first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

sys/include/bio.h

@@ -0,0 +1,84 @@
+/*
+ * This file is part of the UCB release of Plan 9. It is subject to the license
+ * terms in the LICENSE file found in the top-level directory of this
+ * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
+ * part of the UCB release of Plan 9, including this file, may be copied,
+ * modified, propagated, or distributed except according to the terms contained
+ * in the LICENSE file.
+ */
+
+#pragma	src	"/sys/src/lib/bio"
+#pragma	lib	"libbio.a"
+
+typedef	struct	Biobuf	Biobuf;
+typedef	struct	Biobufhdr	Biobufhdr;
+
+enum
+{
+	Bsize		= 8*1024,
+	Bungetsize	= UTFmax+1,	/* space for ungetc */
+	Bmagic		= 0x314159,
+	Beof		= -1,
+	Bbad		= -2,
+
+	Binactive	= 0,		/* states */
+	Bractive,
+	Bwactive,
+	Bracteof,
+};
+
+struct	Biobufhdr
+{
+	int	icount;		/* neg num of bytes at eob */
+	int	ocount;		/* num of bytes at bob */
+	int	rdline;		/* num of bytes after rdline */
+	int	runesize;	/* num of bytes of last getrune */
+	int	state;		/* r/w/inactive */
+	int	fid;		/* open file */
+	int	flag;		/* magic if malloc'ed */
+	int64_t	offset;		/* offset of buffer in file */
+	int	bsize;		/* size of buffer */
+	uint8_t*	bbuf;		/* pointer to beginning of buffer */
+	uint8_t*	ebuf;		/* pointer to end of buffer */
+	uint8_t*	gbuf;		/* pointer to good data in buf */
+};
+
+struct	Biobuf
+{
+	Biobufhdr;
+	uint8_t	b[Bungetsize+Bsize];
+};
+
+/* Dregs, redefined as functions for backwards compatibility */
+#define	BGETC(bp)	Bgetc(bp)
+#define	BPUTC(bp,c)	Bputc(bp,c)
+#define	BOFFSET(bp)	Boffset(bp)
+#define	BLINELEN(bp)	Blinelen(bp)
+#define	BFILDES(bp)	Bfildes(bp)
+
+int	Bbuffered(Biobufhdr*);
+int	Bfildes(Biobufhdr*);
+int	Bflush(Biobufhdr*);
+int	Bgetc(Biobufhdr*);
+int	Bgetd(Biobufhdr*, double*);
+int32_t	Bgetrune(Biobufhdr*);
+int	Binit(Biobuf*, int, int);
+int	Binits(Biobufhdr*, int, int, uint8_t*, int);
+int	Blinelen(Biobufhdr*);
+int64_t	Boffset(Biobufhdr*);
+Biobuf*	Bopen(char*, int);
+Biobuf*	Bfdopen(int, int);
+int	Bprint(Biobufhdr*, char*, ...);
+int	Bvprint(Biobufhdr*, char*, va_list);
+int	Bputc(Biobufhdr*, int);
+int	Bputrune(Biobufhdr*, int32_t);
+void*	Brdline(Biobufhdr*, int);
+char*	Brdstr(Biobufhdr*, int, int);
+int32_t	Bread(Biobufhdr*, void*, int32_t);
+int64_t	Bseek(Biobufhdr*, int64_t, int);
+int	Bterm(Biobufhdr*);
+int	Bungetc(Biobufhdr*);
+int	Bungetrune(Biobufhdr*);
+int32_t	Bwrite(Biobufhdr*, void*, int32_t);
+
+#pragma	varargck	argpos	Bprint	2