1 files changed, 130 insertions, 5 deletions
diff --git a/src/launcherutil.c b/src/launcherutil.c
index 4a866f5..11d5e00 100644
--- a/src/launcherutil.c
+++ b/src/launcherutil.c
@@ -252,11 +252,6 @@ int l2_launcher_mkdir_parents_ex(const char *path, unsigned ignore)
   return 0;
 }
 
-char *l2_launcher_parse_iso_time(const char *str, struct tm *ts)
-{
-  return strptime(str, "%FT%T%z", ts); /* TODO: replace with something portable */
-}
-
 void l2_launcher_download_init(struct l2_dlbuf *buf)
 {
   buf->data = NULL;
@@ -655,3 +650,133 @@ int l2_launcher_ftw(const char *path, int depth, l2_ftw_proc_t *proc, void *user
   
   return res;
 }
+
+int l2_launcher__parse_u64(const char *num, size_t len, uint64_t *onum)
+{
+  uint64_t accum = 0;
+  for (; len; --len, ++num) {
+    accum *= 10;
+    if (*num >= '0' && *num <= '9') {
+      accum += *num - '0';
+    } else {
+      return -1;
+    }
+  }
+
+  *onum = accum;
+  return 0;
+}
+
+int l2_parse_time(const char *timestr, time_t *ocaltime)
+{
+#define L2_TM_PARSE_FIELD(_tmstr, _len, _tmp, _type, _field) do {     \
+    if (l2_launcher__parse_u64(_tmstr, _len, &(_tmp)) < 0) return -1; \
+    _field = (_type)(_tmp);                                           \
+    _tmstr += _len;                                                   \
+  } while (0)
+
+#define L2_TM_ENSURE_CHAR(_tmstr, _ch) do { \
+    if (*(_tmstr) != _ch) return -1;        \
+    _tmstr += 1;                            \
+  } while (0)
+
+#define L2_TM_ASSERT_RANGE(_field, _min, _max) do { \
+    L2_DIAG_PUSH L2_DIAG_IGNORED(-Wtype-limits)     \
+    if (_field < _min || _field > _max) return -1;  \
+    L2_DIAG_POP                                     \
+  } while (0)
+
+  uint64_t temp;
+  struct tm otime;
+  time_t timeres;
+  memset(&otime, 0, sizeof(otime));
+  otime.tm_isdst = -1;
+
+#ifndef NDEBUG
+  const char *origstr = timestr;
+#endif
+
+  /* full-date */
+  /* date-fullyear */
+  L2_TM_PARSE_FIELD(timestr, 4, temp, int, otime.tm_year);
+  L2_TM_ENSURE_CHAR(timestr, '-');
+  otime.tm_year -= 1900;
+
+  /* date-month */
+  L2_TM_PARSE_FIELD(timestr, 2, temp, int, otime.tm_mon);
+  L2_TM_ASSERT_RANGE(temp, 1, 12);
+  --otime.tm_mon;
+
+  L2_TM_ENSURE_CHAR(timestr, '-');
+
+  /* date-mday */
+  L2_TM_PARSE_FIELD(timestr, 2, temp, int, otime.tm_mday);
+  L2_TM_ASSERT_RANGE(temp, 1, 31);
+
+  if (*timestr != 't' && *timestr != 'T') return -1;
+  ++timestr;
+
+  /* full-time */
+
+  /* partial-time */
+  /* time-hour */
+  L2_TM_PARSE_FIELD(timestr, 2, temp, int, otime.tm_hour);
+  L2_TM_ASSERT_RANGE(temp, 0, 23);
+  L2_TM_ENSURE_CHAR(timestr, ':');
+
+  /* time-minute */
+  L2_TM_PARSE_FIELD(timestr, 2, temp, int, otime.tm_min);
+  L2_TM_ASSERT_RANGE(temp, 0, 59);
+  L2_TM_ENSURE_CHAR(timestr, ':');
+
+  /* time-second */
+  L2_TM_PARSE_FIELD(timestr, 2, temp, int, otime.tm_sec);
+  L2_TM_ASSERT_RANGE(temp, 0, 60); /* for leap seconds */
+
+  /* ignoring time-secfrac (idc about it lol) */
+  if (*timestr == '.') {
+    do {
+      ++timestr;
+    } while (*timestr >= '0' && *timestr <= '9');
+  }
+
+  /* time-offset */
+  if (*timestr == 'Z' || *timestr == 'z') {
+    goto done;
+  }
+
+  int tzoff_mult;
+  switch (*timestr) {
+    case '+':
+      tzoff_mult = 1;
+      break;
+    case '-':
+      tzoff_mult = -1;
+      break;
+    default: return -1;
+  }
+
+  ++timestr;
+
+  CMD_DEBUG("trying to parse timestamp %s, which has zoneoffset. "
+            "This is not fully supported (contains bugs 100%% guaranteed or your money back)", origstr);
+
+  int houroff;
+  L2_TM_PARSE_FIELD(timestr, 2, temp, int, houroff);
+  L2_TM_ASSERT_RANGE(houroff, 0, 23);
+  L2_TM_ENSURE_CHAR(timestr, ':');
+
+  int minoff;
+  L2_TM_PARSE_FIELD(timestr, 2, temp, int, minoff);
+  L2_TM_ASSERT_RANGE(minoff, 0, 59);
+
+  otime.tm_hour -= houroff * tzoff_mult;
+  otime.tm_min -= minoff * tzoff_mult;
+
+done:
+  timeres = mktime(&otime);
+  if (timeres == (time_t)-1) return -1;
+  *ocaltime = timeres;
+
+  return 0;
+}