From: David Herrmann <dh.herrmann@gmail.com>
Date: Tue, 5 Mar 2013 00:21:29 +0000 (+0100)
Subject: shl: array: add shl_array_zresize()
X-Git-Tag: kmscon-8~61
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b8f58fea9caed09cfbceea713389a93b02d59d42;p=platform%2Fupstream%2Fkmscon.git

shl: array: add shl_array_zresize()

This helper resizes the array to a given length and zeroes out all new
elements.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
---

diff --git a/src/shl_array.h b/src/shl_array.h
index e108ca3..9daf409 100644
--- a/src/shl_array.h
+++ b/src/shl_array.h
@@ -35,6 +35,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include "shl_misc.h"
 
 struct shl_array {
 	size_t element_size;
@@ -84,6 +85,32 @@ static inline void shl_array_free(struct shl_array *arr)
 	free(arr);
 }
 
+/* resize to length=size and zero out new array entries */
+static inline int shl_array_zresize(struct shl_array *arr, size_t size)
+{
+	void *tmp;
+	size_t newsize;
+
+	if (!arr)
+		return -EINVAL;
+
+	if (size > arr->size) {
+		newsize = shl_next_pow2(size);
+		tmp = realloc(arr->data, arr->element_size * newsize);
+		if (!tmp)
+			return -ENOMEM;
+
+		arr->data = tmp;
+		arr->size = newsize;
+
+		memset(((uint8_t*)arr->data) + arr->element_size * arr->length,
+		       0, arr->element_size * (size - arr->length));
+	}
+
+	arr->length = size;
+	return 0;
+}
+
 static inline int shl_array_push(struct shl_array *arr, const void *data)
 {
 	void *tmp;