NetBSD/usr.bin/file/fsmagic.c

128 lines
3.4 KiB
C

/*
* fsmagic - magic based on filesystem info - directory, special files, etc.
*
* Copyright (c) Ian F. Darwin, 1987.
* Written by Ian F. Darwin.
*
* This software is not subject to any license of the American Telephone
* and Telegraph Company or of the Regents of the University of California.
*
* Permission is granted to anyone to use this software for any purpose on
* any computer system, and to alter it and redistribute it freely, subject
* to the following restrictions:
*
* 1. The author is not responsible for the consequences of use of this
* software, no matter how awful, even if they arise from flaws in it.
*
* 2. The origin of this software must not be misrepresented, either by
* explicit claim or by omission. Since few users ever read sources,
* credits must appear in the documentation.
*
* 3. Altered versions must be plainly marked as such, and must not be
* misrepresented as being the original software. Since few users
* ever read sources, credits must appear in the documentation.
*
* 4. This notice may not be removed or altered.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#ifndef major /* if `major' not defined in types.h, */
#include <sys/sysmacros.h> /* try this one. */
#endif
#ifndef major /* still not defined? give up, manual intervention needed */
/* If cc tries to compile this, read and act on it. */
/* On most systems cpp will discard it automatically */
Congratulations, you have found a portability bug.
Please grep /usr/include/sys and edit the above #include
to point at the file that defines the major macro.
#endif /*major*/
#include <sys/stat.h>
#include "file.h"
#ifndef lint
static char *moduleid =
"@(#)$Header: /cvsroot/src/usr.bin/file/Attic/fsmagic.c,v 1.2 1993/05/19 06:21:23 cgd Exp $";
#endif /* lint */
extern char *progname;
extern char *ckfmsg, *magicfile;
extern int debug;
extern FILE *efopen();
fsmagic(fn)
char *fn;
{
extern struct stat statbuf;
#ifdef S_IFLNK
char slink[PATH_MAX+1];
#endif
/*
* Fstat is cheaper but fails for files you don't have read perms on.
* On 4.2BSD and similar systems, use lstat() so identify symlinks.
*/
#ifdef S_IFLNK
if (lstat(fn, &statbuf) <0)
#else
if (stat(fn, &statbuf) <0)
#endif
{
warning("can't stat", "");
return -1;
}
if (statbuf.st_mode & S_ISUID) ckfputs("setuid ", stdout);
if (statbuf.st_mode & S_ISGID) ckfputs("setgid ", stdout);
if (statbuf.st_mode & S_ISVTX) ckfputs("sticky ", stdout);
switch (statbuf.st_mode & S_IFMT) {
case S_IFDIR:
ckfputs("directory", stdout);
return 1;
case S_IFCHR:
(void) printf("character special (%d/%d)",
major(statbuf.st_rdev), minor(statbuf.st_rdev));
return 1;
case S_IFBLK:
(void) printf("block special (%d/%d)",
major(statbuf.st_rdev), minor(statbuf.st_rdev));
return 1;
/* TODO add code to handle V7 MUX and Blit MUX files */
#ifdef S_IFIFO
case S_IFIFO:
ckfputs("fifo (named pipe)", stdout);
return 1;
#endif
#ifdef S_IFLNK
case S_IFLNK:
ckfputs("symbolic link", stdout);
if (readlink(fn, slink, sizeof(slink)) >= 0) {
ckfputs(" to ", stdout);
ckfputs(slink, stdout);
}
return 1;
#endif
#ifdef S_IFSOCK
case S_IFSOCK:
ckfputs("socket", stdout);
return 1;
#endif
case S_IFREG:
break;
default:
warning("invalid st_mode %d in statbuf!", statbuf.st_mode);
}
/*
* regular file, check next possibility
*/
if (statbuf.st_size == 0) {
ckfputs("empty", stdout);
return 1;
}
return 0;
}