304 lines
7.1 KiB
C
304 lines
7.1 KiB
C
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/*-
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* Copyright (c) 1996 by David L. Nugent <davidn@blaze.net.au>.
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* 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 as
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* the first lines of this file unmodified.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by David L. Nugent.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DAVID L. NUGENT ``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 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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* $Id$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "psdate.h"
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static int
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a2i(char const ** str)
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{
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int i = 0;
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char const *s = *str;
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if (isdigit(*s)) {
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i = atoi(s);
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while (isdigit(*s))
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++s;
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*str = s;
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}
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return i;
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}
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static int
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numerics(char const * str)
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{
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int rc = isdigit(*str);
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if (rc)
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while (isdigit(*str) || *str == 'x')
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++str;
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return rc && !*str;
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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(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(**str))
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++(*str);
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/* And any following whitespace */
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while (**str && (**str == ',' || isspace(**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 int
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month(char const ** str)
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{
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static char const *months[] =
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{"jan", "feb", "mar", "apr", "may", "jun", "jul",
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"aug", "sep", "oct", "nov", "dec", NULL};
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return aindex(months, str, 3);
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}
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static void
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parse_time(char const * str, int *hour, int *min, int *sec)
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{
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*hour = a2i(&str);
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if ((str = strchr(str, ':')) == NULL)
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*min = *sec = 0;
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else {
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++str;
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*min = a2i(&str);
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*sec = ((str = strchr(str, ':')) == NULL) ? 0 : atoi(++str);
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}
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}
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static void
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parse_datesub(char const * str, int *day, int *mon, int *year)
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{
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int i;
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static char const nchrs[] = "0123456789 \t,/-.";
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if ((i = month(&str)) != -1) {
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*mon = i;
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if ((i = a2i(&str)) != 0)
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*day = i;
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} else if ((i = a2i(&str)) != 0) {
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*day = i;
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while (*str && strchr(nchrs + 10, *str) != NULL)
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++str;
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if ((i = month(&str)) != -1)
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*mon = i;
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else if ((i = a2i(&str)) != 0)
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*mon = i - 1;
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} else
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return;
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while (*str && strchr(nchrs + 10, *str) != NULL)
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++str;
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if (isdigit(*str)) {
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*year = atoi(str);
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if (*year > 1900)
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*year -= 1900;
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else if (*year < 32)
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*year += 100;
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}
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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(*str))
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++str;
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if (numerics(str)) {
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val = strtol(str, &p, 0);
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dt = val ? val : dt;
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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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str = strncpy(tmp, str, sizeof tmp - 1);
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tmp[sizeof tmp - 1] = '\0';
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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(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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/*
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* See if there is a time hh:mm[:ss]
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*/
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if ((p = strchr(tmp, ':')) == NULL) {
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/*
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* No time string involved
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*/
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T->tm_hour = T->tm_min = T->tm_sec = 0;
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parse_datesub(tmp, &T->tm_mday, &T->tm_mon, &T->tm_year);
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} else {
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char datestr[64], timestr[64];
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/*
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* Let's chip off the time string
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*/
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if ((q = strpbrk(p, " \t")) != NULL) { /* Time first? */
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int l = q - str;
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strncpy(timestr, str, l);
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timestr[l] = '\0';
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strncpy(datestr, q + 1, sizeof datestr);
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datestr[sizeof datestr - 1] = '\0';
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parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec);
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parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year);
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} else if ((q = strrchr(tmp, ' ')) != NULL) { /* Time last */
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int l = q - tmp;
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strncpy(timestr, q + 1, sizeof timestr);
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timestr[sizeof timestr - 1] = '\0';
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strncpy(datestr, tmp, l);
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datestr[l] = '\0';
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} else /* Bail out */
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return dt;
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parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec);
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parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year);
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}
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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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