1#include "shgetc.h"
2
3void __shlim(FILE *f, off_t lim)
4{
5	f->shlim = lim;
6	f->shcnt = f->rend - f->rpos;
7	if (lim && f->shcnt > lim)
8		f->shend = f->rpos + lim;
9	else
10		f->shend = f->rend;
11}
12
13int __shgetc(FILE *f)
14{
15	int c;
16	if (f->shlim && f->shcnt >= f->shlim || (c=__uflow(f)) < 0) {
17		f->shend = 0;
18		return EOF;
19	}
20	if (f->shlim && f->rend - f->rpos > f->shlim - f->shcnt - 1)
21		f->shend = f->rpos + (f->shlim - f->shcnt - 1);
22	else
23		f->shend = f->rend;
24	if (f->rend) f->shcnt += f->rend - f->rpos + 1;
25	if (f->rpos[-1] != c) f->rpos[-1] = c;
26	return c;
27}
28