1 /* 2 ** This file is in the public domain, so clarified as of 3 ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). 4 */ 5 6 #if defined(LIBC_SCCS) && !defined(lint) && !defined(NOID) 7 static char elsieid[] = "@(#)asctime.c 7.9"; 8 static char rcsid[] = "$OpenBSD: asctime.c,v 1.7 2000/01/06 08:24:17 d Exp $"; 9 #endif /* LIBC_SCCS and not lint */ 10 11 /*LINTLIBRARY*/ 12 13 #include "private.h" 14 #include "tzfile.h" 15 #include "thread_private.h" 16 17 /* 18 ** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, Second Edition, 1996-07-12. 19 */ 20 21 char * 22 asctime_r(timeptr, buf) 23 register const struct tm * timeptr; 24 char * buf; 25 { 26 static const char wday_name[][3] = { 27 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 28 }; 29 static const char mon_name[][3] = { 30 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 31 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 32 }; 33 register const char * wn; 34 register const char * mn; 35 int size; 36 37 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK) 38 wn = "???"; 39 else wn = wday_name[timeptr->tm_wday]; 40 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR) 41 mn = "???"; 42 else mn = mon_name[timeptr->tm_mon]; 43 /* 44 ** The X3J11-suggested format is 45 ** "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n" 46 ** Since the .2 in 02.2d is ignored, we drop it. 47 */ 48 /* 49 * P1003 8.3.5.2 says that asctime_r() can only assume at most 50 * a 26 byte buffer. *XXX* 51 */ 52 size = snprintf(buf, 26, "%.3s %.3s%3d %02d:%02d:%02d %d\n", 53 wn, mn, 54 timeptr->tm_mday, timeptr->tm_hour, 55 timeptr->tm_min, timeptr->tm_sec, 56 TM_YEAR_BASE + timeptr->tm_year); 57 if (size >= 26) 58 return NULL; 59 return buf; 60 } 61 62 /* 63 ** A la X3J11, with core dump avoidance. 64 */ 65 66 char * 67 asctime(timeptr) 68 const struct tm * timeptr; 69 { 70 /* asctime_r won't exceed this buffer: */ 71 static char result[26]; 72 _THREAD_PRIVATE_KEY(asctime); 73 char *resultp = (char*) _THREAD_PRIVATE(asctime, result, NULL); 74 75 if (resultp == NULL) 76 return NULL; 77 else 78 return asctime_r(timeptr, resultp); 79 } 80