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
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifndef lint
  39 static const char copyright[] =
  40 "@(#) Copyright (c) 1980, 1988, 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif
  43
  44 #ifndef lint
  45 static const char sccsid[] = "@(#)what.c        8.1 (Berkeley) 6/6/93";
  46 #endif
  47
  48 #include <err.h>
  49 #include <stdbool.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <unistd.h>
  53
  54 static void usage(void);
  55 static bool search(bool, bool, FILE *);
  56
  57 int
  58 main(int argc, char *argv[])
  59 {
  60         const char *file;
  61         FILE *in;
  62         bool found, qflag, sflag;
  63         int c;
  64
  65         qflag = sflag = false;
  66
  67         while ((c = getopt(argc, argv, "qs")) != -1) {
  68                 switch (c) {
  69                 case 'q':
  70                         qflag = true;
  71                         break;
  72                 case 's':
  73                         sflag = true;
  74                         break;
  75                 default:
  76                         usage();
  77                 }
  78         }
  79         argc -= optind;
  80         argv += optind;
  81
  82         found = false;
  83
  84         if (argc == 0) {
  85                 if (search(sflag, qflag, stdin))
  86                         found = true;
  87         } else {
  88                 while (argc--) {
  89                         file = *argv++;
  90                         in = fopen(file, "r");
  91                         if (in == NULL) {
  92                                 if (!qflag)
  93                                         warn("%s", file);
  94                                 continue;
  95                         }
  96                         if (!qflag)
  97                                 printf("%s:\n", file);
  98                         if (search(sflag, qflag, in))
  99                                 found = true;
 100                         fclose(in);
 101                 }
 102         }
 103         exit(found ? 0 : 1);
 104 }
 105
 106 static void
 107 usage(void)
 108 {
 109         fprintf(stderr, "usage: what [-qs] [file ...]\n");
 110         exit(1);
 111 }
 112
 113 bool
 114 search(bool one, bool quiet, FILE *in)
 115 {
 116         bool found;
 117         int c;
 118
 119         found = false;
 120
 121         while ((c = getc(in)) != EOF) {
 122 loop:           if (c != '@')
 123                         continue;
 124                 if ((c = getc(in)) != '(')
 125                         goto loop;
 126                 if ((c = getc(in)) != '#')
 127                         goto loop;
 128                 if ((c = getc(in)) != ')')
 129                         goto loop;
 130                 if (!quiet)
 131                         putchar('\t');
 132                 while ((c = getc(in)) != EOF && c && c != '"' &&
 133                     c != '>' && c != '\\' && c != '\n')
 134                         putchar(c);
 135                 putchar('\n');
 136                 found = true;
 137                 if (one)
 138                         break;
 139         }
 140         return (found);
 141 }