X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=src%2Fcommon%2Fmacros.h;h=a03b02ac4ab96122a4ab32794069aced3972fcf0;hb=66f9eb4e8ff51f0ca0f499a49371a7002a76aa09;hp=81f901c2d5d171bda6a6f064124d8c49bbf76944;hpb=cf3f19ae5f634bf07dcdb771e66d40f805700a17;p=lttng-tools.git

diff --git a/src/common/macros.h b/src/common/macros.h
index 81f901c2d..a03b02ac4 100644
--- a/src/common/macros.h
+++ b/src/common/macros.h
@@ -20,6 +20,7 @@
 #define _MACROS_H
 
 #include <stdlib.h>
+#include <string.h>
 
 /*
  * Takes a pointer x and transform it so we can use it to access members
@@ -56,8 +57,44 @@
 #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
 
+#ifndef LTTNG_PACKED
+#define LTTNG_PACKED __attribute__((__packed__))
+#endif
+
+#ifndef LTTNG_HIDDEN
+#define LTTNG_HIDDEN __attribute__((visibility("hidden")))
+#endif
+
+/*
+ * 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 (strnlen(src, dst_len) == dst_len) {
+		/* Fail since copying would result in truncation. */
+		return -1;
+	}
+	strncpy(dst, src, dst_len);
+	/*
+	 * Be extra careful and put final \0 at the end after strncpy(),
+	 * even though we checked the length before. This makes Coverity
+	 * happy.
+	 */
+	dst[dst_len - 1] = '\0';
+	return 0;
+}
+
 #endif /* _MACROS_H */