forked from MarcoBuster/Magisk
140 lines
2.9 KiB
C++
140 lines
2.9 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://opensource.apple.com/source/cvs/cvs-19/cvs/lib/getline.c
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* License: GPL 2 or later
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* Adjusted to match POSIX */
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#define MIN_CHUNK 64
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ssize_t __getdelim(char **lineptr, size_t *n, int delim, FILE *stream) {
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size_t nchars_avail;
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char *read_pos;
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if (!lineptr || !n || !stream) {
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errno = EINVAL;
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return -1;
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}
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if (!*lineptr) {
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*n = MIN_CHUNK;
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*lineptr = (char *) malloc(*n);
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if (!*lineptr) {
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errno = ENOMEM;
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return -1;
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}
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}
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nchars_avail = *n;
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read_pos = *lineptr;
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for (;;) {
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int save_errno;
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int c = getc(stream);
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save_errno = errno;
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if (nchars_avail < 2) {
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if (*n > MIN_CHUNK)
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*n *= 2;
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else
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*n += MIN_CHUNK;
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nchars_avail = *n + *lineptr - read_pos;
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*lineptr = (char *) realloc(*lineptr, *n);
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if (!*lineptr) {
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errno = ENOMEM;
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return -1;
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}
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read_pos = *n - nchars_avail + *lineptr;
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}
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if (ferror(stream)) {
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errno = save_errno;
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return -1;
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}
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if (c == EOF) {
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if (read_pos == *lineptr)
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return -1;
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else
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break;
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}
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*read_pos++ = c;
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nchars_avail--;
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if (c == delim)
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break;
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}
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*read_pos = '\0';
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return read_pos - *lineptr;
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}
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ssize_t __getline(char **lineptr, size_t *n, FILE *stream) {
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return getdelim(lineptr, n, '\n', stream);
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}
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/* mntent functions are copied from AOSP libc/bionic/mntent.cpp */
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struct 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) != 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 *__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 != 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 *__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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