1 files changed, 62 insertions, 0 deletions

diff --git a/tools/lib/string.c b/tools/lib/string.c
new file mode 100644
index 000000000000..065e54f42d8f
--- /dev/null
+++ b/tools/lib/string.c
@@ -0,0 +1,62 @@
+/*
+ *  linux/tools/lib/string.c
+ *
+ *  Copied from linux/lib/string.c, where it is:
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  More specifically, the first copied function was strtobool, which
+ *  was introduced by:
+ *
+ *  d0f1fed29e6e ("Add a strtobool function matching semantics of existing in kernel equivalents")
+ *  Author: Jonathan Cameron <jic23@cam.ac.uk>
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <linux/string.h>
+
+/**
+ * memdup - duplicate region of memory
+ *
+ * @src: memory region to duplicate
+ * @len: memory region length
+ */
+void *memdup(const void *src, size_t len)
+{
+        void *p = malloc(len);
+
+        if (p)
+                memcpy(p, src, len);
+
+        return p;
+}
+
+/**
+ * strtobool - convert common user inputs into boolean values
+ * @s: input string
+ * @res: result
+ *
+ * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
+ * Otherwise it will return -EINVAL.  Value pointed to by res is
+ * updated upon finding a match.
+ */
+int strtobool(const char *s, bool *res)
+{
+        switch (s[0]) {
+        case 'y':
+        case 'Y':
+        case '1':
+                *res = true;
+                break;
+        case 'n':
+        case 'N':
+        case '0':
+                *res = false;
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}