/ ************************************************************************ * * Purpose: By default, display yesterdays date. * If a number is given on the command line, it is subtracted * from todays date and the result printed. * * Author: M.J. Leslie. * * Date: 10-Jan-95 * ************************************************************************/ #include <time.h> #include <stdlib.h> #include <ctype.h> #include <string.h> #define DAYS 1 /* Validate the command line * parmeters */ int check_parm(int argc, char *argv[]); /************************************************************************/ main(int argc, char *argv[]) { time_t seconds; const int one_day = 86400; /* Number of seconds in a day */ int days=DAYS; /* Number of days to subtract. */ /* Checkout the cmd line parms */ if (check_parm( argc, argv)) { /* Data is OK. * Override the default. */ days = atoi(argv[1]); } /* Get current calendar time. * This is the number of seconds * since 1-jan-1970 */ time(&seconds); /* Subtract the required number * of days. */ seconds -= one_day*days; /* Return the required date. */ printf("%s", ctime(&seconds)); /* All done - time to go home. */ exit(1); } /************************************************************************ * * Validate the data enter on the command line. * ************************************************************************/ int check_parm(int argc, char *argv[]) { if (argc > 1 ) /* Q. Have we got parms? */ { if ( !strcmp("-h", argv[1])) /* Q. Help requested? */ { /* Y. */ printf("%s will return the date of a passed day.", argv[0]); puts("\nFor example:"); printf("\t%s \tReturns yesterdays date.\n", argv[0]); printf("\t%s 1 \tReturns yesterdays date.\n", argv[0]); printf("\t%s 365\tReturns the date one year ago.\n\n", argv[0]); exit(0); } /* Do a simple check to validate * the I/P data - not 100% reliable */ if (!isdigit(*argv[1])) { /* Data naff. * End the program. */ printf("%s: Numeric value required.\n", argv[0]); printf("\n\tTry: %s -h for some info.\n\n", argv[0]); exit(0); } return(1); } return(0); }
file: /Techref/language/ccpp/CREF/PROBLEMS/yesterday.c, 2KB, , updated: 1997/4/21 09:53, local time: 2024/8/14 17:26,
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