usr.bin/what/what.c

   1 /*
   2  * Copyright (c) 1980, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)what.c   8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/what/what.c,v 1.5.2.1 2000/07/01 12:32:35 ps Exp $
  36  * $DragonFly: src/usr.bin/what/what.c,v 1.4 2004/11/19 17:46:40 liamfoy Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43
  44 static int sflag;
  45 static int found;
  46
  47 static void     search(void);
  48 static void     usage(void);
  49
  50 /*
  51  * what
  52  */
  53 int
  54 main(int argc, char **argv)
  55 {
  56         int c;
  57
  58         while ((c = getopt(argc, argv, "s")) != -1)
  59                 switch (c) {
  60                 case 's':
  61                         sflag = 1;
  62                         break;
  63                 default:
  64                         usage();
  65                 }
  66         argv += optind;
  67
  68         if (!*argv)
  69                 search();
  70         else do {
  71                 if (!freopen(*argv, "r", stdin))
  72                         warn("%s", *argv);
  73                 else {
  74                         printf("%s:\n", *argv);
  75                         search();
  76                 }
  77         } while(*++argv);
  78         exit(!found);
  79 }
  80
  81 static void
  82 usage(void)
  83 {
  84         (void)fprintf(stderr, "usage: what [-s] file ...\n");
  85         exit(1);
  86 }
  87
  88 static void
  89 search(void)
  90 {
  91         int c;
  92
  93         while ((c = getchar()) != EOF) {
  94 loop:           if (c != '@')
  95                         continue;
  96                 if ((c = getchar()) != '(')
  97                         goto loop;
  98                 if ((c = getchar()) != '#')
  99                         goto loop;
 100                 if ((c = getchar()) != ')')
 101                         goto loop;
 102                 putchar('\t');
 103                 while ((c = getchar()) != EOF && c && c != '"' &&
 104                     c != '>' && c != '\\' && c != '\n')
 105                         putchar(c);
 106                 putchar('\n');
 107                 found = 1;
 108                 if (sflag)
 109                         return;
 110         }
 111 }