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[lib/c] Add __NUMCHARS

This macro holds the maximum number of different values
that are a valid char. This macro is different to CHARMAX
because not all the values that a char can hold are
a valid character.

--- a/lib/c/strcspn.c

+++ b/lib/c/strcspn.c

@@ -4,7 +4,7 @@

 size_t

 strcspn(const char *s1, const char *s2)

 {

-	char buf[128];

+	char buf[__NUMCHARS];

 	unsigned char ch;

 	size_t n;

--- a/lib/c/strpbrk.c

+++ b/lib/c/strpbrk.c

@@ -4,7 +4,7 @@

 char *

 strpbrk(const char *s1, const char *s2)

 {

-	char buf[128];

+	char buf[__NUMCHARS];

 	unsigned ch;

 	memset(buf, 0, sizeof(buf));

--- a/lib/c/strspn.c

+++ b/lib/c/strspn.c

@@ -4,7 +4,7 @@

 size_t

 strspn(const char *s1, const char *s2)

 {

-	char buf[128];

+	char buf[__NUMCHARS];

 	unsigned char ch;

 	size_t n;

--- a/rootdir/include/scc/bits/amd64-sysv/arch/string.h

+++ b/rootdir/include/scc/bits/amd64-sysv/arch/string.h

@@ -1,3 +1,5 @@

 #ifndef _SIZET

 typedef unsigned long size_t;

 #endif

+

+#define __NUMCHARS 128

--- a/rootdir/include/scc/bits/i386-sysv/arch/string.h

+++ b/rootdir/include/scc/bits/i386-sysv/arch/string.h

@@ -1,3 +1,5 @@

 #ifndef _SIZET

 typedef unsigned long size_t;

 #endif

+

+#define __NUMCHARS 128

--- a/rootdir/include/scc/bits/z80-dos/arch/string.h

+++ b/rootdir/include/scc/bits/z80-dos/arch/string.h

@@ -1,3 +1,5 @@

 #ifndef _SIZET

 typedef unsigned size_t;

 #endif

+

+#define __NUMCHARS 128