From c8c24ae7ab13baff799fc634b7242698cc47dfe3 Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Tue, 24 May 2022 04:47:35 -0400
Subject: [PATCH] [libc] revert back difftime

---
 components/libc/compilers/common/time.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/components/libc/compilers/common/time.c b/components/libc/compilers/common/time.c
index 8deccbba2c..63b4746618 100644
--- a/components/libc/compilers/common/time.c
+++ b/components/libc/compilers/common/time.c
@@ -307,6 +307,14 @@ char* ctime(const time_t *tim_p)
 }
 RTM_EXPORT(ctime);
 
+double difftime(time_t time1, time_t time2)
+{
+    return (double)(time1 - time2);
+}
+RTM_EXPORT(difftime);
+
+RTM_EXPORT(strftime); /* inherent in the toolchain */
+
 /**
  * Returns the current time.
  *
@@ -486,10 +494,6 @@ int settimeofday(const struct timeval *tv, const struct timezone *tz)
 }
 RTM_EXPORT(settimeofday);
 
-/* inherent in the toolchain */
-RTM_EXPORT(difftime);
-RTM_EXPORT(strftime);
-
 #ifdef RT_USING_POSIX_DELAY
 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
 {
-- 
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