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

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31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static const char sccsid[] = "@(#)genget.c 8.2 (Berkeley) 5/30/95";
37#else
38static const char rcsid[] =
39 "$FreeBSD: head/contrib/telnet/libtelnet/genget.c 63248 2000-07-16 05:48:49Z peter $";
40#endif
41#endif /* not lint */
42
43
44#include <ctype.h>
45
46#define LOWER(x) (isupper(x) ? tolower(x) : (x))
47/*
48 * The prefix function returns 0 if *s1 is not a prefix
49 * of *s2. If *s1 exactly matches *s2, the negative of
50 * the length is returned. If *s1 is a prefix of *s2,
51 * the length of *s1 is returned.
52 */
53 int
54isprefix(s1, s2)
55 register char *s1, *s2;
56{
57 char *os1;
58 register char c1, c2;
59
60 if (*s1 == '\0')
61 return(-1);
62 os1 = s1;
63 c1 = *s1;
64 c2 = *s2;
65 while (LOWER(c1) == LOWER(c2)) {
66 if (c1 == '\0')
67 break;
68 c1 = *++s1;
69 c2 = *++s2;
70 }
71 return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
72}
73
74static char *ambiguous; /* special return value for command routines */
75
76 char **
77genget(name, table, stlen)
78 char *name; /* name to match */
79 char **table; /* name entry in table */
80 int stlen;
81{
82 register char **c, **found;
83 register int n;
84
85 if (name == 0)
86 return 0;
87
88 found = 0;
89 for (c = table; *c != 0; c = (char **)((char *)c + stlen)) {
90 if ((n = isprefix(name, *c)) == 0)
91 continue;

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96 found = c;
97 }
98 return(found);
99}
100
101/*
102 * Function call version of Ambiguous()
103 */
104 int
105Ambiguous(s)
106 char **s;
107{
108 return(s == &ambiguous);
109}