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util.c revision 1.7 
      1 /*	$NetBSD: util.c,v 1.7 1997/10/18 12:49:17 lukem Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1988, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)util.c	8.4 (Berkeley) 4/2/94";
     40 #else
     41 __RCSID("$NetBSD: util.c,v 1.7 1997/10/18 12:49:17 lukem Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 
     47 #include <ctype.h>
     48 #include <pwd.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <time.h>
     53 #include <tzfile.h>
     54 #include <unistd.h>
     55 
     56 #include "chpass.h"
     57 #include "pathnames.h"
     58 
     59 static int dmsize[] =
     60 	{ -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
     61 static char *months[] =
     62 	{ "January", "February", "March", "April", "May", "June",
     63 	  "July", "August", "September", "October", "November",
     64 	  "December", NULL };
     65 
     66 char *
     67 ttoa(tval)
     68 	time_t tval;
     69 {
     70 	struct tm *tp;
     71 	static char tbuf[50];
     72 
     73 	if (tval) {
     74 		tp = localtime(&tval);
     75 		(void)snprintf(tbuf, sizeof tbuf, "%s %d, %d", months[tp->tm_mon],
     76 		    tp->tm_mday, tp->tm_year + TM_YEAR_BASE);
     77 	}
     78 	else
     79 		*tbuf = '\0';
     80 	return (tbuf);
     81 }
     82 
     83 int
     84 atot(p, store)
     85 	char *p;
     86 	time_t *store;
     87 {
     88 	static struct tm *lt;
     89 	char *t, **mp;
     90 	time_t tval;
     91 	int day, month, year;
     92 
     93 	if (!*p) {
     94 		*store = 0;
     95 		return (0);
     96 	}
     97 	if (!lt) {
     98 		unsetenv("TZ");
     99 		(void)time(&tval);
    100 		lt = localtime(&tval);
    101 	}
    102 	if (!(t = strtok(p, " \t")))
    103 		goto bad;
    104 	for (mp = months;; ++mp) {
    105 		if (!*mp)
    106 			goto bad;
    107 		if (!strncasecmp(*mp, t, 3)) {
    108 			month = mp - months + 1;
    109 			break;
    110 		}
    111 	}
    112 	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
    113 		goto bad;
    114 	day = atoi(t);
    115 	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
    116 		goto bad;
    117 	year = atoi(t);
    118 	if (day < 1 || day > 31 || month < 1 || month > 12 || !year)
    119 		goto bad;
    120 	if (year < 100)
    121 		year += TM_YEAR_BASE;
    122 	if (year <= EPOCH_YEAR)
    123 bad:		return (1);
    124 	tval = isleap(year) && month > 2;
    125 	for (--year; year >= EPOCH_YEAR; --year)
    126 		tval += isleap(year) ?
    127 		    DAYSPERLYEAR : DAYSPERNYEAR;
    128 	while (--month)
    129 		tval += dmsize[month];
    130 	tval += day;
    131 	tval = tval * HOURSPERDAY * MINSPERHOUR * SECSPERMIN;
    132 	tval -= lt->tm_gmtoff;
    133 	*store = tval;
    134 	return (0);
    135 }
    136 
    137 char *
    138 ok_shell(name)
    139 	char *name;
    140 {
    141 	char *p, *sh;
    142 
    143 	setusershell();
    144 	while ((sh = getusershell()) != NULL) {
    145 		if (!strcmp(name, sh))
    146 			return (name);
    147 		/* allow just shell name, but use "real" path */
    148 		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
    149 			return (sh);
    150 	}
    151 	return (NULL);
    152 }
    153