From 1b0a5db816b7610c83615e93095155b1709f55da Mon Sep 17 00:00:00 2001 From: Pixel Date: Tue, 20 Aug 2002 07:42:21 +0000 Subject: Whoops --- generic/checkargs.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++ generic/datecalc.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 165 insertions(+) create mode 100644 generic/checkargs.c create mode 100644 generic/datecalc.c (limited to 'generic') diff --git a/generic/checkargs.c b/generic/checkargs.c new file mode 100644 index 0000000..e1c97be --- /dev/null +++ b/generic/checkargs.c @@ -0,0 +1,85 @@ +/* datedif - calculates the difference in days between two dates + * Copyright (C) 2000 Micael Widell contact: xeniac@linux.nu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include +#include + +int isDateArgument(char* dateString) { + + const int MONTHS[] = {31,0,31,30,31,30,31,31,30,31,30,31}; + int i, day, month, year; + char buffer[5]; + + /* 'today' is a valid date */ + if (strcmp(dateString, "today") == 0) + return 1; + + /* Numeric dates must be eight characters long */ + if (8 != strlen(dateString)) + return 0; + + /* Check that the date is entirely formed of numbers */ + for (i = 0; i < 8; i++) { + if (dateString[i] < '0' || dateString[i] > '9') + return 0; + } + + /* Check that the date exists */ + memset(buffer, 0, 5); + strncpy(buffer, dateString + 6, 2); + day = atoi(buffer); + strncpy(buffer, dateString + 4, 2); + month = atoi(buffer); + month -= 1; + strncpy(buffer, dateString, 4); + year = atoi(buffer); + + /* Validate month */ + if (month < 0 || month > 11) + return 0; + + /* Validating dates is simple when the date does not fall into February */ + if (1 != month) { + if (day < 1 || day > MONTHS[month]) + return 0; + } else { + int feb = 28; + + /* Februarys are a bit tougher issue */ + if (0 == year % 4) { + if (0 == year % 100) { + if (0 == year % 400) { + feb = 29; + } else { + feb = 28; + } + } else { + feb = 29; + } + } + if (day < 1 || day > feb) + return 0; + } + + /* Avoid user from using dates before 16000301, since those will result in + incorrect output */ + if(16000301 > atoi(dateString)) + return 0; + + return 1; +} diff --git a/generic/datecalc.c b/generic/datecalc.c new file mode 100644 index 0000000..e637b26 --- /dev/null +++ b/generic/datecalc.c @@ -0,0 +1,80 @@ +/* datedif - calculates the difference in days between two dates + * Copyright (C) 2000 Micael Widell contact: xeniac@linux.nu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include +#include +#include + + +/* Gaus's formula - days since 1.3.1600 (Gregorian calendar) */ +int days(register int n, register int m, register int y) +{ + register int cy; + if((m -= 2) <= 0){ + m += 12; y--; + } + y -= 1600; cy = y/100; + return 365*y+y/4-cy+cy/4+367*m/12+n-31; +} + + +double dateCalc(char * date1, char * date2){ + + /* Declare the needed variables */ + char* date[2]; + struct tm *date_tm[2]; + time_t date_time_t[2]; + double dateDifference; + int isToday[2] = { 0, 0 }; + char buffer[5]; + int day[2], month[2], year[2], i; + + date[0] = date1; + date[1] = date2; + + /* If any of the arguments are "today", then include today's date in the + right variables */ + for(i = 0; i < 2; i++){ + if(!strcmp(date[i], "today")){ + time(&date_time_t[i]); + date_tm[i] = localtime(&date_time_t[i]); + day[i] = (*date_tm[i]).tm_mday; + month[i] = (*date_tm[i]).tm_mon + 1; + year[i] = (*date_tm[i]).tm_year + 1900; + isToday[i] = 1; + } + } + + /* Cut out the year, month and day from 8-digit datestrings */ + for (i = 0; i < 2; i++){ + if(!isToday[i]){ + memset(buffer, 0, 5); + strncpy(buffer, &date[i][6], 2); + day[i] = atoi(buffer); + strncpy(buffer, &date[i][4], 2); + month[i] = atoi(buffer); + strncpy(buffer, date[i], 4); + year[i] = atoi(buffer); + } + } + + /* Calculate the difference */ + dateDifference = days(day[1], month[1], year[1]) - days(day[0], month[0], year[0]); + + return dateDifference; +} -- cgit v1.2.3