/* vi: set sw=4 ts=4: *//* * feature.c --- convert between features and strings * * Copyright (C) 1999  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 feature {	int		compat;	unsigned int	mask;	const char	*string;};static const struct feature feature_list[] = {	{	E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,			"dir_prealloc" },	{	E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,			"has_journal" },	{	E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,			"imagic_inodes" },	{	E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,			"ext_attr" },	{	E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,			"dir_index" },	{	E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,			"resize_inode" },	{	E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,			"sparse_super" },	{	E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,			"large_file" },	{	E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,			"compression" },	{	E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,			"filetype" },	{	E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,			"needs_recovery" },	{	E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,			"journal_dev" },	{	E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,			"extents" },	{	E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,			"meta_bg" },	{	0, 0, 0 },};const char *e2p_feature2string(int compat, unsigned int mask){	const struct feature *f;	static char buf[20];	char fchar;	int fnum;	for (f = feature_list; f->string; f++) {		if ((compat == f->compat) &&		    (mask == f->mask))			return f->string;	}	switch (compat) {	case E2P_FEATURE_COMPAT:		fchar = 'C';		break;	case E2P_FEATURE_INCOMPAT:		fchar = 'I';		break;	case E2P_FEATURE_RO_INCOMPAT:		fchar = 'R';		break;	default:		fchar = '?';		break;	}	for (fnum = 0; mask >>= 1; fnum++);		sprintf(buf, "FEATURE_%c%d", fchar, fnum);	return buf;}int e2p_string2feature(char *string, int *compat_type, unsigned int *mask){	const struct feature *f;	char *eptr;	int num;	for (f = feature_list; f->string; f++) {		if (!strcasecmp(string, f->string)) {			*compat_type = f->compat;			*mask = f->mask;			return 0;		}	}	if (strncasecmp(string, "FEATURE_", 8))		return 1;	switch (string[8]) {	case 'c':	case 'C':		*compat_type = E2P_FEATURE_COMPAT;		break;	case 'i':	case 'I':		*compat_type = E2P_FEATURE_INCOMPAT;		break;	case 'r':	case 'R':		*compat_type = E2P_FEATURE_RO_INCOMPAT;		break;	default:		return 1;	}	if (string[9] == 0)		return 1;	num = strtol(string+9, &eptr, 10);	if (num > 32 || num < 0)		return 1;	if (*eptr)		return 1;	*mask = 1 << num;	return 0;}static inline char *skip_over_blanks(char *cp){	while (*cp && isspace(*cp))		cp++;	return cp;}static inline char *skip_over_word(char *cp){	while (*cp && !isspace(*cp) && *cp != ',')		cp++;	return cp;}/* * Edit a feature set array as requested by the user.  The ok_array, * if set, allows the application to limit what features the user is * allowed to set or clear using this function. */int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array){	char	*cp, *buf, *next;	int	neg;	unsigned int	mask;	int		compat_type;	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_string2feature(cp, &compat_type, &mask))			return 1;		if (ok_array && !(ok_array[compat_type] & mask))			return 1;		if (neg)			compat_array[compat_type] &= ~mask;		else			compat_array[compat_type] |= mask;		cp = next ? next+1 : 0;	}	return 0;}