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[/] [or1k/] [trunk/] [uclinux/] [userland/] [telnet/] [genget.c] - Rev 1765
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/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char sccsid[] = "@(#)genget.c 8.1 (Berkeley) 6/4/93"; #endif /* not lint */ #include <ctype.h> #define LOWER(x) (isupper(x) ? tolower(x) : (x)) /* * The prefix function returns 0 if *s1 is not a prefix * of *s2. If *s1 exactly matches *s2, the negative of * the length is returned. If *s1 is a prefix of *s2, * the length of *s1 is returned. */ int isprefix(s1, s2) register char *s1, *s2; { char *os1; register char c1, c2; if (*s1 == '\0') return(-1); os1 = s1; c1 = *s1; c2 = *s2; while (LOWER(c1) == LOWER(c2)) { if (c1 == '\0') break; c1 = *++s1; c2 = *++s2; } return(*s1 ? 0 : (*s2 ? (s1 - os1) : (os1 - s1))); } static char *ambiguous; /* special return value for command routines */ char ** genget(name, table, stlen) char *name; /* name to match */ char **table; /* name entry in table */ int stlen; { register char **c, **found; register int n; if (name == 0) return 0; found = 0; for (c = table; *c != 0; c = (char **)((char *)c + stlen)) { if ((n = isprefix(name, *c)) == 0) continue; if (n < 0) /* exact match */ return(c); if (found) return(&ambiguous); found = c; } return(found); } /* * Function call version of Ambiguous() */ int Ambiguous(s) char *s; { return((char **)s == &ambiguous); }