129088Smarkm/*- 229088Smarkm * Copyright (c) 1991, 1993 329088Smarkm * The Regents of the University of California. All rights reserved. 429088Smarkm * 529088Smarkm * Redistribution and use in source and binary forms, with or without 629088Smarkm * modification, are permitted provided that the following conditions 729088Smarkm * are met: 829088Smarkm * 1. Redistributions of source code must retain the above copyright 929088Smarkm * notice, this list of conditions and the following disclaimer. 1029088Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1129088Smarkm * notice, this list of conditions and the following disclaimer in the 1229088Smarkm * documentation and/or other materials provided with the distribution. 1329088Smarkm * 3. All advertising materials mentioning features or use of this software 1429088Smarkm * must display the following acknowledgement: 1529088Smarkm * This product includes software developed by the University of 1629088Smarkm * California, Berkeley and its contributors. 1729088Smarkm * 4. Neither the name of the University nor the names of its contributors 1829088Smarkm * may be used to endorse or promote products derived from this software 1929088Smarkm * without specific prior written permission. 2029088Smarkm * 2129088Smarkm * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2229088Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2329088Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2429088Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2529088Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2629088Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2729088Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2829088Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2929088Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3029088Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3129088Smarkm * SUCH DAMAGE. 3229088Smarkm */ 3329088Smarkm 3484305Smarkm#include <sys/cdefs.h> 3587139Smarkm 3684305Smarkm__FBSDID("$FreeBSD$"); 3784305Smarkm 3829088Smarkm#ifndef lint 3963248Speter#if 0 4029181Smarkmstatic const char sccsid[] = "@(#)genget.c 8.2 (Berkeley) 5/30/95"; 4163248Speter#endif 4229088Smarkm#endif /* not lint */ 4329088Smarkm 4429088Smarkm 4529088Smarkm#include <ctype.h> 4629088Smarkm 4787139Smarkm#include "misc-proto.h" 4887139Smarkm 4929088Smarkm#define LOWER(x) (isupper(x) ? tolower(x) : (x)) 5029088Smarkm/* 5129088Smarkm * The prefix function returns 0 if *s1 is not a prefix 5229088Smarkm * of *s2. If *s1 exactly matches *s2, the negative of 5329088Smarkm * the length is returned. If *s1 is a prefix of *s2, 5429088Smarkm * the length of *s1 is returned. 5529088Smarkm */ 5681965Smarkmint 5787139Smarkmisprefix(char *s1, const char *s2) 5829088Smarkm{ 5929088Smarkm char *os1; 6081965Smarkm char c1, c2; 6129088Smarkm 6229088Smarkm if (*s1 == '\0') 6329088Smarkm return(-1); 6429088Smarkm os1 = s1; 6529088Smarkm c1 = *s1; 6629088Smarkm c2 = *s2; 6729088Smarkm while (LOWER(c1) == LOWER(c2)) { 6829088Smarkm if (c1 == '\0') 6929088Smarkm break; 7029088Smarkm c1 = *++s1; 7129088Smarkm c2 = *++s2; 7229088Smarkm } 7329088Smarkm return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1))); 7429088Smarkm} 7529088Smarkm 7629088Smarkmstatic char *ambiguous; /* special return value for command routines */ 7729088Smarkm 7881965Smarkmchar ** 7981965Smarkmgenget(char *name, char **table, int stlen) 8029088Smarkm{ 8181965Smarkm char **c, **found; 8281965Smarkm int n; 8329088Smarkm 8429088Smarkm if (name == 0) 8529088Smarkm return 0; 8629088Smarkm 8729088Smarkm found = 0; 8829088Smarkm for (c = table; *c != 0; c = (char **)((char *)c + stlen)) { 8929088Smarkm if ((n = isprefix(name, *c)) == 0) 9029088Smarkm continue; 9129088Smarkm if (n < 0) /* exact match */ 9229088Smarkm return(c); 9329088Smarkm if (found) 9429088Smarkm return(&ambiguous); 9529088Smarkm found = c; 9629088Smarkm } 9729088Smarkm return(found); 9829088Smarkm} 9929088Smarkm 10029088Smarkm/* 10129088Smarkm * Function call version of Ambiguous() 10229088Smarkm */ 10381965Smarkmint 10487139SmarkmAmbiguous(char **s) 10529088Smarkm{ 10687139Smarkm return(s == &ambiguous); 10729088Smarkm} 108