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55 lines
2.1 KiB
C
55 lines
2.1 KiB
C
/***************************************************************************
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*
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* s b r k F u n c t i o n
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* -------------------------
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* Copyright 1982 by Digital Research Inc. All rights reserved.
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*
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* The "sbrk" function is used to allocate memory dynamically.
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*
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* Calling Sequence:
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*
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* addr = sbrk(incr);
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*
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* Where:
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* incr Is the incremental number of bytes to be added to
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* the program heap area.
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*
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* addr Is the beginning address of the allocated area.
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* -1 is returned if allocation failed
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*
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* Last modified:
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* 1/84 whf refresh include files for 68K (sbrk in asm for 8086)
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****************************************************************************/
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#include "portab.h"
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#include "osif.h"
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#include "osiferr.h"
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#include "errno.h"
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/****************************/
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EXTERN BYTE *_break; /* Old break address */
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/****************************/
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BYTE * sbrk(incr) /* CLEAR FUNCTION ***********/
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WORD incr; /* Incremental storage */
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/* */
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{ /****************************/
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REG BYTE *t1,*t2; /* Temporary */
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REG LONG inc; /* Temp size increment */
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inc = ((LONG)incr) & 0xffffL; /* Un sign-extend */
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if(inc & 1) /* Disallow odd incr's */
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inc++; /* Round up to next */
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/* */
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t1 = _break; /* Save the old break */
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t2 = _break + inc; /* New break value */
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/****************************/
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if(brk(t2) == FAILURE) /* Allocate */
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RETERR(FAILURE,ENOMEM); /* Can't */
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/****************************/
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blkfill(t1,NULL,incr); /* Initialize to 0's */
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return(t1); /* And return */
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} /****************************/
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incr); /* Initialize to 0's */
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return(t1); /* And return */
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} /****************************/
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incr); /* Initialize to 0's */
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return(t1); /* And return */
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} /****************************/
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