term_ascii.c

   1 /*      $Id: term_ascii.c,v 1.11 2011/01/02 12:21:07 kristaps 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 "mandoc.h"
  30 #include "out.h"
  31 #include "term.h"
  32 #include "main.h"
  33
  34 static  double            ascii_hspan(const struct termp *,
  35                                 const struct roffsu *);
  36 static  size_t            ascii_width(const struct termp *, char);
  37 static  void              ascii_advance(struct termp *, size_t);
  38 static  void              ascii_begin(struct termp *);
  39 static  void              ascii_end(struct termp *);
  40 static  void              ascii_endline(struct termp *);
  41 static  void              ascii_letter(struct termp *, char);
  42
  43
  44 void *
  45 ascii_alloc(char *outopts)
  46 {
  47         struct termp    *p;
  48         const char      *toks[2];
  49         char            *v;
  50
  51         if (NULL == (p = term_alloc(TERMENC_ASCII)))
  52                 return(NULL);
  53
  54         p->tabwidth = 5;
  55         p->defrmargin = 78;
  56
  57         p->advance = ascii_advance;
  58         p->begin = ascii_begin;
  59         p->end = ascii_end;
  60         p->endline = ascii_endline;
  61         p->hspan = ascii_hspan;
  62         p->letter = ascii_letter;
  63         p->type = TERMTYPE_CHAR;
  64         p->width = ascii_width;
  65
  66         toks[0] = "width";
  67         toks[1] = NULL;
  68
  69         while (outopts && *outopts)
  70                 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
  71                 case (0):
  72                         p->defrmargin = (size_t)atoi(v);
  73                         break;
  74                 default:
  75                         break;
  76                 }
  77
  78         /* Enforce a lower boundary. */
  79         if (p->defrmargin < 58)
  80                 p->defrmargin = 58;
  81
  82         return(p);
  83 }
  84
  85
  86 /* ARGSUSED */
  87 static size_t
  88 ascii_width(const struct termp *p, char c)
  89 {
  90
  91         return(1);
  92 }
  93
  94
  95 void
  96 ascii_free(void *arg)
  97 {
  98
  99         term_free((struct termp *)arg);
 100 }
 101
 102
 103 /* ARGSUSED */
 104 static void
 105 ascii_letter(struct termp *p, char c)
 106 {
 107
 108         /* LINTED */
 109         putchar(c);
 110 }
 111
 112
 113 static void
 114 ascii_begin(struct termp *p)
 115 {
 116
 117         (*p->headf)(p, p->argf);
 118 }
 119
 120
 121 static void
 122 ascii_end(struct termp *p)
 123 {
 124
 125         (*p->footf)(p, p->argf);
 126 }
 127
 128
 129 /* ARGSUSED */
 130 static void
 131 ascii_endline(struct termp *p)
 132 {
 133
 134         putchar('\n');
 135 }
 136
 137
 138 /* ARGSUSED */
 139 static void
 140 ascii_advance(struct termp *p, size_t len)
 141 {
 142         size_t          i;
 143
 144         /* Just print whitespace on the terminal. */
 145         for (i = 0; i < len; i++)
 146                 putchar(' ');
 147 }
 148
 149
 150 /* ARGSUSED */
 151 static double
 152 ascii_hspan(const struct termp *p, const struct roffsu *su)
 153 {
 154         double           r;
 155
 156         /*
 157          * Approximate based on character width.  These are generated
 158          * entirely by eyeballing the screen, but appear to be correct.
 159          */
 160
 161         switch (su->unit) {
 162         case (SCALE_CM):
 163                 r = 4 * su->scale;
 164                 break;
 165         case (SCALE_IN):
 166                 r = 10 * su->scale;
 167                 break;
 168         case (SCALE_PC):
 169                 r = (10 * su->scale) / 6;
 170                 break;
 171         case (SCALE_PT):
 172                 r = (10 * su->scale) / 72;
 173                 break;
 174         case (SCALE_MM):
 175                 r = su->scale / 1000;
 176                 break;
 177         case (SCALE_VS):
 178                 r = su->scale * 2 - 1;
 179                 break;
 180         default:
 181                 r = su->scale;
 182                 break;
 183         }
 184
 185         return(r);
 186 }
 187