BSD 4_4_Lite1 development

[unix-history] / usr / src / contrib / usr.x25 / nimd / buf.h

#define FLAG(bp)        (bp)->b_data[0]
#define ISEMPTY(bp)     ((bp)->b_top == (bp)->b_bot)
#define RESET(bp)       (bp)->b_top = (bp)->b_bot = (bp)->b_data
#define QEMPTY(qp)      ((qp)->b_next == (struct buf *)qp)
#define SIZE(bp)        ((bp)->b_top - (bp)->b_bot)
#define GETCHAR(bp)     (*(bp)->b_bot++ & 0377)
#define PUTCHAR(c, bp)  *(bp)->b_top++ = c
#define UNGETC(c, bp)   *--(bp)->b_bot = c
#define BUFCOPY(f, t)   bcopy((f)->b_bot, (t)->b_top, SIZE(f)); (t)->b_top+=SIZE(f);
#define STRTOBUF(s, bp) { register char *sp=s; register int l=strlen(s); \
                       bcopy(s, (bp)->b_top, l); (bp)->b_top += l;}

struct  bufhd {         /* buffer header; b_prev and b_next must be first */
       struct  buf *b_prev, *b_next;
       short   b_count;        /* total number of bytes of data queued */
};

struct  buf {
       struct  buf *b_prev, *b_next;   /* previous and next buffers */
       char    *b_bot;         /* start of useful data */
       char    *b_top;         /* current position in data */
       char    b_data[1];      /* usually more than 1 byte */
} ;

struct  buf *getbuf(), *FillBuf();