thttpd/tdate_parse.c

/* tdate_parse - parse string dates into internal form, stripped-down version
**
** Copyright © 1995 by Jef Poskanzer <jef@acme.com>.
** 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 THE AUTHOR 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 THE AUTHOR 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.
*/

/* This is a stripped-down version of date_parse.c, available at
** http://www.acme.com/software/date_parse/
*/

#include <sys/types.h>

#include <ctype.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "tdate_parse.h"


struct strlong {
    char* s;
    long l;
    };


static void
pound_case( char* str )
    {
    for ( ; *str != '\0'; ++str )
        {
        if ( isupper( (int) *str ) )
            *str = tolower( (int) *str );
        }
    }

static int
strlong_compare( v1, v2 )
    char* v1;
    char* v2;
    {
    return strcmp( ((struct strlong*) v1)->s, ((struct strlong*) v2)->s );
    }


static int
strlong_search( char* str, struct strlong* tab, int n, long* lP )
    {
    int i, h, l, r;

    l = 0;
    h = n - 1;
    for (;;)
        {
        i = ( h + l ) / 2;
        r = strcmp( str, tab[i].s );
        if ( r < 0 )
            h = i - 1;
        else if ( r > 0 )
            l = i + 1;
        else
            {
            *lP = tab[i].l;
            return 1;
            }
        if ( h < l )
            return 0;
        }
    }


static int
scan_wday( char* str_wday, long* tm_wdayP )
    {
    static struct strlong wday_tab[] = {
        { "sun", 0 }, { "sunday", 0 },
        { "mon", 1 }, { "monday", 1 },
        { "tue", 2 }, { "tuesday", 2 },
        { "wed", 3 }, { "wednesday", 3 },
        { "thu", 4 }, { "thursday", 4 },
        { "fri", 5 }, { "friday", 5 },
        { "sat", 6 }, { "saturday", 6 },
        };
    static int sorted = 0;

    if ( ! sorted )
        {
        (void) qsort(
            wday_tab, sizeof(wday_tab)/sizeof(struct strlong),
            sizeof(struct strlong), strlong_compare );
        sorted = 1;
        }
    pound_case( str_wday );
    return strlong_search(
        str_wday, wday_tab, sizeof(wday_tab)/sizeof(struct strlong), tm_wdayP );
    }


static int
scan_mon( char* str_mon, long* tm_monP )
    {
    static struct strlong mon_tab[] = {
        { "jan", 0 }, { "january", 0 },
        { "feb", 1 }, { "february", 1 },
        { "mar", 2 }, { "march", 2 },
        { "apr", 3 }, { "april", 3 },
        { "may", 4 },
        { "jun", 5 }, { "june", 5 },
        { "jul", 6 }, { "july", 6 },
        { "aug", 7 }, { "august", 7 },
        { "sep", 8 }, { "september", 8 },
        { "oct", 9 }, { "october", 9 },
        { "nov", 10 }, { "november", 10 },
        { "dec", 11 }, { "december", 11 },
        };
    static int sorted = 0;

    if ( ! sorted )
        {
        (void) qsort(
            mon_tab, sizeof(mon_tab)/sizeof(struct strlong),
            sizeof(struct strlong), strlong_compare );
        sorted = 1;
        }
    pound_case( str_mon );
    return strlong_search(
        str_mon, mon_tab, sizeof(mon_tab)/sizeof(struct strlong), tm_monP );
    }


static int
is_leap( int year )
    {
    return year % 400? ( year % 100 ? ( year % 4 ? 0 : 1 ) : 0 ) : 1;
    }


/* Basically the same as mktime(). */
static time_t
tm_to_time( struct tm* tmP )
    {
    time_t t;
    static int monthtab[12] = {
        0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };

    /* Years since epoch, converted to days. */
    t = ( tmP->tm_year - 70 ) * 365;
    /* Leap days for previous years. */
    t += ( tmP->tm_year - 69 ) / 4;
    /* Days for the beginning of this month. */
    t += monthtab[tmP->tm_mon];
    /* Leap day for this year. */
    if ( tmP->tm_mon >= 2 && is_leap( tmP->tm_year + 1900 ) )
        ++t;
    /* Days since the beginning of this month. */
    t += tmP->tm_mday - 1;      /* 1-based field */
    /* Hours, minutes, and seconds. */
    t = t * 24 + tmP->tm_hour;
    t = t * 60 + tmP->tm_min;
    t = t * 60 + tmP->tm_sec;

    return t;
    }


time_t
tdate_parse( char* str )
    {
    struct tm tm;
    char* cp;
    char str_mon[500], str_wday[500];
    int tm_sec, tm_min, tm_hour, tm_mday, tm_year;
    long tm_mon, tm_wday;
    time_t t;

    /* Initialize. */
    memset( (char*) &tm, 0, sizeof(struct tm) );

    /* Skip initial whitespace ourselves - sscanf is clumsy at this. */
    for ( cp = str; *cp == ' ' || *cp == '\t'; ++cp )
        continue;

    /* And do the sscanfs.  WARNING: you can add more formats here,
    ** but be careful!  You can easily screw up the parsing of existing
    ** formats when you add new ones.  The order is important.
    */

    /* DD-mth-YY HH:MM:SS GMT */
    if ( sscanf( cp, "%d-%400[a-zA-Z]-%d %d:%d:%d GMT",
                &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
                &tm_sec ) == 6 &&
            scan_mon( str_mon, &tm_mon ) )
        {
        tm.tm_mday = tm_mday;
        tm.tm_mon = tm_mon;
        tm.tm_year = tm_year;
        tm.tm_hour = tm_hour;
        tm.tm_min = tm_min;
        tm.tm_sec = tm_sec;
        }

    /* DD mth YY HH:MM:SS GMT */
    else if ( sscanf( cp, "%d %400[a-zA-Z] %d %d:%d:%d GMT",
                &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
                &tm_sec) == 6 &&
            scan_mon( str_mon, &tm_mon ) )
        {
        tm.tm_mday = tm_mday;
        tm.tm_mon = tm_mon;
        tm.tm_year = tm_year;
        tm.tm_hour = tm_hour;
        tm.tm_min = tm_min;
        tm.tm_sec = tm_sec;
        }

    /* HH:MM:SS GMT DD-mth-YY */
    else if ( sscanf( cp, "%d:%d:%d GMT %d-%400[a-zA-Z]-%d",
                &tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,
                &tm_year ) == 6 &&
            scan_mon( str_mon, &tm_mon ) )
        {
        tm.tm_hour = tm_hour;
        tm.tm_min = tm_min;
        tm.tm_sec = tm_sec;
        tm.tm_mday = tm_mday;
        tm.tm_mon = tm_mon;
        tm.tm_year = tm_year;
        }

    /* HH:MM:SS GMT DD mth YY */
    else if ( sscanf( cp, "%d:%d:%d GMT %d %400[a-zA-Z] %d",
                &tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,
                &tm_year ) == 6 &&
            scan_mon( str_mon, &tm_mon ) )
        {
        tm.tm_hour = tm_hour;
        tm.tm_min = tm_min;
        tm.tm_sec = tm_sec;
        tm.tm_mday = tm_mday;
        tm.tm_mon = tm_mon;
        tm.tm_year = tm_year;
        }

    /* wdy, DD-mth-YY HH:MM:SS GMT */
    else if ( sscanf( cp, "%400[a-zA-Z], %d-%400[a-zA-Z]-%d %d:%d:%d GMT",
                str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
                &tm_sec ) == 7 &&
            scan_wday( str_wday, &tm_wday ) &&
            scan_mon( str_mon, &tm_mon ) )
        {
        tm.tm_wday = tm_wday;
        tm.tm_mday = tm_mday;
        tm.tm_mon = tm_mon;
        tm.tm_year = tm_year;
        tm.tm_hour = tm_hour;
        tm.tm_min = tm_min;
        tm.tm_sec = tm_sec;
        }

    /* wdy, DD mth YY HH:MM:SS GMT */
    else if ( sscanf( cp, "%400[a-zA-Z], %d %400[a-zA-Z] %d %d:%d:%d GMT",
                str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
                &tm_sec ) == 7 &&
            scan_wday( str_wday, &tm_wday ) &&
            scan_mon( str_mon, &tm_mon ) )
        {
        tm.tm_wday = tm_wday;
        tm.tm_mday = tm_mday;
        tm.tm_mon = tm_mon;
        tm.tm_year = tm_year;
        tm.tm_hour = tm_hour;
        tm.tm_min = tm_min;
        tm.tm_sec = tm_sec;
        }

    /* wdy mth DD HH:MM:SS GMT YY */
    else if ( sscanf( cp, "%400[a-zA-Z] %400[a-zA-Z] %d %d:%d:%d GMT %d",
                str_wday, str_mon, &tm_mday, &tm_hour, &tm_min, &tm_sec,
                &tm_year ) == 7 &&
            scan_wday( str_wday, &tm_wday ) &&
            scan_mon( str_mon, &tm_mon ) )
        {
        tm.tm_wday = tm_wday;
        tm.tm_mon = tm_mon;
        tm.tm_mday = tm_mday;
        tm.tm_hour = tm_hour;
        tm.tm_min = tm_min;
        tm.tm_sec = tm_sec;
        tm.tm_year = tm_year;
        }
    else
        return (time_t) -1;

    if ( tm.tm_year > 1900 )
        tm.tm_year -= 1900;
    else if ( tm.tm_year < 70 )
        tm.tm_year += 100;

    t = tm_to_time( &tm );

    return t;
    }
Revision:	1.1
Committed:	Mon Jun 18 21:11:57 2001 UTC (22 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	mp_j, dp_j, cp_j, HEAD
Branch point for:	connpatch, dirpatch, mmapppatch
Log Message:	* empty log message *
#	Content
1	/* tdate_parse - parse string dates into internal form, stripped-down version
2	**
3	** Copyright © 1995 by Jef Poskanzer <jef@acme.com>.
4	** All rights reserved.
5	**
6	** Redistribution and use in source and binary forms, with or without
7	** modification, are permitted provided that the following conditions
8	** are met:
9	** 1. Redistributions of source code must retain the above copyright
10	** notice, this list of conditions and the following disclaimer.
11	** 2. Redistributions in binary form must reproduce the above copyright
12	** notice, this list of conditions and the following disclaimer in the
13	** documentation and/or other materials provided with the distribution.
14	**
15	** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16	** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17	** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18	** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19	** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20	** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21	** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22	** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23	** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24	** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25	** SUCH DAMAGE.
26	*/
27
28	/* This is a stripped-down version of date_parse.c, available at
29	** http://www.acme.com/software/date_parse/
30	*/
31
32	#include <sys/types.h>
33
34	#include <ctype.h>
35	#ifdef HAVE_MEMORY_H
36	#include <memory.h>
37	#endif
38	#include <stdio.h>
39	#include <stdlib.h>
40	#include <string.h>
41	#include <time.h>
42
43	#include "tdate_parse.h"
44
45
46	struct strlong {
47	char* s;
48	long l;
49	};
50
51
52	static void
53	pound_case( char* str )
54	{
55	for ( ; *str != '\0'; ++str )
56	{
57	if ( isupper( (int) *str ) )
58	str = tolower( (int) str );
59	}
60	}
61
62	static int
63	strlong_compare( v1, v2 )
64	char* v1;
65	char* v2;
66	{
67	return strcmp( ((struct strlong) v1)->s, ((struct strlong) v2)->s );
68	}
69
70
71	static int
72	strlong_search( char* str, struct strlong* tab, int n, long* lP )
73	{
74	int i, h, l, r;
75
76	l = 0;
77	h = n - 1;
78	for (;;)
79	{
80	i = ( h + l ) / 2;
81	r = strcmp( str, tab[i].s );
82	if ( r < 0 )
83	h = i - 1;
84	else if ( r > 0 )
85	l = i + 1;
86	else
87	{
88	*lP = tab[i].l;
89	return 1;
90	}
91	if ( h < l )
92	return 0;
93	}
94	}
95
96
97	static int
98	scan_wday( char* str_wday, long* tm_wdayP )
99	{
100	static struct strlong wday_tab[] = {
101	{ "sun", 0 }, { "sunday", 0 },
102	{ "mon", 1 }, { "monday", 1 },
103	{ "tue", 2 }, { "tuesday", 2 },
104	{ "wed", 3 }, { "wednesday", 3 },
105	{ "thu", 4 }, { "thursday", 4 },
106	{ "fri", 5 }, { "friday", 5 },
107	{ "sat", 6 }, { "saturday", 6 },
108	};
109	static int sorted = 0;
110
111	if ( ! sorted )
112	{
113	(void) qsort(
114	wday_tab, sizeof(wday_tab)/sizeof(struct strlong),
115	sizeof(struct strlong), strlong_compare );
116	sorted = 1;
117	}
118	pound_case( str_wday );
119	return strlong_search(
120	str_wday, wday_tab, sizeof(wday_tab)/sizeof(struct strlong), tm_wdayP );
121	}
122
123
124	static int
125	scan_mon( char* str_mon, long* tm_monP )
126	{
127	static struct strlong mon_tab[] = {
128	{ "jan", 0 }, { "january", 0 },
129	{ "feb", 1 }, { "february", 1 },
130	{ "mar", 2 }, { "march", 2 },
131	{ "apr", 3 }, { "april", 3 },
132	{ "may", 4 },
133	{ "jun", 5 }, { "june", 5 },
134	{ "jul", 6 }, { "july", 6 },
135	{ "aug", 7 }, { "august", 7 },
136	{ "sep", 8 }, { "september", 8 },
137	{ "oct", 9 }, { "october", 9 },
138	{ "nov", 10 }, { "november", 10 },
139	{ "dec", 11 }, { "december", 11 },
140	};
141	static int sorted = 0;
142
143	if ( ! sorted )
144	{
145	(void) qsort(
146	mon_tab, sizeof(mon_tab)/sizeof(struct strlong),
147	sizeof(struct strlong), strlong_compare );
148	sorted = 1;
149	}
150	pound_case( str_mon );
151	return strlong_search(
152	str_mon, mon_tab, sizeof(mon_tab)/sizeof(struct strlong), tm_monP );
153	}
154
155
156	static int
157	is_leap( int year )
158	{
159	return year % 400? ( year % 100 ? ( year % 4 ? 0 : 1 ) : 0 ) : 1;
160	}
161
162
163	/* Basically the same as mktime(). */
164	static time_t
165	tm_to_time( struct tm* tmP )
166	{
167	time_t t;
168	static int monthtab[12] = {
169	0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
170
171	/* Years since epoch, converted to days. */
172	t = ( tmP->tm_year - 70 ) * 365;
173	/* Leap days for previous years. */
174	t += ( tmP->tm_year - 69 ) / 4;
175	/* Days for the beginning of this month. */
176	t += monthtab[tmP->tm_mon];
177	/* Leap day for this year. */
178	if ( tmP->tm_mon >= 2 && is_leap( tmP->tm_year + 1900 ) )
179	++t;
180	/* Days since the beginning of this month. */
181	t += tmP->tm_mday - 1; /* 1-based field */
182	/* Hours, minutes, and seconds. */
183	t = t * 24 + tmP->tm_hour;
184	t = t * 60 + tmP->tm_min;
185	t = t * 60 + tmP->tm_sec;
186
187	return t;
188	}
189
190
191	time_t
192	tdate_parse( char* str )
193	{
194	struct tm tm;
195	char* cp;
196	char str_mon[500], str_wday[500];
197	int tm_sec, tm_min, tm_hour, tm_mday, tm_year;
198	long tm_mon, tm_wday;
199	time_t t;
200
201	/* Initialize. */
202	memset( (char*) &tm, 0, sizeof(struct tm) );
203
204	/* Skip initial whitespace ourselves - sscanf is clumsy at this. */
205	for ( cp = str; cp == ' ' \|\| cp == '\t'; ++cp )
206	continue;
207
208	/* And do the sscanfs. WARNING: you can add more formats here,
209	** but be careful! You can easily screw up the parsing of existing
210	** formats when you add new ones. The order is important.
211	*/
212
213	/* DD-mth-YY HH:MM:SS GMT */
214	if ( sscanf( cp, "%d-%400[a-zA-Z]-%d %d:%d:%d GMT",
215	&tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
216	&tm_sec ) == 6 &&
217	scan_mon( str_mon, &tm_mon ) )
218	{
219	tm.tm_mday = tm_mday;
220	tm.tm_mon = tm_mon;
221	tm.tm_year = tm_year;
222	tm.tm_hour = tm_hour;
223	tm.tm_min = tm_min;
224	tm.tm_sec = tm_sec;
225	}
226
227	/* DD mth YY HH:MM:SS GMT */
228	else if ( sscanf( cp, "%d %400[a-zA-Z] %d %d:%d:%d GMT",
229	&tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
230	&tm_sec) == 6 &&
231	scan_mon( str_mon, &tm_mon ) )
232	{
233	tm.tm_mday = tm_mday;
234	tm.tm_mon = tm_mon;
235	tm.tm_year = tm_year;
236	tm.tm_hour = tm_hour;
237	tm.tm_min = tm_min;
238	tm.tm_sec = tm_sec;
239	}
240
241	/* HH:MM:SS GMT DD-mth-YY */
242	else if ( sscanf( cp, "%d:%d:%d GMT %d-%400[a-zA-Z]-%d",
243	&tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,
244	&tm_year ) == 6 &&
245	scan_mon( str_mon, &tm_mon ) )
246	{
247	tm.tm_hour = tm_hour;
248	tm.tm_min = tm_min;
249	tm.tm_sec = tm_sec;
250	tm.tm_mday = tm_mday;
251	tm.tm_mon = tm_mon;
252	tm.tm_year = tm_year;
253	}
254
255	/* HH:MM:SS GMT DD mth YY */
256	else if ( sscanf( cp, "%d:%d:%d GMT %d %400[a-zA-Z] %d",
257	&tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,
258	&tm_year ) == 6 &&
259	scan_mon( str_mon, &tm_mon ) )
260	{
261	tm.tm_hour = tm_hour;
262	tm.tm_min = tm_min;
263	tm.tm_sec = tm_sec;
264	tm.tm_mday = tm_mday;
265	tm.tm_mon = tm_mon;
266	tm.tm_year = tm_year;
267	}
268
269	/* wdy, DD-mth-YY HH:MM:SS GMT */
270	else if ( sscanf( cp, "%400[a-zA-Z], %d-%400[a-zA-Z]-%d %d:%d:%d GMT",
271	str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
272	&tm_sec ) == 7 &&
273	scan_wday( str_wday, &tm_wday ) &&
274	scan_mon( str_mon, &tm_mon ) )
275	{
276	tm.tm_wday = tm_wday;
277	tm.tm_mday = tm_mday;
278	tm.tm_mon = tm_mon;
279	tm.tm_year = tm_year;
280	tm.tm_hour = tm_hour;
281	tm.tm_min = tm_min;
282	tm.tm_sec = tm_sec;
283	}
284
285	/* wdy, DD mth YY HH:MM:SS GMT */
286	else if ( sscanf( cp, "%400[a-zA-Z], %d %400[a-zA-Z] %d %d:%d:%d GMT",
287	str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
288	&tm_sec ) == 7 &&
289	scan_wday( str_wday, &tm_wday ) &&
290	scan_mon( str_mon, &tm_mon ) )
291	{
292	tm.tm_wday = tm_wday;
293	tm.tm_mday = tm_mday;
294	tm.tm_mon = tm_mon;
295	tm.tm_year = tm_year;
296	tm.tm_hour = tm_hour;
297	tm.tm_min = tm_min;
298	tm.tm_sec = tm_sec;
299	}
300
301	/* wdy mth DD HH:MM:SS GMT YY */
302	else if ( sscanf( cp, "%400[a-zA-Z] %400[a-zA-Z] %d %d:%d:%d GMT %d",
303	str_wday, str_mon, &tm_mday, &tm_hour, &tm_min, &tm_sec,
304	&tm_year ) == 7 &&
305	scan_wday( str_wday, &tm_wday ) &&
306	scan_mon( str_mon, &tm_mon ) )
307	{
308	tm.tm_wday = tm_wday;
309	tm.tm_mon = tm_mon;
310	tm.tm_mday = tm_mday;
311	tm.tm_hour = tm_hour;
312	tm.tm_min = tm_min;
313	tm.tm_sec = tm_sec;
314	tm.tm_year = tm_year;
315	}
316	else
317	return (time_t) -1;
318
319	if ( tm.tm_year > 1900 )
320	tm.tm_year -= 1900;
321	else if ( tm.tm_year < 70 )
322	tm.tm_year += 100;
323
324	t = tm_to_time( &tm );
325
326	return t;
327	}