nuttx/libs/libc/time/lib_asctimer.c

99 lines
3.3 KiB
C

/****************************************************************************
* libs/libc/time/lib_asctimer.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <nuttx/time.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/* Note: These strings duplicate other definitions in other files. These
* definitions could be combined to save a little FLASH space.
*/
static const char * const g_wday_name[7] =
{
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char * const g_mon_name[12] =
{
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: asctime_r
*
* Description:
* asctime and asctime_r convert the time provided in a struct tm to a
* string representation. asctime is not re-entrant; asctime_r is re-
* entrant.
*
* Input Parameters:
* tp - Pointer to the time to be converted.
* buf - A user provided buffer to receive the 26 character time string.
*
* Returned Value:
* On success, the pointer to the 'buf' is returned; on failure, NULL is
* returned.
*
****************************************************************************/
FAR char *asctime_r(FAR const struct tm *tp, FAR char *buf)
{
char tmp[128];
if (tp == NULL ||
tp->tm_wday >= ARRAY_SIZE(g_wday_name) ||
tp->tm_mon >= ARRAY_SIZE(g_mon_name))
{
return NULL;
}
snprintf(tmp, sizeof(tmp), "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
g_wday_name[tp->tm_wday], g_mon_name[tp->tm_mon],
tp->tm_mday, tp->tm_hour, tp->tm_min, tp->tm_sec,
TM_YEAR_BASE + tp->tm_year);
strlcpy(buf, tmp, 26);
return buf;
}