1 files changed, 136 insertions, 0 deletions

diff --git a/util-linux/e2p/mntopts.c b/util-linux/e2p/mntopts.c
new file mode 100644
index 000000000..6d0eca0ae
--- /dev/null
+++ b/util-linux/e2p/mntopts.c
@@ -0,0 +1,136 @@
+/*
+ * mountopts.c --- convert between default mount options and strings
+ * 
+ * Copyright (C) 2002  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 mntopt {
+        unsigned int    mask;
+        const char      *string;
+};
+
+static struct mntopt mntopt_list[] = {
+        { EXT2_DEFM_DEBUG,      "debug" },
+        { EXT2_DEFM_BSDGROUPS,  "bsdgroups" },
+        { EXT2_DEFM_XATTR_USER, "user_xattr" },
+        { EXT2_DEFM_ACL,        "acl" },
+        { EXT2_DEFM_UID16,      "uid16" },
+        { EXT3_DEFM_JMODE_DATA, "journal_data" },
+        { EXT3_DEFM_JMODE_ORDERED, "journal_data_ordered" },
+        { EXT3_DEFM_JMODE_WBACK, "journal_data_writeback" },
+        { 0, 0 },
+};
+
+const char *e2p_mntopt2string(unsigned int mask)
+{
+        struct mntopt  *f;
+        static char buf[20];
+        int     fnum;
+
+        for (f = mntopt_list; f->string; f++) {
+                if (mask == f->mask)
+                        return f->string;
+        }
+        for (fnum = 0; mask >>= 1; fnum++);
+        sprintf(buf, "MNTOPT_%d", fnum);
+        return buf;
+}
+
+int e2p_string2mntopt(char *string, unsigned int *mask)
+{
+        struct mntopt  *f;
+        char            *eptr;
+        int             num;
+
+        for (f = mntopt_list; f->string; f++) {
+                if (!strcasecmp(string, f->string)) {
+                        *mask = f->mask;
+                        return 0;
+                }
+        }
+        if (strncasecmp(string, "MNTOPT_", 8))
+                return 1;
+
+        if (string[8] == 0)
+                return 1;
+        num = strtol(string+8, &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 mntopt set array as requested by the user.  The ok
+ * parameter, if non-zero, allows the application to limit what
+ * mntopts the user is allowed to set or clear using this function.
+ */
+int e2p_edit_mntopts(const char *str, __u32 *mntopts, __u32 ok)
+{
+        char    *cp, *buf, *next;
+        int     neg;
+        unsigned int    mask;
+
+        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_string2mntopt(cp, &mask))
+                        return 1;
+                if (ok && !(ok & mask))
+                        return 1;
+                if (mask & EXT3_DEFM_JMODE)
+                        *mntopts &= ~EXT3_DEFM_JMODE;
+                if (neg)
+                        *mntopts &= ~mask;
+                else
+                        *mntopts |= mask;
+                cp = next ? next+1 : 0;
+        }
+        return 0;
+}