add libc building to agbcc.

libc/string/strupr.c

@@ -0,0 +1,49 @@
+/*
+FUNCTION
+	<<strupr>>---force string to uppercase
+	
+INDEX
+	strupr
+
+ANSI_SYNOPSIS
+	#include <string.h>
+	char *strupr(char *<[a]>);
+
+TRAD_SYNOPSIS
+	#include <string.h>
+	char *strupr(<[a]>)
+	char *<[a]>;
+
+DESCRIPTION
+	<<strupr>> converts each characters in the string at <[a]> to
+	upper case.
+
+RETURNS
+	<<strupr>> returns its argument, <[a]>.
+
+PORTABILITY
+<<strupr>> is not widely portable.
+
+<<strupr>> requires no supporting OS subroutines.
+
+QUICKREF
+	strupr */
+
+#include <string.h>
+#include <ctype.h>
+
+char *
+strupr (a)
+     char *a;
+{
+  char *ret = a;
+
+  while (*a != '\0')
+    {
+      if (islower (*a))
+	*a = toupper (*a);
+      ++a;
+    }
+
+  return ret;
+}