diff options
Diffstat (limited to 'lib/checkargs.c')
| -rw-r--r-- | lib/checkargs.c | 170 |
1 files changed, 85 insertions, 85 deletions
diff --git a/lib/checkargs.c b/lib/checkargs.c index fcd84ed..4fee446 100644 --- a/lib/checkargs.c +++ b/lib/checkargs.c @@ -1,85 +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 <stdlib.h>
-#include <string.h>
-
-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;
-}
+/* 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 <stdlib.h> +#include <string.h> + +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; +} |