X-Git-Url: https://git.deb.at/w?a=blobdiff_plain;f=xmalloc.c;h=d291f4dd76149b86679cb29e51691ca0fb72cbc6;hb=9fdb9852aeafd99361725c0432ad69110f24a1be;hp=086f3fbb69ed9b5fe351a9078af9e75d29abf80a;hpb=7a7531e544d236d58ca077ce56b7d6d0c60faa09;p=pkg%2Fabook.git

diff --git a/xmalloc.c b/xmalloc.c
index 086f3fb..d291f4d 100644
--- a/xmalloc.c
+++ b/xmalloc.c
@@ -36,6 +36,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include "xmalloc.h"
 
 static void
 xmalloc_default_error_handler(int err)
@@ -78,22 +79,6 @@ xmalloc0(size_t size)
 	return p;
 }
 
-void *
-xrealloc(void *ptr, size_t size)
-{
-	if((ptr = realloc(ptr, size)) == NULL)
-		(*xmalloc_handle_error)(errno);
-
-	return ptr;
-}
-
-void
-xfree(void *ptr)
-{
-	free(ptr);
-	ptr = NULL;
-}
-
 static void *
 _xmalloc_inc(size_t size, size_t inc, int zero)
 {
@@ -122,3 +107,31 @@ xmalloc0_inc(size_t size, size_t inc)
 	return _xmalloc_inc(size, inc, 1);
 }
 
+void *
+xrealloc(void *ptr, size_t size)
+{
+	if((ptr = realloc(ptr, size)) == NULL)
+		(*xmalloc_handle_error)(errno);
+
+	return ptr;
+}
+
+void *
+xrealloc_inc(void *ptr, size_t size, size_t inc)
+{
+	size_t total_size = size + inc;
+
+	/*
+	 * check if the calculation overflowed
+	 */
+	if(total_size < size) {
+		(*xmalloc_handle_error)(EINVAL);
+		return NULL;
+	}
+
+	if((ptr = realloc(ptr, total_size)) == NULL)
+		(*xmalloc_handle_error)(errno);
+
+	return ptr;
+}
+