introduce rcutils_strcasecmp, case insensitive string compare.

Signed-off-by: Tomoya.Fujita <[email protected]>

Author: fujitatomoya

CMakeLists.txt

@@ -64,6 +64,7 @@ set(rcutils_sources
   src/repl_str.c
   src/shared_library.c
   src/snprintf.c
+  src/strcasecmp.c
   src/split.c
   src/strdup.c
   src/strerror.c
@@ -401,6 +402,13 @@ if(BUILD_TESTING)
     target_link_libraries(test_snprintf ${PROJECT_NAME})
   endif()
 
+  rcutils_custom_add_gtest(test_strcasecmp
+    test/test_strcasecmp.cpp
+  )
+  if(TARGET test_strcasecmp)
+    target_link_libraries(test_strcasecmp ${PROJECT_NAME})
+  endif()
+
   rcutils_custom_add_gtest(test_uint8_array
     test/test_uint8_array.cpp
   )

include/rcutils/strcasecmp.h

@@ -0,0 +1,49 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef RCUTILS__STRCASECMP_H_
+#define RCUTILS__STRCASECMP_H_
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <string.h>
+
+#include "rcutils/macros.h"
+#include "rcutils/visibility_control.h"
+
+/// Case insensitive string compare.
+/**
+ * This function compares two strings ignoring case which just wraps strcasecmp()
+ * or stricmp() in a portable way. This performs a byte-by-byte comparison of the
+ * strings s1 and s2, ignoring the case of the characters.
+ *
+ * \param[in] s1 String with null terminated to compare.
+ * \param[in] s2 String with null terminated to compare.
+ * \return An integer less than, equal to, or greater than zero if s1 is, after
+ *   ignoring case, found to be less than, to match, or be greater than s2,
+ *   respectively.
+ */
+RCUTILS_PUBLIC
+RCUTILS_WARN_UNUSED
+int
+rcutils_strcasecmp(const char * s1, const char * s2);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // RCUTILS__STRCASECMP_H_

src/strcasecmp.c

@@ -0,0 +1,34 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "rcutils/strcasecmp.h"
+
+int
+rcutils_strcasecmp(const char * s1, const char * s2)
+{
+#ifndef _WIN32
+  return strcasecmp(s1, s2);
+#else
+  return stricmp(s1, s2);
+#endif
+}
+
+#ifdef __cplusplus
+}
+#endif

test/test_strcasecmp.cpp

@@ -0,0 +1,58 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <gtest/gtest.h>
+
+#include "rcutils/strcasecmp.h"
+
+// Tests the rcutils_strcasecmp() function.
+TEST(TestStrcasecmp, test_strcasecmp) {
+  EXPECT_EQ(0, rcutils_strcasecmp("", ""));
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("ABC", "ABC"));
+  EXPECT_EQ(0, rcutils_strcasecmp("1abc", "1abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("abc1", "abc1"));
+  EXPECT_EQ(0, rcutils_strcasecmp("1ABC", "1ABC"));
+  EXPECT_EQ(0, rcutils_strcasecmp("ABC1", "ABC1"));
+  EXPECT_EQ(0, rcutils_strcasecmp("ABC", "abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "ABC"));
+  EXPECT_EQ(0, rcutils_strcasecmp("Abc", "abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "Abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("Abc", "Abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("aBc", "abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "aBc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("aBc", "aBc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("abC", "abc"));
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "abC"));
+  EXPECT_EQ(0, rcutils_strcasecmp("abC", "abC"));
+
+  EXPECT_NE(0, rcutils_strcasecmp("", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", ""));
+  EXPECT_NE(0, rcutils_strcasecmp("abcd", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "abcd"));
+  EXPECT_NE(0, rcutils_strcasecmp("abcD", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "abcD"));
+  EXPECT_NE(0, rcutils_strcasecmp("1abc", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "1abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc1", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "abc1"));
+  EXPECT_NE(0, rcutils_strcasecmp("ABCd", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "ABCd"));
+  EXPECT_NE(0, rcutils_strcasecmp("1Abc", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "1Abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("a1Bc", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "a1Bc"));
+  EXPECT_NE(0, rcutils_strcasecmp("ab1C", "abc"));
+  EXPECT_NE(0, rcutils_strcasecmp("abc", "ab1C"));
+}