perf tools: Add reallocarray_as_needed()

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>

1 files changed, 33 insertions, 0 deletions

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 9b02edf9311d..391c1e928bd7 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -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;
+}