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1diff --git a/teensy3/WCharacter.h b/teensy3/WCharacter.h
2index 5bfe697..7c500c1 100644
3--- a/teensy3/WCharacter.h
4+++ b/teensy3/WCharacter.h
5@@ -61,7 +61,7 @@ inline boolean isAlpha(int c)
6 // that fits into the ASCII character set.
7 inline boolean isAscii(int c)
8 {
9-  return ( isascii (c) == 0 ? false : true);
10+  return ((c & ~0x7F) != 0 ? false : true);
11 }
12
13
14@@ -143,7 +143,7 @@ inline boolean isHexadecimalDigit(int c)
15 // ASCII character set, by clearing the high-order bits.
16 inline int toAscii(int c)
17 {
18-  return toascii (c);
19+  return (c & 0x7F);
20 }
21
22
23diff --git a/teensy3/avr_functions.h b/teensy3/avr_functions.h
24index 977c5e9..55c426c 100644
25--- a/teensy3/avr_functions.h
26+++ b/teensy3/avr_functions.h
27@@ -95,7 +95,7 @@ static inline void eeprom_update_block(const void *buf, void *addr, uint32_t len
28 char * ultoa(unsigned long val, char *buf, int radix);
29 char * ltoa(long val, char *buf, int radix);
30
31-#if defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2)
32+#if defined(__STRICT_ANSI__) || (defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2))
33 static inline char * utoa(unsigned int val, char *buf, int radix) __attribute__((always_inline, unused));
34 static inline char * utoa(unsigned int val, char *buf, int radix) { return ultoa(val, buf, radix); }
35 static inline char * itoa(int val, char *buf, int radix) __attribute__((always_inline, unused));
36diff --git a/teensy4/WCharacter.h b/teensy4/WCharacter.h
37index 5bfe697..7c500c1 100644
38--- a/teensy4/WCharacter.h
39+++ b/teensy4/WCharacter.h
40@@ -61,7 +61,7 @@ inline boolean isAlpha(int c)
41 // that fits into the ASCII character set.
42 inline boolean isAscii(int c)
43 {
44-  return ( isascii (c) == 0 ? false : true);
45+  return ((c & ~0x7F) != 0 ? false : true);
46 }
47
48
49@@ -143,7 +143,7 @@ inline boolean isHexadecimalDigit(int c)
50 // ASCII character set, by clearing the high-order bits.
51 inline int toAscii(int c)
52 {
53-  return toascii (c);
54+  return (c & 0x7F);
55 }
56
57
58diff --git a/teensy4/avr_functions.h b/teensy4/avr_functions.h
59index fb6ca11..3b34391 100644
60--- a/teensy4/avr_functions.h
61+++ b/teensy4/avr_functions.h
62@@ -97,7 +97,7 @@ static inline void eeprom_update_block(const void *buf, void *addr, uint32_t len
63 char * ultoa(unsigned long val, char *buf, int radix);
64 char * ltoa(long val, char *buf, int radix);
65
66-#if defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2)
67+#if defined(__STRICT_ANSI__) || (defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2))
68 static inline char * utoa(unsigned int val, char *buf, int radix) __attribute__((always_inline, unused));
69 static inline char * utoa(unsigned int val, char *buf, int radix) { return ultoa(val, buf, radix); }
70 static inline char * itoa(int val, char *buf, int radix) __attribute__((always_inline, unused));
71