101 lines
1.7 KiB
C
101 lines
1.7 KiB
C
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/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include "rc.h"
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#include "exec.h"
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#include "fns.h"
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unsigned
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hash(char *as, int n)
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{
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int i = 1;
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unsigned h = 0;
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uint8_t *s;
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s = (uint8_t *)as;
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while (*s)
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h += *s++ * i++;
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return h % n;
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}
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#define NKW 30
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struct kw{
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char *name;
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int type;
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struct kw *next;
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}*kw[NKW];
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void
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kenter(int type, char *name)
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{
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int h = hash(name, NKW);
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struct kw *p = new(struct kw);
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p->type = type;
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p->name = name;
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p->next = kw[h];
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kw[h] = p;
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}
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void
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kinit(void)
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{
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kenter(FOR, "for");
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kenter(IN, "in");
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kenter(WHILE, "while");
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kenter(IF, "if");
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kenter(NOT, "not");
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kenter(TWIDDLE, "~");
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kenter(BANG, "!");
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kenter(SUBSHELL, "@");
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kenter(SWITCH, "switch");
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kenter(FN, "fn");
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}
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tree*
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klook(char *name)
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{
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struct kw *p;
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tree *t = token(name, WORD);
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for(p = kw[hash(name, NKW)];p;p = p->next)
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if(strcmp(p->name, name)==0){
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t->type = p->type;
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t->iskw = 1;
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break;
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}
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return t;
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}
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var*
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gvlook(char *name)
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{
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int h = hash(name, NVAR);
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var *v;
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for(v = gvar[h];v;v = v->next) if(strcmp(v->name, name)==0) return v;
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return gvar[h] = newvar(strdup(name), gvar[h]);
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}
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var*
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vlook(char *name)
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{
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var *v;
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if(runq)
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for(v = runq->local;v;v = v->next)
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if(strcmp(v->name, name)==0) return v;
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return gvlook(name);
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}
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void
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setvar(char *name, word *val)
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{
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struct var *v = vlook(name);
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freewords(v->val);
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v->val = val;
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v->changed = 1;
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}
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