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-rw-r--r--lib/cmdline.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/cmdline.c b/lib/cmdline.c
index 76a712e..8f13cf7 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -160,3 +160,32 @@ unsigned long long memparse(const char *ptr, char **retptr)
return ret;
}
EXPORT_SYMBOL(memparse);
+
+/**
+ * parse_option_str - Parse a string and check an option is set or not
+ * @str: String to be parsed
+ * @option: option name
+ *
+ * This function parses a string containing a comma-separated list of
+ * strings like a=b,c.
+ *
+ * Return true if there's such option in the string, or return false.
+ */
+bool parse_option_str(const char *str, const char *option)
+{
+ while (*str) {
+ if (!strncmp(str, option, strlen(option))) {
+ str += strlen(option);
+ if (!*str || *str == ',')
+ return true;
+ }
+
+ while (*str && *str != ',')
+ str++;
+
+ if (*str == ',')
+ str++;
+ }
+
+ return false;
+}
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