Clean up ut_strlcpy(), ut_strlcpy_rev()

ut_strlcpy(): Replace with the standard function strncpy().

ut_strlcpy_rev(): Define in the same compilation unit where
the only caller resides. Avoid unnecessary definition
in non-debug builds.

Author: dr-m

storage/innobase/include/ut0mem.h

@@ -1,6 +1,7 @@
 /*****************************************************************************
 
 Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -83,29 +84,6 @@ UNIV_INLINE
 int
 ut_strcmp(const char* str1, const char* str2);
 
-/**********************************************************************//**
-Copies up to size - 1 characters from the NUL-terminated string src to
-dst, NUL-terminating the result. Returns strlen(src), so truncation
-occurred if the return value >= size.
-@return strlen(src) */
-ulint
-ut_strlcpy(
-/*=======*/
-	char*		dst,	/*!< in: destination buffer */
-	const char*	src,	/*!< in: source buffer */
-	ulint		size);	/*!< in: size of destination buffer */
-
-/**********************************************************************//**
-Like ut_strlcpy, but if src doesn't fit in dst completely, copies the last
-(size - 1) bytes of src, not the first.
-@return strlen(src) */
-ulint
-ut_strlcpy_rev(
-/*===========*/
-	char*		dst,	/*!< in: destination buffer */
-	const char*	src,	/*!< in: source buffer */
-	ulint		size);	/*!< in: size of destination buffer */
-
 /********************************************************************
 Concatenate 3 strings.*/
 char*

storage/innobase/mem/mem0mem.cc

@@ -240,6 +240,17 @@ mem_heap_validate(
 
 	ut_ad(size == heap->total_size);
 }
+
+/** Copy the tail of a string.
+@param[in,out]	dst	destination buffer
+@param[in]	src	string whose tail to copy
+@param[in]	size	size of dst buffer, in bytes, including NUL terminator
+@return strlen(src) */
+static void ut_strlcpy_rev(char* dst, const char* src, ulint size)
+{
+	size_t src_size = strlen(src), n = std::min(src_size, size - 1);
+	memcpy(dst, src + src_size - n, n + 1);
+}
 #endif /* UNIV_DEBUG */
 
 /***************************************************************//**

storage/innobase/trx/trx0trx.cc

@@ -72,7 +72,8 @@ trx_set_detailed_error(
 	trx_t*		trx,	/*!< in: transaction struct */
 	const char*	msg)	/*!< in: detailed error message */
 {
-	ut_strlcpy(trx->detailed_error, msg, MAX_DETAILED_ERROR_LEN);
+	strncpy(trx->detailed_error, msg, MAX_DETAILED_ERROR_LEN - 1);
+	trx->detailed_error[MAX_DETAILED_ERROR_LEN - 1] = '\0';
 }
 
 /*************************************************************//**

storage/innobase/ut/ut0mem.cc

@@ -1,6 +1,7 @@
 /*****************************************************************************
 
 Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -24,55 +25,6 @@ Created 5/11/1994 Heikki Tuuri
 *************************************************************************/
 
 #include "ut0mem.h"
-#include "os0thread.h"
-#include "srv0srv.h"
-#include <stdlib.h>
-
-/**********************************************************************//**
-Copies up to size - 1 characters from the NUL-terminated string src to
-dst, NUL-terminating the result. Returns strlen(src), so truncation
-occurred if the return value >= size.
-@return strlen(src) */
-ulint
-ut_strlcpy(
-/*=======*/
-	char*		dst,	/*!< in: destination buffer */
-	const char*	src,	/*!< in: source buffer */
-	ulint		size)	/*!< in: size of destination buffer */
-{
-	ulint	src_size = strlen(src);
-
-	if (size != 0) {
-		ulint	n = ut_min(src_size, size - 1);
-
-		memcpy(dst, src, n);
-		dst[n] = '\0';
-	}
-
-	return(src_size);
-}
-
-/**********************************************************************//**
-Like ut_strlcpy, but if src doesn't fit in dst completely, copies the last
-(size - 1) bytes of src, not the first.
-@return strlen(src) */
-ulint
-ut_strlcpy_rev(
-/*===========*/
-	char*		dst,	/*!< in: destination buffer */
-	const char*	src,	/*!< in: source buffer */
-	ulint		size)	/*!< in: size of destination buffer */
-{
-	ulint	src_size = strlen(src);
-
-	if (size != 0) {
-		ulint	n = ut_min(src_size, size - 1);
-
-		memcpy(dst, src + src_size - n, n + 1);
-	}
-
-	return(src_size);
-}
 
 /********************************************************************
 Concatenate 3 strings.*/