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perf tools: Add reallocarray_as_needed()

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Add helper reallocarray_as_needed() to reallocate an array to a larger
size and initialize the extra entries to an arbitrary value.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-24-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
2022-07-11 12:32:06 +03:00
committed by Arnaldo Carvalho de Melo
parent a5367ecb53
commit 10d3470022
2 changed files with 48 additions and 0 deletions
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33
tools/perf/util/util.c
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@ -18,6 +18,7 @@
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/time64.h>
#include <linux/overflow.h>
#include <unistd.h>
#include "cap.h"
#include "strlist.h"
@ -500,3 +501,35 @@ char *filename_with_chroot(int pid, const char *filename)
return new_name;
}
/*
* Reallocate an array *arr of size *arr_sz so that it is big enough to contain
* x elements of size msz, initializing new entries to *init_val or zero if
* init_val is NULL
*/
int do_realloc_array_as_needed(void **arr, size_t *arr_sz, size_t x, size_t msz, const void *init_val)
{
size_t new_sz = *arr_sz;
void *new_arr;
size_t i;
if (!new_sz)
new_sz = msz >= 64 ? 1 : roundup(64, msz); /* Start with at least 64 bytes */
while (x >= new_sz) {
if (check_mul_overflow(new_sz, (size_t)2, &new_sz))
return -ENOMEM;
}
if (new_sz == *arr_sz)
return 0;
new_arr = calloc(new_sz, msz);
if (!new_arr)
return -ENOMEM;
memcpy(new_arr, *arr, *arr_sz * msz);
if (init_val) {
for (i = *arr_sz; i < new_sz; i++)
memcpy(new_arr + (i * msz), init_val, msz);
}
*arr = new_arr;
*arr_sz = new_sz;
return 0;
}