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