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[libc] Add macro definitions for tolower() and toupper()

The library is not thread safe in a lot of different places, and it
doesn't try to be thread safe because it will require a more complex
design, out of the scope of this simple library. For this reason
it is not a problem to use a global static variable.

--- a/lib/c/include/ctype.h

+++ b/lib/c/include/ctype.h

@@ -28,6 +28,7 @@

 #define _SP	0x80	/* hard space (0x20) */

 extern unsigned char __ctype[];

+extern int __ctmp;

 #define isalnum(c)  ((__ctype+1)[(c)] & (_U|_L|_D))

 #define isalpha(c)  ((__ctype+1)[(c)] & (_U|_L))

@@ -40,6 +41,9 @@

 #define isspace(c)  ((__ctype+1)[(c)] & (_S))

 #define isupper(c)  ((__ctype+1)[(c)] & (_U))

 #define isxdigit(c) ((__ctype+1)[(c)] & (_D|_X))

+

+#define tolower(c) ((__ctmp=c, isupper(__ctmp) ? __ctmp | 0x20 : __ctmp))

+#define toupper(c) ((__ctmp=c, islower(__ctmp) ? __ctmp & ~0x20 : __ctmp))

 #define isascii(c) ((unsigned)(c)<=0x7f)

--- a/lib/c/src/ctype.c

+++ b/lib/c/src/ctype.c

@@ -2,6 +2,8 @@

 #include <ctype.h>

 #undef ctype

+int __ctmp;

+

 /* __ctype is shifted by one to match EOF */

 unsigned char __ctype[257] = {

 	0,                                              /* EOF */