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Diffstat (limited to 'ext/calendar/french.c')
| -rw-r--r-- | ext/calendar/french.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/ext/calendar/french.c b/ext/calendar/french.c deleted file mode 100644 index 5b4dd53750..0000000000 --- a/ext/calendar/french.c +++ /dev/null @@ -1,160 +0,0 @@ -/* $selId: french.c,v 2.0 1995/10/24 01:13:06 lees Exp $ - * Copyright 1993-1995, Scott E. Lee, all rights reserved. - * Permission granted to use, copy, modify, distribute and sell so long as - * the above copyright and this permission statement are retained in all - * copies. THERE IS NO WARRANTY - USE AT YOUR OWN RISK. - */ - -/************************************************************************** - * - * These are the externally visible components of this file: - * - * void - * SdnToFrench( - * long int sdn, - * int *pYear, - * int *pMonth, - * int *pDay); - * - * Convert a SDN to a French republican calendar date. If the input SDN is - * before the first day of year 1 or after the last day of year 14, the - * three output values will all be set to zero, otherwise *pYear will be in - * the range 1 to 14 inclusive; *pMonth will be in the range 1 to 13 - * inclusive; *pDay will be in the range 1 to 30 inclusive. If *pMonth is - * 13, the SDN represents one of the holidays at the end of the year and - * *pDay will be in the range 1 to 6 inclusive. - * - * long int - * FrenchToSdn( - * int year, - * int month, - * int day); - * - * Convert a French republican calendar date to a SDN. Zero is returned - * when the input date is detected as invalid or out of the supported - * range. The return value will be > 0 for all valid, supported dates, but - * there are some invalid dates that will return a positive value. To - * verify that a date is valid, convert it to SDN and then back and compare - * with the original. - * - * char *FrenchMonthName[14]; - * - * Convert a French republican month number (1 to 13) to the name of the - * French republican month (null terminated). An index of 13 (for the - * "extra" days at the end of the year) will return the string "Extra". An - * index of zero will return a zero length string. - * - * VALID RANGE - * - * These routines only convert dates in years 1 through 14 (Gregorian - * dates 22 September 1792 through 22 September 1806). This more than - * covers the period when the calendar was in use. - * - * I would support a wider range of dates, but I have not been able to - * find an authoritative definition of when leap years were to have - * occurred. There are suggestions that it was to skip a leap year ever - * 100 years like the Gregorian calendar. - * - * CALENDAR OVERVIEW - * - * The French republican calendar was adopted in October 1793 during - * the French Revolution and was abandoned in January 1806. The intent - * was to create a new calendar system that was based on scientific - * principals, not religious traditions. - * - * The year is divided into 12 months of 30 days each. The remaining 5 - * to 6 days in the year are grouped at the end and are holidays. Each - * month is divided into three decades (instead of weeks) of 10 days - * each. - * - * The epoch (first day of the first year) is 22 September 1792 in the - * Gregorian calendar. Leap years are every fourth year (year 3, 7, - * 11, etc.) - * - * TESTING - * - * This algorithm has been tested from the year 1 to 14. The source - * code of the verification program is included in this package. - * - * REFERENCES - * - * I have found no detailed, authoritative reference on this calendar. - * The algorithms are based on a preponderance of less authoritative - * sources. - * - **************************************************************************/ - -#include "sdncal.h" - -#define FRENCH_SDN_OFFSET 2375474 -#define DAYS_PER_4_YEARS 1461 -#define DAYS_PER_MONTH 30 -#define FIRST_VALID 2375840 -#define LAST_VALID 2380952 - -void SdnToFrench( - long int sdn, - int *pYear, - int *pMonth, - int *pDay) -{ - long int temp; - int dayOfYear; - - if (sdn < FIRST_VALID || sdn > LAST_VALID) { - *pYear = 0; - *pMonth = 0; - *pDay = 0; - return; - } - temp = (sdn - FRENCH_SDN_OFFSET) * 4 - 1; - *pYear = temp / DAYS_PER_4_YEARS; - dayOfYear = (temp % DAYS_PER_4_YEARS) / 4; - *pMonth = dayOfYear / DAYS_PER_MONTH + 1; - *pDay = dayOfYear % DAYS_PER_MONTH + 1; -} - -long int FrenchToSdn( - int year, - int month, - int day) -{ - /* check for invalid dates */ - if (year < 1 || year > 14 || - month < 1 || month > 13 || - day < 1 || day > 30) { - return (0); - } - return ((year * DAYS_PER_4_YEARS) / 4 - + (month - 1) * DAYS_PER_MONTH - + day - + FRENCH_SDN_OFFSET); -} - -char *FrenchMonthName[14] = -{ - "", - "Vendemiaire", - "Brumaire", - "Frimaire", - "Nivose", - "Pluviose", - "Ventose", - "Germinal", - "Floreal", - "Prairial", - "Messidor", - "Thermidor", - "Fructidor", - "Extra" -}; - - -/* - * Local variables: - * tab-width: 4 - * c-basic-offset: 4 - * End: - * vim600: sw=4 ts=4 fdm=marker - * vim<600: sw=4 ts=4 - */ |