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
|
#include "parse.h"
#include <errno.h>
#include <string.h>
#include "macro.h"
#include "vcal.h"
#include "err.h"
int parse_file(char* fname, FILE* f, vcalendar* cal) {
int segments = 1;
SNEW(strbuf, str, segments * SEGSIZE);
part_context p_ctx = p_key;
SNEW(strbuf, skip, SEGSIZE);
parse_ctx ctx = {
.scope = s_none,
.skip_to = &skip
};
int keylen = 100;
int vallen = 100;
int line = 0;
vevent* ev = NULL;
SNEW(content_line, cline, keylen, vallen);
char c;
while ( (c = fgetc(f)) != EOF) {
/*
* A carrige return means that the current line is at an
* end. The following character should always be \n.
* However, if the first character on the next line is a
* whitespace then the two lines should be concatenated.
*
* NOTE
* The above is true according to the standard. But I have
* found files with only NL. The code below ends line on the
* first of NL or CR, and then ensures that the program thinks
* it got the expected CRNL.
*/
if (c == '\r' || c == '\n') {
char s[2];
s[0] = (c == '\n' ? '\n' : fgetc(f));
s[1] = fgetc(f);
if (s[0] != '\n') { ERR_F("%s, %i", "expected newline after CR", line); }
else if (s[1] == ' ' || s[1] == '\t') {
/* Folded line, increase size of key and continue. */
/* TODO segments is always incremented here, meaning
* that segment grows larger for every multi line
* encountered.
*/
if (strbuf_realloc(&str, ++segments * SEGSIZE) != 0) {
ERR_F("%s, %i", "Failed to realloc strbuf", line);
exit (1);
}
continue;
} else {
/* Actuall end of line, handle values. */
/* Push back the last written character to the stream,
* since it's part of the next line.
*/
if (ungetc(s[1], f) != s[1]) {
ERR_F("%s, %i", "Failed to put character back on FILE", line);
exit (2);
}
if (str.ptr + 1 > vallen) {
vallen = str.ptr + 1;
strbuf_realloc(cline.vals.cur->value, vallen);
}
strbuf_copy(cline.vals.cur->value, &str);
/* TODO when do I actualy cap? */
// strbuf_cap(cline.vals.cur->value);
++line;
switch (handle_kv(cal, ev, &cline, line, &ctx)) {
case s_event:
RENEW(vevent, ev, fname);
break;
}
strbuf_soft_reset(&str);
p_ctx = p_key;
continue;
}
/*
* TODO context for property_{key,val}.
*/
} else if (p_ctx == p_key && c == ':') {
if (str.ptr + 1 > keylen) {
keylen = str.ptr + 1;
/*
* Allow for key's longer than 100 octets. It
* currently is of no use, since key's can't be
* folded.
* TODO check if everything should be unfolded at 75
* octets, or if that is only for values.
*
* TODO earlier there was a bug here. Test if that is
* fixed and reenable this line.
*/
// strbuf_realloc(&cline.key, keylen);
}
strbuf_copy(&cline.key, &str);
strbuf_cap(&cline.key);
strbuf_soft_reset(&str);
p_ctx = p_value;
continue;
}
strbuf_append(&str, c);
}
if (! feof(f)) {
ERR("Error parsing");
} else if (cline.vals.cur->value->len != 0 && str.ptr != 0) {
/*
* The standard (3.4, l. 2675) says that each icalobject must
* end with CRLF. My files however does not, so we also parse
* the end here.
*/
if (str.ptr + 1 > vallen) {
vallen = str.ptr + 1;
strbuf_realloc(cline.vals.cur->value, vallen);
}
strbuf_copy(cline.vals.cur->value, &str);
strbuf_cap(cline.vals.cur->value);
handle_kv(cal, ev, &cline, line, &ctx);
}
FREE(strbuf)(&str);
FREE(content_line)(&cline);
FREE(strbuf)(ctx.skip_to);
return 0;
}
/*
* TODO Extend this to handle properties
*/
int handle_kv(
vcalendar* cal,
vevent* ev,
content_line* cline,
int line,
parse_ctx* ctx
) {
switch (ctx->scope) {
case s_skip:
if (strbuf_c(&cline->key, "END") && strbuf_cmp(cline->vals.cur->value, ctx->skip_to)) {
ctx->scope = s_calendar;
}
break;
case s_none:
if (! (strbuf_c(&cline->key, "BEGIN") && strbuf_c(cline->vals.cur->value, "VCALENDAR"))) {
ERR_F("%s, %i\n%s", "Invalid start of calendar", line, ev->filename);
return -1;
}
ctx->scope = s_calendar;
break;
case s_calendar:
if (strbuf_c(&cline->key, "BEGIN")) {
if (strbuf_c(cline->vals.cur->value, "VEVENT")) {
ctx->scope = s_event;
return ctx->scope;
break;
} else {
/*
* Here we found the start of some form of block
* we don't understand. Just skip everything until
* we find the matching END
*/
ctx->scope = s_skip;
strbuf_copy(ctx->skip_to, cline->vals.cur->value);
}
} else if (strbuf_c(&cline->key, "END")) {
if (strbuf_c(cline->vals.cur->value, "VCALENDAR")) {
ctx->scope = s_none;
break;
}
}
break;
case s_event:
if (ev == NULL) {
ERR_F("%s, %i", "Something has gone terribly wrong", line);
return -5;
}
if (strbuf_c(&cline->key, "END")) {
if (strbuf_c(cline->vals.cur->value, "VEVENT")) {
push_event(cal, ev);
ctx->scope = s_calendar;
return ctx->scope;
} else {
ERR_F("%s, %i", "Trying to end something, expected VEVENT", line);
return -3;
}
} else {
NEW(content_line, c);
content_line_copy(c, cline);
PUSH(TRIE(content_line))(&ev->clines, c->key.mem, c);
}
break;
}
return 0;
}
|
