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setvbuf: return failure if mode is invalid
POSIX requires setvbuf to return non-zero if `mode` is not one of _IONBF, _IOLBF, or _IOFBF.
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@ -12,13 +12,15 @@ int setvbuf(FILE *restrict f, char *restrict buf, int type, size_t size)
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if (type == _IONBF) {
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f->buf_size = 0;
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} else {
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} else if (type == _IOLBF || type == _IOFBF) {
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if (buf && size >= UNGET) {
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f->buf = (void *)(buf + UNGET);
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f->buf_size = size - UNGET;
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}
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if (type == _IOLBF && f->buf_size)
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f->lbf = '\n';
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} else {
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return -1;
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}
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f->flags |= F_SVB;
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