usr.bin/banner/banner.c

   1 /*      $OpenBSD: banner.c,v 1.13 2017/05/27 07:55:44 tedu Exp $        */
   2 /*      $NetBSD: banner.c,v 1.2 1995/04/09 06:00:15 cgd Exp $   */
   3
   4 /*
   5  *      Changes for banner(1)
   6  *
   7  *      @(#)Copyright (c) 1995, Simon J. Gerraty.
   8  *
   9  *      This is free software.  It comes with NO WARRANTY.
  10  *      Permission to use, modify and distribute this source code
  11  *      is granted subject to the following conditions.
  12  *      1/ that the above copyright notice and this notice
  13  *      are preserved in all copies and that due credit be given
  14  *      to the author.
  15  *      2/ that any changes to this code are clearly commented
  16  *      as such so that the author does not get blamed for bugs
  17  *      other than his own.
  18  *
  19  *      Please send copies of changes and bug-fixes to:
  20  *      sjg@zen.void.oz.au
  21  */
  22
  23 /*
  24  * Copyright (c) 1983, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. Neither the name of the University nor the names of its contributors
  36  *    may be used to endorse or promote products derived from this software
  37  *    without specific prior written permission.
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  40  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  42  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  43  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  44  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  45  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  47  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  48  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  49  * SUCH DAMAGE.
  50  */
  51
  52 #include <stdio.h>
  53 #include <unistd.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <err.h>
  57
  58 #include "banner.h"
  59
  60 extern const char scnkey[][HEIGHT];     /* in lpdchar.c */
  61
  62 static long PW = LINELEN;
  63
  64 /* the char gen code below is lifted from lpd */
  65
  66 static char *
  67 scnline(int key, char *p, int c)
  68 {
  69         int scnwidth;
  70
  71         /*
  72          * <sjg> lpd makes chars out of the letter in question.
  73          * the results are somewhat mixed.  Sticking to '#' as
  74          * banner(1) does is more consistent.
  75          */
  76         c = '#';
  77
  78         for (scnwidth = WIDTH; --scnwidth;) {
  79                 key <<= 1;
  80                 *p++ = key & 0200 ? c : BACKGND;
  81         }
  82         return (p);
  83 }
  84
  85 #define TRC(q)  (((q)-' ')&0177)
  86
  87
  88 static int
  89 dropit(int c)
  90 {
  91         switch(c) {
  92
  93         case TRC('_'):
  94         case TRC(';'):
  95         case TRC(','):
  96         case TRC('g'):
  97         case TRC('j'):
  98         case TRC('p'):
  99         case TRC('q'):
 100         case TRC('y'):
 101                 return (DROP);
 102
 103         default:
 104                 return (0);
 105         }
 106 }
 107
 108 static void
 109 scan_out(int scfd, char *scsp, int dlm)
 110 {
 111         char *strp;
 112         int nchrs, j;
 113         char outbuf[LINELEN+1], *sp, c, cc;
 114         int d, scnhgt;
 115
 116         for (scnhgt = 0; scnhgt++ < HEIGHT+DROP; ) {
 117                 strp = &outbuf[0];
 118                 sp = scsp;
 119                 for (nchrs = 0; *sp != dlm && *sp != '\0'; ) {
 120                         cc = *sp++;
 121                         if ((unsigned char)cc < ' ' ||
 122                             (unsigned char)cc > 0x7f)
 123                                 cc = INVALID;
 124
 125                         c = TRC(cc);
 126                         d = dropit(c);
 127                         if ((!d && scnhgt > HEIGHT) || (scnhgt <= DROP && d))
 128                                 for (j = WIDTH; --j;)
 129                                         *strp++ = BACKGND;
 130                         else
 131                                 strp = scnline(scnkey[(int)c][scnhgt-1-d], strp, cc);
 132                         if (nchrs++ >= PW/(WIDTH+1)-1)
 133                                 break;
 134                         *strp++ = BACKGND;
 135                 }
 136                 while (*--strp == BACKGND && strp >= outbuf)
 137                         ;
 138                 strp++;
 139                 *strp++ = '\n';
 140                 (void) write(scfd, outbuf, strp-outbuf);
 141         }
 142 }
 143
 144 /*
 145  * for each word, print up to 10 chars in big letters.
 146  */
 147 int
 148 main(int argc __unused, char *argv[])
 149 {
 150         char word[10+1];                        /* strings limited to 10 chars */
 151
 152         while (*++argv) {
 153                 (void)strlcpy(word, *argv, sizeof (word));
 154                 scan_out(1, word, '\0');
 155         }
 156         exit(0);
 157 }