genget.c

sock5 src app代理软件放心使用

/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifdef SHOW_SCCSIDS
static char sccsid[] = "@(#)genget.c	8.2 (Berkeley) 5/30/95";
#endif

#include "config.h"

#ifndef HAVE_GENGET
#include <ctype.h>

static char *ambiguous;		/* special return value for command routines */

#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(register char *s1, register char *s2) {
    register char c1, c2;
    char *os1;
    
    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)));
}

char **genget(char *name, char ** table, int stlen) {
    register char **c, **found;
    register 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) return(c);
	if (found) return(&ambiguous);
	found = c;
    }

    return(found);
}

/* Function call version of Ambiguous()                                      */
int Ambiguous(char *s) {
    return((char **)s == &ambiguous);
}
#endif