Rename C++ header files to .hpp

[lttng-tools.git] / src / common / compat / string.hpp

diff --git a/src/common/compat/string.hpp b/src/common/compat/string.hpp
new file mode 100644 (file)
index 0000000..4a96cb1
--- /dev/null
+++ b/src/common/compat/string.hpp
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2015 Michael Jeanson <mjeanson@efficios.com>
+ * Copyright (C) 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#ifndef _COMPAT_STRING_H
+#define _COMPAT_STRING_H
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifdef HAVE_STRNLEN
+static inline
+size_t lttng_strnlen(const char *str, size_t max)
+{
+       return strnlen(str, max);
+}
+#else
+static inline
+size_t lttng_strnlen(const char *str, size_t max)
+{
+       size_t ret;
+       const char *end;
+
+       end = (const char *) memchr(str, 0, max);
+
+       if (end) {
+               ret = (size_t) (end - str);
+       } else {
+               ret = max;
+       }
+
+       return ret;
+}
+#endif /* HAVE_STRNLEN */
+
+#ifdef HAVE_STRNDUP
+static inline
+char *lttng_strndup(const char *s, size_t n)
+{
+       return strndup(s, n);
+}
+#else
+static inline
+char *lttng_strndup(const char *s, size_t n)
+{
+       char *ret;
+       size_t navail;
+
+       if (!s) {
+               ret = NULL;
+               goto end;
+       }
+
+       /* min() */
+       navail = strlen(s) + 1;
+       if ((n + 1) < navail) {
+               navail = n + 1;
+       }
+
+       ret = (char *) malloc(navail);
+       if (!ret) {
+               goto end;
+       }
+
+       memcpy(ret, s, navail);
+       ret[navail - 1] = '\0';
+end:
+       return ret;
+}
+#endif /* HAVE_STRNDUP */
+
+#ifdef HAVE_FLS
+static inline int lttng_fls(int val)
+{
+       return fls(val);
+}
+#else
+static inline int lttng_fls(int val)
+{
+       int r = 32;
+       unsigned int x = (unsigned int) val;
+
+       if (!x)
+               return 0;
+       if (!(x & 0xFFFF0000U)) {
+               x <<= 16;
+               r -= 16;
+       }
+       if (!(x & 0xFF000000U)) {
+               x <<= 8;
+               r -= 8;
+       }
+       if (!(x & 0xF0000000U)) {
+               x <<= 4;
+               r -= 4;
+       }
+       if (!(x & 0xC0000000U)) {
+               x <<= 2;
+               r -= 2;
+       }
+       if (!(x & 0x80000000U)) {
+               r -= 1;
+       }
+       return r;
+}
+#endif /* HAVE_FLS */
+
+#ifdef HAVE_MEMRCHR
+static inline
+void *lttng_memrchr(const void *s, int c, size_t n)
+{
+       return (void *) memrchr(s, c, n);
+}
+#else
+static inline
+void *lttng_memrchr(const void *s, int c, size_t n)
+{
+       int i;
+       const char *str = (const char *) s;
+       for (i = n-1; i >= 0; i--) {
+               if (str[i] == (char)c) {
+                       return (void *)(str+i);
+               }
+       }
+       return NULL;
+}
+#endif /* HAVE_MEMRCHR */
+
+#endif /* _COMPAT_STRING_H */