X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fmacros.h;h=28c21d5b8188ebd786d710cba5c1ceba8132154e;hp=1771d236c2daa3eeea5a807bef5ddc83cbb6d677;hb=2d1318e441e7a09bf01f9206c651831911ce7e89;hpb=54c90d10655e559818665234f29d5d01c8640ee7

diff --git a/src/common/macros.h b/src/common/macros.h
index 1771d236c..28c21d5b8 100644
--- a/src/common/macros.h
+++ b/src/common/macros.h
@@ -20,6 +20,9 @@
 #define _MACROS_H
 
 #include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <common/compat/string.h>
 
 /*
  * Takes a pointer x and transform it so we can use it to access members
@@ -46,16 +49,32 @@
 /*
  * Memory allocation zeroed
  */
-#define zmalloc(x) calloc(1, x)
+static inline
+void *zmalloc(size_t len)
+{
+	return calloc(1, len);
+}
 
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(array)   (sizeof(array) / (sizeof((array)[0])))
 #endif
 
+#ifndef container_of
+#define container_of(ptr, type, member)					\
+	({								\
+		const typeof(((type *)NULL)->member) * __ptr = (ptr);	\
+		(type *)((char *)__ptr - offsetof(type, member));	\
+	})
+#endif
+
 #ifndef max
 #define max(a, b) ((a) > (b) ? (a) : (b))
 #endif
 
+#ifndef max_t
+#define max_t(type, a, b)	((type) max(a, b))
+#endif
+
 #ifndef min
 #define min(a, b) ((a) < (b) ? (a) : (b))
 #endif
@@ -64,4 +83,35 @@
 #define LTTNG_PACKED __attribute__((__packed__))
 #endif
 
+/*
+ * LTTNG_HIDDEN: set the hidden attribute for internal functions
+ * On Windows, symbols are local unless explicitly exported,
+ * see https://gcc.gnu.org/wiki/Visibility
+ */
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define LTTNG_HIDDEN
+#else
+#define LTTNG_HIDDEN __attribute__((visibility("hidden")))
+#endif
+
+#define member_sizeof(type, field)	sizeof(((type *) 0)->field)
+
+/*
+ * lttng_strncpy returns 0 on success, or nonzero on failure.
+ * It checks that the @src string fits into @dst_len before performing
+ * the copy. On failure, no copy has been performed.
+ *
+ * dst_len includes the string's trailing NULL.
+ */
+static inline
+int lttng_strncpy(char *dst, const char *src, size_t dst_len)
+{
+	if (lttng_strnlen(src, dst_len) >= dst_len) {
+		/* Fail since copying would result in truncation. */
+		return -1;
+	}
+	strcpy(dst, src);
+	return 0;
+}
+
 #endif /* _MACROS_H */