/usr/share/doc/opt/examples/birthday.c is in opt 3.19-1.3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | /* OPT v3.19: options parsing tool */
/*
* This SOFTWARE has been authored by an employee of the University of
* California, operator of the Los Alamos National Laboratory under
* Contract No. W-7405-ENG-36 with the U.S. Department of Energy. The
* U.S. Government has rights to use, reproduce, and distribute this
* SOFTWARE. Neither the Government nor the University makes any
* warranty, express or implied, or assumes any liability or
* responsibility for the use of this SOFTWARE. If SOFTWARE is modified
* to produce derivative works, such modified SOFTWARE should be clearly
* marked, so as not to confuse it with the version available from LANL.
*
* Additionally, this program is free software; you can distribute 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 any later version. Accordingly, this program is
* distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details (http://www.gnu.org/copyleft/gpl.txt).
*
*
* The OPT package is available from
* http://nis-www.lanl.gov/~jt/Software
*/
/* birthday.c */
#include <stdio.h>
#include <opt.h> /* part of opt package */
/* Parameters that user has access to via opt package;
* They are typically (but not necessarily) global variables.
* Their default values are provided in the assignement statements.
*/
int month=9;
int day=11;
int year=1989;
int verb=0;
int pade=0;
int greg=0;
/* All of what the program itself does is in the birthday() function;
* This function does what a non-options parsing main() might do.
*/
int birthday(int argc, char **argv)
{
if (month == 9 && day == 11 && year == 1989)
printf("Happy birthday, Max\n");
else if (month == 4 && day == 24 && year == 1993)
printf("Happy birthday, Sky\n");
if (verb)
printf("Hello, world: %4d/%02d/%02d\n",year,month,day);
return OPT_OK;
}
/* all of the options parsing is in the new main() function */
int main(int argc, char **argv)
{
/* optrega() registers short name '-m' and long name '--month' to
* variable 'month', and provides brief description "Month"
*/
optrega(&month,OPT_INT,'m',"month","Month");
optrega(&day, OPT_INT,'d',"day", "Day of month");
/* optreg() only provides short name '-y' */
optreg(&year,OPT_INT,'y',"Year");
/* register some flag variables... */
optreg(&verb,OPT_INTLEVEL,'v',"Verbose");
optreg(&pade,OPT_BOOL,'p',"Use Pade Approximants");
optreg(&greg,OPT_BOOL,'g',"Gregorian");
/* the function birthday() is registered with opt */
optMain(birthday);
/* opt() is the routine that actually parses the argc/argv
* variables
*/
opt(&argc,&argv);
opt_free();
/* and when it's done, argc/argv will contain the leftover
* argc/argv variables, including the same argv[0] as in
* the original argc/argv
*/
/* Now that variables are parsed, run birthday() */
return birthday(argc,argv);
}
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