manpath.c

   1 /*      $Id: manpath.c,v 1.41 2020/02/10 14:42:10 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             "includes", "man", "paper", "style", "indent", "width",
 227             "tag", "fragment", "mdoc", "noval", "toc"
 228         };
 229         const size_t ntoks = sizeof(toks) / sizeof(toks[0]);
 230
 231         const char      *errstr;
 232         char            *oldval;
 233         size_t           len, tok;
 234
 235         for (tok = 0; tok < ntoks; tok++) {
 236                 len = strlen(toks[tok]);
 237                 if (strncmp(cp, toks[tok], len) == 0 &&
 238                     strchr(" =  ", cp[len]) != NULL) {
 239                         cp += len;
 240                         if (*cp == '=')
 241                                 cp++;
 242                         while (isspace((unsigned char)*cp))
 243                                 cp++;
 244                         break;
 245                 }
 246         }
 247
 248         if (tok < 6 && *cp == '\0') {
 249                 mandoc_msg(MANDOCERR_BADVAL_MISS, 0, 0, "-O %s=?", toks[tok]);
 250                 return -1;
 251         }
 252         if (tok > 6 && tok < ntoks && *cp != '\0') {
 253                 mandoc_msg(MANDOCERR_BADVAL, 0, 0, "-O %s=%s", toks[tok], cp);
 254                 return -1;
 255         }
 256
 257         switch (tok) {
 258         case 0:
 259                 if (conf->includes != NULL) {
 260                         oldval = mandoc_strdup(conf->includes);
 261                         break;
 262                 }
 263                 conf->includes = mandoc_strdup(cp);
 264                 return 0;
 265         case 1:
 266                 if (conf->man != NULL) {
 267                         oldval = mandoc_strdup(conf->man);
 268                         break;
 269                 }
 270                 conf->man = mandoc_strdup(cp);
 271                 return 0;
 272         case 2:
 273                 if (conf->paper != NULL) {
 274                         oldval = mandoc_strdup(conf->paper);
 275                         break;
 276                 }
 277                 conf->paper = mandoc_strdup(cp);
 278                 return 0;
 279         case 3:
 280                 if (conf->style != NULL) {
 281                         oldval = mandoc_strdup(conf->style);
 282                         break;
 283                 }
 284                 conf->style = mandoc_strdup(cp);
 285                 return 0;
 286         case 4:
 287                 if (conf->indent) {
 288                         mandoc_asprintf(&oldval, "%zu", conf->indent);
 289                         break;
 290                 }
 291                 conf->indent = strtonum(cp, 0, 1000, &errstr);
 292                 if (errstr == NULL)
 293                         return 0;
 294                 mandoc_msg(MANDOCERR_BADVAL_BAD, 0, 0,
 295                     "-O indent=%s is %s", cp, errstr);
 296                 return -1;
 297         case 5:
 298                 if (conf->width) {
 299                         mandoc_asprintf(&oldval, "%zu", conf->width);
 300                         break;
 301                 }
 302                 conf->width = strtonum(cp, 1, 1000, &errstr);
 303                 if (errstr == NULL)
 304                         return 0;
 305                 mandoc_msg(MANDOCERR_BADVAL_BAD, 0, 0,
 306                     "-O width=%s is %s", cp, errstr);
 307                 return -1;
 308         case 6:
 309                 if (conf->tag != NULL) {
 310                         oldval = mandoc_strdup(conf->tag);
 311                         break;
 312                 }
 313                 conf->tag = mandoc_strdup(cp);
 314                 return 0;
 315         case 7:
 316                 conf->fragment = 1;
 317                 return 0;
 318         case 8:
 319                 conf->mdoc = 1;
 320                 return 0;
 321         case 9:
 322                 conf->noval = 1;
 323                 return 0;
 324         case 10:
 325                 conf->toc = 1;
 326                 return 0;
 327         default:
 328                 mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0, "-O %s", cp);
 329                 return -1;
 330         }
 331         if (fromfile) {
 332                 free(oldval);
 333                 return 0;
 334         } else {
 335                 mandoc_msg(MANDOCERR_BADVAL_DUPE, 0, 0,
 336                     "-O %s=%s: already set to %s", toks[tok], cp, oldval);
 337                 free(oldval);
 338                 return -1;
 339         }
 340 }