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/*
* Copyright (c) 1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND CARNEGIE MELLON UNIVERSITY
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
* SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Users of this software agree to return to Carnegie Mellon any
* improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* Export of this software is permitted only after complying with the
* regulations of the U.S. Deptartment of Commerce relating to the
* Export of Technical Data.
*/
/* boolarg -- parse boolean from string
*
* Usage: i = boolarg (ptr,brk,prompt,defalt);
* int i,defalt;
* char **ptr,*brk,*prompt;
*
* Boolarg will parse an argument from the string pointed to by "ptr",
* bumping ptr to point to the next argument in the string. The
* argument parsed will be converted to a boolean (TRUE if it begins
* with 'y' or 'Y'; FALSE for 'n' or 'N'). If there is no
* argument, or if it is not a boolean value, then getbool() will
* be used to ask the user for a boolean value. In any event,
* the boolean value obtained (from the string or from the user) is
* returned.
* "Brk" is the list of characters which may terminate an argument;
* if 0, then " " is used.
*
* HISTORY
* $Log: boolarg.c,v $
* Revision 1.2 90/12/11 17:50:33 mja
* Add copyright/disclaimer for distribution.
*
* 28-Apr-85 Steven Shafer (sas) at Carnegie-Mellon University
* Modified for 4.2 BSD. Now puts output on stderr.
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Created for VAX.
*
*/
#include <stdio.h>
#include <c.h>
int strcmp();
char *nxtarg();
int getbool();
int boolarg (ptr,brk,prompt,defalt)
char **ptr,*brk,*prompt;
int defalt;
{
register char *arg;
register int valu;
valu = 2; /* meaningless value */
fflush (stdout);
arg = nxtarg (ptr,brk); /* parse an argument */
if (*arg) { /* there was an argument */
switch (*arg) {
case 'n':
case 'N':
valu = FALSE;
break;
case 'y':
case 'Y':
valu = TRUE;
break;
case '?':
break;
default:
fprintf (stderr,"%s not 'yes' or 'no'. ",arg);
}
}
if (valu == 2) valu = getbool (prompt,defalt);
return (valu);
}
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