rewrite man to make the configuration file more flexible

[unix-history] / usr / src / usr.bin / apropos / apropos.c

/*
* Copyright (c) 1987, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1987, 1993\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)apropos.c   8.2 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/queue.h>

#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../man/config.h"
#include "../man/pathnames.h"

#define MAXLINELEN      1024                    /* max line handled */

char *progname;

static int *found, foundman;

int
main(argc, argv)
       int argc;
       char *argv[];
{
       extern char *optarg;
       extern int optind;
       ENTRY *ep;
       int ch;
       char **p, *p_augment, *p_path;

       progname = "apropos";
       p_augment = p_path = NULL;
       while ((ch = getopt(argc, argv, "M:m:P:")) != EOF)
               switch (ch) {
               case 'M':
               case 'P':               /* backward compatible */
                       p_path = optarg;
                       break;
               case 'm':
                       p_augment = optarg;
                       break;
               case '?':
               default:
                       usage();
               }
       argv += optind;
       argc -= optind;

       if (argc < 1)
               usage();

       if ((found = malloc((size_t)argc)) == NULL)
               err(1, NULL);
       memset(found, 0, argc * sizeof(int));

       for (p = argv; *p; ++p)                 /* convert to lower-case */
               lowstr(*p, *p);

       if (p_augment)
               apropos(argv, p_augment, 1);
       if (p_path || (p_path = getenv("MANPATH")))
               apropos(argv, p_path, 1);
       else {
               config();
               ep = getlist("_whatdb");
               if (ep != NULL)
                       ep = ep->list.qe_next;
               for (; ep != NULL; ep = ep->list.qe_next)
                       apropos(argv, ep->s, 0);
       }

       if (!foundman) {
               (void)fprintf(stderr,
                   "apropos: no %s file found.\n", _PATH_WHATIS);
               exit(1);
       }
       for (p = argv; *p; ++p)
               if (!found[p - argv])
                       (void)printf("%s: nothing appropriate\n", *p);
}

apropos(argv, path, buildpath)
       char **argv, *path;
       int buildpath;
{
       register char *end, *name, **p;
       char buf[MAXLINELEN + 1], wbuf[MAXLINELEN + 1];

       for (name = path; name; name = end) {   /* through name list */
               if (end = index(name, ':'))
                       *end++ = '\0';

               if (buildpath) {
                       char hold[MAXPATHLEN + 1];

                       (void)sprintf(hold, "%s/%s", name, _PATH_WHATIS);
                       name = hold;
               }

               if (!freopen(name, "r", stdin))
                       continue;

               foundman = 1;

               /* for each file found */
               while (fgets(buf, sizeof(buf), stdin)) {
                       if (!index(buf, '\n')) {
                               (void)fprintf(stderr,
                                   "apropos: %s line too long.\n", name);
                               continue;
                       }
                       lowstr(buf, wbuf);
                       for (p = argv; *p; ++p)
                               if (match(wbuf, *p)) {
                                       (void)printf("%s", buf);
                                       found[p - argv] = 1;

                                       /* only print line once */
                                       while (*++p)
                                               if (match(wbuf, *p))
                                                       found[p - argv] = 1;
                                       break;
                               }
               }
       }
}

/*
* match --
*      match anywhere the string appears
*/
match(bp, str)
       register char *bp, *str;
{
       register int len;
       register char test;

       if (!*bp)
               return(0);
       /* backward compatible: everything matches empty string */
       if (!*str)
               return(1);
       for (test = *str++, len = strlen(str); *bp;)
               if (test == *bp++ && !strncmp(bp, str, len))
                       return(1);
       return(0);
}

/*
* lowstr --
*      convert a string to lower case
*/
lowstr(from, to)
       register char *from, *to;
{
       register char ch;

       while ((ch = *from++) && ch != '\n')
               *to++ = isupper(ch) ? tolower(ch) : ch;
       *to = '\0';
}

/*
* usage --
*      print usage message and die
*/
usage()
{
       (void)fprintf(stderr,
           "usage: apropos [-M path] [-m path] keyword ...\n");
       exit(1);
}