add hg and python

1 files changed, 66 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Parser/bitset.c b/sys/src/cmd/python/Parser/bitset.c
new file mode 100644
index 000000000..b5543b81d
--- /dev/null
+++ b/sys/src/cmd/python/Parser/bitset.c
@@ -0,0 +1,66 @@
+
+/* Bitset primitives used by the parser generator */
+
+#include "pgenheaders.h"
+#include "bitset.h"
+
+bitset
+newbitset(int nbits)
+{
+	int nbytes = NBYTES(nbits);
+	bitset ss = (char *)PyObject_MALLOC(sizeof(BYTE) *  nbytes);
+	
+	if (ss == NULL)
+		Py_FatalError("no mem for bitset");
+	
+	ss += nbytes;
+	while (--nbytes >= 0)
+		*--ss = 0;
+	return ss;
+}
+
+void
+delbitset(bitset ss)
+{
+	PyObject_FREE(ss);
+}
+
+int
+addbit(bitset ss, int ibit)
+{
+	int ibyte = BIT2BYTE(ibit);
+	BYTE mask = BIT2MASK(ibit);
+	
+	if (ss[ibyte] & mask)
+		return 0; /* Bit already set */
+	ss[ibyte] |= mask;
+	return 1;
+}
+
+#if 0 /* Now a macro */
+int
+testbit(bitset ss, int ibit)
+{
+	return (ss[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0;
+}
+#endif
+
+int
+samebitset(bitset ss1, bitset ss2, int nbits)
+{
+	int i;
+	
+	for (i = NBYTES(nbits); --i >= 0; )
+		if (*ss1++ != *ss2++)
+			return 0;
+	return 1;
+}
+
+void
+mergebitset(bitset ss1, bitset ss2, int nbits)
+{
+	int i;
+	
+	for (i = NBYTES(nbits); --i >= 0; )
+		*ss1++ |= *ss2++;
+}