Initial revision
diff --git a/include/bio.h b/include/bio.h
new file mode 100644
index 0000000..c481239
--- /dev/null
+++ b/include/bio.h
@@ -0,0 +1,79 @@
+#ifndef _BIOH_
+#define _BIOH_ 1
+
+#include <sys/types.h> /* for off_t */
+#include <fcntl.h> /* for O_RDONLY, O_WRONLY */
+
+typedef struct Biobuf Biobuf;
+
+enum
+{
+ Bsize = 8*1024,
+ Bungetsize = 4, /* space for ungetc */
+ Bmagic = 0x314159,
+ Beof = -1,
+ Bbad = -2,
+
+ Binactive = 0, /* states */
+ Bractive,
+ Bwactive,
+ Bracteof,
+
+ Bend
+};
+
+struct Biobuf
+{
+ 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 */
+ off_t offset; /* offset of buffer in file */
+ int bsize; /* size of buffer */
+ unsigned char* bbuf; /* pointer to beginning of buffer */
+ unsigned char* ebuf; /* pointer to end of buffer */
+ unsigned char* gbuf; /* pointer to good data in buf */
+ unsigned char b[Bungetsize+Bsize];
+};
+
+#define BGETC(bp)\
+ ((bp)->icount?(bp)->bbuf[(bp)->bsize+(bp)->icount++]:Bgetc((bp)))
+#define BPUTC(bp,c)\
+ ((bp)->ocount?(bp)->bbuf[(bp)->bsize+(bp)->ocount++]=(c),0:Bputc((bp),(c)))
+#define BOFFSET(bp)\
+ (((bp)->state==Bractive)?\
+ (bp)->offset + (bp)->icount:\
+ (((bp)->state==Bwactive)?\
+ (bp)->offset + ((bp)->bsize + (bp)->ocount):\
+ -1))
+#define BLINELEN(bp)\
+ (bp)->rdline
+#define BFILDES(bp)\
+ (bp)->fid
+
+int Bbuffered(Biobuf*);
+int Bfildes(Biobuf*);
+int Bflush(Biobuf*);
+int Bgetc(Biobuf*);
+int Bgetd(Biobuf*, double*);
+int Binit(Biobuf*, int, int);
+int Binits(Biobuf*, int, int, unsigned char*, int);
+int Blinelen(Biobuf*);
+off_t Boffset(Biobuf*);
+Biobuf* Bopen(char*, int);
+int Bprint(Biobuf*, char*, ...);
+int Bputc(Biobuf*, int);
+void* Brdline(Biobuf*, int);
+long Bread(Biobuf*, void*, long);
+off_t Bseek(Biobuf*, off_t, int);
+int Bterm(Biobuf*);
+int Bungetc(Biobuf*);
+long Bwrite(Biobuf*, void*, long);
+char* Brdstr(Biobuf*, int, int);
+long Bgetrune(Biobuf*);
+int Bputrune(Biobuf*, long);
+
+#endif
