1 files changed, 40 insertions, 0 deletions
diff --git a/src/libstddjb/localtm_scan.c b/src/libstddjb/localtm_scan.c
new file mode 100644
index 0000000..b028883
--- /dev/null
+++ b/src/libstddjb/localtm_scan.c
@@ -0,0 +1,40 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <time.h>
+#include <skalibs/djbtime.h>
+#include <skalibs/uint.h>
+
+unsigned int localtm_scan (char const *s, struct tm *l)
+{
+  struct tm ll = { .tm_isdst = -1 } ;
+  unsigned int n = 0 ; unsigned int u ;
+  register unsigned int i = uint_scan(s+n, &u) ;
+  if (!i) goto fail ; n += i ;
+  if (u < 1900) goto fail ; u -= 1900 ; ll.tm_year = u ;
+  if (s[n++] != '-') goto fail ;
+  i = uint_scan(s+n, &u) ;
+  if (!i) goto fail ; n += i ;
+  if (!u || (u > 12)) goto fail ; u-- ; ll.tm_mon = u ;
+  if (s[n++] != '-') goto fail ;
+  i = uint_scan(s+n, &u) ;
+  if (!i) goto fail ; n += i ;
+  if (!u || (u > 31)) goto fail ; ll.tm_mday = u ;
+  if ((s[n] != ' ') && (s[n] != 'T')) goto fail ; n++ ;
+  i = uint_scan(s+n, &u) ;
+  if (!i) goto fail ; n += i ;
+  if (u > 23) goto fail ; ll.tm_hour = u ;
+  if (s[n++] != ':') goto fail ;
+  i = uint_scan(s+n, &u) ;
+  if (!i) goto fail ; n += i ;
+  if (u > 59) goto fail ; ll.tm_min = u ;
+  if (s[n++] != ':') goto fail ;
+  i = uint_scan(s+n, &u) ;
+  if (!i) goto fail ; n += i ;
+  if (u > 60) goto fail ; ll.tm_sec = u ;
+  if (mktime(&ll) == (time_t)-1) goto fail ;
+  *l = ll ;
+  return n ;
+ fail:
+  return (errno = EINVAL, 0) ;
+}