library/time_asctime_r.c
/*
* $Id: time_asctime_r.c,v 1.10 2006-09-25 13:43:06 obarthel Exp $
*
* :ts=4
*
* Portable ISO 'C' (1994) runtime library for the Amiga computer
* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Neither the name of Olaf Barthel nor the names of contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _STDLIB_NULL_POINTER_CHECK_H
#include "stdlib_null_pointer_check.h"
#endif /* _STDLIB_NULL_POINTER_CHECK_H */
/****************************************************************************/
#ifndef _TIME_HEADERS_H
#include "time_headers.h"
#endif /* _TIME_HEADERS_H */
/****************************************************************************/
STATIC VOID
add_to_string(char * to,size_t to_size,const char * string,size_t * offset_ptr)
{
size_t offset,len;
assert( to != NULL && to_size > 0 && string != NULL && offset_ptr != NULL );
offset = (*offset_ptr);
assert( offset < to_size );
len = strlen(string);
if(offset + len > to_size)
len = to_size - offset;
if(len > 0)
{
memmove(&to[offset],string,len);
offset += len;
(*offset_ptr) = offset;
}
}
/****************************************************************************/
char *
__asctime_r(const struct tm *tm,char * buffer,size_t buffer_size)
{
char * result = NULL;
size_t offset = 0;
struct tm copy_tm;
char number[16];
const char * b;
ENTER();
SHOWPOINTER(tm);
assert( tm != NULL || buffer == NULL );
#if defined(CHECK_FOR_NULL_POINTERS)
{
if(tm == NULL || buffer == NULL )
{
__set_errno(EFAULT);
goto out;
}
}
#endif /* CHECK_FOR_NULL_POINTERS */
if(buffer_size == 0)
goto out;
buffer_size--;
/* Fill in the week day if it's not in proper range. */
if(tm->tm_wday < 0 || tm->tm_wday > 6)
{
/* We use a peculiar algorithm rather than falling back onto
mktime() here in order to avoid trouble with skewed results
owing to time zone influence. */
copy_tm = (*tm);
copy_tm.tm_wday = __calculate_weekday(tm->tm_year+1900,tm->tm_mon+1,tm->tm_mday);
tm = ©_tm;
}
assert( 0 <= tm->tm_wday && tm->tm_wday <= 6 );
b = __abbreviated_week_day_names[tm->tm_wday];
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_mon && tm->tm_mon <= 11)
b = __abbreviated_month_names[tm->tm_mon];
else
b = "---";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(1 <= tm->tm_mday && tm->tm_mday <= 31)
b = __number_to_string((unsigned int)tm->tm_mday,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_hour && tm->tm_hour <= 23)
b = __number_to_string((unsigned int)tm->tm_hour,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size,":", &offset);
if(0 <= tm->tm_min && tm->tm_min <= 59)
b = __number_to_string((unsigned int)tm->tm_min,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size,":", &offset);
if(0 <= tm->tm_sec && tm->tm_sec <= 59)
b = __number_to_string((unsigned int)tm->tm_sec,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_year)
b = __number_to_string((unsigned int)1900 + tm->tm_year,number,sizeof(number),0);
else
b = "----";
add_to_string(buffer,buffer_size,b,&offset);
SHOWSTRING(buffer);
add_to_string(buffer,buffer_size,"\n",&offset);
assert( offset <= buffer_size );
buffer[offset] = '\0';
result = buffer;
out:
RETURN(result);
return(result);
}
/****************************************************************************/
char *
asctime_r(const struct tm *tm,char * buffer)
{
char * result;
ENTER();
result = __asctime_r(tm,buffer,40);
RETURN(result);
return(result);
}