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-rw-r--r--libc/misc/mntent/mntent.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/libc/misc/mntent/mntent.c b/libc/misc/mntent/mntent.c
index 608f84c..610e35a 100644
--- a/libc/misc/mntent/mntent.c
+++ b/libc/misc/mntent/mntent.c
@@ -1,5 +1,6 @@
/*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ * Copyright (C) 1995-2020 Free Software Foundation, Inc.
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
@@ -92,9 +93,25 @@ int addmntent(FILE * filep, const struct mntent *mnt)
mnt->mnt_type, mnt->mnt_opts, mnt->mnt_freq, mnt->mnt_passno) < 0 ? 1 : 0);
}
-char *hasmntopt(const struct mntent *mnt, const char *opt)
+/* Search MNT->mnt_opts for an option matching OPT.
+ Returns the address of the substring, or null if none found. */
+char *hasmntopt (const struct mntent *mnt, const char *opt)
{
- return strstr(mnt->mnt_opts, opt);
+ const size_t optlen = strlen(opt);
+ char *rest = mnt->mnt_opts, *p;
+
+ while ((p = strstr(rest, opt)) != NULL) {
+ if ((p == rest || p[-1] == ',')
+ && (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ','))
+ return p;
+
+ rest = strchr(p, ',');
+ if (rest == NULL)
+ break;
+ ++rest;
+ }
+
+ return NULL;
}
FILE *setmntent(const char *name, const char *mode)