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Annotation of src/lib/libtelnet/genget.c, Revision 1.12

1.12    ! christos    1: /*     $NetBSD: genget.c,v 1.11 2004/10/28 21:14:52 dsl Exp $  */
1.7       christos    2:
1.1       cgd         3: /*-
1.3       cgd         4:  * Copyright (c) 1991, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         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.
1.9       agc        15:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        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:
1.6       lukem      32: #include <sys/cdefs.h>
1.1       cgd        33: #ifndef lint
1.6       lukem      34: #if 0
                     35: static char sccsid[] = "@(#)genget.c   8.2 (Berkeley) 5/30/95";
                     36: #else
1.12    ! christos   37: __RCSID("$NetBSD: genget.c,v 1.11 2004/10/28 21:14:52 dsl Exp $");
1.6       lukem      38: #endif
1.1       cgd        39: #endif /* not lint */
                     40:
1.5       jtk        41:
1.4       pk         42: #include <ctype.h>
1.7       christos   43: #include "misc.h"
1.1       cgd        44:
1.11      dsl        45: #define        LOWER(x) (isupper((unsigned char)x) ? tolower((unsigned char)x) : (x))
1.1       cgd        46: /*
                     47:  * The prefix function returns 0 if *s1 is not a prefix
                     48:  * of *s2.  If *s1 exactly matches *s2, the negative of
                     49:  * the length is returned.  If *s1 is a prefix of *s2,
                     50:  * the length of *s1 is returned.
                     51:  */
                     52:        int
1.12    ! christos   53: isprefix(char *s1, const char *s2)
1.1       cgd        54: {
1.4       pk         55:        char *os1;
1.12    ! christos   56:        char c1, c2;
1.1       cgd        57:
1.5       jtk        58:        if (*s1 == '\0')
                     59:                return(-1);
                     60:        os1 = s1;
1.1       cgd        61:        c1 = *s1;
                     62:        c2 = *s2;
1.5       jtk        63:        while (LOWER(c1) == LOWER(c2)) {
1.1       cgd        64:                if (c1 == '\0')
                     65:                        break;
1.5       jtk        66:                c1 = *++s1;
                     67:                c2 = *++s2;
                     68:        }
                     69:        return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1)));
1.1       cgd        70: }
                     71:
                     72: static char *ambiguous;                /* special return value for command routines */
                     73:
                     74:        char **
                     75: genget(name, table, stlen)
                     76:        char    *name;          /* name to match */
                     77:        char    **table;        /* name entry in table */
                     78:        int     stlen;
                     79: {
                     80:        register char **c, **found;
                     81:        register 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(s)
1.7       christos  104:        void *s;
1.1       cgd       105: {
1.7       christos  106:        return(s == &ambiguous);
1.1       cgd       107: }