string.h is ANSI C include file

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

/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

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

#ifndef lint
static char sccsid[] = "@(#)apropos.c   5.10 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "../man/pathnames.h"

#define MAXLINELEN      256                     /* max line handled */

int *found, foundman;
char *progname;

main(argc, argv)
       int argc;
       char **argv;
{
       extern char *optarg;
       extern int optind;
       register char **p;
       int ch;
       char *p_augment, *p_path, *config(), *getenv(), *malloc();

       progname = "apropos";
       p_augment = p_path = NULL;
       while ((ch = getopt(argc, argv, "M:m:P:")) != EOF)
               switch((char)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 (!p_path && !(p_path = getenv("MANPATH")))
               p_path = config();

       /*NOSTRICT*/
       if (!(found = (int *)malloc((u_int)argc)))
               enomem();
       bzero((char *)found, argc * sizeof(int));

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

       if (p_augment)
               apropos(argv, p_augment);
       if (p_path)
               apropos(argv, p_path);
       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)
       char **argv, *path;
{
       register char *beg, *end, **p;
       char fname[MAXPATHLEN + 1];
       char buf[MAXLINELEN + 1], wbuf[MAXLINELEN + 1];

       for (beg = path; beg; beg = end) {      /* through path list */
               end = index(beg, ':');
               if (!end)
                       (void)sprintf(fname, "%s/%s", beg, _PATH_WHATIS);
               else {
                       (void)sprintf(fname, "%.*s/%s", end - beg, beg,
                           _PATH_WHATIS);
                       ++end;
               }
               if (!freopen(fname, "r", stdin))
                       continue;

               /* for each file found */
               for (foundman = 1; fgets(buf, sizeof(buf), stdin);) {
                       if (!index(buf, '\n')) {
                               (void)fprintf(stderr,
                                   "apropos: %s line too long.\n", fname);
                               exit(1);
                       }
                       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);
}