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#include "stddef.h" // for NULL
#include <ctype.h> // for isdigit
#include <time.h> // for daylight, timezone, tzname, tzset
int daylight = 0;
long timezone = 0;
char *tzname[2] = { "UTC", "UTC" };
void tzset(void)
{
const char *tz = NULL; // getenv("TZ");
if (tz == NULL || *tz == '\0') {
timezone = 0;
daylight = 0;
tzname[0] = tzname[1] = "UTC";
return;
}
const char *p = tz;
char sign = 0;
int hours = 0, mins = 0;
static char stdname[8];
int i = 0;
while (*p && !isdigit((unsigned char)*p) && *p != '+' && *p != '-' && i < 7) {
stdname[i++] = *p++;
}
stdname[i] = '\0';
if (stdname[0])
tzname[0] = stdname;
else
tzname[0] = "LCL";
if (*p == '+' || *p == '-')
sign = *p++;
while (isdigit((unsigned char)*p))
hours = hours * 10 + (*p++ - '0');
if (*p == ':') {
p++;
while (isdigit((unsigned char)*p))
mins = mins * 10 + (*p++ - '0');
}
int total = hours * 3600 + mins * 60;
if (sign == '+')
timezone = -total;
else if (sign == '-')
timezone = total;
else
timezone = 0;
daylight = 0;
tzname[1] = tzname[0];
}
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