BSD-SCCS END release

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

/*
* Copyright (c) 1987, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1987, 1993, 1994\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)apropos.c   8.8 (Berkeley) %G%";
#endif /* not lint */

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

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

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

static int *found, foundman;

void apropos __P((char **, char *, int));
void lowstr __P((char *, char *));
int match __P((char *, char *));
void usage __P((void));

int
main(argc, argv)
       int argc;
       char *argv[];
{
       ENTRY *ep;
       TAG *tp;
       int ch, rv;
       char *conffile, **p, *p_augment, *p_path;

       conffile = NULL;
       p_augment = p_path = NULL;
       while ((ch = getopt(argc, argv, "C:M:m:P:")) != EOF)
               switch (ch) {
               case 'C':
                       conffile = optarg;
                       break;
               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((u_int)argc * sizeof(int))) == 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(conffile);
               ep = (tp = getlist("_whatdb")) == NULL ?
                   NULL : tp->list.tqh_first;
               for (; ep != NULL; ep = ep->q.tqe_next)
                       apropos(argv, ep->s, 0);
       }

       if (!foundman)
               errx(1, "no %s file found", _PATH_WHATIS);

       rv = 1;
       for (p = argv; *p; ++p)
               if (found[p - argv])
                       rv = 0;
               else
                       (void)printf("%s: nothing appropriate\n", *p);
       exit(rv);
}

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

       for (name = path; name; name = end) {   /* through name list */
               if (end = strchr(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 (!strchr(buf, '\n')) {
                               warnx("%s: line too long", 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
*/
int
match(bp, str)
       char *bp, *str;
{
       int len;
       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
*/
void
lowstr(from, to)
       char *from, *to;
{
       char ch;

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

/*
* usage --
*      print usage message and die
*/
void
usage()
{

       (void)fprintf(stderr,
           "usage: apropos [-C file] [-M path] [-m path] keyword ...\n");
       exit(1);
}