51 lines
923 B
C
51 lines
923 B
C
/*
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* setbuf.c - control buffering of a stream
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*/
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/* $Header$ */
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#include <stdio.h>
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#include <stdlib.h>
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#include "loc_incl.h"
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extern void (*_clean)(void);
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int
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setvbuf(register FILE *stream, char *buf, int mode, size_t size)
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{
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int retval = 0;
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_clean = __cleanup;
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if (mode != _IOFBF && mode != _IOLBF && mode != _IONBF)
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return EOF;
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if (stream->_buf && io_testflag(stream,_IOMYBUF) )
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free((void *)stream->_buf);
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stream->_flags &= ~(_IOMYBUF | _IONBF | _IOLBF);
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if (!buf && (mode != _IONBF)) {
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if ((buf = (char *) malloc(size)) == NULL) {
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retval = EOF;
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} else {
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stream->_flags |= _IOMYBUF;
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}
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}
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if (io_testflag(stream, _IOREADING) || io_testflag(stream, _IOWRITING))
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retval = EOF;
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stream->_buf = (unsigned char *) buf;
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stream->_count = 0;
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stream->_flags |= mode;
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stream->_ptr = stream->_buf;
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if (!buf) {
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stream->_bufsiz = 1;
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} else {
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stream->_bufsiz = size;
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}
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return retval;
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}
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