usr.bin/file/file.h

/*
 * file.h - definitions for file(1) program
 * @(#)file.h,v 1.2 1993/06/10 00:38:09 jtc Exp
 *
 * 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.
 */

#define HOWMANY 1024            /* how much of the file to look at */
#define MAXMAGIS 1000           /* max entries in /etc/magic */
#define MAXDESC 50              /* max leng of text description */
#define MAXstring 32            /* max leng of "string" types */

struct magic {
        short flag;
#define INDIR   1               /* if '>(...)' appears,  */
        short cont_level;       /* level of ">" */
        struct {
                char type;      /* byte short long */
                long offset;    /* offset from indirection */
        } in;
        long offset;            /* offset to magic number */
#define MASK    0200            /* this is a masked op, like & v1 = v2 */
        unsigned char reln;     /* relation (0=eq, '>'=gt, etc) */
        char type;              /* int, short, long or string. */
        char vallen;            /* length of string value, if any */
#define                         BYTE    1
#define                         SHORT   2
#define                         LONG    4
#define                         STRING  5
#define                         DATE    6
#define                         BESHORT 7
#define                         BELONG  8
#define                         BEDATE  9
#define                         LESHORT 10
#define                         LELONG  11
#define                         LEDATE  12
        union VALUETYPE {
                char b;
                short h;
                long l;
                char s[MAXstring];
                unsigned char hs[2];    /* 2 bytes of a fixed-endian "short" */
                unsigned char hl[4];    /* 2 bytes of a fixed-endian "long" */
        } value;                /* either number or string */
        long mask;              /* mask before comparison with value */
        char nospflag;          /* supress space character */
        char desc[MAXDESC];     /* description */
};

#include <stdio.h>      /* Include that here, to make sure __P gets defined */

#ifndef __P
# if __STDC__ || __cplusplus
#  define __P(a) a
# else
#  define __P(a) ()
#  define const
# endif
#endif

extern int   apprentice         __P((char *, int));
extern int   ascmagic           __P((unsigned char *, int));
extern void  error              __P((const char *, ...));
extern void  ckfputs            __P((const char *, FILE *));
struct stat;
extern int   fsmagic            __P((const char *, struct stat *));
extern int   is_compress        __P((const unsigned char *, int *));
extern int   is_tar             __P((unsigned char *));
extern void  magwarn            __P((const char *, ...));
extern void  mdump              __P((struct magic *));
extern void  process            __P((const char *, int));
extern void  showstr            __P((const char *));
extern int   softmagic          __P((unsigned char *, int));
extern void  tryit              __P((unsigned char *, int));
extern int   uncompress         __P((const unsigned char *, unsigned char **, int));
extern void  ckfprintf          __P((FILE *, const char *, ...));


extern int errno;               /* Some unixes don't define this..      */

extern char *progname;          /* the program name                     */
extern char *magicfile;         /* name of the magic file               */
extern int lineno;              /* current line number in magic file    */

extern struct magic *magic;     /* array of magic entries               */
extern int nmagic;              /* number of valid magic[]s             */


extern int debug;               /* enable debugging?                    */
extern int zflag;               /* process compressed files?            */
extern int lflag;               /* follow symbolic links?               */

extern int optind;              /* From getopt(3)                       */
extern char *optarg;

#if !defined(__STDC__) || defined(sun)
extern int sys_nerr;
extern char *sys_errlist[];
#define strerror(e) \
        (((e) >= 0 && (e) < sys_nerr) ? sys_errlist[(e)] : "Unknown error")
#endif

#ifndef MAXPATHLEN
#define MAXPATHLEN      512
#endif