line.h


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#ifndef LINE_H_
#define LINE_H_

#include "utf8.h"

/*
 * All text is kept in circularly linked lists of "struct line" structures. These
 * begin at the header line (which is the blank line beyond the end of the
 * buffer). This line is pointed to by the "struct buffer". Each line contains a the
 * number of bytes in the line (the "used" size), the size of the text array,
 * and the text. The end of line is not stored as a byte; it's implied. Future
 * additions will include update hints, and a list of marks into the line.
 */
struct line {
	struct line *l_fp;	/* Link to the next line        */
	struct line *l_bp;	/* Link to the previous line    */
	int l_size;		/* Allocated size               */
	int l_used;		/* Used size                    */
	char l_text[1];		/* A bunch of characters.       */
};

#define lforw(lp)       ((lp)->l_fp)
#define lback(lp)       ((lp)->l_bp)
#define lgetc(lp, n)    ((lp)->l_text[(n)]&0xFF)
#define lputc(lp, n, c) ((lp)->l_text[(n)]=(c))
#define llength(lp)     ((lp)->l_used)

extern void lfree(struct line *lp);
extern void lchange(int flag);
extern int insspace(int f, int n);
extern int linstr(char *instr);
extern int linsert(int n, int c);
extern int lowrite(int c);
extern int lover(char *ostr);
extern int lnewline(void);
extern int ldelete(long n, int kflag);
extern int ldelchar(long n, int kflag);
extern int lgetchar(unicode_t *);
extern char *getctext(void);
extern int putctext(char *iline);
extern int ldelnewline(void);
extern void kdelete(void);
extern int kinsert(int c);
extern int yank(int f, int n);
extern struct line *lalloc(int);  /* Allocate a line. */

#endif  /* LINE_H_ */