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greg |
1.1 |
/* Copyright (c) 1990 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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greg |
1.2 |
* Basic memory allocation w/o overhead.
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* Calls malloc(3) for big requests.
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greg |
1.1 |
*
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*/
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greg |
1.2 |
#define NULL 0
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greg |
1.1 |
#ifndef MBLKSIZ
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#define MBLKSIZ 16376 /* size of memory allocation block */
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#endif
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greg |
1.2 |
#define WASTEFRAC 4 /* don't waste more than this */
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greg |
1.1 |
#ifndef ALIGN
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#define ALIGN int /* type for alignment */
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#endif
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#define BYTES_WORD sizeof(ALIGN)
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char *
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bmalloc(n) /* allocate a block of n bytes, no refunds */
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register unsigned n;
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{
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greg |
1.2 |
extern char *malloc();
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greg |
1.1 |
static char *bpos = NULL;
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static unsigned nrem = 0;
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greg |
1.2 |
if (n > nrem && (n > MBLKSIZ || nrem > MBLKSIZ/WASTEFRAC))
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return(malloc(n)); /* too big */
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greg |
1.1 |
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n = (n+(BYTES_WORD-1))&~(BYTES_WORD-1); /* word align */
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if (n > nrem) {
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if ((bpos = malloc((unsigned)MBLKSIZ)) == NULL) {
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nrem = 0;
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return(NULL);
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}
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nrem = MBLKSIZ;
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}
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bpos += n;
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nrem -= n;
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return(bpos - n);
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}
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bfree(p, n) /* free random memory */
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char *p;
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unsigned n;
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{
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/* not implemented */
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}
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