File: httptime.c

package info (click to toggle)
aolserver4 4.5.1-18.1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 12,008 kB
  • sloc: ansic: 45,126; tcl: 5,533; sh: 1,037; makefile: 380; pascal: 219; php: 13
file content (398 lines) | stat: -rw-r--r-- 9,228 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
/*
 * The contents of this file are subject to the AOLserver Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://aolserver.com/.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is AOLserver Code and related documentation
 * distributed by AOL.
 * 
 * The Initial Developer of the Original Code is America Online,
 * Inc. Portions created by AOL are Copyright (C) 1999 America Online,
 * Inc. All Rights Reserved.
 *
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU General Public License (the "GPL"), in which case the
 * provisions of GPL are applicable instead of those above.  If you wish
 * to allow use of your version of this file only under the terms of the
 * GPL and not to allow others to use your version of this file under the
 * License, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the GPL.
 * If you do not delete the provisions above, a recipient may use your
 * version of this file under either the License or the GPL.
 */

static char *weekdays_names[7] =
{ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };


/* 
 * time.c --
 *
 *	Manipulate times and dates; this is strongly influenced
 *	by HTSUtils.c from CERN. See also RFC 1123.
 */

static const char *RCSID = "@(#) $Header: /cvsroot/aolserver/aolserver/nsd/httptime.c,v 1.9 2003/01/18 19:24:20 jgdavidson Exp $, compiled: " __DATE__ " " __TIME__;

#include "nsd.h"

/*
 * Local functions defined in this file
 */

static int MakeNum(char *s);
static int MakeMonth(char *s);

/*
 * Static variables defined in this file
 */

static char *month_names[12] =
{
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};


/*
 *----------------------------------------------------------------------
 *
 * Ns_Httptime --
 *
 *	Convert a time_t into a time/date format used in HTTP
 *	(see RFC 1123). If passed-in time is null, then the
 *	current time will be used.
 *
 * Results:
 *	The string time, or NULL if error. 
 *
 * Side effects:
 *	None. 
 *
 *----------------------------------------------------------------------
 */

char *
Ns_HttpTime(Ns_DString *pds, time_t *when)
{
    time_t     now;
    char       buf[40];
    struct tm *tmPtr;

    if (when == NULL) {
        now = time(0);
        when = &now;
    }
    tmPtr = ns_gmtime(when);
    if (tmPtr == NULL) {
        return NULL;
    }

    /*
     * Using snprintf instead of strftime to always use english names
     * The format is RFC 1123: "Sun, 06 Nov 1997 09:12:45 GMT"
     */
    
    snprintf(buf, 40, "%s, %d %s %d %02d:%02d:%02d GMT",
    weekdays_names[tmPtr->tm_wday], tmPtr->tm_mday,
    month_names[tmPtr->tm_mon], tmPtr->tm_year + 1900,
    tmPtr->tm_hour, tmPtr->tm_min, tmPtr->tm_sec);

    Ns_DStringAppend(pds, buf);
    return pds->string;
}


/*
 *----------------------------------------------------------------------
 *
 * Ns_ParseHttpTime --
 *
 *	Take a time in one of three formats and convert it to a time_t. 
 *	Formats are: "Thursday, 10-Jun-93 01:29:59 GMT", "Thu, 10 
 *	Jan 1993 01:29:59 GMT", or "Wed Jun  9 01:29:59 1993 GMT"
 *
 * Results:
 *	0 if error, or standard time_t.
 *
 * Side effects:
 *	None. 
 *
 *----------------------------------------------------------------------
 */

time_t
Ns_ParseHttpTime(char *str)
{
    char      *s;
    struct tm  tm;
    time_t     t;

    if (str == NULL) {
        return 0;
    }

    /*
     * Find the comma after day-of-week
     *
     * Thursday, 10-Jun-93 01:29:59 GMT
     *         ^
     *         +-- s
     *
     * Thu, 10 Jan 1993 01:29:59 GMT
     *    ^
     *    +-- s
     */

    s = strchr(str, ',');
    if (s != NULL) {

	/*
	 * Advance S to the first non-space after the comma
	 * which should be the first digit of the day.
	 */
	
        s++;
        while (*s && *s == ' ') {
            s++;
	}

	/*
	 * Figure out which format it is in. If there is a hyphen, then
	 * it must be the first format.
	 */
	
        if (strchr(s, '-') != NULL) {
            if (strlen(s) < 18) {
                return 0;
            }

	    /*
	     * The format is:
	     *
	     * Thursday, 10-Jun-93 01:29:59 GMT
	     *           ^
	     *           +--s
	     */
	    
            tm.tm_mday = MakeNum(s);
            tm.tm_mon = MakeMonth(s + 3);
            tm.tm_year = MakeNum(s + 7);
            tm.tm_hour = MakeNum(s + 10);
            tm.tm_min = MakeNum(s + 13);
            tm.tm_sec = MakeNum(s + 16);
        } else {
            if ((int) strlen(s) < 20) {
                return 0;
            }

	    /*
	     * The format is:
	     *
	     * Thu, 10 Jan 1993 01:29:59 GMT
	     *      ^
	     *      +--s
	     */
	    
            tm.tm_mday = MakeNum(s);
            tm.tm_mon = MakeMonth(s + 3);
            tm.tm_year = (100 * MakeNum(s + 7) - 1900) + MakeNum(s + 9);
            tm.tm_hour = MakeNum(s + 12);
            tm.tm_min = MakeNum(s + 15);
            tm.tm_sec = MakeNum(s + 18);
        }
    } else {

	/*
	 * No commas, so it must be the third, fixed field, format:
	 *
	 * Wed Jun  9 01:29:59 1993 GMT
	 *
	 * Advance s to the first letter of the month.
	 */
	 
        s = str;
        while (*s && *s == ' ') {
            s++;
	}
        if ((int) strlen(s) < 24) {
            return 0;
        }
        tm.tm_mday = MakeNum(s + 8);
        tm.tm_mon = MakeMonth(s + 4);
        tm.tm_year = MakeNum(s + 22);
        tm.tm_hour = MakeNum(s + 11);
        tm.tm_min = MakeNum(s + 14);
        tm.tm_sec = MakeNum(s + 17);
    }

    /*
     * If there are any impossible values, then return an error.
     */
    
    if (tm.tm_sec < 0 || tm.tm_sec > 59 ||
        tm.tm_min < 0 || tm.tm_min > 59 ||
        tm.tm_hour < 0 || tm.tm_hour > 23 ||
        tm.tm_mday < 1 || tm.tm_mday > 31 ||
        tm.tm_mon < 0 || tm.tm_mon > 11 ||
        tm.tm_year < 70 || tm.tm_year > 120) {
        return 0;
    }
    tm.tm_isdst = 0;
#ifdef HAVE_TIMEGM
    t = timegm(&tm);
#else
    t = mktime(&tm) - timezone;
#endif
    return t;
}


/*
 *----------------------------------------------------------------------
 *
 * NsTclParseHttpTimeObjCmd --
 *
 *	Implements ns_parsehttptime as obj command. 
 *
 * Results:
 *	Tcl result. 
 *
 * Side effects:
 *	See docs. 
 *
 *----------------------------------------------------------------------
 */

int
NsTclParseHttpTimeObjCmd(ClientData arg, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])
{
    time_t time;

    if (objc != 2) {
        Tcl_WrongNumArgs(interp, 1, objv, "httptime");
        return TCL_ERROR;
    }
    time = Ns_ParseHttpTime(Tcl_GetString(objv[1]));
    if (time == 0) {
	Tcl_AppendResult(interp, "invalid time: ",
		Tcl_GetString(objv[1]), NULL);
	return TCL_ERROR;
    }
    Tcl_SetLongObj(Tcl_GetObjResult(interp), time);
    return TCL_OK;
}


/*
 *----------------------------------------------------------------------
 *
 * NsTclHttpTimeObjCmd --
 *
 *	Implements ns_httptime as obj command. 
 *
 * Results:
 *	Tcl result. 
 *
 * Side effects:
 *	See docs. 
 *
 *----------------------------------------------------------------------
 */

int
NsTclHttpTimeObjCmd(ClientData arg, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])
{
    Ns_DString ds;
    int        itime;
    time_t     time;

    if (objc != 2) {
        Tcl_WrongNumArgs(interp, 1, objv, "time");
        return TCL_ERROR;
    }
    if (Tcl_GetIntFromObj(interp, objv[1], &itime) != TCL_OK) {
        return TCL_ERROR;
    }
    time = (time_t) itime;
    Ns_DStringInit(&ds);
    Ns_HttpTime(&ds, &time);
    Tcl_SetResult(interp, Ns_DStringExport(&ds), (Tcl_FreeProc *) ns_free);
    Ns_DStringFree(&ds);
    return TCL_OK;
}


/*
 *----------------------------------------------------------------------
 *
 * MakeNum --
 *
 *	Convert a one or two-digit day into an integer, allowing a 
 *	space in the first position. 
 *
 * Results:
 *	An integer.
 *
 * Side effects:
 *	None. 
 *
 *----------------------------------------------------------------------
 */

static int
MakeNum(char *s)
{
    if (*s >= '0' && *s <= '9') {
        return (10 * (*s - '0')) + (*(s + 1) - '0');
    } else {
        return *(s + 1) - '0';
    }
}


/*
 *----------------------------------------------------------------------
 *
 * MakeMonth --
 *
 *	Convert a three-digit abbreviated month name into a number; 
 *	e.g., Jan=0, Feb=1, etc. 
 *
 * Results:
 *	An integral month number. 
 *
 * Side effects:
 *	None. 
 *
 *----------------------------------------------------------------------
 */

static int
MakeMonth(char *s)
{
    int i;

    /*
     * Make sure it's capitalized like this:
     * "Jan"
     */
     
    *s = toupper(*s);
    *(s + 1) = tolower(*(s + 1));
    *(s + 2) = tolower(*(s + 2));

    for (i = 0; i < 12; i++) {
        if (!strncmp(month_names[i], s, 3)) {
            return i;
	}
    }
    return 0;
}