/* vi: set sw=4 ts=4: *//* * 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 = 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;}