first commit

zmalloc.c

@@ -0,0 +1,82 @@
+/* zmalloc - total amount of allocated memory aware version of malloc()
+ *
+ * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+static size_t used_memory = 0;
+
+void *zmalloc(size_t size) {
+    void *ptr = malloc(size+sizeof(size_t));
+
+    *((size_t*)ptr) = size;
+    used_memory += size+sizeof(size_t);
+    return ptr+sizeof(size_t);
+}
+
+void *zrealloc(void *ptr, size_t size) {
+    void *realptr;
+    size_t oldsize;
+    void *newptr;
+
+    if (ptr == NULL) return zmalloc(size);
+    realptr = ptr-sizeof(size_t);
+    oldsize = *((size_t*)realptr);
+    newptr = realloc(realptr,size+sizeof(size_t));
+    if (!newptr) return NULL;
+
+    *((size_t*)newptr) = size;
+    used_memory -= oldsize;
+    used_memory += size;
+    return newptr+sizeof(size_t);
+}
+
+void zfree(void *ptr) {
+    void *realptr;
+    size_t oldsize;
+
+    if (ptr == NULL) return;
+    realptr = ptr-sizeof(size_t);
+    oldsize = *((size_t*)realptr);
+    used_memory -= oldsize+sizeof(size_t);
+    free(realptr);
+}
+
+char *zstrdup(const char *s) {
+    size_t l = strlen(s)+1;
+    char *p = zmalloc(l);
+
+    memcpy(p,s,l);
+    return p;
+}
+
+size_t zmalloc_used_memory(void) {
+    return used_memory;
+}