manpath.c

   1 /*      $Id: manpath.c,v 1.43 2020/08/27 14:59:47 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2011,2014,2015,2017-2019 Ingo Schwarze <schwarze@openbsd.org>
   4  * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include "config.h"
  19
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22
  23 #include <ctype.h>
  24 #include <errno.h>
  25 #include <limits.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "mandoc_aux.h"
  31 #include "mandoc.h"
  32 #include "manconf.h"
  33
  34 static  void     manconf_file(struct manconf *, const char *);
  35 static  void     manpath_add(struct manpaths *, const char *, char);
  36 static  void     manpath_parseline(struct manpaths *, char *, char);
  37
  38
  39 void
  40 manconf_parse(struct manconf *conf, const char *file,
  41                 char *defp, char *auxp)
  42 {
  43         char            *insert;
  44
  45         /* Always prepend -m. */
  46         manpath_parseline(&conf->manpath, auxp, 'm');
  47
  48         /* If -M is given, it overrides everything else. */
  49         if (NULL != defp) {
  50                 manpath_parseline(&conf->manpath, defp, 'M');
  51                 return;
  52         }
  53
  54         /* MANPATH and man.conf(5) cooperate. */
  55         defp = getenv("MANPATH");
  56         if (NULL == file)
  57                 file = MAN_CONF_FILE;
  58
  59         /* No MANPATH; use man.conf(5) only. */
  60         if (NULL == defp || '\0' == defp[0]) {
  61                 manconf_file(conf, file);
  62                 return;
  63         }
  64
  65         /* Prepend man.conf(5) to MANPATH. */
  66         if (':' == defp[0]) {
  67                 manconf_file(conf, file);
  68                 manpath_parseline(&conf->manpath, defp, '\0');
  69                 return;
  70         }
  71
  72         /* Append man.conf(5) to MANPATH. */
  73         if (':' == defp[strlen(defp) - 1]) {
  74                 manpath_parseline(&conf->manpath, defp, '\0');
  75                 manconf_file(conf, file);
  76                 return;
  77         }
  78
  79         /* Insert man.conf(5) into MANPATH. */
  80         insert = strstr(defp, "::");
  81         if (NULL != insert) {
  82                 *insert++ = '\0';
  83                 manpath_parseline(&conf->manpath, defp, '\0');
  84                 manconf_file(conf, file);
  85                 manpath_parseline(&conf->manpath, insert + 1, '\0');
  86                 return;
  87         }
  88
  89         /* MANPATH overrides man.conf(5) completely. */
  90         manpath_parseline(&conf->manpath, defp, '\0');
  91 }
  92
  93 void
  94 manpath_base(struct manpaths *dirs)
  95 {
  96         char path_base[] = MANPATH_BASE;
  97         manpath_parseline(dirs, path_base, '\0');
  98 }
  99
 100 /*
 101  * Parse a FULL pathname from a colon-separated list of arrays.
 102  */
 103 static void
 104 manpath_parseline(struct manpaths *dirs, char *path, char option)
 105 {
 106         char    *dir;
 107
 108         if (NULL == path)
 109                 return;
 110
 111         for (dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
 112                 manpath_add(dirs, dir, option);
 113 }
 114
 115 /*
 116  * Add a directory to the array, ignoring bad directories.
 117  * Grow the array one-by-one for simplicity's sake.
 118  */
 119 static void
 120 manpath_add(struct manpaths *dirs, const char *dir, char option)
 121 {
 122         char             buf[PATH_MAX];
 123         struct stat      sb;
 124         char            *cp;
 125         size_t           i;
 126
 127         if ((cp = realpath(dir, buf)) == NULL)
 128                 goto fail;
 129
 130         for (i = 0; i < dirs->sz; i++)
 131                 if (strcmp(dirs->paths[i], dir) == 0)
 132                         return;
 133
 134         if (stat(cp, &sb) == -1)
 135                 goto fail;
 136
 137         dirs->paths = mandoc_reallocarray(dirs->paths,
 138             dirs->sz + 1, sizeof(*dirs->paths));
 139         dirs->paths[dirs->sz++] = mandoc_strdup(cp);
 140         return;
 141
 142 fail:
 143         if (option != '\0')
 144                 mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0,
 145                     "-%c %s: %s", option, dir, strerror(errno));
 146 }
 147
 148 void
 149 manconf_free(struct manconf *conf)
 150 {
 151         size_t           i;
 152
 153         for (i = 0; i < conf->manpath.sz; i++)
 154                 free(conf->manpath.paths[i]);
 155
 156         free(conf->manpath.paths);
 157         free(conf->output.includes);
 158         free(conf->output.man);
 159         free(conf->output.paper);
 160         free(conf->output.style);
 161 }
 162
 163 static void
 164 manconf_file(struct manconf *conf, const char *file)
 165 {
 166         const char *const toks[] = { "manpath", "output" };
 167         char manpath_default[] = MANPATH_DEFAULT;
 168
 169         FILE            *stream;
 170         char            *line, *cp, *ep;
 171         size_t           linesz, tok, toklen;
 172         ssize_t          linelen;
 173
 174         if ((stream = fopen(file, "r")) == NULL)
 175                 goto out;
 176
 177         line = NULL;
 178         linesz = 0;
 179
 180         while ((linelen = getline(&line, &linesz, stream)) != -1) {
 181                 cp = line;
 182                 ep = cp + linelen - 1;
 183                 while (ep > cp && isspace((unsigned char)*ep))
 184                         *ep-- = '\0';
 185                 while (isspace((unsigned char)*cp))
 186                         cp++;
 187                 if (cp == ep || *cp == '#')
 188                         continue;
 189
 190                 for (tok = 0; tok < sizeof(toks)/sizeof(toks[0]); tok++) {
 191                         toklen = strlen(toks[tok]);
 192                         if (cp + toklen < ep &&
 193                             isspace((unsigned char)cp[toklen]) &&
 194                             strncmp(cp, toks[tok], toklen) == 0) {
 195                                 cp += toklen;
 196                                 while (isspace((unsigned char)*cp))
 197                                         cp++;
 198                                 break;
 199                         }
 200                 }
 201
 202                 switch (tok) {
 203                 case 0:  /* manpath */
 204                         manpath_add(&conf->manpath, cp, '\0');
 205                         *manpath_default = '\0';
 206                         break;
 207                 case 1:  /* output */
 208                         manconf_output(&conf->output, cp, 1);
 209                         break;
 210                 default:
 211                         break;
 212                 }
 213         }
 214         free(line);
 215         fclose(stream);
 216
 217 out:
 218         if (*manpath_default != '\0')
 219                 manpath_parseline(&conf->manpath, manpath_default, '\0');
 220 }
 221
 222 int
 223 manconf_output(struct manoutput *conf, const char *cp, int fromfile)
 224 {
 225         const char *const toks[] = {
 226             /* Tokens requiring an argument. */
 227             "includes", "man", "paper", "style", "indent", "width",
 228             "outfilename", "tagfilename",
 229             /* Token taking an optional argument. */
 230             "tag",
 231             /* Tokens not taking arguments. */
 232             "fragment", "mdoc", "noval", "toc"
 233         };
 234         const size_t ntoks = sizeof(toks) / sizeof(toks[0]);
 235
 236         const char      *errstr;
 237         char            *oldval;
 238         size_t           len, tok;
 239
 240         for (tok = 0; tok < ntoks; tok++) {
 241                 len = strlen(toks[tok]);
 242                 if (strncmp(cp, toks[tok], len) == 0 &&
 243                     strchr(" =  ", cp[len]) != NULL) {
 244                         cp += len;
 245                         if (*cp == '=')
 246                                 cp++;
 247                         while (isspace((unsigned char)*cp))
 248                                 cp++;
 249                         break;
 250                 }
 251         }
 252
 253         if (tok < 8 && *cp == '\0') {
 254                 mandoc_msg(MANDOCERR_BADVAL_MISS, 0, 0, "-O %s=?", toks[tok]);
 255                 return -1;
 256         }
 257         if (tok > 8 && tok < ntoks && *cp != '\0') {
 258                 mandoc_msg(MANDOCERR_BADVAL, 0, 0, "-O %s=%s", toks[tok], cp);
 259                 return -1;
 260         }
 261
 262         switch (tok) {
 263         case 0:
 264                 if (conf->includes != NULL) {
 265                         oldval = mandoc_strdup(conf->includes);
 266                         break;
 267                 }
 268                 conf->includes = mandoc_strdup(cp);
 269                 return 0;
 270         case 1:
 271                 if (conf->man != NULL) {
 272                         oldval = mandoc_strdup(conf->man);
 273                         break;
 274                 }
 275                 conf->man = mandoc_strdup(cp);
 276                 return 0;
 277         case 2:
 278                 if (conf->paper != NULL) {
 279                         oldval = mandoc_strdup(conf->paper);
 280                         break;
 281                 }
 282                 conf->paper = mandoc_strdup(cp);
 283                 return 0;
 284         case 3:
 285                 if (conf->style != NULL) {
 286                         oldval = mandoc_strdup(conf->style);
 287                         break;
 288                 }
 289                 conf->style = mandoc_strdup(cp);
 290                 return 0;
 291         case 4:
 292                 if (conf->indent) {
 293                         mandoc_asprintf(&oldval, "%zu", conf->indent);
 294                         break;
 295                 }
 296                 conf->indent = strtonum(cp, 0, 1000, &errstr);
 297                 if (errstr == NULL)
 298                         return 0;
 299                 mandoc_msg(MANDOCERR_BADVAL_BAD, 0, 0,
 300                     "-O indent=%s is %s", cp, errstr);
 301                 return -1;
 302         case 5:
 303                 if (conf->width) {
 304                         mandoc_asprintf(&oldval, "%zu", conf->width);
 305                         break;
 306                 }
 307                 conf->width = strtonum(cp, 1, 1000, &errstr);
 308                 if (errstr == NULL)
 309                         return 0;
 310                 mandoc_msg(MANDOCERR_BADVAL_BAD, 0, 0,
 311                     "-O width=%s is %s", cp, errstr);
 312                 return -1;
 313         case 6:
 314                 if (conf->outfilename != NULL) {
 315                         oldval = mandoc_strdup(conf->outfilename);
 316                         break;
 317                 }
 318                 conf->outfilename = mandoc_strdup(cp);
 319                 return 0;
 320         case 7:
 321                 if (conf->tagfilename != NULL) {
 322                         oldval = mandoc_strdup(conf->tagfilename);
 323                         break;
 324                 }
 325                 conf->tagfilename = mandoc_strdup(cp);
 326                 return 0;
 327         /*
 328          * If the index of the following token changes,
 329          * do not forget to adjust the range check above the switch.
 330          */
 331         case 8:
 332                 if (conf->tag != NULL) {
 333                         oldval = mandoc_strdup(conf->tag);
 334                         break;
 335                 }
 336                 conf->tag = mandoc_strdup(cp);
 337                 return 0;
 338         case 9:
 339                 conf->fragment = 1;
 340                 return 0;
 341         case 10:
 342                 conf->mdoc = 1;
 343                 return 0;
 344         case 11:
 345                 conf->noval = 1;
 346                 return 0;
 347         case 12:
 348                 conf->toc = 1;
 349                 return 0;
 350         default:
 351                 mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0, "-O %s", cp);
 352                 return -1;
 353         }
 354         if (fromfile) {
 355                 free(oldval);
 356                 return 0;
 357         } else {
 358                 mandoc_msg(MANDOCERR_BADVAL_DUPE, 0, 0,
 359                     "-O %s=%s: already set to %s", toks[tok], cp, oldval);
 360                 free(oldval);
 361                 return -1;
 362         }
 363 }