Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/src/grepfold/fold.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


#include "grep.h"
#include "utffold.h"

static Rune*
bsearch(Rune c, Rune *t, int n, int ne)
{
	Rune *p;
	int m;

	while(n > 1) {
		m = n/2;
		p = t + m*ne;
		if(c >= p[0]) {
			t = p;
			n = n-m;
		} else
			n = m;
	}
	if(n && c >= t[0])
		return t;
	return 0;
}

Rune
tobaserune(Rune c)
{
	Rune *p;

	p = bsearch(c, __base2, nelem(__base2)/2, 2);
	if(p && *p == c)
		c = p[1];
	return c;
}

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