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#include <errno.h>
#include <mntent.h>
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <bits/ensure.h>
namespace {
char *internal_buf;
size_t internal_bufsize;
}
#define SENTINEL (char *)&internal_buf
FILE *setmntent(const char *name, const char *mode) {
return fopen(name, mode);
}
struct mntent *getmntent(FILE *f) {
static struct mntent mnt;
return getmntent_r(f, &mnt, SENTINEL, 0);
}
int addmntent(FILE *f, const struct mntent *mnt) {
if(fseek(f, 0, SEEK_END)) {
return 1;
}
return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
mnt->mnt_freq, mnt->mnt_passno) < 0;
}
int endmntent(FILE *f) {
if(f) {
fclose(f);
}
return 1;
}
char *hasmntopt(const struct mntent *mnt, const char *opt) {
return strstr(mnt->mnt_opts, opt);
}
/* Adapted from musl */
struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen) {
int n[8];
bool use_internal = (linebuf == SENTINEL);
int len;
size_t i;
mnt->mnt_freq = 0;
mnt->mnt_passno = 0;
do {
if(use_internal) {
getline(&internal_buf, &internal_bufsize, f);
linebuf = internal_buf;
} else {
fgets(linebuf, buflen, f);
}
if(feof(f) || ferror(f)) {
return 0;
}
if(!strchr(linebuf, '\n')) {
fscanf(f, "%*[^\n]%*[\n]");
errno = ERANGE;
return 0;
}
len = strlen(linebuf);
if(len > INT_MAX) {
continue;
}
for(i = 0; i < sizeof n / sizeof *n; i++) {
n[i] = len;
}
sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
n, n + 1, n + 2, n + 3, n + 4, n + 5, n + 6, n + 7,
&mnt->mnt_freq, &mnt->mnt_passno);
} while(linebuf[n[0]] == '#' || n[1] == len);
linebuf[n[1]] = 0;
linebuf[n[3]] = 0;
linebuf[n[5]] = 0;
linebuf[n[7]] = 0;
mnt->mnt_fsname = linebuf + n[0];
mnt->mnt_dir = linebuf + n[2];
mnt->mnt_type = linebuf + n[4];
mnt->mnt_opts = linebuf + n[6];
return mnt;
}
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