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Annotation of src/usr.bin/telnet/genget.c, Revision 1.2

1.2     ! deraadt     1: /*     $OpenBSD: genget.c,v 1.1 2005/05/24 03:43:56 deraadt Exp $  */
1.1       deraadt     2:
                      3: /*-
                      4:  * Copyright (c) 1991, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the University nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
                     32: /* $KTH: genget.c,v 1.6 1997/05/04 09:01:34 assar Exp $ */
                     33:
                     34: #include <ctype.h>
                     35: #include "misc-proto.h"
                     36:
                     37: #define        LOWER(x) (isupper((int)x) ? tolower((int)x) : (x))
                     38: /*
                     39:  * The prefix function returns 0 if *s1 is not a prefix
                     40:  * of *s2.  If *s1 exactly matches *s2, the negative of
                     41:  * the length is returned.  If *s1 is a prefix of *s2,
                     42:  * the length of *s1 is returned.
                     43:  */
                     44: int
                     45: isprefix(char *s1, char *s2)
                     46: {
                     47:     char *os1;
                     48:     char c1, c2;
                     49:
                     50:     if (*s1 == '\0')
                     51:        return(-1);
                     52:     os1 = s1;
                     53:     c1 = *s1;
                     54:     c2 = *s2;
                     55:     while (LOWER(c1) == LOWER(c2)) {
                     56:        if (c1 == '\0')
                     57:            break;
                     58:        c1 = *++s1;
                     59:        c2 = *++s2;
                     60:     }
                     61:     return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
                     62: }
                     63:
                     64: static char *ambiguous;                /* special return value for command routines */
                     65:
                     66: char **
                     67: genget(char *name, char **table, int stlen)
                     68:      /* name to match */
                     69:      /* name entry in table */
                     70:
                     71: {
                     72:     char **c, **found;
                     73:     int n;
                     74:
                     75:     if (name == 0)
                     76:        return 0;
                     77:
                     78:     found = 0;
                     79:     for (c = table; *c != 0; c = (char **)((char *)c + stlen)) {
                     80:        if ((n = isprefix(name, *c)) == 0)
                     81:            continue;
                     82:        if (n < 0)              /* exact match */
                     83:            return(c);
                     84:        if (found)
                     85:            return(&ambiguous);
                     86:        found = c;
                     87:     }
                     88:     return(found);
                     89: }
                     90:
                     91: /*
                     92:  * Function call version of Ambiguous()
                     93:  */
                     94: int
                     95: Ambiguous(void *s)
                     96: {
                     97:     return((char **)s == &ambiguous);
                     98: }