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 81965 2001-08-20 12:28:40Z markm $";
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 */
53int
54isprefix(char *s1, char *s2)
55{
56 char *os1;
57 char c1, c2;
58
59 if (*s1 == '\0')
60 return(-1);
61 os1 = s1;
62 c1 = *s1;
63 c2 = *s2;
64 while (LOWER(c1) == LOWER(c2)) {
65 if (c1 == '\0')
66 break;
67 c1 = *++s1;
68 c2 = *++s2;
69 }
70 return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
71}
72
73static char *ambiguous; /* special return value for command routines */
74
75char **
76genget(char *name, char **table, int stlen)
77{
78 char **c, **found;
79 int n;
80
81 if (name == 0)
82 return 0;
83
84 found = 0;
85 for (c = table; *c != 0; c = (char **)((char *)c + stlen)) {
86 if ((n = isprefix(name, *c)) == 0)
87 continue;

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92 found = c;
93 }
94 return(found);
95}
96
97/*
98 * Function call version of Ambiguous()
99 */
100int
101Ambiguous(char *s)
102{
103 return((char **)s == &ambiguous);
104}