added xfree() which takes a const pointer

Unfortunately, the C standard postulates that the argument to free() must be non-const. This does not makes sense, and virtually prevents every pointer which must be freed at some time to be non-const. Use the deconst hack (sorry for that) to allow us to free constant pointers.

added xfree() which takes a const pointer
f42de62a · Max Kellermann · 8811c0e0 · f42de62a
Commit f42de62a authored Aug 29, 2008 by Max Kellermann
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utils.h src/utils.h +13 -0

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--- a/src/utils.h
+++ b/src/utils.h
@@ -76,6 +76,19 @@ mpd_malloc void *xrealloc(void *ptr, size_t size);

 mpd_malloc void *xcalloc(size_t nmemb, size_t size);

+/**
+ * free a const pointer - unfortunately free() expects a non-const
+ * pointer, for whatever reason
+ */
+static inline void xfree(const void *p)
+{
+	union {
+		const void *in;
+		void *out;
+	} deconst = { .in = p };
+	free(deconst.out);
+}
+
 char *parsePath(char *path);

 int set_nonblocking(int fd);