svn commit: r272122 - head/lib/libc/stdtime
Bryan Drewery
bdrewery at FreeBSD.org
Thu Sep 25 19:53:31 UTC 2014
On 9/25/2014 1:52 PM, Pedro F. Giffuni wrote:
> Author: pfg
> Date: Thu Sep 25 18:52:17 2014
> New Revision: 272122
> URL: http://svnweb.freebsd.org/changeset/base/272122
>
> Log:
> Add strptime(3) support for %U and %W
>
> Add support for the missing POSIX-2001 %U and %W features: the
> existing FreeBSD strptime code recognizes both directives and
> validates that the week number lies in the permitted range,
> but then simply discards the value.
>
> Initial support for the feature was written by Paul Green with
> important fixes by Andrey Chernov. Additional support for
> handling tm_wday/tm_yday was written by David Carlier.
>
> PR: 137307
> MFC after: 1 month
Seems Relnotes worthy.
>
> Modified:
> head/lib/libc/stdtime/strptime.c
>
> Modified: head/lib/libc/stdtime/strptime.c
> ==============================================================================
> --- head/lib/libc/stdtime/strptime.c Thu Sep 25 18:43:52 2014 (r272121)
> +++ head/lib/libc/stdtime/strptime.c Thu Sep 25 18:52:17 2014 (r272122)
> @@ -55,10 +55,32 @@ __FBSDID("$FreeBSD$");
> #include "un-namespace.h"
> #include "libc_private.h"
> #include "timelocal.h"
> +#include "tzfile.h"
>
> static char * _strptime(const char *, const char *, struct tm *, int *, locale_t);
>
> -#define asizeof(a) (sizeof (a) / sizeof ((a)[0]))
> +#define asizeof(a) (sizeof(a) / sizeof((a)[0]))
> +
> +#define FLAG_NONE (1 << 0)
> +#define FLAG_YEAR (1 << 1)
> +#define FLAG_MONTH (1 << 2)
> +#define FLAG_YDAY (1 << 3)
> +#define FLAG_MDAY (1 << 4)
> +#define FLAG_WDAY (1 << 5)
> +
> +/*
> + * Calculate the week day of the first day of a year. Valid for
> + * the Gregorian calendar, which began Sept 14, 1752 in the UK
> + * and its colonies. Ref:
> + * http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week/
> + */
> +
> +static int
> +first_wday_of(int year)
> +{
> + return (((2 * (3 - (year / 100) % 4)) + (year % 100) +
> + ((year % 100) / 4) + (isleap(year) ? 6 : 0) + 1) % 7);
> +}
>
> static char *
> _strptime(const char *buf, const char *fmt, struct tm *tm, int *GMTp,
> @@ -66,9 +88,17 @@ _strptime(const char *buf, const char *f
> {
> char c;
> const char *ptr;
> + int day_offset = -1, wday_offset;
> int i, len;
> + int flags;
> int Ealternative, Oalternative;
> - struct lc_time_T *tptr = __get_current_time_locale(locale);
> + const struct lc_time_T *tptr = __get_current_time_locale(locale);
> + static int start_of_month[2][13] = {
> + {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
> + {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
> + };
> +
> + flags = FLAG_NONE;
>
> ptr = fmt;
> while (*ptr != 0) {
> @@ -119,7 +149,9 @@ label:
> if (i < 19)
> return (NULL);
>
> - tm->tm_year = i * 100 - 1900;
> + tm->tm_year = i * 100 - TM_YEAR_BASE;
> + flags |= FLAG_YEAR;
> +
> break;
>
> case 'c':
> @@ -197,6 +229,8 @@ label:
> return (NULL);
>
> tm->tm_yday = i - 1;
> + flags |= FLAG_YDAY;
> +
> break;
>
> case 'M':
> @@ -303,7 +337,32 @@ label:
> return (NULL);
>
> tm->tm_wday = i;
> + if (day_offset >= 0 && (i - day_offset) != 0) {
> + tm->tm_yday += i - day_offset;
> + i = 0;
> + while (tm->tm_yday >=
> + start_of_month[isleap(tm->tm_year +
> + TM_YEAR_BASE)][i])
> + i++;
> + if (i > 12)
> + {
> + i = 1;
> + tm->tm_yday -=
> + start_of_month[isleap(tm->tm_year +
> + TM_YEAR_BASE)]
> + [12];
> + tm->tm_year++;
> + }
> + tm->tm_mon = i - 1;
> + tm->tm_mday = tm->tm_yday -
> + start_of_month[isleap(tm->tm_year +
> + TM_YEAR_BASE)]
> + [i - 1] + 1;
> + }
> buf += len;
> + flags |= FLAG_YEAR | FLAG_MONTH | FLAG_YDAY |
> + FLAG_MDAY | FLAG_WDAY;
> +
> break;
>
> case 'U':
> @@ -313,6 +372,8 @@ label:
> * information present in the tm structure at this
> * point to calculate a real value, so just check the
> * range for now.
> + * We expect that the year has already been
> + * parsed.
> */
> if (!isdigit_l((unsigned char)*buf, locale))
> return (NULL);
> @@ -327,6 +388,45 @@ label:
> if (i > 53)
> return (NULL);
>
> + /* Week numbers are l-origin. So that we can always
> + * return the date of a Sunday (or Monday), treat week
> + * 0 as week 1.
> + */
> +
> + if (i == 0)
> + i = 1;
> +
> + if (c == 'U')
> + day_offset = TM_SUNDAY;
> + else
> + day_offset = TM_MONDAY;
> +
> + /* Set the date to the first Sunday (or Monday)
> + * of the specified week of the year.
> + */
> +
> + tm->tm_yday = (7 - first_wday_of(tm->tm_year +
> + TM_YEAR_BASE) + day_offset) % 7 + (i - 1) * 7;
> + i = 0;
> + while (tm->tm_yday >=
> + start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)][i])
> + i++;
> + if (i > 12)
> + {
> + i = 1;
> + tm->tm_yday -=
> + start_of_month[isleap(tm->tm_year +
> + TM_YEAR_BASE)][12];
> + tm->tm_year++;
> + }
> + tm->tm_mon = i - 1;
> + tm->tm_mday = tm->tm_yday -
> + start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)]
> + [i - 1] + 1;
> + tm->tm_wday = day_offset;
> + flags |= FLAG_YEAR | FLAG_MONTH | FLAG_YDAY |
> + FLAG_MDAY | FLAG_WDAY;
> +
> break;
>
> case 'w':
> @@ -338,6 +438,7 @@ label:
> return (NULL);
>
> tm->tm_wday = i;
> + flags != FLAG_WDAY;
>
> break;
>
> @@ -374,6 +475,7 @@ label:
> return (NULL);
>
> tm->tm_mday = i;
> + flags |= FLAG_MDAY;
>
> break;
>
> @@ -413,6 +515,8 @@ label:
>
> tm->tm_mon = i;
> buf += len;
> + flags |= FLAG_MONTH;
> +
> break;
>
> case 'm':
> @@ -430,6 +534,7 @@ label:
> return (NULL);
>
> tm->tm_mon = i - 1;
> + flags |= FLAG_MONTH;
>
> break;
>
> @@ -471,13 +576,14 @@ label:
> len--;
> }
> if (c == 'Y')
> - i -= 1900;
> + i -= TM_YEAR_BASE;
> if (c == 'y' && i < 69)
> i += 100;
> if (i < 0)
> return (NULL);
>
> tm->tm_year = i;
> + flags |= FLAG_YEAR;
>
> break;
>
> @@ -543,10 +649,25 @@ label:
> break;
> }
> }
> +
> + if (flags & (FLAG_YEAR | FLAG_MONTH)) {
> + if (!tm->tm_yday && (flags & FLAG_MDAY))
> + tm->tm_yday = start_of_month[isleap(tm->tm_year
> + + TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
> + if (!tm->tm_wday) {
> + i = 0;
> + wday_offset = first_wday_of(tm->tm_year);
> + while (i++ <= tm->tm_yday)
> + if (wday_offset++ >= 6)
> + wday_offset = 0;
> +
> + tm->tm_wday = wday_offset;
> + }
> + }
> +
> return ((char *)buf);
> }
>
> -
> char *
> strptime_l(const char * __restrict buf, const char * __restrict fmt,
> struct tm * __restrict tm, locale_t loc)
>
--
Regards,
Bryan Drewery
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