108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static const char sccsid[] = "@(#)genget.c 8.2 (Berkeley) 5/30/95";
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#endif
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#endif /* not lint */
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#include <ctype.h>
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#include "misc-proto.h"
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#define LOWER(x) (isupper(x) ? tolower(x) : (x))
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/*
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* The prefix function returns 0 if *s1 is not a prefix
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* of *s2. If *s1 exactly matches *s2, the negative of
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* the length is returned. If *s1 is a prefix of *s2,
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* the length of *s1 is returned.
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*/
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int
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isprefix(char *s1, const char *s2)
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{
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char *os1;
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char c1, c2;
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if (*s1 == '\0')
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return(-1);
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os1 = s1;
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c1 = *s1;
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c2 = *s2;
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while (LOWER(c1) == LOWER(c2)) {
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if (c1 == '\0')
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break;
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c1 = *++s1;
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c2 = *++s2;
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}
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return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
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}
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static char *ambiguous; /* special return value for command routines */
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char **
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genget(char *name, char **table, int stlen)
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{
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char **c, **found;
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int n;
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if (name == 0)
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return 0;
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found = 0;
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for (c = table; *c != 0; c = (char **)((char *)c + stlen)) {
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if ((n = isprefix(name, *c)) == 0)
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continue;
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if (n < 0) /* exact match */
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return(c);
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if (found)
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return(&ambiguous);
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found = c;
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}
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return(found);
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}
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/*
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* Function call version of Ambiguous()
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*/
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int
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Ambiguous(char **s)
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{
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return(s == &ambiguous);
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}
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