1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 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. 32 */ 33 34#include <sys/cdefs.h> 35 36#ifdef __FBSDID 37__FBSDID("$FreeBSD: src/crypto/telnet/libtelnet/genget.c,v 1.2.8.2 2002/04/13 10:59:07 markm Exp $"); 38#endif 39 40#ifndef lint 41#if 0 42static const char sccsid[] = "@(#)genget.c 8.2 (Berkeley) 5/30/95"; 43#endif 44#endif /* not lint */ 45 46 47#include <ctype.h> 48 49#include "misc-proto.h" 50 51#define LOWER(x) (isupper(x) ? tolower(x) : (x)) 52/* 53 * The prefix function returns 0 if *s1 is not a prefix 54 * of *s2. If *s1 exactly matches *s2, the negative of 55 * the length is returned. If *s1 is a prefix of *s2, 56 * the length of *s1 is returned. 57 */ 58int 59isprefix(char *s1, const char *s2) 60{ 61 char *os1; 62 char c1, c2; 63 64 if (*s1 == '\0') 65 return(-1); 66 os1 = s1; 67 c1 = *s1; 68 c2 = *s2; 69 while (LOWER(c1) == LOWER(c2)) { 70 if (c1 == '\0') 71 break; 72 c1 = *++s1; 73 c2 = *++s2; 74 } 75 return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1))); 76} 77 78static char *ambiguous; /* special return value for command routines */ 79 80char ** 81genget(char *name, char **table, int stlen) 82{ 83 char **c, **found; 84 int n; 85 86 if (name == 0) 87 return 0; 88 89 found = 0; 90 for (c = table; *c != 0; c = (char **)((char *)c + stlen)) { 91 if ((n = isprefix(name, *c)) == 0) 92 continue; 93 if (n < 0) /* exact match */ 94 return(c); 95 if (found) 96 return(&ambiguous); 97 found = c; 98 } 99 return(found); 100} 101 102/* 103 * Function call version of Ambiguous() 104 */ 105int 106Ambiguous(char **s) 107{ 108 return(s == &ambiguous); 109} 110