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-rw-r--r--e2fsprogs/e2p/feature.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/e2fsprogs/e2p/feature.c b/e2fsprogs/e2p/feature.c
new file mode 100644
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--- /dev/null
+++ b/e2fsprogs/e2p/feature.c
@@ -0,0 +1,190 @@
+/*
+ * 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_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)
+{
+ 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;
+}
+