apropos.c

   1 /*      $Id: apropos.c,v 1.23 2011/12/07 16:08:55 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
   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 AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  21
  22 #include <assert.h>
  23 #include <getopt.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "apropos_db.h"
  29 #include "mandoc.h"
  30 #include "manpath.h"
  31
  32 static  int      cmp(const void *, const void *);
  33 static  void     list(struct res *, size_t, void *);
  34 static  void     usage(void);
  35
  36 static  char    *progname;
  37
  38 int
  39 main(int argc, char *argv[])
  40 {
  41         int              ch, rc, whatis;
  42         struct manpaths  paths;
  43         size_t           terms;
  44         struct opts      opts;
  45         struct expr     *e;
  46         char            *defpaths, *auxpaths;
  47         extern int       optind;
  48         extern char     *optarg;
  49
  50         progname = strrchr(argv[0], '/');
  51         if (progname == NULL)
  52                 progname = argv[0];
  53         else
  54                 ++progname;
  55
  56         whatis = 0 == strncmp(progname, "whatis", 6);
  57
  58         memset(&paths, 0, sizeof(struct manpaths));
  59         memset(&opts, 0, sizeof(struct opts));
  60
  61         auxpaths = defpaths = NULL;
  62         e = NULL;
  63
  64         while (-1 != (ch = getopt(argc, argv, "M:m:S:s:")))
  65                 switch (ch) {
  66                 case ('M'):
  67                         defpaths = optarg;
  68                         break;
  69                 case ('m'):
  70                         auxpaths = optarg;
  71                         break;
  72                 case ('S'):
  73                         opts.arch = optarg;
  74                         break;
  75                 case ('s'):
  76                         opts.cat = optarg;
  77                         break;
  78                 default:
  79                         usage();
  80                         return(EXIT_FAILURE);
  81                 }
  82
  83         argc -= optind;
  84         argv += optind;
  85
  86         if (0 == argc)
  87                 return(EXIT_SUCCESS);
  88
  89         rc = 0;
  90
  91         manpath_parse(&paths, defpaths, auxpaths);
  92
  93         e = whatis ? termcomp(argc, argv, &terms) :
  94                      exprcomp(argc, argv, &terms);
  95
  96         if (NULL == e) {
  97                 fprintf(stderr, "%s: Bad expression\n", progname);
  98                 goto out;
  99         }
 100
 101         rc = apropos_search
 102                 (paths.sz, paths.paths,
 103                  &opts, e, terms, NULL, list);
 104
 105         if (0 == rc)
 106                 fprintf(stderr, "%s: Error reading "
 107                                 "manual database\n", progname);
 108
 109 out:
 110         manpath_free(&paths);
 111         exprfree(e);
 112
 113         return(rc ? EXIT_SUCCESS : EXIT_FAILURE);
 114 }
 115
 116 /* ARGSUSED */
 117 static void
 118 list(struct res *res, size_t sz, void *arg)
 119 {
 120         int              i;
 121
 122         qsort(res, sz, sizeof(struct res), cmp);
 123
 124         for (i = 0; i < (int)sz; i++)
 125                 printf("%s(%s%s%s) - %s\n", res[i].title,
 126                                 res[i].cat,
 127                                 *res[i].arch ? "/" : "",
 128                                 *res[i].arch ? res[i].arch : "",
 129                                 res[i].desc);
 130 }
 131
 132 static int
 133 cmp(const void *p1, const void *p2)
 134 {
 135
 136         return(strcasecmp(((const struct res *)p1)->title,
 137                                 ((const struct res *)p2)->title));
 138 }
 139
 140 static void
 141 usage(void)
 142 {
 143
 144         fprintf(stderr, "usage: %s "
 145                         "[-M manpath] "
 146                         "[-m manpath] "
 147                         "[-S arch] "
 148                         "[-s section] "
 149                         "expression...\n",
 150                         progname);
 151 }