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

/*
 * feature.c --- convert between features and strings
 *
 * Copyright (C) 1999  Theodore Ts'o <tytso@mit.edu>
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Library
 * General Public License, version 2.
 * %End-Header%
 */

#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "e2p.h"
#include <ext2fs/ext2fs.h>
#include <ext2fs/jfs_user.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_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_COMPAT, EXT2_FEATURE_COMPAT_LAZY_BG,
			"lazy_bg" },
	{	E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
			"snapshot_bitmap" },
	{	E2P_FEATURE_COMPAT, EXT4_FEATURE_COMPAT_SPARSE_SUPER2,
			"sparse_super2" },

	{	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, EXT4_FEATURE_RO_COMPAT_HUGE_FILE,
			"huge_file" },
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
			"uninit_bg" },
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
			"uninit_groups" },
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_DIR_NLINK,
			"dir_nlink" },
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE,
			"extra_isize" },
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_QUOTA,
			"quota" },
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_BIGALLOC,
			"bigalloc"},
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM,
			"metadata_csum"},
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_REPLICA,
			"replica" },
	{	E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_READONLY,
			"read-only" },

	{	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,
			"extent" },
	{	E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
			"extents" },
	{	E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
			"meta_bg" },
	{	E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_64BIT,
			"64bit" },
	{       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_MMP,
			"mmp" },
	{       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_FLEX_BG,
			"flex_bg"},
	{       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_EA_INODE,
			"ea_inode"},
	{       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_DIRDATA,
			"dirdata"},
	{       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_LARGEDIR,
			"large_dir"},
	{       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_INLINE_DATA,
			"inline_data"},
	{       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_ENCRYPT,
			"encrypt"},
	{	0, 0, 0 },
};

static struct feature jrnl_feature_list[] = {
       {       E2P_FEATURE_COMPAT, JFS_FEATURE_COMPAT_CHECKSUM,
                       "journal_checksum" },

       {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_REVOKE,
                       "journal_incompat_revoke" },
       {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_64BIT,
                       "journal_64bit" },
       {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_ASYNC_COMMIT,
                       "journal_async_commit" },
       {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V2,
                       "journal_checksum_v2" },
       {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V3,
                       "journal_checksum_v3" },
       {       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 > 31 || num < 0)
		return 1;
	if (*eptr)
		return 1;
	*mask = 1 << num;
	return 0;
}

const char *e2p_jrnl_feature2string(int compat, unsigned int mask)
{
	struct feature  *f;
	static char buf[20];
	char	fchar;
	int	fnum;

	for (f = jrnl_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_jrnl_string2feature(char *string, int *compat_type, unsigned int *mask)
{
	struct feature  *f;
	char		*eptr;
	int		num;

	for (f = jrnl_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 > 31 || 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.  If clear_ok_array is set,
 * then use it tell whether or not it is OK to clear a filesystem feature.
 */
int e2p_edit_feature2(const char *str, __u32 *compat_array, __u32 *ok_array,
		      __u32 *clear_ok_array, int *type_err,
		      unsigned int *mask_err)
{
	char		*cp, *buf, *next;
	int		neg;
	unsigned int	mask;
	int		compat_type;
	int		rc = 0;

	if (!clear_ok_array)
		clear_ok_array = ok_array;

	if (type_err)
		*type_err = 0;
	if (mask_err)
		*mask_err = 0;

	buf = malloc(strlen(str)+1);
	if (!buf)
		return 1;
	strcpy(buf, str);
	for (cp = buf; cp && *cp; cp = next ? next+1 : 0) {
		neg = 0;
		cp = skip_over_blanks(cp);
		next = skip_over_word(cp);

		if (*next == 0)
			next = 0;
		else
			*next = 0;

		if ((strcasecmp(cp, "none") == 0) ||
		    (strcasecmp(cp, "clear") == 0)) {
			compat_array[0] = 0;
			compat_array[1] = 0;
			compat_array[2] = 0;
			continue;
		}

		switch (*cp) {
		case '-':
		case '^':
			neg++;
			/* fallthrough */
		case '+':
			cp++;
			break;
		}
		if (e2p_string2feature(cp, &compat_type, &mask)) {
			rc = 1;
			break;
		}
		if (neg) {
			if (clear_ok_array &&
			    !(clear_ok_array[compat_type] & mask)) {
				rc = 1;
				if (type_err)
					*type_err = (compat_type |
						     E2P_FEATURE_NEGATE_FLAG);
				if (mask_err)
					*mask_err = mask;
				break;
			}
			compat_array[compat_type] &= ~mask;
		} else {
			if (ok_array && !(ok_array[compat_type] & mask)) {
				rc = 1;
				if (type_err)
					*type_err = compat_type;
				if (mask_err)
					*mask_err = mask;
				break;
			}
			compat_array[compat_type] |= mask;
		}
	}
	free(buf);
	return rc;
}

int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
{
	return e2p_edit_feature2(str, compat_array, ok_array, 0, 0, 0);
}

#ifdef TEST_PROGRAM
int main(int argc, char **argv)
{
	int compat, compat2, i;
	unsigned int mask, mask2;
	const char *str;
	struct feature *f;

	for (i = 0; i < 2; i++) {
		if (i == 0) {
			f = feature_list;
			printf("Feature list:\n");
		} else {
			printf("\nJournal feature list:\n");
			f = jrnl_feature_list;
		}
		for (; f->string; f++) {
			if (i == 0) {
				e2p_string2feature((char *)f->string, &compat,
						   &mask);
				str = e2p_feature2string(compat, mask);
			} else {
				e2p_jrnl_string2feature((char *)f->string,
							&compat, &mask);
				str = e2p_jrnl_feature2string(compat, mask);
			}

			printf("\tCompat = %d, Mask = %u, %s\n",
			       compat, mask, f->string);
			if (strcmp(f->string, str)) {
				if (e2p_string2feature((char *) str, &compat2,
						       &mask2) ||
				    (compat2 != compat) ||
				    (mask2 != mask)) {
					fprintf(stderr, "Failure!\n");
					exit(1);
				}
			}
		}
	}
	exit(0);
}
#endif
Commit	Line	Data
d7b701de TT	1	/*
d7b701de TT	2	* feature.c --- convert between features and strings
efc6f628	3	*
d7b701de	4	* Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu>
efc6f628	5	*
543547a5 TT	6	* %Begin-Header%
	7	* This file may be redistributed under the terms of the GNU Library
	8	* General Public License, version 2.
	9	* %End-Header%
d7b701de TT	10	*/
d7b701de TT	11
d1154eb4	12	#include "config.h"
d7b701de TT	13	#include <stdio.h>
	14	#include <stdlib.h>
	15	#include <string.h>
36caf25f	16	#include <ctype.h>
d7b701de TT	17	#include <errno.h>
	18
	19	#include "e2p.h"
03efde8a AD	20	#include <ext2fs/ext2fs.h>
03efde8a AD	21	#include <ext2fs/jfs_user.h>
d7b701de	22
d7b701de TT	23	struct feature {
	24	int compat;
	25	unsigned int mask;
36caf25f	26	const char *string;
d7b701de TT	27	};
d7b701de TT	28
e2207ce5	29	static struct feature feature_list[] = {
d7b701de TT	30	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,
	31	"dir_prealloc" },
	32	{ E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
	33	"has_journal" },
	34	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
	35	"imagic_inodes" },
342d847d TT	36	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,
342d847d TT	37	"ext_attr" },
49d5ddcc TT	38	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,
	39	"dir_index" },
	40	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
	41	"resize_inode" },
f5fa2007 TT	42	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_LAZY_BG,
f5fa2007 TT	43	"lazy_bg" },
89efc88e	44	{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
16c581d0	45	"snapshot_bitmap" },
65c6c3e0 TT	46	{ E2P_FEATURE_COMPAT, EXT4_FEATURE_COMPAT_SPARSE_SUPER2,
65c6c3e0 TT	47	"sparse_super2" },
477007e1	48
d7b701de TT	49	{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
	50	"sparse_super" },
	51	{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
	52	"large_file" },
477007e1 TT	53	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_HUGE_FILE,
477007e1 TT	54	"huge_file" },
2930dad2 TT	55	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
2930dad2 TT	56	"uninit_bg" },
477007e1	57	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
3542ba0d	58	"uninit_groups" },
477007e1 TT	59	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_DIR_NLINK,
	60	"dir_nlink" },
	61	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE,
	62	"extra_isize" },
0edcc270 AK	63	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_QUOTA,
0edcc270 AK	64	"quota" },
412376ef TT	65	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_BIGALLOC,
412376ef TT	66	"bigalloc"},
89efc88e TT	67	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM,
89efc88e TT	68	"metadata_csum"},
991211f6 TT	69	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_REPLICA,
991211f6 TT	70	"replica" },
8b39e4cf TT	71	{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_READONLY,
8b39e4cf TT	72	"read-only" },
477007e1	73
d7b701de TT	74	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
	75	"compression" },
	76	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
	77	"filetype" },
	78	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
	79	"needs_recovery" },
c2204b32 TT	80	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
c2204b32 TT	81	"journal_dev" },
ba1e1254 TT	82	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
ba1e1254 TT	83	"extent" },
39dc1c45 TT	84	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
39dc1c45 TT	85	"extents" },
c046ac7f TT	86	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
c046ac7f TT	87	"meta_bg" },
477007e1 TT	88	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_64BIT,
477007e1 TT	89	"64bit" },
0f5eba75 AD	90	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_MMP,
0f5eba75 AD	91	"mmp" },
c2d4300b	92	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_FLEX_BG,
0f5eba75	93	"flex_bg"},
660b4c3b TT	94	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_EA_INODE,
	95	"ea_inode"},
	96	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_DIRDATA,
	97	"dirdata"},
	98	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_LARGEDIR,
	99	"large_dir"},
94846158	100	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_INLINE_DATA,
660b4c3b	101	"inline_data"},
22f22ab1 TT	102	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_ENCRYPT,
22f22ab1 TT	103	"encrypt"},
d7b701de TT	104	{ 0, 0, 0 },
	105	};
	106
03efde8a AD	107	static struct feature jrnl_feature_list[] = {
	108	{ E2P_FEATURE_COMPAT, JFS_FEATURE_COMPAT_CHECKSUM,
	109	"journal_checksum" },
	110
	111	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_REVOKE,
	112	"journal_incompat_revoke" },
8c778b3a TT	113	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_64BIT,
8c778b3a TT	114	"journal_64bit" },
03efde8a AD	115	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_ASYNC_COMMIT,
03efde8a AD	116	"journal_async_commit" },
382fad03 DW	117	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V2,
382fad03 DW	118	"journal_checksum_v2" },
38d5adf3 DW	119	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V3,
38d5adf3 DW	120	"journal_checksum_v3" },
03efde8a AD	121	{ 0, 0, 0 },
	122	};
	123
36caf25f	124	const char *e2p_feature2string(int compat, unsigned int mask)
d7b701de TT	125	{
	126	struct feature *f;
	127	static char buf[20];
	128	char fchar;
	129	int fnum;
	130
	131	for (f = feature_list; f->string; f++) {
	132	if ((compat == f->compat) &&
	133	(mask == f->mask))
	134	return f->string;
	135	}
	136	switch (compat) {
	137	case E2P_FEATURE_COMPAT:
	138	fchar = 'C';
	139	break;
	140	case E2P_FEATURE_INCOMPAT:
	141	fchar = 'I';
	142	break;
	143	case E2P_FEATURE_RO_INCOMPAT:
	144	fchar = 'R';
	145	break;
	146	default:
	147	fchar = '?';
	148	break;
	149	}
	150	for (fnum = 0; mask >>= 1; fnum++);
	151	sprintf(buf, "FEATURE_%c%d", fchar, fnum);
	152	return buf;
	153	}
	154
36caf25f	155	int e2p_string2feature(char string, int compat_type, unsigned int *mask)
d7b701de TT	156	{
	157	struct feature *f;
	158	char *eptr;
	159	int num;
	160
	161	for (f = feature_list; f->string; f++) {
	162	if (!strcasecmp(string, f->string)) {
36caf25f	163	*compat_type = f->compat;
d7b701de TT	164	*mask = f->mask;
	165	return 0;
	166	}
	167	}
	168	if (strncasecmp(string, "FEATURE_", 8))
	169	return 1;
	170
	171	switch (string[8]) {
	172	case 'c':
	173	case 'C':
36caf25f	174	*compat_type = E2P_FEATURE_COMPAT;
d7b701de TT	175	break;
	176	case 'i':
	177	case 'I':
36caf25f	178	*compat_type = E2P_FEATURE_INCOMPAT;
d7b701de TT	179	break;
	180	case 'r':
	181	case 'R':
36caf25f	182	*compat_type = E2P_FEATURE_RO_INCOMPAT;
d7b701de TT	183	break;
	184	default:
	185	return 1;
	186	}
	187	if (string[9] == 0)
	188	return 1;
	189	num = strtol(string+9, &eptr, 10);
63cd76d6	190	if (num > 31 \|\| num < 0)
d7b701de TT	191	return 1;
	192	if (*eptr)
	193	return 1;
	194	*mask = 1 << num;
	195	return 0;
	196	}
	197
03efde8a AD	198	const char *e2p_jrnl_feature2string(int compat, unsigned int mask)
	199	{
	200	struct feature *f;
	201	static char buf[20];
	202	char fchar;
	203	int fnum;
	204
	205	for (f = jrnl_feature_list; f->string; f++) {
	206	if ((compat == f->compat) &&
	207	(mask == f->mask))
	208	return f->string;
	209	}
	210	switch (compat) {
	211	case E2P_FEATURE_COMPAT:
	212	fchar = 'C';
	213	break;
	214	case E2P_FEATURE_INCOMPAT:
	215	fchar = 'I';
	216	break;
	217	case E2P_FEATURE_RO_INCOMPAT:
	218	fchar = 'R';
	219	break;
	220	default:
	221	fchar = '?';
	222	break;
	223	}
	224	for (fnum = 0; mask >>= 1; fnum++);
	225	sprintf(buf, "FEATURE_%c%d", fchar, fnum);
	226	return buf;
	227	}
	228
	229	int e2p_jrnl_string2feature(char string, int compat_type, unsigned int *mask)
	230	{
	231	struct feature *f;
	232	char *eptr;
	233	int num;
	234
	235	for (f = jrnl_feature_list; f->string; f++) {
	236	if (!strcasecmp(string, f->string)) {
	237	*compat_type = f->compat;
	238	*mask = f->mask;
	239	return 0;
	240	}
	241	}
	242	if (strncasecmp(string, "FEATURE_", 8))
	243	return 1;
	244
	245	switch (string[8]) {
	246	case 'c':
	247	case 'C':
	248	*compat_type = E2P_FEATURE_COMPAT;
	249	break;
	250	case 'i':
	251	case 'I':
	252	*compat_type = E2P_FEATURE_INCOMPAT;
	253	break;
	254	case 'r':
	255	case 'R':
	256	*compat_type = E2P_FEATURE_RO_INCOMPAT;
	257	break;
	258	default:
	259	return 1;
	260	}
	261	if (string[9] == 0)
262	return 1;
263	num = strtol(string+9, &eptr, 10);
63cd76d6	264	if (num > 31 \|\| num < 0)
03efde8a AD	265	return 1;
	266	if (*eptr)
	267	return 1;
	268	*mask = 1 << num;
	269	return 0;
	270	}
d7b701de TT	271	static char skip_over_blanks(char cp)
	272	{
	273	while (cp && isspace(cp))
	274	cp++;
	275	return cp;
	276	}
	277
36caf25f	278	static char skip_over_word(char cp)
d7b701de	279	{
944ab713	280	while (cp && !isspace(cp) && *cp != ',')
d7b701de TT	281	cp++;
	282	return cp;
	283	}
	284
944ab713 TT	285	/*
	286	* Edit a feature set array as requested by the user. The ok_array,
	287	* if set, allows the application to limit what features the user is
efc6f628	288	* allowed to set or clear using this function. If clear_ok_array is set,
7100351d	289	* then use it tell whether or not it is OK to clear a filesystem feature.
944ab713	290	*/
7100351d	291	int e2p_edit_feature2(const char str, __u32 compat_array, __u32 *ok_array,
efc6f628	292	__u32 clear_ok_array, int type_err,
7100351d	293	unsigned int *mask_err)
d7b701de	294	{
2711ca1c BB	295	char cp, buf, *next;
2711ca1c BB	296	int neg;
36caf25f TT	297	unsigned int mask;
36caf25f TT	298	int compat_type;
2711ca1c	299	int rc = 0;
d7b701de	300
7100351d TT	301	if (!clear_ok_array)
	302	clear_ok_array = ok_array;
	303
	304	if (type_err)
	305	*type_err = 0;
	306	if (mask_err)
	307	*mask_err = 0;
	308
d7b701de	309	buf = malloc(strlen(str)+1);
944ab713	310	if (!buf)
d7b701de	311	return 1;
d7b701de	312	strcpy(buf, str);
9dc6ad1e	313	for (cp = buf; cp && *cp; cp = next ? next+1 : 0) {
d7b701de TT	314	neg = 0;
	315	cp = skip_over_blanks(cp);
	316	next = skip_over_word(cp);
efc6f628	317
d7b701de TT	318	if (*next == 0)
	319	next = 0;
	320	else
	321	*next = 0;
9dc6ad1e TT	322
	323	if ((strcasecmp(cp, "none") == 0) \|\|
	324	(strcasecmp(cp, "clear") == 0)) {
	325	compat_array[0] = 0;
	326	compat_array[1] = 0;
	327	compat_array[2] = 0;
	328	continue;
	329	}
	330
d7b701de TT	331	switch (*cp) {
	332	case '-':
	333	case '^':
	334	neg++;
9e30fb23	335	/* fallthrough */
d7b701de TT	336	case '+':
	337	cp++;
	338	break;
	339	}
2711ca1c BB	340	if (e2p_string2feature(cp, &compat_type, &mask)) {
	341	rc = 1;
	342	break;
	343	}
7100351d	344	if (neg) {
efc6f628	345	if (clear_ok_array &&
7100351d TT	346	!(clear_ok_array[compat_type] & mask)) {
	347	rc = 1;
	348	if (type_err)
efc6f628	349	*type_err = (compat_type \|
7100351d TT	350	E2P_FEATURE_NEGATE_FLAG);
	351	if (mask_err)
	352	*mask_err = mask;
	353	break;
	354	}
36caf25f	355	compat_array[compat_type] &= ~mask;
7100351d TT	356	} else {
	357	if (ok_array && !(ok_array[compat_type] & mask)) {
	358	rc = 1;
	359	if (type_err)
	360	*type_err = compat_type;
	361	if (mask_err)
	362	*mask_err = mask;
	363	break;
	364	}
36caf25f	365	compat_array[compat_type] \|= mask;
7100351d	366	}
d7b701de	367	}
2711ca1c BB	368	free(buf);
2711ca1c BB	369	return rc;
d7b701de	370	}
7100351d TT	371
	372	int e2p_edit_feature(const char str, __u32 compat_array, __u32 *ok_array)
	373	{
	374	return e2p_edit_feature2(str, compat_array, ok_array, 0, 0, 0);
	375	}
03efde8a AD	376
	377	#ifdef TEST_PROGRAM
	378	int main(int argc, char **argv)
	379	{
	380	int compat, compat2, i;
	381	unsigned int mask, mask2;
	382	const char *str;
	383	struct feature *f;
	384
	385	for (i = 0; i < 2; i++) {
	386	if (i == 0) {
	387	f = feature_list;
	388	printf("Feature list:\n");
	389	} else {
	390	printf("\nJournal feature list:\n");
	391	f = jrnl_feature_list;
	392	}
	393	for (; f->string; f++) {
	394	if (i == 0) {
	395	e2p_string2feature((char *)f->string, &compat,
	396	&mask);
	397	str = e2p_feature2string(compat, mask);
	398	} else {
	399	e2p_jrnl_string2feature((char *)f->string,
	400	&compat, &mask);
	401	str = e2p_jrnl_feature2string(compat, mask);
	402	}
	403
	404	printf("\tCompat = %d, Mask = %u, %s\n",
	405	compat, mask, f->string);
	406	if (strcmp(f->string, str)) {
	407	if (e2p_string2feature((char *) str, &compat2,
	408	&mask2) \|\|
	409	(compat2 != compat) \|\|
	410	(mask2 != mask)) {
	411	fprintf(stderr, "Failure!\n");
	412	exit(1);
	413	}
	414	}
	415	}
	416	}
	417	exit(0);
	418	}
	419	#endif