unit: rand helpers

Sponsored-by: TrueNAS
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@truenas.com>
Closes #18630

tests/unit/unit.c

@@ -24,6 +24,7 @@
 #include <sys/zfs_debug.h>
 
 #include "munit.h"
+#include "unit.h"
 
 /*
  * SET_ERROR() expands to __set_error() in debug builds. It's an
@@ -83,3 +84,22 @@ cmn_err(int ce, const char *fmt, ...)
 		break;
 	}
 }
+
+/* helpers to generate useful random data */
+uint64_t
+unit_rand_uint64(void)
+{
+	uint64_t v =
+	    (((uint64_t)munit_rand_uint32()) << 32) |
+	    ((uint64_t)munit_rand_uint32());
+	return (v);
+}
+
+char *
+unit_rand_str(char *buf, size_t bufsz)
+{
+	for (int i = 0; i < bufsz-1; i++)
+		buf[i] = munit_rand_int_range('a', 'z');
+	buf[bufsz-1] = '\0';
+	return (buf);
+}

tests/unit/unit.h

@@ -57,4 +57,8 @@
 #define	unit_ok(a)	munit_assert_int((a), ==, 0)
 #define	unit_err(a, e)	munit_assert_int((a), ==, (e))
 
+/* helpers to generate useful random data */
+extern uint64_t unit_rand_uint64(void);
+extern char *unit_rand_str(char *buf, size_t bufsz);
+
 #endif /* UNIT_H */