V7/usr/src/cmd/sh/setbrk.c

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including files from this version of Unix. 
#
/*
 *	UNIX shell
 *
 *	S. R. Bourne
 *	Bell Telephone Laboratories
 *
 */

#include	"defs.h"

setbrk(incr)
{
	REG BYTPTR	a=sbrk(incr);
	brkend=a+incr;
	return(a);
}