manpage.c

   1 /*      $Id: manpage.c,v 1.14 2016/07/09 15:24:19 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2013 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 #include "config.h"
  19
  20 #include <sys/types.h>
  21
  22 #include <assert.h>
  23 #include <limits.h>
  24 #include <stdint.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29
  30 #include "manconf.h"
  31 #include "mansearch.h"
  32
  33 static  void     show(const char *, const char *);
  34
  35 int
  36 main(int argc, char *argv[])
  37 {
  38         int              ch, term;
  39         size_t           i, sz, linesz;
  40         ssize_t          len;
  41         struct mansearch search;
  42         struct manpage  *res;
  43         char            *conf_file, *defpaths, *auxpaths, *line;
  44         char             buf[PATH_MAX];
  45         const char      *cmd;
  46         struct manconf   conf;
  47         char            *progname;
  48         extern char     *optarg;
  49         extern int       optind;
  50
  51         term = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO);
  52
  53         progname = strrchr(argv[0], '/');
  54         if (progname == NULL)
  55                 progname = argv[0];
  56         else
  57                 ++progname;
  58
  59         auxpaths = defpaths = conf_file = NULL;
  60         memset(&conf, 0, sizeof(conf));
  61         memset(&search, 0, sizeof(struct mansearch));
  62
  63         while (-1 != (ch = getopt(argc, argv, "C:M:m:S:s:")))
  64                 switch (ch) {
  65                 case ('C'):
  66                         conf_file = optarg;
  67                         break;
  68                 case ('M'):
  69                         defpaths = optarg;
  70                         break;
  71                 case ('m'):
  72                         auxpaths = optarg;
  73                         break;
  74                 case ('S'):
  75                         search.arch = optarg;
  76                         break;
  77                 case ('s'):
  78                         search.sec = optarg;
  79                         break;
  80                 default:
  81                         goto usage;
  82                 }
  83
  84         argc -= optind;
  85         argv += optind;
  86
  87         if (0 == argc)
  88                 goto usage;
  89
  90         search.outkey = "Nd";
  91         search.argmode = ARG_EXPR;
  92
  93         manconf_parse(&conf, conf_file, defpaths, auxpaths);
  94         ch = mansearch(&search, &conf.manpath, argc, argv, &res, &sz);
  95         manconf_free(&conf);
  96
  97         if (0 == ch)
  98                 goto usage;
  99
 100         if (0 == sz) {
 101                 free(res);
 102                 return EXIT_FAILURE;
 103         } else if (1 == sz && term) {
 104                 i = 1;
 105                 goto show;
 106         } else if (NULL == res)
 107                 return EXIT_FAILURE;
 108
 109         for (i = 0; i < sz; i++) {
 110                 printf("%6zu  %s: %s\n",
 111                         i + 1, res[i].names, res[i].output);
 112                 free(res[i].names);
 113                 free(res[i].output);
 114         }
 115
 116         if (0 == term) {
 117                 for (i = 0; i < sz; i++)
 118                         free(res[i].file);
 119                 free(res);
 120                 return EXIT_SUCCESS;
 121         }
 122
 123         i = 1;
 124         printf("Enter a choice [1]: ");
 125         fflush(stdout);
 126
 127         line = NULL;
 128         linesz = 0;
 129         if ((len = getline(&line, &linesz, stdin)) != -1) {
 130                 if ('\n' == line[--len] && len > 0) {
 131                         line[len] = '\0';
 132                         if ((i = atoi(line)) < 1 || i > sz)
 133                                 i = 0;
 134                 }
 135         }
 136         free(line);
 137
 138         if (0 == i) {
 139                 for (i = 0; i < sz; i++)
 140                         free(res[i].file);
 141                 free(res);
 142                 return EXIT_SUCCESS;
 143         }
 144 show:
 145         cmd = res[i - 1].form ? "mandoc" : "cat";
 146         strlcpy(buf, res[i - 1].file, PATH_MAX);
 147         for (i = 0; i < sz; i++)
 148                 free(res[i].file);
 149         free(res);
 150
 151         show(cmd, buf);
 152         /* NOTREACHED */
 153 usage:
 154         fprintf(stderr, "usage: %s [-C conf] "
 155                                   "[-M paths] "
 156                                   "[-m paths] "
 157                                   "[-S arch] "
 158                                   "[-s section] "
 159                                   "expr ...\n",
 160                                   progname);
 161         return EXIT_FAILURE;
 162 }
 163
 164 static void
 165 show(const char *cmd, const char *file)
 166 {
 167         int              fds[2];
 168         pid_t            pid;
 169
 170         if (-1 == pipe(fds)) {
 171                 perror(NULL);
 172                 exit(EXIT_FAILURE);
 173         }
 174
 175         if (-1 == (pid = fork())) {
 176                 perror(NULL);
 177                 exit(EXIT_FAILURE);
 178         } else if (pid > 0) {
 179                 dup2(fds[0], STDIN_FILENO);
 180                 close(fds[1]);
 181                 cmd = NULL != getenv("MANPAGER") ?
 182                         getenv("MANPAGER") :
 183                         (NULL != getenv("PAGER") ?
 184                          getenv("PAGER") : "more");
 185                 execlp(cmd, cmd, (char *)NULL);
 186                 perror(cmd);
 187                 exit(EXIT_FAILURE);
 188         }
 189
 190         dup2(fds[1], STDOUT_FILENO);
 191         close(fds[0]);
 192         execlp(cmd, cmd, file, (char *)NULL);
 193         perror(cmd);
 194         exit(EXIT_FAILURE);
 195 }