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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.
*/
/* getbool -- ask user a yes/no question
*
* Usage: i = getbool (prompt, defalt);
*
* Example: do {...} while (getbool ("More?",1));
*
* Prints prompt string, asks user for response. Defalt is
* 0 (no) or 1 (yes), and is used if user types just carriage return,
* or on end-of-file or error in the standard input.
*
* HISTORY
* $Log: getbool.c,v $
* Revision 1.2 90/12/11 17:53:39 mja
* Add copyright/disclaimer for distribution.
*
* 28-Apr-85 Steven Shafer (sas) at Carnegie-Mellon University
* Modified for 4.2 BSD. Now uses stderr for output.
*
* 23-Oct-82 Steven Shafer (sas) at Carnegie-Mellon University
* Added code to return default if gets returns NULL.
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Rewritten for VAX. Possible changes for the future: accept "t" (true)
* and "f" (false), 0 and 1, etc.
*
*/
#include <stdio.h>
#include <c.h>
int getbool (prompt, defalt)
char *prompt;
int defalt;
{
register int valu;
register char ch;
char input [100];
fflush (stdout);
if (defalt != TRUE && defalt != FALSE) defalt = TRUE;
valu = 2; /* meaningless value */
do {
fprintf (stderr,"%s [%s] ",prompt,(defalt ? "yes" : "no"));
fflush (stderr); /* in case it's buffered */
if (gets (input) == NULL) {
valu = defalt;
}
else {
ch = *input; /* first char */
if (ch == 'y' || ch == 'Y') valu = TRUE;
else if (ch == 'n' || ch == 'N') valu = FALSE;
else if (ch == '\0') valu = defalt;
else fprintf (stderr,"Must begin with 'y' (yes) or 'n' (no).\n");
}
}
while (valu == 2); /* until correct response */
return (valu);
}
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