1 /* $NetBSD: asctime.c,v 1.6 1997/07/13 20:26:47 christos Exp $ */ 2 3 /* 4 ** This file is in the public domain, so clarified as of 5 ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). 6 */ 7 8 #include <sys/cdefs.h> 9 #ifndef lint 10 #ifndef NOID 11 #if 0 12 static char elsieid[] = "@(#)asctime.c 7.8"; 13 #else 14 __RCSID("$NetBSD: asctime.c,v 1.6 1997/07/13 20:26:47 christos Exp $"); 15 #endif 16 #endif /* !defined NOID */ 17 #endif /* !defined lint */ 18 19 /*LINTLIBRARY*/ 20 21 #include "private.h" 22 #include "tzfile.h" 23 24 /* 25 ** A la X3J11, with core dump avoidance. 26 */ 27 28 char * 29 asctime(timeptr) 30 register const struct tm * timeptr; 31 { 32 static const char wday_name[][3] = { 33 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 34 }; 35 static const char mon_name[][3] = { 36 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 37 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 38 }; 39 /* 40 ** Big enough for something such as 41 ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n 42 ** (two three-character abbreviations, five strings denoting integers, 43 ** three explicit spaces, two explicit colons, a newline, 44 ** and a trailing ASCII nul). 45 */ 46 static char result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) + 47 3 + 2 + 1 + 1]; 48 register const char * wn; 49 register const char * mn; 50 51 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK) 52 wn = "???"; 53 else wn = wday_name[timeptr->tm_wday]; 54 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR) 55 mn = "???"; 56 else mn = mon_name[timeptr->tm_mon]; 57 /* 58 ** The X3J11-suggested format is 59 ** "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n" 60 ** Since the .2 in 02.2d is ignored, we drop it. 61 */ 62 (void)snprintf(result, sizeof result,"%.3s %.3s%3d %02d:%02d:%02d %d\n", 63 wn, mn, 64 timeptr->tm_mday, timeptr->tm_hour, 65 timeptr->tm_min, timeptr->tm_sec, 66 TM_YEAR_BASE + timeptr->tm_year); 67 return result; 68 } 69