buffer.h

#ifndef BUFFER_H
#define BUFFER_H

typedef struct buffer
{
    char *x;
    unsigned int p;
    unsigned int n;
    int fd;
    int (*op)();
} buffer;

#define BUFFER_INIT(op, fd, buf, len) { (buf), 0, (len), (fd), (op) }

#define BUFFER_INSIZE 8192
#define BUFFER_OUTSIZE 8192

extern void buffer_init (buffer *, int (*)(), int, char *, unsigned int);

extern int buffer_flush (buffer *);
extern int buffer_puts (buffer *, const char *);
extern int buffer_putsalign (buffer *, const char *);
extern int buffer_putsflush (buffer *, const char *);
extern int buffer_put (buffer *, const char *, unsigned int);
extern int buffer_putalign (buffer *, const char *, unsigned int);
extern int buffer_putflush (buffer *, const char *, unsigned int);

#define buffer_PUTC(s,c) \
  ( ((s)->n != (s)->p) \
    ? ( (s)->x[(s)->p++] = (c), 0 ) \
    : buffer_put((s),&(c),1) \
  )

extern int buffer_feed (buffer *);
extern int buffer_get (buffer *, char *, unsigned int);
extern int buffer_bget (buffer *, char *, unsigned int);

extern char *buffer_peek (buffer *);
extern void buffer_seek (buffer *, unsigned int);

#define buffer_PEEK(s) ( (s)->x + (s)->n )
#define buffer_SEEK(s,len) ( ( (s)->p -= (len) ) , ( (s)->n += (len) ) )

#define buffer_GETC(s,c) \
  ( ((s)->p > 0) \
    ? ( *(c) = (s)->x[(s)->n], buffer_SEEK((s),1), 1 ) \
    : buffer_get((s),(c),1) \
  )

extern int buffer_copy (buffer *, buffer *);

extern int buffer_unixread (int, char *, unsigned int);
extern int buffer_unixwrite (int, const char *, unsigned int);

extern buffer *buffer_0;
extern buffer *buffer_0small;
extern buffer *buffer_1;
extern buffer *buffer_1small;
extern buffer *buffer_2;

#endif