File: mail_header.c

package info (click to toggle)
xfaces 3.3-29
  • links: PTS
  • area: main
  • in suites: bullseye, buster, sid, stretch
  • size: 948 kB
  • ctags: 1,414
  • sloc: ansic: 7,487; makefile: 948; sh: 5
file content (459 lines) | stat: -rw-r--r-- 8,611 bytes parent folder | download | duplicates (7)
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
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
/*                             -*- Mode: C++-C -*- 
 * 
 *		 Copyright 1994 Christopher B. Liebman
 *
 *     Permission to use, copy, modify, distribute, and sell this software
 *     and its documentation for any purpose is hereby granted without fee,
 *     provided that the above copyright notice appear in all copies and that
 *     both that copyright notice and this permission notice appear in
 *     supporting documentation, and that the name Christopher B. Liebman not
 *     be used in advertising or publicity pertaining to distribution of this
 *     software without specific, written prior permission.
 *
 *    THIS SOFTWARE IS PROVIDED `AS-IS'.  CHRISTOPHER B. LIEBMAN, DISCLAIMS
 *    ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT
 *    LIMITATION ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 *    PARTICULAR PURPOSE, OR NONINFRINGEMENT.  IN NO EVENT SHALL CHRISTOPHER
 *    B. LIEBMAN, BE LIABLE FOR ANY DAMAGES WHATSOEVER, INCLUDING SPECIAL,
 *    INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF USE, DATA, OR
 *    PROFITS, EVEN IF ADVISED OF THE POSSIBILITY THEREOF, AND REGARDLESS OF
 *    WHETHER IN AN ACTION IN CONTRACT, TORT OR NEGLIGENCE, ARISING OUT OF
 *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Author          : Chris Liebman
 * Created On      : Tue Jan 11 14:11:30 1994
 * Last Modified By: Chris Liebman
 * Last Modified On: Sun Feb 20 13:01:44 1994
 * Update Count    : 38
 * Status          : Released
 * 
 * HISTORY
 * 
 * PURPOSE
 * 	Routines to handle mail headers.
*/

#ifndef lint
static char *RCSid = "$Id: mail_header.c,v 1.2 1994/02/23 13:17:02 liebman Exp $";
#endif

#include "faces.h"

#define	BUFFER_SIZE	80
#define	BUFFER_SIZE_INC	80

static char*	buffer = NULL;
static int	buffer_size = 0;

/*
 *   Read a mail header line from given file.  Handle line continuations.
 * If the first char is a newln then there are no more headers.
*/

char*
MailHeaderLineRead()
{
    int		ch;
    int		string_length = 0;
    int		get_more;
    char*	str;
    
    /*
     *  Look at the first char.  If it is a newln then there are no more
     * headers and the newln is pushed back.  Also return NULL if end of
     * file.
    */
    
    ch = MailFileReadChar();
    
    if (ch == EOF)
    {
	return NULL;
    }
    
    if (ch == '\n')
    {
	MailFileUnReadChar(ch);
	return NULL;
    }
    
    /*
     * If the buffer has not beed created yet then create it.
    */
    
    if (buffer_size == 0)
    {
	buffer = XtMalloc(BUFFER_SIZE);
	buffer_size = BUFFER_SIZE;
    }
    
    /*
     * Ok, start collecting characters.
    */
    
    do
    {
	get_more = 0;
	
	while((ch != '\n') && (ch != EOF))
	{
	    if (string_length >= buffer_size)
	    {
		/*
		 * Grow buffer.
		*/
		
		buffer = XtRealloc(buffer, buffer_size + BUFFER_SIZE_INC);
		buffer_size += BUFFER_SIZE_INC;
	    }
	    
	    buffer[string_length++] = ch;
	    
	    ch = MailFileReadChar();
	}
	
	/*
	 * Ok, We have gotten to the end of a line.  If the first character
	 * on the next line is a tab then it is a continuation of this
	 * line and we need to skip the tab and continue reading chars.
	*/
	
	if (ch != EOF)
	{
	    /*
	     * Get the next character, and if it is a TAB then we continue
	     * the loop.
	    */
	    
	    ch = MailFileReadChar();
	    if ((ch == '\t') || (ch == ' '))
	    {
		get_more = 1;
	    }
	    else
	    {
		/*
		 * Not a line continuation, put back.
		*/
		
		MailFileUnReadChar(ch);
	    }
	}
    } while (get_more);
    
    /*
     * Terminate the string.
    */
    
    buffer[string_length] = '\0';
    
    /*
     *  Allocate a buffer that we can return.
    */

    str = XtMalloc(string_length + 1);
    strcpy(str, buffer);
    
    return (str);
}

/*
 * Read a header line and create a header struct.
*/

MailHeader*
MailHeaderRead()
{
    MailHeader*	header;
    char*	line;
    char*	p;
    int		len;
    
    /*
     *   First read a line.
    */
    
    line = MailHeaderLineRead();
    
    /*
     *  No line means no more headers.
    */
    
    if (!line)
    {
	return NULL;
    }
    
#ifdef DEBUG
    fprintf(stderr, "read header: <%s>\n", line);
#endif
    
    /*
     *  Allocate the header.
    */
    
    header = (MailHeader*) XtMalloc(sizeof(MailHeader));
    header->name  = NULL;
    header->value = NULL;
    header->line  = NULL;
    header->next  = NULL;
    header->prev  = NULL;
    
    /*
     *   Now locate the try to parse out the line.  First skip to the:
     * at the end of this header name (note that we accept a ':' *or*
     * a ` ` as the terminator.
    */
    
    for (p = line; *p && *p != ':' && *p != ' '; ++p);
    
    if (!*p)
    {
	/*
	 * Bogus header!  We failed to parse it.
	*/
	
	header->line = line;
#ifdef DEBUG
	fprintf(stderr, "bogus header: <%s>\n", line);
#endif
	return header;
    }
    
    ++p;
    
    /*
     *  Allocate the name and value.
    */
    
    len = p - line;
    header->name = XtMalloc(len + 1);
    strncpy(header->name, line, len);
    header->name[len] = '\0';
    
    header->value = XtMalloc(strlen(p)+1);
    strcpy(header->value, p);
    
    XtFree(line);
    
#ifdef DEBUG
    fprintf(stderr, "parsed header: <%s> <%s>\n", header->name, header->value);
#endif    
    return header;
}

/*
 *   Read in all of the mail headers for a mail messages.
*/

MailHeader*
MailHeaderListRead()
{
    MailHeader	*header_head = NULL;
    MailHeader	*header_tail = NULL;
    MailHeader	*header;
    
#ifdef DEBUG
    fprintf(stderr, "reading mail headers...\n");
#endif
    
    while((header = MailHeaderRead()) != NULL)
    {
	/*
	 * We go in the list at the end so there is no next guy.
	*/
	
	header->next = NULL;
	
	/*
	 *  The last guy on the list is our prev.
	*/
	
	header->prev = header_tail;
	
	/*
	 *   If there is a prev guy ne are its next.
	*/
	
	if (header->prev != NULL)
	{
	    header->prev->next = header;
	}
	
	/*
	 *  If there is no head, we are it. This is the
	 * first header.
	*/
	
	if (header_head == NULL)
	{
	    header_head = header;
	}
	
	/*
	 *   We are the tail.
	*/
	
	header_tail = header;
    }

    return header_head;
}

void
MailHeaderFree(header)
MailHeader* header;
{
    if (header->name != NULL)
    {
	XtFree(header->name);
    }

    if (header->value != NULL)
    {
	XtFree(header->value);
    }

    if (header->line)
    {
	XtFree(header->line);
    }
    
    XtFree((void *)header);
}

void
MailHeaderListFree(list)
MailHeader*	list;
{
    MailHeader*	header;
    
    while(list != NULL)
    {
	header = list;
	list = list->next;
	MailHeaderFree(header);
    }
}

#define	MKLOWER(c)	isupper(c) ? tolower(c) : c

static int
HeaderNameCompare(s1, s2)
char*	s1;
char*	s2;
{
    int	c1, c2;
    
    while ((*s1 != '\0') &&
	   (*s2 != '\0'))
    {
	c1 = isupper(*s1) ? tolower(*s1) : *s1;
	c2 = isupper(*s2) ? tolower(*s2) : *s2;
	
	if (c1 != c2)
	{
	    break;
	}
	
	++s1;
	++s2;
    }
    
    return *s1 - *s2;
}


/*
 * Locate the named header in the header list.
*/

MailHeader*
MailHeaderFind(name, list)
char*		name;
MailHeader*	list;
{
    MailHeader	*header;
    
    for(header = list; header != NULL; header = header->next)
    {
	if (header->name != NULL && HeaderNameCompare(name, header->name) == 0)
	{
	    return header;
	}
    }
    
    return NULL;
}

/*
 * Compare two mail header lists.
*/

int
MailHeaderListCompare(list1, list2)
MailHeader*	list1;
MailHeader*	list2;
{
    MailHeader* header1;
    MailHeader*	header2;

    for(header1 = list1, header2 = list2;
	header1 != NULL && header2 != NULL;
	header1 = header1->next, header2 = header2->next)
    {
	int	name1, name2;
	int	value1, value2;
	int	line1, line2;
	
	name1 = (header1->name != NULL);
	name2 = (header2->name != NULL);
	value1 = (header1->value != NULL);
	value2 = (header2->value != NULL);
	line1 = (header1->line != NULL);
	line2 = (header2->line != NULL);

	/*
	 *   Messages must both have or not have names/values/lines.
	*/

	if ((name1  != name2)  ||
	    (value1 != value2) ||
	    (line1  != line2))
	{
	    break;
	}
	
	if (name1  && (strcmp(header1->name,  header2->name)  != 0))
	{
	    break;
	}
	
	if (value1 && (strcmp(header1->value, header2->value) != 0))
	{
	    break;
	}
	
	if (line1 &&  (strcmp(header1->line,  header2->line)  != 0))
	{
	    break;
	}
    }
    
    /*
     * If we got thru all of the headers and both lists are exausted then
     * the header lists are identicle.
    */
    
    if (header1 == NULL && header2 == NULL)
    {
	return 1;
    }
    
    /*
     *   Header lists are different.
    */
    
    return 0;
}