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187 lines
3.9 KiB
C
187 lines
3.9 KiB
C
/*
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* feature.c --- convert between features and strings
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*
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* Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu>
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*
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* This file can be redistributed under the terms of the GNU Library General
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* Public License
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include "e2p.h"
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struct feature {
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int compat;
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unsigned int mask;
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const char *string;
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};
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static const struct feature feature_list[] = {
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{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,
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"dir_prealloc" },
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{ E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
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"has_journal" },
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{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
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"imagic_inodes" },
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{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,
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"ext_attr" },
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{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,
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"dir_index" },
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{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
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"resize_inode" },
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{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
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"sparse_super" },
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{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
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"large_file" },
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{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
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"compression" },
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{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
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"filetype" },
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{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
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"needs_recovery" },
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{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
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"journal_dev" },
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{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
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"extents" },
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{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
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"meta_bg" },
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{ 0, 0, 0 },
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};
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const char *e2p_feature2string(int compat, unsigned int mask)
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{
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const struct feature *f;
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static char buf[20];
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char fchar;
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int fnum;
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for (f = feature_list; f->string; f++) {
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if ((compat == f->compat) &&
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(mask == f->mask))
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return f->string;
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}
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switch (compat) {
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case E2P_FEATURE_COMPAT:
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fchar = 'C';
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break;
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case E2P_FEATURE_INCOMPAT:
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fchar = 'I';
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break;
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case E2P_FEATURE_RO_INCOMPAT:
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fchar = 'R';
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break;
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default:
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fchar = '?';
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break;
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}
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for (fnum = 0; mask >>= 1; fnum++);
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sprintf(buf, "FEATURE_%c%d", fchar, fnum);
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return buf;
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}
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int e2p_string2feature(char *string, int *compat_type, unsigned int *mask)
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{
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const struct feature *f;
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char *eptr;
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int num;
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for (f = feature_list; f->string; f++) {
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if (!strcasecmp(string, f->string)) {
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*compat_type = f->compat;
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*mask = f->mask;
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return 0;
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}
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}
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if (strncasecmp(string, "FEATURE_", 8))
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return 1;
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switch (string[8]) {
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case 'c':
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case 'C':
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*compat_type = E2P_FEATURE_COMPAT;
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break;
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case 'i':
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case 'I':
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*compat_type = E2P_FEATURE_INCOMPAT;
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break;
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case 'r':
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case 'R':
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*compat_type = E2P_FEATURE_RO_INCOMPAT;
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break;
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default:
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return 1;
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}
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if (string[9] == 0)
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return 1;
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num = strtol(string+9, &eptr, 10);
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if (num > 32 || num < 0)
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return 1;
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if (*eptr)
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return 1;
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*mask = 1 << num;
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return 0;
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}
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static inline char *skip_over_blanks(char *cp)
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{
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while (*cp && isspace(*cp))
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cp++;
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return cp;
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}
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static inline char *skip_over_word(char *cp)
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{
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while (*cp && !isspace(*cp) && *cp != ',')
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cp++;
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return cp;
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}
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/*
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* Edit a feature set array as requested by the user. The ok_array,
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* if set, allows the application to limit what features the user is
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* allowed to set or clear using this function.
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*/
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int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
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{
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char *cp, *buf, *next;
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int neg;
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unsigned int mask;
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int compat_type;
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buf = bb_xstrdup(str);
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cp = buf;
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while (cp && *cp) {
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neg = 0;
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cp = skip_over_blanks(cp);
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next = skip_over_word(cp);
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if (*next == 0)
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next = 0;
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else
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*next = 0;
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switch (*cp) {
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case '-':
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case '^':
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neg++;
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case '+':
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cp++;
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break;
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}
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if (e2p_string2feature(cp, &compat_type, &mask))
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return 1;
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if (ok_array && !(ok_array[compat_type] & mask))
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return 1;
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if (neg)
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compat_array[compat_type] &= ~mask;
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else
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compat_array[compat_type] |= mask;
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cp = next ? next+1 : 0;
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}
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return 0;
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}
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