diff options
Diffstat (limited to 'contrib/file/doc/magic.man')
| -rw-r--r-- | contrib/file/doc/magic.man | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/contrib/file/doc/magic.man b/contrib/file/doc/magic.man index f3b63b4..bc37404 100644 --- a/contrib/file/doc/magic.man +++ b/contrib/file/doc/magic.man @@ -1,5 +1,5 @@ -.\" $File: magic.man,v 1.86 2015/09/08 13:48:44 christos Exp $ -.Dd January 1, 2015 +.\" $File: magic.man,v 1.88 2016/07/27 09:42:49 rrt Exp $ +.Dd July 20, 2016 .Dt MAGIC __FSECTION__ .Os .\" install as magic.4 on USG, magic.5 on V7, Berkeley and Linux systems. @@ -535,13 +535,18 @@ the file. The value at that offset is read, and is used again as an offset in the file. Indirect offsets are of the form: -.Em (( x [.[bislBISL]][+\-][ y ]) . +.Em (( x [[.,][bislBISL]][+\-][ y ]) . The value of .Em x is used as an offset in the file. A byte, id3 length, short or long is read at that offset depending on the .Em [bislBISLm] type specifier. +The value is treated as signed if +.Dq , +is specified or unsigned if +.Dq . +is specified. The capitalized types interpret the number as a big endian value, whereas the small letter versions interpret the number as a little endian value; @@ -564,9 +569,9 @@ That way variable length structures can be examined: \*[Gt]\*[Gt](0x3c.l) string LX\e0\e0 LX executable (OS/2) .Ed .Pp -This strategy of examining has a drawback: You must make sure that -you eventually print something, or users may get empty output (like, when -there is neither PE\e0\e0 nor LE\e0\e0 in the above example) +This strategy of examining has a drawback: you must make sure that you +eventually print something, or users may get empty output (such as when +there is neither PE\e0\e0 nor LE\e0\e0 in the above example). .Pp If this indirect offset cannot be used directly, simple calculations are possible: appending |
