FreeBSD-5.3/usr.sbin/pw/psdate.c
/*-
* Copyright (C) 1996
* David L. Nugent. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD: src/usr.sbin/pw/psdate.c,v 1.8 2004/06/17 14:07:16 robert Exp $";
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "psdate.h"
static int
a2i(char const ** str)
{
int i = 0;
char const *s = *str;
if (isdigit((unsigned char)*s)) {
i = atoi(s);
while (isdigit((unsigned char)*s))
++s;
*str = s;
}
return i;
}
static int
numerics(char const * str)
{
int rc = isdigit((unsigned char)*str);
if (rc)
while (isdigit((unsigned char)*str) || *str == 'x')
++str;
return rc && !*str;
}
static int
aindex(char const * arr[], char const ** str, int len)
{
int l, i;
char mystr[32];
mystr[len] = '\0';
l = strlen(strncpy(mystr, *str, len));
for (i = 0; i < l; i++)
mystr[i] = (char) tolower((unsigned char)mystr[i]);
for (i = 0; arr[i] && strcmp(mystr, arr[i]) != 0; i++);
if (arr[i] == NULL)
i = -1;
else { /* Skip past it */
while (**str && isalpha((unsigned char)**str))
++(*str);
/* And any following whitespace */
while (**str && (**str == ',' || isspace((unsigned char)**str)))
++(*str);
} /* Return index */
return i;
}
static int
weekday(char const ** str)
{
static char const *days[] =
{"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL};
return aindex(days, str, 3);
}
static int
month(char const ** str)
{
static char const *months[] =
{"jan", "feb", "mar", "apr", "may", "jun", "jul",
"aug", "sep", "oct", "nov", "dec", NULL};
return aindex(months, str, 3);
}
static void
parse_time(char const * str, int *hour, int *min, int *sec)
{
*hour = a2i(&str);
if ((str = strchr(str, ':')) == NULL)
*min = *sec = 0;
else {
++str;
*min = a2i(&str);
*sec = ((str = strchr(str, ':')) == NULL) ? 0 : atoi(++str);
}
}
static void
parse_datesub(char const * str, int *day, int *mon, int *year)
{
int i;
static char const nchrs[] = "0123456789 \t,/-.";
if ((i = month(&str)) != -1) {
*mon = i;
if ((i = a2i(&str)) != 0)
*day = i;
} else if ((i = a2i(&str)) != 0) {
*day = i;
while (*str && strchr(nchrs + 10, *str) != NULL)
++str;
if ((i = month(&str)) != -1)
*mon = i;
else if ((i = a2i(&str)) != 0)
*mon = i - 1;
} else
return;
while (*str && strchr(nchrs + 10, *str) != NULL)
++str;
if (isdigit((unsigned char)*str)) {
*year = atoi(str);
if (*year > 1900)
*year -= 1900;
else if (*year < 32)
*year += 100;
}
}
/*-
* Parse time must be flexible, it handles the following formats:
* nnnnnnnnnnn UNIX timestamp (all numeric), 0 = now
* 0xnnnnnnnn UNIX timestamp in hexadecimal
* 0nnnnnnnnn UNIX timestamp in octal
* 0 Given time
* +nnnn[smhdwoy] Given time + nnnn hours, mins, days, weeks, months or years
* -nnnn[smhdwoy] Given time - nnnn hours, mins, days, weeks, months or years
* dd[ ./-]mmm[ ./-]yy Date }
* hh:mm:ss Time } May be combined
*/
time_t
parse_date(time_t dt, char const * str)
{
char *p;
int i;
long val;
struct tm *T;
if (dt == 0)
dt = time(NULL);
while (*str && isspace((unsigned char)*str))
++str;
if (numerics(str)) {
dt = strtol(str, &p, 0);
} else if (*str == '+' || *str == '-') {
val = strtol(str, &p, 0);
switch (*p) {
case 'h':
case 'H': /* hours */
dt += (val * 3600L);
break;
case '\0':
case 'm':
case 'M': /* minutes */
dt += (val * 60L);
break;
case 's':
case 'S': /* seconds */
dt += val;
break;
case 'd':
case 'D': /* days */
dt += (val * 86400L);
break;
case 'w':
case 'W': /* weeks */
dt += (val * 604800L);
break;
case 'o':
case 'O': /* months */
T = localtime(&dt);
T->tm_mon += (int) val;
i = T->tm_mday;
goto fixday;
case 'y':
case 'Y': /* years */
T = localtime(&dt);
T->tm_year += (int) val;
i = T->tm_mday;
fixday:
dt = mktime(T);
T = localtime(&dt);
if (T->tm_mday != i) {
T->tm_mday = 1;
dt = mktime(T);
dt -= (time_t) 86400L;
}
default: /* unknown */
break; /* leave untouched */
}
} else {
char *q, tmp[64];
/*
* Skip past any weekday prefix
*/
weekday(&str);
strlcpy(tmp, str, sizeof(tmp));
str = tmp;
T = localtime(&dt);
/*
* See if we can break off any timezone
*/
while ((q = strrchr(tmp, ' ')) != NULL) {
if (strchr("(+-", q[1]) != NULL)
*q = '\0';
else {
int j = 1;
while (q[j] && isupper((unsigned char)q[j]))
++j;
if (q[j] == '\0')
*q = '\0';
else
break;
}
}
/*
* See if there is a time hh:mm[:ss]
*/
if ((p = strchr(tmp, ':')) == NULL) {
/*
* No time string involved
*/
T->tm_hour = T->tm_min = T->tm_sec = 0;
parse_datesub(tmp, &T->tm_mday, &T->tm_mon, &T->tm_year);
} else {
char datestr[64], timestr[64];
/*
* Let's chip off the time string
*/
if ((q = strpbrk(p, " \t")) != NULL) { /* Time first? */
int l = q - str;
strlcpy(timestr, str, l + 1);
strlcpy(datestr, q + 1, sizeof(datestr));
parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec);
parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year);
} else if ((q = strrchr(tmp, ' ')) != NULL) { /* Time last */
int l = q - tmp;
strlcpy(timestr, q + 1, sizeof(timestr));
strlcpy(datestr, tmp, l + 1);
} else /* Bail out */
return dt;
parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec);
parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year);
}
dt = mktime(T);
}
return dt;
}