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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.
*/
/* getchr -- ask user to select a character
*
* Usage: i = getchr (prompt,legals,defalt)
* int i;
* char *prompt, *legals, defalt;
*
* Prints the message: prompt (legals) [defalt]
* and allows the user to type a line. The first character
* the user types is searched for in the string "legals"; if it
* is there, its index is returned; otherwise, the user must
* try again. If the user just types carriage return, the
* "defalt" character will be searched for. In any case, note
* that is the INDEX (i.e. 0, 1, 2, ...) of the
* character that is returned.
* On error or EOF in the standard input, the default is used.
*
* HISTORY
* $Log: getchr.c,v $
* Revision 1.2 90/12/11 17:53:49 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 use default value on EOF or error in standard input.
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Rewritten for VAX.
*
*/
#include <stdio.h>
char *index();
int getchr (prompt, legals, defalt)
char *prompt, *legals, defalt;
{
register int i;
register char *p;
char input [200];
fflush (stdout);
do {
fprintf (stderr,"%s (%s) [%c] ",prompt,legals,defalt);
fflush (stderr);
if (gets (input) == NULL) *input = defalt;
if (*input == '\0') *input = defalt;
p = index (legals, *input);
if (p == 0)
fprintf (stderr,"Must be one of: %s\n",legals);
else
i = (p - legals);
}
while (p == 0);
return (i);
}
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