[Tarantool-patches] [PATCH v5 1/4] util: introduce strlcpy helper

[Cyrill Gorcunov <gorcunov@gmail.com>]

Very convenient to have this string extension.
We will use it in crash handling.

Acked-by: Serge Petrenko <sergepetrenko@tarantool.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 CMakeLists.txt            |  1 +
 src/lib/core/util.c       | 14 ++++++++++++++
 src/trivia/config.h.cmake |  5 +++++
 src/trivia/util.h         | 15 +++++++++++++++
 4 files changed, 35 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa6818f8e..aa23113b3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -126,6 +126,7 @@ set(CMAKE_REQUIRED_LIBRARIES "")
 check_function_exists(clock_gettime HAVE_CLOCK_GETTIME_WITHOUT_RT)
 
 check_symbol_exists(__get_cpuid cpuid.h HAVE_CPUID)
+check_symbol_exists(strlcpy string.h HAVE_STRLCPY)
 
 # Checks for libev
 include(CheckStructHasMember)
diff --git a/src/lib/core/util.c b/src/lib/core/util.c
index dfce317f0..f29886105 100644
--- a/src/lib/core/util.c
+++ b/src/lib/core/util.c
@@ -250,6 +250,20 @@ int2str(long long int val)
 	return buf;
 }
 
+#ifndef HAVE_STRLCPY
+size_t
+strlcpy(char *dst, const char *src, size_t size)
+{
+	size_t src_len = strlen(src);
+	if (size != 0) {
+		size_t len = (src_len >= size) ? size - 1 : src_len;
+		memcpy(dst, src, len);
+		dst[len] = '\0';
+	}
+	return src_len;
+}
+#endif
+
 int
 utf8_check_printable(const char *start, size_t length)
 {
diff --git a/src/trivia/config.h.cmake b/src/trivia/config.h.cmake
index 89e0d39c6..21efb978e 100644
--- a/src/trivia/config.h.cmake
+++ b/src/trivia/config.h.cmake
@@ -47,6 +47,11 @@
  */
 #cmakedefine HAVE_CPUID 1
 
+/**
+ * Defined if strlcpy() string extension helper present.
+ */
+ #cmakedefine HAVE_STRLCPY 1
+
 /*
  * Defined if gcov instrumentation should be enabled.
  */
diff --git a/src/trivia/util.h b/src/trivia/util.h
index da5a3705e..15f9881db 100644
--- a/src/trivia/util.h
+++ b/src/trivia/util.h
@@ -450,6 +450,21 @@ fpconv_strtod(const char *nptr, char **endptr)
 	return strtod(nptr, endptr);
 }
 
+#ifndef HAVE_STRLCPY
+/**
+ * Copy string. Unlike @a strncpy the result string
+ * is always null-terminated.
+ *
+ * @param dst destination buffer.
+ * @param src source string.
+ * @param size destination buffer size.
+ *
+ * @return size of @a src string.
+ */
+size_t
+strlcpy(char *dst, const char *src, size_t size);
+#endif
+
 /**
  * Check that @a str is valid utf-8 sequence and can be printed
  * unescaped.
-- 
2.26.2