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-rw-r--r--contrib/mount/mntent.c266
1 files changed, 155 insertions, 111 deletions
diff --git a/contrib/mount/mntent.c b/contrib/mount/mntent.c
index e9b4488..9a7e5f3 100644
--- a/contrib/mount/mntent.c
+++ b/contrib/mount/mntent.c
@@ -36,6 +36,7 @@
*/
#if !defined(GF_LINUX_HOST_OS)
+
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
@@ -49,166 +50,209 @@ typedef struct statvfs gf_statfs_t;
typedef struct statfs gf_statfs_t;
#endif
-static int pos = -1;
-static int mntsize = -1;
-static struct mntent _mntent;
+typedef struct _mntent_state {
+ struct mntent mntent;
+ gf_statfs_t *statfs;
+ int count;
+ int pos;
+ /* A buffer big enough to store all defined flags as a string.
+ * Increase it if necessary when more flags are defined. */
+ char buf[256];
+} mntent_state_t;
+
+typedef struct _mntflag {
+ unsigned long value;
+ const char *on;
+ const char *off;
+} mntflag_t;
+
+static mntflag_t mntflags[] = {
+ { MNT_RDONLY, "ro", "rw" },
+ { MNT_SYNCHRONOUS, "sync", NULL },
+ { MNT_NOEXEC, "noexec", NULL },
+ { MNT_NOSUID, "nosuid", NULL },
+#if !defined(__FreeBSD__)
+ { MNT_NODEV, "nodev", NULL },
+#endif /* __FreeBSD__ */
+ { MNT_UNION, "union", NULL },
+ { MNT_ASYNC, "async", NULL },
+#if !defined(GF_DARWIN_HOST_OS)
+ { MNT_NOATIME, "noatime", NULL },
+#if !defined(__NetBSD__)
+ { MNT_NOCLUSTERR, "noclusterr", NULL },
+ { MNT_NOCLUSTERW, "noclusterw", NULL },
+ { MNT_NOSYMFOLLOW, "nosymfollow", NULL },
+ { MNT_SUIDDIR, "suiddir", NULL },
+#endif /* !__NetBSD__ */
+#endif /* !GF_DARWIN_HOST_OS */
+ { 0, NULL, NULL }
+};
char *
hasmntopt (const struct mntent *mnt, const char *option)
{
- int found;
char *opt, *optbuf;
+ int len;
optbuf = strdup(mnt->mnt_opts);
- found = 0;
- for (opt = optbuf; (opt = strtok(opt, " ")) != NULL; opt = NULL) {
- if (!strcasecmp(opt, option)) {
- opt = opt - optbuf + mnt->mnt_opts;
- free (optbuf);
- return (opt);
+ if (optbuf == NULL) {
+ return NULL;
+ }
+
+ opt = optbuf;
+ len = 0;
+ while (*opt) {
+ while (opt[len] != 0) {
+ if (opt[len] == ' ') {
+ opt[len++] = 0;
+ break;
+ }
+ len++;
+ }
+ if ((*opt != 0) && (strcasecmp(opt, option) == 0)) {
+ break;
}
+ opt += len;
+ len = 0;
}
- free (optbuf);
- return (NULL);
+ free(optbuf);
+ if (len == 0) {
+ return NULL;
+ }
+
+ return opt - optbuf + mnt->mnt_opts;
}
-static char *
-concatopt (char *s0, const char *s1)
+static int
+writeopt(const char *text, char *buf, int buflen, int pos)
{
- size_t i;
- char *cp;
-
- if (s1 == NULL || *s1 == '\0')
- return s0;
- if (s0 && *s0) {
- i = strlen(s0) + strlen(s1) + 1 + 1;
- if ((cp = (char *)malloc(i)) == NULL)
- return (NULL);
- (void)snprintf(cp, i, "%s %s", s0, s1);
- } else
- cp = strdup(s1);
-
- if (s0)
- free(s0);
- return (cp);
-}
+ int len;
+
+ /* buflen must be > 0 */
+
+ if (text == NULL) {
+ return pos;
+ }
+
+ buf += pos;
+ if (pos > 0) {
+ /* We are sure we have at least one byte to store the space.
+ * We don't need to check buflen here. */
+ *buf++ = ' ';
+ pos++;
+ }
+ len = strlen(text) + 1;
+ pos += len;
+ if (pos >= buflen) {
+ /* There won't be enough space for the text and the
+ * terminating null character. We copy as much as we can
+ * of the text and mark the end of the string with '...' */
+ memcpy(buf, text, buflen - pos + len);
+ if (buflen > 3) {
+ strcpy(buf + buflen - 4, "...");
+ } else {
+ strncpy(buf, "...", buflen - 1);
+ buf[buflen - 1] = 0;
+ }
+ pos = buflen;
+ } else {
+ memcpy(buf, text, len);
+ }
+ return pos;
+}
static char *
-flags2opts (int flags)
+flags2opts (int flags, char *buf, int buflen)
{
- char *res;
- res = NULL;
- res = concatopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
- if (flags & MNT_SYNCHRONOUS) res = concatopt(res, "sync");
- if (flags & MNT_NOEXEC) res = concatopt(res, "noexec");
- if (flags & MNT_NOSUID) res = concatopt(res, "nosuid");
-#if !defined(__FreeBSD__)
- if (flags & MNT_NODEV) res = concatopt(res, "nodev");
-#endif /* __FreeBSD__ */
- if (flags & MNT_UNION) res = concatopt(res, "union");
- if (flags & MNT_ASYNC) res = concatopt(res, "async");
-#if !defined(GF_DARWIN_HOST_OS)
- if (flags & MNT_NOATIME) res = concatopt(res, "noatime");
-#if !defined(__NetBSD__)
- if (flags & MNT_NOCLUSTERR) res = concatopt(res, "noclusterr");
- if (flags & MNT_NOCLUSTERW) res = concatopt(res, "noclusterw");
- if (flags & MNT_NOSYMFOLLOW) res = concatopt(res, "nosymfollow");
- if (flags & MNT_SUIDDIR) res = concatopt(res, "suiddir");
-#endif /* !__NetBSD__ */
-#endif /* !GF_DARWIN_HOS_OS */
- return res;
+ char other[16];
+ mntflag_t *flg;
+ int pos;
+
+ if (buflen == 0) {
+ return NULL;
+ }
+
+ pos = 0;
+ for (flg = mntflags; flg->value != 0; flg++) {
+ pos = writeopt((flags & flg->value) == 0 ? flg->off : flg->on,
+ buf, buflen, pos);
+ flags &= ~flg->value;
+ }
+
+ if (flags != 0) {
+ sprintf(other, "[0x%x]", flags);
+ writeopt(other, buf, buflen, pos);
+ }
+
+ return buf;
}
-static struct mntent *
-statfs_to_mntent (gf_statfs_t *mntbuf)
+static void
+statfs_to_mntent (struct mntent *mntent, gf_statfs_t *mntbuf, char *buf,
+ int buflen)
{
- static char opts_buf[40], *tmp;
int f_flags;
- _mntent.mnt_fsname = mntbuf->f_mntfromname;
- _mntent.mnt_dir = mntbuf->f_mntonname;
- _mntent.mnt_type = mntbuf->f_fstypename;
+ mntent->mnt_fsname = mntbuf->f_mntfromname;
+ mntent->mnt_dir = mntbuf->f_mntonname;
+ mntent->mnt_type = mntbuf->f_fstypename;
#ifdef __NetBSD__
f_flags = mntbuf->f_flag;
#else
f_flags = mntbuf->f_flags;
#endif
- tmp = flags2opts (f_flags);
- if (tmp) {
- opts_buf[sizeof(opts_buf)-1] = '\0';
- strncpy (opts_buf, tmp, sizeof(opts_buf)-1);
- free (tmp);
- } else {
- *opts_buf = '\0';
- }
- _mntent.mnt_opts = opts_buf;
- _mntent.mnt_freq = _mntent.mnt_passno = 0;
- return (&_mntent);
+ mntent->mnt_opts = flags2opts (f_flags, buf, buflen);
+
+ mntent->mnt_freq = mntent->mnt_passno = 0;
}
struct mntent *
-getmntent (FILE *fp)
+getmntent_r (FILE *fp, struct mntent *mntent, char *buf, int buflen)
{
- gf_statfs_t *mntbuf;
+ mntent_state_t *state = (mntent_state_t *)fp;
- if (!fp)
+ if (state->pos >= state->count) {
return NULL;
-
- if (pos == -1 || mntsize == -1)
- mntsize = getmntinfo (&mntbuf, MNT_NOWAIT);
-
- ++pos;
- if (pos == mntsize) {
- pos = mntsize = -1;
- return (NULL);
}
- return (statfs_to_mntent (&mntbuf[pos]));
+ statfs_to_mntent(mntent, &state->statfs[state->pos++], buf, buflen);
+
+ return mntent;
}
-/*
- Careful using this function ``buffer`` and ``bufsize`` are
- ignored since there is no stream with strings to populate
- them on OSX or NetBSD, if one wishes to populate them then
- perhaps a new function should be written in this source file
- which uses 'getmntinfo()' to stringify the mntent's
-*/
-
-struct mntent *getmntent_r (FILE *fp, struct mntent *result,
- char *buffer, int bufsize)
+struct mntent *
+getmntent (FILE *fp)
{
- struct mntent *ment = NULL;
-
- if (!fp)
- return NULL;
+ mntent_state_t *state = (mntent_state_t *)fp;
- flockfile (fp);
- ment = getmntent (fp);
- memcpy (result, ment, sizeof(*ment));
- funlockfile (fp);
-
- return result;
+ return getmntent_r(fp, &state->mntent, state->buf,
+ sizeof(state->buf));
}
FILE *
setmntent (const char *filename, const char *type)
{
- FILE *fp = NULL;
-#ifdef GF_DARWIN_HOST_OS
- fp = fopen (filename, "w");
-#else
- fp = fopen (filename, type);
-#endif
- return fp;
+ mntent_state_t *state;
+
+ /* We don't really need to access any file so we'll use the FILE* as
+ * a fake file to store state information.
+ */
+
+ state = malloc(sizeof(mntent_state_t));
+ if (state != NULL) {
+ state->pos = 0;
+ state->count = getmntinfo(&state->statfs, MNT_NOWAIT);
+ }
+
+ return (FILE *)state;
}
int
endmntent (FILE *fp)
{
- if (fp)
- fclose (fp);
+ free(fp);
return 1; /* endmntent() always returns 1 */
}