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| | #include <stdio.h>
#include <string.h>
#include <mntent.h>
#include <errno.h>
#include <limits.h>
static char *internal_buf;
static size_t internal_bufsize;
#define SENTINEL (char *)&internal_buf
FILE *setmntent(const char *name, const char *mode)
{
return fopen(name, mode);
}
int endmntent(FILE *f)
{
if (f) fclose(f);
return 1;
}
static char *unescape_ent(char *beg)
{
char *dest = beg;
const char *src = beg;
while (*src) {
const char *val;
unsigned char cval = 0;
if (*src != '\\') {
*dest++ = *src++;
continue;
}
if (src[1] == '\\') {
++src;
*dest++ = *src++;
continue;
}
val = src + 1;
for (int i = 0; i < 3; ++i) {
if (*val >= '0' && *val <= '7') {
cval <<= 3;
cval += *val++ - '0';
} else {
break;
}
}
if (cval) {
*dest++ = cval;
src = val;
} else {
*dest++ = *src++;
}
}
*dest = 0;
return beg;
}
struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
{
int n[8], use_internal = (linebuf == SENTINEL);
size_t len, 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%*[^ \t]%n %n%*[^ \t]%n %n%*[^ \t]%n %n%*[^ \t]%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 = unescape_ent(linebuf+n[0]);
mnt->mnt_dir = unescape_ent(linebuf+n[2]);
mnt->mnt_type = unescape_ent(linebuf+n[4]);
mnt->mnt_opts = unescape_ent(linebuf+n[6]);
return mnt;
}
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;
}
char *hasmntopt(const struct mntent *mnt, const char *opt)
{
return strstr(mnt->mnt_opts, opt);
}
|