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int vtime(struct tm *, const char *, int);
enum vtime_flags {
VTIME_START_SUNDAY = 1
};
#ifdef VTIME_IMPL
static const char * vtime_next_word(const char *);
static const char * vtime_relative3(struct tm *, const char *, const int);
static const char * vtime_relative2(struct tm *, const char *);
static const char* vtime_day_names[] = {
"sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"
};
int
vtime(struct tm *tm, const char *fmt, int flags)
{
int i, j, k;
const char *pnt;
for (; *fmt; fmt++) {
if (isblank(*fmt))
continue;
/* Do relative 1 */
if (*fmt == '+' || *fmt == '-') {
i = isdigit(fmt[1]) ? 0 : 1;
pnt = fmt+1;
while (isdigit(*pnt))
i = i * 10 + (*(pnt++) - '0');
if (fmt[0] == '-')
i = -i;
switch (tolower(*pnt)) {
case 'w':
i *= 7;
/* FALLTHROUGH */
case 'd':
tm->tm_mday += i;
break;
case 'm':
tm->tm_mon += i;
break;
case 'y':
tm->tm_year += i;
break;
default:
return 1;
}
fmt = pnt;
/* No day-time savings. We want the same relative hh:mm */
tm->tm_isdst = -1;
mktime(tm);
continue;
}
/* Absolute 1 */
if (isdigit(fmt[0])) {
i = j = k = -1;
vtime_abs:
k = j;
j = i;
for (i = 0; isdigit(*fmt); fmt++)
i = i * 10 + (*fmt - '0');
if (!isblank(*fmt) && fmt[0]) {
fmt++;
goto vtime_abs;
}
if (k != -1)
tm->tm_year = k + (k < 100 ? (tm->tm_year / 100 * 100) : -1900);
tm->tm_mon = (j == -1) ? tm->tm_mon : j-1;
tm->tm_mday = i;
/* No day-time savings. We want the same relative hh:mm */
tm->tm_isdst = -1;
mktime(tm);
continue;
}
switch (tolower(fmt[0])) {
case 'f':
case 's':
case 'b':
case 'e':
fmt = vtime_relative3(tm, fmt, flags & VTIME_START_SUNDAY);
if (fmt == NULL)
return 1;
break;
case 'p':
case 'l':
case 'n':
case 't':
fmt = vtime_relative2(tm, fmt);
if (fmt == NULL)
return 1;
break;
default:
return 1;
}
}
return 0;
}
static const char *
vtime_relative2(struct tm *tm, const char *s)
{
size_t len;
int i, next = (s[0] == 'n') || (s[0] == 't');
const char *day = vtime_next_word(s);
if (!day[0])
return NULL;
for (len = 0; day[len] && !isblank(day[len]); len++);
for (i = 0; i < 7; i++) {
if (!strncasecmp(day, vtime_day_names[i], len))
break;
}
/* TODO: Could change to words like month/week/year/day */
if (i == 7)
return NULL;
if (next)
i = ((i + 13 - tm->tm_wday) % 7) + 1;
else
i = - (((tm->tm_wday - i + 13) % 7) + 1);
tm->tm_mday += i;
/* No day-time savings. We want the same relative hh:mm */
tm->tm_isdst = -1;
mktime(tm);
for (s = day; s[1] && !isblank(s[1]); s++);
return s;
}
static const char *
vtime_relative3(struct tm *tm, const char *s, const int startSun)
{
int i, toend = tolower(s[0]) == 'e';
const char *type = vtime_next_word(s);
switch (tolower(*type)) {
case 'w':
i = tm->tm_wday;
if (!startSun)
i = (i + 6) % 7;
tm->tm_mday += - i + 6 * toend;
break;
case 'm':
tm->tm_mday = 1;
if (toend) {
tm->tm_mon++;
tm->tm_mday = 0;
}
break;
case 'y':
tm->tm_mday = 1;
tm->tm_mon = 0;
if (toend) {
tm->tm_year++;
tm->tm_mday = 0;
}
break;
default:
return NULL;
}
/* No day-time savings. We want the same relative hh:mm */
tm->tm_isdst = -1;
mktime(tm);
for (s = type; s[1] && !isblank(s[1]); s++);
return s;
}
static const char *
vtime_next_word(const char *s)
{
while (*s && !isblank(*s))
s++;
while (isblank(*s))
s++;
return s;
}
#endif
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