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getinp.c revision 1.3 
      1 /*	$NetBSD: getinp.c,v 1.3 1995/03/23 08:34:39 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)getinp.c	8.1 (Berkeley) 5/31/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: getinp.c,v 1.3 1995/03/23 08:34:39 cgd Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 # include	<stdio.h>
     45 # include	<ctype.h>
     46 
     47 # define	reg	register
     48 
     49 # define	LINE	70
     50 
     51 static char	buf[257];
     52 
     53 getinp(prompt, list)
     54 char	*prompt, *list[]; {
     55 
     56 	reg int	i, n_match, match;
     57 	char	*sp;
     58 	int	plen;
     59 	static int comp();
     60 
     61 	for (;;) {
     62 inter:
     63 		printf(prompt);
     64 		for (sp = buf; (*sp=getchar()) != '\n'; )
     65 			if (*sp == -1)	/* check for interupted system call */
     66 				goto inter;
     67 			else if (sp != buf || *sp != ' ')
     68 				sp++;
     69 		if (buf[0] == '?' && buf[1] == '\n') {
     70 			printf("Valid inputs are: ");
     71 			for (i = 0, match = 18; list[i]; i++) {
     72 				if ((match+=(n_match=strlen(list[i]))) > LINE) {
     73 					printf("\n\t");
     74 					match = n_match + 8;
     75 				}
     76 				if (*list[i] == '\0') {
     77 					match += 8;
     78 					printf("<RETURN>");
     79 				}
     80 				else
     81 					printf(list[i]);
     82 				if (list[i+1])
     83 					printf(", ");
     84 				else
     85 					putchar('\n');
     86 				match += 2;
     87 			}
     88 			continue;
     89 		}
     90 		*sp = '\0';
     91 		for (sp = buf; *sp; sp++)
     92 			if (isupper(*sp))
     93 				*sp = tolower(*sp);
     94 		for (i = n_match = 0; list[i]; i++)
     95 			if (comp(list[i])) {
     96 				n_match++;
     97 				match = i;
     98 			}
     99 		if (n_match == 1)
    100 			return match;
    101 		else if (buf[0] != '\0')
    102 			printf("Illegal response: \"%s\".  Use '?' to get list of valid answers\n", buf);
    103 	}
    104 }
    105 
    106 static
    107 comp(s1)
    108 char	*s1; {
    109 
    110 	reg char	*sp, *tsp, c;
    111 
    112 	if (buf[0] != '\0')
    113 		for (sp = buf, tsp = s1; *sp; ) {
    114 			c = isupper(*tsp) ? tolower(*tsp) : *tsp;
    115 			tsp++;
    116 			if (c != *sp++)
    117 				return 0;
    118 		}
    119 	else if (*s1 != '\0')
    120 		return 0;
    121 	return 1;
    122 }
    123