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[lib/c] Support only charset between 0-127

--- 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[256];

+	char buf[128];

 	unsigned char ch;

 	size_t n;

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

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

@@ -4,14 +4,15 @@

 char *

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

 {

-	int c;

-	const char *p;

+	char buf[128];

+	unsigned ch;

-	for (; c = *s1; ++s1) {

-		for (p = s2; *p && *p != c; ++p)

-			;

-		if (*p == c)

-			return (char *) s1;

-	}

-	return NULL;

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

+	while (ch = *s2++)

+		buf[ch] = 1;

+

+	while ((ch = *s1) && !buf[ch])

+		s1++;

+

+	return (ch == '\0') ? NULL : (char *) s1;

 }

--- 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[256];

+	char buf[128];

 	unsigned char ch;

 	size_t n;