BSD 1 development

[unix-history] / ex-1.1 / ex_vcolumn.c

#include "ex.h"
#include "ex_tty.h"
#include "ex_vis.h"
/*
* Ex - a text editor
* Bill Joy UCB October, 1977
*/

/*
* Column returns the number of
* columns occupied by printing the
* characters through position cp of the
* current line.
*/
column(cp)
       register char *cp;
{

       if (cp == 0)
               cp = &linebuf[LBSIZE - 2];
       return (qcolumn(cp, 0));
}

qcolumn(lim, gp)
       register char *lim, *gp;
{
       register int x;
       int (*OO)();

       OO = Outchar;
       Outchar = &qcount;
       vcntcol = 0;
       if (lim != NIL)
               x = lim[1], lim[1] = 0;
       pline(0);
       if (lim != NIL)
               lim[1] = x;
       if (gp)
               while (*gp)
                       putchar(*gp++);
       Outchar = OO;
       return (vcntcol);
}

qcount(c)
       char c;
{

       switch (c) {
               case '\t':
                       vcntcol =+ 8;
                       vcntcol =& ~07;
                       break;
               default:
                       vcntcol++;
       }
}