usr.bin/what/what.c

   1 /*      $NetBSD: what.c,v 1.11 2011/09/06 18:45:49 joerg Exp $  */
   2
   3 /*
   4  * Copyright (c) 1980, 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)what.c      8.1 (Berkeley) 6/6/93";
  41 #endif
  42 __RCSID("$NetBSD: what.c,v 1.11 2011/09/06 18:45:49 joerg Exp $");
  43 #endif /* not lint */
  44
  45 #include <locale.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49
  50 static void search(void);
  51 __dead static void usage(void);
  52
  53 static int matches;
  54 static int sflag;
  55
  56 /*
  57  * what
  58  */
  59 /* ARGSUSED */
  60 int
  61 main(int argc, char **argv)
  62 {
  63         int c;
  64
  65         (void)setlocale(LC_ALL, "");
  66
  67         matches = sflag = 0;
  68         while ((c = getopt(argc, argv, "s")) != -1) {
  69                 switch (c) {
  70                 case 's':
  71                         sflag = 1;
  72                         break;
  73                 case '?':
  74                 default:
  75                         usage();
  76                 }
  77         }
  78         argc -= optind;
  79         argv += optind;
  80
  81         if (argc < 1) {
  82                 usage();
  83         } else do {
  84                 if (freopen(*argv, "r", stdin) == NULL) {
  85                         perror(*argv);
  86                         exit(matches ? EXIT_SUCCESS : 1);
  87                 }
  88                 printf("%s\n", *argv);
  89                 search();
  90         } while (*++argv != NULL);
  91
  92         /* Note: the standard explicitly specifies an exit status of 1. */
  93         exit(matches ? EXIT_SUCCESS : 1);
  94         /* NOTREACHED */
  95 }
  96
  97 static void
  98 search(void)
  99 {
 100         int c;
 101
 102         while ((c = getchar()) != EOF) {
 103 loop:           if (c != '@')
 104                         continue;
 105                 if ((c = getchar()) != '(')
 106                         goto loop;
 107                 if ((c = getchar()) != '#')
 108                         goto loop;
 109                 if ((c = getchar()) != ')')
 110                         goto loop;
 111                 putchar('\t');
 112                 while ((c = getchar()) != EOF && c != '\0' && c != '"' &&
 113                     c != '>' && c != '\n' && c != '\\')
 114                         putchar(c);
 115                 putchar('\n');
 116                 matches++;
 117                 if (sflag)
 118                         break;
 119         }
 120 }
 121
 122 static void
 123 usage(void)
 124 {
 125
 126         (void)fprintf(stderr, "usage: what [-s] file ...\n");
 127         exit(1);
 128 }