/*- * Copyright (c) 1980, 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[] = "@(#)lookup.c 8.1 (Berkeley) 6/6/93"; #endif /* not lint */ #include "whoami.h" #include "0.h" struct nl *disptab[077+1]; /* * Lookup is called to * find a symbol in the * block structure symbol * table and returns a pointer to * its namelist entry. */ struct nl * lookup(s) register char *s; { register struct nl *p; register struct udinfo; if (s == NIL) { nocascade(); return (NLNIL); } p = lookup1(s); if (p == NLNIL) { derror("%s is undefined", s); return (NLNIL); } if (p->class == FVAR) { p = p->chain; bn--; } return (p); } #ifndef PI0 int flagwas; #endif /* * Lookup1 is an internal lookup. * It is not an error to call lookup1 * if the symbol is not defined. Also * lookup1 will return FVARs while * lookup never will, thus asgnop * calls it when it thinks you are * assigning to the function variable. */ struct nl * lookup1(s) register char *s; { register struct nl *p; #ifndef PI0 register struct nl *q; #endif register int i; if (s == NIL) return (NLNIL); bn = cbn; #ifndef PI0 /* * We first check the field names * of the currently active with * statements (expensive since they * are not hashed). */ for (p = withlist; p != NLNIL; p = p->nl_next) { q = p->type; if (q == NLNIL) continue; if (reclook(q, s) != NIL) /* * Return the WITHPTR, lvalue understands. */ return (p); } #endif /* * Symbol table is a 64 way hash * on the low bits of the character * pointer value. (Simple, but effective) */ i = (int) s & 077; for (p = disptab[i]; p != NLNIL; p = p->nl_next) if (p->symbol == s && p->class != FIELD && p->class != BADUSE) { bn = (p->nl_block & 037); #ifndef PI0 flagwas = p->nl_flags; p->nl_flags |= NUSED; #endif return (p); } return (NLNIL); } #ifndef PI01 nlfund(sp) char *sp; { register struct nl *p; register int i; i = (int) sp & 077; for (p = disptab[i]; p != NLNIL; p = p->nl_next) if (p->symbol == sp && (p->nl_block & 037) == 0) return (nloff(p)); return (0); } #endif