88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Hans van Staveren
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "param.h"
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#include "types.h"
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#include "tes.h"
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#include "lookup.h"
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#include "alloc.h"
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#include "proinf.h"
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#include "util.h"
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unsigned hash(char *string)
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{
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register char *p;
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register unsigned i, sum;
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for (sum = i = 0, p = string; *p; i += 3)
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sum ^= (*p++) << (i & 07);
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return (sum);
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}
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sym_p symlookup(char *name, int status, int flags)
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{
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register sym_p *spp, sp;
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register int i;
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static short genfrag = 32767;
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spp = &symhash[hash(name) % NSYMHASH];
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while (*spp != (sym_p) 0)
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if (strncmp((*spp)->s_name, name, IDL) == 0)
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{
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sp = *spp;
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if ((sp->s_flags ^ flags) & SYMPRO)
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error("%s is both proc and datalabel", name);
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if (status == DEFINING)
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{
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if (sp->s_flags & SYMDEF)
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error("redefined symbol %s", name);
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sp->s_flags |= SYMDEF;
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}
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return (sp);
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}
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else
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spp = &(*spp)->s_next;
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/*
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* symbol not found, enter in table
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*/
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i = strlen(name) + 1;
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if (i & 1)
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i++;
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if (i > IDL)
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i = IDL;
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*spp = sp = newsym(i);
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strncpy(sp->s_name, name, i);
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sp->s_flags = flags;
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if (status == DEFINING)
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sp->s_flags |= SYMDEF;
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sp->s_frag = genfrag--;
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return (sp);
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}
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num_p numlookup(unsigned number)
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{
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register num_p *npp, np;
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npp = &curpro.numhash[number % NNUMHASH];
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while (*npp != (num_p) 0)
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if ((*npp)->n_number == number)
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return (*npp);
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else
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npp = &(*npp)->n_next;
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/*
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* local label not found, enter in tabel
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*/
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*npp = np = newnum();
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np->n_number = number;
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np->n_repl = np;
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return (np);
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}
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