File:  [Research Unix] / researchv8dc / cmd / cfront / libC / stream / streambuf.c
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:21:59 2018 UTC (8 years, 3 months ago) by root
Branches: belllabs, MAIN
CVS tags: researchv8, HEAD
researchv8 Dan Cross

#include "stream.h"

/*
	Allocate some space for the buffer.
	Returns:	EOF on error
			0 on success
*/
int streambuf.allocate()
{
	if (base == NULL) {
		if ((base = new char[BUFSIZE]) != NULL) {
			pptr = gptr = base;
			eptr = base + BUFSIZE;
			alloc = 1;
			return 0;
		} else
			return EOF;
	}
	return 0;
}

/*
	Come here on a put to a full buffer.  Allocate the buffer if 
	it is uninitialized.
	Returns:	EOF on error
			the argument on success
*/
virtual int streambuf.overflow(int c)
{
	if (allocate() == EOF) return EOF;
	if (c != EOF) *pptr++ = c;
	return c&0377;
}

/*
	Fill a buffer.
	Returns:	EOF on error or end of input
			next character on success
*/
virtual int streambuf.underflow()
{
	return EOF;
}

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