fe94d4354a
Implemented the following: - `asctime_r()` - `asctime()` - `localtime()` - `localtime_r()` - `ctime()` - `ctime_r()` Specifically: - the implementation of `localtime()` & `localtime_r()` simply wraps around the gmtime() & gmtime_r() functions, the results are always expressed as UTC. - `ctime()` is equivalent to `asctime(localtime(clock))`, it inherits the limitation of `localtime()` as well, which only supports UTC results currently. Added tests for these newly implemented functions. Signed-off-by: Yong Cong Sin <ycsin@meta.com> Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 2024 Meta Platforms
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include <zephyr/sys/util.h>
|
|
|
|
#define DATE_STRING_BUF_SZ 26U
|
|
#define DATE_WDAY_STRING_SZ 7U
|
|
#define DATE_MON_STRING_SZ 12U
|
|
#define DATE_TM_YEAR_BASE 1900
|
|
|
|
static char *asctime_impl(const struct tm *tp, char *buf)
|
|
{
|
|
static const char wday_str[DATE_WDAY_STRING_SZ][3] = {
|
|
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
|
|
};
|
|
static const char mon_str[DATE_MON_STRING_SZ][3] = {
|
|
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
|
|
};
|
|
|
|
if ((buf == NULL) || (tp == NULL) || ((unsigned int)tp->tm_wday >= DATE_WDAY_STRING_SZ) ||
|
|
((unsigned int)tp->tm_mon >= DATE_MON_STRING_SZ)) {
|
|
return NULL;
|
|
}
|
|
|
|
unsigned int n = (unsigned int)snprintf(
|
|
buf, DATE_STRING_BUF_SZ, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n", wday_str[tp->tm_wday],
|
|
mon_str[tp->tm_mon], tp->tm_mday, tp->tm_hour, tp->tm_min, tp->tm_sec,
|
|
DATE_TM_YEAR_BASE + tp->tm_year);
|
|
|
|
if (n >= DATE_STRING_BUF_SZ) {
|
|
return NULL;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
char *asctime(const struct tm *tp)
|
|
{
|
|
static char buf[DATE_STRING_BUF_SZ];
|
|
|
|
return asctime_impl(tp, buf);
|
|
}
|
|
|
|
#if defined(CONFIG_COMMON_LIBC_ASCTIME_R)
|
|
char *asctime_r(const struct tm *tp, char *buf)
|
|
{
|
|
return asctime_impl(tp, buf);
|
|
}
|
|
#endif /* CONFIG_COMMON_LIBC_ASCTIME_R */
|