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 <config.h> 35 #ifdef HAVE_SYS_TYPES_H 36 #include <sys/types.h> 37 #endif 38 #include <ctype.h> 39 #include "misc-proto.h" 40 41 RCSID("$Id$"); 42 43 44 #define LOWER(x) (isupper(x) ? tolower(x) : (x)) 45 /* 46 * The prefix function returns 0 if *s1 is not a prefix 47 * of *s2. If *s1 exactly matches *s2, the negative of 48 * the length is returned. If *s1 is a prefix of *s2, 49 * the length of *s1 is returned. 50 */ 51 52 int 53 isprefix(char *s1, char *s2) 54 { 55 char *os1; 56 char c1, c2; 57 58 if (*s1 == '\0') 59 return(-1); 60 os1 = s1; 61 c1 = *s1; 62 c2 = *s2; 63 while (tolower((unsigned char)c1) == tolower((unsigned char)c2)) { 64 if (c1 == '\0') 65 break; 66 c1 = *++s1; 67 c2 = *++s2; 68 } 69 return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1))); 70 } 71 72 static char *ambiguous; /* special return value for command routines */ 73 74 char ** 75 genget(char *name, char **table, int stlen) 76 /* name to match */ 77 /* name entry in table */ 78 79 { 80 char **c, **found; 81 int n; 82 83 if (name == 0) 84 return 0; 85 86 found = 0; 87 for (c = table; *c != 0; c = (char **)((char *)c + stlen)) { 88 if ((n = isprefix(name, *c)) == 0) 89 continue; 90 if (n < 0) /* exact match */ 91 return(c); 92 if (found) 93 return(&ambiguous); 94 found = c; 95 } 96 return(found); 97 } 98 99 /* 100 * Function call version of Ambiguous() 101 */ 102 int 103 Ambiguous(void *s) 104 { 105 return((char **)s == &ambiguous); 106 } 107