line.h

/* line.h -- line centric interface */
#ifndef _LINE_H_
#define _LINE_H_

#include "names.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 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.
 */
typedef struct line {
    struct line *l_fp ;		/* Forward link to the next line        */
    struct line *l_bp ;		/* Backward link to the previous line   */
    int l_size ;			/* Allocated size                       */
    int l_used ;			/* Used size                            */
    char l_text[] ;			/* A bunch of characters                */
} *line_p ;

#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 int tabwidth ;   /* Map to $tab, default to 8, can be set to [1, .. */

/* Bindable functions */
BBINDABLE( backchar) ;
BBINDABLE( forwchar) ;
 BINDABLE( insspace) ;
 BINDABLE( yank) ;

void lchange( int flag) ;
boolean linstr( char *instr) ;
boolean linsert( int n, unicode_t c) ;
boolean linsert_byte( int n, int c) ;
boolean lover( char *ostr) ;
boolean lnewline( void) ;
boolean ldelete(  long n, boolean kflag) ;
boolean ldelchar( long n, boolean kflag) ;
int lgetchar( unicode_t *cref) ;
void kdelete( void) ;
int kinsert( int c) ;
line_p lalloc( int minsize) ; 	/* Allocate a line of at least minsize chars. */
void lfree( line_p lp) ;		/* free a line, updating buffers and windows */
const char *getkill( void) ;	/* get value of $kill */

boolean rdonly( void) ;     /* Read Only error message */

#endif
/* end of line.h */