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Annotation of src/usr.bin/telnet/genget.c, Revision 1.4

1.4     ! guenther    1: /*     $OpenBSD: genget.c,v 1.3 2014/07/19 23:50:38 guenther 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>
1.3       guenther   35: #include "telnet_locl.h"
1.1       deraadt    36:
                     37: /*
                     38:  * The prefix function returns 0 if *s1 is not a prefix
                     39:  * of *s2.  If *s1 exactly matches *s2, the negative of
                     40:  * the length is returned.  If *s1 is a prefix of *s2,
                     41:  * the length of *s1 is returned.
                     42:  */
                     43: int
                     44: isprefix(char *s1, char *s2)
                     45: {
                     46:     char *os1;
                     47:     char c1, c2;
                     48:
                     49:     if (*s1 == '\0')
                     50:        return(-1);
                     51:     os1 = s1;
                     52:     c1 = *s1;
                     53:     c2 = *s2;
1.4     ! guenther   54:     while (tolower((unsigned char)c1) == tolower((unsigned char)c2)) {
1.1       deraadt    55:        if (c1 == '\0')
                     56:            break;
                     57:        c1 = *++s1;
                     58:        c2 = *++s2;
                     59:     }
                     60:     return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
                     61: }
                     62:
                     63: static char *ambiguous;                /* special return value for command routines */
                     64:
                     65: char **
                     66: genget(char *name, char **table, int stlen)
                     67:      /* name to match */
                     68:      /* name entry in table */
                     69:
                     70: {
                     71:     char **c, **found;
                     72:     int n;
                     73:
                     74:     if (name == 0)
                     75:        return 0;
                     76:
                     77:     found = 0;
                     78:     for (c = table; *c != 0; c = (char **)((char *)c + stlen)) {
                     79:        if ((n = isprefix(name, *c)) == 0)
                     80:            continue;
                     81:        if (n < 0)              /* exact match */
                     82:            return(c);
                     83:        if (found)
                     84:            return(&ambiguous);
                     85:        found = c;
                     86:     }
                     87:     return(found);
                     88: }
                     89:
                     90: /*
                     91:  * Function call version of Ambiguous()
                     92:  */
                     93: int
                     94: Ambiguous(void *s)
                     95: {
                     96:     return((char **)s == &ambiguous);
                     97: }