new posix/beos compatible version in public posix/ctype.h, also added isblank prototype

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4284 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/ctype.h

@@ -0,0 +1,32 @@
+#ifndef _CTYPE_H
+#define _CTYPE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int isalnum(int);
+int isalpha(int);
+int isascii(int);
+int isblank(int);
+int iscntrl(int);
+int isdigit(int);
+int isgraph(int);
+int islower(int);
+int isprint(int);
+int ispunct(int);
+int isspace(int);
+int isupper(int);
+int isxdigit(int);
+int toascii(int);
+int tolower(int);
+int toupper(int);
+
+#define _toupper(ch) ((int) (((int)ch) - 'a' + 'A'))
+#define _tolower(ch) ((int) (((int)ch) - 'A' + 'a'))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _CTYPE_H