[thirdparty/e2fsprogs.git] / lib / e2p / feature.c

/*
 * 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 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_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_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_BTREE_DIR,
			"btree_dir" },
	{	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" },
	{	0, 0, 0 },
};

const char *e2p_feature2string(int compat, unsigned int mask)
{
	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)
{
	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 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 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 = malloc(strlen(str)+1);
	if (!buf)
		return 1;
	strcpy(buf, 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;
}
Commit	Line	Data
d7b701de TT	1	/*
	2	* feature.c --- convert between features and strings
	3	*
	4	* Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu>
	5	*
	6	* This file can be redistributed under the terms of the GNU Library General
	7	* Public License
	8	*
	9	*/
	10
	11	#include <stdio.h>
	12	#include <stdlib.h>
	13	#include <string.h>
36caf25f	14	#include <ctype.h>
d7b701de TT	15	#include <errno.h>
	16
	17	#include "e2p.h"
	18
d7b701de TT	19	struct feature {
	20	int compat;
	21	unsigned int mask;
36caf25f	22	const char *string;
d7b701de TT	23	};
d7b701de TT	24
e2207ce5	25	static struct feature feature_list[] = {
d7b701de TT	26	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,
	27	"dir_prealloc" },
	28	{ E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
	29	"has_journal" },
	30	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
	31	"imagic_inodes" },
49d5ddcc TT	32	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,
	33	"dir_index" },
	34	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
	35	"resize_inode" },
d7b701de TT	36	{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
	37	"sparse_super" },
	38	{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
	39	"large_file" },
	40	{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_BTREE_DIR,
	41	"btree_dir" },
	42	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
	43	"compression" },
	44	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
	45	"filetype" },
	46	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
	47	"needs_recovery" },
c2204b32 TT	48	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
c2204b32 TT	49	"journal_dev" },
d7b701de TT	50	{ 0, 0, 0 },
	51	};
	52
36caf25f	53	const char *e2p_feature2string(int compat, unsigned int mask)
d7b701de TT	54	{
	55	struct feature *f;
	56	static char buf[20];
	57	char fchar;
	58	int fnum;
	59
	60	for (f = feature_list; f->string; f++) {
	61	if ((compat == f->compat) &&
	62	(mask == f->mask))
	63	return f->string;
	64	}
	65	switch (compat) {
	66	case E2P_FEATURE_COMPAT:
	67	fchar = 'C';
	68	break;
	69	case E2P_FEATURE_INCOMPAT:
	70	fchar = 'I';
	71	break;
	72	case E2P_FEATURE_RO_INCOMPAT:
	73	fchar = 'R';
	74	break;
	75	default:
	76	fchar = '?';
	77	break;
	78	}
	79	for (fnum = 0; mask >>= 1; fnum++);
	80	sprintf(buf, "FEATURE_%c%d", fchar, fnum);
	81	return buf;
	82	}
	83
36caf25f	84	int e2p_string2feature(char string, int compat_type, unsigned int *mask)
d7b701de TT	85	{
	86	struct feature *f;
	87	char *eptr;
	88	int num;
	89
	90	for (f = feature_list; f->string; f++) {
	91	if (!strcasecmp(string, f->string)) {
36caf25f	92	*compat_type = f->compat;
d7b701de TT	93	*mask = f->mask;
	94	return 0;
	95	}
	96	}
	97	if (strncasecmp(string, "FEATURE_", 8))
	98	return 1;
	99
	100	switch (string[8]) {
	101	case 'c':
	102	case 'C':
36caf25f	103	*compat_type = E2P_FEATURE_COMPAT;
d7b701de TT	104	break;
	105	case 'i':
	106	case 'I':
36caf25f	107	*compat_type = E2P_FEATURE_INCOMPAT;
d7b701de TT	108	break;
	109	case 'r':
	110	case 'R':
36caf25f	111	*compat_type = E2P_FEATURE_RO_INCOMPAT;
d7b701de TT	112	break;
	113	default:
	114	return 1;
	115	}
	116	if (string[9] == 0)
	117	return 1;
	118	num = strtol(string+9, &eptr, 10);
	119	if (num > 32 \|\| num < 0)
	120	return 1;
	121	if (*eptr)
	122	return 1;
	123	*mask = 1 << num;
	124	return 0;
	125	}
	126
	127	static char skip_over_blanks(char cp)
	128	{
	129	while (cp && isspace(cp))
	130	cp++;
	131	return cp;
	132	}
	133
36caf25f	134	static char skip_over_word(char cp)
d7b701de	135	{
944ab713	136	while (cp && !isspace(cp) && *cp != ',')
d7b701de TT	137	cp++;
	138	return cp;
	139	}
	140
944ab713 TT	141	/*
	142	* Edit a feature set array as requested by the user. The ok_array,
	143	* if set, allows the application to limit what features the user is
	144	* allowed to set or clear using this function.
	145	*/
36caf25f	146	int e2p_edit_feature(const char str, __u32 compat_array, __u32 *ok_array)
d7b701de TT	147	{
	148	char cp, buf, *next;
	149	int neg;
36caf25f TT	150	unsigned int mask;
36caf25f TT	151	int compat_type;
d7b701de TT	152
d7b701de TT	153	buf = malloc(strlen(str)+1);
944ab713	154	if (!buf)
d7b701de	155	return 1;
d7b701de TT	156	strcpy(buf, str);
	157	cp = buf;
	158	while (cp && *cp) {
	159	neg = 0;
	160	cp = skip_over_blanks(cp);
	161	next = skip_over_word(cp);
	162	if (*next == 0)
	163	next = 0;
	164	else
	165	*next = 0;
	166	switch (*cp) {
	167	case '-':
	168	case '^':
	169	neg++;
	170	case '+':
	171	cp++;
	172	break;
	173	}
36caf25f	174	if (e2p_string2feature(cp, &compat_type, &mask))
d7b701de	175	return 1;
36caf25f	176	if (ok_array && !(ok_array[compat_type] & mask))
944ab713	177	return 1;
d7b701de	178	if (neg)
36caf25f	179	compat_array[compat_type] &= ~mask;
d7b701de	180	else
36caf25f	181	compat_array[compat_type] \|= mask;
d7b701de TT	182	cp = next ? next+1 : 0;
	183	}
	184	return 0;
	185	}
	186