forked from MarcoBuster/Magisk
110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
/*
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* Host all missing/incomplete implementation in bionic
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* Copied from various sources
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* */
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <mntent.h>
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#include "missing.hpp"
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/* Original source: https://github.com/freebsd/freebsd/blob/master/contrib/file/src/getline.c
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* License: BSD, full copyright notice please check original source */
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ssize_t compat_getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp) {
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char *ptr, *eptr;
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if (*buf == nullptr || *bufsiz == 0) {
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*bufsiz = BUFSIZ;
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if ((*buf = (char *) malloc(*bufsiz)) == nullptr)
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return -1;
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}
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for (ptr = *buf, eptr = *buf + *bufsiz;;) {
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int c = fgetc(fp);
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if (c == -1) {
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if (feof(fp))
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return ptr == *buf ? -1 : ptr - *buf;
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else
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return -1;
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}
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*ptr++ = c;
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if (c == delimiter) {
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*ptr = '\0';
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return ptr - *buf;
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}
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if (ptr + 2 >= eptr) {
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char *nbuf;
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size_t nbufsiz = *bufsiz * 2;
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ssize_t d = ptr - *buf;
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if ((nbuf = (char *) realloc(*buf, nbufsiz)) == nullptr)
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return -1;
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*buf = nbuf;
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*bufsiz = nbufsiz;
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eptr = nbuf + nbufsiz;
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ptr = nbuf + d;
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}
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}
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}
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ssize_t compat_getline(char **buf, size_t *bufsiz, FILE *fp) {
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return getdelim(buf, bufsiz, '\n', fp);
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}
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/* Original source: https://android.googlesource.com/platform/bionic/+/master/libc/bionic/mntent.cpp
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* License: AOSP, full copyright notice please check original source */
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struct mntent *compat_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) != nullptr) {
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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 nullptr;
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}
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FILE *compat_setmntent(const char* path, const char* mode) {
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return fopen(path, mode);
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}
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int compat_endmntent(FILE* fp) {
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if (fp != nullptr) {
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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 *compat_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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