1 files changed, 78 insertions, 1 deletions
diff --git a/tools/include/nolibc/ctype.h b/tools/include/nolibc/ctype.h
index 6735bd906f25..e3000b2992d7 100644
--- a/tools/include/nolibc/ctype.h
+++ b/tools/include/nolibc/ctype.h
@@ -14,9 +14,86 @@
  */
 
 static __attribute__((unused))
+int isascii(int c)
+{
+	/* 0x00..0x7f */
+	return (unsigned int)c <= 0x7f;
+}
+
+static __attribute__((unused))
+int isblank(int c)
+{
+	return c == '\t' || c == ' ';
+}
+
+static __attribute__((unused))
+int iscntrl(int c)
+{
+	/* 0x00..0x1f, 0x7f */
+	return (unsigned int)c < 0x20 || c == 0x7f;
+}
+
+static __attribute__((unused))
 int isdigit(int c)
 {
-	return (unsigned int)(c - '0') <= 9;
+	return (unsigned int)(c - '0') < 10;
+}
+
+static __attribute__((unused))
+int isgraph(int c)
+{
+	/* 0x21..0x7e */
+	return (unsigned int)(c - 0x21) < 0x5e;
+}
+
+static __attribute__((unused))
+int islower(int c)
+{
+	return (unsigned int)(c - 'a') < 26;
+}
+
+static __attribute__((unused))
+int isprint(int c)
+{
+	/* 0x20..0x7e */
+	return (unsigned int)(c - 0x20) < 0x5f;
+}
+
+static __attribute__((unused))
+int isspace(int c)
+{
+	/* \t is 0x9, \n is 0xA, \v is 0xB, \f is 0xC, \r is 0xD */
+	return ((unsigned int)c == ' ') || (unsigned int)(c - 0x09) < 5;
+}
+
+static __attribute__((unused))
+int isupper(int c)
+{
+	return (unsigned int)(c - 'A') < 26;
+}
+
+static __attribute__((unused))
+int isxdigit(int c)
+{
+	return isdigit(c) || (unsigned int)(c - 'A') < 6 || (unsigned int)(c - 'a') < 6;
+}
+
+static __attribute__((unused))
+int isalpha(int c)
+{
+	return islower(c) || isupper(c);
+}
+
+static __attribute__((unused))
+int isalnum(int c)
+{
+	return isalpha(c) || isdigit(c);
+}
+
+static __attribute__((unused))
+int ispunct(int c)
+{
+	return isgraph(c) && !isalnum(c);
 }
 
 #endif /* _NOLIBC_CTYPE_H */