mirror of
https://github.com/sheumann/hush.git
synced 2024-11-05 06:07:00 +00:00
134 lines
2.5 KiB
C
134 lines
2.5 KiB
C
/*
|
|
* mountopts.c --- convert between default mount options and strings
|
|
*
|
|
* Copyright (C) 2002 Theodore Ts'o <tytso@mit.edu>
|
|
*
|
|
* This file can be redistributed under the terms of the GNU Library General
|
|
* Public License
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
|
|
#include "e2p.h"
|
|
|
|
struct mntopt {
|
|
unsigned int mask;
|
|
const char *string;
|
|
};
|
|
|
|
static const struct mntopt mntopt_list[] = {
|
|
{ EXT2_DEFM_DEBUG, "debug" },
|
|
{ EXT2_DEFM_BSDGROUPS, "bsdgroups" },
|
|
{ EXT2_DEFM_XATTR_USER, "user_xattr" },
|
|
{ EXT2_DEFM_ACL, "acl" },
|
|
{ EXT2_DEFM_UID16, "uid16" },
|
|
{ EXT3_DEFM_JMODE_DATA, "journal_data" },
|
|
{ EXT3_DEFM_JMODE_ORDERED, "journal_data_ordered" },
|
|
{ EXT3_DEFM_JMODE_WBACK, "journal_data_writeback" },
|
|
{ 0, 0 },
|
|
};
|
|
|
|
const char *e2p_mntopt2string(unsigned int mask)
|
|
{
|
|
const struct mntopt *f;
|
|
static char buf[20];
|
|
int fnum;
|
|
|
|
for (f = mntopt_list; f->string; f++) {
|
|
if (mask == f->mask)
|
|
return f->string;
|
|
}
|
|
for (fnum = 0; mask >>= 1; fnum++);
|
|
sprintf(buf, "MNTOPT_%d", fnum);
|
|
return buf;
|
|
}
|
|
|
|
int e2p_string2mntopt(char *string, unsigned int *mask)
|
|
{
|
|
const struct mntopt *f;
|
|
char *eptr;
|
|
int num;
|
|
|
|
for (f = mntopt_list; f->string; f++) {
|
|
if (!strcasecmp(string, f->string)) {
|
|
*mask = f->mask;
|
|
return 0;
|
|
}
|
|
}
|
|
if (strncasecmp(string, "MNTOPT_", 8))
|
|
return 1;
|
|
|
|
if (string[8] == 0)
|
|
return 1;
|
|
num = strtol(string+8, &eptr, 10);
|
|
if (num > 32 || num < 0)
|
|
return 1;
|
|
if (*eptr)
|
|
return 1;
|
|
*mask = 1 << num;
|
|
return 0;
|
|
}
|
|
|
|
static char *skip_over_blanks(char *cp)
|
|
{
|
|
while (*cp && isspace(*cp))
|
|
cp++;
|
|
return cp;
|
|
}
|
|
|
|
static char *skip_over_word(char *cp)
|
|
{
|
|
while (*cp && !isspace(*cp) && *cp != ',')
|
|
cp++;
|
|
return cp;
|
|
}
|
|
|
|
/*
|
|
* Edit a mntopt set array as requested by the user. The ok
|
|
* parameter, if non-zero, allows the application to limit what
|
|
* mntopts the user is allowed to set or clear using this function.
|
|
*/
|
|
int e2p_edit_mntopts(const char *str, __u32 *mntopts, __u32 ok)
|
|
{
|
|
char *cp, *buf, *next;
|
|
int neg;
|
|
unsigned int mask;
|
|
|
|
buf = bb_xstrdup(str);
|
|
cp = buf;
|
|
while (cp && *cp) {
|
|
neg = 0;
|
|
cp = skip_over_blanks(cp);
|
|
next = skip_over_word(cp);
|
|
if (*next == 0)
|
|
next = 0;
|
|
else
|
|
*next = 0;
|
|
switch (*cp) {
|
|
case '-':
|
|
case '^':
|
|
neg++;
|
|
case '+':
|
|
cp++;
|
|
break;
|
|
}
|
|
if (e2p_string2mntopt(cp, &mask))
|
|
return 1;
|
|
if (ok && !(ok & mask))
|
|
return 1;
|
|
if (mask & EXT3_DEFM_JMODE)
|
|
*mntopts &= ~EXT3_DEFM_JMODE;
|
|
if (neg)
|
|
*mntopts &= ~mask;
|
|
else
|
|
*mntopts |= mask;
|
|
cp = next ? next+1 : 0;
|
|
}
|
|
return 0;
|
|
}
|