file_cmds-82.tar.gz

[apple/file_cmds.git] / file / is_tar.c

diff --git a/file/is_tar.c b/file/is_tar.c
deleted file mode 100644 (file)
index 5efe88c..0000000
--- a/file/is_tar.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
- * Reserved.  This file contains Original Code and/or Modifications of
- * Original Code as defined in and that are subject to the Apple Public
- * Source License Version 1.1 (the "License").  You may not use this file
- * except in compliance with the License.  Please obtain a copy of the
- * License at http://www.apple.com/publicsource and read it before using
- * this file.
- * 
- * The Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- * 
- * @APPLE_LICENSE_HEADER_END@
- */
-/*     $OpenBSD: is_tar.c,v 1.3 1997/02/09 23:58:27 millert Exp $      */
-
-/*
- * is_tar() -- figure out whether file is a tar archive.
- *
- * Stolen (by the author!) from the public domain tar program:
- * Pubic Domain version written 26 Aug 1985 John Gilmore (ihnp4!hoptoad!gnu).
- *
- * @(#)list.c 1.18 9/23/86 Public Domain - gnu
- *
- * Comments changed and some code/comments reformatted
- * for file command by Ian Darwin.
- */
-
-#include <string.h>
-#include <ctype.h>
-#include <sys/types.h>
-#include "tar.h"
-
-#define        isodigit(c)     ( ((c) >= '0') && ((c) <= '7') )
-
-#if    defined(__STDC__) || defined(__cplusplus)
-static int from_oct(int, char*);       /* Decode octal number */
-#else
-static int from_oct();
-#endif
-
-/*
- * Return 
- *     0 if the checksum is bad (i.e., probably not a tar archive), 
- *     1 for old UNIX tar file,
- *     2 for Unix Std (POSIX) tar file.
- */
-int
-is_tar(buf, nbytes)
-unsigned char *buf;
-int nbytes;
-{
-       register union record *header = (union record *)buf;
-       register int    i;
-       register int    sum, recsum;
-       register char   *p;
-
-       if (nbytes < sizeof(union record))
-               return 0;
-
-       recsum = from_oct(8,  header->header.chksum);
-
-       sum = 0;
-       p = header->charptr;
-       for (i = sizeof(union record); --i >= 0;) {
-               /*
-                * We can't use unsigned char here because of old compilers,
-                * e.g. V7.
-                */
-               sum += 0xFF & *p++;
-       }
-
-       /* Adjust checksum to count the "chksum" field as blanks. */
-       for (i = sizeof(header->header.chksum); --i >= 0;)
-               sum -= 0xFF & header->header.chksum[i];
-       sum += ' '* sizeof header->header.chksum;       
-
-       if (sum != recsum)
-               return 0;       /* Not a tar archive */
-       
-       if (0==strcmp(header->header.magic, TMAGIC)) 
-               return 2;               /* Unix Standard tar archive */
-
-       return 1;                       /* Old fashioned tar archive */
-}
-
-
-/*
- * Quick and dirty octal conversion.
- *
- * Result is -1 if the field is invalid (all blank, or nonoctal).
- */
-static int
-from_oct(digs, where)
-       register int    digs;
-       register char   *where;
-{
-       register int    value;
-
-       while (isspace(*where)) {               /* Skip spaces */
-               where++;
-               if (--digs <= 0)
-                       return -1;              /* All blank field */
-       }
-       value = 0;
-       while (digs > 0 && isodigit(*where)) {  /* Scan til nonoctal */
-               value = (value << 3) | (*where++ - '0');
-               --digs;
-       }
-
-       if (digs > 0 && *where && !isspace(*where))
-               return -1;                      /* Ended on non-space/nul */
-
-       return value;
-}