term_ascii.c

   1 /*      $Id: term_ascii.c,v 1.9 2010/07/13 23:53:20 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <stdint.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28
  29 #include "out.h"
  30 #include "term.h"
  31 #include "main.h"
  32
  33 static  double            ascii_hspan(const struct termp *,
  34                                 const struct roffsu *);
  35 static  size_t            ascii_width(const struct termp *, char);
  36 static  void              ascii_advance(struct termp *, size_t);
  37 static  void              ascii_begin(struct termp *);
  38 static  void              ascii_end(struct termp *);
  39 static  void              ascii_endline(struct termp *);
  40 static  void              ascii_letter(struct termp *, char);
  41
  42
  43 void *
  44 ascii_alloc(char *outopts)
  45 {
  46         struct termp    *p;
  47         const char      *toks[2];
  48         char            *v;
  49
  50         if (NULL == (p = term_alloc(TERMENC_ASCII)))
  51                 return(NULL);
  52
  53         p->tabwidth = 5;
  54         p->defrmargin = 78;
  55
  56         p->advance = ascii_advance;
  57         p->begin = ascii_begin;
  58         p->end = ascii_end;
  59         p->endline = ascii_endline;
  60         p->hspan = ascii_hspan;
  61         p->letter = ascii_letter;
  62         p->type = TERMTYPE_CHAR;
  63         p->width = ascii_width;
  64
  65         toks[0] = "width";
  66         toks[1] = NULL;
  67
  68         while (outopts && *outopts)
  69                 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
  70                 case (0):
  71                         p->defrmargin = (size_t)atoi(v);
  72                         break;
  73                 default:
  74                         break;
  75                 }
  76
  77         /* Enforce a lower boundary. */
  78         if (p->defrmargin < 58)
  79                 p->defrmargin = 58;
  80
  81         return(p);
  82 }
  83
  84
  85 /* ARGSUSED */
  86 static size_t
  87 ascii_width(const struct termp *p, char c)
  88 {
  89
  90         return(1);
  91 }
  92
  93
  94 void
  95 ascii_free(void *arg)
  96 {
  97
  98         term_free((struct termp *)arg);
  99 }
 100
 101
 102 /* ARGSUSED */
 103 static void
 104 ascii_letter(struct termp *p, char c)
 105 {
 106
 107         putchar(c);
 108 }
 109
 110
 111 static void
 112 ascii_begin(struct termp *p)
 113 {
 114
 115         (*p->headf)(p, p->argf);
 116 }
 117
 118
 119 static void
 120 ascii_end(struct termp *p)
 121 {
 122
 123         (*p->footf)(p, p->argf);
 124 }
 125
 126
 127 /* ARGSUSED */
 128 static void
 129 ascii_endline(struct termp *p)
 130 {
 131
 132         putchar('\n');
 133 }
 134
 135
 136 /* ARGSUSED */
 137 static void
 138 ascii_advance(struct termp *p, size_t len)
 139 {
 140         size_t          i;
 141
 142         /* Just print whitespace on the terminal. */
 143         for (i = 0; i < len; i++)
 144                 putchar(' ');
 145 }
 146
 147
 148 /* ARGSUSED */
 149 static double
 150 ascii_hspan(const struct termp *p, const struct roffsu *su)
 151 {
 152         double           r;
 153
 154         /*
 155          * Approximate based on character width.  These are generated
 156          * entirely by eyeballing the screen, but appear to be correct.
 157          */
 158
 159         switch (su->unit) {
 160         case (SCALE_CM):
 161                 r = 4 * su->scale;
 162                 break;
 163         case (SCALE_IN):
 164                 r = 10 * su->scale;
 165                 break;
 166         case (SCALE_PC):
 167                 r = (10 * su->scale) / 6;
 168                 break;
 169         case (SCALE_PT):
 170                 r = (10 * su->scale) / 72;
 171                 break;
 172         case (SCALE_MM):
 173                 r = su->scale / 1000;
 174                 break;
 175         case (SCALE_VS):
 176                 r = su->scale * 2 - 1;
 177                 break;
 178         default:
 179                 r = su->scale;
 180                 break;
 181         }
 182
 183         return(r);
 184 }
 185