Return to arpadate.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / usr.sbin / sendmail / src

Annotation of 43BSDReno/usr.sbin/sendmail/src/arpadate.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Eric P. Allman
        !             3:  * Copyright (c) 1988 Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms are permitted provided
        !             7:  * that: (1) source distributions retain this entire copyright notice and
        !             8:  * comment, and (2) distributions including binaries display the following
        !             9:  * acknowledgement:  ``This product includes software developed by the
        !            10:  * University of California, Berkeley and its contributors'' in the
        !            11:  * documentation or other materials provided with the distribution and in
        !            12:  * all advertising materials mentioning features or use of this software.
        !            13:  * Neither the name of the University nor the names of its contributors may
        !            14:  * be used to endorse or promote products derived from this software without
        !            15:  * specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  */
        !            20: 
        !            21: #ifndef lint
        !            22: static char sccsid[] = "@(#)arpadate.c 5.11 (Berkeley) 6/1/90";
        !            23: #endif /* not lint */
        !            24: 
        !            25: # include "conf.h"
        !            26: # include <time.h>
        !            27: # include <sys/types.h>
        !            28: # include "useful.h"
        !            29: 
        !            30: /*
        !            31: **  ARPADATE -- Create date in ARPANET format
        !            32: **
        !            33: **     Parameters:
        !            34: **             ud -- unix style date string.  if NULL, one is created.
        !            35: **
        !            36: **     Returns:
        !            37: **             pointer to an ARPANET date field
        !            38: **
        !            39: **     Side Effects:
        !            40: **             none
        !            41: **
        !            42: **     WARNING:
        !            43: **             date is stored in a local buffer -- subsequent
        !            44: **             calls will overwrite.
        !            45: **
        !            46: **     Bugs:
        !            47: **             Timezone is computed from local time, rather than
        !            48: **             from whereever (and whenever) the message was sent.
        !            49: **             To do better is very hard.
        !            50: **
        !            51: **             Some sites are now inserting the timezone into the
        !            52: **             local date.  This routine should figure out what
        !            53: **             the format is and work appropriately.
        !            54: */
        !            55: 
        !            56: char *
        !            57: arpadate(ud)
        !            58:        register char *ud;
        !            59: {
        !            60:        register char *p;
        !            61:        register char *q;
        !            62:        register int off;
        !            63:        register int i;
        !            64:        register struct tm *lt;
        !            65:        time_t t;
        !            66:        struct tm gmt;
        !            67:        static char b[40];
        !            68:        extern struct tm *localtime(), *gmtime();
        !            69:        extern char *ctime();
        !            70:        extern time_t time();
        !            71: 
        !            72:        /*
        !            73:        **  Get current time.
        !            74:        **      This will be used if a null argument is passed and
        !            75:        **      to resolve the timezone.
        !            76:        */
        !            77: 
        !            78:        (void) time(&t);
        !            79:        if (ud == NULL)
        !            80:                ud = ctime(&t);
        !            81: 
        !            82:        /*
        !            83:        **  Crack the UNIX date line in a singularly unoriginal way.
        !            84:        */
        !            85: 
        !            86:        q = b;
        !            87: 
        !            88:        p = &ud[0];             /* Mon */
        !            89:        *q++ = *p++;
        !            90:        *q++ = *p++;
        !            91:        *q++ = *p++;
        !            92:        *q++ = ',';
        !            93:        *q++ = ' ';
        !            94: 
        !            95:        p = &ud[8];             /* 16 */
        !            96:        if (*p == ' ')
        !            97:                p++;
        !            98:        else
        !            99:                *q++ = *p++;
        !           100:        *q++ = *p++;
        !           101:        *q++ = ' ';
        !           102: 
        !           103:        p = &ud[4];             /* Sep */
        !           104:        *q++ = *p++;
        !           105:        *q++ = *p++;
        !           106:        *q++ = *p++;
        !           107:        *q++ = ' ';
        !           108: 
        !           109:        p = &ud[22];            /* 79 */
        !           110:        *q++ = *p++;
        !           111:        *q++ = *p++;
        !           112:        *q++ = ' ';
        !           113: 
        !           114:        p = &ud[11];            /* 01:03:52 */
        !           115:        for (i = 8; i > 0; i--)
        !           116:                *q++ = *p++;
        !           117: 
        !           118:        /*
        !           119:         * should really get the timezone from the time in "ud" (which
        !           120:         * is only different if a non-null arg was passed which is different
        !           121:         * from the current time), but for all practical purposes, returning
        !           122:         * the current local zone will do (its all that is ever needed).
        !           123:         */
        !           124:        gmt = *gmtime(&t);
        !           125:        lt = localtime(&t);
        !           126: 
        !           127:        off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
        !           128: 
        !           129:        /* assume that offset isn't more than a day ... */
        !           130:        if (lt->tm_year < gmt.tm_year)
        !           131:                off -= 24 * 60;
        !           132:        else if (lt->tm_year > gmt.tm_year)
        !           133:                off += 24 * 60;
        !           134:        else if (lt->tm_yday < gmt.tm_yday)
        !           135:                off -= 24 * 60;
        !           136:        else if (lt->tm_yday > gmt.tm_yday)
        !           137:                off += 24 * 60;
        !           138: 
        !           139:        *q++ = ' ';
        !           140:        if (off == 0) {
        !           141:                *q++ = 'G';
        !           142:                *q++ = 'M';
        !           143:                *q++ = 'T';
        !           144:        } else {
        !           145:                if (off < 0) {
        !           146:                        off = -off;
        !           147:                        *q++ = '-';
        !           148:                } else
        !           149:                        *q++ = '+';
        !           150: 
        !           151:                if (off >= 24*60)               /* should be impossible */
        !           152:                        off = 23*60+59;         /* if not, insert silly value */
        !           153: 
        !           154:                *q++ = (off / 600) + '0';
        !           155:                *q++ = (off / 60) % 10 + '0';
        !           156:                off %= 60;
        !           157:                *q++ = (off / 10) + '0';
        !           158:                *q++ = (off % 10) + '0';
        !           159:        }
        !           160:        *q = '\0';
        !           161: 
        !           162:        return (b);
        !           163: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.