260 lines
5.8 KiB
C
260 lines
5.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 1996
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* David L. Nugent. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <ctype.h>
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#include <err.h>
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#include <stdlib.h>
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#include <string.h>
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#include <xlocale.h>
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#include "psdate.h"
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int
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numerics(char const * str)
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{
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return (str[strspn(str, "0123456789x")] == '\0');
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}
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static int
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aindex(char const * arr[], char const ** str, int len)
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{
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int l, i;
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char mystr[32];
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mystr[len] = '\0';
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l = strlen(strncpy(mystr, *str, len));
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for (i = 0; i < l; i++)
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mystr[i] = (char) tolower((unsigned char)mystr[i]);
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for (i = 0; arr[i] && strcmp(mystr, arr[i]) != 0; i++);
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if (arr[i] == NULL)
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i = -1;
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else { /* Skip past it */
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while (**str && isalpha((unsigned char)**str))
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++(*str);
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/* And any following whitespace */
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while (**str && (**str == ',' || isspace((unsigned char)**str)))
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++(*str);
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} /* Return index */
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return i;
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}
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static int
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weekday(char const ** str)
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{
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static char const *days[] =
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{"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL};
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return aindex(days, str, 3);
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}
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static void
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parse_datesub(char const * str, struct tm *t)
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{
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struct tm tm;
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locale_t l;
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int i;
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char *ret;
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const char *valid_formats[] = {
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"%d-%b-%y",
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"%d-%b-%Y",
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"%d-%m-%y",
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"%d-%m-%Y",
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"%H:%M %d-%b-%y",
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"%H:%M %d-%b-%Y",
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"%H:%M %d-%m-%y",
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"%H:%M %d-%m-%Y",
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"%H:%M:%S %d-%b-%y",
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"%H:%M:%S %d-%b-%Y",
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"%H:%M:%S %d-%m-%y",
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"%H:%M:%S %d-%m-%Y",
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"%d-%b-%y %H:%M",
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"%d-%b-%Y %H:%M",
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"%d-%m-%y %H:%M",
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"%d-%m-%Y %H:%M",
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"%d-%b-%y %H:%M:%S",
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"%d-%b-%Y %H:%M:%S",
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"%d-%m-%y %H:%M:%S",
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"%d-%m-%Y %H:%M:%S",
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"%H:%M\t%d-%b-%y",
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"%H:%M\t%d-%b-%Y",
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"%H:%M\t%d-%m-%y",
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"%H:%M\t%d-%m-%Y",
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"%H:%M\t%S %d-%b-%y",
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"%H:%M\t%S %d-%b-%Y",
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"%H:%M\t%S %d-%m-%y",
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"%H:%M\t%S %d-%m-%Y",
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"%d-%b-%y\t%H:%M",
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"%d-%b-%Y\t%H:%M",
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"%d-%m-%y\t%H:%M",
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"%d-%m-%Y\t%H:%M",
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"%d-%b-%y\t%H:%M:%S",
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"%d-%b-%Y\t%H:%M:%S",
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"%d-%m-%y\t%H:%M:%S",
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"%d-%m-%Y\t%H:%M:%S",
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NULL,
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};
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l = newlocale(LC_ALL_MASK, "C", NULL);
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for (i=0; valid_formats[i] != NULL; i++) {
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memset(&tm, 0, sizeof(tm));
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ret = strptime_l(str, valid_formats[i], &tm, l);
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if (ret && *ret == '\0') {
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t->tm_mday = tm.tm_mday;
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t->tm_mon = tm.tm_mon;
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t->tm_year = tm.tm_year;
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t->tm_hour = tm.tm_hour;
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t->tm_min = tm.tm_min;
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t->tm_sec = tm.tm_sec;
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freelocale(l);
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return;
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}
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}
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freelocale(l);
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errx(EXIT_FAILURE, "Invalid date");
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}
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/*-
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* Parse time must be flexible, it handles the following formats:
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* nnnnnnnnnnn UNIX timestamp (all numeric), 0 = now
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* 0xnnnnnnnn UNIX timestamp in hexadecimal
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* 0nnnnnnnnn UNIX timestamp in octal
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* 0 Given time
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* +nnnn[smhdwoy] Given time + nnnn hours, mins, days, weeks, months or years
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* -nnnn[smhdwoy] Given time - nnnn hours, mins, days, weeks, months or years
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* dd[ ./-]mmm[ ./-]yy Date }
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* hh:mm:ss Time } May be combined
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*/
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time_t
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parse_date(time_t dt, char const * str)
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{
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char *p;
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int i;
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long val;
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struct tm *T;
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if (dt == 0)
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dt = time(NULL);
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while (*str && isspace((unsigned char)*str))
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++str;
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if (numerics(str)) {
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dt = strtol(str, &p, 0);
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} else if (*str == '+' || *str == '-') {
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val = strtol(str, &p, 0);
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switch (*p) {
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case 'h':
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case 'H': /* hours */
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dt += (val * 3600L);
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break;
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case '\0':
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case 'm':
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case 'M': /* minutes */
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dt += (val * 60L);
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break;
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case 's':
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case 'S': /* seconds */
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dt += val;
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break;
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case 'd':
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case 'D': /* days */
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dt += (val * 86400L);
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break;
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case 'w':
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case 'W': /* weeks */
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dt += (val * 604800L);
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break;
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case 'o':
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case 'O': /* months */
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T = localtime(&dt);
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T->tm_mon += (int) val;
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i = T->tm_mday;
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goto fixday;
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case 'y':
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case 'Y': /* years */
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T = localtime(&dt);
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T->tm_year += (int) val;
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i = T->tm_mday;
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fixday:
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dt = mktime(T);
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T = localtime(&dt);
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if (T->tm_mday != i) {
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T->tm_mday = 1;
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dt = mktime(T);
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dt -= (time_t) 86400L;
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}
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default: /* unknown */
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break; /* leave untouched */
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}
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} else {
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char *q, tmp[64];
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/*
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* Skip past any weekday prefix
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*/
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weekday(&str);
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strlcpy(tmp, str, sizeof(tmp));
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str = tmp;
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T = localtime(&dt);
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/*
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* See if we can break off any timezone
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*/
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while ((q = strrchr(tmp, ' ')) != NULL) {
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if (strchr("(+-", q[1]) != NULL)
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*q = '\0';
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else {
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int j = 1;
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while (q[j] && isupper((unsigned char)q[j]))
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++j;
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if (q[j] == '\0')
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*q = '\0';
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else
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break;
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}
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}
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parse_datesub(tmp, T);
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dt = mktime(T);
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}
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return dt;
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}
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