usr.bin/man/manconf.c

   1 /*      $NetBSD: manconf.c,v 1.7 2013/07/18 15:39:08 christos Exp $     */
   2
   3 /*
   4  * Copyright (c) 1989, 1993, 1995
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * manconf.c: provides interface for reading man.conf files
  34  *
  35  * note that this code is shared across all programs that read man.conf.
  36  * (currently: apropos, catman, makewhatis, man, and whatis...)
  37  */
  38
  39 #if HAVE_NBTOOL_CONFIG_H
  40 #include "nbtool_config.h"
  41 #endif
  42
  43 #include <sys/cdefs.h>
  44 #ifndef lint
  45 #if 0
  46 static char sccsid[] = "@(#)config.c    8.8 (Berkeley) 1/31/95";
  47 #else
  48 __RCSID("$NetBSD: manconf.c,v 1.7 2013/07/18 15:39:08 christos Exp $");
  49 #endif
  50 #endif /* not lint */
  51
  52 #include <sys/types.h>
  53 #include <sys/queue.h>
  54
  55 #include <ctype.h>
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61
  62 #include "manconf.h"
  63 #include "pathnames.h"
  64
  65 TAILQ_HEAD(_head, _tag);
  66 static struct _head head;       /* 'head' -- top level data structure */
  67
  68 /*
  69  * xstrdup: like strdup, but also returns length of string in lenp
  70  */
  71 static char *
  72 xstrdup(const char *str, size_t *lenp)
  73 {
  74         size_t len;
  75         char *copy;
  76
  77         len = strlen(str) + 1;
  78         copy = malloc(len);
  79         if (!copy)
  80                 return NULL;
  81         (void)memcpy(copy, str, len);
  82         if (lenp)
  83                 *lenp = len - 1;        /* subtract out the null */
  84         return copy;
  85 }
  86
  87 /*
  88  * config --
  89  *
  90  * Read the configuration file and build a doubly linked
  91  * list off of "head" that looks like:
  92  *
  93  *      tag1 <-> entry <-> entry <-> entry
  94  *      |
  95  *      tag2 <-> entry <-> entry <-> entry
  96  *
  97  * note: will err/errx out on error (fopen or malloc failure)
  98  */
  99 void
 100 config(const char *fname)
 101 {
 102         TAG *tp;
 103         FILE *cfp;
 104         size_t len;
 105         int lcnt;
 106         char *p, *t, type;
 107
 108         if (fname == NULL)
 109                 fname = _PATH_MANCONF;
 110         if ((cfp = fopen(fname, "r")) == NULL)
 111                 err(EXIT_FAILURE, "%s", fname);
 112         TAILQ_INIT(&head);
 113         for (lcnt = 1; (p = fgetln(cfp, &len)) != NULL; ++lcnt) {
 114                 if (len == 1)                   /* Skip empty lines. */
 115                         continue;
 116                 if (p[len - 1] != '\n') {       /* Skip corrupted lines. */
 117                         warnx("%s: line %d corrupted", fname, lcnt);
 118                         continue;
 119                 }
 120                 p[len - 1] = '\0';              /* Terminate the line. */
 121
 122                                                 /* Skip leading space. */
 123                 for (/*EMPTY*/; *p != '\0' && isspace((unsigned char)*p); ++p)
 124                         continue;
 125                                                 /* Skip empty/comment lines. */
 126                 if (*p == '\0' || *p == '#')
 127                         continue;
 128                                                 /* Find first token. */
 129                 for (t = p; *t && !isspace((unsigned char)*t); ++t)
 130                         continue;
 131                 if (*t == '\0')                 /* Need more than one token.*/
 132                         continue;
 133                 *t = '\0';
 134
 135                 tp = gettag(p, 1);
 136                 if (!tp)
 137                         errx(EXIT_FAILURE, "gettag: malloc failed");
 138
 139                 /*
 140                  * Attach new records. Check to see if it is a
 141                  * section record or not.
 142                  */
 143
 144                 if (*p == '_') {                /* not a section record */
 145                         /*
 146                          * Special cases: _build and _crunch take the
 147                          * rest of the line as a single entry.
 148                          */
 149                         if (!strcmp(p, "_build") || !strcmp(p, "_crunch")) {
 150                                 /*
 151                                  * The reason we're not just using
 152                                  * strtok(3) for all of the parsing is
 153                                  * so we don't get caught if a line
 154                                  * has only a single token on it.
 155                                  */
 156                                 while (*++t && isspace((unsigned char)*t));
 157                                 if (addentry(tp, t, 0) == -1)
 158                                         errx(EXIT_FAILURE,
 159                                             "addentry: malloc failed");
 160                         } else {
 161                                 for (++t; (p = strtok(t, " \t\n")) != NULL;
 162                                      t = NULL) {
 163                                         if (addentry(tp, p, 0) == -1)
 164                                                 errx(EXIT_FAILURE,
 165                                                    "addentry: malloc failed");
 166                                 }
 167                         }
 168
 169                 } else {                        /* section record */
 170
 171                         /*
 172                          * section entries can either be all absolute
 173                          * paths or all relative paths, but not both.
 174                          */
 175                         type = (char)((TAILQ_FIRST(&tp->entrylist) != NULL) ?
 176                             *(TAILQ_FIRST(&tp->entrylist)->s) : '\0');
 177
 178                         for (++t; (p = strtok(t, " \t\n")) != NULL; t = NULL) {
 179
 180                                 /* ensure an assigned type */
 181                                 if (type == 0)
 182                                         type = *p;
 183
 184                                 /* check for illegal mix */
 185                                 if (*p != type) {
 186         warnx("section %s: %s: invalid entry, does not match previous types",
 187               tp->s, p);
 188         warnx("man.conf cannot mix absolute and relative paths in an entry");
 189                                         continue;
 190                                 }
 191                                 if (addentry(tp, p, 0) == -1)
 192                                         errx(EXIT_FAILURE,
 193                                             "addentry: malloc failed");
 194                         }
 195                 }
 196         }
 197         (void)fclose(cfp);
 198 }
 199
 200 /*
 201  * gettag --
 202  *      if (!create) return tag for given name if it exists, or NULL otherwise
 203  *
 204  *      if (create) return tag for given name if it exists, try and create
 205  *      a new tag if it does not exist.  return NULL if unable to create new
 206  *      tag.
 207  */
 208 TAG *
 209 gettag(const char *name, int create)
 210 {
 211         TAG *tp;
 212
 213         TAILQ_FOREACH(tp, &head, q)
 214                 if (!strcmp(name, tp->s))
 215                         return tp;
 216         if (!create)
 217                 return NULL;
 218
 219         /* try and add it in */
 220         tp = malloc(sizeof(*tp));
 221         if (tp)
 222                 tp->s = xstrdup(name, &tp->len);
 223         if (!tp || !tp->s) {
 224                 if (tp)
 225                         free(tp);
 226                 return NULL;
 227         }
 228         TAILQ_INIT(&tp->entrylist);
 229         TAILQ_INSERT_TAIL(&head, tp, q);
 230         return tp;
 231 }
 232
 233 /*
 234  * addentry --
 235  *      add an entry to a list.
 236  *      returns -1 if malloc failed, otherwise 0.
 237  */
 238 int
 239 addentry(TAG *tp, const char *newent, int ishead)
 240 {
 241         ENTRY *ep;
 242
 243         ep = malloc(sizeof(*ep));
 244         if (ep)
 245                 ep->s = xstrdup(newent, &ep->len);
 246         if (!ep || !ep->s) {
 247                 if (ep)
 248                         free(ep);
 249                 return -1;
 250         }
 251         if (ishead)
 252                 TAILQ_INSERT_HEAD(&tp->entrylist, ep, q);
 253         else
 254                 TAILQ_INSERT_TAIL(&tp->entrylist, ep, q);
 255
 256         return 0;
 257 }