1 /* $NetBSD: asctime.c,v 1.5 1997/06/18 01:12:40 jtc 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 #ifndef lint 9 #ifndef NOID 10 static char elsieid[] = "@(#)asctime.c 7.8"; 11 #endif /* !defined NOID */ 12 #endif /* !defined lint */ 13 14 /*LINTLIBRARY*/ 15 16 #include "private.h" 17 #include "tzfile.h" 18 19 /* 20 ** A la X3J11, with core dump avoidance. 21 */ 22 23 char * 24 asctime(timeptr) 25 register const struct tm * timeptr; 26 { 27 static const char wday_name[][3] = { 28 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 29 }; 30 static const char mon_name[][3] = { 31 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 32 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 33 }; 34 /* 35 ** Big enough for something such as 36 ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n 37 ** (two three-character abbreviations, five strings denoting integers, 38 ** three explicit spaces, two explicit colons, a newline, 39 ** and a trailing ASCII nul). 40 */ 41 static char result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) + 42 3 + 2 + 1 + 1]; 43 register const char * wn; 44 register const char * mn; 45 46 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK) 47 wn = "???"; 48 else wn = wday_name[timeptr->tm_wday]; 49 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR) 50 mn = "???"; 51 else mn = mon_name[timeptr->tm_mon]; 52 /* 53 ** The X3J11-suggested format is 54 ** "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n" 55 ** Since the .2 in 02.2d is ignored, we drop it. 56 */ 57 (void)snprintf(result, sizeof result,"%.3s %.3s%3d %02d:%02d:%02d %d\n", 58 wn, mn, 59 timeptr->tm_mday, timeptr->tm_hour, 60 timeptr->tm_min, timeptr->tm_sec, 61 TM_YEAR_BASE + timeptr->tm_year); 62 return result; 63 } 64