43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
#include "libc/str/str.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
#include "third_party/dlmalloc/dlmalloc.internal.h"
|
|
|
|
void *dlrealloc(void *oldmem, size_t bytes) {
|
|
void *mem = 0;
|
|
if (oldmem == 0) {
|
|
mem = dlmalloc(bytes);
|
|
} else if (bytes >= MAX_REQUEST) {
|
|
enomem();
|
|
} else if (bytes == 0) {
|
|
dlfree(oldmem);
|
|
} else {
|
|
size_t nb = request2size(bytes);
|
|
mchunkptr oldp = mem2chunk(oldmem);
|
|
#if !FOOTERS
|
|
mstate m = g_dlmalloc;
|
|
#else /* FOOTERS */
|
|
mstate m = get_mstate_for(oldp);
|
|
if (!ok_magic(m)) {
|
|
USAGE_ERROR_ACTION(m, oldmem);
|
|
return 0;
|
|
}
|
|
#endif /* FOOTERS */
|
|
if (!PREACTION(m)) {
|
|
mchunkptr newp = dlmalloc_try_realloc_chunk(m, oldp, nb, 1);
|
|
POSTACTION(m);
|
|
if (newp != 0) {
|
|
check_inuse_chunk(m, newp);
|
|
mem = chunk2mem(newp);
|
|
} else {
|
|
mem = dlmalloc(bytes);
|
|
if (mem != 0) {
|
|
size_t oc = chunksize(oldp) - overhead_for(oldp);
|
|
memcpy(mem, oldmem, (oc < bytes) ? oc : bytes);
|
|
dlfree(oldmem);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return mem;
|
|
}
|