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display.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "finger.h"

int
getscreenwidth(void)
{

#if defined(TIOCGWINSZ)
      struct winsize ws;
      if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 || ws.ws_col==0) {
            return 80;
      }
      return ws.ws_col;

#elif defined(TIOCGSIZE)
      struct ttysize ts;
      if (ioctl(STDIN_FILENO, TIOCGSIZE, &ts) < 0 || ts.ts_cols==0) {
            return 80;
      }
      return ts.ts_cols;

#else
      const char *e = getenv("COLUMNS");
      int col = e ? atoi(e) : 0;
      if (col==0) col = 80;
      return col;
#endif
}

int
is8bit(void)
{
      static int cache=-1;
      struct termios tios;
      if (cache>=0) return cache;

      if (tcgetattr(STDIN_FILENO, &tios)<0) {
            /* assume 8-bit; it's 1999 now, not 1972 */
            cache = 1;
      }
      else {
            cache = (tios.c_cflag & CSIZE)==CS8;
      }
      return cache;
}

/************/

static int send_crs=0;

void
set_crmode(void)
{
      send_crs = 1;
}

static
void
fxputc(FILE *f, int ch)
{
      /* drop any sign */
      ch = ch&0xff;

      /* on 7-bit terminals, strip high bit */
      if (!is8bit()) ch &= 0x7f; 

      /* 
       * Assume anything that isn't a control character is printable.
       * We can't count on locale stuff to tell us what's printable 
       * because we might be looking at someone who uses different
       * locale settings or is on the other side of the planet. So,
       * strip 0-31, 127, 128-159, and 255. Note that not stripping
       * 128-159 is asking for trouble, as 155 (M-esc) is interpreted
       * as esc-[ by most terminals. Hopefully this won't break anyone's
       * charset.
       * 
       * It would be nice if we could set the terminal to display in the
       * right charset, but we have no way to know what it is. feh.
       */
      
      if (((ch&0x7f) >= 32 && (ch&0x7f) != 0x7f) || ch=='\t') {
            putc(ch, f);
            return;
      }

      if (ch=='\n') {
            if (send_crs) putc('\r', f);
            putc('\n', f);
            return;
      }

      if (ch&0x80) {
            putc('M', f);
            putc('-', f);
            ch &= 0x7f;
      }

      putc('^', f);
      if (ch==0x7f) putc('?', f);
      else putc(ch+'@', f);
}

void
xputc(int ch)
{
      fxputc(stdout, ch);
}

static void fxputs(FILE *f, const char *buf) {
      int i;
      for (i=0; buf[i]; i++) fxputc(f, buf[i]);
}

int xprintf(const char *fmt, ...) {
      char buf[1024];
      va_list ap;
      
      va_start(ap, fmt);
      vsnprintf(buf, sizeof(buf), fmt, ap);
      va_end(ap);
      
      fxputs(stdout, buf);
      
      return strlen(buf);
}

int eprintf(const char *fmt, ...) {
      char buf[1024];
      va_list ap;
      
      va_start(ap, fmt);
      vsnprintf(buf, sizeof(buf), fmt, ap);
      va_end(ap);

      fxputs(stderr, buf);
      
      return strlen(buf);
}

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