3679ade533
bionic has the Linux-specific mntent.h but is missing hasmntopt(). Change-Id: I0ab7b83626c969704add4e64b37a6fc715d4a723 Signed-off-by: Greg Hackmann <ghackmann@google.com>
100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <mntent.h>
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#include <string.h>
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#include "private/ThreadLocalBuffer.h"
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static ThreadLocalBuffer<mntent> g_getmntent_mntent_tls_buffer;
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static ThreadLocalBuffer<char, BUFSIZ> g_getmntent_strings_tls_buffer;
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mntent* getmntent(FILE* fp) {
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return getmntent_r(fp, g_getmntent_mntent_tls_buffer.get(),
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g_getmntent_strings_tls_buffer.get(),
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g_getmntent_strings_tls_buffer.size());
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}
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mntent* getmntent_r(FILE* fp, struct mntent* e, char* buf, int buf_len) {
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memset(e, 0, sizeof(*e));
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while (fgets(buf, buf_len, fp) != NULL) {
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// Entries look like "proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0".
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// That is: mnt_fsname mnt_dir mnt_type mnt_opts 0 0.
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int fsname0, fsname1, dir0, dir1, type0, type1, opts0, opts1;
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if (sscanf(buf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
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&fsname0, &fsname1, &dir0, &dir1, &type0, &type1, &opts0, &opts1,
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&e->mnt_freq, &e->mnt_passno) == 2) {
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e->mnt_fsname = &buf[fsname0];
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buf[fsname1] = '\0';
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e->mnt_dir = &buf[dir0];
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buf[dir1] = '\0';
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e->mnt_type = &buf[type0];
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buf[type1] = '\0';
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e->mnt_opts = &buf[opts0];
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buf[opts1] = '\0';
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return e;
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}
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}
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return NULL;
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}
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FILE* setmntent(const char* path, const char* mode) {
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return fopen(path, mode);
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}
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int endmntent(FILE* fp) {
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if (fp != NULL) {
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fclose(fp);
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}
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return 1;
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}
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char* hasmntopt(const struct mntent* mnt, const char* opt) {
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char* token = mnt->mnt_opts;
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char* const end = mnt->mnt_opts + strlen(mnt->mnt_opts);
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const size_t optLen = strlen(opt);
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while (token) {
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char* const tokenEnd = token + optLen;
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if (tokenEnd > end) break;
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if (memcmp(token, opt, optLen) == 0 &&
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(*tokenEnd == '\0' || *tokenEnd == ',' || *tokenEnd == '=')) {
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return token;
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}
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token = strchr(token, ',');
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if (token) token++;
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}
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return nullptr;
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}
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