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#include <u.h>
#include <libc.h>
#define TZSIZE 150
static void readtimezone(void);
static int rd_name(char**, char*);
static int rd_long(char**, long*);
static
struct
{
char stname[4];
char dlname[4];
long stdiff;
long dldiff;
long dlpairs[TZSIZE];
} timezone;
#define SEC2MIN 60L
#define SEC2HOUR (60L*SEC2MIN)
#define SEC2DAY (24L*SEC2HOUR)
/*
* days per month plus days/year
*/
static int dmsize[] =
{
365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static int ldmsize[] =
{
366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
/*
* return the days/month for the given year
*/
static int *
yrsize(int y)
{
if((y%4) == 0 && ((y%100) != 0 || (y%400) == 0))
return ldmsize;
else
return dmsize;
}
/*
* compute seconds since Jan 1 1970 GMT
* and convert to our timezone.
*/
long
tm2sec(Tm *tm)
{
long secs;
int i, yday, year, *d2m;
if(strcmp(tm->zone, "GMT") != 0 && timezone.stname[0] == 0)
readtimezone();
secs = 0;
/*
* seconds per year
*/
year = tm->year + 1900;
for(i = 1970; i < year; i++){
d2m = yrsize(i);
secs += d2m[0] * SEC2DAY;
}
/*
* if mday is set, use mon and mday to compute yday
*/
if(tm->mday){
yday = 0;
d2m = yrsize(year);
for(i=0; i<tm->mon; i++)
yday += d2m[i+1];
yday += tm->mday-1;
}else{
yday = tm->yday;
}
secs += yday * SEC2DAY;
/*
* hours, minutes, seconds
*/
secs += tm->hour * SEC2HOUR;
secs += tm->min * SEC2MIN;
secs += tm->sec;
/*
* Only handles zones mentioned in /env/timezone,
* but things get too ambiguous otherwise.
*/
if(strcmp(tm->zone, timezone.stname) == 0)
secs -= timezone.stdiff;
else if(strcmp(tm->zone, timezone.dlname) == 0)
secs -= timezone.dldiff;
if(secs < 0)
secs = 0;
return secs;
}
static
void
readtimezone(void)
{
char buf[TZSIZE*11+30], *p;
int i;
memset(buf, 0, sizeof(buf));
i = open("/env/timezone", 0);
if(i < 0)
goto error;
if(read(i, buf, sizeof(buf)) >= sizeof(buf))
goto error;
close(i);
p = buf;
if(rd_name(&p, timezone.stname))
goto error;
if(rd_long(&p, &timezone.stdiff))
goto error;
if(rd_name(&p, timezone.dlname))
goto error;
if(rd_long(&p, &timezone.dldiff))
goto error;
for(i=0; i<TZSIZE; i++) {
if(rd_long(&p, &timezone.dlpairs[i]))
goto error;
if(timezone.dlpairs[i] == 0)
return;
}
error:
timezone.stdiff = 0;
strcpy(timezone.stname, "GMT");
timezone.dlpairs[0] = 0;
}
static int
rd_name(char **f, char *p)
{
int c, i;
for(;;) {
c = *(*f)++;
if(c != ' ' && c != '\n')
break;
}
for(i=0; i<3; i++) {
if(c == ' ' || c == '\n')
return 1;
*p++ = c;
c = *(*f)++;
}
if(c != ' ' && c != '\n')
return 1;
*p = 0;
return 0;
}
static int
rd_long(char **f, long *p)
{
int c, s;
long l;
s = 0;
for(;;) {
c = *(*f)++;
if(c == '-') {
s++;
continue;
}
if(c != ' ' && c != '\n')
break;
}
if(c == 0) {
*p = 0;
return 0;
}
l = 0;
for(;;) {
if(c == ' ' || c == '\n')
break;
if(c < '0' || c > '9')
return 1;
l = l*10 + c-'0';
c = *(*f)++;
}
if(s)
l = -l;
*p = l;
return 0;
}
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