[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_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"},
	{	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 > 32 || 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 > 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.  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" },
477007e1	71
d7b701de TT	72	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
	73	"compression" },
	74	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
	75	"filetype" },
	76	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
	77	"needs_recovery" },
c2204b32 TT	78	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
c2204b32 TT	79	"journal_dev" },
ba1e1254 TT	80	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
ba1e1254 TT	81	"extent" },
39dc1c45 TT	82	{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
39dc1c45 TT	83	"extents" },
c046ac7f TT	84	{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
c046ac7f TT	85	"meta_bg" },
477007e1 TT	86	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_64BIT,
477007e1 TT	87	"64bit" },
0f5eba75 AD	88	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_MMP,
0f5eba75 AD	89	"mmp" },
c2d4300b	90	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_FLEX_BG,
0f5eba75	91	"flex_bg"},
660b4c3b TT	92	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_EA_INODE,
	93	"ea_inode"},
	94	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_DIRDATA,
	95	"dirdata"},
	96	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_LARGEDIR,
	97	"large_dir"},
94846158	98	{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_INLINE_DATA,
660b4c3b	99	"inline_data"},
d7b701de TT	100	{ 0, 0, 0 },
	101	};
	102
03efde8a AD	103	static struct feature jrnl_feature_list[] = {
	104	{ E2P_FEATURE_COMPAT, JFS_FEATURE_COMPAT_CHECKSUM,
	105	"journal_checksum" },
	106
	107	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_REVOKE,
	108	"journal_incompat_revoke" },
8c778b3a TT	109	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_64BIT,
8c778b3a TT	110	"journal_64bit" },
03efde8a AD	111	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_ASYNC_COMMIT,
03efde8a AD	112	"journal_async_commit" },
382fad03 DW	113	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V2,
382fad03 DW	114	"journal_checksum_v2" },
38d5adf3 DW	115	{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V3,
38d5adf3 DW	116	"journal_checksum_v3" },
03efde8a AD	117	{ 0, 0, 0 },
	118	};
	119
36caf25f	120	const char *e2p_feature2string(int compat, unsigned int mask)
d7b701de TT	121	{
	122	struct feature *f;
	123	static char buf[20];
	124	char fchar;
	125	int fnum;
	126
	127	for (f = feature_list; f->string; f++) {
	128	if ((compat == f->compat) &&
	129	(mask == f->mask))
	130	return f->string;
	131	}
	132	switch (compat) {
	133	case E2P_FEATURE_COMPAT:
	134	fchar = 'C';
	135	break;
	136	case E2P_FEATURE_INCOMPAT:
	137	fchar = 'I';
	138	break;
	139	case E2P_FEATURE_RO_INCOMPAT:
	140	fchar = 'R';
	141	break;
	142	default:
	143	fchar = '?';
	144	break;
	145	}
	146	for (fnum = 0; mask >>= 1; fnum++);
	147	sprintf(buf, "FEATURE_%c%d", fchar, fnum);
	148	return buf;
	149	}
	150
36caf25f	151	int e2p_string2feature(char string, int compat_type, unsigned int *mask)
d7b701de TT	152	{
	153	struct feature *f;
	154	char *eptr;
	155	int num;
	156
	157	for (f = feature_list; f->string; f++) {
	158	if (!strcasecmp(string, f->string)) {
36caf25f	159	*compat_type = f->compat;
d7b701de TT	160	*mask = f->mask;
	161	return 0;
	162	}
	163	}
	164	if (strncasecmp(string, "FEATURE_", 8))
	165	return 1;
	166
	167	switch (string[8]) {
	168	case 'c':
	169	case 'C':
36caf25f	170	*compat_type = E2P_FEATURE_COMPAT;
d7b701de TT	171	break;
	172	case 'i':
	173	case 'I':
36caf25f	174	*compat_type = E2P_FEATURE_INCOMPAT;
d7b701de TT	175	break;
	176	case 'r':
	177	case 'R':
36caf25f	178	*compat_type = E2P_FEATURE_RO_INCOMPAT;
d7b701de TT	179	break;
	180	default:
	181	return 1;
	182	}
	183	if (string[9] == 0)
	184	return 1;
	185	num = strtol(string+9, &eptr, 10);
	186	if (num > 32 \|\| num < 0)
	187	return 1;
	188	if (*eptr)
	189	return 1;
	190	*mask = 1 << num;
	191	return 0;
	192	}
	193
03efde8a AD	194	const char *e2p_jrnl_feature2string(int compat, unsigned int mask)
	195	{
	196	struct feature *f;
	197	static char buf[20];
	198	char fchar;
	199	int fnum;
	200
	201	for (f = jrnl_feature_list; f->string; f++) {
	202	if ((compat == f->compat) &&
	203	(mask == f->mask))
	204	return f->string;
	205	}
	206	switch (compat) {
	207	case E2P_FEATURE_COMPAT:
	208	fchar = 'C';
	209	break;
	210	case E2P_FEATURE_INCOMPAT:
	211	fchar = 'I';
	212	break;
	213	case E2P_FEATURE_RO_INCOMPAT:
	214	fchar = 'R';
	215	break;
	216	default:
	217	fchar = '?';
	218	break;
	219	}
	220	for (fnum = 0; mask >>= 1; fnum++);
	221	sprintf(buf, "FEATURE_%c%d", fchar, fnum);
	222	return buf;
	223	}
	224
	225	int e2p_jrnl_string2feature(char string, int compat_type, unsigned int *mask)
	226	{
	227	struct feature *f;
	228	char *eptr;
	229	int num;
	230
	231	for (f = jrnl_feature_list; f->string; f++) {
	232	if (!strcasecmp(string, f->string)) {
	233	*compat_type = f->compat;
	234	*mask = f->mask;
	235	return 0;
	236	}
	237	}
	238	if (strncasecmp(string, "FEATURE_", 8))
	239	return 1;
	240
	241	switch (string[8]) {
	242	case 'c':
	243	case 'C':
	244	*compat_type = E2P_FEATURE_COMPAT;
	245	break;
	246	case 'i':
	247	case 'I':
	248	*compat_type = E2P_FEATURE_INCOMPAT;
	249	break;
	250	case 'r':
	251	case 'R':
	252	*compat_type = E2P_FEATURE_RO_INCOMPAT;
	253	break;
	254	default:
	255	return 1;
	256	}
	257	if (string[9] == 0)
258	return 1;
259	num = strtol(string+9, &eptr, 10);
260	if (num > 32 \|\| num < 0)
261	return 1;
262	if (*eptr)
263	return 1;
264	*mask = 1 << num;
265	return 0;
266	}
d7b701de TT	267	static char skip_over_blanks(char cp)
	268	{
	269	while (cp && isspace(cp))
	270	cp++;
	271	return cp;
	272	}
	273
36caf25f	274	static char skip_over_word(char cp)
d7b701de	275	{
944ab713	276	while (cp && !isspace(cp) && *cp != ',')
d7b701de TT	277	cp++;
	278	return cp;
	279	}
	280
944ab713 TT	281	/*
	282	* Edit a feature set array as requested by the user. The ok_array,
	283	* if set, allows the application to limit what features the user is
efc6f628	284	* allowed to set or clear using this function. If clear_ok_array is set,
7100351d	285	* then use it tell whether or not it is OK to clear a filesystem feature.
944ab713	286	*/
7100351d	287	int e2p_edit_feature2(const char str, __u32 compat_array, __u32 *ok_array,
efc6f628	288	__u32 clear_ok_array, int type_err,
7100351d	289	unsigned int *mask_err)
d7b701de	290	{
2711ca1c BB	291	char cp, buf, *next;
2711ca1c BB	292	int neg;
36caf25f TT	293	unsigned int mask;
36caf25f TT	294	int compat_type;
2711ca1c	295	int rc = 0;
d7b701de	296
7100351d TT	297	if (!clear_ok_array)
	298	clear_ok_array = ok_array;
	299
	300	if (type_err)
	301	*type_err = 0;
	302	if (mask_err)
	303	*mask_err = 0;
	304
d7b701de	305	buf = malloc(strlen(str)+1);
944ab713	306	if (!buf)
d7b701de	307	return 1;
d7b701de	308	strcpy(buf, str);
9dc6ad1e	309	for (cp = buf; cp && *cp; cp = next ? next+1 : 0) {
d7b701de TT	310	neg = 0;
	311	cp = skip_over_blanks(cp);
	312	next = skip_over_word(cp);
efc6f628	313
d7b701de TT	314	if (*next == 0)
	315	next = 0;
	316	else
	317	*next = 0;
9dc6ad1e TT	318
	319	if ((strcasecmp(cp, "none") == 0) \|\|
	320	(strcasecmp(cp, "clear") == 0)) {
	321	compat_array[0] = 0;
	322	compat_array[1] = 0;
	323	compat_array[2] = 0;
	324	continue;
	325	}
	326
d7b701de TT	327	switch (*cp) {
	328	case '-':
	329	case '^':
	330	neg++;
9e30fb23	331	/* fallthrough */
d7b701de TT	332	case '+':
	333	cp++;
	334	break;
	335	}
2711ca1c BB	336	if (e2p_string2feature(cp, &compat_type, &mask)) {
	337	rc = 1;
	338	break;
	339	}
7100351d	340	if (neg) {
efc6f628	341	if (clear_ok_array &&
7100351d TT	342	!(clear_ok_array[compat_type] & mask)) {
	343	rc = 1;
	344	if (type_err)
efc6f628	345	*type_err = (compat_type \|
7100351d TT	346	E2P_FEATURE_NEGATE_FLAG);
	347	if (mask_err)
	348	*mask_err = mask;
	349	break;
	350	}
36caf25f	351	compat_array[compat_type] &= ~mask;
7100351d TT	352	} else {
	353	if (ok_array && !(ok_array[compat_type] & mask)) {
	354	rc = 1;
	355	if (type_err)
	356	*type_err = compat_type;
	357	if (mask_err)
	358	*mask_err = mask;
	359	break;
	360	}
36caf25f	361	compat_array[compat_type] \|= mask;
7100351d	362	}
d7b701de	363	}
2711ca1c BB	364	free(buf);
2711ca1c BB	365	return rc;
d7b701de	366	}
7100351d TT	367
	368	int e2p_edit_feature(const char str, __u32 compat_array, __u32 *ok_array)
	369	{
	370	return e2p_edit_feature2(str, compat_array, ok_array, 0, 0, 0);
	371	}
03efde8a AD	372
	373	#ifdef TEST_PROGRAM
	374	int main(int argc, char **argv)
	375	{
	376	int compat, compat2, i;
	377	unsigned int mask, mask2;
	378	const char *str;
	379	struct feature *f;
	380
	381	for (i = 0; i < 2; i++) {
	382	if (i == 0) {
	383	f = feature_list;
	384	printf("Feature list:\n");
	385	} else {
	386	printf("\nJournal feature list:\n");
	387	f = jrnl_feature_list;
	388	}
	389	for (; f->string; f++) {
	390	if (i == 0) {
	391	e2p_string2feature((char *)f->string, &compat,
	392	&mask);
	393	str = e2p_feature2string(compat, mask);
	394	} else {
	395	e2p_jrnl_string2feature((char *)f->string,
	396	&compat, &mask);
	397	str = e2p_jrnl_feature2string(compat, mask);
	398	}
	399
	400	printf("\tCompat = %d, Mask = %u, %s\n",
	401	compat, mask, f->string);
	402	if (strcmp(f->string, str)) {
	403	if (e2p_string2feature((char *) str, &compat2,
	404	&mask2) \|\|
	405	(compat2 != compat) \|\|
	406	(mask2 != mask)) {
	407	fprintf(stderr, "Failure!\n");
	408	exit(1);
	409	}
	410	}
	411	}
	412	}
	413	exit(0);
	414	}
	415	#endif