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/*
Copyright (C) 1993-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Inetutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see `http://www.gnu.org/licenses/'. */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <ctype.h>
#define LOWER(x) (isupper(x) ? tolower(x) : (x))
/*
* The prefix function returns 0 if *s1 is not a prefix
* of *s2. If *s1 exactly matches *s2, the negative of
* the length is returned. If *s1 is a prefix of *s2,
* the length of *s1 is returned.
*/
int
isprefix (const char *s1, const char *s2)
{
const char *os1;
char c1, c2;
if (*s1 == '\0')
return (-1);
os1 = s1;
c1 = *s1;
c2 = *s2;
while (LOWER (c1) == LOWER (c2))
{
if (c1 == '\0')
break;
c1 = *++s1;
c2 = *++s2;
}
return (*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
}
static char *ambiguous; /* special return value for command routines */
/* char *name; name to match */
/* char **table; name entry in table */
char **
genget (const char *name, char **table, int stlen)
{
char **c, **found;
int n;
if (name == 0)
return 0;
found = 0;
for (c = table; *c != 0; c = (char **) ((char *) c + stlen))
{
if ((n = isprefix (name, *c)) == 0)
continue;
if (n < 0) /* exact match */
return (c);
if (found)
return (&ambiguous);
found = c;
}
return (found);
}
/*
* Function call version of Ambiguous()
*/
int
Ambiguous (void *s)
{
return (s == &ambiguous);
}
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