Make more improvements

This change includes many bug fixes, for the NT polyfills, strings,
memory, boot, and math libraries which were discovered by adding more
tools for recreational programming, such as PC emulation. Lemon has also
been vendored because it works so well at parsing languages.

libc/stdio/favail.c

@@ -23,7 +23,5 @@
  * Returns number of bytes available in stream buffer.
  */
 unsigned favail(FILE *f) {
-  if (f->beg == f->end) return f->size;
-  if (f->end > f->beg) return f->end - f->beg;
-  return (f->size - f->beg) + f->end;
+  return ((f->end - f->beg - 1) & (f->size - 1)) + 1;
 }

libc/stdio/fputs.c

@@ -17,8 +17,11 @@
 │ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/calls.h"
 #include "libc/errno.h"
+#include "libc/macros.h"
 #include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
 
 /**
  * Writes string to stream.
@@ -32,15 +35,14 @@
  * @return strlen(s) or -1 w/ errno on error
  */
 int fputs(const char *s, FILE *f) {
-  unsigned char *p = (unsigned char *)s;
-  int res = 0;
-  while (*p) {
-    if (fputc(*p++, f) == -1) {
+  int i, n, m;
+  n = strlen(s);
+  for (i = 0; i < n; ++i) {
+    if (fputc(s[i], f) == -1) {
       if (ferror(f) == EINTR) continue;
       if (feof(f)) errno = f->state = EPIPE;
       return -1;
     }
-    ++res;
   }
-  return ++res;
+  return n;
 }

libc/stdio/stdio.mk

@@ -28,7 +28,6 @@ LIBC_STDIO_A_DIRECTDEPS =				\
 	LIBC_ALG					\
 	LIBC_BITS					\
 	LIBC_CALLS					\
-	LIBC_CALLS_HEFTY				\
 	LIBC_CONV					\
 	LIBC_ESCAPE					\
 	LIBC_FMT					\