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14c29200 » Antonio Radici
2009-05-24 Imported Upstream version 1.5.18
1 /*
2 * Copyright (C) 1996-2000 Michael R. Elkins <me@mutt.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19 #if HAVE_CONFIG_H
20 # include "config.h"
21 #endif
22
23 #include "mutt.h"
24
25 #include <ctype.h>
26 #include <string.h>
27
28 static const char *next_word (const char *s)
29 {
30 while (*s && !ISSPACE (*s))
31 s++;
32 SKIPWS (s);
33 return s;
34 }
35
36 int mutt_check_month (const char *s)
37 {
38 int i;
39
40 for (i = 0; i < 12; i++)
41 if (mutt_strncasecmp (s, Months[i], 3) == 0)
42 return (i);
43 return (-1); /* error */
44 }
45
46 static int is_day_name (const char *s)
47 {
48 int i;
49
50 if ((strlen (s) < 3) || !*(s + 3) || !ISSPACE (*(s+3)))
51 return 0;
52 for (i=0; i<7; i++)
53 if (mutt_strncasecmp (s, Weekdays[i], 3) == 0)
54 return 1;
55 return 0;
56 }
57
58 /*
59 * A valid message separator looks like:
60 *
61 * From [ <return-path> ] <weekday> <month> <day> <time> [ <timezone> ] <year>
62 */
63
64 int is_from (const char *s, char *path, size_t pathlen, time_t *tp)
65 {
66 struct tm tm;
67 int yr;
68
69 if (path)
70 *path = 0;
71
72 if (mutt_strncmp ("From ", s, 5) != 0)
73 return 0;
74
75 s = next_word (s); /* skip over the From part. */
76 if (!*s)
77 return 0;
78
79 dprint (3, (debugfile, "\nis_from(): parsing: %s", s));
80
81 if (!is_day_name (s))
82 {
83 const char *p;
84 size_t len;
85 short q = 0;
86
87 for (p = s; *p && (q || !ISSPACE (*p)); p++)
88 {
89 if (*p == '\\')
90 {
91 if (*++p == '\0')
92 return 0;
93 }
94 else if (*p == '"')
95 {
96 q = !q;
97 }
98 }
99
100 if (q || !*p) return 0;
101
102 if (path)
103 {
104 len = (size_t) (p - s);
105 if (len + 1 > pathlen)
106 len = pathlen - 1;
107 memcpy (path, s, len);
108 path[len] = 0;
109 dprint (3, (debugfile, "is_from(): got return path: %s\n", path));
110 }
111
112 s = p + 1;
113 SKIPWS (s);
114 if (!*s)
115 return 0;
116
117 if (!is_day_name (s))
118 {
119 dprint(1, (debugfile, "is_from(): expected weekday, got: %s\n", s));
120 return 0;
121 }
122 }
123
124 s = next_word (s);
125 if (!*s) return 0;
126
127 /* do a quick check to make sure that this isn't really the day of the week.
128 * this could happen when receiving mail from a local user whose login name
129 * is the same as a three-letter abbreviation of the day of the week.
130 */
131 if (is_day_name (s))
132 {
133 s = next_word (s);
134 if (!*s) return 0;
135 }
136
137 /* now we should be on the month. */
138 if ((tm.tm_mon = mutt_check_month (s)) < 0) return 0;
139
140 /* day */
141 s = next_word (s);
142 if (!*s) return 0;
143 if (sscanf (s, "%d", &tm.tm_mday) != 1) return 0;
144
145 /* time */
146 s = next_word (s);
147 if (!*s) return 0;
148
149 /* Accept either HH:MM or HH:MM:SS */
150 if (sscanf (s, "%d:%d:%d", &tm.tm_hour, &tm.tm_min, &tm.tm_sec) == 3);
151 else if (sscanf (s, "%d:%d", &tm.tm_hour, &tm.tm_min) == 2)
152 tm.tm_sec = 0;
153 else
154 return 0;
155
156 s = next_word (s);
157 if (!*s) return 0;
158
159 /* timezone? */
160 if (isalpha ((unsigned char) *s) || *s == '+' || *s == '-')
161 {
162 s = next_word (s);
163 if (!*s) return 0;
164
165 /*
166 * some places have two timezone fields after the time, e.g.
167 * From xxxx@yyyyyyy.fr Wed Aug 2 00:39:12 MET DST 1995
168 */
169 if (isalpha ((unsigned char) *s))
170 {
171 s = next_word (s);
172 if (!*s) return 0;
173 }
174 }
175
176 /* year */
177 if (sscanf (s, "%d", &yr) != 1) return 0;
178 tm.tm_year = yr > 1900 ? yr - 1900 : (yr < 70 ? yr + 100 : yr);
179
180 dprint (3,(debugfile, "is_from(): month=%d, day=%d, hr=%d, min=%d, sec=%d, yr=%d.\n",
181 tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year));
182
183 tm.tm_isdst = -1;
184
185 if (tp) *tp = mutt_mktime (&tm, 0);
186 return 1;
187 }
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