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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * $Id$
+ ***************************************************************************/
+/*
+ RFC 2616 3.3.1
+
+ Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
+ Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
+ Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
+
+ we support dates without week day name:
+
+ 06 Nov 1994 08:49:37 GMT
+ 06-Nov-94 08:49:37 GMT
+ Nov 6 08:49:37 1994
+
+ and without the time zone (we always assume GMT):
+
+ 06 Nov 1994 08:49:37
+ 06-Nov-94 08:49:37
+
+ or even in weird order:
+
+ 1994 Nov 6 08:49:37 (curl_getdate() and GNU date fails)
+ 08:49:37 06-Nov-94
+ 94 6 Nov 08:49:37 (curl_getdate() and GNU date fails)
+
+*/
+#include "setup.h"
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h> /* for strtol() */
+#endif
+
+#include <curl/curl.h>
+
+
+#include "parsedate.h"
+
+static const char *wkday[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
+static const char *weekday[] = { "Monday", "Tuesday", "Wednesday", "Thursday",
+ "Friday", "Saturday", "Sunday" };
+static const char *month[]= { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
+ "Aug", "Sep", "Oct", "Nov", "Dec" };
+
+static const char *tz[]= { "GMT", "UTC" };
+
+/* returns:
+ -1 no day
+ 0 monday - 6 sunday
+*/
+
+static int checkday(char *check, size_t len)
+{
+ int i;
+ const char **what;
+ bool found= FALSE;
+ if(len > 3)
+ what = &weekday[0];
+ else
+ what = &wkday[0];
+ for(i=0; i<7; i++) {
+ if(curl_strequal(check, what[0])) {
+ found=TRUE;
+ break;
+ }
+ what++;
+ }
+ return found?i:-1;
+}
+
+static int checkmonth(char *check)
+{
+ int i;
+ const char **what;
+ bool found= FALSE;
+
+ what = &month[0];
+ for(i=0; i<12; i++) {
+ if(curl_strequal(check, what[0])) {
+ found=TRUE;
+ break;
+ }
+ what++;
+ }
+ return found?i:-1;
+}
+
+static int checktz(char *check)
+{
+ int i;
+ const char **what;
+ bool found= FALSE;
+
+ what = &tz[0];
+ for(i=0; i<2; i++) {
+ if(curl_strequal(check, what[0])) {
+ found=TRUE;
+ break;
+ }
+ what++;
+ }
+ return found?i:-1;
+}
+
+static void skip(const char **date)
+{
+ /* skip everything that aren't letters or digits */
+ while(**date && !isalnum((int)**date))
+ (*date)++;
+}
+
+#define TM_YEAR_ORIGIN 1900
+
+/* Yield A - B, measured in seconds. (from getdate.y) */
+static long
+difftm (struct tm *a, struct tm *b)
+{
+ int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
+ int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
+ long days = (
+ /* difference in day of year */
+ a->tm_yday - b->tm_yday
+ /* + intervening leap days */
+ + ((ay >> 2) - (by >> 2))
+ - (ay / 100 - by / 100)
+ + ((ay / 100 >> 2) - (by / 100 >> 2))
+ /* + difference in years * 365 */
+ + (long) (ay - by) * 365
+ );
+ return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
+ + (a->tm_min - b->tm_min))
+ + (a->tm_sec - b->tm_sec));
+}
+
+enum assume {
+ DATE_MDAY,
+ DATE_YEAR,
+ DATE_TIME
+};
+
+time_t Curl_parsedate(const char *date)
+{
+ time_t t = 0;
+ int wdaynum=-1; /* day of the week number, 0-6 (mon-sun) */
+ int monnum=-1; /* month of the year number, 0-11 */
+ long mdaynum=-1; /* day of month, 1 - 31 */
+ int hournum=-1;
+ int minnum=-1;
+ int secnum=-1;
+ long yearnum=-1;
+ int tznum=-1;
+ struct tm tm;
+ enum assume dignext = DATE_MDAY;
+
+ int part = 0; /* max 6 parts */
+
+ while(part < 6) {
+ bool found=FALSE;
+
+ skip(&date);
+
+ if(isalpha((int)*date)) {
+ /* a name coming up */
+ char buf[32]="";
+ size_t len;
+ sscanf(date, "%31[^ ,\n\t-]", buf);
+ len = strlen(buf);
+
+ if(wdaynum == -1) {
+ wdaynum = checkday(buf, len);
+ if(wdaynum != -1)
+ found = TRUE;
+ }
+ if(!found && (monnum == -1)) {
+ monnum = checkmonth(buf);
+ if(monnum != -1)
+ found = TRUE;
+ }
+
+ if(!found && (tznum == -1)) {
+ /* this just must be a time zone string */
+ tznum = checktz(buf);
+ if(tznum != -1)
+ found = TRUE;
+ }
+
+ if(!found)
+ return -1; /* bad string */
+
+ date += len;
+ }
+ else if(isdigit((int)*date)) {
+ /* a digit */
+ long val;
+ char *end;
+ if((secnum == -1) &&
+ (3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) {
+ /* time stamp! */
+ date += 8;
+ found = TRUE;
+ }
+ else {
+ val = strtol(date, &end, 10);
+
+ if((dignext == DATE_MDAY) && (mdaynum == -1)) {
+ if((val > 0) && (val<32)) {
+ mdaynum = val;
+ found = TRUE;
+ }
+ dignext = DATE_YEAR;
+ }
+
+ if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
+ yearnum = val;
+ found = TRUE;
+ if(yearnum < 1900) {
+ if (yearnum > 70)
+ yearnum += 1900;
+ else
+ yearnum += 2000;
+ }
+ if(mdaynum == -1)
+ dignext = DATE_MDAY;
+ }
+
+ if(!found)
+ return -1;
+
+ date = end;
+ }
+ }
+
+ part++;
+ }
+
+ tm.tm_sec = secnum;
+ tm.tm_min = minnum;
+ tm.tm_hour = hournum;
+ tm.tm_mday = mdaynum;
+ tm.tm_mon = monnum;
+ tm.tm_year = yearnum - 1900;
+ tm.tm_wday = 0;
+ tm.tm_yday = 0;
+ tm.tm_isdst = 0;
+
+ t = mktime(&tm);
+
+ /* We have the time-stamp now, but in our local time zone, we must now
+ adjust it to GMT. */
+ {
+ struct tm *gmt;
+ long delta;
+#ifdef HAVE_GMTIME_R
+ /* thread-safe version */
+ struct tm keeptime2;
+ gmt = (struct tm *)gmtime_r(&t, &keeptime2);
+#else
+ gmt = gmtime(&t); /* use gmtime_r() if available */
+#endif
+ delta = difftm(&tm, gmt);
+
+ if(t + delta < t)
+ return -1; /* time_t overflow */
+
+ t += delta;
+ }
+
+ return t;
+}
+
+time_t curl_getdate(const char *p, const time_t *now)
+{
+ (void)now;
+ return Curl_parsedate(p);
+}
+
+#ifdef TESTIT
+
+int main(void)
+{
+ char buffer[1024];
+ char cmd[1024];
+ time_t t;
+
+ while(fgets(buffer, sizeof(buffer), stdin)) {
+ size_t len = strlen(buffer);
+
+ buffer[len-1]=0; /* cut off newline */
+
+ t = curl_getdate(buffer, NULL);
+
+ printf("curl_getdate(): %d\n", t);
+
+ sprintf(cmd, "date -d \"%s\" +%%s", buffer);
+
+ printf("GNU date:\n");
+ system(cmd);
+
+ t = parse_a_date(buffer);
+ printf("parse_a_date: %d\n===================\n\n", t);
+ }
+
+ return 0;
+}
+
+#endif
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