BSD 4 release

[unix-history] / usr / src / cmd / colcrt.c

static char *sccsid = "@(#)colcrt.c     4.1 (Berkeley) 10/1/80";
#include <stdio.h>
/*
* colcrt - replaces col for crts with new nroff esp. when using tbl.
* Bill Joy UCB July 14, 1977
*
* This filter uses a screen buffer, 267 half-lines by 132 columns.
* It interprets the up and down sequences generated by the new
* nroff when used with tbl and by \u \d and \r.
* General overstriking doesn't work correctly.
* Underlining is split onto multiple lines, etc.
*
* Option - suppresses all underlining.
* Option -2 forces printing of all half lines.
*/

char    page[267][132];

int     outline = 1;
int     outcol;

char    buf[256];
char    suppresul;
char    printall;

char    *progname;
FILE    *f;

main(argc, argv)
       int argc;
       char *argv[];
{
       register c;
       register char *cp, *dp;

       argc--;
       progname = *argv++;
       while (argc > 0 && argv[0][0] == '-') {
               switch (argv[0][1]) {
                       case 0:
                               suppresul = 1;
                               break;
                       case '2':
                               printall = 1;
                               break;
                       default:
                               printf("usage: %s [ - ] [ -2 ] [ file ... ]\n", progname);
                               fflush(stdout);
                               exit(1);
               }
               argc--;
               argv++;
       }
       setbuf(stdout, buf);
       do {
               if (argc > 0) {
                       close(0);
                       if ((f=fopen(argv[0], "r")
) < 0) {
                               fflush(stdout);
                               perror(argv[0]);
                               fflush(stdout);
                               exit (1);
                       }
                       argc--;
                       argv++;
               }
               for (;;) {
                       c = getc(stdin);
                       if (c == -1) {
                               pflush(outline);
                               fflush(stdout);
                               break;
                       }
                       switch (c) {
                               case '\n':
                                       if (outline >= 265)
                                               pflush(62);
                                       outline += 2;
                                       outcol = 0;
                                       continue;
                               case '\016':
                                       case '\017':
                                       continue;
                               case 033:
                                       c = getc(stdin);
                                       switch (c) {
                                               case '9':
                                                       if (outline >= 266)
                                                               pflush(62);
                                                       outline++;
                                                       continue;
                                               case '8':
                                                       if (outline >= 1)
                                                               outline--;
                                                       continue;
                                               case '7':
                                                       outline -= 2;
                                                       if (outline < 0)
                                                               outline = 0;
                                                       continue;
                                               default:
                                                       continue;
                                       }
                               case '\b':
                                       if (outcol)
                                               outcol--;
                                       continue;
                               case '\t':
                                       outcol += 8;
                                       outcol &= ~7;
                                       outcol--;
                                       c = ' ';
                               default:
                                       if (outcol >= 132) {
                                               outcol++;
                                               continue;
                                       }
                                       cp = &page[outline][outcol];
                                       outcol++;
                                       if (c == '_') {
                                               if (suppresul)
                                                       continue;
                                               cp += 132;
                                               c = '-';
                                       }
                                       if (*cp == 0) {
                                               *cp = c;
                                               dp = cp - outcol;
                                               for (cp--; cp >= dp && *cp == 0; cp--)
                                                       *cp = ' ';
                                       } else
                                               if (plus(c, *cp) || plus(*cp, c))
                                                       *cp = '+';
                                               else if (*cp == ' ' || *cp == 0)
                                                       *cp = c;
                                       continue;
                       }
               }
       } while (argc > 0);
       fflush(stdout);
       exit(0);
}

plus(c, d)
       char c, d;
{

       return (c == '|' && d == '-' || d == '_');
}

int first;

pflush(ol)
       int ol;
{
       register int i, j;
       register char *cp;
       char lastomit;
       int l;

       l = ol;
       lastomit = 0;
       if (l > 266)
               l = 266;
       else
               l |= 1;
       for (i = first | 1; i < l; i++) {
               move(i, i - 1);
               move(i, i + 1);
       }
       for (i = first; i < l; i++) {
               cp = page[i];
               if (printall == 0 && lastomit == 0 && *cp == 0) {
                       lastomit = 1;
                       continue;
               }
               lastomit = 0;
               printf("%s\n", cp);
       }
       copy(page, page[ol], (267 - ol) * 132);
       clear(page[267- ol], ol * 132);
       outline -= ol;
       outcol = 0;
       first = 1;
}
move(l, m)
       int l, m;
{
       register char *cp, *dp;

       for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
               switch (*cp) {
                       case '|':
                               if (*dp != ' ' && *dp != '|' && *dp != 0)
                                       return;
                               break;
                       case ' ':
                               break;
                       default:
                               return;
               }
       }
       if (*cp == 0) {
               for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
                       if (*cp == '|')
                               *dp = '|';
                       else if (*dp == 0)
                               *dp = ' ';
               page[l][0] = 0;
       }
}

copy(to, from, i)
       register char *to, *from;
       register int i;
{

       if (i > 0)
               do
                       *to++ = *from++;
               while (--i);
}

clear(at, cnt)
       register char *at;
       register int cnt;
{

       if (cnt > 0)
               do
                       *at++ = 0;
               while (--cnt);
}