out.c

   1 /*      $Id: out.c,v 1.29 2010/08/29 11:28:09 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2009, 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 <ctype.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <time.h>
  29
  30 #include "out.h"
  31
  32 /*
  33  * Convert a `scaling unit' to a consistent form, or fail.  Scaling
  34  * units are documented in groff.7, mdoc.7, man.7.
  35  */
  36 int
  37 a2roffsu(const char *src, struct roffsu *dst, enum roffscale def)
  38 {
  39         char             buf[BUFSIZ], hasd;
  40         int              i;
  41         enum roffscale   unit;
  42
  43         if ('\0' == *src)
  44                 return(0);
  45
  46         i = hasd = 0;
  47
  48         switch (*src) {
  49         case ('+'):
  50                 src++;
  51                 break;
  52         case ('-'):
  53                 buf[i++] = *src++;
  54                 break;
  55         default:
  56                 break;
  57         }
  58
  59         if ('\0' == *src)
  60                 return(0);
  61
  62         while (i < BUFSIZ) {
  63                 if ( ! isdigit((u_char)*src)) {
  64                         if ('.' != *src)
  65                                 break;
  66                         else if (hasd)
  67                                 break;
  68                         else
  69                                 hasd = 1;
  70                 }
  71                 buf[i++] = *src++;
  72         }
  73
  74         if (BUFSIZ == i || (*src && *(src + 1)))
  75                 return(0);
  76
  77         buf[i] = '\0';
  78
  79         switch (*src) {
  80         case ('c'):
  81                 unit = SCALE_CM;
  82                 break;
  83         case ('i'):
  84                 unit = SCALE_IN;
  85                 break;
  86         case ('P'):
  87                 unit = SCALE_PC;
  88                 break;
  89         case ('p'):
  90                 unit = SCALE_PT;
  91                 break;
  92         case ('f'):
  93                 unit = SCALE_FS;
  94                 break;
  95         case ('v'):
  96                 unit = SCALE_VS;
  97                 break;
  98         case ('m'):
  99                 unit = SCALE_EM;
 100                 break;
 101         case ('\0'):
 102                 if (SCALE_MAX == def)
 103                         return(0);
 104                 unit = SCALE_BU;
 105                 break;
 106         case ('u'):
 107                 unit = SCALE_BU;
 108                 break;
 109         case ('M'):
 110                 unit = SCALE_MM;
 111                 break;
 112         case ('n'):
 113                 unit = SCALE_EN;
 114                 break;
 115         default:
 116                 return(0);
 117         }
 118
 119         /* FIXME: do this in the caller. */
 120         if ((dst->scale = atof(buf)) < 0)
 121                 dst->scale = 0;
 122         dst->unit = unit;
 123         return(1);
 124 }
 125
 126
 127 /*
 128  * Correctly writes the time in nroff form, which differs from standard
 129  * form in that a space isn't printed in lieu of the extra %e field for
 130  * single-digit dates.
 131  */
 132 void
 133 time2a(time_t t, char *dst, size_t sz)
 134 {
 135         struct tm        tm;
 136         char             buf[5];
 137         char            *p;
 138         size_t           nsz;
 139
 140         assert(sz > 1);
 141         localtime_r(&t, &tm);
 142
 143         p = dst;
 144         nsz = 0;
 145
 146         dst[0] = '\0';
 147
 148         if (0 == (nsz = strftime(p, sz, "%B ", &tm)))
 149                 return;
 150
 151         p += (int)nsz;
 152         sz -= nsz;
 153
 154         if (0 == strftime(buf, sizeof(buf), "%e, ", &tm))
 155                 return;
 156
 157         nsz = strlcat(p, buf + (' ' == buf[0] ? 1 : 0), sz);
 158
 159         if (nsz >= sz)
 160                 return;
 161
 162         p += (int)nsz;
 163         sz -= nsz;
 164
 165         (void)strftime(p, sz, "%Y", &tm);
 166 }
 167
 168
 169 int
 170 a2roffdeco(enum roffdeco *d, const char **word, size_t *sz)
 171 {
 172         int              i, j, lim;
 173         char             term, c;
 174         const char      *wp;
 175         enum roffdeco    dd;
 176
 177         *d = DECO_NONE;
 178         lim = i = 0;
 179         term = '\0';
 180         wp = *word;
 181
 182         switch ((c = wp[i++])) {
 183         case ('('):
 184                 *d = DECO_SPECIAL;
 185                 lim = 2;
 186                 break;
 187         case ('F'):
 188                 /* FALLTHROUGH */
 189         case ('f'):
 190                 *d = 'F' == c ? DECO_FFONT : DECO_FONT;
 191
 192                 switch (wp[i++]) {
 193                 case ('('):
 194                         lim = 2;
 195                         break;
 196                 case ('['):
 197                         term = ']';
 198                         break;
 199                 case ('3'):
 200                         /* FALLTHROUGH */
 201                 case ('B'):
 202                         *d = DECO_BOLD;
 203                         return(i);
 204                 case ('2'):
 205                         /* FALLTHROUGH */
 206                 case ('I'):
 207                         *d = DECO_ITALIC;
 208                         return(i);
 209                 case ('P'):
 210                         *d = DECO_PREVIOUS;
 211                         return(i);
 212                 case ('1'):
 213                         /* FALLTHROUGH */
 214                 case ('R'):
 215                         *d = DECO_ROMAN;
 216                         return(i);
 217                 default:
 218                         i--;
 219                         lim = 1;
 220                         break;
 221                 }
 222                 break;
 223         case ('k'):
 224                 /* FALLTHROUGH */
 225         case ('M'):
 226                 /* FALLTHROUGH */
 227         case ('m'):
 228                 /* FALLTHROUGH */
 229         case ('*'):
 230                 if ('*' == c)
 231                         *d = DECO_RESERVED;
 232
 233                 switch (wp[i++]) {
 234                 case ('('):
 235                         lim = 2;
 236                         break;
 237                 case ('['):
 238                         term = ']';
 239                         break;
 240                 default:
 241                         i--;
 242                         lim = 1;
 243                         break;
 244                 }
 245                 break;
 246         case ('h'):
 247                 /* FALLTHROUGH */
 248         case ('v'):
 249                 /* FALLTHROUGH */
 250         case ('s'):
 251                 j = 0;
 252                 if ('+' == wp[i] || '-' == wp[i]) {
 253                         i++;
 254                         j = 1;
 255                 }
 256
 257                 switch (wp[i++]) {
 258                 case ('('):
 259                         lim = 2;
 260                         break;
 261                 case ('['):
 262                         term = ']';
 263                         break;
 264                 case ('\''):
 265                         term = '\'';
 266                         break;
 267                 case ('0'):
 268                         j = 1;
 269                         /* FALLTHROUGH */
 270                 default:
 271                         i--;
 272                         lim = 1;
 273                         break;
 274                 }
 275
 276                 if ('+' == wp[i] || '-' == wp[i]) {
 277                         if (j)
 278                                 return(i);
 279                         i++;
 280                 }
 281
 282                 /* Handle embedded numerical subexp or escape. */
 283
 284                 if ('(' == wp[i]) {
 285                         while (wp[i] && ')' != wp[i])
 286                                 if ('\\' == wp[i++]) {
 287                                         /* Handle embedded escape. */
 288                                         *word = &wp[i];
 289                                         i += a2roffdeco(&dd, word, sz);
 290                                 }
 291
 292                         if (')' == wp[i++])
 293                                 break;
 294
 295                         *d = DECO_NONE;
 296                         return(i - 1);
 297                 } else if ('\\' == wp[i]) {
 298                         *word = &wp[++i];
 299                         i += a2roffdeco(&dd, word, sz);
 300                 }
 301
 302                 break;
 303         case ('['):
 304                 *d = DECO_SPECIAL;
 305                 term = ']';
 306                 break;
 307         case ('c'):
 308                 *d = DECO_NOSPACE;
 309                 return(i);
 310         case ('z'):
 311                 *d = DECO_NONE;
 312                 if ('\\' == wp[i]) {
 313                         *word = &wp[++i];
 314                         return(i + a2roffdeco(&dd, word, sz));
 315                 } else
 316                         lim = 1;
 317                 break;
 318         case ('o'):
 319                 /* FALLTHROUGH */
 320         case ('w'):
 321                 if ('\'' == wp[i++]) {
 322                         term = '\'';
 323                         break;
 324                 }
 325                 /* FALLTHROUGH */
 326         default:
 327                 *d = DECO_SSPECIAL;
 328                 i--;
 329                 lim = 1;
 330                 break;
 331         }
 332
 333         assert(term || lim);
 334         *word = &wp[i];
 335
 336         if (term) {
 337                 j = i;
 338                 while (wp[i] && wp[i] != term)
 339                         i++;
 340                 if ('\0' == wp[i]) {
 341                         *d = DECO_NONE;
 342                         return(i);
 343                 }
 344
 345                 assert(i >= j);
 346                 *sz = (size_t)(i - j);
 347
 348                 return(i + 1);
 349         }
 350
 351         assert(lim > 0);
 352         *sz = (size_t)lim;
 353
 354         for (j = 0; wp[i] && j < lim; j++)
 355                 i++;
 356         if (j < lim)
 357                 *d = DECO_NONE;
 358
 359         return(i);
 360 }