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#include "stdio_impl.h"
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wint_t ungetwc(wint_t c, FILE *f)
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unsigned char mbc[MB_LEN_MAX];
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if (c == WEOF) return c;
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/* Try conversion early so we can fail without locking if invalid */
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if (!isascii(c) && (l = wctomb((void *)mbc, c)) < 0)
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if ((!f->rend && __toread(f)) || f->rpos < f->buf - UNGET + l) {
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if (isascii(c)) *--f->rpos = c;
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else memcpy(f->rpos -= l, mbc, l);