36 lines
633 B
C
36 lines
633 B
C
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#include "stdio_impl.h"
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#include "locale_impl.h"
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#include <wchar.h>
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#include <limits.h>
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#include <ctype.h>
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#include <string.h>
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wint_t ungetwc(wint_t c, FILE *f)
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{
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unsigned char mbc[MB_LEN_MAX];
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int l;
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locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
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FLOCK(f);
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if (f->mode <= 0) fwide(f, 1);
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*ploc = f->locale;
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if (!f->rpos) __toread(f);
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if (!f->rpos || c == WEOF || (l = wcrtomb((void *)mbc, c, 0)) < 0 ||
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f->rpos < f->buf - UNGET + l) {
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FUNLOCK(f);
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*ploc = loc;
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return WEOF;
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}
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if (isascii(c)) *--f->rpos = c;
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else memcpy(f->rpos -= l, mbc, l);
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f->flags &= ~F_EOF;
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FUNLOCK(f);
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*ploc = loc;
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return c;
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}
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