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 1.4 2005/01/31 22:29:44 dillon 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(timeptr) 26 const struct tm * timeptr; 27 { 28 static char result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) + 29 3 + 2 + 1 + 1]; 30 return(asctime_r(timeptr, result)); 31 } 32 33 char * 34 asctime_r(timeptr, result) 35 const struct tm * timeptr; 36 char *result; 37 { 38 static const char wday_name[][3] = { 39 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 40 }; 41 static const char mon_name[][3] = { 42 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 43 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 44 }; 45 /* 46 ** Big enough for something such as 47 ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n 48 ** (two three-character abbreviations, five strings denoting integers, 49 ** three explicit spaces, two explicit colons, a newline, 50 ** and a trailing ASCII nul). 51 */ 52 const char * wn; 53 const char * mn; 54 55 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK) 56 wn = "???"; 57 else wn = wday_name[timeptr->tm_wday]; 58 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR) 59 mn = "???"; 60 else mn = mon_name[timeptr->tm_mon]; 61 /* 62 ** The X3J11-suggested format is 63 ** "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n" 64 ** Since the .2 in 02.2d is ignored, we drop it. 65 */ 66 (void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n", 67 wn, mn, 68 timeptr->tm_mday, timeptr->tm_hour, 69 timeptr->tm_min, timeptr->tm_sec, 70 TM_YEAR_BASE + timeptr->tm_year); 71 return result; 72 } 73