1 /* 2 ** This file is in the public domain, so clarified as of 3 ** June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov). 4 ** 5 ** $FreeBSD: src/lib/libc/stdtime/asctime.c,v 1.7.6.1 2001/03/05 11:37:20 obrien Exp $ 6 ** $DragonFly: src/lib/libc/stdtime/asctime.c,v 1.5 2005/12/04 23:25:40 swildner Exp $ 7 */ 8 9 /* 10 * @(#)asctime.c 7.7 11 */ 12 /*LINTLIBRARY*/ 13 14 #include "namespace.h" 15 #include "private.h" 16 #include "un-namespace.h" 17 #include "tzfile.h" 18 19 /* 20 ** A la X3J11, with core dump avoidance. 21 */ 22 23 24 char * 25 asctime(const struct tm *timeptr) 26 { 27 static char result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) + 28 3 + 2 + 1 + 1]; 29 return(asctime_r(timeptr, result)); 30 } 31 32 char * 33 asctime_r(const struct tm *timeptr, char *result) 34 { 35 static const char wday_name[][3] = { 36 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 37 }; 38 static const char mon_name[][3] = { 39 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 40 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 41 }; 42 /* 43 ** Big enough for something such as 44 ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n 45 ** (two three-character abbreviations, five strings denoting integers, 46 ** three explicit spaces, two explicit colons, a newline, 47 ** and a trailing ASCII nul). 48 */ 49 const char * wn; 50 const char * mn; 51 52 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK) 53 wn = "???"; 54 else wn = wday_name[timeptr->tm_wday]; 55 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR) 56 mn = "???"; 57 else mn = mon_name[timeptr->tm_mon]; 58 /* 59 ** The X3J11-suggested format is 60 ** "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n" 61 ** Since the .2 in 02.2d is ignored, we drop it. 62 */ 63 sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n", 64 wn, mn, 65 timeptr->tm_mday, timeptr->tm_hour, 66 timeptr->tm_min, timeptr->tm_sec, 67 TM_YEAR_BASE + timeptr->tm_year); 68 return result; 69 } 70