Annotation of src/usr.bin/telnet/genget.c, Revision 1.6
1.6 ! deraadt 1: /* $OpenBSD: genget.c,v 1.5 2014/07/20 10:32:23 jsg Exp $ */
1.1 deraadt 2:
3: /*-
4: * Copyright (c) 1991, 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. Neither the name of the University nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: /* $KTH: genget.c,v 1.6 1997/05/04 09:01:34 assar Exp $ */
33:
34: #include <ctype.h>
1.3 guenther 35: #include "telnet_locl.h"
1.1 deraadt 36:
37: /*
38: * The prefix function returns 0 if *s1 is not a prefix
39: * of *s2. If *s1 exactly matches *s2, the negative of
40: * the length is returned. If *s1 is a prefix of *s2,
41: * the length of *s1 is returned.
42: */
43: int
44: isprefix(char *s1, char *s2)
45: {
46: char *os1;
47: char c1, c2;
48:
49: if (*s1 == '\0')
50: return(-1);
51: os1 = s1;
52: c1 = *s1;
53: c2 = *s2;
1.4 guenther 54: while (tolower((unsigned char)c1) == tolower((unsigned char)c2)) {
1.1 deraadt 55: if (c1 == '\0')
56: break;
57: c1 = *++s1;
58: c2 = *++s2;
59: }
60: return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
61: }
62:
63: static char *ambiguous; /* special return value for command routines */
64:
65: char **
66: genget(char *name, char **table, int stlen)
67: /* name to match */
68: /* name entry in table */
69: {
70: char **c, **found;
71: int n;
72:
1.5 jsg 73: if (name == NULL)
74: return (NULL);
1.1 deraadt 75:
1.5 jsg 76: found = NULL;
77: for (c = table; *c != NULL; c = (char **)((char *)c + stlen)) {
1.1 deraadt 78: if ((n = isprefix(name, *c)) == 0)
79: continue;
80: if (n < 0) /* exact match */
81: return(c);
82: if (found)
83: return(&ambiguous);
84: found = c;
85: }
86: return(found);
87: }
88:
89: /*
90: * Function call version of Ambiguous()
91: */
92: int
93: Ambiguous(void *s)
94: {
95: return((char **)s == &ambiguous);
96: }