kernel normal format; fix whatis to look for full word tokens;

[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 this notice is preserved and that due credit is given
* to the University of California at 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'' without express or implied warranty.
*/

#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   5.5 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <stdio.h>
#include <ctype.h>
#include <strings.h>

#define DEF_PATH        "/usr/man:/usr/new/man:/usr/local/man"
#define MAXLINELEN      1000                    /* max line handled */
#define WHATIS          "whatis"                /* database name */

#define NO      0                               /* no/false */
#define YES     1                               /* yes/true */

static char *myname;

main(argc, argv)
       int argc;
       char **argv;
{
       extern char *optarg;
       extern int optind;
       register char *beg, *end, **C;
       int ch, foundman = NO, *found, isapropos;
       int a_match(), w_match(), (*match)();
       char *manpath = NULL, buf[MAXLINELEN + 1], fname[MAXPATHLEN + 1];
       char wbuf[MAXLINELEN + 1], *getenv(), *malloc();

       myname = (beg = rindex(*argv, '/')) ? beg + 1 : *argv;
       if (!strcmp(myname, "apropos")) {
               isapropos = YES;
               match = a_match;
       }
       else {
               isapropos = NO;
               match = w_match;
       }
       while ((ch = getopt(argc, argv, "M:P:")) != EOF)
               switch((char)ch) {
                       case 'M':
                       case 'P':               /* backward contemptible */
                               manpath = optarg;
                               break;
                       case '?':
                       default:
                               usage();
               }
       argv += optind;
       argc -= optind;
       if (argc < 1)
               usage();

       if (!(manpath = getenv("MANPATH")))
               manpath = DEF_PATH;

       /*NOSTRICT*/
       if (!(found = (int *)malloc((u_int)argc))) {
               fprintf(stderr, "%s: out of space.\n", myname);
               exit(1);
       }
       bzero((char *)found, argc * sizeof(int));

       if (isapropos)
               for (C = argv; *C; ++C)         /* convert to lower-case */
                       lowstr(*C, *C);
       else for (C = argv; *C; ++C)            /* trim full paths */
               if (beg = rindex(*C, '/'))
                       *C = beg + 1;

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

                                               /* for each file found */
               for (foundman = YES; gets(buf);) {
                       if (isapropos)
                               lowstr(buf, wbuf);
                       else
                               dashtrunc(buf, wbuf);
                       for (C = argv; *C; ++C)
                               if ((*match)(wbuf, *C)) {
                                       puts(buf);
                                       found[C - argv] = YES;

                                       /* only print line once */
                                       while (*++C)
                                               if ((*match)(wbuf, *C))
                                                       found[C - argv] = YES;
                                       break;
                               }
               }
       }
       if (!foundman) {
               fprintf(stderr, "%s: no %s file found in %s.\n", myname, WHATIS, manpath);
               exit(1);
       }
       for (C = argv; *C; ++C)
               if (!found[C - argv])
                       printf("%s: %s\n", *C, isapropos ? "nothing appropriate" : "not found");
}

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

       if (!*bp)
               return(NO);
       /* backward compatible: everything matches empty string */
       if (!*str)
               return(YES);
       for (test = *str++, len = strlen(str); *bp;)
               if (test == *bp++ && !strncmp(bp, str, len))
                       return(YES);
       return(NO);
}

/*
* w_match --
*      match for whatis; looks for full word match
*/
static
w_match(bp, str)
       register char *bp, *str;
{
       register int len;
       register char *start;

       if (!*str || !*bp)
               return(NO);
       for (len = strlen(str);;) {
               for (; *bp && !isdigit(*bp) && !isalpha(*bp); ++bp);
               if (!*bp)
                       break;
               for (start = bp++; *bp && (isdigit(*bp) || isalpha(*bp)); ++bp);
               if (bp - start == len && !strncasecmp(start, str, len))
                       return(YES);
       }
       return(NO);
}

/*
* dashtrunc --
*      truncate a string at " - "
*/
static
dashtrunc(from, to)
       register char *from, *to;
{
       do {
               if (from[0] == ' ' && from[1] == '-' && from[2] == ' ')
                       break;
       } while (*to++ = *from++);
       *to = '\0';
}

/*
* lowstr --
*      convert a string to lower case
*/
static
lowstr(from, to)
       register char *from, *to;
{
       do {
               *to++ = isupper(*from) ? tolower(*from) : *from;
       } while (*from++);
}

/*
* usage --
*      print usage message and die
*/
static
usage()
{
       fprintf(stderr, "usage: %s [-M path] string ...\n", myname);
       exit(1);
}