[Libc] move gmtime_r api to rt-thread\components\libc\compilers\common

2 files changed, 100 insertions, 0 deletions

diff --git a/components/libc/compilers/common/SConscript b/components/libc/compilers/common/SConscript
new file mode 100644
index 0000000000..02bf49941d
--- /dev/null
+++ b/components/libc/compilers/common/SConscript
@@ -0,0 +1,12 @@
+from building import *
+
+Import('rtconfig')
+
+src   = Glob('*.c')
+cwd   = GetCurrentDir()
+group = []
+CPPPATH = [cwd]
+
+group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], CPPPATH = CPPPATH)
+
+Return('group')
diff --git a/components/libc/compilers/common/gmtime_r.c b/components/libc/compilers/common/gmtime_r.c
new file mode 100644
index 0000000000..dff251ab6c
--- /dev/null
+++ b/components/libc/compilers/common/gmtime_r.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-10-26     zylx         first version
+ */
+
+#if defined(__CC_ARM) || defined(__CLANG_ARM) || defined (__IAR_SYSTEMS_ICC__)  
+#include <sys/time.h>
+
+/* seconds per day */
+#define SPD 24*60*60
+
+/* days per month -- nonleap! */
+const short __spm[13] =
+{
+    0,
+    (31),
+    (31 + 28),
+    (31 + 28 + 31),
+    (31 + 28 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31),
+};
+
+int __isleap(int year)
+{
+    /* every fourth year is a leap year except for century years that are
+     * not divisible by 400. */
+    /*  return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
+    return (!(year % 4) && ((year % 100) || !(year % 400)));
+}
+
+/**
+ * This function will convert Time (Restartable)
+ *
+ * @param timep the timestamp
+ * @param the structure to stores information
+ *
+ * @return the structure to stores information
+ *
+ */
+struct tm *gmtime_r(const time_t *timep, struct tm *r)
+{
+    time_t i;
+    register time_t work = *timep % (SPD);
+    r->tm_sec = work % 60;
+    work /= 60;
+    r->tm_min = work % 60;
+    r->tm_hour = work / 60;
+    work = *timep / (SPD);
+    r->tm_wday = (4 + work) % 7;
+    for (i = 1970;; ++i)
+    {
+        register time_t k = __isleap(i) ? 366 : 365;
+        if (work >= k)
+            work -= k;
+        else
+            break;
+    }
+    r->tm_year = i - 1900;
+    r->tm_yday = work;
+
+    r->tm_mday = 1;
+    if (__isleap(i) && (work > 58))
+    {
+        if (work == 59)
+            r->tm_mday = 2; /* 29.2. */
+        work -= 1;
+    }
+
+    for (i = 11; i && (__spm[i] > work); --i)
+        ;
+    r->tm_mon = i;
+    r->tm_mday += work - __spm[i];
+    return r;
+}
+#endif /* end of __CC_ARM or __CLANG_ARM or __IAR_SYSTEMS_ICC__ */
+