mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-28 20:45:24 +00:00
140 lines
2.9 KiB
C++
140 lines
2.9 KiB
C++
/*
|
|
* Host all missing/incomplete implementation in bionic
|
|
* Copied from various sources
|
|
* */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <mntent.h>
|
|
|
|
#include "missing.h"
|
|
|
|
/* Original source: https://opensource.apple.com/source/cvs/cvs-19/cvs/lib/getline.c
|
|
* License: GPL 2 or later
|
|
* Adjusted to match POSIX */
|
|
#define MIN_CHUNK 64
|
|
ssize_t __getdelim(char **lineptr, size_t *n, int delim, FILE *stream) {
|
|
size_t nchars_avail;
|
|
char *read_pos;
|
|
|
|
if (!lineptr || !n || !stream) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (!*lineptr) {
|
|
*n = MIN_CHUNK;
|
|
*lineptr = (char *) malloc(*n);
|
|
if (!*lineptr) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
nchars_avail = *n;
|
|
read_pos = *lineptr;
|
|
|
|
for (;;) {
|
|
int save_errno;
|
|
int c = getc(stream);
|
|
|
|
save_errno = errno;
|
|
|
|
if (nchars_avail < 2) {
|
|
if (*n > MIN_CHUNK)
|
|
*n *= 2;
|
|
else
|
|
*n += MIN_CHUNK;
|
|
|
|
nchars_avail = *n + *lineptr - read_pos;
|
|
*lineptr = (char *) realloc(*lineptr, *n);
|
|
if (!*lineptr) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
read_pos = *n - nchars_avail + *lineptr;
|
|
}
|
|
|
|
if (ferror(stream)) {
|
|
errno = save_errno;
|
|
return -1;
|
|
}
|
|
|
|
if (c == EOF) {
|
|
if (read_pos == *lineptr)
|
|
return -1;
|
|
else
|
|
break;
|
|
}
|
|
|
|
*read_pos++ = c;
|
|
nchars_avail--;
|
|
|
|
if (c == delim)
|
|
break;
|
|
}
|
|
|
|
*read_pos = '\0';
|
|
|
|
return read_pos - *lineptr;
|
|
}
|
|
|
|
ssize_t __getline(char **lineptr, size_t *n, FILE *stream) {
|
|
return getdelim(lineptr, n, '\n', stream);
|
|
}
|
|
|
|
/* mntent functions are copied from AOSP libc/bionic/mntent.cpp */
|
|
|
|
struct mntent *__getmntent_r(FILE* fp, struct mntent* e, char* buf, int buf_len) {
|
|
memset(e, 0, sizeof(*e));
|
|
while (fgets(buf, buf_len, fp) != nullptr) {
|
|
// Entries look like "proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0".
|
|
// That is: mnt_fsname mnt_dir mnt_type mnt_opts 0 0.
|
|
int fsname0, fsname1, dir0, dir1, type0, type1, opts0, opts1;
|
|
if (sscanf(buf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
|
|
&fsname0, &fsname1, &dir0, &dir1, &type0, &type1, &opts0, &opts1,
|
|
&e->mnt_freq, &e->mnt_passno) == 2) {
|
|
e->mnt_fsname = &buf[fsname0];
|
|
buf[fsname1] = '\0';
|
|
e->mnt_dir = &buf[dir0];
|
|
buf[dir1] = '\0';
|
|
e->mnt_type = &buf[type0];
|
|
buf[type1] = '\0';
|
|
e->mnt_opts = &buf[opts0];
|
|
buf[opts1] = '\0';
|
|
return e;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
FILE *__setmntent(const char* path, const char* mode) {
|
|
return fopen(path, mode);
|
|
}
|
|
|
|
int __endmntent(FILE* fp) {
|
|
if (fp != nullptr) {
|
|
fclose(fp);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
char *__hasmntopt(const struct mntent* mnt, const char* opt) {
|
|
char* token = mnt->mnt_opts;
|
|
char* const end = mnt->mnt_opts + strlen(mnt->mnt_opts);
|
|
const size_t optLen = strlen(opt);
|
|
while (token) {
|
|
char* const tokenEnd = token + optLen;
|
|
if (tokenEnd > end) break;
|
|
if (memcmp(token, opt, optLen) == 0 &&
|
|
(*tokenEnd == '\0' || *tokenEnd == ',' || *tokenEnd == '=')) {
|
|
return token;
|
|
}
|
|
token = strchr(token, ',');
|
|
if (token) token++;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|