Subversion Repositories planix.SVN

Rev

Rev 2 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
#include <u.h>
2 
#include <libc.h>
3 
#include <httpd.h>
4 
 
5 
/*
6 
 * print dates in the format
7 
 * Wkd, DD Mon YYYY HH:MM:SS GMT
8 
 * parse dates of formats
9 
 * Wkd, DD Mon YYYY HH:MM:SS GMT
10 
 * Weekday, DD-Mon-YY HH:MM:SS GMT
11 
 * Wkd Mon ( D|DD) HH:MM:SS YYYY
12 
 * plus anything similar
13 
 */
14 
static char *
15 
weekdayname[7] =
16 
{
17 
	"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
18 
};
19 
static char *
20 
wdayname[7] =
21 
{
22 
	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
23 
};
24 
 
25 
static char *
26 
monname[12] =
27 
{
28 
	"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
29 
};
30 
 
31 
static	int	dateindex(char*, char**, int);
32 
 
33 
static int
34 
dtolower(int c)
35 
{
36 
	if(c >= 'A' && c <= 'Z')
37 
		return c - 'A' + 'a';
38 
	return c;
39 
}
40 
 
41 
static int
42 
disalpha(int c)
43 
{
44 
	return c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z';
45 
}
46 
 
47 
static int
48 
disdig(int c)
49 
{
50 
	return c >= '0' && c <= '9';
51 
}
52 
 
53 
int
54 
hdatefmt(Fmt *f)
55 
{
56 
	Tm *tm;
57 
	ulong t;
58 
 
59 
	t = va_arg(f->args, ulong);
60 
	tm = gmtime(t);
61 
	return fmtprint(f, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
62 
		wdayname[tm->wday], tm->mday, monname[tm->mon], tm->year+1900,
63 
		tm->hour, tm->min, tm->sec);
64 
}
65 
 
66 
static char*
67 
dateword(char *date, char *buf)
68 
{
69 
	char *p;
70 
	int c;
71 
 
72 
	p = buf;
73 
	while(!disalpha(c = *date) && !disdig(c) && c)
74 
		date++;
75 
	while(disalpha(c = *date)){
76 
		if(p - buf < 30)
77 
			*p++ = dtolower(c);
78 
		date++;
79 
	}
80 
	*p = 0;
81 
	return date;
82 
}
83 
 
84 
static int
85 
datenum(char **d)
86 
{
87 
	char *date;
88 
	int c, n;
89 
 
90 
	date = *d;
91 
	while(!disdig(c = *date) && c)
92 
		date++;
93 
	if(c == 0){
94 
		*d = date;
95 
		return -1;
96 
	}
97 
	n = 0;
98 
	while(disdig(c = *date)){
99 
		n = n * 10 + c - '0';
100 
		date++;
101 
	}
102 
	*d = date;
103 
	return n;
104 
}
105 
 
106 
/*
107 
 * parse a date and return the seconds since the epoch
108 
 * return 0 for a failure
109 
 */
110 
ulong
111 
hdate2sec(char *date)
112 
{
113 
	Tm tm;
114 
	char buf[32];
115 
 
116 
	/*
117 
	 * Weekday|Wday
118 
	 */
119 
	date = dateword(date, buf);
120 
	tm.wday = dateindex(buf, wdayname, 7);
121 
	if(tm.wday < 0)
122 
		tm.wday = dateindex(buf, weekdayname, 7);
123 
	if(tm.wday < 0)
124 
		return 0;
125 
 
126 
	/*
127 
	 * check for the two major formats
128 
	 */
129 
	date = dateword(date, buf);
130 
	tm.mon = dateindex(buf, monname, 12);
131 
	if(tm.mon >= 0){
132 
		/*
133 
		 * MM
134 
		 */
135 
		tm.mday = datenum(&date);
136 
		if(tm.mday < 1 || tm.mday > 31)
137 
			return 0;
138 
 
139 
		/*
140 
		 * HH:MM:SS
141 
		 */
142 
		tm.hour = datenum(&date);
143 
		if(tm.hour < 0 || tm.hour >= 24)
144 
			return 0;
145 
		tm.min = datenum(&date);
146 
		if(tm.min < 0 || tm.min >= 60)
147 
			return 0;
148 
		tm.sec = datenum(&date);
149 
		if(tm.sec < 0 || tm.sec >= 60)
150 
			return 0;
151 
 
152 
		/*
153 
		 * YYYY
154 
		 */
155 
		tm.year = datenum(&date);
156 
		if(tm.year < 70 || tm.year > 99 && tm.year < 1970)
157 
			return 0;
158 
		if(tm.year >= 1970)
159 
			tm.year -= 1900;
160 
	}else{
161 
		/*
162 
		 * MM-Mon-(YY|YYYY)
163 
		 */
164 
		tm.mday = datenum(&date);
165 
		if(tm.mday < 1 || tm.mday > 31)
166 
			return 0;
167 
		date = dateword(date, buf);
168 
		tm.mon = dateindex(buf, monname, 12);
169 
		if(tm.mon < 0 || tm.mon >= 12)
170 
			return 0;
171 
		tm.year = datenum(&date);
172 
		if(tm.year < 70 || tm.year > 99 && tm.year < 1970)
173 
			return 0;
174 
		if(tm.year >= 1970)
175 
			tm.year -= 1900;
176 
 
177 
		/*
178 
		 * HH:MM:SS
179 
		 */
180 
		tm.hour = datenum(&date);
181 
		if(tm.hour < 0 || tm.hour >= 24)
182 
			return 0;
183 
		tm.min = datenum(&date);
184 
		if(tm.min < 0 || tm.min >= 60)
185 
			return 0;
186 
		tm.sec = datenum(&date);
187 
		if(tm.sec < 0 || tm.sec >= 60)
188 
			return 0;
189 
 
190 
		/*
191 
		 * timezone
192 
		 */
193 
		dateword(date, buf);
194 
		if(strncmp(buf, "gmt", 3) != 0)
195 
			return 0;
196 
	}
197 
 
198 
	strcpy(tm.zone, "GMT");
199 
	tm.tzoff = 0;
200 
	tm.yday = 0;
201 
	return tm2sec(&tm);
202 
}
203 
 
204 
static int
205 
dateindex(char *d, char **tab, int n)
206 
{
207 
	int i;
208 
 
209 
	for(i = 0; i < n; i++)
210 
		if(cistrcmp(d, tab[i]) == 0)
211 
			return i;
212 
	return -1;
213 
}