term_ascii.c

   1 /*      $Id: term_ascii.c,v 1.17 2011/05/20 15:48:22 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 #ifdef USE_WCHAR
  25 # include <locale.h>
  26 #endif
  27 #include <stdint.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #ifdef USE_WCHAR
  32 # include <wchar.h>
  33 #endif
  34
  35 #include "mandoc.h"
  36 #include "out.h"
  37 #include "term.h"
  38 #include "main.h"
  39
  40 /*
  41  * Sadly, this doesn't seem to be defined on systems even when they
  42  * support it.  For the time being, remove it and let those compiling
  43  * the software decide for themselves what to use.
  44  */
  45 #if 0
  46 #if ! defined(__STDC_ISO_10646__)
  47 # undef USE_WCHAR
  48 #endif
  49 #endif
  50
  51 static  struct termp     *ascii_init(enum termenc, char *);
  52 static  double            ascii_hspan(const struct termp *,
  53                                 const struct roffsu *);
  54 static  size_t            ascii_width(const struct termp *, int);
  55 static  void              ascii_advance(struct termp *, size_t);
  56 static  void              ascii_begin(struct termp *);
  57 static  void              ascii_end(struct termp *);
  58 static  void              ascii_endline(struct termp *);
  59 static  void              ascii_letter(struct termp *, int);
  60
  61 #ifdef  USE_WCHAR
  62 static  void              locale_advance(struct termp *, size_t);
  63 static  void              locale_endline(struct termp *);
  64 static  void              locale_letter(struct termp *, int);
  65 static  size_t            locale_width(const struct termp *, int);
  66 #endif
  67
  68 static struct termp *
  69 ascii_init(enum termenc enc, char *outopts)
  70 {
  71         const char      *toks[2];
  72         char            *v;
  73         struct termp    *p;
  74
  75         p = mandoc_calloc(1, sizeof(struct termp));
  76         p->enc = enc;
  77
  78         p->tabwidth = 5;
  79         p->defrmargin = 78;
  80
  81         p->begin = ascii_begin;
  82         p->end = ascii_end;
  83         p->hspan = ascii_hspan;
  84         p->type = TERMTYPE_CHAR;
  85
  86         p->enc = TERMENC_ASCII;
  87         p->advance = ascii_advance;
  88         p->endline = ascii_endline;
  89         p->letter = ascii_letter;
  90         p->width = ascii_width;
  91
  92 #ifdef  USE_WCHAR
  93         if (TERMENC_ASCII != enc) {
  94                 v = TERMENC_LOCALE == enc ?
  95                         setlocale(LC_ALL, "") :
  96                         setlocale(LC_CTYPE, "UTF-8");
  97                 if (NULL != v && MB_CUR_MAX > 1) {
  98                         p->enc = enc;
  99                         p->advance = locale_advance;
 100                         p->endline = locale_endline;
 101                         p->letter = locale_letter;
 102                         p->width = locale_width;
 103                 }
 104         }
 105 #endif
 106
 107         toks[0] = "width";
 108         toks[1] = NULL;
 109
 110         while (outopts && *outopts)
 111                 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
 112                 case (0):
 113                         p->defrmargin = (size_t)atoi(v);
 114                         break;
 115                 default:
 116                         break;
 117                 }
 118
 119         /* Enforce a lower boundary. */
 120         if (p->defrmargin < 58)
 121                 p->defrmargin = 58;
 122
 123         return(p);
 124 }
 125
 126 void *
 127 ascii_alloc(char *outopts)
 128 {
 129
 130         return(ascii_init(TERMENC_ASCII, outopts));
 131 }
 132
 133 void *
 134 utf8_alloc(char *outopts)
 135 {
 136
 137         return(ascii_init(TERMENC_UTF8, outopts));
 138 }
 139
 140
 141 void *
 142 locale_alloc(char *outopts)
 143 {
 144
 145         return(ascii_init(TERMENC_LOCALE, outopts));
 146 }
 147
 148 /* ARGSUSED */
 149 static size_t
 150 ascii_width(const struct termp *p, int c)
 151 {
 152
 153         return(1);
 154 }
 155
 156 void
 157 ascii_free(void *arg)
 158 {
 159
 160         term_free((struct termp *)arg);
 161 }
 162
 163 /* ARGSUSED */
 164 static void
 165 ascii_letter(struct termp *p, int c)
 166 {
 167
 168         putchar(c);
 169 }
 170
 171 static void
 172 ascii_begin(struct termp *p)
 173 {
 174
 175         (*p->headf)(p, p->argf);
 176 }
 177
 178 static void
 179 ascii_end(struct termp *p)
 180 {
 181
 182         (*p->footf)(p, p->argf);
 183 }
 184
 185 /* ARGSUSED */
 186 static void
 187 ascii_endline(struct termp *p)
 188 {
 189
 190         putchar('\n');
 191 }
 192
 193 /* ARGSUSED */
 194 static void
 195 ascii_advance(struct termp *p, size_t len)
 196 {
 197         size_t          i;
 198
 199         for (i = 0; i < len; i++)
 200                 putchar(' ');
 201 }
 202
 203 /* ARGSUSED */
 204 static double
 205 ascii_hspan(const struct termp *p, const struct roffsu *su)
 206 {
 207         double           r;
 208
 209         /*
 210          * Approximate based on character width.  These are generated
 211          * entirely by eyeballing the screen, but appear to be correct.
 212          */
 213
 214         switch (su->unit) {
 215         case (SCALE_CM):
 216                 r = 4 * su->scale;
 217                 break;
 218         case (SCALE_IN):
 219                 r = 10 * su->scale;
 220                 break;
 221         case (SCALE_PC):
 222                 r = (10 * su->scale) / 6;
 223                 break;
 224         case (SCALE_PT):
 225                 r = (10 * su->scale) / 72;
 226                 break;
 227         case (SCALE_MM):
 228                 r = su->scale / 1000;
 229                 break;
 230         case (SCALE_VS):
 231                 r = su->scale * 2 - 1;
 232                 break;
 233         default:
 234                 r = su->scale;
 235                 break;
 236         }
 237
 238         return(r);
 239 }
 240
 241 #ifdef USE_WCHAR
 242 /* ARGSUSED */
 243 static size_t
 244 locale_width(const struct termp *p, int c)
 245 {
 246         int             rc;
 247
 248         return((rc = wcwidth(c)) < 0 ? 0 : rc);
 249 }
 250
 251 /* ARGSUSED */
 252 static void
 253 locale_advance(struct termp *p, size_t len)
 254 {
 255         size_t          i;
 256
 257         for (i = 0; i < len; i++)
 258                 putwchar(L' ');
 259 }
 260
 261 /* ARGSUSED */
 262 static void
 263 locale_endline(struct termp *p)
 264 {
 265
 266         putwchar(L'\n');
 267 }
 268
 269 /* ARGSUSED */
 270 static void
 271 locale_letter(struct termp *p, int c)
 272 {
 273
 274         putwchar(c);
 275 }
 276 #endif