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* Greg Ward Lawrence Berkeley Laboratory |
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*/ |
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#include <errno.h> |
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|
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#define NULL 0 |
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#ifndef ALIGN |
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register int bucket; |
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register unsigned bsiz; |
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/* align pointer */ |
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< |
bsiz = BYTES_WORD - ((unsigned)p&~(BYTES_WORD-1)); |
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> |
bsiz = BYTES_WORD - ((unsigned)p&(BYTES_WORD-1)); |
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if (bsiz < BYTES_WORD) { |
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p += bsiz; |
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n -= bsiz; |
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malloc(n) /* allocate n bytes of memory */ |
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unsigned n; |
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{ |
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extern int errno; |
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register M_HEAD *mp; |
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register int bucket; |
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register unsigned bsiz; |
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– |
|
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– |
if (n == 0) |
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– |
return(NULL); |
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/* find first bucket that fits */ |
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< |
bucket = FIRSTBUCKET; |
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< |
for (bsiz = 1<<FIRSTBUCKET; bsiz < n; bsiz <<= 1) |
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< |
bucket++; |
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> |
for (bucket = FIRSTBUCKET, bsiz = 1<<FIRSTBUCKET; |
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> |
bucket < NBUCKETS; bucket++, bsiz <<= 1) |
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> |
if (bsiz >= n) |
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> |
break; |
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> |
if (bucket >= NBUCKETS) { |
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> |
errno = EINVAL; |
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> |
return(NULL); |
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> |
} |
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if (free_list[bucket] == NULL) { /* need more core */ |
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mp = (M_HEAD *)bmalloc(bsiz+sizeof(M_HEAD)); |
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if (mp == NULL) |
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|
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char * |
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realloc(op, n) /* reallocate memory using malloc() */ |
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< |
char *op; |
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> |
register char *op; |
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unsigned n; |
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{ |
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< |
extern char *memcpy(); |
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< |
register char *p; |
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> |
char *p; |
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register unsigned on; |
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< |
|
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< |
free(op); /* free it first */ |
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< |
p = malloc(n); /* p==op if same bucket */ |
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< |
if (p == NULL) |
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< |
return(NULL); |
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< |
if (p != op) /* different bucket, do copy */ |
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> |
/* get old size */ |
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> |
if (op != NULL) |
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> |
on = 1 << ((M_HEAD *)op-1)->bucket; |
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> |
else |
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> |
on = 0; |
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> |
if (n <= on && (n > on>>1 || on == 1<<FIRSTBUCKET)) |
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> |
return(op); /* same bucket */ |
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> |
p = malloc(n); |
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> |
if (p != NULL) |
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#ifdef BSD |
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bcopy(op, p, n>on ? on : n); |
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#else |
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(void)memcpy(p, op, n>on ? on : n); |
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#endif |
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+ |
free(op); |
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return(p); |
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} |
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