manpath.c

   1 /*      $Id: manpath.c,v 1.29 2015/11/07 17:58:55 schwarze Exp $        */
   2 /*
   3  * Copyright (c) 2011, 2014, 2015 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 #if HAVE_ERR
  25 #include <err.h>
  26 #endif
  27 #include <limits.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include "mandoc_aux.h"
  33 #include "manconf.h"
  34
  35 #if !HAVE_MANPATH
  36 static  void     manconf_file(struct manconf *, const char *);
  37 #endif
  38 static  void     manpath_add(struct manpaths *, const char *, int);
  39 static  void     manpath_parseline(struct manpaths *, char *, int);
  40
  41
  42 void
  43 manconf_parse(struct manconf *conf, const char *file,
  44                 char *defp, char *auxp)
  45 {
  46 #if HAVE_MANPATH
  47         char             cmd[(PATH_MAX * 3) + 20];
  48         FILE            *stream;
  49         char            *buf;
  50         size_t           sz, bsz;
  51
  52         strlcpy(cmd, "manpath", sizeof(cmd));
  53         if (file) {
  54                 strlcat(cmd, " -C ", sizeof(cmd));
  55                 strlcat(cmd, file, sizeof(cmd));
  56         }
  57         if (auxp) {
  58                 strlcat(cmd, " -m ", sizeof(cmd));
  59                 strlcat(cmd, auxp, sizeof(cmd));
  60         }
  61         if (defp) {
  62                 strlcat(cmd, " -M ", sizeof(cmd));
  63                 strlcat(cmd, defp, sizeof(cmd));
  64         }
  65
  66         /* Open manpath(1).  Ignore errors. */
  67
  68         stream = popen(cmd, "r");
  69         if (NULL == stream)
  70                 return;
  71
  72         buf = NULL;
  73         bsz = 0;
  74
  75         /* Read in as much output as we can. */
  76
  77         do {
  78                 buf = mandoc_realloc(buf, bsz + 1024);
  79                 sz = fread(buf + bsz, 1, 1024, stream);
  80                 bsz += sz;
  81         } while (sz > 0);
  82
  83         if ( ! ferror(stream) && feof(stream) &&
  84                         bsz && '\n' == buf[bsz - 1]) {
  85                 buf[bsz - 1] = '\0';
  86                 manpath_parseline(&conf->manpath, buf, 1);
  87         }
  88
  89         free(buf);
  90         pclose(stream);
  91 #else
  92         char            *insert;
  93
  94         /* Always prepend -m. */
  95         manpath_parseline(&conf->manpath, auxp, 1);
  96
  97         /* If -M is given, it overrides everything else. */
  98         if (NULL != defp) {
  99                 manpath_parseline(&conf->manpath, defp, 1);
 100                 return;
 101         }
 102
 103         /* MANPATH and man.conf(5) cooperate. */
 104         defp = getenv("MANPATH");
 105         if (NULL == file)
 106                 file = MAN_CONF_FILE;
 107
 108         /* No MANPATH; use man.conf(5) only. */
 109         if (NULL == defp || '\0' == defp[0]) {
 110                 manconf_file(conf, file);
 111                 return;
 112         }
 113
 114         /* Prepend man.conf(5) to MANPATH. */
 115         if (':' == defp[0]) {
 116                 manconf_file(conf, file);
 117                 manpath_parseline(&conf->manpath, defp, 0);
 118                 return;
 119         }
 120
 121         /* Append man.conf(5) to MANPATH. */
 122         if (':' == defp[strlen(defp) - 1]) {
 123                 manpath_parseline(&conf->manpath, defp, 0);
 124                 manconf_file(conf, file);
 125                 return;
 126         }
 127
 128         /* Insert man.conf(5) into MANPATH. */
 129         insert = strstr(defp, "::");
 130         if (NULL != insert) {
 131                 *insert++ = '\0';
 132                 manpath_parseline(&conf->manpath, defp, 0);
 133                 manconf_file(conf, file);
 134                 manpath_parseline(&conf->manpath, insert + 1, 0);
 135                 return;
 136         }
 137
 138         /* MANPATH overrides man.conf(5) completely. */
 139         manpath_parseline(&conf->manpath, defp, 0);
 140 #endif
 141 }
 142
 143 /*
 144  * Parse a FULL pathname from a colon-separated list of arrays.
 145  */
 146 static void
 147 manpath_parseline(struct manpaths *dirs, char *path, int complain)
 148 {
 149         char    *dir;
 150
 151         if (NULL == path)
 152                 return;
 153
 154         for (dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
 155                 manpath_add(dirs, dir, complain);
 156 }
 157
 158 /*
 159  * Add a directory to the array, ignoring bad directories.
 160  * Grow the array one-by-one for simplicity's sake.
 161  */
 162 static void
 163 manpath_add(struct manpaths *dirs, const char *dir, int complain)
 164 {
 165         char             buf[PATH_MAX];
 166         struct stat      sb;
 167         char            *cp;
 168         size_t           i;
 169
 170         if (NULL == (cp = realpath(dir, buf))) {
 171                 if (complain)
 172                         warn("manpath: %s", dir);
 173                 return;
 174         }
 175
 176         for (i = 0; i < dirs->sz; i++)
 177                 if (0 == strcmp(dirs->paths[i], dir))
 178                         return;
 179
 180         if (stat(cp, &sb) == -1) {
 181                 if (complain)
 182                         warn("manpath: %s", dir);
 183                 return;
 184         }
 185
 186         dirs->paths = mandoc_reallocarray(dirs->paths,
 187             dirs->sz + 1, sizeof(char *));
 188
 189         dirs->paths[dirs->sz++] = mandoc_strdup(cp);
 190 }
 191
 192 void
 193 manconf_free(struct manconf *conf)
 194 {
 195         size_t           i;
 196
 197         for (i = 0; i < conf->manpath.sz; i++)
 198                 free(conf->manpath.paths[i]);
 199
 200         free(conf->manpath.paths);
 201         free(conf->output.includes);
 202         free(conf->output.man);
 203         free(conf->output.paper);
 204         free(conf->output.style);
 205 }
 206
 207 #if !HAVE_MANPATH
 208 static void
 209 manconf_file(struct manconf *conf, const char *file)
 210 {
 211         const char *const toks[] = { "manpath", "output", "_whatdb" };
 212         char manpath_default[] = MANPATH_DEFAULT;
 213
 214         FILE            *stream;
 215         char            *line, *cp, *ep;
 216         size_t           linesz, tok, toklen;
 217         ssize_t          linelen;
 218
 219         if ((stream = fopen(file, "r")) == NULL)
 220                 goto out;
 221
 222         line = NULL;
 223         linesz = 0;
 224
 225         while ((linelen = getline(&line, &linesz, stream)) != -1) {
 226                 cp = line;
 227                 ep = cp + linelen;
 228                 if (ep[-1] != '\n')
 229                         break;
 230                 *--ep = '\0';
 231                 while (isspace((unsigned char)*cp))
 232                         cp++;
 233                 if (*cp == '#')
 234                         continue;
 235
 236                 for (tok = 0; tok < sizeof(toks)/sizeof(toks[0]); tok++) {
 237                         toklen = strlen(toks[tok]);
 238                         if (cp + toklen < ep &&
 239                             isspace((unsigned char)cp[toklen]) &&
 240                             strncmp(cp, toks[tok], toklen) == 0) {
 241                                 cp += toklen;
 242                                 while (isspace((unsigned char)*cp))
 243                                         cp++;
 244                                 break;
 245                         }
 246                 }
 247
 248                 switch (tok) {
 249                 case 2:  /* _whatdb */
 250                         while (ep > cp && ep[-1] != '/')
 251                                 ep--;
 252                         if (ep == cp)
 253                                 continue;
 254                         *ep = '\0';
 255                         /* FALLTHROUGH */
 256                 case 0:  /* manpath */
 257                         manpath_add(&conf->manpath, cp, 0);
 258                         *manpath_default = '\0';
 259                         break;
 260                 case 1:  /* output */
 261                         manconf_output(&conf->output, cp);
 262                         break;
 263                 default:
 264                         break;
 265                 }
 266         }
 267         free(line);
 268         fclose(stream);
 269
 270 out:
 271         if (*manpath_default != '\0')
 272                 manpath_parseline(&conf->manpath, manpath_default, 0);
 273 }
 274 #endif
 275
 276 void
 277 manconf_output(struct manoutput *conf, const char *cp)
 278 {
 279         const char *const toks[] = {
 280             "includes", "man", "paper", "style",
 281             "indent", "width", "fragment", "mdoc"
 282         };
 283
 284         size_t   len, tok;
 285
 286         for (tok = 0; tok < sizeof(toks)/sizeof(toks[0]); tok++) {
 287                 len = strlen(toks[tok]);
 288                 if ( ! strncmp(cp, toks[tok], len) &&
 289                     strchr(" =  ", cp[len]) != NULL) {
 290                         cp += len;
 291                         if (*cp == '=')
 292                                 cp++;
 293                         while (isspace((unsigned char)*cp))
 294                                 cp++;
 295                         break;
 296                 }
 297         }
 298
 299         if (tok < 6 && *cp == '\0')
 300                 return;
 301
 302         switch (tok) {
 303         case 0:
 304                 if (conf->includes == NULL)
 305                         conf->includes = mandoc_strdup(cp);
 306                 break;
 307         case 1:
 308                 if (conf->man == NULL)
 309                         conf->man = mandoc_strdup(cp);
 310                 break;
 311         case 2:
 312                 if (conf->paper == NULL)
 313                         conf->paper = mandoc_strdup(cp);
 314                 break;
 315         case 3:
 316                 if (conf->style == NULL)
 317                         conf->style = mandoc_strdup(cp);
 318                 break;
 319         case 4:
 320                 if (conf->indent == 0)
 321                         conf->indent = strtonum(cp, 0, 1000, NULL);
 322                 break;
 323         case 5:
 324                 if (conf->width == 0)
 325                         conf->width = strtonum(cp, 58, 1000, NULL);
 326                 break;
 327         case 6:
 328                 conf->fragment = 1;
 329                 break;
 330         case 7:
 331                 conf->mdoc = 1;
 332                 break;
 333         default:
 334                 break;
 335         }
 336 }