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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/stdio/stdio.h"
#include "libc/str/thompike.h"
#include "libc/str/tpdecodecb.internal.h"
/**
* Reads UTF-8 character from stream.
* @return wide character or -1 on EOF or error
*/
wint_t fgetwc(FILE *f) {
int c, n;
wint_t b, x, y;
if (f->beg < f->end) {
b = f->buf[f->beg++] & 0xff;
} else if ((c = fgetc(f)) != -1) {
b = c;
} else {
return -1;
}
if (b < 0300) return b;
n = ThomPikeLen(b);
x = ThomPikeByte(b);
while (--n) {
if ((c = fgetc(f)) == -1) return -1;
y = c;
if (ThomPikeCont(y)) {
x = ThomPikeMerge(x, y);
} else {
ungetc(y, f);
return b;
}
}
return x;
}
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