freebsd-dev/usr.bin/what/what.c

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/*
* Copyright (c) 1980, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif
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#ifndef lint
static const char sccsid[] = "@(#)what.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <err.h>
#include <stdbool.h>
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
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static void usage(void);
static bool search(bool, bool, FILE *);
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int
main(int argc, char *argv[])
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{
const char *file;
FILE *in;
bool found, qflag, sflag;
int c;
qflag = sflag = false;
while ((c = getopt(argc, argv, "qs")) != -1) {
switch (c) {
case 'q':
qflag = true;
break;
case 's':
sflag = true;
break;
default:
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usage();
}
}
argc -= optind;
argv += optind;
found = false;
if (argc == 0) {
if (search(sflag, qflag, stdin))
found = true;
} else {
while (argc--) {
file = *argv++;
in = fopen(file, "r");
if (in == NULL) {
if (!qflag)
warn("%s", file);
continue;
}
if (!qflag)
printf("%s:\n", file);
if (search(sflag, qflag, in))
found = true;
fclose(in);
}
}
exit(found ? 0 : 1);
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}
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static void
usage(void)
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{
fprintf(stderr, "usage: what [-qs] [file ...]\n");
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exit(1);
}
bool
search(bool one, bool quiet, FILE *in)
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{
bool found;
int c;
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found = false;
while ((c = getc(in)) != EOF) {
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loop: if (c != '@')
continue;
if ((c = getc(in)) != '(')
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goto loop;
if ((c = getc(in)) != '#')
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goto loop;
if ((c = getc(in)) != ')')
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goto loop;
if (!quiet)
putchar('\t');
while ((c = getc(in)) != EOF && c && c != '"' &&
c != '>' && c != '\\' && c != '\n')
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putchar(c);
putchar('\n');
found = true;
if (one)
break;
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}
return (found);
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}