/*
    Stretchy Buffer library.

    A stretchy buffer is a useful way of hiding the problems that
    come with wanting to read unknown amounts of stuff into a
    buffer.

    mjr. 1991
*/

#ifndef _INCL_STRETCHYBUFFER_H

typedef struct {
  char *bp;
  char *buf;
  int bc;                       /* remaining bytes */
  unsigned bsiz;                /* current buffer size */
  int rct;
  int avg;
} Sbuf;

extern char _sbufgrow(char c, Sbuf *b);
extern Sbuf *sbuf_new(void);
extern void sbuf_free(Sbuf *b);
extern void sbuf_reset(Sbuf *b);
extern void sbuf_freestatic(Sbuf *b);
extern void sbuf_initstatic(Sbuf *b);

/* get a stretchy buffer from a FILE * (emulating fgets but without sizes) */
extern char *sbuf_fgets(Sbuf *s, FILE *f);

/* copy a string into a stretchy buffer (returning string part) */
extern char *sbuf_strcpy(char *s, Sbuf *sb);

/* fast string catenation into a stretchy buffer */
extern char *sbuf_strcat(char *s, Sbuf *sb);

/* pseudo-functions */
#define sbuf_put(c,S)   (--(S)->bc > 0 ? *(S)->bp++ = c : _sbufgrow(c,S))
#define sbuf_unput(S)   (++(S)->bc, (S)->bp--)
#define sbuf_len(S) ((int)(((S)->bp - 1) - (S)->buf))
#define sbuf_buf(S) ((S)->buf)

#define _INCL_STRETCHYBUFFER_H
#endif