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#include "stdio_impl.h"
/* The behavior of this function is undefined except when it is the first
* operation on the stream, so the presence or absence of locking is not
* observable in a program whose behavior is defined. Thus no locking is
* performed here. No allocation of buffers is performed, but a buffer
* provided by the caller is used as long as it is suitably sized. */
int setvbuf(FILE *restrict f, char *restrict buf, int type, size_t size)
{
f->lbf = EOF;
if (type == _IONBF) {
f->buf_size = 0;
} else if (type == _IOLBF || type == _IOFBF) {
if (buf && size >= UNGET) {
f->buf = (void *)(buf + UNGET);
f->buf_size = size - UNGET;
}
if (type == _IOLBF && f->buf_size)
f->lbf = '\n';
} else {
return -1;
}
f->flags |= F_SVB;
return 0;
}
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