diff options
Diffstat (limited to 'time/strftime.c')
| -rw-r--r-- | time/strftime.c | 93 |
1 files changed, 78 insertions, 15 deletions
diff --git a/time/strftime.c b/time/strftime.c index 38acc6478d..214f82f488 100644 --- a/time/strftime.c +++ b/time/strftime.c @@ -75,7 +75,11 @@ Cambridge, MA 02139, USA. */ #endif #endif -static unsigned int week __P((const struct tm *const, int, int)); +/* Uncomment following line in the production version. */ +/* #define NDEBUG */ +#include <assert.h> + +static unsigned int week __P ((const struct tm *const, int, int)); #define add(n, f) \ @@ -91,7 +95,7 @@ static unsigned int week __P((const struct tm *const, int, int)); p += (n); \ } \ } while (0) -#define cpy(n, s) add((n), memcpy((PTR) p, (PTR) (s), (n))) +#define cpy(n, s) add ((n), memcpy((PTR) p, (PTR) (s), (n))) #ifdef _LIBC #define fmt(n, args) add((n), if (sprintf args != (n)) return 0) @@ -187,8 +191,8 @@ strftime (s, maxsize, format, tp) size_t am_len = 3; size_t ap_len = 2; #endif - size_t wkday_len = strlen(f_wkday); - size_t month_len = strlen(f_month); + size_t wkday_len = strlen (f_wkday); + size_t month_len = strlen (f_month); const unsigned int y_week0 = week (tp, 0, 7); const unsigned int y_week1 = week (tp, 1, 7); const unsigned int y_week2 = week (tp, 1, 3); @@ -228,10 +232,10 @@ strftime (s, maxsize, format, tp) const char *subfmt; #if HAVE_MBLEN - if (!isascii(*f)) + if (!isascii (*f)) { /* Non-ASCII, may be a multibyte. */ - int len = mblen(f, strlen(f)); + int len = mblen (f, strlen (f)); if (len > 0) { cpy(len, f); @@ -242,7 +246,7 @@ strftime (s, maxsize, format, tp) if (*f != '%') { - add(1, *p = *f); + add (1, *p = *f); continue; } @@ -268,24 +272,24 @@ strftime (s, maxsize, format, tp) { case '\0': case '%': - add(1, *p = *f); + add (1, *p = *f); break; case 'a': - cpy(aw_len, a_wkday); + cpy (aw_len, a_wkday); break; case 'A': - cpy(wkday_len, f_wkday); + cpy (wkday_len, f_wkday); break; case 'b': case 'h': /* GNU extension. */ - cpy(am_len, a_month); + cpy (am_len, a_month); break; case 'B': - cpy(month_len, f_month); + cpy (month_len, f_month); break; case 'c': @@ -392,7 +396,7 @@ strftime (s, maxsize, format, tp) break; case 'p': - cpy(ap_len, ampm); + cpy (ap_len, ampm); break; case 'R': /* GNU extension. */ @@ -406,17 +410,38 @@ strftime (s, maxsize, format, tp) case 'S': DO_NUMBER (2, tp->tm_sec); + case 's': /* GNU extension. */ + { + struct tm writable_tm = *tp; + unsigned long int num = (unsigned long int) mktime (&writable_tm); + /* `3 * sizeof (unsigned long int)' is an approximation of + the size of the decimal representation of NUM, valid + for sizes <= 16. */ + int printed = 3 * sizeof (unsigned long int); + maxdigits = printed; + assert (sizeof (unsigned long int) <= 16); +#ifdef _LIBC + add (maxdigits, printed = sprintf (p, "%lu", num)); +#else + add (maxdigits, sprintf (p, "%lu", num); printed = strlen (p)); +#endif + /* Back up if fewer than MAXDIGITS chars written for pad_none. */ + p -= maxdigits - printed; + i -= maxdigits - printed; + } + break; + case 'X': #ifdef _NL_CURRENT subfmt = _NL_CURRENT (LC_TIME, T_FMT); goto subformat; #endif /* Fall through. */ - case 'T': /* GNU extenstion. */ + case 'T': /* GNU extension. */ subfmt = "%H:%M:%S"; goto subformat; - case 't': /* GNU extenstion. */ + case 't': /* GNU extension. */ add (1, *p = '\t'); break; @@ -442,8 +467,46 @@ strftime (s, maxsize, format, tp) cpy(zonelen, zone); break; + case 'z': + { + struct tm tml = *tp; + time_t t = mktime (&tml); + struct tm tmg; + int diff; + + tml = *localtime (&t); /* Canonicalize the local time. */ + tmg = *gmtime (&t); + + /* Compute the difference. */ + diff = tml.tm_min - tmg.tm_min; + diff += 60 * (tml.tm_hour - tmg.tm_hour); + + if (tml.tm_mon != tmg.tm_mon) + { + /* We assume no timezone differs from UTC by more than + +- 23 hours. This should be safe. */ + if (tmg.tm_mday == 1) + tml.tm_mday = 0; + else /* tml.tm_mday == 1 */ + tmg.tm_mday = 0; + } + diff += 1440 * (tml.tm_mday - tmg.tm_mday); + + if (diff < 0) + { + add (1, *p = '-'); + diff = -diff; + } + else + add (1, *p = '+'); + + pad = pad_zero; + DO_NUMBER (4, ((diff / 60) % 24) * 100 + diff % 60); + } + default: /* Bad format. */ + add (1, *p = *f); break; } } |