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getinp.c revision 1.5 
      1 /*	$NetBSD: getinp.c,v 1.5 1997/03/29 20:42:22 thorpej 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 1.5 1997/03/29 20:42:22 thorpej Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 # include	<stdio.h>
     45 # include	<string.h>
     46 # include	<ctype.h>
     47 
     48 # define	reg	register
     49 
     50 # define	LINE	70
     51 
     52 static char	buf[257];
     53 
     54 getinp(prompt, list)
     55 char	*prompt, *list[]; {
     56 
     57 	reg int	i, n_match, match;
     58 	char	*sp;
     59 	int	c;
     60 	int	plen;
     61 	static int comp();
     62 
     63 	for (;;) {
     64 inter:
     65 		printf(prompt);
     66 		for (sp = buf; (c=getchar()) != '\n'; ) {
     67 			*sp = c;
     68 			if (c == -1)	/* check for interupted system call */
     69 				goto inter;
     70 			else if (sp != buf || *sp != ' ')
     71 				sp++;
     72 		}
     73 		*sp = c;
     74 		if (buf[0] == '?' && buf[1] == '\n') {
     75 			printf("Valid inputs are: ");
     76 			for (i = 0, match = 18; list[i]; i++) {
     77 				if ((match+=(n_match=strlen(list[i]))) > LINE) {
     78 					printf("\n\t");
     79 					match = n_match + 8;
     80 				}
     81 				if (*list[i] == '\0') {
     82 					match += 8;
     83 					printf("<RETURN>");
     84 				}
     85 				else
     86 					printf(list[i]);
     87 				if (list[i+1])
     88 					printf(", ");
     89 				else
     90 					putchar('\n');
     91 				match += 2;
     92 			}
     93 			continue;
     94 		}
     95 		*sp = '\0';
     96 		for (sp = buf; *sp; sp++)
     97 			if (isupper(*sp))
     98 				*sp = tolower(*sp);
     99 		for (i = n_match = 0; list[i]; i++)
    100 			if (comp(list[i])) {
    101 				n_match++;
    102 				match = i;
    103 			}
    104 		if (n_match == 1)
    105 			return match;
    106 		else if (buf[0] != '\0')
    107 			printf("Illegal response: \"%s\".  Use '?' to get list of valid answers\n", buf);
    108 	}
    109 }
    110 
    111 static
    112 comp(s1)
    113 char	*s1; {
    114 
    115 	reg char	*sp, *tsp, c;
    116 
    117 	if (buf[0] != '\0')
    118 		for (sp = buf, tsp = s1; *sp; ) {
    119 			c = isupper(*tsp) ? tolower(*tsp) : *tsp;
    120 			tsp++;
    121 			if (c != *sp++)
    122 				return 0;
    123 		}
    124 	else if (*s1 != '\0')
    125 		return 0;
    126 	return 1;
    127 }
    128