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/*
** This file is in the public domain, so clarified as of
** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
*/
#if defined(LIBC_SCCS) && !defined(lint) && !defined(NOID)
static char elsieid[] = "@(#)asctime.c 7.22";
static char rcsid[] = "$OpenBSD: asctime.c,v 1.8 2004/10/18 22:33:43 millert Exp $";
#endif /* LIBC_SCCS and not lint */
/*LINTLIBRARY*/
#include "private.h"
#include "tzfile.h"
#include "thread_private.h"
#if STRICTLY_STANDARD_ASCTIME
#define ASCTIME_FMT "%.3s %.3s%3d %.2d:%.2d:%.2d %ld\n"
#define ASCTIME_FMT_B ASCTIME_FMT
#else /* !STRICTLY_STANDARD_ASCTIME */
/*
** Some systems only handle "%.2d"; others only handle "%02d";
** "%02.2d" makes (most) everybody happy.
** At least some versions of gcc warn about the %02.2d; ignore the warning.
*/
/*
** All years associated with 32-bit time_t values are exactly four digits long;
** some years associated with 64-bit time_t values are not.
** Vintage programs are coded for years that are always four digits long
** and may assume that the newline always lands in the same place.
** For years that are less than four digits, we pad the output with
** spaces before the newline to get the newline in the traditional place.
*/
#define ASCTIME_FMT "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %-4ld\n"
/*
** For years that are more than four digits we put extra spaces before the year
** so that code trying to overwrite the newline won't end up overwriting
** a digit within a year and truncating the year (operating on the assumption
** that no output is better than wrong output).
*/
#define ASCTIME_FMT_B "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %ld\n"
#endif /* !STRICTLY_STANDARD_ASCTIME */
#define STD_ASCTIME_BUF_SIZE 26
/*
** Big enough for something such as
** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
** (two three-character abbreviations, five strings denoting integers,
** seven explicit spaces, two explicit colons, a newline,
** and a trailing ASCII nul).
** The values above are for systems where an int is 32 bits and are provided
** as an example; the define below calculates the maximum for the system at
** hand.
*/
#define MAX_ASCTIME_BUF_SIZE (2*3+5*INT_STRLEN_MAXIMUM(int)+7+2+1+1)
static char *
asctime3(timeptr, buf, bufsize)
register const struct tm * timeptr;
char * buf;
int bufsize;
{
static const char wday_name[][3] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char mon_name[][3] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
register const char * wn;
register const char * mn;
long year;
int len;
if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
wn = "???";
else wn = wday_name[timeptr->tm_wday];
if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
mn = "???";
else mn = mon_name[timeptr->tm_mon];
year = timeptr->tm_year + (long) TM_YEAR_BASE;
len = snprintf(buf, bufsize,
((year >= -999 && year <= 9999) ? ASCTIME_FMT : ASCTIME_FMT_B),
wn, mn,
timeptr->tm_mday, timeptr->tm_hour,
timeptr->tm_min, timeptr->tm_sec,
TM_YEAR_BASE + timeptr->tm_year);
if (len < bufsize) {
return buf;
} else {
#ifdef EOVERFLOW
errno = EOVERFLOW;
#else /* !defined EOVERFLOW */
errno = EINVAL;
#endif /* !defined EOVERFLOW */
return NULL;
}
}
/*
** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition.
*/
char *
asctime_r(timeptr, buf)
register const struct tm * timeptr;
char * buf;
{
/*
** P1003 8.3.5.2 says that asctime_r() can only assume at most
** a 26 byte buffer.
*/
return asctime3(timeptr, buf, STD_ASCTIME_BUF_SIZE);
}
/*
** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition.
*/
char *
asctime(timeptr)
const struct tm * timeptr;
{
static char result[MAX_ASCTIME_BUF_SIZE];
_THREAD_PRIVATE_KEY(asctime);
char *resultp = (char *)_THREAD_PRIVATE(asctime, result, NULL);
if (resultp == NULL)
return NULL;
else
return asctime3(timeptr, resultp, sizeof(result));
}
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