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util.c revision 1.6 
      1 /*	$NetBSD: util.c,v 1.6 1997/07/25 06:38:02 mikel 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 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)util.c	8.4 (Berkeley) 4/2/94";
     39 #else
     40 static char rcsid[] = "$NetBSD: util.c,v 1.6 1997/07/25 06:38:02 mikel Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 
     46 #include <ctype.h>
     47 #include <pwd.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <time.h>
     52 #include <tzfile.h>
     53 #include <unistd.h>
     54 
     55 #include "chpass.h"
     56 #include "pathnames.h"
     57 
     58 static int dmsize[] =
     59 	{ -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
     60 static char *months[] =
     61 	{ "January", "February", "March", "April", "May", "June",
     62 	  "July", "August", "September", "October", "November",
     63 	  "December", NULL };
     64 
     65 char *
     66 ttoa(tval)
     67 	time_t tval;
     68 {
     69 	struct tm *tp;
     70 	static char tbuf[50];
     71 
     72 	if (tval) {
     73 		tp = localtime(&tval);
     74 		(void)snprintf(tbuf, sizeof tbuf, "%s %d, %d", months[tp->tm_mon],
     75 		    tp->tm_mday, tp->tm_year + TM_YEAR_BASE);
     76 	}
     77 	else
     78 		*tbuf = '\0';
     79 	return (tbuf);
     80 }
     81 
     82 int
     83 atot(p, store)
     84 	char *p;
     85 	time_t *store;
     86 {
     87 	static struct tm *lt;
     88 	char *t, **mp;
     89 	time_t tval;
     90 	int day, month, year;
     91 
     92 	if (!*p) {
     93 		*store = 0;
     94 		return (0);
     95 	}
     96 	if (!lt) {
     97 		unsetenv("TZ");
     98 		(void)time(&tval);
     99 		lt = localtime(&tval);
    100 	}
    101 	if (!(t = strtok(p, " \t")))
    102 		goto bad;
    103 	for (mp = months;; ++mp) {
    104 		if (!*mp)
    105 			goto bad;
    106 		if (!strncasecmp(*mp, t, 3)) {
    107 			month = mp - months + 1;
    108 			break;
    109 		}
    110 	}
    111 	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
    112 		goto bad;
    113 	day = atoi(t);
    114 	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
    115 		goto bad;
    116 	year = atoi(t);
    117 	if (day < 1 || day > 31 || month < 1 || month > 12 || !year)
    118 		goto bad;
    119 	if (year < 100)
    120 		year += TM_YEAR_BASE;
    121 	if (year <= EPOCH_YEAR)
    122 bad:		return (1);
    123 	tval = isleap(year) && month > 2;
    124 	for (--year; year >= EPOCH_YEAR; --year)
    125 		tval += isleap(year) ?
    126 		    DAYSPERLYEAR : DAYSPERNYEAR;
    127 	while (--month)
    128 		tval += dmsize[month];
    129 	tval += day;
    130 	tval = tval * HOURSPERDAY * MINSPERHOUR * SECSPERMIN;
    131 	tval -= lt->tm_gmtoff;
    132 	*store = tval;
    133 	return (0);
    134 }
    135 
    136 char *
    137 ok_shell(name)
    138 	char *name;
    139 {
    140 	char *p, *sh;
    141 
    142 	setusershell();
    143 	while ((sh = getusershell()) != NULL) {
    144 		if (!strcmp(name, sh))
    145 			return (name);
    146 		/* allow just shell name, but use "real" path */
    147 		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
    148 			return (sh);
    149 	}
    150 	return (NULL);
    151 }
    152