localtm_scan.c (1210B)
1 /* ISC license. */ 2 3 #include <errno.h> 4 #include <time.h> 5 #include <skalibs/types.h> 6 #include <skalibs/djbtime.h> 7 8 size_t localtm_scan (char const *s, struct tm *l) 9 { 10 struct tm ll = { .tm_isdst = -1 } ; 11 size_t n = 0 ; 12 unsigned int u ; 13 size_t i = uint_scan(s+n, &u) ; 14 if (!i) goto fail ; 15 n += i ; 16 if (u < 1900) goto fail ; 17 u -= 1900 ; ll.tm_year = u ; 18 if (s[n++] != '-') goto fail ; 19 i = uint_scan(s+n, &u) ; 20 if (!i) goto fail ; 21 n += i ; 22 if (!u || (u > 12)) goto fail ; 23 u-- ; ll.tm_mon = u ; 24 if (s[n++] != '-') goto fail ; 25 i = uint_scan(s+n, &u) ; 26 if (!i) goto fail ; 27 n += i ; 28 if (!u || (u > 31)) goto fail ; 29 ll.tm_mday = u ; 30 if ((s[n] != ' ') && (s[n] != 'T')) goto fail ; 31 n++ ; 32 i = uint_scan(s+n, &u) ; 33 if (!i) goto fail ; 34 n += i ; 35 if (u > 23) goto fail ; 36 ll.tm_hour = u ; 37 if (s[n++] != ':') goto fail ; 38 i = uint_scan(s+n, &u) ; 39 if (!i) goto fail ; 40 n += i ; 41 if (u > 59) goto fail ; 42 ll.tm_min = u ; 43 if (s[n++] != ':') goto fail ; 44 i = uint_scan(s+n, &u) ; 45 if (!i) goto fail ; 46 n += i ; 47 if (u > 60) goto fail ; 48 ll.tm_sec = u ; 49 if (mktime(&ll) == (time_t)-1) goto fail ; 50 *l = ll ; 51 return n ; 52 fail: 53 return (errno = EINVAL, 0) ; 54 }