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#include <u.h>
#include <libc.h>
#include <httpd.h>
/*
* print dates in the format
* Wkd, DD Mon YYYY HH:MM:SS GMT
* parse dates of formats
* Wkd, DD Mon YYYY HH:MM:SS GMT
* Weekday, DD-Mon-YY HH:MM:SS GMT
* Wkd Mon ( D|DD) HH:MM:SS YYYY
* plus anything similar
*/
static char *
weekdayname[7] =
{
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
static char *
wdayname[7] =
{
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static char *
monname[12] =
{
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static int dateindex(char*, char**, int);
static int
dtolower(int c)
{
if(c >= 'A' && c <= 'Z')
return c - 'A' + 'a';
return c;
}
static int
disalpha(int c)
{
return c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z';
}
static int
disdig(int c)
{
return c >= '0' && c <= '9';
}
int
hdatefmt(Fmt *f)
{
Tm *tm;
ulong t;
t = va_arg(f->args, ulong);
tm = gmtime(t);
return fmtprint(f, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
wdayname[tm->wday], tm->mday, monname[tm->mon], tm->year+1900,
tm->hour, tm->min, tm->sec);
}
static char*
dateword(char *date, char *buf)
{
char *p;
int c;
p = buf;
while(!disalpha(c = *date) && !disdig(c) && c)
date++;
while(disalpha(c = *date)){
if(p - buf < 30)
*p++ = dtolower(c);
date++;
}
*p = 0;
return date;
}
static int
datenum(char **d)
{
char *date;
int c, n;
date = *d;
while(!disdig(c = *date) && c)
date++;
if(c == 0){
*d = date;
return -1;
}
n = 0;
while(disdig(c = *date)){
n = n * 10 + c - '0';
date++;
}
*d = date;
return n;
}
/*
* parse a date and return the seconds since the epoch
* return 0 for a failure
*/
ulong
hdate2sec(char *date)
{
Tm tm;
char buf[32];
/*
* Weekday|Wday
*/
date = dateword(date, buf);
tm.wday = dateindex(buf, wdayname, 7);
if(tm.wday < 0)
tm.wday = dateindex(buf, weekdayname, 7);
if(tm.wday < 0)
return 0;
/*
* check for the two major formats
*/
date = dateword(date, buf);
tm.mon = dateindex(buf, monname, 12);
if(tm.mon >= 0){
/*
* MM
*/
tm.mday = datenum(&date);
if(tm.mday < 1 || tm.mday > 31)
return 0;
/*
* HH:MM:SS
*/
tm.hour = datenum(&date);
if(tm.hour < 0 || tm.hour >= 24)
return 0;
tm.min = datenum(&date);
if(tm.min < 0 || tm.min >= 60)
return 0;
tm.sec = datenum(&date);
if(tm.sec < 0 || tm.sec >= 60)
return 0;
/*
* YYYY
*/
tm.year = datenum(&date);
if(tm.year < 70 || tm.year > 99 && tm.year < 1970)
return 0;
if(tm.year >= 1970)
tm.year -= 1900;
}else{
/*
* MM-Mon-(YY|YYYY)
*/
tm.mday = datenum(&date);
if(tm.mday < 1 || tm.mday > 31)
return 0;
date = dateword(date, buf);
tm.mon = dateindex(buf, monname, 12);
if(tm.mon < 0 || tm.mon >= 12)
return 0;
tm.year = datenum(&date);
if(tm.year < 70 || tm.year > 99 && tm.year < 1970)
return 0;
if(tm.year >= 1970)
tm.year -= 1900;
/*
* HH:MM:SS
*/
tm.hour = datenum(&date);
if(tm.hour < 0 || tm.hour >= 24)
return 0;
tm.min = datenum(&date);
if(tm.min < 0 || tm.min >= 60)
return 0;
tm.sec = datenum(&date);
if(tm.sec < 0 || tm.sec >= 60)
return 0;
/*
* timezone
*/
dateword(date, buf);
if(strncmp(buf, "gmt", 3) != 0)
return 0;
}
strcpy(tm.zone, "GMT");
tm.tzoff = 0;
tm.yday = 0;
return tm2sec(&tm);
}
static int
dateindex(char *d, char **tab, int n)
{
int i;
for(i = 0; i < n; i++)
if(cistrcmp(d, tab[i]) == 0)
return i;
return -1;
}
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