111 lines
1.9 KiB
C
111 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cpp.h"
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/*
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* A hideset is a null-terminated array of Nlist pointers.
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* They are referred to by indices in the hidesets array.
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* Hideset 0 is empty.
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*/
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#define HSSIZ 32
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typedef Nlist **Hideset;
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Hideset *hidesets;
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int nhidesets = 0;
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int maxhidesets = 3;
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int inserths(Hideset, Hideset, Nlist *);
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/*
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* Test for membership in a hideset
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*/
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int
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checkhideset(int hs, Nlist *np)
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{
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Hideset hsp;
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if (hs>=nhidesets)
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abort();
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for (hsp = hidesets[hs]; *hsp; hsp++) {
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if (*hsp == np)
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return 1;
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}
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return 0;
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}
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/*
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* Return the (possibly new) hideset obtained by adding np to hs.
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*/
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int
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newhideset(int hs, Nlist *np)
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{
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int i, len;
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Nlist *nhs[HSSIZ+3];
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Hideset hs1, hs2;
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len = inserths(nhs, hidesets[hs], np);
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for (i=0; i<nhidesets; i++) {
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for (hs1=nhs, hs2=hidesets[i]; *hs1==*hs2; hs1++, hs2++)
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if (*hs1 == NULL)
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return i;
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}
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if (len>=HSSIZ)
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return hs;
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if (nhidesets >= maxhidesets) {
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maxhidesets = 3*maxhidesets/2+1;
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hidesets = (Hideset *)dorealloc(hidesets, (sizeof (Hideset *))*maxhidesets);
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}
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hs1 = (Hideset)domalloc(len*sizeof *hs1);
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memmove(hs1, nhs, len*sizeof *hs1);
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hidesets[nhidesets] = hs1;
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return nhidesets++;
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}
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int
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inserths(Hideset dhs, Hideset shs, Nlist *np)
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{
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Hideset odhs = dhs;
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while (*shs && *shs < np)
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*dhs++ = *shs++;
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if (*shs != np)
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*dhs++ = np;
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do {
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*dhs++ = *shs;
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} while (*shs++);
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return dhs - odhs;
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}
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/*
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* Hideset union
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*/
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int
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unionhideset(int hs1, int hs2)
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{
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Hideset hp;
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for (hp = hidesets[hs2]; *hp; hp++)
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hs1 = newhideset(hs1, *hp);
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return hs1;
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}
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void
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iniths(void)
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{
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hidesets = (Hideset *)domalloc(maxhidesets*sizeof(Hideset *));
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hidesets[0] = (Hideset)domalloc(sizeof *hidesets[0]);
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*hidesets[0] = NULL;
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nhidesets++;
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}
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void
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prhideset(int hs)
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{
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Hideset np;
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for (np = hidesets[hs]; *np; np++) {
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fprintf(stderr, (char*)(*np)->name, (*np)->len);
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fprintf(stderr, " ");
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}
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}
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