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