Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / crypto / telnet / libtelnet / genget.c
CommitLineData
984263bc
MD
1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
1de703da
MD
32 *
33 * @(#)genget.c 8.2 (Berkeley) 5/30/95
34 * $FreeBSD: src/crypto/telnet/libtelnet/genget.c,v 1.2.8.2 2002/04/13 10:59:07 markm Exp $
35 * $DragonFly: src/crypto/telnet/libtelnet/genget.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
984263bc
MD
36 */
37
984263bc
MD
38#include <ctype.h>
39
40#include "misc-proto.h"
41
42#define LOWER(x) (isupper(x) ? tolower(x) : (x))
43/*
44 * The prefix function returns 0 if *s1 is not a prefix
45 * of *s2. If *s1 exactly matches *s2, the negative of
46 * the length is returned. If *s1 is a prefix of *s2,
47 * the length of *s1 is returned.
48 */
49int
50isprefix(char *s1, const char *s2)
51{
52 char *os1;
53 char c1, c2;
54
55 if (*s1 == '\0')
56 return(-1);
57 os1 = s1;
58 c1 = *s1;
59 c2 = *s2;
60 while (LOWER(c1) == LOWER(c2)) {
61 if (c1 == '\0')
62 break;
63 c1 = *++s1;
64 c2 = *++s2;
65 }
66 return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
67}
68
69static char *ambiguous; /* special return value for command routines */
70
71char **
72genget(char *name, char **table, int stlen)
73{
74 char **c, **found;
75 int n;
76
77 if (name == 0)
78 return 0;
79
80 found = 0;
81 for (c = table; *c != 0; c = (char **)((char *)c + stlen)) {
82 if ((n = isprefix(name, *c)) == 0)
83 continue;
84 if (n < 0) /* exact match */
85 return(c);
86 if (found)
87 return(&ambiguous);
88 found = c;
89 }
90 return(found);
91}
92
93/*
94 * Function call version of Ambiguous()
95 */
96int
97Ambiguous(char **s)
98{
99 return(s == &ambiguous);
100}