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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "utc-offset.h"
#include "utc-mktime.h"
#include "imap-date.h"
#include <ctype.h>
static const char *month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static int parse_timezone(const char *str)
{
int offset;
/* +|-zone */
if ((*str != '+' && *str != '-') ||
!i_isdigit(str[1]) || !i_isdigit(str[2]) ||
!i_isdigit(str[3]) || !i_isdigit(str[4]))
return 0;
offset = (str[1]-'0') * 10*60 + (str[2]-'0') * 60 +
(str[3]-'0') * 10 + (str[4]-'0');
return *str == '+' ? offset : -offset;
}
static const char *imap_parse_date_internal(const char *str, struct tm *tm)
{
int i;
if (str == NULL || *str == '\0')
return NULL;
i_zero(tm);
/* "dd-mon-yyyy [hh:mi:ss +|-zone]"
dd is 1-2 digits and may be prefixed with space or zero. */
if (str[0] == ' ') {
/* " d-..." */
str++;
}
if (!(i_isdigit(str[0]) && (str[1] == '-' ||
(i_isdigit(str[1]) && str[2] == '-'))))
return NULL;
tm->tm_mday = (str[0]-'0');
if (str[1] == '-')
str += 2;
else {
tm->tm_mday = (tm->tm_mday * 10) + (str[1]-'0');
str += 3;
}
/* month name */
for (i = 0; i < 12; i++) {
if (strncasecmp(month_names[i], str, 3) == 0) {
tm->tm_mon = i;
break;
}
}
if (i == 12 || str[3] != '-')
return NULL;
str += 4;
/* yyyy */
if (!i_isdigit(str[0]) || !i_isdigit(str[1]) ||
!i_isdigit(str[2]) || !i_isdigit(str[3]))
return NULL;
tm->tm_year = (str[0]-'0') * 1000 + (str[1]-'0') * 100 +
(str[2]-'0') * 10 + (str[3]-'0') - 1900;
str += 4;
return str;
}
static bool imap_mktime(struct tm *tm, time_t *time_r)
{
*time_r = utc_mktime(tm);
if (*time_r != (time_t)-1)
return TRUE;
/* the date is outside valid range for time_t. it might still be
technically valid though, so try to handle this case.
with 64bit time_t the full 0..9999 year range is valid. */
if (tm->tm_year <= 100) {
/* too old. time_t can be signed or unsigned, handle
both cases. */
*time_r = (time_t)-1 < (int)0 ? INT_MIN : 0;
} else {
/* too high. return the highest allowed value.
we shouldn't get here with 64bit time_t,
but handle that anyway. */
#if (TIME_T_MAX_BITS == 32 || TIME_T_MAX_BITS == 64)
*time_r = (1UL << (TIME_T_MAX_BITS-1)) - 1;
#else
*time_r = (1UL << TIME_T_MAX_BITS) - 1;
#endif
}
return FALSE;
}
bool imap_parse_date(const char *str, time_t *timestamp_r)
{
struct tm tm;
str = imap_parse_date_internal(str, &tm);
if (str == NULL || str[0] != '\0')
return FALSE;
tm.tm_isdst = -1;
(void)imap_mktime(&tm, timestamp_r);
return TRUE;
}
bool imap_parse_datetime(const char *str, time_t *timestamp_r,
int *timezone_offset_r)
{
struct tm tm;
str = imap_parse_date_internal(str, &tm);
if (str == NULL)
return FALSE;
if (str[0] != ' ')
return FALSE;
str++;
/* hh: */
if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ':')
return FALSE;
tm.tm_hour = (str[0]-'0') * 10 + (str[1]-'0');
str += 3;
/* mm: */
if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ':')
return FALSE;
tm.tm_min = (str[0]-'0') * 10 + (str[1]-'0');
str += 3;
/* ss */
if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ' ')
return FALSE;
tm.tm_sec = (str[0]-'0') * 10 + (str[1]-'0');
str += 3;
/* timezone */
*timezone_offset_r = parse_timezone(str);
tm.tm_isdst = -1;
if (imap_mktime(&tm, timestamp_r))
*timestamp_r -= *timezone_offset_r * 60;
return TRUE;
}
static void imap_to_date_tm(char buf[11], const struct tm *tm)
{
int year;
/* dd-mon- */
buf[0] = (tm->tm_mday / 10) + '0';
buf[1] = (tm->tm_mday % 10) + '0';
buf[2] = '-';
memcpy(buf+3, month_names[tm->tm_mon], 3);
buf[6] = '-';
/* yyyy */
year = tm->tm_year + 1900;
buf[7] = (year / 1000) + '0';
buf[8] = ((year / 100) % 10) + '0';
buf[9] = ((year / 10) % 10) + '0';
buf[10] = (year % 10) + '0';
}
static const char *
imap_to_datetime_tm(const struct tm *tm, int timezone_offset)
{
char *buf;
/* @UNSAFE: but faster than t_strdup_printf() call.. */
buf = t_malloc0(27);
imap_to_date_tm(buf, tm);
buf[11] = ' ';
/* hh:mi:ss */
buf[12] = (tm->tm_hour / 10) + '0';
buf[13] = (tm->tm_hour % 10) + '0';
buf[14] = ':';
buf[15] = (tm->tm_min / 10) + '0';
buf[16] = (tm->tm_min % 10) + '0';
buf[17] = ':';
buf[18] = (tm->tm_sec / 10) + '0';
buf[19] = (tm->tm_sec % 10) + '0';
buf[20] = ' ';
/* timezone */
if (timezone_offset >= 0)
buf[21] = '+';
else {
buf[21] = '-';
timezone_offset = -timezone_offset;
}
buf[22] = (timezone_offset / 600) + '0';
buf[23] = ((timezone_offset / 60) % 10) + '0';
buf[24] = ((timezone_offset % 60) / 10) + '0';
buf[25] = (timezone_offset % 10) + '0';
buf[26] = '\0';
return buf;
}
const char *imap_to_datetime(time_t timestamp)
{
struct tm *tm;
int timezone_offset;
tm = localtime(×tamp);
timezone_offset = utc_offset(tm, timestamp);
return imap_to_datetime_tm(tm, timezone_offset);
}
const char *imap_to_datetime_tz(time_t timestamp, int timezone_offset)
{
const struct tm *tm;
time_t adjusted = timestamp + timezone_offset*60;
tm = gmtime(&adjusted);
return imap_to_datetime_tm(tm, timezone_offset);
}
bool imap_to_date(time_t timestamp, const char **str_r)
{
const struct tm *tm;
char *buf;
tm = localtime(×tamp);
buf = t_malloc0(12);
imap_to_date_tm(buf, tm);
*str_r = buf;
return tm->tm_hour == 0 && tm->tm_min == 0 && tm->tm_sec == 0;
}
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