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059be884 | 1 | /*- |
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2 | * Copyright (c) 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
059be884 | 4 | * |
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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. | |
059be884 DB |
32 | */ |
33 | ||
34 | #ifndef lint | |
ad787160 | 35 | static char sccsid[] = "@(#)genget.c 8.1 (Berkeley) 6/4/93"; |
059be884 DB |
36 | #endif /* not lint */ |
37 | ||
38 | ||
39 | #include <ctype.h> | |
40 | ||
41 | #define LOWER(x) (isupper(x) ? tolower(x) : (x)) | |
42 | /* | |
43 | * The prefix function returns 0 if *s1 is not a prefix | |
44 | * of *s2. If *s1 exactly matches *s2, the negative of | |
45 | * the length is returned. If *s1 is a prefix of *s2, | |
46 | * the length of *s1 is returned. | |
47 | */ | |
48 | int | |
49 | isprefix(s1, s2) | |
50 | register char *s1, *s2; | |
51 | { | |
52 | register int n = 0; | |
53 | char *os1; | |
54 | register char c1, c2; | |
55 | ||
56 | if (*s1 == '\0') | |
57 | return(-1); | |
58 | os1 = s1; | |
59 | c1 = *s1; | |
60 | c2 = *s2; | |
61 | while (LOWER(c1) == LOWER(c2)) { | |
62 | if (c1 == '\0') | |
63 | break; | |
64 | c1 = *++s1; | |
65 | c2 = *++s2; | |
66 | } | |
67 | return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1))); | |
68 | } | |
69 | ||
70 | static char *ambiguous; /* special return value for command routines */ | |
71 | ||
72 | char ** | |
73 | genget(name, table, stlen) | |
74 | char *name; /* name to match */ | |
75 | char **table; /* name entry in table */ | |
76 | int stlen; | |
77 | { | |
78 | register char **c, **found; | |
79 | register 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; | |
88 | if (n < 0) /* exact match */ | |
89 | return(c); | |
90 | if (found) | |
91 | return(&ambiguous); | |
92 | found = c; | |
93 | } | |
94 | return(found); | |
95 | } | |
96 | ||
97 | /* | |
98 | * Function call version of Ambiguous() | |
99 | */ | |
100 | int | |
101 | Ambiguous(s) | |
102 | char *s; | |
103 | { | |
104 | return((char **)s == &ambiguous); | |
105 | } |