Merge pull request #176 from arduino/patch_isascii

isAscii: avoid dependency on _GNU_SOURCE

Author: facchinm

api/WCharacter.h

@@ -63,7 +63,7 @@ inline bool isAlpha(int c)
 // that fits into the ASCII character set.
 inline bool isAscii(int c)
 {
-  return ( isascii (c) == 0 ? false : true);
+  return ((c & ~0x7f) != 0 ? false : true );
 }
 
 
@@ -145,7 +145,7 @@ inline bool isHexadecimalDigit(int c)
 // ASCII character set, by clearing the high-order bits.
 inline int toAscii(int c)
 {
-  return toascii (c);
+  return (c & 0x7f);
 }
 
 

test/CMakeLists.txt

@@ -10,7 +10,7 @@ project(test-ArduinoCore-API)
 
 include_directories(../api)
 include_directories(include)
-include_directories(external/catch/v2.13.1/include)
+include_directories(external/catch/v2.13.9/include)
 
 ##########################################################################
 
@@ -81,6 +81,7 @@ set(TEST_SRCS
   src/String/test_toLowerCase.cpp
   src/String/test_toUpperCase.cpp
   src/String/test_trim.cpp
+  src/WCharacter/test_isAscii.cpp
   src/WCharacter/test_isControl.cpp
   src/WCharacter/test_isDigit.cpp
   src/WCharacter/test_isHexadecimalDigit.cpp
@@ -89,6 +90,7 @@ set(TEST_SRCS
   src/WCharacter/test_isSpace.cpp
   src/WCharacter/test_isUpperCase.cpp
   src/WCharacter/test_isWhitespace.cpp
+  src/WCharacter/test_toAscii.cpp
 )
 
 set(TEST_DUT_SRCS