Cleanup: namespace 'align' macros

[lttng-tools.git] / src / common / macros.h

diff --git a/src/common/macros.h b/src/common/macros.h
index 90849ed30ae5e543a577f9214bc33152864751f8..874501ef1749325b38ba6d4214990da1396cd74a 100644 (file)
--- a/src/common/macros.h
+++ b/src/common/macros.h
@@ -1,25 +1,16 @@
 /*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #ifndef _MACROS_H
 #define _MACROS_H
 
 #include <stdlib.h>
+#include <stddef.h>
 #include <string.h>
 #include <common/compat/string.h>
 
@@ -58,35 +49,65 @@ void *zmalloc(size_t len)
 #define ARRAY_SIZE(array)   (sizeof(array) / (sizeof((array)[0])))
 #endif
 
-#ifndef max
-#define max(a, b) ((a) > (b) ? (a) : (b))
+#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_t
-#define max_t(type, a, b)      ((type) max(a, b))
-#endif
 
-#ifndef min
-#define min(a, b) ((a) < (b) ? (a) : (b))
+/*
+ * The min and max macros are not needed in C++ (std::min and std::max are
+ * preferred) and they conflict with some C++ header file. Don't define them
+ * when compiling C++ source.
+ */
+#ifndef __cplusplus
+
+# ifndef max
+#  define max(a, b) ((a) > (b) ? (a) : (b))
+# endif
+
+# ifndef min
+#  define min(a, b) ((a) < (b) ? (a) : (b))
+# endif
+
+# ifndef max_t
+#  define max_t(type, a, b)    max((type) a, (type) b)
+# endif
+
+# ifndef min_t
+#  define min_t(type, a, b)    min((type) a, (type) b)
+# endif
+
 #endif
 
 #ifndef LTTNG_PACKED
 #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
+#ifndef LTTNG_NO_SANITIZE_ADDRESS
+#if defined(__clang__) || defined (__GNUC__)
+#define LTTNG_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
 #else
-#define LTTNG_HIDDEN __attribute__((visibility("hidden")))
+#define LTTNG_NO_SANITIZE_ADDRESS
 #endif
+#endif
+
+#define is_signed(type) (((type) -1) < (type) 1)
 
 #define member_sizeof(type, field)     sizeof(((type *) 0)->field)
 
+#define ASSERT_LOCKED(lock) LTTNG_ASSERT(pthread_mutex_trylock(&lock))
+
+/*
+ * Get an aligned pointer to a value. This is meant
+ * as a helper to pass an aligned pointer to a member in a packed structure
+ * to a function.
+ */
+#define ALIGNED_CONST_PTR(value) (((const typeof(value) []) { value }))
+
 /*
  * lttng_strncpy returns 0 on success, or nonzero on failure.
  * It checks that the @src string fits into @dst_len before performing
@@ -97,18 +118,23 @@ void *zmalloc(size_t len)
 static inline
 int lttng_strncpy(char *dst, const char *src, size_t dst_len)
 {
-       if (lttng_strnlen(src, dst_len) == dst_len) {
+       if (lttng_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';
+       strcpy(dst, src);
        return 0;
 }
 
+#ifdef NDEBUG
+/*
+* Force usage of the assertion condition to prevent unused variable warnings
+* when `assert()` are disabled by the `NDEBUG` definition.
+*/
+# define LTTNG_ASSERT(_cond) ((void) sizeof((void) (_cond), 0))
+#else
+# include <assert.h>
+# define LTTNG_ASSERT(_cond) assert(_cond)
+#endif
+
 #endif /* _MACROS_H */